def __init__(
self,
host: str,
port: int,
privkey: bytes,
nonce_update_interval: float = 5.0,
nonce_offset: int = 0):
endpoint = 'http://{}:{}'.format(host, port)
session = requests.Session()
adapter = requests.adapters.HTTPAdapter(pool_maxsize=50)
session.mount(endpoint, adapter)
self.transport = HttpPostClientTransport(
endpoint,
post_method=session.post,
headers={'content-type': 'application/json'},
)
self.port = port
self.privkey = privkey
self.protocol = JSONRPCProtocol()
self.sender = privatekey_to_address(privkey)
# Needs to be initialized to None in the beginning since JSONRPCClient
# gets constructed before the RaidenService Object.
self.stop_event = None
self.nonce_last_update = 0
self.nonce_current_value = None
self.nonce_lock = Semaphore()
self.nonce_update_interval = nonce_update_interval
self.nonce_offset = nonce_offset
class JSONRPCClient(object):
protocol = JSONRPCProtocol()
def __init__(self, port=4000, print_communication=True):
self.transport = HttpPostClientTransport('http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
def call(self, method, *args, **kwargs):
request = self.protocol.create_request(method, args, kwargs)
reply = self.transport.send_message(request.serialize())
if self.print_communication:
print "Request:"
print json.dumps(json.loads(request.serialize()), indent=2)
print "Reply:"
print reply
return self.protocol.parse_reply(reply).result
__call__ = call
def find_block(self, condition):
"""Query all blocks one by one and return the first one for which
`condition(block)` evaluates to `True`.
"""
i = 0
while True:
block = self.call('eth_getBlockByNumber', quantity_encoder(i), True, print_comm=False)
if condition(block):
return block
i += 1
def eth_sendTransaction(self, nonce=None, sender='', to='', value=0, data='',
gasprice=default_gasprice, startgas=default_startgas,
v=None, r=None, s=None):
encoders = dict(nonce=quantity_encoder, sender=address_encoder, to=data_encoder,
value=quantity_encoder, gasprice=quantity_encoder,
startgas=quantity_encoder, data=data_encoder,
v=quantity_encoder, r=quantity_encoder, s=quantity_encoder)
data = {k: encoders[k](v) for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None}
data['from'] = data.pop('sender')
assert data.get('from') or (v and r and s)
res = self.call('eth_sendTransaction', data)
return data_decoder(res)
def __init__(self, zmq_context, source, destination, n_bytes):
threading.Thread.__init__(self)
self.key = "SENDER%i" % Sender.count
Sender.count += 1
self.subscriber = zmq_context.socket(zmq.SUB)
self.subscriber.connect("tcp://%s:5500" % HOST)
self.subscriber.setsockopt(zmq.SUBSCRIBE, self.key)
rpc_client = RPCClient(
JSONRPCProtocol(),
HttpPostClientTransport("http://%s:5501" % HOST))
self.remote_server = rpc_client.get_proxy()
self.source = source
self.destination = destination
self.n_bytes = n_bytes
self.result = ""
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(JSONRPCProtocol(),
HttpPostClientTransport('http://127.0.0.1:10090/'))
remote_server = rpc_client.get_proxy()
# call a method called 'reverse_string' with a single string argument
msgs = [{
"topic": "tA",
"params": {}
}, {
"topic": "huh",
"params": {}
}, {
"topic": "/tf",
"params": {
"frame_id": "World",
"child_frame_id": "Robot",
"x": "10.0",
"y": "2",
"z": "3",
"qx": "0.0",
"qy": "0.7",
"qz": "-0.7",
"qw": "0.01"
}
}, {
"topic": "/tf",
def __init__(self, obj, wrap_exceptions=True, one_way=False):
url = obj.env['device_manager.settings']._get_param(
'mqtt_rpc_bridge_url')
logger.debug('HTTP bridge url {}'.format(url))
rpc_client = RPCClient(JSONRPCProtocol(), HttpPostClientTransport(url))
self.proxy = rpc_client.get_proxy(one_way=one_way)
class JSONRPCClient:
""" Ethereum JSON RPC client.
Args:
host: Ethereum node host address.
port: Ethereum node port number.
privkey: Local user private key, used to sign transactions.
nonce_update_interval: Update the account nonce every
`nonce_update_interval` seconds.
nonce_offset: Network's default base nonce number.
"""
def __init__(self,
host: str,
port: int,
privkey: bytes,
gasprice: int = None,
nonce_update_interval: float = 5.0,
nonce_offset: int = 0):
if privkey is None or len(privkey) != 32:
raise ValueError('Invalid private key')
endpoint = 'http://{}:{}'.format(host, port)
self.session = requests.Session()
adapter = requests.adapters.HTTPAdapter(pool_maxsize=50)
self.session.mount(endpoint, adapter)
self.transport = HttpPostClientTransport(
endpoint,
post_method=self.session.post,
headers={'content-type': 'application/json'},
)
self.port = port
self.privkey = privkey
self.protocol = JSONRPCProtocol()
self.sender = privatekey_to_address(privkey)
# Needs to be initialized to None in the beginning since JSONRPCClient
# gets constructed before the RaidenService Object.
self.stop_event = None
self.nonce_last_update = 0
self.nonce_available_value = None
self.nonce_lock = Semaphore()
self.nonce_update_interval = nonce_update_interval
self.nonce_offset = nonce_offset
self.given_gas_price = gasprice
cache = cachetools.TTLCache(
maxsize=1,
ttl=RPC_CACHE_TTL,
)
cache_wrapper = cachetools.cached(cache=cache)
self.gaslimit = cache_wrapper(self._gaslimit)
cache = cachetools.TTLCache(
maxsize=1,
ttl=RPC_CACHE_TTL,
)
cache_wrapper = cachetools.cached(cache=cache)
self.gasprice = cache_wrapper(self._gasprice)
def __del__(self):
self.session.close()
def __repr__(self):
return '<JSONRPCClient @%d>' % self.port
def block_number(self):
""" Return the most recent block. """
return quantity_decoder(self.rpccall_with_retry('eth_blockNumber'))
def nonce_needs_update(self):
if self.nonce_available_value is None:
return True
now = time.time()
# Python's 2.7 time is not monotonic and it's affected by clock resets,
# force an update.
if self.nonce_last_update > now:
return True
return now - self.nonce_last_update > self.nonce_update_interval
def nonce_update_from_node(self):
nonce = -2
nonce_available_value = self.nonce_available_value or -1
# Wait until all tx are registered as pending
while nonce < nonce_available_value:
pending_transactions_hex = self.rpccall_with_retry(
'eth_getTransactionCount',
address_encoder(self.sender),
'pending',
)
pending_transactions = quantity_decoder(pending_transactions_hex)
nonce = pending_transactions + self.nonce_offset
log.debug(
'updated nonce from server',
server=nonce,
local=nonce_available_value,
)
self.nonce_last_update = time.time()
self.nonce_available_value = nonce
def nonce(self):
with self.nonce_lock:
if self.nonce_needs_update():
self.nonce_update_from_node()
self.nonce_available_value += 1
return self.nonce_available_value - 1
def inject_stop_event(self, event):
self.stop_event = event
def balance(self, account: Address):
""" Return the balance of the account of given address. """
res = self.rpccall_with_retry('eth_getBalance',
address_encoder(account), 'pending')
return quantity_decoder(res)
def _gaslimit(self, location='pending') -> int:
last_block = self.rpccall_with_retry('eth_getBlockByNumber', location,
True)
gas_limit = quantity_decoder(last_block['gasLimit'])
return gas_limit * 8 // 10
def _gasprice(self) -> int:
if self.given_gas_price:
return self.given_gas_price
gas_price = self.rpccall_with_retry('eth_gasPrice')
return quantity_decoder(gas_price)
def check_startgas(self, startgas):
if not startgas:
return self.gaslimit()
return startgas
def new_contract_proxy(self, contract_interface,
contract_address: Address):
""" Return a proxy for interacting with a smart contract.
Args:
contract_interface: The contract interface as defined by the json.
address: The contract's address.
"""
return ContractProxy(
self.sender,
contract_interface,
contract_address,
self.eth_call,
self.send_transaction,
self.eth_estimateGas,
)
def deploy_solidity_contract(
self, # pylint: disable=too-many-locals
contract_name,
all_contracts,
libraries,
constructor_parameters,
contract_path=None,
timeout=None):
"""
Deploy a solidity contract.
Args:
sender (address): the sender address
contract_name (str): the name of the contract to compile
all_contracts (dict): the json dictionary containing the result of compiling a file
libraries (list): A list of libraries to use in deployment
constructor_parameters (tuple): A tuple of arguments to pass to the constructor
contract_path (str): If we are dealing with solc >= v0.4.9 then the path
to the contract is a required argument to extract
the contract data from the `all_contracts` dict.
timeout (int): Amount of time to poll the chain to confirm deployment
"""
if contract_name in all_contracts:
contract_key = contract_name
elif contract_path is not None:
_, filename = os.path.split(contract_path)
contract_key = filename + ':' + contract_name
if contract_key not in all_contracts:
raise ValueError('Unknown contract {}'.format(contract_name))
else:
raise ValueError(
'Unknown contract {} and no contract_path given'.format(
contract_name))
libraries = dict(libraries)
contract = all_contracts[contract_key]
contract_interface = contract['abi']
symbols = solidity_unresolved_symbols(contract['bin_hex'])
if symbols:
available_symbols = list(
map(solidity_library_symbol, all_contracts.keys()))
unknown_symbols = set(symbols) - set(available_symbols)
if unknown_symbols:
msg = 'Cannot deploy contract, known symbols {}, unresolved symbols {}.'.format(
available_symbols,
unknown_symbols,
)
raise Exception(msg)
dependencies = deploy_dependencies_symbols(all_contracts)
deployment_order = dependencies_order_of_build(
contract_key, dependencies)
deployment_order.pop() # remove `contract_name` from the list
log.debug('Deploying dependencies: {}'.format(
str(deployment_order)))
for deploy_contract in deployment_order:
dependency_contract = all_contracts[deploy_contract]
hex_bytecode = solidity_resolve_symbols(
dependency_contract['bin_hex'], libraries)
bytecode = unhexlify(hex_bytecode)
dependency_contract['bin_hex'] = hex_bytecode
dependency_contract['bin'] = bytecode
transaction_hash_hex = self.send_transaction(
to=b'',
data=bytecode,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
# remove the hexadecimal prefix 0x from the address
contract_address = contract_address[2:]
libraries[deploy_contract] = contract_address
deployed_code = self.eth_getCode(
address_decoder(contract_address))
if not deployed_code:
raise RuntimeError(
'Contract address has no code, check gas usage.')
hex_bytecode = solidity_resolve_symbols(contract['bin_hex'],
libraries)
bytecode = unhexlify(hex_bytecode)
contract['bin_hex'] = hex_bytecode
contract['bin'] = bytecode
if constructor_parameters:
translator = ContractTranslator(contract_interface)
parameters = translator.encode_constructor_arguments(
constructor_parameters)
bytecode = contract['bin'] + parameters
else:
bytecode = contract['bin']
transaction_hash_hex = self.send_transaction(
to=b'',
data=bytecode,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
deployed_code = self.eth_getCode(address_decoder(contract_address))
if not deployed_code:
raise RuntimeError(
'Deployment of {} failed. Contract address has no code, check gas usage.'
.format(contract_name, ))
return self.new_contract_proxy(
contract_interface,
contract_address,
)
def new_filter(self,
fromBlock=None,
toBlock=None,
address=None,
topics=None):
""" Creates a filter object, based on filter options, to notify when
the state changes (logs). To check if the state has changed, call
eth_getFilterChanges.
"""
json_data = {
'fromBlock': block_tag_encoder(fromBlock or ''),
'toBlock': block_tag_encoder(toBlock or ''),
}
if address is not None:
json_data['address'] = address_encoder(address)
if topics is not None:
if not isinstance(topics, list):
raise ValueError('topics must be a list')
json_data['topics'] = [topic_encoder(topic) for topic in topics]
filter_id = self.rpccall_with_retry('eth_newFilter', json_data)
return quantity_decoder(filter_id)
def filter_changes(self, fid: int) -> List:
changes = self.rpccall_with_retry('eth_getFilterChanges',
quantity_encoder(fid))
if not changes:
return list()
assert isinstance(changes, list)
decoders = {
'blockHash': data_decoder,
'transactionHash': data_decoder,
'data': data_decoder,
'address': address_decoder,
'topics': lambda x: [topic_decoder(t) for t in x],
'blockNumber': quantity_decoder,
'logIndex': quantity_decoder,
'transactionIndex': quantity_decoder
}
return [{k: decoders[k](v)
for k, v in c.items() if v is not None} for c in changes]
def rpccall_with_retry(self, method: str, *args):
""" Do the request and return the result.
Args:
method: The JSON-RPC method.
args: The encoded arguments expected by the method.
- Object arguments must be supplied as a dictionary.
- Quantity arguments must be hex encoded starting with '0x' and
without left zeros.
- Data arguments must be hex encoded starting with '0x'
"""
request = self.protocol.create_request(method, args)
request_serialized = request.serialize().encode()
for i, timeout in enumerate(timeout_two_stage(10, 3, 10)):
if self.stop_event and self.stop_event.is_set():
raise RaidenShuttingDown()
try:
reply = self.transport.send_message(request_serialized)
except (requests.exceptions.ConnectionError, InvalidReplyError):
log.info(
'Timeout in eth client connection to {}. Is the client offline? Trying '
'again in {}s.'.format(self.transport.endpoint, timeout))
else:
if self.stop_event and self.stop_event.is_set():
raise RaidenShuttingDown()
if i > 0:
log.info('Client reconnected')
jsonrpc_reply = self.protocol.parse_reply(reply)
if isinstance(jsonrpc_reply, JSONRPCSuccessResponse):
return jsonrpc_reply.result
elif isinstance(jsonrpc_reply, JSONRPCErrorResponse):
raise EthNodeCommunicationError(
jsonrpc_reply.error,
jsonrpc_reply._jsonrpc_error_code, # pylint: disable=protected-access
)
else:
raise EthNodeCommunicationError(
'Unknown type of JSONRPC reply')
gevent.sleep(timeout)
def send_transaction(
self,
to: Address,
value: int = 0,
data: bytes = b'',
startgas: int = None,
):
""" Helper to send signed messages.
This method will use the `privkey` provided in the constructor to
locally sign the transaction. This requires an extended server
implementation that accepts the variables v, r, and s.
"""
if to == b'' and data.isalnum():
warnings.warn(
'Verify that the data parameter is _not_ hex encoded, if this is the case '
'the data will be double encoded and result in unexpected '
'behavior.')
if to == b'0' * 40:
warnings.warn(
'For contract creation the empty string must be used.')
nonce = self.nonce()
startgas = self.check_startgas(startgas)
tx = Transaction(
nonce,
self.gasprice(),
startgas,
to=to,
value=value,
data=data,
)
tx.sign(self.privkey)
result = self.rpccall_with_retry(
'eth_sendRawTransaction',
data_encoder(rlp.encode(tx)),
)
return result[2 if result.startswith('0x') else 0:]
def eth_call(self,
sender: Address = b'',
to: Address = b'',
value: int = 0,
data: bytes = b'',
startgas: int = None,
block_number: Union[str, int] = 'latest') -> bytes:
""" Executes a new message call immediately without creating a
transaction on the blockchain.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas: Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice: gasPrice used for unit of gas paid.
value: Integer of the value sent with this transaction.
data: Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
startgas = self.check_startgas(startgas)
json_data = format_data_for_rpccall(
sender,
to,
value,
data,
startgas,
self.gasprice(),
)
res = self.rpccall_with_retry('eth_call', json_data, block_number)
return data_decoder(res)
def eth_estimateGas(self,
sender: Address = b'',
to: Address = b'',
value: int = 0,
data: bytes = b'',
startgas: int = None) -> Optional[int]:
""" Makes a call or transaction, which won't be added to the blockchain
and returns the used gas, which can be used for estimating the used
gas.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas: Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
value: Integer of the value sent with this transaction.
data: Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
startgas = self.check_startgas(startgas)
json_data = format_data_for_rpccall(sender, to, value, data, startgas)
try:
res = self.rpccall_with_retry('eth_estimateGas', json_data)
except EthNodeCommunicationError as e:
tx_would_fail = e.error_code and e.error_code in (-32015, -32000)
if tx_would_fail: # -32015 is parity and -32000 is geth
return None
else:
raise e
return quantity_decoder(res)
def eth_getTransactionReceipt(self, transaction_hash: bytes) -> Dict:
""" Returns the receipt of a transaction by transaction hash.
Args:
transaction_hash: Hash of a transaction.
Returns:
A dict representing the transaction receipt object, or null when no
receipt was found.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
return self.rpccall_with_retry('eth_getTransactionReceipt',
transaction_hash)
def eth_getCode(self,
code_address: Address,
block: Union[int, str] = 'latest') -> bytes:
""" Returns code at a given address.
Args:
code_address: An address.
block: Integer block number, or the string 'latest',
'earliest' or 'pending'. Default is 'latest'.
"""
if code_address.startswith(b'0x'):
warnings.warn(
'address seems to be already encoded, this will result '
'in unexpected behavior')
if len(code_address) != 20:
raise ValueError(
'address length must be 20 (it might be hex encoded)')
result = self.rpccall_with_retry('eth_getCode',
address_encoder(code_address), block)
return data_decoder(result)
def eth_getTransactionByHash(self, transaction_hash: bytes):
""" Returns the information about a transaction requested by
transaction hash.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
return self.rpccall_with_retry('eth_getTransactionByHash',
transaction_hash)
def poll(self,
transaction_hash: bytes,
confirmations: int = None,
timeout: float = None):
""" Wait until the `transaction_hash` is applied or rejected.
If timeout is None, this could wait indefinitely!
Args:
transaction_hash: Transaction hash that we are waiting for.
confirmations: Number of block confirmations that we will
wait for.
timeout: Timeout in seconds, raise an Excpetion on timeout.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
deadline = None
if timeout:
deadline = gevent.Timeout(timeout)
deadline.start()
try:
# used to check if the transaction was removed, this could happen
# if gas price is too low:
#
# > Transaction (acbca3d6) below gas price (tx=1 Wei ask=18
# > Shannon). All sequential txs from this address(7d0eae79)
# > will be ignored
#
last_result = None
while True:
# Could return None for a short period of time, until the
# transaction is added to the pool
transaction = self.rpccall_with_retry(
'eth_getTransactionByHash',
transaction_hash,
)
# if the transaction was added to the pool and then removed
if transaction is None and last_result is not None:
raise Exception('invalid transaction, check gas price')
# the transaction was added to the pool and mined
if transaction and transaction['blockNumber'] is not None:
break
last_result = transaction
gevent.sleep(.5)
if confirmations:
# this will wait for both APPLIED and REVERTED transactions
transaction_block = quantity_decoder(
transaction['blockNumber'])
confirmation_block = transaction_block + confirmations
block_number = self.block_number()
while block_number < confirmation_block:
gevent.sleep(.5)
block_number = self.block_number()
except gevent.Timeout:
raise Exception('timeout when polling for transaction')
finally:
if deadline:
deadline.cancel()
def non_sessioned_client():
client = HttpPostClientTransport('http://%s:%d' % TEST_SERVER_ADDR)
return client
class JSONRPCClient(object):
protocol = JSONRPCProtocol()
def __init__(self,
port=4000,
print_communication=True,
privkey=None,
sender=None):
"specify privkey for local signing"
self.transport = HttpPostClientTransport(
'http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
self.privkey = privkey
self._sender = sender
@property
def sender(self):
if self.privkey:
return privtoaddr(self.privkey)
if self._sender is None:
self._sender = self.coinbase
return self._sender
def call(self, method, *args):
request = self.protocol.create_request(method, args)
reply = self.transport.send_message(request.serialize())
if self.print_communication:
print json.dumps(json.loads(request.serialize()), indent=2)
print reply
return self.protocol.parse_reply(reply).result
__call__ = call
def find_block(self, condition):
"""Query all blocks one by one and return the first one for which
`condition(block)` evaluates to `True`.
"""
i = 0
while True:
block = self.call('eth_getBlockByNumber', quantity_encoder(i),
True)
if condition(block):
return block
i += 1
return None
def new_filter(self, fromBlock="", toBlock="", address=None, topics=[]):
encoders = dict(fromBlock=block_tag_encoder,
toBlock=block_tag_encoder,
address=address_encoder,
topics=lambda x: [topic_encoder(t) for t in x])
data = {
k: encoders[k](v)
for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None
}
fid = self.call('eth_newFilter', data)
return quantity_decoder(fid)
def filter_changes(self, fid):
changes = self.call('eth_getFilterChanges', quantity_encoder(fid))
if not changes:
return None
elif isinstance(changes, bytes):
return data_decoder(changes)
else:
decoders = dict(blockHash=data_decoder,
transactionHash=data_decoder,
data=data_decoder,
address=address_decoder,
topics=lambda x: [topic_decoder(t) for t in x],
blockNumber=quantity_decoder,
logIndex=quantity_decoder,
transactionIndex=quantity_decoder)
return [{k: decoders[k](v)
for k, v in c.items() if v is not None} for c in changes]
def eth_sendTransaction(self,
nonce=None,
sender='',
to='',
value=0,
data='',
gasPrice=default_gasprice,
gas=default_startgas,
v=None,
r=None,
s=None,
secret=None):
to = address20(to)
encoders = dict(nonce=quantity_encoder,
sender=address_encoder,
to=data_encoder,
value=quantity_encoder,
gasPrice=quantity_encoder,
gas=quantity_encoder,
data=data_encoder,
v=quantity_encoder,
r=quantity_encoder,
s=quantity_encoder,
secret=secret_encoder)
data = {
k: encoders[k](v)
for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None
}
data['from'] = data.pop('sender')
assert data.get('from') or (v and r and s)
res = self.call('eth_sendTransaction', data)
return data_decoder(res)
def eth_call(self,
sender='',
to='',
value=0,
data='',
startgas=default_startgas,
gasprice=default_gasprice):
"call on pending block"
encoders = dict(sender=address_encoder,
to=data_encoder,
value=quantity_encoder,
gasprice=quantity_encoder,
startgas=quantity_encoder,
data=data_encoder)
data = {
k: encoders[k](v)
for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None
}
for k, v in dict(gasprice='gasPrice', startgas='gas',
sender='from').items():
data[v] = data.pop(k)
res = self.call('eth_call', data)
return data_decoder(res)
def blocknumber(self):
return quantity_decoder(self.call('eth_blockNumber'))
def nonce(self, address):
if len(address) == 40:
address = address.decode('hex')
return quantity_decoder(
self.call('eth_getTransactionCount', address_encoder(address),
'pending'))
@property
def coinbase(self):
return address_decoder(self.call('eth_coinbase'))
def balance(self, account):
b = quantity_decoder(
self.call('eth_getBalance', address_encoder(account), 'pending'))
return b
def gaslimit(self):
return quantity_decoder(self.call('eth_gasLimit'))
def lastgasprice(self):
return quantity_decoder(self.call('eth_lastGasPrice'))
def send_transaction(self,
sender,
to,
value=0,
data='',
startgas=0,
gasprice=10 * denoms.szabo):
"can send a locally signed transaction if privkey is given"
assert self.privkey or sender
if self.privkey:
_sender = sender
sender = privtoaddr(self.privkey)
assert sender == _sender
assert sender
# fetch nonce
nonce = self.nonce(sender)
if not startgas:
startgas = quantity_decoder(self.call('eth_gasLimit')) - 1
# create transaction
tx = Transaction(nonce,
gasprice,
startgas,
to=to,
value=value,
data=data)
if self.privkey:
tx.sign(self.privkey)
tx_dict = tx.to_dict()
tx_dict.pop('hash')
for k, v in dict(gasprice='gasPrice', startgas='gas').items():
tx_dict[v] = tx_dict.pop(k)
tx_dict['sender'] = sender
res = self.eth_sendTransaction(**tx_dict)
assert len(res) in (20, 32)
return res.encode('hex')
def new_abi_contract(self, _abi, address):
sender = self.sender or privtoaddr(self.privkey)
return ABIContract(sender, _abi, address, self.eth_call,
self.send_transaction)
#!/usr/bin/python
#
# pip install tinyrpc
#
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(JSONRPCProtocol(),
HttpPostClientTransport('http://localhost:8080/'))
local = rpc_client.get_proxy()
s = ' This is a message '
stripped = local.strip(str=s)
assert stripped == s.strip()
print 'rpc ok'
import sys
sys.exit(0)
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
import time
import sys
rpc_client = RPCClient(JSONRPCProtocol(),
HttpPostClientTransport('http://192.168.1.100:8080/'))
remote_server = rpc_client.get_proxy()
try:
vhf_data_rate = None
uhf_data_rate = None
sat_comm_data_rate = None
while True:
time.sleep(2)
vhf_data_rate_json = remote_server.get_vhf_data_rate()
vhf_data_rate = vhf_data_rate_json['vhf_rate']
uhf_data_rate_json = remote_server.get_uhf_data_rate()
uhf_data_rate = uhf_data_rate_json['uhf_rate']
sat_comm_data_rate_json = remote_server.get_sat_comm_data_rate()
sat_comm_data_rate = sat_comm_data_rate_json['satcomm_rate']
print("\n\n\nCurrent VHF data rate is: ", vhf_data_rate)
print("\n\n\nCurrent UHF data rate is: ", uhf_data_rate)
print("\n\n\nCurrent SatComm data rate is: ", sat_comm_data_rate)
except KeyboardInterrupt:
class JSONRPCClient:
""" Ethereum JSON RPC client.
Args:
host: Ethereum node host address.
port: Ethereum node port number.
privkey: Local user private key, used to sign transactions.
nonce_update_interval: Update the account nonce every
`nonce_update_interval` seconds.
nonce_offset: Network's default base nonce number.
"""
def __init__(
self,
host: str,
port: int,
privkey: bytes,
nonce_update_interval: float = 5.0,
nonce_offset: int = 0):
endpoint = 'http://{}:{}'.format(host, port)
session = requests.Session()
adapter = requests.adapters.HTTPAdapter(pool_maxsize=50)
session.mount(endpoint, adapter)
self.transport = HttpPostClientTransport(
endpoint,
post_method=session.post,
headers={'content-type': 'application/json'},
)
self.port = port
self.privkey = privkey
self.protocol = JSONRPCProtocol()
self.sender = privatekey_to_address(privkey)
# Needs to be initialized to None in the beginning since JSONRPCClient
# gets constructed before the RaidenService Object.
self.stop_event = None
self.nonce_last_update = 0
self.nonce_current_value = None
self.nonce_lock = Semaphore()
self.nonce_update_interval = nonce_update_interval
self.nonce_offset = nonce_offset
def __repr__(self):
return '<JSONRPCClient @%d>' % self.port
def block_number(self):
""" Return the most recent block. """
return quantity_decoder(self.call('eth_blockNumber'))
def nonce(self, address):
if len(address) == 40:
address = unhexlify(address)
with self.nonce_lock:
initialized = self.nonce_current_value is not None
query_time = now()
if self.nonce_last_update > query_time:
# Python's 2.7 time is not monotonic and it's affected by clock
# resets, force an update.
self.nonce_update_interval = query_time - self.nonce_update_interval
needs_update = True
else:
last_update_interval = query_time - self.nonce_last_update
needs_update = last_update_interval > self.nonce_update_interval
if initialized and not needs_update:
self.nonce_current_value += 1
return self.nonce_current_value
pending_transactions_hex = self.call(
'eth_getTransactionCount',
address_encoder(address),
'pending',
)
pending_transactions = quantity_decoder(pending_transactions_hex)
nonce = pending_transactions + self.nonce_offset
# we may have hammered the server and not all tx are
# registered as `pending` yet
if initialized:
while nonce < self.nonce_current_value:
log.debug(
'nonce on server too low; retrying',
server=nonce,
local=self.nonce_current_value,
)
query_time = now()
pending_transactions_hex = self.call(
'eth_getTransactionCount',
address_encoder(address),
'pending',
)
pending_transactions = quantity_decoder(pending_transactions_hex)
nonce = pending_transactions + self.nonce_offset
self.nonce_current_value = nonce
self.nonce_last_update = query_time
return self.nonce_current_value
def inject_stop_event(self, event):
self.stop_event = event
def balance(self, account: address):
""" Return the balance of the account of given address. """
res = self.call('eth_getBalance', address_encoder(account), 'pending')
return quantity_decoder(res)
def gaslimit(self) -> int:
last_block = self.call('eth_getBlockByNumber', 'latest', True)
gas_limit = quantity_decoder(last_block['gasLimit'])
return gas_limit
def new_contract_proxy(self, contract_interface, contract_address: address):
""" Return a proxy for interacting with a smart contract.
Args:
contract_interface: The contract interface as defined by the json.
address: The contract's address.
"""
return ContractProxy(
self.sender,
contract_interface,
contract_address,
self.eth_call,
self.send_transaction,
self.eth_estimateGas,
)
def deploy_solidity_contract(
self, # pylint: disable=too-many-locals
sender,
contract_name,
all_contracts,
libraries,
constructor_parameters,
contract_path=None,
timeout=None,
gasprice=GAS_PRICE):
"""
Deploy a solidity contract.
Args:
sender (address): the sender address
contract_name (str): the name of the contract to compile
all_contracts (dict): the json dictionary containing the result of compiling a file
libraries (list): A list of libraries to use in deployment
constructor_parameters (tuple): A tuple of arguments to pass to the constructor
contract_path (str): If we are dealing with solc >= v0.4.9 then the path
to the contract is a required argument to extract
the contract data from the `all_contracts` dict.
timeout (int): Amount of time to poll the chain to confirm deployment
gasprice: The gasprice to provide for the transaction
"""
if contract_name in all_contracts:
contract_key = contract_name
elif contract_path is not None:
_, filename = os.path.split(contract_path)
contract_key = filename + ':' + contract_name
if contract_key not in all_contracts:
raise ValueError('Unknown contract {}'.format(contract_name))
else:
raise ValueError(
'Unknown contract {} and no contract_path given'.format(contract_name)
)
libraries = dict(libraries)
contract = all_contracts[contract_key]
contract_interface = contract['abi']
symbols = solidity_unresolved_symbols(contract['bin_hex'])
if symbols:
available_symbols = list(map(solidity_library_symbol, all_contracts.keys()))
unknown_symbols = set(symbols) - set(available_symbols)
if unknown_symbols:
msg = 'Cannot deploy contract, known symbols {}, unresolved symbols {}.'.format(
available_symbols,
unknown_symbols,
)
raise Exception(msg)
dependencies = deploy_dependencies_symbols(all_contracts)
deployment_order = dependencies_order_of_build(contract_key, dependencies)
deployment_order.pop() # remove `contract_name` from the list
log.debug('Deploying dependencies: {}'.format(str(deployment_order)))
for deploy_contract in deployment_order:
dependency_contract = all_contracts[deploy_contract]
hex_bytecode = solidity_resolve_symbols(dependency_contract['bin_hex'], libraries)
bytecode = unhexlify(hex_bytecode)
dependency_contract['bin_hex'] = hex_bytecode
dependency_contract['bin'] = bytecode
transaction_hash_hex = self.send_transaction(
sender,
to=b'',
data=bytecode,
gasprice=gasprice,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
# remove the hexadecimal prefix 0x from the address
contract_address = contract_address[2:]
libraries[deploy_contract] = contract_address
deployed_code = self.eth_getCode(address_decoder(contract_address))
if len(deployed_code) == 0:
raise RuntimeError('Contract address has no code, check gas usage.')
hex_bytecode = solidity_resolve_symbols(contract['bin_hex'], libraries)
bytecode = unhexlify(hex_bytecode)
contract['bin_hex'] = hex_bytecode
contract['bin'] = bytecode
if constructor_parameters:
translator = ContractTranslator(contract_interface)
parameters = translator.encode_constructor_arguments(constructor_parameters)
bytecode = contract['bin'] + parameters
else:
bytecode = contract['bin']
transaction_hash_hex = self.send_transaction(
sender,
to=b'',
data=bytecode,
gasprice=gasprice,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
deployed_code = self.eth_getCode(address_decoder(contract_address))
if len(deployed_code) == 0:
raise RuntimeError(
'Deployment of {} failed. Contract address has no code, check gas usage.'.format(
contract_name,
)
)
return self.new_contract_proxy(
contract_interface,
contract_address,
)
def new_filter(self, fromBlock=None, toBlock=None, address=None, topics=None):
""" Creates a filter object, based on filter options, to notify when
the state changes (logs). To check if the state has changed, call
eth_getFilterChanges.
"""
json_data = {
'fromBlock': block_tag_encoder(fromBlock or ''),
'toBlock': block_tag_encoder(toBlock or ''),
}
if address is not None:
json_data['address'] = address_encoder(address)
if topics is not None:
if not isinstance(topics, list):
raise ValueError('topics must be a list')
json_data['topics'] = [topic_encoder(topic) for topic in topics]
filter_id = self.call('eth_newFilter', json_data)
return quantity_decoder(filter_id)
def filter_changes(self, fid: int) -> List:
changes = self.call('eth_getFilterChanges', quantity_encoder(fid))
if not changes:
return list()
assert isinstance(changes, list)
decoders = {
'blockHash': data_decoder,
'transactionHash': data_decoder,
'data': data_decoder,
'address': address_decoder,
'topics': lambda x: [topic_decoder(t) for t in x],
'blockNumber': quantity_decoder,
'logIndex': quantity_decoder,
'transactionIndex': quantity_decoder
}
return [
{k: decoders[k](v) for k, v in c.items() if v is not None}
for c in changes
]
@check_node_connection
def call(self, method: str, *args):
""" Do the request and return the result.
Args:
method: The RPC method.
args: The encoded arguments expected by the method.
- Object arguments must be supplied as a dictionary.
- Quantity arguments must be hex encoded starting with '0x' and
without left zeros.
- Data arguments must be hex encoded starting with '0x'
"""
request = self.protocol.create_request(method, args)
reply = self.transport.send_message(request.serialize().encode())
jsonrpc_reply = self.protocol.parse_reply(reply)
if isinstance(jsonrpc_reply, JSONRPCSuccessResponse):
return jsonrpc_reply.result
elif isinstance(jsonrpc_reply, JSONRPCErrorResponse):
raise EthNodeCommunicationError(jsonrpc_reply.error, jsonrpc_reply._jsonrpc_error_code)
else:
raise EthNodeCommunicationError('Unknown type of JSONRPC reply')
def send_transaction(
self,
sender: address,
to: address,
value: int = 0,
data: bytes = b'',
startgas: int = 0,
gasprice: int = GAS_PRICE,
nonce: Optional[int] = None):
""" Helper to send signed messages.
This method will use the `privkey` provided in the constructor to
locally sign the transaction. This requires an extended server
implementation that accepts the variables v, r, and s.
"""
if not self.privkey and not sender:
raise ValueError('Either privkey or sender needs to be supplied.')
if self.privkey:
privkey_address = privatekey_to_address(self.privkey)
sender = sender or privkey_address
if sender != privkey_address:
raise ValueError('sender for a different privkey.')
if nonce is None:
nonce = self.nonce(sender)
else:
if nonce is None:
nonce = 0
if not startgas:
startgas = self.gaslimit() - 1
tx = Transaction(nonce, gasprice, startgas, to=to, value=value, data=data)
if self.privkey:
tx.sign(self.privkey)
result = self.call(
'eth_sendRawTransaction',
data_encoder(rlp.encode(tx)),
)
return result[2 if result.startswith('0x') else 0:]
else:
# rename the fields to match the eth_sendTransaction signature
tx_dict = tx.to_dict()
tx_dict.pop('hash')
tx_dict['sender'] = sender
tx_dict['gasPrice'] = tx_dict.pop('gasprice')
tx_dict['gas'] = tx_dict.pop('startgas')
res = self.eth_sendTransaction(**tx_dict)
assert len(res) in (20, 32)
return hexlify(res)
def eth_sendTransaction(
self,
sender: address = b'',
to: address = b'',
value: int = 0,
data: bytes = b'',
gasPrice: int = GAS_PRICE,
gas: int = GAS_PRICE,
nonce: Optional[int] = None):
""" Creates new message call transaction or a contract creation, if the
data field contains code.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
(optional when creating new contract)
gas: Gas provided for the transaction execution. It will
return unused gas.
gasPrice: gasPrice used for each unit of gas paid.
value: Value sent with this transaction.
data: The compiled code of a contract OR the hash of the
invoked method signature and encoded parameters.
nonce: This allows to overwrite your own pending transactions
that use the same nonce.
"""
if to == b'' and data.isalnum():
warnings.warn(
'Verify that the data parameter is _not_ hex encoded, if this is the case '
'the data will be double encoded and result in unexpected '
'behavior.'
)
if to == b'0' * 40:
warnings.warn('For contract creation the empty string must be used.')
if sender is None:
raise ValueError('sender needs to be provided.')
json_data = format_data_for_call(
sender,
to,
value,
data,
gas,
gasPrice
)
if nonce is not None:
json_data['nonce'] = quantity_encoder(nonce)
res = self.call('eth_sendTransaction', json_data)
return data_decoder(res)
def eth_call(
self,
sender: address = b'',
to: address = b'',
value: int = 0,
data: bytes = b'',
startgas: int = GAS_PRICE,
gasprice: int = GAS_PRICE,
block_number: Union[str, int] = 'latest'):
""" Executes a new message call immediately without creating a
transaction on the blockchain.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas: Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice: gasPrice used for unit of gas paid.
value: Integer of the value sent with this transaction.
data: Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
json_data = format_data_for_call(
sender,
to,
value,
data,
startgas,
gasprice,
)
res = self.call('eth_call', json_data, block_number)
return data_decoder(res)
def eth_estimateGas(
self,
sender: address = b'',
to: address = b'',
value: int = 0,
data: bytes = b'',
startgas: int = GAS_PRICE,
gasprice: int = GAS_PRICE) -> int:
""" Makes a call or transaction, which won't be added to the blockchain
and returns the used gas, which can be used for estimating the used
gas.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas: Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice: gasPrice used for unit of gas paid.
value: Integer of the value sent with this transaction.
data: Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
json_data = format_data_for_call(
sender,
to,
value,
data,
startgas,
gasprice,
)
try:
res = self.call('eth_estimateGas', json_data)
except EthNodeCommunicationError as e:
tx_would_fail = e.error_code and e.error_code in (-32015, -32000)
if tx_would_fail: # -32015 is parity and -32000 is geth
return None
else:
raise e
return quantity_decoder(res)
def eth_getTransactionReceipt(self, transaction_hash: bytes) -> Dict:
""" Returns the receipt of a transaction by transaction hash.
Args:
transaction_hash: Hash of a transaction.
Returns:
A dict representing the transaction receipt object, or null when no
receipt was found.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior'
)
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)'
)
transaction_hash = data_encoder(transaction_hash)
return self.call('eth_getTransactionReceipt', transaction_hash)
def eth_getCode(self, code_address: address, block: Union[int, str] = 'latest') -> bytes:
""" Returns code at a given address.
Args:
code_address: An address.
block: Integer block number, or the string 'latest',
'earliest' or 'pending'. Default is 'latest'.
"""
if code_address.startswith(b'0x'):
warnings.warn(
'address seems to be already encoded, this will result '
'in unexpected behavior'
)
if len(code_address) != 20:
raise ValueError(
'address length must be 20 (it might be hex encoded)'
)
result = self.call('eth_getCode', address_encoder(code_address), block)
return data_decoder(result)
def eth_getTransactionByHash(self, transaction_hash: bytes):
""" Returns the information about a transaction requested by
transaction hash.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior'
)
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)'
)
transaction_hash = data_encoder(transaction_hash)
return self.call('eth_getTransactionByHash', transaction_hash)
def poll(
self,
transaction_hash: bytes,
confirmations: Optional[int] = None,
timeout: Optional[float] = None):
""" Wait until the `transaction_hash` is applied or rejected.
If timeout is None, this could wait indefinitely!
Args:
transaction_hash: Transaction hash that we are waiting for.
confirmations: Number of block confirmations that we will
wait for.
timeout: Timeout in seconds, raise an Excpetion on timeout.
"""
if transaction_hash.startswith(b'0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior'
)
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)'
)
transaction_hash = data_encoder(transaction_hash)
deadline = None
if timeout:
deadline = gevent.Timeout(timeout)
deadline.start()
try:
# used to check if the transaction was removed, this could happen
# if gas price is too low:
#
# > Transaction (acbca3d6) below gas price (tx=1 Wei ask=18
# > Shannon). All sequential txs from this address(7d0eae79)
# > will be ignored
#
last_result = None
while True:
# Could return None for a short period of time, until the
# transaction is added to the pool
transaction = self.call('eth_getTransactionByHash', transaction_hash)
# if the transaction was added to the pool and then removed
if transaction is None and last_result is not None:
raise Exception('invalid transaction, check gas price')
# the transaction was added to the pool and mined
if transaction and transaction['blockNumber'] is not None:
break
last_result = transaction
gevent.sleep(.5)
if confirmations:
# this will wait for both APPLIED and REVERTED transactions
transaction_block = quantity_decoder(transaction['blockNumber'])
confirmation_block = transaction_block + confirmations
block_number = self.block_number()
while block_number < confirmation_block:
gevent.sleep(.5)
block_number = self.block_number()
except gevent.Timeout:
raise Exception('timeout when polling for transaction')
finally:
if deadline:
deadline.cancel()
import time
from threading import Thread
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(
JSONRPCProtocol(),
HttpPostClientTransport('http://192.168.100.174:10090/'))
remote_server = rpc_client.get_proxy()
topicName = 'test_topic'
topicName = 'display_command'
k = 0
def queryTopics():
while True:
time.sleep(0.05)
result = remote_server.ROSPublishTopics([])
print "Server answered:"
print result
prgThread = Thread(target=queryTopics)
prgThread.setDaemon(True)
prgThread.start()
def __init__(self, port=4000, print_communication=True):
self.transport = HttpPostClientTransport(
'http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
class JSONRPCClient(object):
protocol = JSONRPCProtocol()
def __init__(self, port=4000, print_communication=True):
self.transport = HttpPostClientTransport(
'http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
def call(self, method, *args, **kwargs):
request = self.protocol.create_request(method, args, kwargs)
reply = self.transport.send_message(request.serialize())
if self.print_communication:
print "Request:"
print json.dumps(json.loads(request.serialize()), indent=2)
print "Reply:"
print reply
return self.protocol.parse_reply(reply).result
__call__ = call
def find_block(self, condition):
"""Query all blocks one by one and return the first one for which
`condition(block)` evaluates to `True`.
"""
i = 0
while True:
block = self.call('eth_getBlockByNumber',
quantity_encoder(i),
True,
print_comm=False)
if condition(block):
return block
i += 1
def eth_sendTransaction(self,
nonce=None,
sender='',
to='',
value=0,
data='',
gasprice=default_gasprice,
startgas=default_startgas,
v=None,
r=None,
s=None):
encoders = dict(nonce=quantity_encoder,
sender=address_encoder,
to=data_encoder,
value=quantity_encoder,
gasprice=quantity_encoder,
startgas=quantity_encoder,
data=data_encoder,
v=quantity_encoder,
r=quantity_encoder,
s=quantity_encoder)
data = {
k: encoders[k](v)
for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None
}
data['from'] = data.pop('sender')
assert data.get('from') or (v and r and s)
res = self.call('eth_sendTransaction', data)
return data_decoder(res)
'''
refer : https://github.com/mbr/tinyrpc/tree/master/examples
import gevent
import tinyrpc
import gevent-websocket
'''
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(JSONRPCProtocol(),
HttpPostClientTransport('http://127.0.0.1:5000/'))
remote_server = rpc_client.get_proxy()
# call a method called 'reverse_string' with a single string argument
result = remote_server.reverse_string('Hello, World!')
print("Server answered: ", result)
class JSONRPCClient(object):
protocol = JSONRPCProtocol()
def __init__(self,
host='127.0.0.1',
port=4000,
print_communication=True,
privkey=None,
sender=None,
use_ssl=False,
transport=None):
"specify privkey for local signing"
if transport is None:
self.transport = HttpPostClientTransport(
'{}://{}:{}'.format('https' if use_ssl else 'http', host,
port),
headers={'content-type': 'application/json'})
else:
self.transport = transport
self.print_communication = print_communication
self.privkey = privkey
self._sender = sender
self.port = port
def __repr__(self):
return '<JSONRPCClient @%d>' % self.port
@property
def sender(self):
if self.privkey:
return privtoaddr(self.privkey)
if self._sender is None:
self._sender = self.coinbase
return self._sender
@property
def coinbase(self):
""" Return the client coinbase address. """
return address_decoder(self.call('eth_coinbase'))
def blocknumber(self):
""" Return the most recent block. """
return quantity_decoder(self.call('eth_blockNumber'))
def nonce(self, address):
if len(address) == 40:
address = address.decode('hex')
try:
res = self.call('eth_nonce', address_encoder(address), 'pending')
return quantity_decoder(res)
except JSONRPCClientReplyError as e:
if e.message == 'Method not found':
raise JSONRPCClientReplyError(
"'eth_nonce' is not supported by your endpoint (pyethapp only). "
"For transactions use server-side nonces: "
"('eth_sendTransaction' with 'nonce=None')")
raise e
def balance(self, account):
""" Return the balance of the account of given address. """
res = self.call('eth_getBalance', address_encoder(account), 'pending')
return quantity_decoder(res)
def gaslimit(self):
return quantity_decoder(self.call('eth_gasLimit'))
def lastgasprice(self):
return quantity_decoder(self.call('eth_lastGasPrice'))
def new_abi_contract(self, contract_interface, address):
warnings.warn('deprecated, use new_contract_proxy', DeprecationWarning)
return self.new_contract_proxy(contract_interface, address)
def new_contract_proxy(self, contract_interface, address):
""" Return a proxy for interacting with a smart contract.
Args:
contract_interface: The contract interface as defined by the json.
address: The contract's address.
"""
sender = self.sender or privtoaddr(self.privkey)
return ContractProxy(
sender,
contract_interface,
address,
self.eth_call,
self.send_transaction,
)
def deploy_solidity_contract(
self,
sender,
contract_name,
all_contracts, # pylint: disable=too-many-locals
libraries,
constructor_parameters,
timeout=None,
gasprice=denoms.wei):
if contract_name not in all_contracts:
raise ValueError('Unkonwn contract {}'.format(contract_name))
libraries = dict(libraries)
contract = all_contracts[contract_name]
contract_interface = contract['abi']
symbols = solidity_unresolved_symbols(contract['bin_hex'])
if symbols:
available_symbols = map(solidity_library_symbol,
all_contracts.keys()) # pylint: disable=bad-builtin
unknown_symbols = set(symbols) - set(available_symbols)
if unknown_symbols:
msg = 'Cannot deploy contract, known symbols {}, unresolved symbols {}.'.format(
available_symbols,
unknown_symbols,
)
raise Exception(msg)
dependencies = deploy_dependencies_symbols(all_contracts)
deployment_order = dependencies_order_of_build(
contract_name, dependencies)
deployment_order.pop() # remove `contract_name` from the list
log.debug('Deploing dependencies: {}'.format(
str(deployment_order)))
for deploy_contract in deployment_order:
dependency_contract = all_contracts[deploy_contract]
hex_bytecode = solidity_resolve_symbols(
dependency_contract['bin_hex'], libraries)
bytecode = hex_bytecode.decode('hex')
dependency_contract['bin_hex'] = hex_bytecode
dependency_contract['bin'] = bytecode
transaction_hash = self.send_transaction(
sender,
to='',
data=bytecode,
gasprice=gasprice,
)
self.poll(transaction_hash.decode('hex'), timeout=timeout)
receipt = self.call('eth_getTransactionReceipt',
'0x' + transaction_hash)
contract_address = receipt['contractAddress']
contract_address = contract_address[
2:] # remove the hexadecimal prefix 0x from the address
libraries[deploy_contract] = contract_address
deployed_code = self.call('eth_getCode', contract_address,
'latest')
if deployed_code == '0x':
raise RuntimeError(
"Contract address has no code, check gas usage.")
hex_bytecode = solidity_resolve_symbols(contract['bin_hex'],
libraries)
bytecode = hex_bytecode.decode('hex')
contract['bin_hex'] = hex_bytecode
contract['bin'] = bytecode
if constructor_parameters:
translator = ContractTranslator(contract_interface)
parameters = translator.encode_constructor_arguments(
constructor_parameters)
bytecode = contract['bin'] + parameters
else:
bytecode = contract['bin']
transaction_hash = self.send_transaction(
sender,
to='',
data=bytecode,
gasprice=gasprice,
)
self.poll(transaction_hash.decode('hex'), timeout=timeout)
receipt = self.call('eth_getTransactionReceipt',
'0x' + transaction_hash)
contract_address = receipt['contractAddress']
deployed_code = self.call('eth_getCode', contract_address, 'latest')
if deployed_code == '0x':
raise RuntimeError(
"Deployment of {} failed. Contract address has no code, check gas usage."
.format(contract_name))
return ContractProxy(
sender,
contract_interface,
contract_address,
self.eth_call,
self.send_transaction,
)
def find_block(self, condition):
"""Query all blocks one by one and return the first one for which
`condition(block)` evaluates to `True`.
"""
i = 0
while True:
block = self.call('eth_getBlockByNumber', quantity_encoder(i),
True)
if condition(block) or not block:
return block
i += 1
def new_filter(self,
fromBlock=None,
toBlock=None,
address=None,
topics=None):
""" Creates a filter object, based on filter options, to notify when
the state changes (logs). To check if the state has changed, call
eth_getFilterChanges.
"""
json_data = {
'fromBlock': block_tag_encoder(fromBlock or ''),
'toBlock': block_tag_encoder(toBlock or ''),
}
if address is not None:
json_data['address'] = address_encoder(address)
if topics is not None:
if not isinstance(topics, list):
raise ValueError('topics must be a list')
json_data['topics'] = [topic_encoder(topic) for topic in topics]
filter_id = self.call('eth_newFilter', json_data)
return quantity_decoder(filter_id)
def filter_changes(self, fid):
changes = self.call('eth_getFilterChanges', quantity_encoder(fid))
if not changes:
return None
elif isinstance(changes, bytes):
return data_decoder(changes)
else:
decoders = dict(blockHash=data_decoder,
transactionHash=data_decoder,
data=data_decoder,
address=address_decoder,
topics=lambda x: [topic_decoder(t) for t in x],
blockNumber=quantity_decoder,
logIndex=quantity_decoder,
transactionIndex=quantity_decoder)
return [{k: decoders[k](v)
for k, v in c.items() if v is not None} for c in changes]
def call(self, method, *args):
""" Do the request and returns the result.
Args:
method (str): The RPC method.
args: The encoded arguments expected by the method.
- Object arguments must be supplied as an dictionary.
- Quantity arguments must be hex encoded starting with '0x' and
without left zeros.
- Data arguments must be hex encoded starting with '0x'
"""
request = self.protocol.create_request(method, args)
reply = self.transport.send_message(request.serialize())
if self.print_communication:
print json.dumps(json.loads(request.serialize()), indent=2)
print reply
jsonrpc_reply = self.protocol.parse_reply(reply)
if isinstance(jsonrpc_reply, JSONRPCSuccessResponse):
return jsonrpc_reply.result
elif isinstance(jsonrpc_reply, JSONRPCErrorResponse):
raise JSONRPCClientReplyError(jsonrpc_reply.error)
else:
raise JSONRPCClientReplyError('Unknown type of JSONRPC reply')
__call__ = call
def send_transaction(self,
sender,
to,
value=0,
data='',
startgas=0,
gasprice=10 * denoms.szabo,
nonce=None):
""" Helper to send signed messages.
This method will use the `privkey` provided in the constructor to
locally sign the transaction. This requires an extended server
implementation that accepts the variables v, r, and s.
"""
if not self.privkey and not sender:
raise ValueError('Either privkey or sender needs to be supplied.')
if self.privkey and not sender:
sender = privtoaddr(self.privkey)
if nonce is None:
nonce = self.nonce(sender)
elif self.privkey:
if sender != privtoaddr(self.privkey):
raise ValueError('sender for a different privkey.')
if nonce is None:
nonce = self.nonce(sender)
else:
if nonce is None:
nonce = 0
if not startgas:
startgas = self.gaslimit() - 1
tx = Transaction(nonce,
gasprice,
startgas,
to=to,
value=value,
data=data)
if self.privkey:
# add the fields v, r and s
tx.sign(self.privkey)
tx_dict = tx.to_dict()
# rename the fields to match the eth_sendTransaction signature
tx_dict.pop('hash')
tx_dict['sender'] = sender
tx_dict['gasPrice'] = tx_dict.pop('gasprice')
tx_dict['gas'] = tx_dict.pop('startgas')
res = self.eth_sendTransaction(**tx_dict)
assert len(res) in (20, 32)
return res.encode('hex')
def eth_sendTransaction(self,
nonce=None,
sender='',
to='',
value=0,
data='',
gasPrice=default_gasprice,
gas=default_startgas,
v=None,
r=None,
s=None):
""" Creates new message call transaction or a contract creation, if the
data field contains code.
Note:
The support for local signing through the variables v,r,s is not
part of the standard spec, a extended server is required.
Args:
from (address): The 20 bytes address the transaction is send from.
to (address): DATA, 20 Bytes - (optional when creating new
contract) The address the transaction is directed to.
gas (int): Gas provided for the transaction execution. It will
return unused gas.
gasPrice (int): gasPrice used for each paid gas.
value (int): Value send with this transaction.
data (bin): The compiled code of a contract OR the hash of the
invoked method signature and encoded parameters.
nonce (int): This allows to overwrite your own pending transactions
that use the same nonce.
"""
if to == '' and data.isalnum():
warnings.warn(
'Verify that the data parameter is _not_ hex encoded, if this is the case '
'the data will be double encoded and result in unexpected '
'behavior.')
if to == '0' * 40:
warnings.warn(
'For contract creating the empty string must be used.')
json_data = {
'to': data_encoder(normalize_address(to, allow_blank=True)),
'value': quantity_encoder(value),
'gasPrice': quantity_encoder(gasPrice),
'gas': quantity_encoder(gas),
'data': data_encoder(data),
}
if not sender and not (v and r and s):
raise ValueError('Either sender or v, r, s needs to be informed.')
if sender is not None:
json_data['from'] = address_encoder(sender)
if v and r and s:
json_data['v'] = quantity_encoder(v)
json_data['r'] = quantity_encoder(r)
json_data['s'] = quantity_encoder(s)
if nonce is not None:
json_data['nonce'] = quantity_encoder(nonce)
res = self.call('eth_sendTransaction', json_data)
return data_decoder(res)
def eth_call(self,
sender='',
to='',
value=0,
data='',
startgas=default_startgas,
gasprice=default_gasprice,
block_number='latest'):
""" Executes a new message call immediately without creating a
transaction on the block chain.
Args:
from: The address the transaction is send from.
to: The address the transaction is directed to.
gas (int): Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice (int): gasPrice used for each paid gas.
value (int): Integer of the value send with this transaction.
data (bin): Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
json_data = dict()
if sender is not None:
json_data['from'] = address_encoder(sender)
if to is not None:
json_data['to'] = data_encoder(to)
if value is not None:
json_data['value'] = quantity_encoder(value)
if gasprice is not None:
json_data['gasPrice'] = quantity_encoder(gasprice)
if startgas is not None:
json_data['gas'] = quantity_encoder(startgas)
if data is not None:
json_data['data'] = data_encoder(data)
res = self.call('eth_call', json_data, block_number)
return data_decoder(res)
def poll(self, transaction_hash, confirmations=None, timeout=None):
""" Wait until the `transaction_hash` is applied or rejected.
If timeout is None, this could wait indefinitely!
Args:
transaction_hash (hash): Transaction hash that we are waiting for.
confirmations (int): Number of block confirmations that we will
wait for.
timeout (float): Timeout in seconds, raise an Excpetion on
timeout.
"""
if transaction_hash.startswith('0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will result '
'in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encode)')
deadline = None
if timeout:
deadline = time.time() + timeout
transaction_hash = data_encoder(transaction_hash)
transaction = self.call('eth_getTransactionByHash', transaction_hash)
while transaction is None or transaction["blockNumber"] is None:
if deadline and time.time() > deadline:
raise Exception('timeout when polling for transaction')
gevent.sleep(.5)
transaction = self.call('eth_getTransactionByHash',
transaction_hash)
if confirmations is None:
return
# this will wait for both APPLIED and REVERTED transactions
transaction_block = quantity_decoder(transaction['blockNumber'])
confirmation_block = transaction_block + confirmations
block_number = self.blocknumber()
while confirmation_block > block_number:
if deadline and time.time() > deadline:
raise Exception('timeout when waiting for confirmation')
gevent.sleep(.5)
block_number = self.blocknumber()
# -*- coding: utf-8 -*-
"""Example RPC client for controlling a wotabag.
Requires tinrypc[httpclient] (https://github.com/mbr/tinyrpc).
"""
import time
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(
JSONRPCProtocol(),
HttpPostClientTransport('http://raspberrypi.local:60715/'))
server = rpc_client.get_proxy(prefix='wotabag.')
# Retrieve server status
result = server.get_status()
print(result)
# Retrieve server playlist
result = server.get_playlist()
print(result)
# Test LED patterns
server.test_pattern()
# Start playback
def __init__(self, port=4000, print_communication=True):
self.transport = HttpPostClientTransport("http://127.0.0.1:{}".format(port))
self.print_communication = print_communication
class JSONRPCClient(object):
protocol = JSONRPCProtocol()
def __init__(self, port=4000, print_communication=True, privkey=None, sender=None):
"specify privkey for local signing"
self.transport = HttpPostClientTransport('http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
self.privkey = privkey
self._sender = sender
@property
def sender(self):
if self.privkey:
return privtoaddr(self.privkey)
if self._sender is None:
self._sender = self.coinbase
return self._sender
def call(self, method, *args, **kwargs):
request = self.protocol.create_request(method, args, kwargs)
reply = self.transport.send_message(request.serialize())
if self.print_communication:
print json.dumps(json.loads(request.serialize()), indent=2)
print reply
return self.protocol.parse_reply(reply).result
__call__ = call
def find_block(self, condition):
"""Query all blocks one by one and return the first one for which
`condition(block)` evaluates to `True`.
"""
i = 0
while True:
block = self.call('eth_getBlockByNumber', quantity_encoder(i), True, print_comm=False)
if condition(block):
return block
i += 1
def eth_sendTransaction(self, nonce=None, sender='', to='', value=0, data='',
gasPrice=default_gasprice, gas=default_startgas,
v=None, r=None, s=None):
encoders = dict(nonce=quantity_encoder, sender=address_encoder, to=data_encoder,
value=quantity_encoder, gasPrice=quantity_encoder,
gas=quantity_encoder, data=data_encoder,
v=quantity_encoder, r=quantity_encoder, s=quantity_encoder)
data = {k: encoders[k](v) for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None}
data['from'] = data.pop('sender')
assert data.get('from') or (v and r and s)
res = self.call('eth_sendTransaction', data)
return data_decoder(res)
def eth_call(self, sender='', to='', value=0, data='',
startgas=default_startgas, gasprice=default_gasprice):
"call on pending block"
encoders = dict(sender=address_encoder, to=data_encoder,
value=quantity_encoder, gasprice=quantity_encoder,
startgas=quantity_encoder, data=data_encoder)
data = {k: encoders[k](v) for k, v in locals().items()
if k not in ('self', 'encoders') and v is not None}
for k, v in dict(gasprice='gasPrice', startgas='gas', sender='from').items():
data[v] = data.pop(k)
res = self.call('eth_call', data)
return data_decoder(res)
def blocknumber(self):
return quantity_decoder(self.call('eth_blockNumber'))
def nonce(self, address):
if len(address) == 40:
address = address.decode('hex')
return quantity_decoder(
self.call('eth_getTransactionCount', address_encoder(address), 'pending'))
@property
def coinbase(self):
return address_decoder(self.call('eth_coinbase'))
def balance(self, account):
b = quantity_decoder(
self.call('eth_getBalance', address_encoder(account), 'pending'))
return b
def gaslimit(self):
return quantity_decoder(self.call('eth_gasLimit'))
def lastgasprice(self):
return quantity_decoder(self.call('eth_lastGasPrice'))
def send_transaction(self, sender, to, value=0, data='', startgas=0, gasprice=10*denoms.szabo):
"can send a locally signed transaction if privkey is given"
assert self.privkey or sender
if self.privkey:
_sender = sender
sender = privtoaddr(self.privkey)
assert sender == _sender
# fetch nonce
nonce = self.nonce(sender)
if not startgas:
startgas = quantity_decoder(self.call('eth_gasLimit')) - 1
# create transaction
tx = Transaction(nonce, gasprice, startgas, to=to, value=value, data=data)
if self.privkey:
tx.sign(self.privkey)
tx_dict = tx.to_dict()
tx_dict.pop('hash')
for k, v in dict(gasprice='gasPrice', startgas='gas', sender='from').items():
tx_dict[v] = tx_dict.pop(k)
res = self.eth_sendTransaction(**tx_dict)
assert len(res) in (20, 32)
return res.encode('hex')
def new_abi_contract(self, _abi, address):
sender = self.sender or privtoaddr(self.privkey)
return ABIContract(sender, _abi, address, self.eth_call, self.send_transaction)
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(
JSONRPCProtocol(),
HttpPostClientTransport('http://localhost:5000/v1/jsonrpc')
)
rpc_server = rpc_client.get_proxy()
print "pinging..."
pong = rpc_server.ping()
print "ping response: " + pong
resp = rpc_server.hello("Ashutosh")
print "hello world response: " + resp
def __init__(self, port=4000, print_communication=True, privkey=None, sender=None):
"specify privkey for local signing"
self.transport = HttpPostClientTransport('http://127.0.0.1:{}'.format(port))
self.print_communication = print_communication
self.privkey = privkey
self._sender = sender
class JSONRPCClient(object):
""" Ethereum JSON RPC client.
Args:
host (str): Ethereum node host address.
port (int): Ethereum node port number.
privkey (bin): Local user private key, used to sign transactions.
nonce_update_interval (float): Update the account nonce every
`nonce_update_interval` seconds.
nonce_offset (int): Network's default base nonce number.
"""
def __init__(self,
host,
port,
privkey,
nonce_update_interval=5.0,
nonce_offset=0):
endpoint = 'http://{}:{}'.format(host, port)
session = requests.Session()
adapter = requests.adapters.HTTPAdapter(pool_maxsize=50)
session.mount(endpoint, adapter)
self.transport = HttpPostClientTransport(
endpoint,
post_method=session.post,
headers={'content-type': 'application/json'},
)
self.port = port
self.privkey = privkey
self.protocol = JSONRPCProtocol()
self.sender = privatekey_to_address(privkey)
self.nonce_last_update = 0
self.nonce_current_value = None
self.nonce_lock = Semaphore()
self.nonce_update_interval = nonce_update_interval
self.nonce_offset = nonce_offset
def __repr__(self):
return '<JSONRPCClient @%d>' % self.port
def blocknumber(self):
""" Return the most recent block. """
return quantity_decoder(self.call('eth_blockNumber'))
def nonce(self, address):
if len(address) == 40:
address = unhexlify(address)
with self.nonce_lock:
initialized = self.nonce_current_value is not None
query_time = now()
if self.nonce_last_update > query_time:
# Python's 2.7 time is not monotonic and it's affected by clock
# resets, force an update.
self.nonce_update_interval = query_time - self.nonce_update_interval
needs_update = True
else:
last_update_interval = query_time - self.nonce_last_update
needs_update = last_update_interval > self.nonce_update_interval
if initialized and not needs_update:
self.nonce_current_value += 1
return self.nonce_current_value
pending_transactions_hex = self.call(
'eth_getTransactionCount',
address_encoder(address),
'pending',
)
pending_transactions = quantity_decoder(pending_transactions_hex)
nonce = pending_transactions + self.nonce_offset
# we may have hammered the server and not all tx are
# registered as `pending` yet
while nonce < self.nonce_current_value:
log.debug(
'nonce on server too low; retrying',
server=nonce,
local=self.nonce_current_value,
)
query_time = now()
pending_transactions_hex = self.call(
'eth_getTransactionCount',
address_encoder(address),
'pending',
)
pending_transactions = quantity_decoder(
pending_transactions_hex)
nonce = pending_transactions + self.nonce_offset
self.nonce_current_value = nonce
self.nonce_last_update = query_time
return self.nonce_current_value
def balance(self, account):
""" Return the balance of the account of given address. """
res = self.call('eth_getBalance', address_encoder(account), 'pending')
return quantity_decoder(res)
def gaslimit(self):
last_block = self.call('eth_getBlockByNumber', 'latest', True)
gas_limit = quantity_decoder(last_block['gasLimit'])
return gas_limit
def new_contract_proxy(self, contract_interface, address):
""" Return a proxy for interacting with a smart contract.
Args:
contract_interface: The contract interface as defined by the json.
address: The contract's address.
"""
return ContractProxy(
self.sender,
contract_interface,
address,
self.eth_call,
self.send_transaction,
self.eth_estimateGas,
)
def deploy_solidity_contract(
self, # pylint: disable=too-many-locals
sender,
contract_name,
all_contracts,
libraries,
constructor_parameters,
contract_path=None,
timeout=None,
gasprice=GAS_PRICE):
"""
Deploy a solidity contract.
Args:
sender (address): the sender address
contract_name (str): the name of the contract to compile
all_contracts (dict): the json dictionary containing the result of compiling a file
libraries (list): A list of libraries to use in deployment
constructor_parameters (tuple): A tuple of arguments to pass to the constructor
contract_path (str): If we are dealing with solc >= v0.4.9 then the path
to the contract is a required argument to extract
the contract data from the `all_contracts` dict.
timeout (int): Amount of time to poll the chain to confirm deployment
gasprice: The gasprice to provide for the transaction
"""
if contract_name in all_contracts:
contract_key = contract_name
elif contract_path is not None:
_, filename = os.path.split(contract_path)
contract_key = filename + ':' + contract_name
if contract_key not in all_contracts:
raise ValueError('Unknown contract {}'.format(contract_name))
else:
raise ValueError(
'Unknown contract {} and no contract_path given'.format(
contract_name))
libraries = dict(libraries)
contract = all_contracts[contract_key]
contract_interface = contract['abi']
symbols = solidity_unresolved_symbols(contract['bin_hex'])
if symbols:
available_symbols = map(solidity_library_symbol,
all_contracts.keys())
unknown_symbols = set(symbols) - set(available_symbols)
if unknown_symbols:
msg = 'Cannot deploy contract, known symbols {}, unresolved symbols {}.'.format(
available_symbols,
unknown_symbols,
)
raise Exception(msg)
dependencies = deploy_dependencies_symbols(all_contracts)
deployment_order = dependencies_order_of_build(
contract_key, dependencies)
deployment_order.pop() # remove `contract_name` from the list
log.debug('Deploying dependencies: {}'.format(
str(deployment_order)))
for deploy_contract in deployment_order:
dependency_contract = all_contracts[deploy_contract]
hex_bytecode = solidity_resolve_symbols(
dependency_contract['bin_hex'], libraries)
bytecode = unhexlify(hex_bytecode)
dependency_contract['bin_hex'] = hex_bytecode
dependency_contract['bin'] = bytecode
transaction_hash_hex = self.send_transaction(
sender,
to='',
data=bytecode,
gasprice=gasprice,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
# remove the hexadecimal prefix 0x from the address
contract_address = contract_address[2:]
libraries[deploy_contract] = contract_address
deployed_code = self.eth_getCode(unhexlify(contract_address))
if deployed_code == '0x':
raise RuntimeError(
'Contract address has no code, check gas usage.')
hex_bytecode = solidity_resolve_symbols(contract['bin_hex'],
libraries)
bytecode = unhexlify(hex_bytecode)
contract['bin_hex'] = hex_bytecode
contract['bin'] = bytecode
if constructor_parameters:
translator = ContractTranslator(contract_interface)
parameters = translator.encode_constructor_arguments(
constructor_parameters)
bytecode = contract['bin'] + parameters
else:
bytecode = contract['bin']
transaction_hash_hex = self.send_transaction(
sender,
to='',
data=bytecode,
gasprice=gasprice,
)
transaction_hash = unhexlify(transaction_hash_hex)
self.poll(transaction_hash, timeout=timeout)
receipt = self.eth_getTransactionReceipt(transaction_hash)
contract_address = receipt['contractAddress']
deployed_code = self.eth_getCode(unhexlify(contract_address[2:]))
if deployed_code == '0x':
raise RuntimeError(
'Deployment of {} failed. Contract address has no code, check gas usage.'
.format(contract_name, ))
return self.new_contract_proxy(
contract_interface,
contract_address,
)
def new_filter(self,
fromBlock=None,
toBlock=None,
address=None,
topics=None):
""" Creates a filter object, based on filter options, to notify when
the state changes (logs). To check if the state has changed, call
eth_getFilterChanges.
"""
json_data = {
'fromBlock': block_tag_encoder(fromBlock or ''),
'toBlock': block_tag_encoder(toBlock or ''),
}
if address is not None:
json_data['address'] = address_encoder(address)
if topics is not None:
if not isinstance(topics, list):
raise ValueError('topics must be a list')
json_data['topics'] = [topic_encoder(topic) for topic in topics]
filter_id = self.call('eth_newFilter', json_data)
return quantity_decoder(filter_id)
def filter_changes(self, fid):
changes = self.call('eth_getFilterChanges', quantity_encoder(fid))
if not changes:
return None
if isinstance(changes, bytes):
return data_decoder(changes)
decoders = {
'blockHash': data_decoder,
'transactionHash': data_decoder,
'data': data_decoder,
'address': address_decoder,
'topics': lambda x: [topic_decoder(t) for t in x],
'blockNumber': quantity_decoder,
'logIndex': quantity_decoder,
'transactionIndex': quantity_decoder
}
return [{k: decoders[k](v)
for k, v in c.items() if v is not None} for c in changes]
@check_node_connection
def call(self, method, *args):
""" Do the request and return the result.
Args:
method (str): The RPC method.
args: The encoded arguments expected by the method.
- Object arguments must be supplied as a dictionary.
- Quantity arguments must be hex encoded starting with '0x' and
without left zeros.
- Data arguments must be hex encoded starting with '0x'
"""
request = self.protocol.create_request(method, args)
reply = self.transport.send_message(request.serialize())
jsonrpc_reply = self.protocol.parse_reply(reply)
if isinstance(jsonrpc_reply, JSONRPCSuccessResponse):
return jsonrpc_reply.result
elif isinstance(jsonrpc_reply, JSONRPCErrorResponse):
raise EthNodeCommunicationError(jsonrpc_reply.error)
else:
raise EthNodeCommunicationError('Unknown type of JSONRPC reply')
def send_transaction(self,
sender,
to,
value=0,
data='',
startgas=0,
gasprice=GAS_PRICE,
nonce=None):
""" Helper to send signed messages.
This method will use the `privkey` provided in the constructor to
locally sign the transaction. This requires an extended server
implementation that accepts the variables v, r, and s.
"""
if not self.privkey and not sender:
raise ValueError('Either privkey or sender needs to be supplied.')
if self.privkey:
privkey_address = privatekey_to_address(self.privkey)
sender = sender or privkey_address
if sender != privkey_address:
raise ValueError('sender for a different privkey.')
if nonce is None:
nonce = self.nonce(sender)
else:
if nonce is None:
nonce = 0
if not startgas:
startgas = self.gaslimit() - 1
tx = Transaction(nonce,
gasprice,
startgas,
to=to,
value=value,
data=data)
if self.privkey:
tx.sign(self.privkey)
result = self.call(
'eth_sendRawTransaction',
data_encoder(rlp.encode(tx)),
)
return result[2 if result.startswith('0x') else 0:]
else:
# rename the fields to match the eth_sendTransaction signature
tx_dict = tx.to_dict()
tx_dict.pop('hash')
tx_dict['sender'] = sender
tx_dict['gasPrice'] = tx_dict.pop('gasprice')
tx_dict['gas'] = tx_dict.pop('startgas')
res = self.eth_sendTransaction(**tx_dict)
assert len(res) in (20, 32)
return hexlify(res)
def eth_sendTransaction(self,
nonce=None,
sender='',
to='',
value=0,
data='',
gasPrice=GAS_PRICE,
gas=GAS_PRICE):
""" Creates new message call transaction or a contract creation, if the
data field contains code.
Args:
sender (address): The 20 bytes address the transaction is sent from.
to (address): DATA, 20 Bytes - (optional when creating new
contract) The address the transaction is directed to.
gas (int): Gas provided for the transaction execution. It will
return unused gas.
gasPrice (int): gasPrice used for each unit of gas paid.
value (int): Value sent with this transaction.
data (bin): The compiled code of a contract OR the hash of the
invoked method signature and encoded parameters.
nonce (int): This allows to overwrite your own pending transactions
that use the same nonce.
"""
if to == '' and data.isalnum():
warnings.warn(
'Verify that the data parameter is _not_ hex encoded, if this is the case '
'the data will be double encoded and result in unexpected '
'behavior.')
if to == '0' * 40:
warnings.warn(
'For contract creation the empty string must be used.')
if sender is None:
raise ValueError('sender needs to be provided.')
json_data = {
'to': data_encoder(normalize_address(to, allow_blank=True)),
'value': quantity_encoder(value),
'gasPrice': quantity_encoder(gasPrice),
'gas': quantity_encoder(gas),
'data': data_encoder(data),
'from': address_encoder(sender),
}
if nonce is not None:
json_data['nonce'] = quantity_encoder(nonce)
res = self.call('eth_sendTransaction', json_data)
return data_decoder(res)
def eth_call(self,
sender='',
to='',
value=0,
data='',
startgas=GAS_PRICE,
gasprice=GAS_PRICE,
block_number='latest'):
""" Executes a new message call immediately without creating a
transaction on the blockchain.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas (int): Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice (int): gasPrice used for unit of gas paid.
value (int): Integer of the value sent with this transaction.
data (bin): Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
json_data = format_data_for_call(
sender,
to,
value,
data,
startgas,
gasprice,
)
res = self.call('eth_call', json_data, block_number)
return data_decoder(res)
def eth_estimateGas(self,
sender='',
to='',
value=0,
data='',
startgas=GAS_PRICE,
gasprice=GAS_PRICE):
""" Makes a call or transaction, which won't be added to the blockchain
and returns the used gas, which can be used for estimating the used
gas.
Args:
sender: The address the transaction is sent from.
to: The address the transaction is directed to.
gas (int): Gas provided for the transaction execution. eth_call
consumes zero gas, but this parameter may be needed by some
executions.
gasPrice (int): gasPrice used for unit of gas paid.
value (int): Integer of the value sent with this transaction.
data (bin): Hash of the method signature and encoded parameters.
For details see Ethereum Contract ABI.
block_number: Determines the state of ethereum used in the
call.
"""
json_data = format_data_for_call(
sender,
to,
value,
data,
startgas,
gasprice,
)
res = self.call('eth_estimateGas', json_data)
return quantity_decoder(res)
def eth_getTransactionReceipt(self, transaction_hash):
""" Returns the receipt of a transaction by transaction hash.
Args:
transaction_hash: Hash of a transaction.
Returns:
A dict representing the transaction receipt object, or null when no
receipt was found.
"""
if transaction_hash.startswith('0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
return self.call('eth_getTransactionReceipt', transaction_hash)
def eth_getCode(self, address, block='latest'):
""" Returns code at a given address.
Args:
address: An address.
block: Integer block number, or the string 'latest',
'earliest' or 'pending'.
"""
if address.startswith('0x'):
warnings.warn(
'address seems to be already encoded, this will result '
'in unexpected behavior')
if len(address) != 20:
raise ValueError(
'address length must be 20 (it might be hex encoded)')
return self.call(
'eth_getCode',
address_encoder(address),
block,
)
def eth_getTransactionByHash(self, transaction_hash):
""" Returns the information about a transaction requested by
transaction hash.
"""
if transaction_hash.startswith('0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
return self.call('eth_getTransactionByHash', transaction_hash)
def poll(self, transaction_hash, confirmations=None, timeout=None):
""" Wait until the `transaction_hash` is applied or rejected.
If timeout is None, this could wait indefinitely!
Args:
transaction_hash (hash): Transaction hash that we are waiting for.
confirmations (int): Number of block confirmations that we will
wait for.
timeout (float): Timeout in seconds, raise an Excpetion on
timeout.
"""
if transaction_hash.startswith('0x'):
warnings.warn(
'transaction_hash seems to be already encoded, this will'
' result in unexpected behavior')
if len(transaction_hash) != 32:
raise ValueError(
'transaction_hash length must be 32 (it might be hex encoded)')
transaction_hash = data_encoder(transaction_hash)
deadline = None
if timeout:
deadline = gevent.Timeout(timeout)
deadline.start()
try:
# used to check if the transaction was removed, this could happen
# if gas price is too low:
#
# > Transaction (acbca3d6) below gas price (tx=1 Wei ask=18
# > Shannon). All sequential txs from this address(7d0eae79)
# > will be ignored
#
last_result = None
while True:
# Could return None for a short period of time, until the
# transaction is added to the pool
transaction = self.call('eth_getTransactionByHash',
transaction_hash)
# if the transaction was added to the pool and then removed
if transaction is None and last_result is not None:
raise Exception('invalid transaction, check gas price')
# the transaction was added to the pool and mined
if transaction and transaction['blockNumber'] is not None:
break
last_result = transaction
gevent.sleep(.5)
if confirmations:
# this will wait for both APPLIED and REVERTED transactions
transaction_block = quantity_decoder(
transaction['blockNumber'])
confirmation_block = transaction_block + confirmations
block_number = self.blocknumber()
while block_number < confirmation_block:
gevent.sleep(.5)
block_number = self.blocknumber()
except gevent.Timeout:
raise Exception('timeout when polling for transaction')
finally:
if deadline:
deadline.cancel()
* we use the tinyrpc python package that allows us to represent the timetagger webserver
as a python class and will hide all JSON-RPC details from us.
* The methods of this 'proxy class' are equivalent to the JSON-RPC interface
"""
#from jsonrpc import ServiceProxy
#timetagger = ServiceProxy('http://localhost:8080/json-rpc')
from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
from tinyrpc.transports.http import HttpPostClientTransport
from tinyrpc import RPCClient
rpc_client = RPCClient(
JSONRPCProtocol(),
HttpPostClientTransport('http://localhost:8080/json-rpc'))
# create the proxy class
timetagger = rpc_client.get_proxy()
timetagger.getSystemInfo()
timetagger.scanDevices()
res = timetagger.getDeviceList()
dev_id = res[0]['id'] # dev_id = '12520004J3' # FPGA serial number
res = timetagger.getModuleList(device=dev_id)
mod_id = res[0][
'id'] # mod_id = 'ID-000001' # module created in web application beforehand
timetagger.getDeviceInfo(device=dev_id)
