def test_waiting_transactions(ms_database: Database):
assert ms_database.get_waiting_transactions() == []
ms_database.add_waiting_transaction(TransactionHash(b"A"))
assert ms_database.get_waiting_transactions() == [b"A"]
ms_database.add_waiting_transaction(TransactionHash(b"B"))
assert ms_database.get_waiting_transactions() == [b"A", b"B"]
ms_database.remove_waiting_transaction(TransactionHash(b"A"))
assert ms_database.get_waiting_transactions() == [b"B"]
def send_transaction(self,
to: Address,
startgas: int,
value: int = 0,
data: bytes = b"") -> TransactionHash:
""" Locally sign the transaction and send it to the network. """
with self._sent_lock:
if self._sent:
raise RaidenUnrecoverableError(
f"A transaction for this slot has been sent already! "
f"Reusing the nonce is a synchronization problem.")
if to == to_canonical_address(NULL_ADDRESS_HEX):
warnings.warn(
"For contract creation the empty string must be used.")
gas_price = self._client.gas_price()
transaction = {
"data": data,
"gas": startgas,
"nonce": self.nonce,
"value": value,
"gasPrice": gas_price,
}
node_gas_price = self._client.web3.eth.gasPrice
log.debug(
"Calculated gas price for transaction",
node=to_checksum_address(self._client.address),
calculated_gas_price=gas_price,
node_gas_price=node_gas_price,
)
# add the to address if not deploying a contract
if to != b"":
transaction["to"] = to_checksum_address(to)
signed_txn = self._client.web3.eth.account.signTransaction(
transaction, self._client.privkey)
log_details = {
"node": to_checksum_address(self._client.address),
"nonce": transaction["nonce"],
"gasLimit": transaction["gas"],
"gasPrice": transaction["gasPrice"],
}
log.debug("send_raw_transaction called", **log_details)
tx_hash = self._client.web3.eth.sendRawTransaction(
signed_txn.rawTransaction)
log.debug("send_raw_transaction returned",
tx_hash=encode_hex(tx_hash),
**log_details)
self._sent = True
return TransactionHash(tx_hash)
def send_transaction(self,
to: Address,
startgas: int,
value: int = 0,
data: bytes = b"") -> TransactionHash:
""" 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 == to_canonical_address(constants.NULL_ADDRESS):
warnings.warn(
"For contract creation the empty string must be used.")
with self._nonce_lock:
nonce = self._available_nonce
gas_price = self.gas_price()
transaction = {
"data": data,
"gas": startgas,
"nonce": nonce,
"value": value,
"gasPrice": gas_price,
}
node_gas_price = self.web3.eth.gasPrice
log.debug(
"Calculated gas price for transaction",
node=to_checksum_address(self.address),
calculated_gas_price=gas_price,
node_gas_price=node_gas_price,
)
# add the to address if not deploying a contract
if to != b"":
transaction["to"] = to_checksum_address(to)
signed_txn = self.web3.eth.account.signTransaction(
transaction, self.privkey)
log_details = {
"node": to_checksum_address(self.address),
"nonce": transaction["nonce"],
"gasLimit": transaction["gas"],
"gasPrice": transaction["gasPrice"],
}
log.debug("send_raw_transaction called", **log_details)
tx_hash = self.web3.eth.sendRawTransaction(
signed_txn.rawTransaction)
self._available_nonce += 1
log.debug("send_raw_transaction returned",
tx_hash=encode_hex(tx_hash),
**log_details)
return TransactionHash(tx_hash)
def make_transaction_hash() -> TransactionHash:
return TransactionHash(make_32bytes())
def action_claim_reward_triggered_event_handler(event: Event,
context: Context) -> None:
assert isinstance(event, ActionClaimRewardTriggeredEvent)
log.info("Triggering reward claim")
monitor_request = context.database.get_monitor_request(
token_network_address=event.token_network_address,
channel_id=event.channel_identifier,
non_closing_signer=event.non_closing_participant,
)
if monitor_request is None:
return
channel = context.database.get_channel(
token_network_address=monitor_request.token_network_address,
channel_id=monitor_request.channel_identifier,
)
if channel is None:
return
# check that the latest update was ours and that we didn't send a transaction yet
can_claim = (channel.claim_tx_hash is None
and channel.update_status is not None
and channel.update_status.update_sender_address
== context.ms_state.address)
log.info("Checking if eligible for reward", reward_available=can_claim)
# check if claiming will produce a reward
has_reward = monitor_request.reward_amount > 0
if not has_reward:
log.warning(
"MonitorRequest has no reward. Skipping reward claim.",
reward_amount=monitor_request.reward_amount,
monitor_request=monitor_request,
)
if can_claim and has_reward:
try:
# The gas estimation will prevent us from wasting gas on failing
# transactions. Attackers shouldn't be able to exploit this
# transaction to waste gas anyway unless there is a bug in the smart
# contract. It should not be possible to bring the contract into a
# state where MS has a reward, the contract says it is time to
# claim it, but the claim will fail.
tx_hash = TransactionHash(
bytes(
context.monitoring_service_contract.functions.claimReward(
monitor_request.channel_identifier,
monitor_request.token_network_address,
monitor_request.signer,
monitor_request.non_closing_signer,
).transact({"from": context.ms_state.address})))
log.info(
"Sent transaction calling `claimReward` for channel",
token_network_address=channel.token_network_address,
channel_identifier=channel.identifier,
transaction_hash=encode_hex(tx_hash),
)
assert tx_hash is not None
with context.database.conn:
# Add tx hash to list of waiting transactions
context.database.add_waiting_transaction(tx_hash)
channel.claim_tx_hash = tx_hash
context.database.upsert_channel(channel)
except Exception as exc: # pylint: disable=broad-except
log.error("Sending tx failed", exc_info=True, err=exc)
metrics.get_metrics_for_label(
metrics.ERRORS_LOGGED, metrics.ErrorCategory.PROTOCOL).inc()
# manually increase exception counter here because
# exception is not visible from outside
metrics.EVENTS_EXCEPTIONS_RAISED.labels(
event_type=event.__class__.__name__).inc()
def action_monitoring_triggered_event_handler(event: Event,
context: Context) -> None:
assert isinstance(event, ActionMonitoringTriggeredEvent)
log.info("Triggering channel monitoring")
monitor_request = context.database.get_monitor_request(
token_network_address=event.token_network_address,
channel_id=event.channel_identifier,
non_closing_signer=event.non_closing_participant,
)
if monitor_request is None:
log.error(
"MonitorRequest cannot be found",
token_network_address=event.token_network_address,
channel_id=event.channel_identifier,
)
metrics.get_metrics_for_label(metrics.ERRORS_LOGGED,
metrics.ErrorCategory.STATE).inc()
return
channel = context.database.get_channel(
token_network_address=monitor_request.token_network_address,
channel_id=monitor_request.channel_identifier,
)
if channel is None:
log.error("Channel cannot be found", monitor_request=monitor_request)
metrics.get_metrics_for_label(metrics.ERRORS_LOGGED,
metrics.ErrorCategory.STATE).inc()
return
if not _is_mr_valid(monitor_request, channel):
log.error(
"MonitorRequest lost its validity",
monitor_request=monitor_request,
channel=channel,
)
metrics.get_metrics_for_label(metrics.ERRORS_LOGGED,
metrics.ErrorCategory.PROTOCOL).inc()
return
last_onchain_nonce = 0
if channel.update_status:
last_onchain_nonce = channel.update_status.nonce
if monitor_request.nonce <= last_onchain_nonce:
log.info(
"Another MS submitted the last known channel state",
monitor_request=monitor_request,
)
return
latest_block = context.web3.eth.blockNumber
last_confirmed_block = context.latest_confirmed_block
user_address = monitor_request.non_closing_signer
user_deposit = get_pessimistic_udc_balance(
udc=context.user_deposit_contract,
address=user_address,
from_block=last_confirmed_block,
to_block=latest_block,
)
if monitor_request.reward_amount < context.min_reward:
log.info(
"Monitor request not executed due to insufficient reward amount",
monitor_request=monitor_request,
min_reward=context.min_reward,
)
return
if user_deposit < monitor_request.reward_amount * UDC_SECURITY_MARGIN_FACTOR_MS:
log.debug(
"User deposit is insufficient -> try monitoring again later",
monitor_request=monitor_request,
min_reward=context.min_reward,
)
context.database.upsert_scheduled_event(
ScheduledEvent(
trigger_block_number=BlockNumber(last_confirmed_block + 1),
event=event))
return
assert (channel.monitor_tx_hash is None
), "This MS already monitored this channel. Should be impossible."
try:
# Attackers might be able to construct MRs that make this fail.
# Since we execute a gas estimation before doing the `transact`,
# the gas estimation will fail before any gas is used.
# If we stop doing a gas estimation, a `call` has to be done before
# the `transact` to prevent attackers from wasting the MS's gas.
tx_hash = TransactionHash(
bytes(
context.monitoring_service_contract.functions.monitor(
monitor_request.signer,
monitor_request.non_closing_signer,
monitor_request.balance_hash,
monitor_request.nonce,
monitor_request.additional_hash,
monitor_request.closing_signature,
monitor_request.non_closing_signature,
monitor_request.reward_amount,
monitor_request.token_network_address,
monitor_request.reward_proof_signature,
).transact({"from": context.ms_state.address})))
except Exception as exc: # pylint: disable=broad-except
first_allowed = BlockNumber(
_first_allowed_block_to_monitor(event.token_network_address,
channel, context))
failed_at = context.web3.eth.blockNumber
log.error(
"Sending tx failed",
exc_info=True,
err=exc,
first_allowed=first_allowed,
failed_at=failed_at,
)
metrics.get_metrics_for_label(metrics.ERRORS_LOGGED,
metrics.ErrorCategory.BLOCKCHAIN).inc()
return
log.info(
"Sent transaction calling `monitor` for channel",
token_network_address=channel.token_network_address,
channel_identifier=channel.identifier,
transaction_hash=encode_hex(tx_hash),
)
assert tx_hash is not None
with context.database.conn:
# Add tx hash to list of waiting transactions
context.database.add_waiting_transaction(tx_hash)
channel.monitor_tx_hash = tx_hash
context.database.upsert_channel(channel)
def deserialize_transactionhash(data: str) -> TransactionHash:
return TransactionHash(deserialize_bytes(data))
def _add_token(
self,
token_address: TokenAddress,
channel_participant_deposit_limit: TokenAmount,
token_network_deposit_limit: TokenAmount,
log_details: Dict[Any, Any],
) -> Tuple[TransactionHash, TokenNetworkAddress]:
token_network_address = None
kwargs = {
"_token_address": token_address,
"_channel_participant_deposit_limit":
channel_participant_deposit_limit,
"_token_network_deposit_limit": token_network_deposit_limit,
}
estimated_transaction = self.rpc_client.estimate_gas(
self.proxy, "createERC20TokenNetwork", log_details, **kwargs)
if estimated_transaction is not None:
estimated_transaction.estimated_gas = safe_gas_limit(
estimated_transaction.estimated_gas,
self.gas_measurements[
"TokenNetworkRegistry createERC20TokenNetwork"],
)
transaction_sent = self.rpc_client.transact(estimated_transaction)
transaction_mined = self.rpc_client.poll_transaction(
transaction_sent)
receipt = transaction_mined.receipt
if not was_transaction_successfully_mined(transaction_mined):
failed_at_blocknumber = BlockNumber(receipt["blockNumber"])
max_token_networks = self.get_max_token_networks(
block_identifier=failed_at_blocknumber)
token_networks_created = self.get_token_network_created(
block_identifier=failed_at_blocknumber)
already_registered = self.get_token_network(
token_address=token_address,
block_identifier=failed_at_blocknumber)
deprecation_executor = self.get_deprecation_executor(
block_identifier=failed_at_blocknumber)
settlement_timeout_min = self.settlement_timeout_min(
block_identifier=failed_at_blocknumber)
settlement_timeout_max = self.settlement_timeout_max(
block_identifier=failed_at_blocknumber)
chain_id = self.get_chain_id(
block_identifier=failed_at_blocknumber)
secret_registry_address = self.get_secret_registry_address(
block_identifier=failed_at_blocknumber)
try:
# Creating a new instance to run the constructor checks.
token_proxy = Token(
jsonrpc_client=self.rpc_client,
token_address=token_address,
contract_manager=self.proxy_manager.contract_manager,
block_identifier=failed_at_blocknumber,
)
except AddressWithoutCode:
# This cannot be an unrecoverable error, since the ERC20
# code is external.
raise RaidenRecoverableError(
"Token disappeared! The address "
f"{to_checksum_address(token_address)} did have code at "
f"block {log_details['given_block_identifier']}, however "
f"at block {failed_at_blocknumber} when the registration "
"transaction was mined the address didn't have code "
"anymore.")
check_transaction_failure(transaction_mined, self.rpc_client)
check_address_has_code_handle_pruned_block(
client=self.rpc_client,
address=Address(secret_registry_address),
contract_name=CONTRACT_SECRET_REGISTRY,
expected_code=decode_hex(
self.proxy_manager.contract_manager.
get_runtime_hexcode(CONTRACT_SECRET_REGISTRY)),
given_block_identifier=failed_at_blocknumber,
)
if token_networks_created >= max_token_networks:
raise RaidenRecoverableError(
"The number of existing token networks reached the maximum allowed"
)
if already_registered:
# Race condition lost, the token network was created in a different
# transaction which got mined first.
raise RaidenRecoverableError(
"The token was already registered in the TokenNetworkRegistry."
)
if deprecation_executor == NULL_ADDRESS_BYTES:
raise RaidenUnrecoverableError(
"The deprecation executor property for the "
"TokenNetworkRegistry is invalid.")
if chain_id == 0:
raise RaidenUnrecoverableError(
"The chain ID property for the TokenNetworkRegistry is invalid."
)
if chain_id != self.rpc_client.chain_id:
raise RaidenUnrecoverableError(
f"The provided chain ID {chain_id} does not match the "
f"network Raiden is running on: {self.rpc_client.chain_id}."
)
if secret_registry_address == NULL_ADDRESS_BYTES:
raise RaidenUnrecoverableError(
"The secret registry address for the token network is invalid."
)
if settlement_timeout_min == 0:
raise RaidenUnrecoverableError(
"The minimum settlement timeout for the token network "
"should be larger than zero.")
if settlement_timeout_max <= settlement_timeout_min:
raise RaidenUnrecoverableError(
"The maximum settlement timeout for the token network "
"should be larger than the minimum settlement timeout."
)
total_supply = token_proxy.total_supply(
block_identifier=failed_at_blocknumber)
if not total_supply or total_supply <= 0:
raise RaidenRecoverableError(
f"The given token address is not a valid ERC20 token, "
f"total_supply() returned an invalid value {total_supply}."
)
# At this point, the TokenNetworkRegistry fails to instantiate
# a new TokenNetwork.
raise RaidenUnrecoverableError(
"createERC20TokenNetwork failed for an unknown reason, even "
"though the gas estimation succeeded.")
succeeded_at_blockhash = receipt["blockHash"]
token_network_address = self.get_token_network(
token_address, succeeded_at_blockhash)
if token_network_address is None:
msg = "createERC20TokenNetwork succeeded but token network address is Null"
raise RaidenUnrecoverableError(msg)
else: # `estimated_transaction` is None
# The latest block can not be used reliably because of reorgs,
# therefore every call using this block has to handle pruned data.
failed_at_block = self.rpc_client.get_block(BLOCK_ID_LATEST)
failed_at_blockhash = failed_at_block["hash"].hex()
failed_at_blocknumber = failed_at_block["number"]
max_token_networks = self.get_max_token_networks(
block_identifier=failed_at_blocknumber)
token_networks_created = self.get_token_network_created(
block_identifier=failed_at_blocknumber)
already_registered = self.get_token_network(
token_address=token_address,
block_identifier=failed_at_blocknumber)
deprecation_executor = self.get_deprecation_executor(
block_identifier=failed_at_blocknumber)
settlement_timeout_min = self.settlement_timeout_min(
block_identifier=failed_at_blocknumber)
settlement_timeout_max = self.settlement_timeout_max(
block_identifier=failed_at_blocknumber)
chain_id = self.get_chain_id(
block_identifier=failed_at_blocknumber)
secret_registry_address = self.get_secret_registry_address(
block_identifier=failed_at_blocknumber)
try:
# Creating a new instance to run the constructor checks.
token_proxy = Token(
jsonrpc_client=self.rpc_client,
token_address=token_address,
contract_manager=self.proxy_manager.contract_manager,
block_identifier=failed_at_blocknumber,
)
except AddressWithoutCode:
# This cannot be an unrecoverable error, since the ERC20
# code is external.
raise RaidenRecoverableError(
"Token disappeared! The address "
"{to_checksum_address(token_address)} did have code at "
"block {log_details['given_block_identifier']}, however "
"at block {failed_at_blocknumber} when the registration "
"transaction was mined the address didn't have code "
"anymore.")
check_address_has_code_handle_pruned_block(
client=self.rpc_client,
address=Address(secret_registry_address),
contract_name=CONTRACT_SECRET_REGISTRY,
expected_code=decode_hex(
self.proxy_manager.contract_manager.get_runtime_hexcode(
CONTRACT_SECRET_REGISTRY)),
given_block_identifier=failed_at_blocknumber,
)
required_gas = self.gas_measurements[
"TokenNetworkRegistry createERC20TokenNetwork"]
self.rpc_client.check_for_insufficient_eth(
transaction_name="createERC20TokenNetwork",
transaction_executed=False,
required_gas=required_gas,
block_identifier=failed_at_blocknumber,
)
if token_networks_created >= max_token_networks:
raise RaidenRecoverableError(
"The number of existing token networks reached the maximum allowed"
)
if already_registered:
# Race condition lost, the token network was created in a different
# transaction which got mined first.
raise RaidenRecoverableError(
"The token was already registered in the TokenNetworkRegistry."
)
if deprecation_executor == NULL_ADDRESS_BYTES:
raise RaidenUnrecoverableError(
"The deprecation executor property for the TokenNetworkRegistry is invalid."
)
if chain_id == 0:
raise RaidenUnrecoverableError(
"The chain ID property for the TokenNetworkRegistry is invalid."
)
if chain_id != self.rpc_client.chain_id:
raise RaidenUnrecoverableError(
f"The provided chain ID {chain_id} does not match the "
f"network Raiden is running on: {self.rpc_client.chain_id}."
)
if secret_registry_address == NULL_ADDRESS_BYTES:
raise RaidenUnrecoverableError(
"The secret registry address for the token network is invalid."
)
if settlement_timeout_min <= 0:
raise RaidenUnrecoverableError(
"The minimum settlement timeout for the token network "
"should be larger than zero.")
if settlement_timeout_max <= settlement_timeout_min:
raise RaidenUnrecoverableError(
"The maximum settlement timeout for the token network "
"should be larger than the minimum settlement timeout.")
total_supply = token_proxy.total_supply(
block_identifier=failed_at_blocknumber)
if not total_supply or total_supply <= 0:
raise RaidenRecoverableError(
f"The given token address is not a valid ERC20 token, "
f"total_supply() returned an invalid value {total_supply}."
)
# At this point, the TokenNetworkRegistry fails to instantiate
# a new TokenNetwork.
raise RaidenUnrecoverableError(
f"createERC20TokenNetwork gas estimation failed for an unknown "
f"reason. Reference block {failed_at_blockhash} "
f"{failed_at_blocknumber}.")
return (
TransactionHash(transaction_mined.transaction_hash),
TokenNetworkAddress(token_network_address),
)
GOERLI = 5
KOVAN = 42
SMOKETEST = 627
# Set at 64 since parity's default is 64 and Geth's default is 128
# TODO: Make this configurable. Since in parity this is also a configurable value
STATE_PRUNING_AFTER_BLOCKS = 64
STATE_PRUNING_SAFETY_MARGIN = 8
NO_STATE_QUERY_AFTER_BLOCKS = STATE_PRUNING_AFTER_BLOCKS - STATE_PRUNING_SAFETY_MARGIN
NULL_ADDRESS_BYTES = bytes(20)
NULL_ADDRESS = to_checksum_address(NULL_ADDRESS_BYTES)
EMPTY_HASH = BlockHash(bytes(32))
EMPTY_TRANSACTION_HASH = TransactionHash(bytes(32))
EMPTY_BALANCE_HASH = BalanceHash(bytes(32))
EMPTY_MESSAGE_HASH = AdditionalHash(bytes(32))
EMPTY_SIGNATURE = Signature(bytes(65))
EMPTY_SECRET = Secret(bytes(32))
EMPTY_SECRETHASH = SecretHash(bytes(32))
EMPTY_SECRET_SHA256 = sha256_secrethash(EMPTY_SECRET)
LOCKSROOT_OF_NO_LOCKS = Locksroot(keccak(b""))
ZERO_TOKENS = TokenAmount(0)
ABSENT_SECRET = Secret(b"")
SECRET_LENGTH = 32
SECRETHASH_LENGTH = 32
RECEIPT_FAILURE_CODE = 0
def decode_raiden_event_to_internal(
abi: ABI, chain_id: ChainID, log_event: LogReceipt
) -> DecodedEvent:
"""Enforce the sandwich encoding. Converts the JSON RPC/web3 data types
to the internal representation.
Note::
This function must only on confirmed data.
"""
# Note: All addresses inside the event_data must be decoded.
decoded_event = decode_event(abi, log_event)
if not decoded_event:
raise UnknownRaidenEventType()
# copy the attribute dict because that data structure is immutable
data = dict(decoded_event)
args = dict(decoded_event["args"])
data["args"] = args
# translate from web3's to raiden's name convention
data["block_number"] = log_event["blockNumber"]
data["transaction_hash"] = log_event["transactionHash"]
data["block_hash"] = bytes(log_event["blockHash"])
# Remove the old names
del data["blockNumber"]
del data["transactionHash"]
del data["blockHash"]
assert data["block_number"], "The event must have the block_number"
assert data["transaction_hash"], "The event must have the transaction hash field"
assert data["block_hash"], "The event must have the block_hash"
event = data["event"]
if event == EVENT_TOKEN_NETWORK_CREATED:
args["token_network_address"] = to_canonical_address(args["token_network_address"])
args["token_address"] = to_canonical_address(args["token_address"])
elif event == ChannelEvent.OPENED:
args["participant1"] = to_canonical_address(args["participant1"])
args["participant2"] = to_canonical_address(args["participant2"])
elif event == ChannelEvent.DEPOSIT:
args["participant"] = to_canonical_address(args["participant"])
elif event == ChannelEvent.WITHDRAW:
args["participant"] = to_canonical_address(args["participant"])
elif event == ChannelEvent.BALANCE_PROOF_UPDATED:
args["closing_participant"] = to_canonical_address(args["closing_participant"])
elif event == ChannelEvent.CLOSED:
args["closing_participant"] = to_canonical_address(args["closing_participant"])
elif event == ChannelEvent.UNLOCKED:
args["receiver"] = to_canonical_address(args["receiver"])
args["sender"] = to_canonical_address(args["sender"])
return DecodedEvent(
chain_id=chain_id,
originating_contract=to_canonical_address(log_event["address"]),
event_data=data,
block_number=log_event["blockNumber"],
block_hash=BlockHash(log_event["blockHash"]),
transaction_hash=TransactionHash(log_event["transactionHash"]),
)
def action_monitoring_triggered_event_handler(event: Event,
context: Context) -> None:
assert isinstance(event, ActionMonitoringTriggeredEvent)
log.info("Triggering channel monitoring")
monitor_request = context.db.get_monitor_request(
token_network_address=event.token_network_address,
channel_id=event.channel_identifier,
non_closing_signer=event.non_closing_participant,
)
if monitor_request is None:
return
channel = context.db.get_channel(
token_network_address=monitor_request.token_network_address,
channel_id=monitor_request.channel_identifier,
)
if channel is None:
return
if not _is_mr_valid(monitor_request, channel):
return
last_onchain_nonce = 0
if channel.update_status:
last_onchain_nonce = channel.update_status.nonce
user_address = monitor_request.non_closing_signer
user_deposit = context.user_deposit_contract.functions.effectiveBalance(
user_address).call()
if monitor_request.reward_amount < context.min_reward:
log.info(
"Monitor request not executed due to insufficient reward amount",
monitor_request=monitor_request,
min_reward=context.min_reward,
)
call_monitor = (channel.closing_tx_hash is None
and monitor_request.nonce > last_onchain_nonce
and user_deposit >=
monitor_request.reward_amount * DEFAULT_PAYMENT_RISK_FAKTOR
and monitor_request.reward_amount >= context.min_reward)
if call_monitor:
try:
# Attackers might be able to construct MRs that make this fail.
# Since we execute a gas estimation before doing the `transact`,
# the gas estimation will fail before any gas is used.
# If we stop doing a gas estimation, a `call` has to be done before
# the `transact` to prevent attackers from wasting the MS's gas.
tx_hash = TransactionHash(
bytes(
context.monitoring_service_contract.functions.monitor(
monitor_request.signer,
monitor_request.non_closing_signer,
monitor_request.balance_hash,
monitor_request.nonce,
monitor_request.additional_hash,
monitor_request.closing_signature,
monitor_request.non_closing_signature,
monitor_request.reward_amount,
monitor_request.token_network_address,
monitor_request.reward_proof_signature,
).transact({"from": context.ms_state.address})))
log.info(
"Sent transaction calling `monitor` for channel",
token_network_address=channel.token_network_address,
channel_identifier=channel.identifier,
transaction_hash=encode_hex(tx_hash),
)
assert tx_hash is not None
with context.db.conn:
# Add tx hash to list of waiting transactions
context.db.add_waiting_transaction(tx_hash)
channel.closing_tx_hash = tx_hash
context.db.upsert_channel(channel)
except Exception as exc: # pylint: disable=broad-except
log.error("Sending tx failed", exc_info=True, err=exc)
def get_waiting_transactions(self) -> List[TransactionHash]:
return [
TransactionHash(decode_hex(row[0])) for row in self.conn.execute(
"SELECT transaction_hash FROM waiting_transactions")
]
def action_claim_reward_triggered_event_handler(event: Event,
context: Context) -> None:
assert isinstance(event, ActionClaimRewardTriggeredEvent)
log.info("Triggering reward claim")
monitor_request = context.db.get_monitor_request(
token_network_address=event.token_network_address,
channel_id=event.channel_identifier,
non_closing_signer=event.non_closing_participant,
)
if monitor_request is None:
return
channel = context.db.get_channel(
token_network_address=monitor_request.token_network_address,
channel_id=monitor_request.channel_identifier,
)
if channel is None:
return
# check that the latest update was ours and that we didn't send a transaction yet
can_claim = (channel is not None and channel.claim_tx_hash is None
and channel.update_status is not None
and channel.update_status.update_sender_address
== context.ms_state.address)
log.info("Checking if eligible for reward", reward_available=can_claim)
# check if claiming will produce a reward
has_reward = monitor_request.reward_amount > 0
if not has_reward:
log.warning(
"MonitorRequest has no reward. Skipping reward claim.",
reward_amount=monitor_request.reward_amount,
monitor_request=monitor_request,
)
if can_claim and has_reward:
try:
tx_hash = TransactionHash(
bytes(
context.monitoring_service_contract.functions.claimReward(
monitor_request.channel_identifier,
monitor_request.token_network_address,
monitor_request.signer,
monitor_request.non_closing_signer,
).transact({"from": context.ms_state.address})))
log.info(
"Sent transaction calling `claimReward` for channel",
token_network_address=channel.token_network_address,
channel_identifier=channel.identifier,
transaction_hash=encode_hex(tx_hash),
)
assert tx_hash is not None
with context.db.conn:
# Add tx hash to list of waiting transactions
context.db.add_waiting_transaction(tx_hash)
channel.claim_tx_hash = tx_hash
context.db.upsert_channel(channel)
except Exception as exc: # pylint: disable=broad-except
log.error("Sending tx failed", exc_info=True, err=exc)