async def blockchain_transaction_get_merkle(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.transaction.get_merkle
Return the merkle branch to a confirmed transaction given its
hash and height.
"""
if "params" not in query or len(query["params"]) != 2:
return JsonRPCError.invalidparams()
tx_hash = query["params"][0]
height = query["params"][1]
if not is_hash256_str(tx_hash):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(height):
return JsonRPCError.invalidparams()
_ec, hashes = await self.bx.fetch_block_transaction_hashes(height)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
# Decouple from tuples
hashes = [i[0] for i in hashes]
tx_pos = hashes.index(unhexlify(tx_hash)[::-1])
branch = merkle_branch(hashes, tx_pos)
res = {
"block_height": int(height),
"pos": int(tx_pos),
"merkle": branch,
}
return {"result": res}
async def blockchain_scripthash_listunspent(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.listunspent
Return an ordered list of UTXOs sent to a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
scripthash = query["params"][0]
if not is_hash256_str(scripthash):
return JsonRPCError.invalidparams()
_ec, utxo = await self.bx.fetch_utxo(scripthash)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
# TODO: Check mempool
ret = []
for i in utxo:
rec = i["received"]
ret.append({
"tx_pos": rec["index"],
"value": i["value"],
"tx_hash": hash_to_hex_str(rec["hash"]),
"height": rec["height"],
})
if len(ret) >= 2:
ret.reverse()
return {"result": ret}
async def scripthash_listunspent(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.listunspent
Return an ordered list of UTXOs sent to a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
scripthash = query["params"][0]
if not is_hash256_str(scripthash):
return JsonRPCError.invalidparams()
_ec, utxo = await self.bx.fetch_utxo(scripthash)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_utxo: %s", _ec.name)
return JsonRPCError.internalerror()
ret = []
for i in utxo:
rec = i["received"]
ret.append({
"tx_pos":
rec["index"],
"value":
i["value"],
"tx_hash":
hash_to_hex_str(rec["hash"]),
"height":
rec["height"] if rec["height"] != 4294967295 else 0,
})
return {"result": ret}
async def scripthash_subscribe(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.subscribe
Subscribe to a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
scripthash = query["params"][0]
if not is_hash256_str(scripthash):
return JsonRPCError.invalidparams()
_ec, history = await self.bx.fetch_history4(scripthash)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_history4: %s", _ec.name)
return JsonRPCError.internalerror()
# TODO: Check how history4 acts for mempool/unconfirmed
status = ElectrumProtocol.__scripthash_status_from_history(history)
self.peers[self._get_peer(writer)]["sh"][scripthash] = {
"status": status
}
task = asyncio.create_task(self.scripthash_notifier(
writer, scripthash))
self.peers[self._get_peer(writer)]["sh"][scripthash]["task"] = task
if len(history) < 1:
return {"result": None}
return {"result": ElectrumProtocol.__scripthash_status_encode(status)}
async def estimatefee(self, writer, query): # pylint: disable=W0613,disable=R0911
"""Method: blockchain.estimatefee
Return the estimated transaction fee per kilobyte for a transaction
to be confirmed within a certain number of blocks.
"""
# NOTE: This solution is using the mempool.space API.
# Let's try to eventually solve it with some internal logic.
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
num_blocks = query["params"][0]
if not is_non_negative_integer(num_blocks):
return JsonRPCError.invalidparams()
if self.chain == "testnet":
return {"result": 0.00001}
fee_dict = get_mempool_fee_estimates()
if not fee_dict:
return {"result": -1}
# Good enough.
if num_blocks < 3:
return {"result": "{:.8f}".format(fee_dict["fastestFee"] / 100000)}
if num_blocks < 6:
return {
"result": "{:.8f}".format(fee_dict["halfHourFee"] / 100000)
}
if num_blocks < 10:
return {"result": "{:.8f}".format(fee_dict["hourFee"] / 100000)}
return {"result": "{:.8f}".format(fee_dict["minimumFee"] / 100000)}
async def blockchain_scripthash_get_history(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.get_history
Return the confirmed and unconfirmed history of a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
if not is_hash256_str(query["params"][0]):
return JsonRPCError.invalidparams()
_ec, data = await self.bx.fetch_history4(query["params"][0])
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
self.log.debug("hist: %s", data)
ret = []
# TODO: mempool
for i in data:
if "received" in i:
ret.append({
"height": i["received"]["height"],
"tx_hash": hash_to_hex_str(i["received"]["hash"]),
})
if "spent" in i:
ret.append({
"height": i["spent"]["height"],
"tx_hash": hash_to_hex_str(i["spent"]["hash"]),
})
return {"result": ret}
async def block_header(self, writer, query): # pylint: disable=W0613,R0911
"""Method: blockchain.block.header
Return the block header at the given height.
"""
if "params" not in query or len(query["params"]) < 1:
return JsonRPCError.invalidparams()
index = query["params"][0]
cp_height = query["params"][1] if len(query["params"]) == 2 else 0
if not is_non_negative_integer(index):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(cp_height):
return JsonRPCError.invalidparams()
if cp_height != 0 and not index <= cp_height:
return JsonRPCError.invalidparams()
if cp_height == 0:
_ec, header = await self.bx.fetch_block_header(index)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_block_header: %s", _ec.name)
return JsonRPCError.internalerror()
return {"result": safe_hexlify(header)}
res = await self._merkle_proof_for_headers(cp_height, index)
return {"result": res}
async def blockchain_transaction_get(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.transaction.get
Return a raw transaction.
"""
if "params" not in query or len(query["params"]) < 1:
return JsonRPCError.invalidparams()
tx_hash = query["params"][0]
verbose = query["params"][1] if len(query["params"]) > 1 else False
# _ec, rawtx = await self.bx.fetch_blockchain_transaction(tx_hash)
_ec, rawtx = await self.bx.fetch_mempool_transaction(tx_hash)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
# Behaviour is undefined in spec
if not rawtx:
return {"result": None}
if verbose:
# TODO: Help needed
return JsonRPCError.invalidrequest()
return {"result": bh2u(rawtx)}
async def handle_query(self, writer, query): # pylint: disable=R0915,R0912,R0911
"""Electrum protocol method handler mapper"""
if "method" not in query or "id" not in query:
return await self._send_reply(writer,
JsonRPCError.invalidrequest(), None)
method = query["method"]
func = self.methodmap.get(method)
if not func:
self.log.error("Unhandled method %s, query=%s", method, query)
return await self._send_reply(writer,
JsonRPCError.methodnotfound(), query)
resp = await func(writer, query)
return await self._send_reply(writer, resp, query)
async def test_server_version(protocol, writer, method):
params = ["obelisk 42", [SERVER_PROTO_MIN, SERVER_PROTO_MAX]]
expect = {"result": [f"obelisk {VERSION}", SERVER_PROTO_MAX]}
data = await protocol.server_version(writer, {"params": params})
assert_equal(data["result"], expect["result"])
params = ["obelisk", "0.0"]
expect = JsonRPCError.protonotsupported()
data = await protocol.server_version(writer, {"params": params})
assert_equal(data, expect)
params = ["obelisk"]
expect = JsonRPCError.invalidparams()
data = await protocol.server_version(writer, {"params": params})
assert_equal(data, expect)
async def test_transaction_get_merkle(protocol, writer, method):
params = [
[
"a9c3c22cc2589284288b28e802ea81723d649210d59dfa7e03af00475f4cec20",
1970700,
],
]
for i in params:
expect = get_expect(method, i)
data = await protocol.transaction_get_merkle(writer, {"params": i})
assert_equal(data["result"], expect["result"])
params = [
[],
["foo", 1],
[3, 1],
[
"a9c3c22cc2589284288b28e802ea81723d649210d59dfa7e03af00475f4cec20",
-4,
],
[
"a9c3c22cc2589284288b28e802ea81723d649210d59dfa7e03af00475f4cec20",
"foo",
],
]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.transaction_get_merkle(writer, {"params": i})
assert_equal(data, expect)
async def test_scripthash_listunspent(protocol, writer, method):
params = [
["c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921"],
["92dd1eb7c042956d3dd9185a58a2578f61fee91347196604540838ccd0f8c08c"],
["b97b504af8fcf94a47d3ae5a346d38220f0751732d9b89a413568bfbf4b36ec6"],
]
for i in params:
# Blockstream is broken here and doesn't return in ascending order.
expect = get_expect(method, i)
srt = sorted(expect["result"], key=lambda x: x["height"])
data = await protocol.scripthash_listunspent(writer, {"params": i})
assert_equal(data["result"], srt)
params = [
[],
["foobar"],
[
"c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921",
42,
],
]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.scripthash_listunspent(writer, {"params": i})
assert_equal(data, expect)
async def scripthash_get_balance(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.get_balance
Return the confirmed and unconfirmed balances of a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
if not is_hash256_str(query["params"][0]):
return JsonRPCError.invalidparams()
_ec, data = await self.bx.fetch_balance(query["params"][0])
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_balance: %s", _ec.name)
return JsonRPCError.internalerror()
ret = {"confirmed": data[0], "unconfirmed": data[1]}
return {"result": ret}
async def blockchain_headers_subscribe(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.headers.subscribe
Subscribe to receive block headers when a new block is found.
"""
# Tip height and header are returned upon request
_ec, height = await self.bx.fetch_last_height()
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
_ec, tip_header = await self.bx.fetch_block_header(height)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
self.tasks.append(asyncio.create_task(self.header_notifier(writer)))
ret = {"height": height, "hex": safe_hexlify(tip_header)}
return {"result": ret}
async def blockchain_scripthash_get_balance(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.get_balance
Return the confirmed and unconfirmed balances of a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
if not is_hash256_str(query["params"][0]):
return JsonRPCError.invalidparams()
_ec, data = await self.bx.fetch_balance(query["params"][0])
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
# TODO: confirmed/unconfirmed, see what's happening in libbitcoin
ret = {"confirmed": data, "unconfirmed": 0}
return {"result": ret}
async def headers_subscribe(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.headers.subscribe
Subscribe to receive block headers when a new block is found.
"""
# Tip height and header are returned upon request
_ec, height = await self.bx.fetch_last_height()
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_last_height: %s", _ec.name)
return JsonRPCError.internalerror()
_ec, tip_header = await self.bx.fetch_block_header(height)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_block_header: %s", _ec.name)
return JsonRPCError.internalerror()
self.peers[self._get_peer(writer)]["tasks"].append(
asyncio.create_task(self.header_notifier(writer)))
ret = {"height": height, "hex": safe_hexlify(tip_header)}
return {"result": ret}
async def block_headers(self, writer, query): # pylint: disable=W0613,R0911
"""Method: blockchain.block.headers
Return a concatenated chunk of block headers from the main chain.
"""
if "params" not in query or len(query["params"]) < 2:
return JsonRPCError.invalidparams()
# Electrum doesn't allow max_chunk_size to be less than 2016
# gopher://bitreich.org/9/memecache/convenience-store.mkv
max_chunk_size = 2016
start_height = query["params"][0]
count = query["params"][1]
cp_height = query["params"][2] if len(query["params"]) == 3 else 0
if not is_non_negative_integer(start_height):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(count):
return JsonRPCError.invalidparams()
# BUG: spec says <= cp_height
if cp_height != 0 and not start_height + (count - 1) < cp_height:
return JsonRPCError.invalidparams()
count = min(count, max_chunk_size)
headers = bytearray()
for i in range(count):
_ec, data = await self.bx.fetch_block_header(start_height + i)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_block_header: %s", _ec.name)
return JsonRPCError.internalerror()
headers.extend(data)
resp = {
"hex": safe_hexlify(headers),
"count": len(headers) // 80,
"max": max_chunk_size,
}
if cp_height > 0:
data = await self._merkle_proof_for_headers(
cp_height, start_height + (len(headers) // 80) - 1)
resp["branch"] = data["branch"]
resp["root"] = data["root"]
return {"result": resp}
async def blockchain_scripthash_unsubscribe(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.unsubscribe
Unsubscribe from a script hash, preventing future notifications
if its status changes.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
scripthash = query["params"][0]
if not is_hash256_str(scripthash):
return JsonRPCError.invalidparams()
if scripthash in self.sh_subscriptions:
self.sh_subscriptions[scripthash]["task"].cancel()
await self.bx.unsubscribe_scripthash(scripthash)
del self.sh_subscriptions[scripthash]
return {"result": True}
return {"result": False}
async def server_version(self, writer, query): # pylint: disable=W0613
"""Method: server.version
Identify the client to the server and negotiate the protocol version.
"""
if "params" not in query or len(query["params"]) != 2:
return JsonRPCError.invalidparams()
client_ver = query["params"][1]
if isinstance(client_ver, list):
client_min, client_max = client_ver[0], client_ver[1]
else:
client_min = client_max = client_ver
version = min(client_max, SERVER_PROTO_MAX)
if version < max(client_min, SERVER_PROTO_MIN):
return JsonRPCError.protonotsupported()
return {"result": [f"obelisk {VERSION}", version]}
async def blockchain_transaction_broadcast(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.transaction.broadcast
Broadcast a transaction to the network.
"""
# Note: Not yet implemented in bs v4
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
hextx = query["params"][0]
if not is_hex_str(hextx):
return JsonRPCError.invalidparams()
_ec, _ = await self.bx.broadcast_transaction(unhexlify(hextx)[::-1])
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
rawtx = unhexlify(hextx)
txid = double_sha256(rawtx)
return {"result": hash_to_hex_str(txid)}
async def test_block_headers(protocol, writer, method):
params = [[123, 3], [11, 3, 14]]
for i in params:
expect = get_expect(method, i)
data = await protocol.block_headers(writer, {"params": i})
assert_equal(data["result"], expect["result"])
params = [[], [1], [-3, 1], [4, -1], [7, 4, 4]]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.block_headers(writer, {"params": i})
assert_equal(data, expect)
async def test_transaction_id_from_pos(protocol, writer, method):
params = [[1970700, 28], [1970700, 28, True]]
for i in params:
expect = get_expect(method, i)
data = await protocol.transaction_id_from_pos(writer, {"params": i})
assert_equal(data["result"], expect["result"])
params = [[123], [-1, 1], [1, -1], [3, 42, 4]]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.transaction_id_from_pos(writer, {"params": i})
assert_equal(data, expect)
async def blockchain_scripthash_subscribe(self, writer, query): # pylint: disable=W0613
"""Method: blockchain.scripthash.subscribe
Subscribe to a script hash.
"""
if "params" not in query or len(query["params"]) != 1:
return JsonRPCError.invalidparams()
scripthash = query["params"][0]
if not is_hash256_str(scripthash):
return JsonRPCError.invalidparams()
_ec, history = await self.bx.fetch_history4(scripthash)
if _ec and _ec != 0:
return JsonRPCError.internalerror()
task = asyncio.create_task(self.scripthash_notifier(writer, scripthash))
self.sh_subscriptions[scripthash] = {"task": task}
if len(history) < 1:
return {"result": None}
# TODO: Check how history4 acts for mempool/unconfirmed
status = []
for i in history:
if "received" in i:
status.append((
hash_to_hex_str(i["received"]["hash"]),
i["received"]["height"],
))
if "spent" in i:
status.append((
hash_to_hex_str(i["spent"]["hash"]),
i["spent"]["height"],
))
self.sh_subscriptions[scripthash]["status"] = status
return {"result": ElectrumProtocol.__scripthash_status(status)}
async def blockchain_block_headers(self, writer, query): # pylint: disable=W0613,R0911
"""Method: blockchain.block.headers
Return a concatenated chunk of block headers from the main chain.
"""
if "params" not in query or len(query["params"]) < 2:
return JsonRPCError.invalidparams()
# Electrum doesn't allow max_chunk_size to be less than 2016
# gopher://bitreich.org/9/memecache/convenience-store.mkv
max_chunk_size = 2016
start_height = query["params"][0]
count = query["params"][1]
cp_height = query["params"][2] if len(query["params"]) == 3 else 0
if not is_non_negative_integer(start_height):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(count):
return JsonRPCError.invalidparams()
if cp_height != 0 and not start_height + (count - 1) <= cp_height:
return JsonRPCError.invalidparams()
count = min(count, max_chunk_size)
headers = bytearray()
for i in range(count):
_ec, data = await self.bx.fetch_block_header(start_height + i)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
headers.extend(data)
resp = {
"hex": safe_hexlify(headers),
"count": len(headers) // 80,
"max": max_chunk_size,
}
# The assumption is to fetch more headers if necessary.
# TODO: Review
if cp_height > 0 and cp_height - start_height > count:
for i in range(cp_height - start_height):
_ec, data = await self.bx.fetch_block_header(start_height +
count + i)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
headers.extend(data)
if cp_height > 0:
# TODO: Review
# TODO: Is index is 0 or last elem?
hdr_lst = [headers[i:i + 80] for i in range(0, len(headers), 80)]
branch, root = merkle_branch_and_root(hdr_lst, 0)
resp["branch"] = [safe_hexlify(i) for i in branch]
resp["root"] = safe_hexlify(root)
return {"result": resp}
async def test_scripthash_unsubscribe(protocol, writer, method):
# Here blockstream doesn't even care
params = [
["92dd1eb7c042956d3dd9185a58a2578f61fee91347196604540838ccd0f8c08c"],
]
for i in params:
data = await protocol.scripthash_unsubscribe(writer, {"params": i})
assert data["result"] is True
params = [
[],
["foobar"],
[
"c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921",
42,
],
]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.scripthash_unsubscribe(writer, {"params": i})
assert_equal(data, expect)
async def test_scripthash_get_history(protocol, writer, method):
params = [
["c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921"],
["b97b504af8fcf94a47d3ae5a346d38220f0751732d9b89a413568bfbf4b36ec6"],
]
for i in params:
expect = get_expect(method, i)
data = await protocol.scripthash_get_history(writer, {"params": i})
assert_equal(data["result"], expect["result"])
params = [
[],
["foobar"],
[
"c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921",
42,
],
]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.scripthash_get_history(writer, {"params": i})
assert_equal(data, expect)
async def _merkle_proof_for_headers(self, height, idx):
"""Extremely inefficient merkle proof for headers"""
# The following works, but is extremely inefficient.
# The best solution would be to figure something out in
# libbitcoin-server
cp_headers = []
for i in range(0, height + 1):
_ec, data = await self.bx.fetch_block_header(i)
if _ec and _ec != ZMQError.success:
self.log.error("bx.fetch_block_header: %s", _ec.name)
return JsonRPCError.internalerror()
cp_headers.append(data)
branch, root = merkle_branch_and_root(
[double_sha256(i) for i in cp_headers], idx)
return {
"branch": [hash_to_hex_str(i) for i in branch],
"header": safe_hexlify(cp_headers[idx]),
"root": hash_to_hex_str(root),
}
async def test_scripthash_get_balance(protocol, writer, method):
params = [
["c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921"],
["92dd1eb7c042956d3dd9185a58a2578f61fee91347196604540838ccd0f8c08c"],
["b97b504af8fcf94a47d3ae5a346d38220f0751732d9b89a413568bfbf4b36ec6"],
]
for i in params:
expect = get_expect(method, i)
data = await protocol.scripthash_get_balance(writer, {"params": i})
assert_equal(data["result"], expect["result"])
params = [
[],
["foobar"],
[
"c036b0ff3ad79662cd517cd5fe1fa0af07377b9262d16f276f11ced69aaa6921",
42,
],
]
for i in params:
expect = JsonRPCError.invalidparams()
data = await protocol.scripthash_get_balance(writer, {"params": i})
assert_equal(data, expect)
async def blockchain_block_header(self, writer, query): # pylint: disable=W0613,R0911
"""Method: blockchain.block.header
Return the block header at the given height.
"""
if "params" not in query or len(query["params"]) < 1:
return JsonRPCError.invalidparams()
index = query["params"][0]
cp_height = query["params"][1] if len(query["params"]) == 2 else 0
if not is_non_negative_integer(index):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(cp_height):
return JsonRPCError.invalidparams()
if cp_height != 0 and not index <= cp_height:
return JsonRPCError.invalidparams()
if cp_height == 0:
_ec, header = await self.bx.fetch_block_header(index)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
return {"result": safe_hexlify(header)}
cp_headers = []
# headers up to and including cp_height
for i in range(index, cp_height + 1):
_ec, data = await self.bx.fetch_block_header(i)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
cp_headers.append(data)
# TODO: Review
# TODO: Is index is 0 or last elem?
branch, root = merkle_branch_and_root(cp_headers, 0)
return {
"result": {
"branch": [safe_hexlify(i) for i in branch],
"header": safe_hexlify(cp_headers[0]),
"root": safe_hexlify(root),
}
}
async def blockchain_transaction_id_from_pos(self, writer, query): # pylint: disable=R0911,W0613
"""Method: blockchain.transaction.id_from_pos
Return a transaction hash and optionally a merkle proof, given a
block height and a position in the block.
"""
if "params" not in query or len(query["params"]) < 2:
return JsonRPCError.invalidparams()
height = query["params"][0]
tx_pos = query["params"][1]
merkle = query["params"][2] if len(query["params"]) > 2 else False
if not is_non_negative_integer(height):
return JsonRPCError.invalidparams()
if not is_non_negative_integer(tx_pos):
return JsonRPCError.invalidparams()
if not is_boolean(merkle):
return JsonRPCError.invalidparams()
_ec, hashes = await self.bx.fetch_block_transaction_hashes(height)
if _ec and _ec != 0:
self.log.debug("Got error: %s", repr(_ec))
return JsonRPCError.internalerror()
if len(hashes) - 1 < tx_pos:
return JsonRPCError.internalerror()
# Decouple from tuples
hashes = [i[0] for i in hashes]
txid = hash_to_hex_str(hashes[tx_pos])
if not merkle:
return {"result": txid}
branch = merkle_branch(hashes, tx_pos)
return {"result": {"tx_hash": txid, "merkle": branch}}