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111 lines
3.9 KiB
111 lines
3.9 KiB
""" A bitcoind proxy that allows instrumentation and canned responses
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"""
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from flask import Flask, request
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from bitcoin.rpc import JSONRPCError # type: ignore
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from bitcoin.rpc import RawProxy as BitcoinProxy # type: ignore
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from cheroot.wsgi import Server # type: ignore
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from cheroot.wsgi import PathInfoDispatcher # type: ignore
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import decimal
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import flask
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import json
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import logging
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import threading
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class DecimalEncoder(json.JSONEncoder):
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"""By default json.dumps does not handle Decimals correctly, so we override it's handling
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"""
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def default(self, o):
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if isinstance(o, decimal.Decimal):
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return "{:.8f}".format(float(o))
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return super(DecimalEncoder, self).default(o)
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class BitcoinRpcProxy(object):
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def __init__(self, bitcoind, rpcport=0):
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self.app = Flask("BitcoindProxy")
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self.app.add_url_rule("/", "API entrypoint", self.proxy, methods=['POST'])
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self.rpcport = rpcport
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self.mocks = {}
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self.mock_counts = {}
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self.bitcoind = bitcoind
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self.request_count = 0
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def _handle_request(self, r):
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brpc = BitcoinProxy(btc_conf_file=self.bitcoind.conf_file)
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method = r['method']
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# If we have set a mock for this method reply with that instead of
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# forwarding the request.
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if method in self.mocks and type(self.mocks[method]) == dict:
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ret = {}
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ret['id'] = r['id']
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ret['error'] = None
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ret['result'] = self.mocks[method]
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self.mock_counts[method] += 1
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return ret
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elif method in self.mocks and callable(self.mocks[method]):
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self.mock_counts[method] += 1
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return self.mocks[method](r)
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try:
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reply = {
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"result": brpc._call(r['method'], *r['params']),
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"error": None,
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"id": r['id']
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}
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except JSONRPCError as e:
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reply = {
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"error": e.error,
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"code": -32603,
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"id": r['id']
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}
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self.request_count += 1
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return reply
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def proxy(self):
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r = json.loads(request.data.decode('ASCII'))
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if isinstance(r, list):
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reply = [self._handle_request(subreq) for subreq in r]
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else:
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reply = self._handle_request(r)
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response = flask.Response(json.dumps(reply, cls=DecimalEncoder))
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response.headers['Content-Type'] = 'application/json'
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return response
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def start(self):
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d = PathInfoDispatcher({'/': self.app})
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self.server = Server(('0.0.0.0', self.rpcport), d)
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self.proxy_thread = threading.Thread(target=self.server.start)
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self.proxy_thread.daemon = True
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self.proxy_thread.start()
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# Now that bitcoind is running on the real rpcport, let's tell all
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# future callers to talk to the proxyport. We use the bind_addr as a
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# signal that the port is bound and accepting connections.
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while self.server.bind_addr[1] == 0:
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pass
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self.rpcport = self.server.bind_addr[1]
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logging.debug("BitcoinRpcProxy proxying incoming port {} to {}".format(self.rpcport, self.bitcoind.rpcport))
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def stop(self):
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self.server.stop()
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self.proxy_thread.join()
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logging.debug("BitcoinRpcProxy shut down after processing {} requests".format(self.request_count))
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def mock_rpc(self, method, response=None):
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"""Mock the response to a future RPC call of @method
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The response can either be a dict with the full JSON-RPC response, or a
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function that returns such a response. If the response is None the mock
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is removed and future calls will be passed through to bitcoind again.
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"""
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if response is not None:
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self.mocks[method] = response
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self.mock_counts[method] = 0
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elif method in self.mocks:
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del self.mocks[method]
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