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processor.py
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processor.py
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import json
import Queue as queue
import socket
import threading
import time
import traceback
import sys
from utils import random_string, timestr, print_log
class Shared:
def __init__(self, config):
self.lock = threading.Lock()
self._stopped = False
self.config = config
def stop(self):
print_log("Stopping Stratum")
with self.lock:
self._stopped = True
def stopped(self):
with self.lock:
return self._stopped
class Processor(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = True
self.dispatcher = None
self.queue = queue.Queue()
def process(self, request):
pass
def add_request(self, request):
self.queue.put(request)
def push_response(self, response):
#print "response", response
self.dispatcher.request_dispatcher.push_response(response)
def run(self):
while not self.shared.stopped():
request = self.queue.get(10000000000)
try:
self.process(request)
except:
traceback.print_exc(file=sys.stdout)
print_log("processor terminating")
class Dispatcher:
def __init__(self, config):
self.shared = Shared(config)
self.request_dispatcher = RequestDispatcher(self.shared)
self.request_dispatcher.start()
self.response_dispatcher = \
ResponseDispatcher(self.shared, self.request_dispatcher)
self.response_dispatcher.start()
def register(self, prefix, processor):
processor.dispatcher = self
processor.shared = self.shared
processor.start()
self.request_dispatcher.processors[prefix] = processor
class RequestDispatcher(threading.Thread):
def __init__(self, shared):
self.shared = shared
threading.Thread.__init__(self)
self.daemon = True
self.request_queue = queue.Queue()
self.response_queue = queue.Queue()
self.internal_ids = {}
self.internal_id = 1
self.lock = threading.Lock()
self.sessions = []
self.processors = {}
def push_response(self, item):
self.response_queue.put(item)
def pop_response(self):
return self.response_queue.get()
def push_request(self, session, item):
self.request_queue.put((session, item))
def pop_request(self):
return self.request_queue.get()
def get_session_by_address(self, address):
for x in self.sessions:
if x.address == address:
return x
def get_session_id(self, internal_id):
with self.lock:
return self.internal_ids.pop(internal_id)
def store_session_id(self, session, msgid):
with self.lock:
self.internal_ids[self.internal_id] = session, msgid
r = self.internal_id
self.internal_id += 1
return r
def run(self):
if self.shared is None:
raise TypeError("self.shared not set in Processor")
while not self.shared.stopped():
session, request = self.pop_request()
try:
self.do_dispatch(session, request)
except:
traceback.print_exc(file=sys.stdout)
self.stop()
def stop(self):
pass
def do_dispatch(self, session, request):
""" dispatch request to the relevant processor """
method = request['method']
params = request.get('params', [])
suffix = method.split('.')[-1]
if session is not None:
is_new = session.protocol_version >= 0.5
if suffix == 'subscribe':
session.subscribe_to_service(method, params)
# store session and id locally
request['id'] = self.store_session_id(session, request['id'])
prefix = request['method'].split('.')[0]
try:
p = self.processors[prefix]
except:
print_log("error: no processor for", prefix)
return
p.add_request(request)
if method in ['server.version']:
session.version = params[0]
try:
session.protocol_version = float(params[1])
except:
pass
#if session.protocol_version < 0.6:
# print_log("stopping session from old client", session.protocol_version)
# session.stop()
def get_sessions(self):
with self.lock:
r = self.sessions[:]
return r
def add_session(self, session):
with self.lock:
self.sessions.append(session)
def collect_garbage(self):
# Deep copy entire sessions list and blank it
# This is done to minimise lock contention
with self.lock:
sessions = self.sessions[:]
self.sessions = []
for session in sessions:
if not session.stopped():
# If session is still alive then re-add it back
# to our internal register
self.add_session(session)
class Session:
def __init__(self):
self._stopped = False
self.lock = threading.Lock()
self.subscriptions = []
self.address = ''
self.name = ''
self.version = 'unknown'
self.protocol_version = 0.
self.time = time.time()
threading.Timer(2, self.info).start()
# Debugging method. Doesn't need to be threadsafe.
def info(self):
for sub in self.subscriptions:
#print sub
method = sub[0]
if method == 'blockchain.address.subscribe':
addr = sub[1]
break
else:
addr = None
if self.subscriptions:
print_log("%4s" % self.name,
"%15s" % self.address,
"%35s" % addr,
"%3d" % len(self.subscriptions),
self.version)
def stopped(self):
with self.lock:
return self._stopped
def subscribe_to_service(self, method, params):
subdesc = self.build_subdesc(method, params)
with self.lock:
if subdesc is not None:
self.subscriptions.append(subdesc)
# subdesc = A subscription description
@staticmethod
def build_subdesc(method, params):
if method == "blockchain.numblocks.subscribe":
return method,
elif method == "blockchain.headers.subscribe":
return method,
elif method in ["blockchain.address.subscribe"]:
if not params:
return None
else:
return method, params[0]
else:
return None
def contains_subscription(self, subdesc):
with self.lock:
return subdesc in self.subscriptions
class ResponseDispatcher(threading.Thread):
def __init__(self, shared, request_dispatcher):
self.shared = shared
self.request_dispatcher = request_dispatcher
threading.Thread.__init__(self)
self.daemon = True
def run(self):
while not self.shared.stopped():
self.update()
def update(self):
response = self.request_dispatcher.pop_response()
#print "pop response", response
internal_id = response.get('id')
method = response.get('method')
params = response.get('params')
# A notification
if internal_id is None: # and method is not None and params is not None:
found = self.notification(method, params, response)
if not found and method == 'blockchain.address.subscribe':
request = {
'id': None,
'method': method.replace('.subscribe', '.unsubscribe'),
'params': [self.shared.config.get('server', 'password')] + params,
}
self.request_dispatcher.push_request(None, request)
# A response
elif internal_id is not None:
self.send_response(internal_id, response)
else:
print_log("no method", response)
def notification(self, method, params, response):
subdesc = Session.build_subdesc(method, params)
found = False
for session in self.request_dispatcher.sessions:
if session.stopped():
continue
if session.contains_subscription(subdesc):
session.send_response(response)
found = True
# if not found: print_log("no subscriber for", subdesc)
return found
def send_response(self, internal_id, response):
session, message_id = self.request_dispatcher.get_session_id(internal_id)
if session:
response['id'] = message_id
session.send_response(response)
#else:
# print_log("send_response: no session", message_id, internal_id, response )