import socket
import threading
import time
+import traceback, sys
import Queue as queue
+def random_string(N):
+ import random, string
+ return ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(N))
+
+def timestr():
+ return time.strftime("[%d/%m/%Y-%H:%M:%S]")
+
+
class Shared:
def __init__(self):
class Processor(threading.Thread):
def __init__(self):
- self.shared = None
+ threading.Thread.__init__(self)
+ self.daemon = True
+ self.dispatcher = None
+ self.queue = queue.Queue()
+
+ def process(self, request):
+ pass
+
+ 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 "processor terminating"
+
+
+
+class Dispatcher:
+
+ def __init__(self):
+ self.shared = Shared()
+ 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.internal_id = 1
self.lock = threading.Lock()
self.sessions = []
+ self.processors = {}
def push_response(self, item):
self.response_queue.put(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)
raise TypeError("self.shared not set in Processor")
while not self.shared.stopped():
session, request = self.pop_request()
-
- method = request['method']
- params = request.get('params',[])
-
- if method in [ 'numblocks.subscribe', 'address.subscribe', 'server.peers']:
- session.subscribe_to_service(method, params)
-
- # store session and id locally
- request['id'] = self.store_session_id(session, request['id'])
- self.process(request)
+ self.do_dispatch(session, request)
self.stop()
def stop(self):
pass
- def process(self, request):
- print "New request", request
- # Do stuff...
- # response = request
- # When ready, you call
- # self.push_response(response)
+ def do_dispatch(self, session, request):
+ """ dispatch request to the relevant processor """
+
+ method = request['method']
+ params = request.get('params',[])
+ suffix = method.split('.')[-1]
+ 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 "error: no processor for", prefix
+ return
+
+ p.queue.put(request)
+
+ if method in ['server.version']:
+ session.version = params[0]
+
+ def get_sessions(self):
+ with self.lock:
+ r = self.sessions[:]
+ return r
def add_session(self, session):
with self.lock:
self._stopped = False
self.lock = threading.Lock()
self.subscriptions = []
+ self.address = ''
+ self.name = ''
+ self.version = 'unknown'
+ 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 timestr(), self.name, self.address, addr,\
+ 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.address.subscribe":
+ if not params:
+ return None
+ else:
+ return method, params[0]
+ else:
+ return None
+
+ def contains_subscription(self, subdesc):
with self.lock:
- self.subscriptions.append((method, params))
+ return subdesc in self.subscriptions
-class Dispatcher(threading.Thread):
+class ResponseDispatcher(threading.Thread):
def __init__(self, shared, processor):
self.shared = shared
self.processor = processor
threading.Thread.__init__(self)
+ self.daemon = True
def run(self):
while not self.shared.stopped():
- response = self.processor.pop_response()
- #print "pop response", response
- internal_id = response.get('id')
- params = response.get('params',[])
- try:
- method = response['method']
- except:
- print "no method", response
+ self.update()
+
+ def update(self):
+ response = self.processor.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:
+ self.notification(method, params, response)
+ # A response
+ elif internal_id is not None: # and method is None and params is None:
+ self.send_response(internal_id, response)
+ else:
+ print "no method", response
+
+ def notification(self, method, params, response):
+ subdesc = Session.build_subdesc(method, params)
+ for session in self.processor.sessions:
+ if session.stopped():
continue
-
- if internal_id:
- session, message_id = self.processor.get_session_id(internal_id)
- response['id'] = message_id
+ if session.contains_subscription(subdesc):
session.send_response(response)
- else:
- for session in self.processor.sessions:
- if not session.stopped():
- if (method,params) in session.subscriptions:
- session.send_response(response)
+ def send_response(self, internal_id, response):
+ session, message_id = self.processor.get_session_id(internal_id)
+ if session:
+ response['id'] = message_id
+ session.send_response(response)
+ else:
+ print "send_response: no session", message_id, internal_id, response