#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2014 Thomas Voegtlin
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import socket
import time
import sys
import os
import threading
import traceback
import json
import Queue
from network import Network
from util import print_msg
from simple_config import SimpleConfig
class NetworkProxy(threading.Thread):
# connects to daemon
# sends requests, runs callbacks
def __init__(self, config = {}):
threading.Thread.__init__(self)
self.daemon = True
self.config = SimpleConfig(config) if type(config) == type({}) else config
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.daemon_port = config.get('daemon_port', 8000)
self.message_id = 0
self.unanswered_requests = {}
self.subscriptions = {}
self.debug = False
self.lock = threading.Lock()
def start(self, start_daemon=False):
daemon_started = False
while True:
try:
self.socket.connect(('', self.daemon_port))
threading.Thread.start(self)
return True
except socket.error:
if not start_daemon:
return False
elif not daemon_started:
print "Starting daemon [%s]"%self.config.get('server')
daemon_started = True
pid = os.fork()
if (pid == 0): # The first child.
os.chdir("/")
os.setsid()
os.umask(0)
pid2 = os.fork()
if (pid2 == 0): # Second child
server = NetworkServer(self.config)
try:
server.main_loop()
except KeyboardInterrupt:
print "Ctrl C - Stopping server"
sys.exit(1)
sys.exit(0)
else:
time.sleep(0.1)
def parse_json(self, message):
s = message.find('\n')
if s==-1:
return None, message
j = json.loads( message[0:s] )
return j, message[s+1:]
def run(self):
# read responses and trigger callbacks
message = ''
while True:
try:
data = self.socket.recv(1024)
except:
data = ''
if not data:
break
message += data
while True:
response, message = self.parse_json(message)
if response is not None:
self.process(response)
else:
break
print "NetworkProxy: exiting"
def process(self, response):
# runs callbacks
if self.debug: print "<--", response
msg_id = response.get('id')
with self.lock:
method, params, callback = self.unanswered_requests.pop(msg_id)
result = response.get('result')
callback(None, {'method':method, 'params':params, 'result':result, 'id':msg_id})
def subscribe(self, messages, callback):
# detect if it is a subscription
with self.lock:
if self.subscriptions.get(callback) is None:
self.subscriptions[callback] = []
for message in messages:
if message not in self.subscriptions[callback]:
self.subscriptions[callback].append(message)
self.do_send( messages, callback )
def do_send(self, messages, callback):
"""return the ids of the requests that we sent"""
out = ''
ids = []
for m in messages:
method, params = m
request = json.dumps( { 'id':self.message_id, 'method':method, 'params':params } )
self.unanswered_requests[self.message_id] = method, params, callback
ids.append(self.message_id)
if self.debug: print "-->", request
self.message_id += 1
out += request + '\n'
while out:
sent = self.socket.send( out )
out = out[sent:]
return ids
def synchronous_get(self, requests, timeout=100000000):
queue = Queue.Queue()
ids = self.do_send(requests, lambda i,x: queue.put(x))
id2 = ids[:]
res = {}
while ids:
r = queue.get(True, timeout)
_id = r.get('id')
if _id in ids:
ids.remove(_id)
res[_id] = r.get('result')
out = []
for _id in id2:
out.append(res[_id])
return out
def get_servers(self):
return self.synchronous_get([('network.get_servers',[])])[0]
def get_header(self, height):
return self.synchronous_get([('network.get_header',[height])])[0]
def get_local_height(self):
return self.synchronous_get([('network.get_local_height',[])])[0]
def is_connected(self):
return self.synchronous_get([('network.is_connected',[])])[0]
def is_up_to_date(self):
return self.synchronous_get([('network.is_up_to_date',[])])[0]
def main_server(self):
return self.synchronous_get([('network.main_server',[])])[0]
def stop(self):
return self.synchronous_get([('daemon.shutdown',[])])[0]
def trigger_callback(self, cb):
pass
class ClientThread(threading.Thread):
# read messages from client (socket), and sends them to Network
# responses are sent back on the same socket
def __init__(self, server, network, socket):
threading.Thread.__init__(self)
self.server = server
self.daemon = True
self.s = socket
self.s.settimeout(0.1)
self.network = network
self.queue = Queue.Queue()
self.unanswered_requests = {}
self.debug = False
def run(self):
message = ''
while True:
self.send_responses()
try:
data = self.s.recv(1024)
except socket.timeout:
continue
if not data:
break
message += data
while True:
cmd, message = self.parse_json(message)
if not cmd:
break
self.process(cmd)
#print "client thread terminating"
def parse_json(self, message):
n = message.find('\n')
if n==-1:
return None, message
j = json.loads( message[0:n] )
return j, message[n+1:]
def process(self, request):
if self.debug: print "<--", request
method = request['method']
params = request['params']
_id = request['id']
if method.startswith('network.'):
out = {'id':_id}
try:
f = getattr(self.network, method[8:])
except AttributeError:
out['error'] = "unknown method"
try:
out['result'] = f(*params)
except BaseException as e:
out['error'] =str(e)
self.queue.put(out)
return
if method == 'daemon.shutdown':
self.server.running = False
self.queue.put({'id':_id, 'result':True})
return
def cb(i,r):
_id = r.get('id')
if _id is not None:
my_id = self.unanswered_requests.pop(_id)
r['id'] = my_id
self.queue.put(r)
new_id = self.network.interface.send([(method, params)], cb) [0]
self.unanswered_requests[new_id] = _id
def send_responses(self):
while True:
try:
r = self.queue.get_nowait()
except Queue.Empty:
break
out = json.dumps(r) + '\n'
while out:
n = self.s.send(out)
out = out[n:]
if self.debug: print "-->", r
class NetworkServer:
def __init__(self, config):
network = Network(config)
if not network.start(wait=True):
print_msg("Not connected, aborting.")
sys.exit(1)
self.network = network
self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.daemon_port = config.get('daemon_port', 8000)
self.server.bind(('', self.daemon_port))
self.server.listen(5)
self.server.settimeout(1)
self.running = False
self.timeout = config.get('daemon_timeout', 60)
def main_loop(self):
self.running = True
t = time.time()
while self.running:
try:
connection, address = self.server.accept()
except socket.timeout:
if time.time() - t > self.timeout:
break
continue
t = time.time()
client = ClientThread(self, self.network, connection)
client.start()
if __name__ == '__main__':
import simple_config
config = simple_config.SimpleConfig({'verbose':True, 'server':'ecdsa.net:50002:s'})
server = NetworkServer(config)
try:
server.main_loop()
except KeyboardInterrupt:
print "Ctrl C - Stopping server"
sys.exit(1)