subscribed services

server/server.py

@@ -75,12 +75,19 @@ bitcoind_url = 'http://%s:%s@%s:%s/' % ( config.get('bitcoind','user'), config.g
 
 stopping = False
 block_number = -1
+old_block_number = -1
 sessions = {}
+sessions_sub_numblocks = [] # sessions that have subscribed to the service
+
 dblock = thread.allocate_lock()
 peer_list = {}
 
 wallets = {} # for ultra-light clients such as bccapi
 
+from Queue import Queue
+input_queue = Queue()
+output_queue = Queue()
+
 class MyStore(Datastore_class):
 
     def import_tx(self, tx, is_coinbase):
@@ -408,18 +415,7 @@ def poll_session(session_id):
         k = 0
         for addr in addresses:
             if store.tx_cache.get( addr ) is not None: k += 1
-
+            status = get_address_status( addr )
-            # get addtess status, i.e. the last block for that address.
-            tx_points = store.get_history(addr)
-            if not tx_points:
-                status = None
-            else:
-                lastpoint = tx_points[-1]
-                status = lastpoint['blk_hash']
-                # this is a temporary hack; move it up once old clients have disappeared
-                if status == 'mempool' and session['version'] != "old":
-                    status = status + ':%d'% len(tx_points)
-
             last_status = addresses.get( addr )
             if last_status != status:
                 addresses[addr] = status
@@ -433,6 +429,36 @@ def poll_session(session_id):
 
         return out
 
+def get_address_status(addr):
+    # get addtess status, i.e. the last block for that address.
+    tx_points = store.get_history(addr)
+    if not tx_points:
+        status = None
+    else:
+        lastpoint = tx_points[-1]
+        status = lastpoint['blk_hash']
+        # this is a temporary hack; move it up once old clients have disappeared
+        if status == 'mempool': # and session['version'] != "old":
+            status = status + ':%d'% len(tx_points)
+    return status
+
+
+def send_numblocks(session_id):
+    out = json.dumps( {'method':'numblocks.subscribe', 'result':block_number} )
+    output_queue.put((session_id, out))
+
+def subscribe_to_numblocks(session_id):
+    sessions_sub_numblocks.append(session_id)
+    send_numblocks(session_id)
+
+def subscribe_to_address(session_id, address):
+    #print "%s subscribing to %s"%(session_id,address)
+    status = get_address_status(address)
+    sessions[session_id]['type'] = 'subscribe'
+    sessions[session_id]['addresses'][address] = status
+    sessions[session_id]['last_time'] = time.time()
+    out = json.dumps( { 'method':'address.subscribe', 'address':address, 'status':status } )
+    output_queue.put((session_id, out))
 
 def new_session(version, addresses):
     session_id = random_string(10)
@@ -443,11 +469,6 @@ def new_session(version, addresses):
     sessions[session_id]['last_time'] = time.time()
     return out
 
-def subscribe_to_address(session_id, address):
-    sessions[session_id]['addresses'][address] = ''
-    sessions[session_id]['last_time'] = time.time()
-
-
 def update_session(session_id,addresses):
     sessions[session_id]['addresses'] = {}
     for a in addresses:
@@ -611,6 +632,9 @@ def do_command(cmd, data, ipaddr):
 ####################################################################
 
 def tcp_server_thread():
+    thread.start_new_thread(process_input_queue, ())
+    thread.start_new_thread(process_output_queue, ())
+
     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     s.bind((config.get('server','host'), 50001))
@@ -624,19 +648,19 @@ def tcp_server_thread():
             traceback.print_exc(file=sys.stdout)
 
 
-
+# one thread per client. put requests in a queue.
 def tcp_client_thread(ipaddr,conn):
     """ use a persistent connection. put commands in a queue."""
     print "persistent client thread", ipaddr
     global sessions
 
     session_id = random_string(10)
-    sessions[session_id] = { 'addresses':{}, 'version':'unknown' }
+    sessions[session_id] = { 'conn':conn, 'addresses':{}, 'version':'unknown' }
 
     ipaddr = ipaddr[0]
     msg = ''
 
-    while True:
+    while not stopping:
         d = conn.recv(1024)
         msg += d
         if not d: break
@@ -655,17 +679,40 @@ def tcp_client_thread(ipaddr,conn):
                     print "syntax error", repr(c), ipaddr
                     continue
 
+                # add to queue
+                input_queue.put((session_id, cmd, data))
+
+
+# read commands from the input queue. perform requests, etc. this should be called from the main thread.
+def process_input_queue():
+    while not stopping:
+        session_id, cmd, data = input_queue.get()
         out = None
-                if cmd == 'blockchain.address.subscribe':
+        if cmd == 'address.subscribe':
             subscribe_to_address(session_id,data)
+        elif cmd == 'numblocks.subscribe':
+            subscribe_to_numblocks(session_id)
         elif cmd == 'client.version':
             sessions[session_id]['version'] = data
         elif cmd == 'server.banner':
             out = json.dumps( { 'method':'server.banner', 'result':config.get('server','banner').replace('\\n','\n') } )
+        elif cmd == 'address.get_history':
+            address = data
+            out = json.dumps( { 'method':'address.get_history', 'address':address, 'result':store.get_history( address ) } )
+        elif cmd == 'transaction.broadcast':
+            out = json.dumps( { 'method':'transaction.broadcast', 'result':send_tx(data) } )
         else:
             print "unknown command", cmd
-
         if out:
+            output_queue.put((session_id, out))
+
+# this is a separate thread
+def process_output_queue():
+    while not stopping:
+        session_id, out = output_queue.get()
+        session = sessions.get(session_id)
+        if session: 
+            conn = session.get('conn')
             conn.send(out+'\n')
 
 
@@ -835,6 +882,12 @@ if __name__ == '__main__':
             store.catch_up()
             memorypool_update(store)
             block_number = store.get_block_number(1)
+
+            if block_number != old_block_number:
+                old_block_number = block_number
+                for session_id in sessions_sub_numblocks:
+                    send_numblocks(session_id)
+
         except IOError:
             print "IOError: cannot reach bitcoind"
             block_number = 0