No need for thread to handle requests

Handle requests in the main loop.
Remove unused lock.
interface.py was reworked and send_request() no longer throws.

lib/network.py

@@ -1,4 +1,3 @@
-import threading
 import time
 import Queue
 import os
@@ -129,7 +128,6 @@ class Network(util.DaemonThread):
             config = {}  # Do not use mutables as default values!
         util.DaemonThread.__init__(self)
         self.config = SimpleConfig(config) if type(config) == type({}) else config
-        self.lock = threading.Lock()
         self.num_server = 8 if not self.config.get('oneserver') else 0
         self.blockchain = Blockchain(self.config, self)
         self.interfaces = {}
@@ -303,8 +301,6 @@ class Network(util.DaemonThread):
         self.running = True
         self.response_queue = response_queue
         self.start_interfaces()
-        t = threading.Thread(target=self.process_requests_thread)
-        t.start()
         self.blockchain.start()
         util.DaemonThread.start(self)
 
@@ -433,13 +429,12 @@ class Network(util.DaemonThread):
         else:
             self.response_queue.put(response)
 
-    def process_requests_thread(self):
-        while self.is_running():
-            try:
-                request = self.requests_queue.get(timeout=0.1)
-            except Queue.Empty:
-                continue
-            self.process_request(request)
+    def handle_requests(self):
+        try:
+            request = self.requests_queue.get(timeout=0.1)
+        except Queue.Empty:
+            return
+        self.process_request(request)
 
     def process_request(self, request):
         method = request['method']
@@ -470,14 +465,7 @@ class Network(util.DaemonThread):
 
         # store unanswered request
         self.unanswered_requests[_id] = request
-
-        try:
-            self.interface.send_request(request)
-        except:
-            # put it back in the queue
-            self.print_error("warning: interface not ready for", request)
-            self.requests_queue.put(request)
-            time.sleep(0.1)
+        self.interface.send_request(request)
 
     def check_interfaces(self):
         now = time.time()
@@ -509,6 +497,7 @@ class Network(util.DaemonThread):
     def run(self):
         while self.is_running():
             self.check_interfaces()
+            self.handle_requests()
             try:
                 i, response = self.queue.get(timeout=0.1)
             except Queue.Empty: