[tests] Tidy up mininode.py module

Mostly move only. Adds a few extra comments.

Author: jnewbery

test/functional/test_framework/mininode.py

@@ -27,18 +27,35 @@
 
 logger = logging.getLogger("TestFramework.mininode")
 
-# Keep our own socket map for asyncore, so that we can track disconnects
-# ourselves (to workaround an issue with closing an asyncore socket when
-# using select)
-mininode_socket_map = dict()
-
-# One lock for synchronizing all data access between the networking thread (see
-# NetworkThread below) and the thread running the test logic.  For simplicity,
-# NodeConn acquires this lock whenever delivering a message to a NodeConnCB,
-# and whenever adding anything to the send buffer (in send_message()).  This
-# lock should be acquired in the thread running the test logic to synchronize
-# access to any data shared with the NodeConnCB or NodeConn.
-mininode_lock = RLock()
+MESSAGEMAP = {
+    b"addr": msg_addr,
+    b"block": msg_block,
+    b"blocktxn": msg_blocktxn,
+    b"cmpctblock": msg_cmpctblock,
+    b"feefilter": msg_feefilter,
+    b"getaddr": msg_getaddr,
+    b"getblocks": msg_getblocks,
+    b"getblocktxn": msg_getblocktxn,
+    b"getdata": msg_getdata,
+    b"getheaders": msg_getheaders,
+    b"headers": msg_headers,
+    b"inv": msg_inv,
+    b"mempool": msg_mempool,
+    b"ping": msg_ping,
+    b"pong": msg_pong,
+    b"reject": msg_reject,
+    b"sendcmpct": msg_sendcmpct,
+    b"sendheaders": msg_sendheaders,
+    b"tx": msg_tx,
+    b"verack": msg_verack,
+    b"version": msg_version,
+}
+
+MAGIC_BYTES = {
+    "mainnet": b"\xf9\xbe\xb4\xd9",   # mainnet
+    "testnet3": b"\x0b\x11\x09\x07",  # testnet3
+    "regtest": b"\xfa\xbf\xb5\xda",   # regtest
+}
 
 class NodeConnCB():
     """Callback and helper functions for P2P connection to a bitcoind node.
@@ -183,34 +200,6 @@ class NodeConn(asyncore.dispatcher):
     """The actual NodeConn class
 
     This class provides an interface for a p2p connection to a specified node."""
-    messagemap = {
-        b"version": msg_version,
-        b"verack": msg_verack,
-        b"addr": msg_addr,
-        b"inv": msg_inv,
-        b"getdata": msg_getdata,
-        b"getblocks": msg_getblocks,
-        b"tx": msg_tx,
-        b"block": msg_block,
-        b"getaddr": msg_getaddr,
-        b"ping": msg_ping,
-        b"pong": msg_pong,
-        b"headers": msg_headers,
-        b"getheaders": msg_getheaders,
-        b"reject": msg_reject,
-        b"mempool": msg_mempool,
-        b"feefilter": msg_feefilter,
-        b"sendheaders": msg_sendheaders,
-        b"sendcmpct": msg_sendcmpct,
-        b"cmpctblock": msg_cmpctblock,
-        b"getblocktxn": msg_getblocktxn,
-        b"blocktxn": msg_blocktxn
-    }
-    MAGIC_BYTES = {
-        "mainnet": b"\xf9\xbe\xb4\xd9",   # mainnet
-        "testnet3": b"\x0b\x11\x09\x07",  # testnet3
-        "regtest": b"\xfa\xbf\xb5\xda",   # regtest
-    }
 
     def __init__(self, dstaddr, dstport, rpc, callback, net="regtest", services=NODE_NETWORK|NODE_WITNESS, send_version=True):
         asyncore.dispatcher.__init__(self, map=mininode_socket_map)
@@ -247,6 +236,8 @@ def __init__(self, dstaddr, dstport, rpc, callback, net="regtest", services=NODE
             self.handle_close()
         self.rpc = rpc
 
+    # Connection and disconnection methods
+
     def handle_connect(self):
         if self.state != "connected":
             logger.debug("Connected & Listening: %s:%d" % (self.dstaddr, self.dstport))
@@ -264,44 +255,30 @@ def handle_close(self):
             pass
         self.cb.on_close(self)
 
+    def disconnect_node(self):
+        """ Disconnect the p2p connection.
+
+        Called by the test logic thread. Causes the p2p connection
+        to be disconnected on the next iteration of the asyncore loop."""
+        self.disconnect = True
+
+    # Socket read methods
+
+    def readable(self):
+        return True
+
     def handle_read(self):
         t = self.recv(8192)
         if len(t) > 0:
             self.recvbuf += t
             self.got_data()
 
-    def readable(self):
-        return True
-
-    def writable(self):
-        with mininode_lock:
-            pre_connection = self.state == "connecting"
-            length = len(self.sendbuf)
-        return (length > 0 or pre_connection)
-
-    def handle_write(self):
-        with mininode_lock:
-            # asyncore does not expose socket connection, only the first read/write
-            # event, thus we must check connection manually here to know when we
-            # actually connect
-            if self.state == "connecting":
-                self.handle_connect()
-            if not self.writable():
-                return
-
-            try:
-                sent = self.send(self.sendbuf)
-            except:
-                self.handle_close()
-                return
-            self.sendbuf = self.sendbuf[sent:]
-
     def got_data(self):
         try:
             while True:
                 if len(self.recvbuf) < 4:
                     return
-                if self.recvbuf[:4] != self.MAGIC_BYTES[self.network]:
+                if self.recvbuf[:4] != MAGIC_BYTES[self.network]:
                     raise ValueError("got garbage %s" % repr(self.recvbuf))
                 if len(self.recvbuf) < 4 + 12 + 4 + 4:
                     return
@@ -316,23 +293,54 @@ def got_data(self):
                 if checksum != h[:4]:
                     raise ValueError("got bad checksum " + repr(self.recvbuf))
                 self.recvbuf = self.recvbuf[4+12+4+4+msglen:]
-                if command not in self.messagemap:
+                if command not in MESSAGEMAP:
                     raise ValueError("Received unknown command from %s:%d: '%s' %s" % (self.dstaddr, self.dstport, command, repr(msg)))
                 f = BytesIO(msg)
-                t = self.messagemap[command]()
+                t = MESSAGEMAP[command]()
                 t.deserialize(f)
                 self.got_message(t)
         except Exception as e:
             logger.exception('Error reading message:', repr(e))
             raise
 
+    def got_message(self, message):
+        if self.last_sent + 30 * 60 < time.time():
+            self.send_message(MESSAGEMAP[b'ping']())
+        self._log_message("receive", message)
+        self.cb.deliver(self, message)
+
+    # Socket write methods
+
+    def writable(self):
+        with mininode_lock:
+            pre_connection = self.state == "connecting"
+            length = len(self.sendbuf)
+        return (length > 0 or pre_connection)
+
+    def handle_write(self):
+        with mininode_lock:
+            # asyncore does not expose socket connection, only the first read/write
+            # event, thus we must check connection manually here to know when we
+            # actually connect
+            if self.state == "connecting":
+                self.handle_connect()
+            if not self.writable():
+                return
+
+            try:
+                sent = self.send(self.sendbuf)
+            except:
+                self.handle_close()
+                return
+            self.sendbuf = self.sendbuf[sent:]
+
     def send_message(self, message, pushbuf=False):
         if self.state != "connected" and not pushbuf:
             raise IOError('Not connected, no pushbuf')
         self._log_message("send", message)
         command = message.command
         data = message.serialize()
-        tmsg = self.MAGIC_BYTES[self.network]
+        tmsg = MAGIC_BYTES[self.network]
         tmsg += command
         tmsg += b"\x00" * (12 - len(command))
         tmsg += struct.pack("<I", len(data))
@@ -351,11 +359,7 @@ def send_message(self, message, pushbuf=False):
                 self.sendbuf += tmsg
             self.last_sent = time.time()
 
-    def got_message(self, message):
-        if self.last_sent + 30 * 60 < time.time():
-            self.send_message(self.messagemap[b'ping']())
-        self._log_message("receive", message)
-        self.cb.deliver(self, message)
+    # Class utility methods
 
     def _log_message(self, direction, msg):
         if direction == "send":
@@ -367,9 +371,19 @@ def _log_message(self, direction, msg):
             log_message += "... (msg truncated)"
         logger.debug(log_message)
 
-    def disconnect_node(self):
-        self.disconnect = True
 
+# Keep our own socket map for asyncore, so that we can track disconnects
+# ourselves (to workaround an issue with closing an asyncore socket when
+# using select)
+mininode_socket_map = dict()
+
+# One lock for synchronizing all data access between the networking thread (see
+# NetworkThread below) and the thread running the test logic.  For simplicity,
+# NodeConn acquires this lock whenever delivering a message to a NodeConnCB,
+# and whenever adding anything to the send buffer (in send_message()).  This
+# lock should be acquired in the thread running the test logic to synchronize
+# access to any data shared with the NodeConnCB or NodeConn.
+mininode_lock = RLock()
 
 class NetworkThread(Thread):
     def run(self):
@@ -381,6 +395,6 @@ def run(self):
             for fd, obj in mininode_socket_map.items():
                 if obj.disconnect:
                     disconnected.append(obj)
-            [ obj.handle_close() for obj in disconnected ]
+            [obj.handle_close() for obj in disconnected]
             asyncore.loop(0.1, use_poll=True, map=mininode_socket_map, count=1)
         logger.debug("Network thread closing")