Transfer speed improvements

- send buffer to send multiple commands in one TCP packet
- recv/send operation size now based on bandwith limit
- send queue limited to 100 entries
- buffer getdata commands to fill send queue, instead of waiting for the
  data packet to arrive first (i.e. allow getdata to work asynchronously)

src/class_outgoingSynSender.py

@@ -191,7 +191,7 @@ class outgoingSynSender(threading.Thread, StoppableThread):
             try:
                 self.sock.connect((peer.host, peer.port))
                 someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory.
-                sendDataThreadQueue = Queue.Queue() # Used to submit information to the send data thread for this connection. 
+                sendDataThreadQueue = Queue.Queue(100) # Used to submit information to the send data thread for this connection. 
 
                 sd = sendDataThread(sendDataThreadQueue)
                 sd.setup(self.sock, peer.host, peer.port, self.streamNumber,

src/class_receiveDataThread.py

@@ -90,9 +90,9 @@ class receiveDataThread(threading.Thread):
                     self.connectionIsOrWasFullyEstablished and
                     protocol.haveSSL(not self.initiatedConnection)):
                     ssl = True
-                    dataRecv = self.sslSock.recv(4096)
+                    dataRecv = self.sslSock.recv(throttle.ReceiveThrottle().chunkSize)
                 else:
-                    dataRecv = self.sock.recv(4096)
+                    dataRecv = self.sock.recv(throttle.ReceiveThrottle().chunkSize)
                 self.data += dataRecv
                 throttle.ReceiveThrottle().wait(len(dataRecv))
             except socket.timeout:
@@ -222,7 +222,7 @@ class receiveDataThread(threading.Thread):
         self.data = self.data[payloadLength + protocol.Header.size:] # take this message out and then process the next message
 
         if self.data == '': # if there are no more messages
-            while len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
+            while len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0 and not self.sendDataThreadQueue.full():
                 objectHash, = random.sample(
                     self.objectsThatWeHaveYetToGetFromThisPeer, 1)
                 if objectHash in Inventory():
@@ -240,7 +240,6 @@ class receiveDataThread(threading.Thread):
                                 self.peer]  # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together.
                         except:
                             pass
-                    break
                 if len(self.objectsThatWeHaveYetToGetFromThisPeer) == 0:
                     # We had objectsThatWeHaveYetToGetFromThisPeer but the loop ran, they were all in our inventory, and now we don't have any to get anymore.
                     logger.debug('(concerning' + str(self.peer) + ') number of objectsThatWeHaveYetToGetFromThisPeer is now 0')

src/class_sendDataThread.py

@@ -42,6 +42,7 @@ class sendDataThread(threading.Thread):
         self.name = "sendData-" + self.peer.host.replace(":", ".") # log parser field separator
         self.streamNumber = streamNumber
         self.services = 0
+        self.buffer = ""
         self.initiatedConnection = False
         self.remoteProtocolVersion = - \
             1  # This must be set using setRemoteProtocolVersion command which is sent through the self.sendDataThreadQueue queue.
@@ -69,36 +70,32 @@ class sendDataThread(threading.Thread):
             
         self.versionSent = 1
 
-    def sendBytes(self, data):
-        while data:
+    def sendBytes(self, data = ""):
+        self.buffer += data
+        if len(self.buffer) < throttle.SendThrottle().chunkSize and self.sendDataThreadQueue.qsize() > 1:
+            return
+
+        while self.buffer and state.shutdown == 0:
+            try:
                 if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
                     self.connectionIsOrWasFullyEstablished and
                     protocol.haveSSL(not self.initiatedConnection)):
-                while state.shutdown == 0:
-                    try:
-                        amountSent = self.sslSock.send(data[:4096])
-                        break
-                    except socket.error as e:
-                        if e.errno == errno.EAGAIN:
-                            continue
-                        raise
+                    amountSent = self.sslSock.send(self.buffer[:throttle.SendThrottle().chunkSize])
                 else:
-                while True:
-                    try:
-                        amountSent = self.sock.send(data[:4096])
-                        break
+                    amountSent = self.sock.send(self.buffer[:throttle.SendThrottle().chunkSize])
             except socket.error as e:
                 if e.errno == errno.EAGAIN:
                     continue
                 raise
             throttle.SendThrottle().wait(amountSent)
             self.lastTimeISentData = int(time.time())
-            data = data[amountSent:]
+            self.buffer = self.buffer[amountSent:]
 
 
     def run(self):
         logger.debug('sendDataThread starting. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues)))
         while True:
+            self.sendBytes()
             deststream, command, data = self.sendDataThreadQueue.get()
 
             if deststream == self.streamNumber or deststream == 0:

src/class_singleListener.py

@@ -134,7 +134,7 @@ class singleListener(threading.Thread, StoppableThread):
                     break
 
             someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory.
-            sendDataThreadQueue = Queue.Queue() # Used to submit information to the send data thread for this connection.
+            sendDataThreadQueue = Queue.Queue(100) # Used to submit information to the send data thread for this connection.
             socketObject.settimeout(20)
 
             sd = sendDataThread(sendDataThreadQueue)

src/throttle.py

@@ -1,3 +1,4 @@
+import math
 import threading
 import time
 
@@ -6,14 +7,19 @@ from singleton import Singleton
 import state
 
 class Throttle(object):
+    minChunkSize = 4096
+    maxChunkSize = 131072
+
     def __init__(self, limit=0):
         self.limit = limit
         self.speed = 0
+        self.chunkSize = Throttle.maxChunkSize
         self.txTime = int(time.time())
         self.txLen = 0
         self.total = 0
         self.timer = threading.Event()
         self.lock = threading.RLock()
+        self.resetChunkSize()
 
     def recalculate(self):
         with self.lock:
@@ -41,6 +47,19 @@ class Throttle(object):
         self.recalculate()
         return self.speed
 
+    def resetChunkSize(self):
+        with self.lock:
+            # power of two smaller or equal to speed limit
+            try:
+                self.chunkSize = int(math.pow(2, int(math.log(self.limit,2))))
+            except ValueError:
+                self.chunkSize = Throttle.maxChunkSize
+            # range check
+            if self.chunkSize < Throttle.minChunkSize:
+                self.chunkSize = Throttle.minChunkSize
+            elif self.chunkSize > Throttle.maxChunkSize:
+                self.chunkSize = Throttle.maxChunkSize
+
 @Singleton
 class SendThrottle(Throttle):
     def __init__(self):
@@ -49,6 +68,7 @@ class SendThrottle(Throttle):
     def resetLimit(self):
         with self.lock:
             self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxuploadrate')*1024
+        Throttle.resetChunkSize()
 
 @Singleton
 class ReceiveThrottle(Throttle):
@@ -58,3 +78,4 @@ class ReceiveThrottle(Throttle):
     def resetLimit(self):
         with self.lock:
             self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxdownloadrate')*1024
+        Throttle.resetChunkSize()