Refactor bandwidth limit and speed calculator

- also fixes potential deadlocks

src/bitmessageqt/__init__.py

@@ -82,6 +82,7 @@ from proofofwork import getPowType
 import protocol
 import state
 from statusbar import BMStatusBar
+import throttle
 from version import softwareVersion
 
 def _translate(context, text, disambiguation = None, encoding = None, number = None):
@@ -2391,6 +2392,8 @@ class MyForm(settingsmixin.SMainWindow):
             except:
                 QMessageBox.about(self, _translate("MainWindow", "Number needed"), _translate(
                     "MainWindow", "Your maximum download and upload rate must be numbers. Ignoring what you typed."))
+            throttle.SendThrottle.resetLimit()
+            throttle.ReceiveThrottle.resetLimit()
 
             BMConfigParser().set('bitmessagesettings', 'namecoinrpctype',
                 self.settingsDialogInstance.getNamecoinType())

src/bitmessageqt/networkstatus.py

@@ -7,6 +7,7 @@ import l10n
 from retranslateui import RetranslateMixin
 from uisignaler import UISignaler
 import widgets
+import throttle
 
 
 class NetworkStatus(QtGui.QWidget, RetranslateMixin):
@@ -28,9 +29,6 @@ class NetworkStatus(QtGui.QWidget, RetranslateMixin):
         QtCore.QObject.connect(self.UISignalThread, QtCore.SIGNAL(
             "updateNetworkStatusTab()"), self.updateNetworkStatusTab)
         
-        self.totalNumberOfBytesReceived = 0
-        self.totalNumberOfBytesSent = 0
-        
         self.timer = QtCore.QTimer()
         self.timer.start(2000) # milliseconds
         QtCore.QObject.connect(self.timer, QtCore.SIGNAL("timeout()"), self.runEveryTwoSeconds)
@@ -70,13 +68,9 @@ class NetworkStatus(QtGui.QWidget, RetranslateMixin):
         sent and received by 2.
         """
         self.labelBytesRecvCount.setText(_translate(
-            "networkstatus", "Down: %1/s  Total: %2").arg(self.formatByteRate(shared.numberOfBytesReceived/2), self.formatBytes(self.totalNumberOfBytesReceived)))
+            "networkstatus", "Down: %1/s  Total: %2").arg(self.formatByteRate(throttle.ReceiveThrottle().getSpeed()), self.formatBytes(throttle.ReceiveThrottle().total)))
         self.labelBytesSentCount.setText(_translate(
-            "networkstatus", "Up: %1/s  Total: %2").arg(self.formatByteRate(shared.numberOfBytesSent/2), self.formatBytes(self.totalNumberOfBytesSent)))
-        self.totalNumberOfBytesReceived += shared.numberOfBytesReceived
-        self.totalNumberOfBytesSent += shared.numberOfBytesSent
-        shared.numberOfBytesReceived = 0
-        shared.numberOfBytesSent = 0
+            "networkstatus", "Up: %1/s  Total: %2").arg(self.formatByteRate(throttle.SendThrottle().getSpeed()), self.formatBytes(throttle.SendThrottle().total)))
 
     def updateNetworkStatusTab(self):
         totalNumberOfConnectionsFromAllStreams = 0  # One would think we could use len(sendDataQueues) for this but the number doesn't always match: just because we have a sendDataThread running doesn't mean that the connection has been fully established (with the exchange of version messages).

src/class_receiveDataThread.py

@@ -32,6 +32,7 @@ import paths
 import protocol
 from inventory import Inventory
 import state
+import throttle
 import tr
 from version import softwareVersion
 
@@ -82,19 +83,6 @@ class receiveDataThread(threading.Thread):
         logger.debug('receiveDataThread starting. ID ' + str(id(self)) + '. The size of the shared.connectedHostsList is now ' + str(len(shared.connectedHostsList)))
 
         while True:
-            if BMConfigParser().getint('bitmessagesettings', 'maxdownloadrate') == 0:
-                downloadRateLimitBytes = float("inf")
-            else:
-                downloadRateLimitBytes = BMConfigParser().getint('bitmessagesettings', 'maxdownloadrate') * 1000
-            with shared.receiveDataLock:
-                while shared.numberOfBytesReceivedLastSecond >= downloadRateLimitBytes:
-                    if int(time.time()) == shared.lastTimeWeResetBytesReceived:
-                        # If it's still the same second that it was last time then sleep.
-                        time.sleep(0.3)
-                    else:
-                        # It's a new second. Let us clear the shared.numberOfBytesReceivedLastSecond.
-                        shared.lastTimeWeResetBytesReceived = int(time.time())
-                        shared.numberOfBytesReceivedLastSecond = 0
             dataLen = len(self.data)
             try:
                 ssl = False
@@ -102,12 +90,11 @@ class receiveDataThread(threading.Thread):
                     self.connectionIsOrWasFullyEstablished and
                     protocol.haveSSL(not self.initiatedConnection)):
                     ssl = True
-                    dataRecv = self.sslSock.recv(1024)
+                    dataRecv = self.sslSock.recv(4096)
                 else:
-                    dataRecv = self.sock.recv(1024)
+                    dataRecv = self.sock.recv(4096)
                 self.data += dataRecv
-                shared.numberOfBytesReceived += len(dataRecv) # for the 'network status' UI tab. The UI clears this value whenever it updates.
-                shared.numberOfBytesReceivedLastSecond += len(dataRecv) # for the download rate limit
+                throttle.ReceiveThrottle().wait(len(dataRecv))
             except socket.timeout:
                 logger.error ('Timeout occurred waiting for data from ' + str(self.peer) + '. Closing receiveData thread. (ID: ' + str(id(self)) + ')')
                 break

src/class_sendDataThread.py

@@ -1,3 +1,4 @@
+import errno
 import time
 import threading
 import shared
@@ -15,6 +16,7 @@ from addresses import *
 from debug import logger
 import protocol
 import state
+import throttle
 
 # Every connection to a peer has a sendDataThread (and also a
 # receiveDataThread).
@@ -70,36 +72,30 @@ class sendDataThread(threading.Thread):
         self.versionSent = 1
 
     def sendBytes(self, data):
-        if BMConfigParser().getint('bitmessagesettings', 'maxuploadrate') == 0:
-            uploadRateLimitBytes = 999999999 # float("inf") doesn't work
-        else:
-            uploadRateLimitBytes = BMConfigParser().getint('bitmessagesettings', 'maxuploadrate') * 1000
-        with shared.sendDataLock:
-            while data:
-                while shared.numberOfBytesSentLastSecond >= uploadRateLimitBytes:
-                    if int(time.time()) == shared.lastTimeWeResetBytesSent:
-                        time.sleep(0.3)
-                    else:
-                        # It's a new second. Let us clear the shared.numberOfBytesSentLastSecond
-                        shared.lastTimeWeResetBytesSent = int(time.time())
-                        shared.numberOfBytesSentLastSecond = 0
-                        # If the user raises or lowers the uploadRateLimit then we should make use of
-                        # the new setting. If we are hitting the limit then we'll check here about 
-                        # once per second.
-                        if BMConfigParser().getint('bitmessagesettings', 'maxuploadrate') == 0:
-                            uploadRateLimitBytes = 999999999 # float("inf") doesn't work
-                        else:
-                            uploadRateLimitBytes = BMConfigParser().getint('bitmessagesettings', 'maxuploadrate') * 1000
-                if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
-                    self.connectionIsOrWasFullyEstablished and
-                    protocol.haveSSL(not self.initiatedConnection)):
-                    amountSent = self.sslSock.send(data[:1000])
-                else:
-                    amountSent = self.sock.send(data[:1000])
-                shared.numberOfBytesSent += amountSent # used for the 'network status' tab in the UI
-                shared.numberOfBytesSentLastSecond += amountSent
-                self.lastTimeISentData = int(time.time())
-                data = data[amountSent:]
+        while data:
+            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
+            else:
+                while True:
+                    try:
+                        amountSent = self.sock.send(data[:4096])
+                        break
+                    except socket.error as e:
+                        if e.errno == errno.EAGAIN:
+                            continue
+                        raise
+            throttle.SendThrottle().wait(amountSent)
+            self.lastTimeISentData = int(time.time())
+            data = data[amountSent:]
 
 
     def run(self):
@@ -178,7 +174,7 @@ class sendDataThread(threading.Thread):
                     try:
                         self.sendBytes(data)
                     except:
-                        logger.error('Sending of data to ' + str(self.peer) + ' failed. sendDataThread thread ' + str(self) + ' ending now.')
+                        logger.error('Sending of data to ' + str(self.peer) + ' failed. sendDataThread thread ' + str(self) + ' ending now.', exc_info=True)
                         break
                 elif command == 'connectionIsOrWasFullyEstablished':
                     self.connectionIsOrWasFullyEstablished = True

src/shared.py

@@ -67,14 +67,6 @@ clientHasReceivedIncomingConnections = False #used by API command clientStatus
 numberOfMessagesProcessed = 0
 numberOfBroadcastsProcessed = 0
 numberOfPubkeysProcessed = 0
-numberOfBytesReceived = 0 # Used for the 'network status' page
-numberOfBytesSent = 0 # Used for the 'network status' page
-numberOfBytesReceivedLastSecond = 0 # used for the bandwidth rate limit
-numberOfBytesSentLastSecond = 0 # used for the bandwidth rate limit
-lastTimeWeResetBytesReceived = 0 # used for the bandwidth rate limit
-lastTimeWeResetBytesSent = 0 # used for the bandwidth rate limit
-sendDataLock = threading.Lock() # used for the bandwidth rate limit
-receiveDataLock = threading.Lock() # used for the bandwidth rate limit
 daemon = False
 needToWriteKnownNodesToDisk = False # If True, the singleCleaner will write it to disk eventually.
 maximumLengthOfTimeToBotherResendingMessages = 0

src/throttle.py

@@ -0,0 +1,64 @@
+import threading
+import time
+
+from configparser import BMConfigParser
+from singleton import Singleton
+import state
+
+class Throttle(object):
+    def __init__(self, limit=0):
+        self.limit = limit
+        self.speed = 0
+        self.txTime = int(time.time())
+        self.txLen = 0
+        self.total = 0
+        self.timer = threading.Event()
+        self.lock = threading.RLock()
+
+    def recalculate(self):
+        with self.lock:
+            now = int(time.time())
+            if now > self.txTime:
+                self.speed = self.txLen / (now - self.txTime)
+                self.txLen -= self.limit * (now - self.txTime)
+                self.txTime = now
+                if self.txLen < 0 or self.limit == 0:
+                    self.txLen = 0
+
+    def wait(self, dataLen):
+        with self.lock:
+            self.waiting = True
+        with self.lock:
+            self.txLen += dataLen
+            self.total += dataLen
+        while state.shutdown == 0:
+            self.recalculate()
+            if self.limit == 0:
+                break
+            if self.txLen < self.limit:
+                break
+            self.timer.wait(0.2)
+        with self.lock:
+            self.waiting = False
+
+    def getSpeed(self):
+        self.recalculate()
+        return self.speed
+
+@Singleton
+class SendThrottle(Throttle):
+    def __init__(self):
+        Throttle.__init__(self, BMConfigParser().safeGetInt('bitmessagesettings', 'maxuploadrate')*1024)
+    
+    def resetLimit(self):
+        with self.lock:
+            self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxuploadrate')*1024
+
+@Singleton
+class ReceiveThrottle(Throttle):
+    def __init__(self):
+        Throttle.__init__(self, BMConfigParser().safeGetInt('bitmessagesettings', 'maxdownloadrate')*1024)
+
+    def resetLimit(self):
+        with self.lock:
+            self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxdownloadrate')*1024