Changes based on style and lint checks. (final_code_quality_2)

src/bitmessageqt/settingsmixin.py

@@ -1,14 +1,26 @@
 #!/usr/bin/python2.7
+"""
+src/settingsmixin.py
+====================
+
+"""
 
 from PyQt4 import QtCore, QtGui
 
+
 class SettingsMixin(object):
+    """Mixin for adding geometry and state saving between restarts."""
     def warnIfNoObjectName(self):
+        """
+        Handle objects which don't have a name. Currently it ignores them. Objects without a name can't have their
+        state/geometry saved as they don't have an identifier.
+        """
         if self.objectName() == "":
-            # TODO: logger
+            # .. todo:: logger
             pass
 
     def writeState(self, source):
+        """Save object state (e.g. relative position of a splitter)"""
         self.warnIfNoObjectName()
         settings = QtCore.QSettings()
         settings.beginGroup(self.objectName())
@@ -16,6 +28,7 @@ class SettingsMixin(object):
         settings.endGroup()
 
     def writeGeometry(self, source):
+        """Save object geometry (e.g. window size and position)"""
         self.warnIfNoObjectName()
         settings = QtCore.QSettings()
         settings.beginGroup(self.objectName())
@@ -23,57 +36,73 @@ class SettingsMixin(object):
         settings.endGroup()
 
     def readGeometry(self, target):
+        """Load object geometry"""
         self.warnIfNoObjectName()
         settings = QtCore.QSettings()
         try:
             geom = settings.value("/".join([str(self.objectName()), "geometry"]))
             target.restoreGeometry(geom.toByteArray() if hasattr(geom, 'toByteArray') else geom)
-        except Exception as e:
+        except Exception:
             pass
 
     def readState(self, target):
+        """Load object state"""
         self.warnIfNoObjectName()
         settings = QtCore.QSettings()
         try:
             state = settings.value("/".join([str(self.objectName()), "state"]))
             target.restoreState(state.toByteArray() if hasattr(state, 'toByteArray') else state)
-        except Exception as e:
+        except Exception:
             pass
 
 
 class SMainWindow(QtGui.QMainWindow, SettingsMixin):
+    """Main window with Settings functionality."""
     def loadSettings(self):
+        """Load main window settings."""
         self.readGeometry(self)
         self.readState(self)
 
     def saveSettings(self):
+        """Save main window settings"""
         self.writeState(self)
         self.writeGeometry(self)
 
 
 class STableWidget(QtGui.QTableWidget, SettingsMixin):
+    """Table widget with Settings functionality"""
+    # pylint: disable=too-many-ancestors
     def loadSettings(self):
+        """Load table settings."""
         self.readState(self.horizontalHeader())
 
     def saveSettings(self):
+        """Save table settings."""
         self.writeState(self.horizontalHeader())
 
 
 class SSplitter(QtGui.QSplitter, SettingsMixin):
+    """Splitter with Settings functionality."""
     def loadSettings(self):
+        """Load splitter settings"""
         self.readState(self)
 
     def saveSettings(self):
+        """Save splitter settings."""
         self.writeState(self)
 
 
 class STreeWidget(QtGui.QTreeWidget, SettingsMixin):
+    """Tree widget with settings functionality."""
+    # pylint: disable=too-many-ancestors
     def loadSettings(self):
-        #recurse children
+        """Load tree settings."""
-        #self.readState(self)
+        # recurse children
+        # self.readState(self)
         pass
 
     def saveSettings(self):
-        #recurse children
+        """Save tree settings"""
-        #self.writeState(self)
+        # recurse children
+        # self.writeState(self)
         pass

src/network/socks5.py

@@ -1,36 +1,48 @@
+"""
+src/network/socks5.py
+=====================
+
+"""
+# pylint: disable=attribute-defined-outside-init
+
 import socket
 import struct
 
-from proxy import Proxy, ProxyError, GeneralProxyError
+from proxy import GeneralProxyError, Proxy, ProxyError
+
 
 class Socks5AuthError(ProxyError):
+    """Thrown when the socks5 protocol encounters an authentication error"""
     errorCodes = ("Succeeded",
-        "Authentication is required",
+                  "Authentication is required",
-        "All offered authentication methods were rejected",
+                  "All offered authentication methods were rejected",
-        "Unknown username or invalid password",
+                  "Unknown username or invalid password",
-        "Unknown error")
+                  "Unknown error")
 
 
 class Socks5Error(ProxyError):
+    """Thrown when socks5 protocol encounters an error"""
     errorCodes = ("Succeeded",
-        "General SOCKS server failure",
+                  "General SOCKS server failure",
-        "Connection not allowed by ruleset",
+                  "Connection not allowed by ruleset",
-        "Network unreachable",
+                  "Network unreachable",
-        "Host unreachable",
+                  "Host unreachable",
-        "Connection refused",
+                  "Connection refused",
-        "TTL expired",
+                  "TTL expired",
-        "Command not supported",
+                  "Command not supported",
-        "Address type not supported",
+                  "Address type not supported",
-        "Unknown error")
+                  "Unknown error")
 
 
 class Socks5(Proxy):
+    """A socks5 proxy base class"""
     def __init__(self, address=None):
         Proxy.__init__(self, address)
         self.ipaddr = None
         self.destport = address[1]
 
     def state_init(self):
+        """Protocol initialisation (before connection is established)"""
         if self._auth:
             self.append_write_buf(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
         else:
@@ -39,6 +51,7 @@ class Socks5(Proxy):
         return True
 
     def state_auth_1(self):
+        """Perform authentication if peer is requesting it."""
         ret = struct.unpack('BB', self.read_buf[:2])
         if ret[0] != 5:
             # general error
@@ -48,9 +61,9 @@ class Socks5(Proxy):
             self.set_state("auth_done", length=2)
         elif ret[1] == 2:
             # username/password
-            self.append_write_buf(struct.pack('BB', 1, len(self._auth[0])) + \
+            self.append_write_buf(struct.pack('BB', 1, len(self._auth[0])) +
-                self._auth[0] + struct.pack('B', len(self._auth[1])) + \
+                                  self._auth[0] + struct.pack('B', len(self._auth[1])) +
-                self._auth[1])
+                                  self._auth[1])
             self.set_state("auth_needed", length=2, expectBytes=2)
         else:
             if ret[1] == 0xff:
@@ -62,6 +75,7 @@ class Socks5(Proxy):
         return True
 
     def state_auth_needed(self):
+        """Handle response to authentication attempt"""
         ret = struct.unpack('BB', self.read_buf[0:2])
         if ret[0] != 1:
             # general error
@@ -74,6 +88,7 @@ class Socks5(Proxy):
         return True
 
     def state_pre_connect(self):
+        """Handle feedback from socks5 while it is connecting on our behalf."""
         # Get the response
         if self.read_buf[0:1] != chr(0x05).encode():
             self.close()
@@ -81,7 +96,7 @@ class Socks5(Proxy):
         elif self.read_buf[1:2] != chr(0x00).encode():
             # Connection failed
             self.close()
-            if ord(self.read_buf[1:2])<=8:
+            if ord(self.read_buf[1:2]) <= 8:
                 raise Socks5Error(ord(self.read_buf[1:2]))
             else:
                 raise Socks5Error(9)
@@ -96,21 +111,31 @@ class Socks5(Proxy):
         return True
 
     def state_proxy_addr_1(self):
+        """Handle IPv4 address returned for peer"""
         self.boundaddr = self.read_buf[0:4]
         self.set_state("proxy_port", length=4, expectBytes=2)
         return True
 
     def state_proxy_addr_2_1(self):
+        """
+        Handle other addresses than IPv4 returned for peer (e.g. IPv6, onion, ...). This is part 1 which retrieves the
+        length of the data.
+        """
         self.address_length = ord(self.read_buf[0:1])
         self.set_state("proxy_addr_2_2", length=1, expectBytes=self.address_length)
         return True
 
     def state_proxy_addr_2_2(self):
+        """
+        Handle other addresses than IPv4 returned for peer (e.g. IPv6, onion, ...). This is part 2 which retrieves the
+        data.
+        """
         self.boundaddr = self.read_buf[0:self.address_length]
         self.set_state("proxy_port", length=self.address_length, expectBytes=2)
         return True
 
     def state_proxy_port(self):
+        """Handle peer's port being returned."""
         self.boundport = struct.unpack(">H", self.read_buf[0:2])[0]
         self.__proxysockname = (self.boundaddr, self.boundport)
         if self.ipaddr is not None:
@@ -121,14 +146,17 @@ class Socks5(Proxy):
         return True
 
     def proxy_sock_name(self):
+        """Handle return value when using SOCKS5 for DNS resolving instead of connecting."""
         return socket.inet_ntoa(self.__proxysockname[0])
 
 
 class Socks5Connection(Socks5):
+    """Child socks5 class used for making outbound connections."""
     def __init__(self, address):
         Socks5.__init__(self, address=address)
 
     def state_auth_done(self):
+        """Request connection to be made"""
         # Now we can request the actual connection
         self.append_write_buf(struct.pack('BBB', 0x05, 0x01, 0x00))
         # If the given destination address is an IP address, we'll
@@ -138,10 +166,12 @@ class Socks5Connection(Socks5):
             self.append_write_buf(chr(0x01).encode() + self.ipaddr)
         except socket.error:
             # Well it's not an IP number,  so it's probably a DNS name.
-            if Proxy._remote_dns:
+            if Proxy._remote_dns:  # pylint: disable=protected-access
                 # Resolve remotely
                 self.ipaddr = None
-                self.append_write_buf(chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0])
+                self.append_write_buf(chr(0x03).encode() +
+                                      chr(len(self.destination[0])).encode() +
+                                      self.destination[0])
             else:
                 # Resolve locally
                 self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
@@ -151,6 +181,7 @@ class Socks5Connection(Socks5):
         return True
 
     def state_pre_connect(self):
+        """Tell socks5 to initiate a connection"""
         try:
             return Socks5.state_pre_connect(self)
         except Socks5Error as e:
@@ -159,12 +190,14 @@ class Socks5Connection(Socks5):
 
 
 class Socks5Resolver(Socks5):
+    """DNS resolver class using socks5"""
     def __init__(self, host):
         self.host = host
         self.port = 8444
         Socks5.__init__(self, address=(self.host, self.port))
 
     def state_auth_done(self):
+        """Perform resolving"""
         # Now we can request the actual connection
         self.append_write_buf(struct.pack('BBB', 0x05, 0xF0, 0x00))
         self.append_write_buf(chr(0x03).encode() + chr(len(self.host)).encode() + str(self.host))
@@ -173,4 +206,8 @@ class Socks5Resolver(Socks5):
         return True
 
     def resolved(self):
+        """
+        Resolving is done, process the return value. To use this within PyBitmessage, a callback needs to be
+        implemented which hasn't been done yet.
+        """
         print "Resolved %s as %s" % (self.host, self.proxy_sock_name())