feat: added interface option to fast_com example (nbfast).

fast_com.py

@@ -218,5 +218,3 @@ def fast_com(verbose=False, maxtime=15, forceipv4=False, forceipv6=False):
 	fast_com(verbose=True, maxtime=30)
 
 	print "\ndone"
-
-

fast_com_example_usage.py

@@ -1,4 +1,27 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
+import argparse
+
+parser = argparse.ArgumentParser(description='Run speed test.')
+parser.add_argument('-4', '--ipv4', dest='ipv4', help='IPv4 source address')
+parser.add_argument('-6', '--ipv6', dest='ipv6', help='IPv6 source address')
+parser.add_argument('-i', '--interface', dest='interface', help='Set network interface')
+parser.add_argument('-t', '--timeout', help='HTTP timeout in seconds.')
+
+args = parser.parse_args()
+ipv4_source = None
+ipv6_source = None
+
+ipv4_source = args.ipv4
+ipv6_source = args.ipv6
+network_interface = args.interface
+network_timeout = args.timeout
+
+import socket
+from patch_socket_create_connection import CustomSocket
+my_socket = CustomSocket(
+        ipv4_source=ipv4_source, ipv6_source=ipv6_source, 
+        network_interface=network_interface, network_timeout=network_timeout)
+socket.create_connection = my_socket.create_connection_with_custom_network_interface
 
 import fast_com
 

patch_socket_create_connection.py

@@ -0,0 +1,92 @@
+import socket 
+import sys
+from IN import SO_BINDTODEVICE
+
+class CustomSocket(object):
+    def __init__(self, 
+                 network_interface=None, 
+                 ipv4_source=None, ipv6_source=None, 
+                 network_timeout=None):
+
+        if network_interface is not None:
+            network_interface = network_interface.strip()[:15] + '\0'
+        self.network_interface = network_interface
+
+        if network_timeout is not None:
+            network_timeout = float(network_timeout)
+        self.network_timeout = network_timeout
+
+        if ipv6_source is not None:
+            parsed_ipv6_source = self.parse_source_address(ipv6_source)
+            ipv6_source = self.extract_source_address_from_ipv6(parsed_ipv6_source)
+        self.ipv6_source = ipv6_source
+
+        if ipv4_source is not None:
+            ipv4_source = self.parse_source_address(ipv4_source)
+        self.ipv4_source = ipv4_source
+
+    @staticmethod
+    def parse_source_address(source_addr):
+        source_addr = source_addr.split(',')
+        if len(source_addr) == 1:
+            return (source_addr[0], 0)
+        return (source_addr[0], int(source_addr[1]))
+
+    @staticmethod
+    def extract_source_address_from_ipv6(ipv6_source):
+        source_ip, source_port = ipv6_source
+        source_address = [addr for addr in socket.getaddrinfo(source_ip, source_port, socket.AF_INET6, socket.SOCK_STREAM, socket.SOL_TCP)] 
+        if not source_address:
+            raise ValueError("Couldn't find ipv6 address for source %s" % source_ip)
+        return source_address[0][-1]
+
+    def get_source_address(self, host):
+        if ':' in host:
+            return self.ipv6_source
+
+        return self.ipv4_source
+
+    def create_connection_with_custom_network_interface(
+        self, address, timeout, source_address=None):
+        """
+        Patched the standard library (v2.7.3) socket.create_connection to 
+        connect to a network interface.
+
+        https://github.com/enthought/Python-2.7.3/blob/master/Lib/socket.py#L537
+        """
+        host, port = address
+
+        for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
+            af, socktype, proto, canonname, sa = res
+            sock = None
+            try:
+                sock = socket.socket(af, socktype, proto)
+
+                if source_address is None:
+                    source_address = self.get_source_address(host)
+
+                if self.network_interface:
+                    try:
+                        sock.setsockopt(socket.SOL_SOCKET, 
+                                        SO_BINDTODEVICE, 
+                                        self.network_interface)
+                    except Exception as e:
+                        err_msg = "No device exists: {}".format(self.network_interface)
+                        sys.exit(err_msg)
+                elif source_address:
+                    sock.bind(source_address)
+
+                if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:
+                    sock.settimeout(timeout)
+                elif self.network_timeout:
+                    sock.settimeout(self.network_timeout)
+
+                sock.connect(sa)
+
+                return sock
+            except socket.error as err:
+                if sock:
+                    sock.close()
+                raise err
+
+        raise error("getaddrinfo returns an empty list")