Add #local_host and #local_port to Connection and SslConnection

So that you can figure out which interface and port the connection is using.

lib/ione/io/connection.rb

@@ -6,7 +6,7 @@ module Io
     # from and writing to the socket.
     # @since v1.0.0
     class Connection < BaseConnection
-      attr_reader :connection_timeout
+      attr_reader :connection_timeout, :local_host, :local_port
 
       # @private
       def initialize(host, port, connection_timeout, unblocker, clock, socket_impl=Socket)
@@ -37,6 +37,7 @@ def connect
           end
         rescue Errno::EISCONN
           @state = CONNECTED_STATE
+          @local_host, @local_port = @io.local_address.ip_unpack
           @connected_promise.fulfill(self)
         rescue Errno::EINPROGRESS, Errno::EALREADY
           if @clock.now - @connection_started_at > @connection_timeout

lib/ione/io/ssl_connection.rb

@@ -7,6 +7,8 @@ module Ione
   module Io
     # @private
     class SslConnection < BaseConnection
+      attr_reader :local_host, :local_port
+
       def initialize(host, port, io, unblocker, ssl_context=nil, socket_impl=OpenSSL::SSL::SSLSocket)
         super(host, port, unblocker)
         @socket_impl = socket_impl
@@ -23,6 +25,7 @@ def connect
           @io = @socket_impl.new(@raw_io)
         end
         @io.connect_nonblock
+        @local_host, @local_port = @io.local_address.ip_unpack
         @state = CONNECTED_STATE
         @connected_promise.fulfill(self)
         @connected_promise.future

spec/ione/io/connection_spec.rb

@@ -27,6 +27,10 @@ module Io
         double(:socket)
       end
 
+      let :local_address do
+        double(:local_address, ip_unpack: ['1.2.3.4', 65432])
+      end
+
       before do
         socket_impl.stub(:getaddrinfo)
           .with('example.com', 55555, nil, Socket::SOCK_STREAM)
@@ -42,6 +46,7 @@ module Io
       before do
         socket.stub(:connect_nonblock)
         socket.stub(:close)
+        socket.stub(:local_address).and_return(local_address)
       end
 
       it_behaves_like 'a connection' do
@@ -324,6 +329,44 @@ module Io
           end
         end
       end
+
+      describe '#local_host' do
+        context 'when not yet connected' do
+          it 'returns nil' do
+            handler.local_host.should be_nil
+          end
+        end
+
+        context 'when connected' do
+          before do
+            socket.stub(:connect_nonblock).and_raise(Errno::EISCONN)
+          end
+
+          it 'returns the hostname of the interface the socket is using' do
+            handler.connect
+            handler.local_host.should eq('1.2.3.4')
+          end
+        end
+      end
+
+      describe '#local_port' do
+        context 'when not yet connected' do
+          it 'returns nil' do
+            handler.local_host.should be_nil
+          end
+        end
+
+        context 'when connected' do
+          before do
+            socket.stub(:connect_nonblock).and_raise(Errno::EISCONN)
+          end
+
+          it 'returns the local port the socket is using' do
+            handler.connect
+            handler.local_port.should eq(65432)
+          end
+        end
+      end
     end
   end
 end

spec/ione/io/ssl_connection_spec.rb

@@ -31,13 +31,18 @@ module Io
         double(:ssl_context)
       end
 
+      let :local_addres do
+        double(:local_addres, ip_unpack: ['1.2.3.4', 65432])
+      end
+
       before do
         socket_impl.stub(:new).with(raw_socket, ssl_context).and_return(ssl_socket)
       end
 
       before do
         ssl_socket.stub(:connect_nonblock)
         ssl_socket.stub(:close)
+        ssl_socket.stub(:local_address).and_return(local_addres)
       end
 
       it_behaves_like 'a connection', skip_read: true do
@@ -178,6 +183,36 @@ module Io
           handler.should be_closed
         end
       end
+
+      describe '#local_host' do
+        context 'when not yet connected' do
+          it 'returns nil' do
+            handler.local_host.should be_nil
+          end
+        end
+
+        context 'when connected' do
+          it 'returns the hostname of the interface the socket is using' do
+            handler.connect
+            handler.local_host.should eq('1.2.3.4')
+          end
+        end
+      end
+
+      describe '#local_port' do
+        context 'when not yet connected' do
+          it 'returns nil' do
+            handler.local_host.should be_nil
+          end
+        end
+
+        context 'when connected' do
+          it 'returns the local port the socket is using' do
+            handler.connect
+            handler.local_port.should eq(65432)
+          end
+        end
+      end
     end
   end
 end