* lib/net/http.rb: More descriptive error message when net/http fails

to connect to a server. Patch by @xaviershay [fix GH-700]
* test/net/http/test_http.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49113 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Jan  3 10:38:52 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* lib/net/http.rb: More descriptive error message when net/http fails
+	  to connect to a server. Patch by @xaviershay [fix GH-700]
+	* test/net/http/test_http.rb: ditto.
+
 Sat Jan  3 10:14:51 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* ext/openssl/ossl.h: Make `SSL_SESSION_cmp` use `CRYPTO_memcmp`

lib/net/http.rb

@@ -876,7 +876,12 @@ module Net   #:nodoc:
 
       D "opening connection to #{conn_address}:#{conn_port}..."
       s = Timeout.timeout(@open_timeout, Net::OpenTimeout) {
-        TCPSocket.open(conn_address, conn_port, @local_host, @local_port)
+        begin
+          TCPSocket.open(conn_address, conn_port, @local_host, @local_port)
+        rescue => e
+          raise e, "Failed to open TCP connection to " +
+            "#{conn_address}:#{conn_port} (#{e.message})"
+        end
       }
       s.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
       D "opened"

test/net/http/test_http.rb

@@ -188,6 +188,15 @@ class TestNetHTTP < Test::Unit::TestCase
     end
   end
 
+  def test_failure_message_includes_failed_domain_and_port
+    begin
+      Net::HTTP.get(URI.parse("http://doesnotexist.bogus"))
+      fail "should have raised"
+    rescue => e
+      assert_includes e.message, "doesnotexist.bogus:80"
+    end
+  end
+
 end
 
 module TestNetHTTP_version_1_1_methods