Faraday exceptions shouldn't shadow real exceptions

lib/faraday/adapter/net_http.rb

@@ -44,7 +44,7 @@ module Faraday
 
         @app.call env
       rescue Errno::ECONNREFUSED
-        raise Error::ConnectionFailed, "connection refused"
+        raise Error::ConnectionFailed.new(Errno::ECONNREFUSED)
       end
 
       def net_http_class(env)

lib/faraday/adapter/patron.rb

@@ -26,7 +26,7 @@ module Faraday
 
         @app.call env
       rescue Errno::ECONNREFUSED
-        raise Error::ConnectionFailed, "connection refused"
+        raise Error::ConnectionFailed.new(Errno::ECONNREFUSED)
       end
     end
   end

lib/faraday/adapter/typhoeus.rb

@@ -43,7 +43,7 @@ module Faraday
 
         @app.call env
       rescue Errno::ECONNREFUSED
-        raise Error::ConnectionFailed, "connection refused"
+        raise Error::ConnectionFailed.new(Errno::ECONNREFUSED)
       end
 
       def in_parallel(options = {})

lib/faraday/error.rb

@@ -1,6 +1,29 @@
 module Faraday
   module Error
-    class ClientError      < StandardError; end
+    class ClientError < StandardError
+      def initialize(exception)
+        @inner_exception = exception
+      end
+
+      def message
+        @inner_exception.message
+      end
+
+      def backtrace
+        @inner_exception.backtrace
+      end
+
+      alias to_str message
+
+      def to_s
+        @inner_exception.to_s
+      end
+
+      def inspect
+        @inner_exception.inspect
+      end
+    end
+
     class ConnectionFailed < ClientError;   end
     class ResourceNotFound < ClientError;   end
     class ParsingError     < ClientError;   end

lib/faraday/response/active_support_json.rb

@@ -23,9 +23,8 @@ module Faraday
 
     def self.parse(body)
       ActiveSupport::JSON.decode(body)
-    # TODO:  Maybe rescue Exception can be better ...
-    rescue Yajl::ParseError => e
-      raise Faraday::Error::ParsingError
+    rescue Object => err
+      raise Faraday::Error::ParsingError.new(err)
     end
   end
 end

lib/faraday/response/yajl.rb

@@ -19,8 +19,8 @@ module Faraday
 
     def self.parse(body)
       Yajl::Parser.parse(body)
-    rescue Yajl::ParseError => e
-      raise Faraday::Error::ParsingError
+    rescue Object => err
+      raise Faraday::Error::ParsingError.new(err)
     end
   end
 end