Merge pull request jaswope#19 from waterlink/accept-matcher-as-lambda

Add support for lambda as a matcher

lib/rack_reverse_proxy/rule.rb

@@ -47,6 +47,7 @@ def matches(path, *args)
     def build_matcher(spec)
       return /^#{spec}/ if spec.is_a?(String)
       return spec if spec.respond_to?(:match)
+      return spec if spec.respond_to?(:call)
       fail ArgumentError, "Invalid Rule for reverse_proxy"
     end
 
@@ -117,7 +118,7 @@ def initialize(spec, url, path, accept_headers, has_custom_url, headers, rackreq
         @rackreq = rackreq
 
         @headers = headers if accept_headers
-        @spec_arity = spec.method(:match).arity
+        @spec_arity = spec.method(spec_match_method_name).arity
       end
 
       def any?
@@ -147,7 +148,7 @@ def found
 
       def find_matches
         Array(
-          spec.match(*spec_params)
+          spec.send(spec_match_method_name, *spec_params)
         )
       end
 
@@ -171,6 +172,11 @@ def _spec_param_count
         return 1 if spec_arity == -1
         spec_arity
       end
+
+      def spec_match_method_name
+        return :match if spec.respond_to?(:match)
+        :call
+      end
     end
   end
 end

spec/rack/reverse_proxy_spec.rb

@@ -435,6 +435,27 @@ def app
       end
     end
 
+    describe "with a matching lambda" do
+      def app
+        Rack::ReverseProxy.new(dummy_app) do
+          reverse_proxy lambda { |path| path.match(%r{^/test}) }, "http://lambda.example.org"
+        end
+      end
+
+      it "forwards requests to the calling app when path is not matched" do
+        get "/users"
+        expect(last_response).to be_ok
+        expect(last_response.body).to eq("Dummy App")
+      end
+
+      it "proxies requests when a pattern is matched" do
+        stub_request(:get, "http://lambda.example.org/test").to_return(:body => "Proxied App")
+
+        get "/test"
+        expect(last_response.body).to eq("Proxied App")
+      end
+    end
+
     describe "with a matching class" do
       #:nodoc:
       class Matcher