feat: add feature toggle via environment variable PACT_BROKER_FEATURES

This is a space separated list of active features.

Author: bethesque

lib/pact_broker/api.rb

@@ -1,5 +1,6 @@
 require 'webmachine/adapters/rack_mapped'
 require 'pact_broker/api/resources'
+require 'pact_broker/feature_toggle'
 
 module PactBroker
 
@@ -40,7 +41,7 @@ module PactBroker
         add ['pacts', 'provider', :provider_name, 'latest', :tag], Api::Resources::LatestProviderPacts, {resource_name: "latest_tagged_provider_pact_publications"}
         add ['pacts', 'latest'], Api::Resources::LatestPacts, {resource_name: "latest_pacts"}
 
-        if ENV['RACK_ENV'] != 'production'
+        if PactBroker.feature_enabled?(:wip_pacts)
           add ['pacts', 'provider', :provider_name, 'wip'], Api::Resources::WipProviderPacts, {resource_name: "wip_provider_pact_publications"}
         end
 

lib/pact_broker/feature_toggle.rb

@@ -0,0 +1,13 @@
+module PactBroker
+  class FeatureToggle
+
+    def self.enabled?(feature)
+      ENV['RACK_ENV'] != 'production' || (ENV['PACT_BROKER_FEATURES'] || "").include?(feature.to_s)
+    end
+
+  end
+
+  def self.feature_enabled?(feature)
+    FeatureToggle.enabled?(feature)
+  end
+end

spec/lib/pact_broker/feature_toggle_spec.rb

@@ -0,0 +1,58 @@
+require 'pact_broker/feature_toggle'
+
+module PactBroker
+  describe FeatureToggle do
+    describe "enabled?" do
+      before do
+        allow(ENV).to receive(:[]).and_call_original
+      end
+
+      subject { FeatureToggle.enabled?(:foo) }
+
+      context "when RACK_ENV is not production" do
+
+        before do
+          allow(ENV).to receive(:[]).with('RACK_ENV').and_return('development')
+        end
+
+        context "when PACT_BROKER_FEATURES includes the given string" do
+          before do
+            allow(ENV).to receive(:[]).with('PACT_BROKER_FEATURES').and_return('foo bar')
+          end
+
+          it { is_expected.to be true }
+        end
+
+         context "when PACT_BROKER_FEATURES does not include the given string" do
+            before do
+              allow(ENV).to receive(:[]).with('PACT_BROKER_FEATURES').and_return(nil)
+            end
+
+           it { is_expected.to be true }
+         end
+      end
+
+      context "when RACK_ENV is production" do
+        before do
+          allow(ENV).to receive(:[]).with('RACK_ENV').and_return('production')
+        end
+
+        context "when PACT_BROKER_FEATURES includes the given string" do
+          before do
+            allow(ENV).to receive(:[]).with('PACT_BROKER_FEATURES').and_return('foo bar')
+          end
+
+          it { is_expected.to be true }
+        end
+
+        context "when PACT_BROKER_FEATURES does not include the given string" do
+          before do
+            allow(ENV).to receive(:[]).with('PACT_BROKER_FEATURES').and_return(nil)
+          end
+
+          it { is_expected.to be false }
+        end
+      end
+    end
+  end
+end