fix(windows): Add retries for flakiness demonstrated on windows build…

…s for pact-go

lib/pact/provider_verifier/set_up_provider_state.rb

@@ -33,7 +33,23 @@ def call
       attr_reader :provider_state, :consumer
 
       def post_to_provider_state
-        connection = Faraday.new(:url => provider_states_setup_url)
+        verbose = verbose?
+        connection = Faraday.new(:url => provider_states_setup_url) do | faraday |
+          # Have encountered flakiness on windows build for pact-go
+          # Using retries as a hacky solution to try and get around this
+          # until/if we can work out what the underlying cause is.
+          # https://github.com/pact-foundation/pact-go/issues/42
+          # eg. https://ci.appveyor.com/project/mefellows/pact-go/build/25#L1202
+
+          faraday.request :retry, max: 2, interval: 0.05,
+            interval_randomness: 0.5, backoff_factor: 2,
+            methods:[:post],
+            exceptions: [Faraday::ConnectionFailed]
+
+          faraday.response :logger if verbose
+          faraday.adapter Faraday.default_adapter
+        end
+
         connection.post do |req|
           req.headers["Content-Type"] = "application/json"
           add_custom_provider_header req

spec/lib/pact/provider_verifier/set_up_provider_state_retry_spec.rb

@@ -0,0 +1,26 @@
+require 'pact/provider_verifier/set_up_provider_state'
+require 'json'
+require 'webmock/rspec'
+
+module Pact
+  module ProviderVerifier
+    describe SetUpProviderState do
+      let(:provider_states_setup_url) { 'http://localhost:2000' }
+      let(:provider_state) { 'some state' }
+      let(:consumer) { 'Foo' }
+      let(:options) { {} }
+
+      subject { SetUpProviderState.call(provider_state, consumer, options) }
+
+      before do
+        ENV['PROVIDER_STATES_SETUP_URL'] = provider_states_setup_url
+        stub_request(:any, 'http://localhost:2000').to_raise(Errno::ECONNRESET.new).times(2)
+          .then.to_return(status: 200)
+      end
+
+      it "makes a HTTP request to the configured URL with a JSON body containing the consumer and provider state names" do
+        subject
+      end
+    end
+  end
+end

spec/support/dodgey-provider-state-setup-server.rb

@@ -0,0 +1,9 @@
+require 'socket'
+
+server = TCPServer.new 2000 # Server bind to port 2000
+loop do
+  client = server.accept    # Wait for a client to connect
+  puts "ACCEPTED connection"
+  client.puts "HTTP/1.1 200 OK"
+  client.close
+end