From 4ecb21c0b00a253478d443d37b1472316c388013 Mon Sep 17 00:00:00 2001
From: Andrew Waage <andrew@retentionscience.com>
Date: Wed, 18 May 2016 15:40:25 -0700
Subject: [PATCH] first pass at caching. still WIP. Need to parameterize some
 things

---
 Gemfile.lock                                   | 16 ++++++++++++++++
 github_changelog_generator.gemspec             |  2 ++
 lib/github_changelog_generator.rb              |  3 +++
 lib/github_changelog_generator/octo_fetcher.rb | 16 ++++++++++++++++
 4 files changed, 37 insertions(+)

diff --git a/Gemfile.lock b/Gemfile.lock
index 2c2ff57..86499b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,12 +4,21 @@ PATH
     github_changelog_generator (1.13.1)
       github_api (>= 0.14)
       rainbow (>= 2.1)
+      activesupport
+      faraday-http-cache
+      github_api (~> 0.12)
       octokit (~> 4.0)
       rake (>= 10.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (4.2.6)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
     addressable (2.4.0)
     ast (2.3.0)
     childprocess (0.5.9)
@@ -28,17 +37,22 @@ GEM
     docile (1.1.5)
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
+    faraday-http-cache (1.3.0)
     ffi (1.9.14)
     github_api (0.14.5)
+      faraday (~> 0.8)
       addressable (~> 2.4.0)
       descendants_tracker (~> 0.0.4)
       faraday (~> 0.8, < 0.10)
       hashie (>= 3.4)
+      multi_json (>= 1.7.5, < 2.0)
       oauth2 (~> 1.0)
     hashie (3.4.6)
+    i18n (0.7.0)
     iniparse (1.4.2)
     json (1.8.3)
     jwt (1.5.6)
+    minitest (5.9.0)
     multi_json (1.12.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
@@ -92,6 +106,8 @@ GEM
     thor (0.19.1)
     thread_safe (0.3.5)
     tins (1.6.0)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
     unicode-display_width (1.1.1)
 
 PLATFORMS
diff --git a/github_changelog_generator.gemspec b/github_changelog_generator.gemspec
index d6e1f35..cc34887 100644
--- a/github_changelog_generator.gemspec
+++ b/github_changelog_generator.gemspec
@@ -28,4 +28,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "github_api", ">= 0.14"
   spec.add_runtime_dependency "rainbow", ">= 2.1"
   spec.add_runtime_dependency("octokit", ["~> 4.0"])
+  spec.add_runtime_dependency("faraday-http-cache")
+  spec.add_runtime_dependency("activesupport")
 end
diff --git a/lib/github_changelog_generator.rb b/lib/github_changelog_generator.rb
index 44b584c..558b451 100755
--- a/lib/github_changelog_generator.rb
+++ b/lib/github_changelog_generator.rb
@@ -3,6 +3,9 @@
 
 require "github_api"
 require "octokit"
+require 'faraday-http-cache'
+require "logger"
+require "active_support"
 require "json"
 require "benchmark"
 
diff --git a/lib/github_changelog_generator/octo_fetcher.rb b/lib/github_changelog_generator/octo_fetcher.rb
index 7b6fa3b..53ec212 100644
--- a/lib/github_changelog_generator/octo_fetcher.rb
+++ b/lib/github_changelog_generator/octo_fetcher.rb
@@ -27,10 +27,26 @@ module GitHubChangelogGenerator
       @github_options[:access_token] = @github_token unless @github_token.nil?
       @github_options[:api_endpoint] = @options[:github_endpoint] unless @options[:github_endpoint].nil?
 
+      init_middleware
       client_type = @options[:github_endpoint].nil? ? Octokit::Client : Octokit::EnterpriseAdminClient
       @client     = client_type.new(@github_options)
     end
 
+    def init_middleware
+      middleware_opts = {
+        :serializer   => Marshal,
+        :store        => ActiveSupport::Cache::FileStore.new('/tmp/cache'),
+        :logger       => Logger.new('/tmp/github-changelog-logger.log'),
+        :shared_cache => false
+      }
+      stack = Faraday::RackBuilder.new do |builder|
+        builder.use Faraday::HttpCache, middleware_opts
+        builder.use Octokit::Response::RaiseError
+        builder.adapter Faraday.default_adapter
+        # builder.response :logger
+      end
+      Octokit.middleware = stack
+    end
 
     # Fetch all tags from repo
     #