better caching to avoid hitting rate limits

Gemfile

@@ -5,8 +5,6 @@ gem 'sinatra'
 group :development do
   gem 'shotgun'
   gem 'thin'
-  gem 'ruby-debug', :platforms => :mri_18
-  gem 'ruby-debug19', :require => 'ruby-debug', :platforms => :mri_19
 end
 
 gem 'haml'

Gemfile.lock

@@ -7,13 +7,11 @@ GEM
       i18n (~> 0.4)
     activesupport (3.0.5)
     addressable (2.2.6)
-    archive-tar-minitar (0.5.2)
     bson (1.4.0)
     bson_ext (1.4.0)
     builder (2.1.2)
     choices (0.2.4)
       hashie (>= 0.4.0)
-    columnize (0.3.2)
     compass (0.10.6)
       haml (>= 3.0.4)
     daemons (1.1.2)
@@ -31,9 +29,6 @@ GEM
     indextank (1.0.12)
       faraday-stack
       yajl-ruby (>= 0.7.7)
-    linecache (0.43)
-    linecache19 (0.5.11)
-      ruby_core_source (>= 0.1.4)
     mingo (0.4.2)
       mongo (>= 1.3)
     mongo (1.4.0)
@@ -47,26 +42,11 @@ GEM
       rack
     rack (1.3.0)
     rake (0.9.2)
-    ruby-debug (0.10.4)
-      columnize (>= 0.1)
-      ruby-debug-base (~> 0.10.4.0)
-    ruby-debug-base (0.10.4)
-      linecache (>= 0.3)
-    ruby-debug-base19 (0.11.24)
-      columnize (>= 0.3.1)
-      linecache19 (>= 0.5.11)
-      ruby_core_source (>= 0.1.4)
-    ruby-debug19 (0.11.6)
-      columnize (>= 0.3.1)
-      linecache19 (>= 0.5.11)
-      ruby-debug-base19 (>= 0.11.19)
-    ruby_core_source (0.1.4)
-      archive-tar-minitar (>= 0.5.2)
     shotgun (0.9)
       rack (>= 1.0)
     sinatra (1.2.6)
       rack (~> 1.1)
-      tilt (< 2.0, >= 1.2.2)
+      tilt (>= 1.2.2, < 2.0)
     thin (1.2.11)
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)
@@ -94,8 +74,6 @@ DEPENDENCIES
   mongo_ext
   never-forget
   rake
-  ruby-debug
-  ruby-debug19
   shotgun
   sinatra
   thin

app.rb

@@ -8,6 +8,7 @@
 require 'active_support/core_ext/numeric/time'
 require 'active_support/core_ext/integer/time'
 require 'active_support/core_ext/time/acts_like'
+require 'lib/instagram/failsafe_store'
 require 'addressable/uri'
 require 'digest/md5'
 require 'haml'
@@ -43,9 +44,9 @@
     config.send("#{key}=", value)
   end
 
-  config.cache = ActiveSupport::Cache::FileStore.new settings.cache_dir,
-    namespace: 'instagram',
-    expires_in: settings.production? ? 3.minutes : 1.hour
+  config.cache = Instagram::FailsafeStore.new settings.cache_dir,
+    namespace: 'instagram', expires_in: 20.minutes,
+    exceptions: %w[Faraday::Error::ClientError Timeout::Error JSON::ParserError]
 end
 
 configure :development, :production do

lib/instagram/failsafe_store.rb

@@ -46,7 +46,13 @@ def fetch(name, options = nil)
     private
 
     def ignore_exception?(ex)
-      options[:exceptions] && options[:exceptions].any? { |klass| ex.is_a? klass }
+      options[:exceptions] && options[:exceptions].any? { |klass|
+        if klass.respond_to?(:to_str)
+          ex.class.name == klass.to_str
+        else
+          ex.is_a? klass
+        end
+      }
     end
   end
 end