Add retry middleware.

lib/lucid_shopify/middleware/graceful_429.rb

@@ -13,15 +13,13 @@ def call( env )
             raise Shopify429Error
           end
         end
-
       rescue Shopify429Error
         delay = ( attempts += 1 ) ** 2
 
         log_error "API call limit reached, retrying in #{delay * 1000} msec ..."
 
         sleep delay
         retry
-
       end
     end
 

lib/lucid_shopify/middleware/retry.rb

@@ -0,0 +1,30 @@
+module LucidShopify::Middleware
+  class Retry < LucidShopify::Middleware::Base
+
+    ATTEMPTS = 3
+    DELAY = 0.1
+    EXCEPTIONS = [
+      Faraday::Error::ConnectionFailed,
+      Faraday::Error::TimeoutError
+    ]
+
+    # Retries on connection and timeout errors.
+    #
+    def call( env )
+      attempts = 0
+
+      begin
+        app.call( env.dup )
+      rescue *EXCEPTIONS => e
+        attempts += 1
+        raise e if attempts >= ATTEMPTS
+
+        log_error "Connection failed, retrying in #{DELAY * 1000} msec ..."
+
+        sleep DELAY
+        retry
+      end
+    end
+
+  end
+end

lib/lucid_shopify/session.rb

@@ -19,7 +19,7 @@ def self.for_shop( shop, options = {} )
   private
 
   def _middleware
-    %i{ Graceful429 CallLogger Token }.map do |middleware|
+    %i{ Retry Graceful429 CallLogger Token }.map do |middleware|
       LucidShopify::Middleware.const_get( middleware )
     end
   end

lib/lucid_shopify/version.rb

@@ -1,5 +1,5 @@
 module LucidShopify
 
-  VERSION = '0.2.2'
+  VERSION = '0.2.3'
 
 end