Get the ETag from Redis on a GET request

This prevents doing a network request when we would return a 304 anyway

lib/remote_storage/rest_provider.rb

@@ -46,17 +46,18 @@ module RemoteStorage
     end
 
     def get_data(user, directory, key)
+      none_match = (server.env["HTTP_IF_NONE_MATCH"] || "").split(",")
+                                                           .map(&:strip)
+                                                           .map { |s| s.gsub(/^"?W\//, "") }
+      etag = redis.hget redis_metadata_object_key(user, directory, key), "e"
+      server.halt 304 if none_match.include? %Q("#{etag}")
+
       url = url_for_key(user, directory, key)
 
       res = do_get_request(url)
 
       set_response_headers(res)
 
-      none_match = (server.env["HTTP_IF_NONE_MATCH"] || "").split(",")
-                                                           .map(&:strip)
-                                                           .map { |s| s.gsub(/^"?W\//, "") }
-      server.halt 304 if none_match.include? format_etag(res.headers[:etag])
-
       return res.body
     rescue RestClient::ResourceNotFound
       server.halt 404, "Not Found"

spec/s3/app_spec.rb

@@ -639,7 +639,7 @@ describe "App" do
         header "Authorization", "Bearer amarillo"
 
         put_stub = OpenStruct.new(headers: {
-          etag: '"bla"'
+          etag: '"0815etag"'
         })
 
         RestClient.stub :put, put_stub do
@@ -684,16 +684,7 @@ describe "App" do
         it "responds with 304 when IF_NONE_MATCH header contains the ETag" do
           header "If-None-Match", "\"0815etag\""
 
-          get_stub = OpenStruct.new(body: "si", headers: {
-            etag: '"0815etag"',
-            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT",
-            content_type: "text/plain; charset=utf-8",
-            content_length: 2
-          })
-
-          RestClient.stub :get, get_stub do
           get "/phil/food/aguacate"
-          end
 
           last_response.status.must_equal 304
         end
@@ -701,16 +692,7 @@ describe "App" do
         it "responds with 304 when IF_NONE_MATCH header contains weak ETAG matching the current ETag" do
           header "If-None-Match", "W/\"0815etag\""
 
-          get_stub = OpenStruct.new(body: "si", headers: {
-            etag: '"0815etag"',
-            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT",
-            content_type: "text/plain; charset=utf-8",
-            content_length: 2
-          })
-
-          RestClient.stub :get, get_stub do
           get "/phil/food/aguacate"
-          end
 
           last_response.status.must_equal 304
         end
@@ -758,11 +740,11 @@ describe "App" do
           content["items"]["aguacate"].wont_be_nil
           content["items"]["aguacate"]["Content-Type"].must_equal "text/plain; charset=utf-8"
           content["items"]["aguacate"]["Content-Length"].must_equal 2
-          content["items"]["aguacate"]["ETag"].must_equal "bla"
+          content["items"]["aguacate"]["ETag"].must_equal "0815etag"
           content["items"]["camaron"].wont_be_nil
           content["items"]["camaron"]["Content-Type"].must_equal "text/plain; charset=utf-8"
           content["items"]["camaron"]["Content-Length"].must_equal 5
-          content["items"]["camaron"]["ETag"].must_equal "bla"
+          content["items"]["camaron"]["ETag"].must_equal "0815etag"
           content["items"]["desayunos/"].wont_be_nil
           content["items"]["desayunos/"]["ETag"].must_equal "dd36e3cfe52b5f33421150b289a7d48d"
         end

spec/swift/app_spec.rb

@@ -597,7 +597,7 @@ describe "App" do
         header "Authorization", "Bearer amarillo"
 
         put_stub = OpenStruct.new(headers: {
-          etag: "bla",
+          etag: "0815etag",
           last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
         })
 
@@ -639,18 +639,10 @@ describe "App" do
         end
 
         it "responds with 304 when IF_NONE_MATCH header contains the ETag" do
+
           header "If-None-Match", "\"0815etag\""
 
-          get_stub = OpenStruct.new(body: "si", headers: {
-            etag: "0815etag",
-            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT",
-            content_type: "text/plain; charset=utf-8",
-            content_length: 2
-          })
-
-          RestClient.stub :get, get_stub do
           get "/phil/food/aguacate"
-          end
 
           last_response.status.must_equal 304
         end
@@ -658,16 +650,7 @@ describe "App" do
         it "responds with 304 when IF_NONE_MATCH header contains weak ETAG matching the current ETag" do
           header "If-None-Match", "W/\"0815etag\""
 
-          get_stub = OpenStruct.new(body: "si", headers: {
-            etag: "0815etag",
-            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT",
-            content_type: "text/plain; charset=utf-8",
-            content_length: 2
-          })
-
-          RestClient.stub :get, get_stub do
           get "/phil/food/aguacate"
-          end
 
           last_response.status.must_equal 304
         end
@@ -715,11 +698,11 @@ describe "App" do
           content["items"]["aguacate"].wont_be_nil
           content["items"]["aguacate"]["Content-Type"].must_equal "text/plain; charset=utf-8"
           content["items"]["aguacate"]["Content-Length"].must_equal 2
-          content["items"]["aguacate"]["ETag"].must_equal "bla"
+          content["items"]["aguacate"]["ETag"].must_equal "0815etag"
           content["items"]["camaron"].wont_be_nil
           content["items"]["camaron"]["Content-Type"].must_equal "text/plain; charset=utf-8"
           content["items"]["camaron"]["Content-Length"].must_equal 5
-          content["items"]["camaron"]["ETag"].must_equal "bla"
+          content["items"]["camaron"]["ETag"].must_equal "0815etag"
           content["items"]["desayunos/"].wont_be_nil
           content["items"]["desayunos/"]["ETag"].must_equal "dd36e3cfe52b5f33421150b289a7d48d"
         end