From 830198b75c1fc75791187455f7976f0a87493ef7 Mon Sep 17 00:00:00 2001
From: Kamil Trzcinski <ayufan@ayufan.eu>
Date: Tue, 21 Mar 2017 13:58:31 +0100
Subject: Improve resiliency of build picking

Every time we pick a new build, or we get into conflict we force runner to retry the operation to make sure that all builds are being picked.

It makes us to loose one request, but also makes sure that we are consistent.

It is fair trade, as number of generated builds is relatively small 0.1% compared to the traffic.
---
 lib/api/runner.rb | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

(limited to 'lib/api/runner.rb')

diff --git a/lib/api/runner.rb b/lib/api/runner.rb
index 4c9db2c8716..4f27c14d8e8 100644
--- a/lib/api/runner.rb
+++ b/lib/api/runner.rb
@@ -74,31 +74,44 @@ module API
       end
       post '/request' do
         authenticate_runner!
-        no_content! unless current_runner.active?
         update_runner_info
 
         if current_runner.is_runner_queue_value_latest?(params[:last_update])
-          header 'X-GitLab-Last-Update', params[:last_update]
-          Gitlab::Metrics.add_event(:build_not_found_cached)
+          Gitlab::Metrics.add_event(:build_not_found_cached,
+            version: get_runner_version)
+          header_last_update(params[:last_update])
           return no_content!
         end
 
         new_update = current_runner.ensure_runner_queue_value
+
+        unless current_runner.active?
+          Gitlab::Metrics.add_event(:runner_inactive,
+            version: get_runner_version)
+          header_last_update(new_update)
+          return no_content!
+        end
+
         result = ::Ci::RegisterJobService.new(current_runner).execute
 
         if result.valid?
           if result.build
             Gitlab::Metrics.add_event(:build_found,
-                                      project: result.build.project.path_with_namespace)
+              project: result.build.project.path_with_namespace,
+              version: get_runner_version)
+            header_last_update(current_runner.tick_runner_queue_value)
             present result.build, with: Entities::JobRequest::Response
           else
-            Gitlab::Metrics.add_event(:build_not_found)
-            header 'X-GitLab-Last-Update', new_update
+            Gitlab::Metrics.add_event(:build_not_found,
+              version: get_runner_version)
+            header_last_update(new_update)
             no_content!
           end
         else
           # We received build that is invalid due to concurrency conflict
-          Gitlab::Metrics.add_event(:build_invalid)
+          Gitlab::Metrics.add_event(:build_invalid,
+            version: get_runner_version)
+          header_last_update(current_runner.tick_runner_queue_value)
           conflict!
         end
       end
-- 
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