Pre-create all builds for Pipeline when a trigger is received

This change simplifies a Pipeline processing by introducing a special new status: created.
This status is used for all builds that are created for a pipeline.
We are then processing next stages and queueing some of the builds (created -> pending) or skipping them (created -> skipped).
This makes it possible to simplify and solve a few ordering problems with how previously builds were scheduled.
This also allows us to visualise a full pipeline (with created builds).

This also removes an after_touch used for updating a pipeline state parameters.
Right now in various places we explicitly call a reload_status! on pipeline to force it to be updated and saved.

2 files changed, 10 insertions, 0 deletions

diff --git a/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb b/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb
new file mode 100644
index 00000000000..756910a1fa0
--- /dev/null
+++ b/db/migrate/20160716115711_add_queued_at_to_ci_builds.rb
@@ -0,0 +1,9 @@
+class AddQueuedAtToCiBuilds < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :ci_builds, :queued_at, :timestamp
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b795eeaa23c..e0c6178a5a0 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -172,6 +172,7 @@ ActiveRecord::Schema.define(version: 20160810102349) do
     t.integer  "artifacts_size"
     t.string   "when"
     t.text     "yaml_variables"
+    t.datetime "queued_at"
   end
 
   add_index "ci_builds", ["commit_id", "stage_idx", "created_at"], name: "index_ci_builds_on_commit_id_and_stage_idx_and_created_at", using: :btree