Add latest changes from gitlab-org/gitlab@master

1 files changed, 23 insertions, 0 deletions

diff --git a/config/initializers/snowplow_tracker.rb b/config/initializers/snowplow_tracker.rb
new file mode 100644
index 00000000000..3c730e03738
--- /dev/null
+++ b/config/initializers/snowplow_tracker.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# Gitlab.com uses Snowplow for identifying users and events.
+# https://gitlab.com/gitlab-org/gitlab/issues/6329
+#
+# SnowplowTracker write log into STDERR
+# https://github.com/snowplow/snowplow-ruby-tracker/blob/39fcfa2be793f2e25e73087a9700abc93f43b5e8/lib/snowplow-tracker/emitters.rb#L23
+#     `LOGGER = Logger.new(STDERR)`
+#
+# In puma.rb, if `stdout_redirect` specify stderr, Puma will overwrite STDERR in:
+# https://github.com/puma/puma/blob/b41205f5cacbc2ad0060472bdce68ba636f42175/lib/puma/runner.rb#L134
+#    `STDERR.reopen stderr, (append ? "a" : "w")`
+# As a result, SnowplowTracker will log into Puma stderr, when Puma enabled.
+#
+# By default, SnowplowTracker uses default log formatter.
+# When enable Puma, SnowplowTracker log is expected to be JSON format, as part of puma_stderr.log.
+# Hence overwrite ::SnowplowTracker::LOGGER.formatter to JSON formatter
+
+if defined?(::Puma) && defined?(::SnowplowTracker::LOGGER)
+  ::SnowplowTracker::LOGGER.formatter = proc do |severity, datetime, progname, msg|
+    { severity: severity, timestamp: datetime.utc.iso8601(3), pid: $$, progname: progname, message: msg }.to_json << "\n"
+  end
+end