Bring JsonLogger to CE

This backports a module that was in EE for Geo so that other modules
can have structured logging support.

1 files changed, 29 insertions, 0 deletions

diff --git a/spec/lib/gitlab/json_logger_spec.rb b/spec/lib/gitlab/json_logger_spec.rb
new file mode 100644
index 00000000000..0a62785f880
--- /dev/null
+++ b/spec/lib/gitlab/json_logger_spec.rb
@@ -0,0 +1,29 @@
+# coding: utf-8
+require 'spec_helper'
+
+describe Gitlab::JsonLogger do
+  subject { described_class.new('/dev/null') }
+
+  let(:now) { Time.now }
+
+  describe '#format_message' do
+    it 'formats strings' do
+      output = subject.format_message('INFO', now, 'test', 'Hello world')
+      data = JSON.parse(output)
+
+      expect(data['severity']).to eq('INFO')
+      expect(data['time']).to eq(now.utc.iso8601(3))
+      expect(data['message']).to eq('Hello world')
+    end
+
+    it 'formats hashes' do
+      output = subject.format_message('INFO', now, 'test', { hello: 1 })
+      data = JSON.parse(output)
+
+      expect(data['severity']).to eq('INFO')
+      expect(data['time']).to eq(now.utc.iso8601(3))
+      expect(data['hello']).to eq(1)
+      expect(data['message']).to be_nil
+    end
+  end
+end