[Why] The built-in log system prints logs in string format by default. The logs should be formatted in json format for subsequent analysis and processing.

[Example1] use: log.info("test") output: {"level":"INFO","level_num":1,"datetime":"2020-11-19 16:57:17+0800","progname":null,"message":"test"}

[Example2] use: log.error({"job_id" => "1", "job_state" => "submit"}.to_json) output: {"level":"ERROR","level_num":3,"datetime":"2020-11-19 16:57:17+0800","progname":null,"message":"", "job_id":"1","job_state":"submit","caller":["/usr/share/ruby/logger.rb:545:in `error'","./test.rb:6:in`<main>'"]}

Signed-off-by: Wu Zhende wuzhende666@163.com --- lib/log.rb | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 lib/log.rb

diff --git a/lib/log.rb b/lib/log.rb new file mode 100644 index 0000000..0ffc0f9 --- /dev/null +++ b/lib/log.rb @@ -0,0 +1,42 @@ +# SPDX-License-Identifier: MulanPSL-2.0+ +# Copyright (c) 2020 Huawei Technologies Co., Ltd. All rights reserved. +# frozen_string_literal: true + +require 'logger' +require 'json' + +# log class to print logs in JSON format +class Log < Logger + LEVEL_INFO = { + 'DEBUG' => 0, + 'INFO' => 1, + 'WARN' => 2, + 'ERROR' => 3, + 'FATAL' => 4, + 'UNKNOWN' => 5 + }.freeze + + FORMATTER = proc { |severity, datetime, progname, msg| + puts + level_num = LEVEL_INFO[severity] + begin + message = JSON.parse(msg) + rescue JSON::ParserError + message = { 'message' => msg } + end + h = { + 'level' => severity.to_s, + 'level_num' => level_num, + 'datetime' => datetime, + 'progname' => progname, + 'message' => '' + } + h.merge!(message) + h.merge!({ 'caller' => caller }) if level_num >= 2 + h.to_json + } + + def initialize(logdev = STDOUT, formatter = FORMATTER) + super(logdev, formatter: formatter) + end +end