First commit

.gitignore

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+/.bundle/
+/.yardoc
+/Gemfile.lock
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/

.rspec

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+--format documentation
+--color

.travis.yml

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+language: ruby
+rvm:
+  - 2.2.3
+before_install: gem install bundler -v 1.11.2

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in ougai.gemspec
+gemspec

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2016 Toshimitsu Takahashi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+Ougai
+=====
+
+A JSON logger is compatible with [bunyan](https://github.com/trentm/node-bunyan) for Node.js
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'ougai'
+```
+
+And then execute:
+
+```
+$ bundle
+```
+
+Or install it yourself as:
+
+```
+$ gem install ougai
+```
+
+## Usage
+
+Ougai::Logger is sub-class of original Logger in Ruby.
+
+```ruby
+require 'rubygems'
+require 'ougai'
+
+logger = Ougai::Logger.new(STDOUT)
+```
+
+### log only message
+
+```ruby
+logger.info('Information!')
+```
+
+```json
+{"name":"main","hostname":"mint","pid":14607,"level":30,"time":"2016-10-16T22:26:48.835+09:00","v":0,"msg":"Information!"}
+```
+
+### log with a message and custom data
+
+```ruby
+logger.debug('Debugging', data_id: 1, data_flag: true)
+logger.debug('Debug!', custom_data: { id: 1, name: 'something' })
+```
+
+```json
+{"name":"main","hostname":"mint","pid":14607,"level":20,"time":"2016-10-16T22:26:48.836+09:00","v":0,"msg":"Debugging","custom_data":{"id":1,"name":"something"}}
+{"name":"main","hostname":"mint","pid":14607,"level":20,"time":"2016-10-16T22:26:48.836+09:00","v":0,"msg":"Debug!","data_id":1,"data_flag":true}
+```
+
+### log with a message and an exception
+
+```ruby
+begin
+  raise StandardError, 'fatal error'
+rescue => ex
+  logger.fatal('Unexpected!', ex)
+end
+```
+
+```json
+{"name":"main","hostname":"mint","pid":14607,"level":60,"time":"2016-10-16T22:26:48.836+09:00","v":0,"msg":"Unexpected!","err":{"name":"StandardError","message":"fatal error","stack":"main.rb:12:in `<main>'"}}
+```
+
+### log with a message, an exception and custom data
+
+```ruby
+begin
+  1 / 0
+rescue => ex
+  logger.error('Caught error', ex, reason: 'zero spec')
+end
+```
+
+```json
+{"name":"main","hostname":"mint","pid":14607,"level":50,"time":"2016-10-16T22:26:48.836+09:00","v":0,"msg":"Caught error","err":{"name":"ZeroDivisionError","message":"divided by 0","stack":"main.rb:18:in `/'\n ...'"},"reason":"zero spec"}
+```
+
+
+## View log by node-bunyan
+
+Install [bunyan](https://github.com/trentm/node-bunyan) via NPM
+
+```
+$ npm install -g bunyan
+```
+
+Pass a log file to command `bunyan`
+
+```
+$ bunyan output.log
+[2016-10-16T22:26:48.835+09:00]  INFO: main/14607 on mint: Info message!
+[2016-10-16T22:26:48.836+09:00] DEBUG: main/14607 on mint: Debugging (data_id=1, data_flag=true)
+[2016-10-16T22:26:48.836+09:00] DEBUG: main/14607 on mint: Debug!
+    custom_data: {
+      "id": 1,
+      "name": "something"
+    }
+[2016-10-16T22:26:48.836+09:00] FATAL: main/14607 on mint: Unexpected!
+    main.rb:12:in `<main>'
+[2016-10-16T22:26:48.836+09:00] ERROR: main/14607 on mint: Caught error (reason="z
+    main.rb:18:in `/'
+      main.rb:18:in `<main>'
+```
+
+
+## License
+
+[MIT](LICENSE.txt)

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec

lib/ougai.rb

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+require "ougai/version"
+require 'logger'
+require 'socket'
+require 'time'
+require 'json'
+
+module Ougai
+  class Logger < Logger
+    def initialize(*args)
+      super(*args)
+      run_filename = File.basename($0, ".rb")
+      hostname = Socket.gethostname
+      @formatter = proc do |severity, time, progname, data|
+        JSON.generate({
+          name: progname || run_filename,
+          hostname: hostname,
+          pid: $$,
+          level: to_level(severity),
+          time: time.iso8601(3),
+          v: 0
+        }.merge(data)) + "\n"
+      end
+    end
+
+    def debug(message, ex = nil, data = {})
+      super(to_item(message, ex, data))
+    end
+
+    def info(message, ex = nil, data = {})
+      super(to_item(message, ex, data))
+    end
+
+    def warn(message, ex = nil, data = {})
+      super(to_item(message, ex, data))
+    end
+
+    def error(message, ex = nil, data = {})
+      super(to_item(message, ex, data))
+    end
+
+    def fatal(message, ex = nil, data = {})
+      super(to_item(message, ex, data))
+    end
+
+    private
+
+    def to_item(msg, ex, data)
+      item = {}
+      if ex.nil? && msg.is_a?(Exception)
+        item[:msg] = ex.to_s
+        item[:err] = serialize_ex(ex)
+      elsif ex
+        item[:msg] = msg
+        if ex.is_a?(Hash)
+          item.merge!(ex)
+        elsif ex.is_a?(Exception)
+          item[:err] = serialize_ex(ex)
+          item.merge!(data)
+        end
+      else
+        item[:msg] = msg
+        item.merge!(data)
+      end
+      item
+    end
+
+    def serialize_ex(ex)
+      err = {
+        name: ex.class.name,
+        message: ex.to_s
+      }
+      if ex.backtrace
+        err[:stack] = ex.backtrace.join("\n  ")
+      end
+      err
+    end
+
+    def to_level(severity)
+      case severity
+      when 'INFO'
+        30
+      when 'WARN'
+        40
+      when 'ERROR'
+        50
+      when 'FATAL'
+        60
+      else # DEBUG
+        20
+      end
+    end
+  end
+end

lib/ougai/version.rb

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+module Ougai
+  VERSION = "0.1.0"
+end

ougai.gemspec

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+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'ougai/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "ougai"
+  spec.version       = Ougai::VERSION
+  spec.authors       = ["Toshimitsu Takahashi"]
+  spec.email         = ["[email protected]"]
+
+  spec.summary       = %q{JSON logger compatible node-bunyan.}
+  spec.description   = %q{JSON logger compatible bunyan for Node.js}
+  spec.homepage      = "https://github.com/tilfin/ougai"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  spec.require_paths = ['lib']
+
+  spec.add_development_dependency "bundler", "~> 1.11"
+  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rspec", "~> 3.0"
+end