Coaster

Object Translation

Translate by object class name.

                                  # Translation key
Coupon._translate                 #=> en.class.Coupon.self
Coupon::Discount._translate       #=> en.class.Coupon.Discount.self
Coupon._translate('.title')       #=> en.class.Coupon.title
Coupon._translate('root')         #=> en.root

Pass translation params.

class Coupon
  class << self
    def _translation_params
      {name: 'Buzz'}
    end
  end
end

Coupon._translate #=> I18n.t('en.class.Coupon.self', {name: 'Buzz'})

Inheritance fallback.

class Order
end

class CreditCard < Order
end

# in en.yml only defined Order translation.
# use superclass _translate
CreditCard._translate #=> I18n.t('en.class.CreditCard.self') not exists
                      #=> I18n.t('en.class.Order.self') returned

instance 에서도 사용할 수 있다.

Foo::Bar.new._translate            #=> return translation 'class.Foo.Bar.self'
Foo::Bar.new._translate('.title')  #=> return translation 'class.Foo.Bar.title'
Foo::Bar.new._translate('title')   #=> return translation 'title'
Foo::Bar.new._translate(:force)    #=> ignore 'message' even if message exists

그런데 다른점은 instance에 message 메서드가 존재할 경우 다음과 같이 message를 활용한다.

error = Order::Error.new('error message')
error._translate(:force) #=> "error message"

StandardError features

아래는 동일하다.

raise Order::Error, 'order error occurred'
raise Order::Error, {message: 'order error occurred'}
raise Order::Error, {msg: 'order error occurred'}
raise Order::Error, {m: 'order error occurred'}

에러에 추가로 attribute를 추가하고 싶다면 Hash에 아무거나 넣으면 된다.

ex = catch { raise Order::Error, {m: 'message', order: order} }
ex.attributes[:order] #=> order instance

Hash로 전달되는 특수한 attribute가 있다.

desc, description: ex.description으로 꺼낼 수 있다. ex.message는 사용자 친화적이지 않은 메시지라서 사용자 친화적인 메시지를 넣으려면 description을 쓰면 된다. description이 없으면 message를 리턴한다.
obj, object: ex.object로 꺼낼수 있다.
http_status: ex.http_status로 꺼낼수 있다. 기본값은 Error Class에서 지정된 상수값.

그 외에 error instance variable로 등록되는 attribute가 있다.

tags: ActiveSupport::TaggedLogging에 사용된다.
level: debug, info 등등의 로깅 레벨
tkey: Object Translation 에서 사용된다. 기본값은 '.self'와 동일하다.

StandardError#logging

StandardError#logging으로 로깅한다.
logger는 Coaster.logger=를 사용하며 설정이 안돼있을 경우 Rails.logger를 사용한다.
cleaner(AcitveSupport::BacktraceCleaner)는 StandardError.cleaner=, StandardError.cause_cleaner=를 사용하며 기본값은 없으며 cleaner가 없을 경우 backtrace를 출력하지 않는다.

options
1. :logger => 기본 logger를 대체할 logger
2. :cleaner => 해당 에러를 로깅할때 사용할 cleaner
before_logging_blocks, after_loggin_blocks
1. logging 전후 처리를 추가할 수 있으며 추가된 block은 error instance 내에서 실행된다.
2. ```
StandardError.before_logging(:cloudwatch) do
  ReportCloudWatch.send(self) # self가 에러 자신
end
```
log 내용은 StandardError#to_detail을 사용
Sentry 아래와 같이 require를 하면 logging 하기 전 sentry에 보낸다.
```
require 'coaster/core_ext/standard_error/sentry'
```
(raven.rb는 legacy, 옛날 sentry gem 이름)

StandardError#to_detail

logging 메서드에서 출력한 메시지를 만든다.

error class, status, message, instance_variables(, backtrace) 순서대로 출력하며
cause가 존재할 경우 CAUSE이후 tab indent를 하여 출력한다. cause는 최대 3 depth까지 출력한다.
instance_variable
1. StandardError.detail_vars Array에서 있는 값의 출력은 StandardError.detail_value_proc으로 출력한다.
2. detail_vars 기본값은 %i[@attributes @tkey @fingerprint @tags @level]
3. detail_value_proc 기본값은 Proc.new{|val| val.inspect}
4. 나머지는 StandardError.detail_value_simpe로 처리하며 class name만 사용한다.

coaster/rails_ext/backtrace_cleaner

AcitveSupport::BacktraceCleaner에서 앞쪽은 silence!에서 제외하는(즉 모든 backtrace가 포함되는) 로직이 추가된다.
앞쪽에서 얼마나 포함할지는 cleaner.minimum_first=로 설정하며 기본값은 10이다.
minimum_first 이후 silence된 backtrace사이에 BacktraceCleaner.minimum_first ... and next silenced backtraces라인이 끼워진다.

StandardError logging example with backtrace cleaner

[Dynamoid::Errors::RecordNotUnique] status:999999
	MESSAGE: Attempted to write record #<DynamoUserIdentificationLog:0x00005592491a7378> when its key already exists
	@attributes: {}
	@fingerprint: [:default, :class]
	@inner_exception: Attempted to write record #<DynamoUserIdentificationLog:0x00005592491a7378> when its key already exists
	@level: "error"
	@original_exception: Dynamoid::Errors::ConditionalCheckFailedException
	@raven: {}
	@tags: {}
	@tkey: nil
	BACKTRACE:
		dynamoid (3.7.1) lib/dynamoid/persistence/save.rb:30:in `rescue in call'
		dynamoid (3.7.1) lib/dynamoid/persistence/save.rb:15:in `call'
		dynamoid (3.7.1) lib/dynamoid/persistence/save.rb:8:in `call'
		dynamoid (3.7.1) lib/dynamoid/persistence.rb:485:in `block (2 levels) in save'
		activesupport (6.1.4.4) lib/active_support/callbacks.rb:106:in `run_callbacks'
		dynamoid (3.7.1) lib/dynamoid/persistence.rb:484:in `block in save'
		activesupport (6.1.4.4) lib/active_support/callbacks.rb:106:in `run_callbacks'
		dynamoid (3.7.1) lib/dynamoid/persistence.rb:483:in `save'
		dynamoid (3.7.1) lib/dynamoid/dirty.rb:50:in `save'
		dynamoid (3.7.1) lib/dynamoid/validations.rb:19:in `save'
		BacktraceCleaner.minimum_first ... and next silenced backtraces
		exmaple_app/app/models/dynamo_user_identification_log.rb:39:in `record!'
		exmaple_app/app/models/sample_model.rb:156:in `record_authentication_log'
		vendor/bundle/ruby/2.7.0/bin/rspec:25:in `load'
		vendor/bundle/ruby/2.7.0/bin/rspec:25:in `<top (required)>'
		/home/circleci/.rubygems/bin/bundle:25:in `load'
		/home/circleci/.rubygems/bin/bundle:25:in `<main>'
	CAUSE: [Dynamoid::Errors::ConditionalCheckFailedException] status:999999
		MESSAGE: The conditional request failed
		@attributes: {}
		@fingerprint: [:default, :class]
		@inner_exception: Aws::DynamoDB::Errors::ConditionalCheckFailedException
		@level: "error"
		@raven: {}
		@tags: {}
		@tkey: nil
		BACKTRACE:
			dynamoid (3.7.1) lib/dynamoid/adapter_plugin/aws_sdk_v3.rb:471:in `rescue in put_item'
			dynamoid (3.7.1) lib/dynamoid/adapter_plugin/aws_sdk_v3.rb:462:in `put_item'
			dynamoid (3.7.1) lib/dynamoid/adapter.rb:153:in `block (3 levels) in <class:Adapter>'
			dynamoid (3.7.1) lib/dynamoid/adapter.rb:56:in `benchmark'
			dynamoid (3.7.1) lib/dynamoid/adapter.rb:153:in `block (2 levels) in <class:Adapter>'
			dynamoid (3.7.1) lib/dynamoid/adapter.rb:71:in `write'
			dynamoid (3.7.1) lib/dynamoid/persistence/save.rb:24:in `call'
			dynamoid (3.7.1) lib/dynamoid/persistence/save.rb:8:in `call'
			dynamoid (3.7.1) lib/dynamoid/persistence.rb:485:in `block (2 levels) in save'
			activesupport (6.1.4.4) lib/active_support/callbacks.rb:106:in `run_callbacks'
			BacktraceCleaner.minimum_first ... and next silenced backtraces
			exmaple_app/app/models/dynamo_user_identification_log.rb:39:in `record!'
			exmaple_app/app/models/sample_model.rb:156:in `record_authentication_log'
			vendor/bundle/ruby/2.7.0/bin/rspec:25:in `load'
			vendor/bundle/ruby/2.7.0/bin/rspec:25:in `<top (required)>'
			/home/circleci/.rubygems/bin/bundle:25:in `load'
			/home/circleci/.rubygems/bin/bundle:25:in `<main>'
		CAUSE: [Aws::DynamoDB::Errors::ConditionalCheckFailedException] status:999999
			MESSAGE: The conditional request failed
			@attributes: {}
			@code: ConditionalCheckFailedException
			@context: Seahorse::Client::RequestContext
			@data: Aws::DynamoDB::Types::ConditionalCheckFailedException
			@fingerprint: [:default, :class]
			@level: "error"
			@message: The conditional request failed
			@raven: {}
			@tags: {}
			@tkey: nil
			BACKTRACE:
				aws-sdk-core (3.130.0) lib/seahorse/client/plugins/raise_response_errors.rb:17:in `call'
				aws-sdk-dynamodb (1.69.0) lib/aws-sdk-dynamodb/plugins/simple_attributes.rb:119:in `call'
				aws-sdk-core (3.130.0) lib/aws-sdk-core/plugins/jsonvalue_converter.rb:22:in `call'
				aws-sdk-core (3.130.0) lib/aws-sdk-core/plugins/idempotency_token.rb:19:in `call'
				aws-sdk-core (3.130.0) lib/aws-sdk-core/plugins/param_converter.rb:26:in `call'
				aws-sdk-core (3.130.0) lib/seahorse/client/plugins/request_callback.rb:71:in `call'
				aws-sdk-core (3.130.0) lib/aws-sdk-core/plugins/response_paging.rb:12:in `call'
				aws-sdk-core (3.130.0) lib/seahorse/client/plugins/response_target.rb:24:in `call'
				aws-sdk-core (3.130.0) lib/seahorse/client/request.rb:72:in `send_request'
				aws-sdk-dynamodb (1.69.0) lib/aws-sdk-dynamodb/client.rb:4147:in `put_item'
				BacktraceCleaner.minimum_first ... and next silenced backtraces
				example_app/app/models/dynamo_user_identification_log.rb:39:in `record!'
				example_app/app/models/sample_model.rb:156:in `record_authentication_log'
				vendor/bundle/ruby/2.7.0/bin/rspec:25:in `load'
				vendor/bundle/ruby/2.7.0/bin/rspec:25:in `<top (required)>'
				/home/circleci/.rubygems/bin/bundle:25:in `load'
				/home/circleci/.rubygems/bin/bundle:25:in `<main>'

coaster

Development