GitHub - cloud-barista/cb-log: cb-log is the logger library for the Cloud-Barista Multi-Cloud Framework.

cb-log

cb-log is a logger library for the Cloud-Barista Multi-Cloud Framework.

[NOTE]
cb-log is currently under development.
So, we do not recommend using the current release in production.
Please note that the functionalities of cb-log are not stable and secure yet.
If you have any difficulties in using cb-log, please let us know.
(Open an issue or Join the cloud-barista Slack)

[목 차]

실행 환경
설치 방법
설정 방법
활용 예시

[실행 환경]

배포환경: Ubuntu 18.04, Docker 19.03, Go 1.15
개발환경: Ubuntu 20.04, Ubuntu 18.04, Debian 10.6, macOS Catalina 10.15, Android 8.1
- latest Docker, latest Go

[설치 방법]

Go 설치

$ sudo apt update
$ sudo apt install -y make gcc
$ sudo snap install go --classic

cb-log 설치 방법
- 모듈 다운로드 방법(Go Module mode, default)
  - cb-log 응용 개발
    - 응용 예시: $ wget https://raw.githubusercontent.com/cloud-barista/cb-log/master/test/test.go
  - 모듈 초기화: $ go mod init test.go
  - 모듈 다운로드: $ go mod tidy
  - 다운로드 위치 예시: /home/ubuntu/go/pkg/mod/github.com/cloud-barista/cb-log@v0.3.1
- 소스 다운로드 방법(Old GOPATH mode):
  - 소스 다운로드: $ go get -u -v github.com/cloud-barista/cb-log
  - 다운로드 위치 예시: /home/ubuntu/go/src/github.com/cloud-barista/cb-log

[설정 방법]

설정 정보

Configurations	Descriptions	Default
loglevel	로그 레벨 설정. 설정값: trace, debug, info, warn, error, fatal, panic	info
logfile	로그 파일 출력 여부 설정. 설정값: true, false	true
logfileinfo:	----- 이하 logfile true 일때 유효 -----
filename	로그를 저장할 파일 path 및 이름. 설정값: {path}logfilename	./log/cblogs.log
maxsize	개별 로그 파일 크기. 설정값: integer #megabytes	10
maxbackups	로그 파일 개수. 설정값: integer #number	50
maxage	로그 파일 유지 기간. 설정값: integer #days	31

설정 파일 예시

$ wget -r -nH --cut-dirs=3 https://raw.githubusercontent.com/cloud-barista/cb-log/master/conf/log_conf.yaml

$ vi ./conf/log_conf.yaml

#### Config for CB-Log Lib. ####

cblog:
  ## trace | debug | info | warn/warning | error | fatal | panic
  loglevel: error # The log level can be changed dynamically by editing this file.

  ## true | false
  logfile: true

## Config for File Output ##
logfileinfo:
  filename: ./log/cblogs.log
  maxsize: 10 # megabytes
  maxbackups: 50
  maxage: 31 # days

설정 적용 방법
- 자동 반영: 설정 파일 수정시 즉시 반영 (파일 변경 이벤트 감지)
설정파일 위치 지정 방법
- 환경변수 사용 방법:
  - 환경변수 CBLOG_ROOT 설정: (ex) export CBLOG_ROOT=$HOME/go/src/github.com/cloud-barista/cb-log
  - 설정파일 위치: $CBLOG_ROOT/conf/log_conf.yaml
- 설정파일 지정 방법:
  - 설정파일 생성: (ex) /etc/my_conf.yaml
  - 코드 내 설정파일 위치 설정: GetLoggerWithConfigPath() 이용
```
import (
  "github.com/cloud-barista/cb-log"
  "github.com/sirupsen/logrus"
)

var cblogger *logrus.Logger

func init() {
  // cblog is a global variable.
  cblogger = cblog.GetLoggerWithConfigPath("MY_PROJ", "/etc/my_conf.yaml")
}
```

[활용 예시]

기본 사용 예시: GetLogger(), SetLevel(), GetLevel(), WithFields()

대상 소스: https://github.com/cloud-barista/cb-log/blob/master/test/test.go

실행 및 결과:

$ export CBLOG_ROOT=$HOME/go/src/github.com/cloud-barista/cb-log
$ cd $CBLOG_ROOT/test
$ go run test.go   # setup cb-log with $CBLOG_ROOT/conf/log_conf.yaml

####LogLevel: info
[CB-SPIDER].[INFO]: 2021-02-14 11:16:49 test.go:24, main.main() - Log Info message
[CB-SPIDER].[WARNING]: 2021-02-14 11:16:49 test.go:25, main.main() - Log Waring message
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:26, main.main() - Log Error message
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:27, main.main() - Log Error message:internal error message

####LogLevel: warning
[CB-SPIDER].[WARNING]: 2021-02-14 11:16:49 test.go:32, main.main() - Log Waring message
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:33, main.main() - Log Error message
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:34, main.main() - Log Error message:internal error message

####LogLevel: error
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:40, main.main() - Log Error message
[CB-SPIDER].[ERROR]: 2021-02-14 11:16:49 test.go:41, main.main() - Log Error message:internal error message

####LogLevel: debug
[CB-SPIDER].[DEBUG]: 2021-02-14 11:16:49 test.go:46, main.main() - WithField 테스트 	[TestField=test]
[CB-SPIDER].[DEBUG]: 2021-02-14 11:16:49 test.go:48, main.main() - WithFields 테스트 	[Field2=value2,Field3=value3,Field1=value1]
[CB-SPIDER].[DEBUG]: 2021-02-14 11:16:49 test.go:50, main.main() - WithError 테스트 	[error=테스트 오류]

활용 예시: DBMS 응용 로그 예시

설정파일 환경변수 지정 방법

환경변수 설정: export CBLOG_ROOT=$HOME/go/src/github.com/cloud-barista/cb-log
대상 소스: https://github.com/cloud-barista/cb-log/blob/master/test/sample.go

실행 및 결과

$ export CBLOG_ROOT=$HOME/go/src/github.com/cloud-barista/cb-log   
$ cd $CBLOG_ROOT/test  
$ go run sample.go   # setup cb-log with $CBLOG_ROOT/conf/log_conf.yaml

[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:25, main.main() - start.........
[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:45, main.createUser1() - start creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:59, main.createUser1() - finish creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:64, main.createUser2() - start creating user.
[CB-SPIDER].[ERROR]: 2019-08-16 23:22:51 sample.go:69, main.createUser2() - DBMS Session is closed!!
[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:78, main.createUser2() - finish creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:51 sample.go:37, main.main() - end.........

[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:25, main.main() - start.........
[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:45, main.createUser1() - start creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:59, main.createUser1() - finish creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:64, main.createUser2() - start creating user.
[CB-SPIDER].[ERROR]: 2019-08-16 23:22:53 sample.go:69, main.createUser2() - DBMS Session is closed!!
[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:78, main.createUser2() - finish creating user.
[CB-SPIDER].[INFO]: 2019-08-16 23:22:53 sample.go:37, main.main() - end.........

Log Level 변경 및 실행 결과: debug => error

$ cd $CBLOG_ROOT/test
$ vi $CBLOG_ROOT/conf/log_conf.yaml  ## debug => error
$ go run sample.go   # setup cb-log with a user defined configuration file in code
[CB-SPIDER].[ERROR]: 2019-08-16 23:22:57 sample.go:69, main.createUser2() - DBMS Session is closed!!
[CB-SPIDER].[ERROR]: 2019-08-16 23:22:59 sample.go:69, main.createUser2() - DBMS Session is closed!!

설정파일 지정 방법: GetLoggerWithConfigPath()

대상 소스: https://github.com/cloud-barista/cb-log/blob/master/test/sample-with-config-path.go

실행 및 결과

$ cd ./test
$ go run sample-with-config-path.go   # setup cb-log with a user defined configuration file in code

[CB-SPIDER ..\conf\log_conf.yaml]
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:27, main.main() - start.........
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:48, main.createUser3() - start creating user.
[CB-SPIDER].[DEBUG]: 2020-12-23 17:46:09 sample-with-config-path.go:58, main.createUser3() - msg for debugging msg!!
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:63, main.createUser3() - finish creating user.
[CB-SPIDER].[DEBUG]: 2020-12-23 17:46:09 sample-with-config-path.go:30, main.main() - msg for debugging msg!!
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:68, main.createUser4() - start creating user.
[CB-SPIDER].[ERROR]: 2020-12-23 17:46:09 sample-with-config-path.go:73, main.createUser4() - DBMS Session is closed!!
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:82, main.createUser4() - finish creating user.
[CB-SPIDER].[INFO]: 2020-12-23 17:46:09 sample-with-config-path.go:40, main.main() - end.........

Log Level 변경 및 실행 결과: debug => error

$ cd ./test
$ vi ../conf/log_conf.yaml  ## debug => error
$ go run sample-with-config-path.go   # setup cb-log with a user defined configuration file in code
[CB-SPIDER].[ERROR]: 2020-12-23 18:08:12 sample-with-config-path.go:73, main.createUser4() - DBMS Session is closed!!
[CB-SPIDER].[ERROR]: 2020-12-23 18:08:14 sample-with-config-path.go:73, main.createUser4() - DBMS Session is closed!!

Name		Name	Last commit message	Last commit date
.github		.github
conf		conf
formatter		formatter
test		test
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
LICENSE		LICENSE
README.md		README.md
cblogger.go		cblogger.go
cblogger_test.go		cblogger_test.go
config.go		config.go
go.mod		go.mod
go.sum		go.sum
setup.env		setup.env

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