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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["filewriter","formatter","golang","log","logging","writers"],"created_at":"2024-07-30T20:01:36.922Z","updated_at":"2026-01-26T06:06:40.153Z","avatar_url":"https://github.com/subchen.png","language":"Go","readme":"go-log\n================\n\n[![GoDoc](https://godoc.org/github.com/subchen/go-log?status.svg)](https://godoc.org/github.com/subchen/go-log)\n[![Build Status](https://travis-ci.org/subchen/go-log.svg?branch=master)](https://travis-ci.org/subchen/go-log)\n[![Coverage Status](https://coveralls.io/repos/github/subchen/go-log/badge.svg?branch=master)](https://coveralls.io/github/subchen/go-log?branch=master)\n[![Go Report Card](https://goreportcard.com/badge/github.com/subchen/go-log)](https://goreportcard.com/report/github.com/subchen/go-log)\n[![License](http://img.shields.io/badge/License-Apache_2-red.svg?style=flat)](http://www.apache.org/licenses/LICENSE-2.0)\n\nLogging package similar to log4j for the Golang.\n\n- Support dynamic log level\n- Support customized formatter\n  - TextFormatter\n  - JSONFormatter\n- Support multiple rolling file writers\n  - FixedSizeFileWriter\n  - DailyFileWriter\n  - AlwaysNewFileWriter\n\nInstallation\n---------------\n\n```bash\n$ go get github.com/subchen/go-log\n```\n\nUsage\n---------------\n\n```go\npackage main\n\nimport (\n\t\"os\"\n\t\"errors\"\n\t\"github.com/subchen/go-log\"\n)\n\nfunc main() {\n\tlog.Debugf(\"app = %s\", os.Args[0])\n\tlog.Errorf(\"error = %v\", errors.New(\"some error\"))\n\n\t// dynamic set level\n\tlog.Default.Level = log.WARN\n\n\tlog.Debug(\"cannot output debug message\")\n\tlog.Errorln(\"can output error message\", errors.New(\"some error\"))\n}\n```\n\n### Output\n\nDefault log to console, you can set `Logger.Out` to set a file writer into log.\n\n```go\nimport (\n\t\"github.com/subchen/go-log\"\n\t\"github.com/subchen/go-log/writers\"\n)\n\nlog.Default.Out = \u0026writers.FixedSizeFileWriter{\n\tName:\t \"/tmp/test.log\",\n\tMaxSize:  10 * 1024 * 1024, // 10m\n\tMaxCount: 10,\n})\n```\n\nThree builtin writers for use\n\n```go\n// Create log file if file size large than fixed size (10m)\n// files: /tmp/test.log.0 .. test.log.10\n\u0026writers.FixedSizeFileWriter{\n\tName:\t \"/tmp/test.log\",\n\tMaxSize:  10 * 1024 * 1024, // 10m\n\tMaxCount: 10,\n}\n\n// Create log file every day.\n// files: /tmp/test.log.20160102\n\u0026writers.DailyFileWriter{\n\tName: \"/tmp/test.log\",\n\tMaxCount: 10,\n}\n\n// Create log file every process.\n// files: /tmp/test.log.20160102_150405\n\u0026writers.AlwaysNewFileWriter{\n\tName: \"/tmp/test.log\",\n\tMaxCount: 10,\n}\n\n// Output to multiple writes\nio.MultiWriter(\n\tos.Stdout,\n\t\u0026writers.DailyFileWriter{\n\t\tName: \"/tmp/test.log\",\n\t\tMaxCount: 10,\n\t}\n\t//...\n)\n```\n\n### Formatter\n\n```go\nimport (\n\t\"github.com/subchen/go-log\"\n\t\"github.com/subchen/go-log/formatters\"\n)\n\nlog.Default.Formatter = new(formatters.TextFormatter)\n```\n\n\n### New Logger instance\n\n```go\nimport (\n\t\"github.com/subchen/go-log\"\n)\n\nfunc main() {\n\tlogger := \u0026log.Logger{\n\t\tLevel:     log.INFO,\n\t\tFormatter: new(formatters.JSONFormatter),\n\t\tOut:       os.Stdout,\n\t}\n\n\tlogger.Infof(\"i = %d\", 99)\n}\n```\n\n## LICENSE\n\nApache 2.0\n","funding_links":[],"categories":["Logging","日志记录","Logging 日志库","日志","Relational Databases"],"sub_categories":["Advanced Console UIs","Search and Analytic Databases","检索及分析资料库","SQL 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