bunyan(一个用于node.js服务的JSON日志库)

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在实习中，遇到了一个需要将用户登录的信息记录到日志当中，在这次项目中时用的bunyan。

首先贴网址https://github.com/trentm/node-bunyan（npm也是相当有用的）

https://www.npmjs.com/package/bunyan

查看文档可以详细的知道bunyan的api

const logger = bunyan.createLogger({  name: 'website name',  serializers: {    req: bunyan.stdSerializers.req,    res: bunyan.stdSerializers.res,    err: bunyan.stdSerializers.err  },  streams: [    {      // stream: process.stdout      type: 'rotating-file',      level: 'info',      path: path.join(__dirname, '../../../logs', 'info.log'),      period: '1d',   // daily rotation      count: 7        // keep 7 back copies    },    {      type: 'rotating-file',      level: 'debug',      path: path.join(__dirname, '../../../logs', 'server.log'),      period: '1d',   // daily rotation      count: 7        // keep 7 back copies    },    {      type: 'rotating-file',      level: 'error',      path: path.join(__dirname, '../../../logs', 'error.log'),      period: '1d',   // daily rotation      count: 7        // keep 7 back copies    }  ]});

以上是写了三种level的streams，可以设置多个，这个在文档中也可以找到，对应的，使用的时候可以

import logger from '../util/logger';logger.info({    name:'zhangsan',    age:12}, 'logger success');

当然还有logger.error......等等

项目一启动就可以生成对应的日志文件了

bunyan自动添加的字段为"pid", "hostname", "time" 和"v".在这个基础上可以添加自己需要的字段

构造函数api

var bunyan = require('bunyan');

var log = bunyan.createLogger({

name: <string>, // Required

level: <level name or number>, // Optional, see "Levels" section

stream: <node.js stream>, // Optional, see "Streams" section

streams: [<bunyan streams>, ...], // Optional, see "Streams" section

serializers: <serializers mapping>, // Optional, see "Serializers" section

src: <boolean>, // Optional, see "src" section

// Any other fields are added to all log records as is.

foo: 'bar',

...

});

logger.info的api

log.info(); // Returns a boolean: is the "info" level enabled?

// This is equivalent to `log.isInfoEnabled()` or

// `log.isEnabledFor(INFO)` in log4j.

log.info('hi'); // Log a simple string message (or number).

log.info('hi %s', bob, anotherVar); // Uses `util.format` for msg formatting.

log.info({foo: 'bar'}, 'hi');

// The first field can optionally be a "fields" object, which

// is merged into the log record.

log.info(err); // Special case to log an `Error` instance to the record.

// This adds an "err" field with exception details

// (including the stack) and sets "msg" to the exception

// message.

log.info(err, 'more on this: %s', more);

// ... or you can specify the "msg".

log.info({foo: 'bar', err: err}, 'some msg about this error');

// To pass in an Error *and* other fields, use the `err`

// field name for the Error instance.

所有日志等级：log.trace, log.debug, log.info, log.warn, log.error,log.fatal.

剩下的就得去看文档了

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