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Added custom rewriter for winston-logsene #6

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merged 1 commit into from
May 25, 2016
Merged

Added custom rewriter for winston-logsene #6

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12 changes: 12 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,8 @@ logger.add (logsene, {token: process.env.LOGSENE_TOKEN, type: 'test_logs'})
- __handleExceptions__ - boolean 'true' logs 'uncaught exceptions'
- __exitOnError__ - if set to 'false' process will not exit after logging the 'uncaught exceptions'
- __source__ - name of the logging source, by default name of the main node.js module
- __rewriter__ - similar to rewriters in winston, rewriter allows modifying of __log meta__ but only for the logsene
transport. This is a simple function which takes `level, msg, meta` as parameter and returns the new __meta__ array


### Examples
Expand All @@ -38,6 +40,16 @@ logger.error ("Error message no. %d logged to %s",1,'Logsene', {metadata: "test-
logger.warn ("Warning message no. %d logged to %s",1,'Logsene', {metadata: "test-warning", count:1, tags: ['test', 'warning', 'winston']})
logger.debug ("Debug message no. %d logged to %s",1,'Logsene', {metadata: "test-debug", count:1})

// use custom rewriter
var serverIp = "10.0.0.12";
logger.add (logsene, {
token: process.env.LOGSENE_TOKEN,
rewriter: function (level, msg, meta) {
meta.ip = serverIp;
return meta;
}
})

```

### Schema / Mapping definition for Meta-Data
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4 changes: 4 additions & 0 deletions lib/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ var Logsene = function (options) {
this.timestamp = typeof options.timestamp !== 'undefined' ? options.timestamp : false
this.label = options.label || null
this.source = options.source || (process.mainModule ? null : _dirname(process.mainModule.filename)) || module.filename
this.rewriter = options.rewriter || null
if (this.json) {
this.stringify = options.stringify || function (obj) {
return JSON.stringify(obj, null, 2)
Expand Down Expand Up @@ -62,6 +63,9 @@ Logsene.prototype.log = function (level, msg, meta, callback) {
if (meta && (!meta['source'])) {
meta.source = this.source
}
if (this.rewriter){
meta = this.rewriter(level, msg, meta)
}
var output = common.log({
colorize: this.colorize,
json: this.json,
Expand Down