This is a transport module for the winston logger winstonjs/winston for logging with Logsene by Sematext.

Winston-Logsene combines the flexibility of using the Winston logging framework with Logsene (think Hosted Elasticsearch + Kibana). Create your free account and access token here.

Usage

var winston = require('winston')
var logsene = require('winston-logsene') 
var logger = new winston.Logger()
logger.add (logsene, {
  token: process.env.LOGSENE_TOKEN, 
  type: 'test_logs', 
  url: 'https://logsene-receiver.sematext.com/_bulk'
})

Options

• token - Create your free account and access token here.
• type - Type of your logs - please note you can define Elasticsearch mapping templates in Logsene
• url - Logsene receiver URL (e.g. for Logsene On Premises), defaults to Sematext Cloud (US) receiver https://logsene-receiver.sematext.com/_bulk. To ship logs to Sematext Cloud (EU) in Europe use https://logsene-receiver.eu.sematext.com/_bulk
• 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
• setSource - "true" adds "source" to the log event (modifies the object!), default false
• 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
• flushOnExit - Handling SIGTERM, SIGQUIT, SIGINT and 'beforeExit' to flush logs and terminate. Default value: true.

Examples

// use dynamic list of placeholders and parameters and any Object as Metadata
// message placeholders work the same way as in util.format()
logger.info ('Info Message')
// utilize tags (in the metadata object) as filter to be used in Logsene UI
logger.info ('Info Message', {tags: ['info', 'test']})
logger.info ("Info message no. %d logged to %s",1,'Logsene', {metadata: "test-log", count:1 , tags: ['test', 'info', 'winston']})
logger.error ("Error message no. %d logged to %s",1,'Logsene', {metadata: "test-error", count:1, tags: ['test', 'error', 'winston']})
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

It is possible to log any JSON Object as meta data, but please note Logsene stores data in Elasticsearch and therefore you should define an index template, matching your data structure. More about Elasticsearch mapping and templates for Logsene: http://blog.sematext.com/2015/01/20/custom-elasticsearch-index-templates-in-logsene/

In addition you should use different types for different meta data structures to avoid type conflicts in Elasticsearch. Include a type name in the meta-data like {type: 'logType1', ...} - this overwrites the "type" property, specified in the contstructor.

logger.add (logsene, {token: process.env.LOGSENE_TOKEN, type: 'my_logs'})
// numeric id, log type from constructor
logger.info('hello', {id: 1})
// The next line will cause a type conflict in Elasticsearch/Logsene, because id was a number before
logger.info('hello', {id: 'ID-1'}) 
// using a different type, OK no type conflict for the field 'id' in Elasticsearch/Logsene
// because we use a different type in the Elasticsearch/Logsene index 
logger.info('hello', {type: 'my_type_with_string_ids',{id: 'ID-1'})

Security

• HTTPS is enabled by default
• Environment variables for Proxy servers:
  • For HTTPS endpoints (default): HTTPS_PROXY / https_proxy

        export HTTPS_PROXY=https://my-ssl-proxy.example
        export HTTPS_PROXY=http://my-proxy.example

• For HTTP endpoints (e.g. On-Premises): HTTP_PROXY / http_proxy

        export HTTP_PROXY=http://my-proxy.example
        export HTTP_PROXY=https://my-ssl-proxy.example

License

Apache 2, see LICENSE file