logtap

Logtap

Logtap is an embeddable and configurable log aggregation, storage, and publishing service.

Memory Usage

logtap.Drain

A logtap.Drain is a simple endpoint that accepts logs that are sent through logtap. Multiple drains can be created and added to logvac. A drain can represent logs that are streamed to stdout, a file, a tcp socket, or anything that can be wrapped to accept logtap.Message structs. There are 3 adapters stored at logtap/drain.Adapt* that can be used to adapt common interfaces to the logvac.Drain interface.

logtap.Archive

An Archive is an interface for retreiving a slice of logs from the opaque storage medium. Currently there exists one storage option: BoltDB.

Example

This example will create a logtap that accepts udp syslog packets and stores them on disk in two files, fatal.log and info.log. The file fatal.log will only contain fatal errors and higher, while info.log will contain all message that are info and more severe.

package main

import (
  "github.com/nanobox-io/nanobox-logtap"
  "github.com/nanobox-io/nanobox-logtap/drain"
  "github.com/nanobox-io/nanobox-logtap/collector"
  "os"
  "os/signal"
)

func main(){
  logTap := logtap.New(nil)
  defer logTap.Close()
  
  fatal, err := os.Create("/tmp/fatal.log")
  if err != nil {
    panic(err)
  }
  defer fatal.Close()
  info, err := os.Create("/tmp/info.log")
  if err != nil {
    panic(err)
  }
  defer info.Close()

  logTap.AddDrain("info", drain.Filter(drain.AdaptWriter(info)), 1)
  logTap.AddDrain("fatal", drain.Filter(drain.AdaptWriter(fatal)), 5)

  udpCollector, err := collector.SyslogUDPStart("app-logs", ":514" ,logTap)
  if err != nil {
    panic(err)
  }
  defer udpCollector.Close()

  logTap.Publish("logtap", 1, "listening on udp port 514")

  c := make(chan os.Signal, 1)
  signal.Notify(c, os.Interrupt, os.Kill)

  // wait for a signal to arrive
  <-c
}

Notes: