dstpierre / azure-logger

A Go package to pipe log entry to Azure LogFiles/Application

Azure Logger

A simple way to have the standard log being piped to Azure's LogFiles/Application so it can be streamed by the Azure CLI.

Installation

go get github.com/dstpierre/azure-logger

How to use it

package main

import (
    "log"
    logger "github.com/dstpierre/azure-logger"
)

func main() {
    err := logger.Start()
    if err != nil {
        // the log creation file failed 
    }
    defer logger.Stop()
    
    log.Println("This line will be streamed from azure site log tail sitename")
}

By using the standard log package, there's nothing to change if you were already using this. All output from the base logger will be saved into the file, and optionally tail when using Azure's CLI command: azure site log tail sitename.

What it is doing

1. It simply set the output of the log package to be a file in Azure's Application log directory.
2. When it start it will purge every log file older than 24 hours
3. The log file name format are this al_instanceid_date.log

Where instanceid is the 6 first characters of the environment variable WEBSITE_INSTANCE_ID

And date is the current date when the process was started.