Logger Go Package

Overview

The logger package is a simple Go logging library that provides conditional logging to the console and a log file. It allows you to log messages to the console when no error has occurred and switch to logging to a file once an error is encountered. This can be useful when you want to keep track of errors separately from regular log messages.

Installation

To use this package in your Go project, you can use go get:

go get github.com/wbdb/logger

Usage

Import the logger package into your Go code:

import "github.com/wbdb/logger"

Initialization

To initialize the logger, simply import the package. The logger will be available as logger.Write.

logger.Write = &logger.conditionalLogger{
    consoleLogger: log.New(os.Stdout, "", log.LstdFlags),
}

Logging

The logger provides three main logging methods:

1. Log: This method logs messages either to the console or the log file, based on whether an error has occurred or not.

logger.Write.Log("This is a log message.")

2. Logf: This method logs formatted messages either to the console or the log file.

logger.Write.Logf("Processed %d items.", 10)

3. Error and Errorf: These methods are used to log error messages. When an error is logged, the subsequent logs will be redirected to the log file.

logger.Write.Error("An error occurred.")
logger.Write.Errorf("Error %s: %v", "code", err)

Example

package main

import (
    "github.com/wbdb/logger"
)

func main() {

    // Some regular log messages
    logger.Write.Log("Starting application...")
    logger.Write.Log("Application initialized.")

    // Simulate an error
    logger.Write.Error("Something went wrong!")

    //Errorf
    logger.Write.Errorf("Error read files %s: %v\n", txtPath, err)

    // Error messages and subsequent logs will be written to the log file
    logger.Write.Log("Continuing after the error.")
}