Introduction to Gopher-Logger

Gopher-Logger is a lightweight and powerful logging library for the Go programming language, designed to offer flexibility and simplicity. This guide dives deep into its features with a thorough exploration of its APIs, including code snippets to highlight its functionality.

Basic Usage

Gopher-Logger makes it easy to get started with logging in Go. Below is a basic example:

import (
    "github.com/gopher-logger"
)
func main() {
    logger := gopherlogger.New()
    logger.Info("This is an info message")
    logger.Warn("This is a warning message")
    logger.Error("This is an error message")
} 

Custom Formatting

To customize the output format:

logger := gopherlogger.New(
    gopherlogger.WithFormat("{{.Timestamp}} [{{.Level}}] {{.Message}}"),
) 

Log Levels

Gopher-Logger supports different logging levels:

logger.Debug("This is a debug message") logger.Info("This is an info message") logger.Warn("This is a warning message") logger.Error("This is an error message") logger.Fatal("This is a fatal message") 

Output Destinations

Send logs to different destinations:

logger := gopherlogger.New(
    gopherlogger.WithOutput(os.Stdout),   // Console
    gopherlogger.WithOutputFile("app.log") // File
) 

Contextual Logging

Log with additional context to get insightful logs:

requestLogger := logger.WithContext("request_id", "12345") requestLogger.Info("Request received") 

Structured Logging

Log in a structured format for easy parsing:

logger.Info("User logged in", gopherlogger.Field("username", "johndoe")) logger.Warn("Disk space low", gopherlogger.Field("disk_space", "500MB")) 

API Example Application

Below is a comprehensive example incorporating various features of Gopher-Logger:

package main
import (
    "fmt"
    "github.com/gopher-logger"
    "os"
)
func main() {
    logger := gopherlogger.New(
        gopherlogger.WithFormat("{{.Timestamp}} [{{.Level}}] {{.Message}}"),
        gopherlogger.WithOutput(os.Stdout),
        gopherlogger.WithOutputFile("app.log"),
    )

    logger.Info("Application starting")

    requestLogger := logger.WithContext("request_id", "12345")
    requestLogger.Info("Processing request")

    logger.Info("User action", gopherlogger.Field("action", "login"), gopherlogger.Field("username", "johndoe"))

    logger.Warn("Disk space low", gopherlogger.Field("disk_space", "500MB"))
    
    logger.Error("Failed to process request", gopherlogger.Field("error", fmt.Errorf("timeout error")))

    logger.Info("Application shutdown")
} 

By utilizing the functionalities of Gopher-Logger, Go developers can enhance their logging practices, making debugging and monitoring more efficient.

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