A comprehensive guide to commonly used Golang libraries: making your development easier

Comprehensive list of Golang commonly used libraries: Make your development easier

Introduction:
Golang is a rapidly developing programming language and has a strong ecosystem and rich open source libraries. These libraries can not only improve development efficiency, but also reduce code complexity. This article will introduce some commonly used libraries in Golang to facilitate your development work.

1. Network-related libraries

1. net/http: A standard HTTP library used to build web servers and clients. The sample code is as follows:

   package main
   
   import (
    "fmt"
    "log"
    "net/http"
   )
   
   func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, "Hello, World!")
    })
   
    log.Fatal(http.ListenAndServe(":8080", nil))
   }

2. gorilla/mux: A powerful HTTP router and scheduler for building RESTful APIs. The sample code is as follows:

   package main
   
   import (
    "fmt"
    "net/http"
   
    "github.com/gorilla/mux"
   )
   
   func main() {
    router := mux.NewRouter()
   
    router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, "Hello, World!")
    })
   
    http.ListenAndServe(":8080", router)
   }

2. Database-related libraries

1. database/sql: Golang’s database library interface, which can connect to various databases through the driver kind of database. The sample code is as follows:

   package main
   
   import (
    "database/sql"
    "fmt"
   
    _ "github.com/go-sql-driver/mysql"
   )
   
   func main() {
    db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/dbname")
    if err != nil {
        fmt.Println(err)
        return
    }
   
    defer db.Close()
   
    rows, err := db.Query("SELECT * FROM users")
    if err != nil {
        fmt.Println(err)
        return
    }
   
    for rows.Next() {
        var id int
        var name string
        err = rows.Scan(&id, &name)
        if err != nil {
            fmt.Println(err)
            return
        }
   
        fmt.Println(id, name)
    }
   
    err = rows.Err()
    if err != nil {
        fmt.Println(err)
        return
    }
   }

2. go-redis: A Go language Redis client that provides a rich API to operate the Redis database. The sample code is as follows:

   package main
   
   import (
    "fmt"
    "github.com/go-redis/redis"
   )
   
   func main() {
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "",
        DB:       0,
    })
   
    pong, err := client.Ping().Result()
    if err != nil {
        fmt.Println(err)
        return
    }
   
    fmt.Println(pong)
   }

3. Log related library

1. logrus: A powerful logging library that supports multiple output formats and level. The sample code is as follows:

   package main
   
   import (
    "github.com/sirupsen/logrus"
   )
   
   func main() {
    log := logrus.New()
   
    log.SetFormatter(&logrus.JSONFormatter{})
   
    log.WithFields(logrus.Fields{
        "animal": "walrus",
        "size":   10,
    }).Info("A group of walrus emerges from the ocean")
   }

2. zap: A high-performance, structured logging library that can be used as a replacement for logrus. The sample code is as follows:

   package main
   
   import (
    "go.uber.org/zap"
   )
   
   func main() {
    logger, _ := zap.NewProduction()
   
    logger.Info("Info log", zap.String("key", "value"))
    logger.Error("Error log", zap.Error(errors.New("something went wrong")))
   }

4. Concurrency related libraries

1. sync: A package provided by Golang for synchronization operations, such as mutex locks , read-write locks, etc. The sample code is as follows:

   package main
   
   import (
    "fmt"
    "sync"
   )
   
   func main() {
    var wg sync.WaitGroup
    var counter int
    var mutex sync.Mutex
   
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func() {
            mutex.Lock()
            defer mutex.Unlock()
   
            counter++
   
            wg.Done()
        }()
    }
   
    wg.Wait()
    fmt.Println(counter)
   }

2. errgroup: A concurrency tool for error handling and exit mechanisms that can easily manage multiple goroutines. The sample code is as follows:

   package main
   
   import (
    "context"
    "fmt"
    "golang.org/x/sync/errgroup"
   )
   
   func main() {
    g, ctx := errgroup.WithContext(context.Background())
   
    for i := 0; i < 10; i++ {
        i := i
        g.Go(func() error {
            fmt.Println(i)
            return nil
        })
    }
   
    if err := g.Wait(); err != nil {
        fmt.Println(err)
    }
   
    select {
    case <-ctx.Done():
        fmt.Println("Context canceled")
    default:
        fmt.Println("All goroutines finished")
    }
   }

Conclusion:
This article introduces some commonly used libraries in Golang, including network-related libraries, database-related libraries, log-related libraries and concurrency-related libraries. These libraries not only provide rich functionality, but also greatly simplify code development and maintenance. By using these libraries properly, you can make your Golang development easier. Hope this article is helpful to you!

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