How to solve the problem of request service degradation and exception handling of concurrent network requests in Go language?

How to solve the problem of request service degradation and exception handling of concurrent network requests in Go language?

With the rapid development of the Internet, more and more applications require concurrent network requests. However, in the case of high concurrency, network requests may cause timeouts, blocking and other problems, thus affecting the stability and reliability of the entire system. Faced with this problem, we can use some technologies provided by the Go language to solve the problem of request service degradation and exception handling of concurrent network requests.

1. Request service downgrade
When the system load reaches a certain threshold, we can downgrade some complex and time-consuming requests by setting request service downgrade rules to ensure the stability of the entire system. In the Go language, we can use sync.WaitGroup and context to implement request service downgrade.

1. Use sync.WaitGroup to wait for all coroutine requests to end

   package main
   
   import (
    "fmt"
    "net/http"
    "sync"
   )
   
   func makeRequest(url string, wg *sync.WaitGroup) {
    defer wg.Done()
   
    resp, err := http.Get(url)
    if err != nil {
        fmt.Printf("请求 [%s] 失败：%s
   ", url, err.Error())
        return
    }
    defer resp.Body.Close()
   
    // 处理响应数据
    // ...
   }
   
   func main() {
    urls := []string{
        "https://www.example.com",
        "https://www.example2.com",
        "https://www.example3.com",
    }
   
    var wg sync.WaitGroup
    wg.Add(len(urls))
   
    for _, url := range urls {
        go makeRequest(url, &wg)
    }
   
    wg.Wait()
   
    fmt.Println("所有请求已完成")
   }

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2. Use context To control the timeout of the request

   package main
   
   import (
    "context"
    "fmt"
    "net/http"
    "time"
   )
   
   func makeRequest(url string, ctx context.Context) {
    req, err := http.NewRequest("GET", url, nil)
    if err != nil {
        fmt.Printf("创建请求 [%s] 失败：%s
   ", url, err.Error())
        return
    }
   
    // 设置请求超时时间为2秒
    ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
    defer cancel()
   
    req = req.WithContext(ctx)
   
    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        fmt.Printf("请求 [%s] 失败：%s
   ", url, err.Error())
        return
    }
    defer resp.Body.Close()
   
    // 处理响应数据
    // ...
   }
   
   func main() {
    urls := []string{
        "https://www.example.com",
        "https://www.example2.com",
        "https://www.example3.com",
    }
   
    ctx := context.Background()
   
    for _, url := range urls {
        go makeRequest(url, ctx)
    }
   
    time.Sleep(5 * time.Second)
   
    fmt.Println("所有请求已超时")
   }

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2. Exception handling
During the request process, the request may fail or be abnormal due to network reasons, server errors, etc. In order to ensure the system For reliability, we need to handle abnormal situations. In Go language, we can use defer and recover to implement exception handling.

1. Use defer and recoverHandle exceptions

   package main
   
   import (
    "fmt"
    "net/http"
   )
   
   func makeRequest(url string) {
    defer func() {
        if r := recover(); r != nil {
            fmt.Printf("请求 [%s] 发生异常：%s
   ", url, r)
        }
    }()
   
    resp, err := http.Get(url)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
   
    // 处理响应数据
    // ...
   }
   
   func main() {
    urls := []string{
        "https://www.example.com",
        "https://www.example2.com",
        "https://www.example3.com",
    }
   
    for _, url := range urls {
        go makeRequest(url)
    }
   
    fmt.Println("所有请求已发送")
   }

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2. Use errgroupLibrary to handle exceptions of multiple requests

   package main
   
   import (
    "fmt"
    "net/http"
   
    "golang.org/x/sync/errgroup"
   )
   
   func makeRequest(url string) error {
    resp, err := http.Get(url)
    if err != nil {
        return err
    }
    defer resp.Body.Close()
   
    // 处理响应数据
    // ...
   
    return nil
   }
   
   func main() {
    urls := []string{
        "https://www.example.com",
        "https://www.example2.com",
        "https://www.example3.com",
    }
   
    var eg errgroup.Group
   
    for _, url := range urls {
        url := url
        eg.Go(func() error {
            return makeRequest(url)
        })
    }
   
    if err := eg.Wait(); err != nil {
        fmt.Printf("发生错误：%s
   ", err.Error())
    } else {
        fmt.Println("所有请求已完成")
    }
   }

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The above are specific code examples to solve the problem of request service degradation and exception handling of concurrent network requests in the Go language. By properly utilizing features such as sync.WaitGroup, context, defer, and recover, we can better control the flow of concurrent network requests. Stability and reliability, providing a better user experience.

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