Go language development practice: Set a reasonable limit on the number of requests

In Go language development, setting a reasonable limit on the number of requests is an important and common practice. When writing code related to network requests, we often initiate operations such as HTTP requests to external services or connect to databases, and these operations may cause system resources to be exhausted, thus affecting system performance. To prevent this from happening, we need to limit the number of requests to ensure that the system operates within capacity.

Why it is necessary to set a limit on the number of requests

In actual applications, due to the uncertainty of the time-consuming of network requests and the response speed limit of external services, the system may initiate too many requests at the same time This can lead to performance degradation or even crash. For example, if our system communicates with an external service that requires a long wait for a response, when a large number of users in the system initiate requests at the same time, system resources may be exhausted and requests pile up, ultimately affecting the stability of the system. and availability.

Therefore, it is very necessary to set a limit on the number of requests to effectively control the system load and ensure the normal operation of the system.

How to set the limit on the number of requests

In the Go language, we can implement the request limit by using channel. The following is a sample code that demonstrates how to set an HTTP request limit with a maximum number of concurrent requests of 3:

package main

import (
    "fmt"
    "net/http"
)

func worker(jobs <-chan string, results chan<- string) {
    for job := range jobs {
        resp, err := http.Get(job)
        if err != nil {
            results <- fmt.Sprintf("Error fetching %s: %v", job, err)
        } else {
            results <- fmt.Sprintf("Fetched %s", job)
        }
    }
}

func main() {
    jobs := make(chan string, 5)
    results := make(chan string, 5)

    for i := 0; i < 3; i {
        go worker(jobs, results)
    }

    urls := []string{"https://www.example.com", "https://www.google.com", "https://www.github.com", "https://www. microsoft.com", "https://www.amazon.com"}

    for _, url := range urls {
        jobs <- url
    }

    close(jobs)

    for i := 0; i < len(urls); i {
        fmt.Println(<-results)
    }
}

In this sample code, we define a worker function to perform HTTP requests and create jobs and results Two channel. We set the maximum number of concurrent requests to 3, process the requests in multiple goroutines by sending requests to the jobs channel, and control the number of simultaneous requests to no more than 3. The buffer sizes of jobs and results can also be adjusted according to specific needs to optimize system performance.

Summary

By setting a reasonable limit on the number of requests, we can effectively control the request concurrency caused by the system, avoid the risk of system resources being exhausted, and ensure that the system can still run stably under high load. . In actual development, we can adjust the maximum number of concurrent requests according to specific circumstances to meet the needs and performance requirements of the system. Through the above example code, we can clearly understand how to limit the number of requests in the Go language and improve the robustness and reliability of the system.

Of course, in actual projects, in addition to the limit on the number of requests, other aspects of performance optimization and error handling also need to be considered. These are key points that need to be carefully considered and handled during the development process. We hope that the introduction of this article can help readers better understand how to reasonably set the limit on the number of requests in Go language development and improve the performance and stability of the system.

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