func main() { p, err := plugin.Open("plugin.so") if err != nil { log.Fatal(err) } examplePlugin, err := p.Lookup("GetProductBasePrice") if err != nil { log.Fatal(err) } count := int64(0) for { examplePlugin.(func(int) int)(100) count ++ } } 增加每秒打印count

你可以在代码中添加一个定时器，每秒钟打印一次 count 的值。可以使用 time 包中的 NewTicker 函数来实现这个功能。下面是修改后的代码示例：

func main() {
    p, err := plugin.Open("plugin.so")
    if err != nil {
        log.Fatal(err)
    }

    examplePlugin, err := p.Lookup("GetProductBasePrice")
    if err != nil {
        log.Fatal(err)
    }

    count := int64(0)

    ticker := time.NewTicker(time.Second)
    defer ticker.Stop()

    for {
        examplePlugin.(func(int) int)(100)
        count++
        select {
        case <-ticker.C:
            fmt.Printf("count: %d\n", count)
        default:
        }
    }
}

这样就可以在每秒钟打印一次 count 的值了。

相关问题

package main import ( "fmt" "log" "net/http" ) func handler(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello, world!") } func main() { mux := http.NewServeMux() mux.HandleFunc("/", handler) go func() { err := http.ListenAndServe(":8080", mux) if err != nil { log.Fatal(err) } }() go func() { err := http.ListenAndServe(":8081", mux) if err != nil { log.Fatal(err) } }() select {} }怎么用一个http请求结束这段代码

你可以使用 context 包来实现这个目的。具体实现可以参考以下代码：

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello, world!")
}

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", handler)

	srv := &http.Server{Addr: ":8080", Handler: mux}

	go func() {
		if err := srv.ListenAndServe(); err != http.ErrServerClosed {
			log.Fatalf("ListenAndServe(): %v", err)
		}
	}()

	ctx := context.Background()

	// 等待一个 http 请求
	<-ctx.Done()

	// 关闭服务器
	if err := srv.Shutdown(context.Background()); err != nil {
		log.Fatalf("Shutdown(): %v", err)
	}
}

这个程序会启动一个 HTTP 服务器，监听 8080 端口。当程序收到一个 http 请求时，会关闭服务器并退出程序。

帮我规整以下代码：package main import ( "fmt" "log" "os" "os/exec" "strings" ) const ( apacheConfPath = "/usr/local/lighthouse/softwares/apache/conf/httpd.conf" // 修改Apache配置文件路径 localPort = "8080" ) func main() { // 修改Apache配置文件中的端口号 err := updateApacheConfig() if err != nil { log.Fatalf("Failed to update Apache configuration: %s", err) } // 重新加载Apache配置 err = reloadApache() if err != nil { log.Fatalf("Failed to reload Apache: %s", err) } // 配置防火墙规则 err = configureFirewall() if err != nil { log.Fatalf("Failed to configure firewall: %s", err) } fmt.Printf("Apache端口已修改为本地可见的端口 %s\n", localPort) } func updateApacheConfig() error { // 打开Apache配置文件 apacheConfFile, err := os.OpenFile(apacheConfPath, os.O_RDWR, 0644) if err != nil { return fmt.Errorf("failed to open Apache configuration file: %w", err) } defer apacheConfFile.Close() // 读取Apache配置文件内容 apacheConfBytes, err := os.ReadFile(apacheConfPath) if err != nil { return fmt.Errorf("failed to read Apache configuration file: %w", err) } // 替换端口号 newConfContent := strings.ReplaceAll(string(apacheConfBytes), "Listen 80", "Listen "+localPort) // 回到文件开头 _, err = apacheConfFile.Seek(0, 0) if err != nil { return fmt.Errorf("failed to seek to the beginning of Apache configuration file: %w", err) } // 清空文件内容 err = apacheConfFile.Truncate(0) if err != nil { return fmt.Errorf("failed to truncate Apache configuration file: %w", err) } // 写入新的配置内容 _, err = apacheConfFile.WriteString(newConfContent) if err != nil { return fmt.Errorf("failed to write updated Apache configuration: %w", err) } return nil } func reloadApache() error { cmd := exec.Command("systemctl", "restart", "httpd") // 使用systemctl命令重新启动Apache err := cmd.Run() if err != nil { return fmt.Errorf("failed to reload Apache: %w", err) } return nil } func configureFirewall() error { // 添加防火墙规则允许从本地访问新端口 allowCmd := exec.Command("iptables", "-A", "INPUT", "-p", "tcp", "--dport", localPort, "-j", "ACCEPT") err := allowCmd.Run() if err != nil { return fmt.Errorf("failed to configure firewall to allow local access: %w", err) } // 阻止从外部访问新端口 dropCmd := exec.Command("iptables", "-A", "INPUT", "-p", "tcp", "--dport", localPort, "-j", "DROP") err = dropCmd.Run() if err != nil { return fmt.Errorf("failed to configure firewall to block external access: %w", err) } // 保存防火墙规则 saveCmd := exec.Command("bash", "-c", "iptables-save > /etc/sysconfig/iptables") err = saveCmd.Run() if err != nil { return fmt.Errorf("failed to save firewall rules: %w", err) } return nil }

以下是规整后的代码：

package main

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"strings"
)

const (
	apacheConfPath = "/usr/local/lighthouse/softwares/apache/conf/httpd.conf" // 修改Apache配置文件路径
	localPort      = "8080"
)

func main() {
	// 修改Apache配置文件中的端口号
	err := updateApacheConfig()
	if err != nil {
		log.Fatalf("Failed to update Apache configuration: %s", err)
	}

	// 重新加载Apache配置
	err = reloadApache()
	if err != nil {
		log.Fatalf("Failed to reload Apache: %s", err)
	}

	// 配置防火墙规则
	err = configureFirewall()
	if err != nil {
		log.Fatalf("Failed to configure firewall: %s", err)
	}
	fmt.Printf("Apache端口已修改为本地可见的端口 %s\n", localPort)
}

func updateApacheConfig() error {
	// 打开Apache配置文件
	apacheConfFile, err := os.OpenFile(apacheConfPath, os.O_RDWR, 0644)
	if err != nil {
		return fmt.Errorf("failed to open Apache configuration file: %w", err)
	}
	defer apacheConfFile.Close()

	// 读取Apache配置文件内容
	apacheConfBytes, err := os.ReadFile(apacheConfPath)
	if err != nil {
		return fmt.Errorf("failed to read Apache configuration file: %w", err)
	}

	// 替换端口号
	newConfContent := strings.ReplaceAll(string(apacheConfBytes), "Listen 80", "Listen "+localPort)

	// 回到文件开头
	_, err = apacheConfFile.Seek(0, 0)
	if err != nil {
		return fmt.Errorf("failed to seek to the beginning of Apache configuration file: %w", err)
	}

	// 清空文件内容
	err = apacheConfFile.Truncate(0)
	if err != nil {
		return fmt.Errorf("failed to truncate Apache configuration file: %w", err)
	}
	// 写入新的配置内容
	_, err = apacheConfFile.WriteString(newConfContent)
	if err != nil {
		return fmt.Errorf("failed to write updated Apache configuration: %w", err)
	}

	return nil
}

func reloadApache() error {
	cmd := exec.Command("systemctl", "restart", "httpd") // 使用systemctl命令重新启动Apache
	err := cmd.Run()
	if err != nil {
		return fmt.Errorf("failed to reload Apache: %w", err)
	}
	return nil
}

func configureFirewall() error {
	// 添加防火墙规则允许从本地访问新端口
	allowCmd := exec.Command("iptables", "-A", "INPUT", "-p", "tcp", "--dport", localPort, "-j", "ACCEPT")
	err := allowCmd.Run()
	if err != nil {
		return fmt.Errorf("failed to configure firewall to allow local access: %w", err)
	}

	// 阻止从外部访问新端口
	dropCmd := exec.Command("iptables", "-A", "INPUT", "-p", "tcp", "--dport", localPort, "-j", "DROP")
	err = dropCmd.Run()
	if err != nil {
		return fmt.Errorf("failed to configure firewall to block external access: %w", err)
	}

	// 保存防火墙规则
	saveCmd := exec.Command("bash", "-c", "iptables-save > /etc/sysconfig/iptables")
	err = saveCmd.Run()
	if err != nil {
		return fmt.Errorf("failed to save firewall rules: %w", err)
	}

	return nil
}

希望可以帮到你！如果还有其他问题，请随时提问。