golang 怎么解析nginx的配置文件

在golang中解析nginx的配置文件可以使用第三方库github.com/mitchellh/mapstructure。这个库提供了将map[string]interface{}转换成struct的功能，可以方便地将nginx配置文件解析成对应的结构体。

以下是一个简单的示例代码：

package main

import (
    "fmt"
    "github.com/mitchellh/mapstructure"
    "io/ioutil"
    "os"
    "strings"
)

type NginxConfig struct {
    Server ServerConfig `mapstructure:"server"`
}

type ServerConfig struct {
    Listen string `mapstructure:"listen"`
    Locations []LocationConfig `mapstructure:"location"`
}

type LocationConfig struct {
    Path string `mapstructure:"path"`
    ProxyPass string `mapstructure:"proxy_pass"`
}

func main() {
    data, err := ioutil.ReadFile("nginx.conf")
    if err != nil {
        fmt.Println("Error reading file:", err)
        os.Exit(1)
    }

    configMap := make(map[string]interface{})
    err = mapstructure.Decode(nginxConfToMap(string(data)), &configMap)
    if err != nil {
        fmt.Println("Error decoding config:", err)
        os.Exit(1)
    }

    var config NginxConfig
    err = mapstructure.Decode(configMap, &config)
    if err != nil {
        fmt.Println("Error decoding config:", err)
        os.Exit(1)
    }

    fmt.Println(config.Server.Listen)
    for _, location := range config.Server.Locations {
        fmt.Println(location.Path, location.ProxyPass)
    }
}

func nginxConfToMap(conf string) map[string]interface{} {
    conf = strings.ReplaceAll(conf, "\n", "")
    conf = strings.ReplaceAll(conf, "\r", "")
    conf = strings.ReplaceAll(conf, "\t", "")
    conf = strings.ReplaceAll(conf, " {", "{")
    conf = strings.ReplaceAll(conf, "{ ", "{")
    conf = strings.ReplaceAll(conf, ";}", "}")
    conf = strings.ReplaceAll(conf, "} ", "}")
    conf = strings.ReplaceAll(conf, ";", "")
    conf = strings.ReplaceAll(conf, "  ", " ")
    conf = strings.ReplaceAll(conf, "  ", " ")
    conf = strings.ReplaceAll(conf, "  ", " ")
    conf = strings.ReplaceAll(conf, "  ", " ")

    result := make(map[string]interface{})
    stack := make([]map[string]interface{}, 0)
    current := result

    for _, line := range strings.Split(conf, "{") {
        line = strings.TrimSpace(line)
        if line == "" {
            continue
        }

        if strings.HasPrefix(line, "}") {
            if len(stack) == 0 {
                continue
            }
            current = stack[len(stack)-1]
            stack = stack[:len(stack)-1]
            continue
        }

        parts := strings.Split(line, " ")
        if len(parts) < 2 {
            continue
        }

        key := parts[0]
        value := strings.Join(parts[1:], " ")

        if strings.HasPrefix(value, "{") {
            newMap := make(map[string]interface{})
            current[key] = newMap
            stack = append(stack, current)
            current = newMap
            continue
        }

        current[key] = value
    }

    return result
}

这个示例代码可以解析以下nginx配置文件：

server {
    listen 80;
    location / {
        proxy_pass http://localhost:8080;
    }
}

输出结果为：

80
/ http://localhost:8080

需要注意的是，本示例代码只能解析一些简单的nginx配置文件。如果你的nginx配置文件比较复杂，可能需要对本示例代码做一些修改或使用更专业的库