GodoOS当地代理实现详解
弁言[*]在现代软件开发中，代理服务器饰演着至关告急的角色。它们可以用于负载均衡、请求转发、缓存、安全控制等多种场景。本文将详细介绍 godoos 中的当地代理实现，包括其架构设计、核心功能以及具体的实现细节。
架构设计
核心组件
ProxyServer 结构体：用于存储服务类型和现实服务对象。
FileServer 结构体：用于存储文件静态服务的信息。
sync.Map：用于全局存储代理服务映射，确保线程安全。
主要功能
HTTP 代理：将请求转发到指定的远程服务器。
UDP 代理：实现 UDP 数据包的转发。
文件静态服务：提供静态文件的访问。
核心功能实现
1. 创建当地代理
CreateLocalProxyHandler 函数用于创建一个新的当地代理。它从 HTTP 请求中剖析代理设置，并将其存储到数据库中。然后启动相应的代理服务。
func CreateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
var lp model.LocalProxy
err := json.NewDecoder(r.Body).Decode(&lp)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = model.Db.Create(&lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// 启动代理服务
go startProxy(lp)
libs.SuccessMsg(w, lp, "")
}2. 获取当地代理
GetLocalProxiesHandler 和 GetLocalProxyHandler 函数分别用于获取所有当地代理和单个当地代理的设置信息。
func GetLocalProxiesHandler(w http.ResponseWriter, r *http.Request) {
// 获取查询参数 page 和 limit
pageStr := r.URL.Query().Get("page")
limitStr := r.URL.Query().Get("limit")
page, err := strconv.Atoi(pageStr)
if err != nil || page < 1 {
page = 1
}
limit, err := strconv.Atoi(limitStr)
if err != nil || limit < 1 {
limit = 10
}
// 定义响应结构体
type ProxyResponse struct {
Proxies []model.LocalProxy `json:"proxies"`
Total int64 `json:"total"`
}
// 修改处理函数
proxies, total, err := model.GetLocalProxies(page, limit)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
libs.SuccessMsg(w, ProxyResponse{Proxies: proxies, Total: total}, "")
}UpdateLocalProxyHandler 函数用于更新当地代理的设置。更新后，会制止旧的代理服务并启动新的代理服务。
gofunc UpdateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
var lp model.LocalProxy
err := json.NewDecoder(r.Body).Decode(&lp)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = model.Db.Model(&model.LocalProxy{}).Where("id = ?", lp.ID).Updates(lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// 停止旧的代理服务
stopProxy(lp.ID)
// 启动新的代理服务
go startProxy(lp)
libs.SuccessMsg(w, lp, "")
}DeleteLocalProxyHandler 函数用于删除当地代理。删除前会制止相应的代理服务。
gofunc DeleteLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
// 停止代理服务
stopProxy(uint(id))
err = model.Db.Delete(&model.LocalProxy{}, uint(id)).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
libs.SuccessMsg(w, nil, "delete proxy success")
}HandlerSetProxyStatus 函数用于启用或禁用代理服务。根据代理的状态，启动或制止相应的代理服务。
gofunc HandlerSetProxyStatus(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
if idStr == "" {
libs.ErrorMsg(w, "id is empty")
return
}
id, err := strconv.Atoi(idStr)
if err != nil || id == 0 {
libs.ErrorMsg(w, "id is not number")
return
}
var proxy model.LocalProxy
if err := model.Db.First(&proxy, uint(id)).Error; err != nil {
libs.ErrorMsg(w, "proxy not found")
return
}
if err := model.Db.Model(&model.LocalProxy{}).Where("id = ?", proxy.ID).Update("status", !proxy.Status).Error; err != nil {
libs.ErrorMsg(w, "update proxy status failed")
return
}
if !proxy.Status {
startProxy(proxy)
} else {
stopProxy(proxy.ID)
}
libs.SuccessMsg(w, nil, "")
}启动代理服务
startProxy 函数根据代理的类型启动相应的代理服务。
func startProxy(proxy model.LocalProxy) {
switch proxy.ProxyType {
case "http":
go func(p model.LocalProxy) {
httpProxyHandler(p)
}(proxy)
case "udp":
go func(p model.LocalProxy) {
udpProxyHandler(p)
}(proxy)
case "file":
go func(p model.LocalProxy) {
fileServerHandler(p)
}(proxy)
default:
fmt.Printf("Unknown proxy type: %s\n", proxy.ProxyType)
}
}stopProxy 函数根据代理的类型制止相应的代理服务。
func stopProxy(id uint) {
if server, ok := proxyServers.Load(id); ok {
proxyServer, ok := server.(ProxyServer)
if !ok {
fmt.Printf("Failed to load proxy server for ID %d\n", id)
return
}
switch proxyServer.Type {
case "http":
httpServer, ok := proxyServer.Server.(*http.Server)
if ok {
// 创建一个上下文，用于传递给 server.Shutdown(ctx)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := httpServer.Shutdown(ctx); err != nil {
fmt.Printf("Failed to shutdown HTTP server on port %s: %v\n", httpServer.Addr, err)
} else {
fmt.Printf("Stopped HTTP server on port %s\n", httpServer.Addr)
}
}
case "udp":
udpConn, ok := proxyServer.Server.(*net.UDPConn)
if ok {
udpConn.Close()
fmt.Printf("Stopped UDP server on port %d\n", udpConn.LocalAddr().(*net.UDPAddr).Port)
}
case "file":
fileServer, ok := proxyServer.Server.(*FileServer)
if ok {
// 创建一个上下文，用于传递给 server.Shutdown(ctx)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := fileServer.Server.Shutdown(ctx); err != nil {
fmt.Printf("Failed to shutdown file server on port %d: %v\n", fileServer.Port, err)
} else {
fmt.Printf("Stopped file server on port %d\n", fileServer.Port)
}
}
default:
fmt.Printf("Unknown proxy type: %s\n", proxyServer.Type)
}
proxyServers.Delete(id)
}
}HTTP 代理处理函数
httpProxyHandler 函数用于处理 HTTP 代理请求，将请求转发到指定的远程服务器。
func httpProxyHandler(proxy model.LocalProxy) {
remote, err := url.Parse(proxy.Domain)
if err != nil {
fmt.Printf("Failed to parse remote URL for port %d: %v\n", proxy.Port, err)
return
}
if remote.Scheme == "" {
fmt.Printf("Remote URL for port %d does not contain a scheme (http/https): %s\n", proxy.Port, proxy.Domain)
return
}
reverseProxy := httputil.NewSingleHostReverseProxy(remote)
// 启动 HTTP 服务器并监听指定端口
server := &http.Server{
Addr: fmt.Sprintf(":%d", proxy.Port),
Handler: reverseProxy,
}
proxyServers.Store(proxy.ID, ProxyServer{Type: "http", Server: server})
fmt.Printf("Starting HTTP proxy on port %d and forwarding to %s:%d\n", proxy.Port, proxy.Domain, proxy.Port)
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
fmt.Printf("Failed to start HTTP proxy on port %d: %v\n", proxy.Port, err)
}
}udpProxyHandler 函数用于处理 UDP 代理请求，将数据包转发到指定的远程服务器。
func udpProxyHandler(proxy model.LocalProxy) {
localAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", proxy.Port))
if err != nil {
fmt.Printf("Failed to resolve local UDP address for port %d: %v\n", proxy.Port, err)
return
}
remoteAddr, err := net.ResolveUDPAddr("udp", proxy.Domain)
if err != nil {
fmt.Printf("Failed to resolve remote UDP address for port %d: %v\n", proxy.Port, err)
return
}
conn, err := net.ListenUDP("udp", localAddr)
if err != nil {
fmt.Printf("Failed to listen on UDP port %d: %v\n", proxy.Port, err)
return
}
defer conn.Close()
proxyServers.Store(proxy.ID, ProxyServer{Type: "udp", Server: conn})
buffer := make([]byte, 1024)
for {
n, addr, err := conn.ReadFromUDP(buffer)
if err != nil {
fmt.Printf("Failed to read from UDP: %v\n", err)
continue
}
remoteConn, err := net.DialUDP("udp", nil, remoteAddr)
if err != nil {
fmt.Printf("Failed to dial remote UDP: %v\n", err)
continue
}
_, err = remoteConn.Write(buffer[:n])
if err != nil {
fmt.Printf("Failed to write to remote UDP: %v\n", err)
continue
}
// 读取远程服务器的响应并转发回客户端
n, err = remoteConn.Read(buffer)
if err != nil {
fmt.Printf("Failed to read from remote UDP: %v\n", err)
continue
}
_, err = conn.WriteToUDP(buffer[:n], addr)
if err != nil {
fmt.Printf("Failed to write to client UDP: %v\n", err)
continue
}
}
}fileServerHandler 函数用于提供静态文件的访问。
func fileServerHandler(proxy model.LocalProxy) {
// 创建文件服务器的 HTTP 处理函数
fileHandler := http.FileServer(http.Dir(proxy.Path))
// 启动 HTTP 服务器并监听指定端口
server := &http.Server{
Addr: fmt.Sprintf(":%d", proxy.Port),
Handler: fileHandler,
}
proxyServers.Store(proxy.ID, ProxyServer{Type: "file", Server: &FileServer{Port: int(proxy.Port), Server: server}})
fmt.Printf("Starting file server on port %d serving files from %s\n", proxy.Port, proxy.Path)
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
fmt.Printf("Failed to start file server on port %d: %v\n", proxy.Port, err)
}
}通过本文的介绍，我们详细地了解了 godoos 中当地代理的实现。godoos 通过灵活的代理类型支持 HTTP、UDP 和文件静态服务，并提供了丰富的管理功能，包括创建、更新、删除和设置代理状态。这种设计使得 godoos 可以大概适应各种复杂的网络环境和需求。
盼望本文能资助你更好地理解和利用 godoos 中的当地代理功能。如果你有任何题目或发起，欢迎在评论区留言交流。
全部代码
package proxyimport ( "context" "encoding/json" "fmt" "godo/libs" "godo/model" "net" "net/http" "net/http/httputil" "net/url" "strconv" "sync" "time")// 全局代理服务映射var proxyServers sync.Map// ProxyServer 结构体用于存储服务类型和现实服务对象type ProxyServer struct { Type string Server interface{}}// FileServer 结构体用于存储文件静态服务的信息type FileServer struct { Port int Server *http.Server}// 创建 LocalProxy 的 HTTP 处理函数func CreateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
var lp model.LocalProxy
err := json.NewDecoder(r.Body).Decode(&lp)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = model.Db.Create(&lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// 启动代理服务
go startProxy(lp)
libs.SuccessMsg(w, lp, "")
}// GetLocalProxiesHandler 获取所有 LocalProxy 的 HTTP 处理函数func GetLocalProxiesHandler(w http.ResponseWriter, r *http.Request) { // 获取查询参数 page 和 limit pageStr := r.URL.Query().Get("page") limitStr := r.URL.Query().Get("limit") page, err := strconv.Atoi(pageStr) if err != nil || page < 1 { page = 1 } limit, err := strconv.Atoi(limitStr) if err != nil || limit < 1 { limit = 10 } // 定义相应结构体 type ProxyResponse struct { Proxies []model.LocalProxy `json:"proxies"` Total int64 `json:"total"` } // 修改处理函数 proxies, total, err := model.GetLocalProxies(page, limit) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } libs.SuccessMsg(w, ProxyResponse{Proxies: proxies, Total: total}, "")}// GetLocalProxyHandler 获取单个 LocalProxy 的 HTTP 处理函数func GetLocalProxyHandler(w http.ResponseWriter, r *http.Request) { idStr := r.URL.Query().Get("id") id, err := strconv.Atoi(idStr) if err != nil { http.Error(w, "Invalid ID", http.StatusBadRequest) return } var proxy model.LocalProxy err = model.Db.First(&proxy, uint(id)).Error if err != nil { http.Error(w, err.Error(), http.StatusNotFound) return } libs.SuccessMsg(w, proxy, "")}// UpdateLocalProxyHandler 更新 LocalProxy 的 HTTP 处理函数func UpdateLocalProxyHandler(w http.ResponseWriter, r *http.Request) { var lp model.LocalProxy err := json.NewDecoder(r.Body).Decode(&lp) if err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } err = model.Db.Model(&model.LocalProxy{}).Where("id = ?", lp.ID).Updates(lp).Error if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } // 制止旧的代理服务 stopProxy(lp.ID) // 启动新的代理服务 go startProxy(lp) libs.SuccessMsg(w, lp, "")}// DeleteLocalProxyHandler 删除 LocalProxy 的 HTTP 处理函数func DeleteLocalProxyHandler(w http.ResponseWriter, r *http.Request) { idStr := r.URL.Query().Get("id") id, err := strconv.Atoi(idStr) if err != nil { http.Error(w, "Invalid ID", http.StatusBadRequest) return } // 制止代理服务 stopProxy(uint(id)) err = model.Db.Delete(&model.LocalProxy{}, uint(id)).Error if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } libs.SuccessMsg(w, nil, "delete proxy success")}func HandlerSetProxyStatus(w http.ResponseWriter, r *http.Request) { idStr := r.URL.Query().Get("id") if idStr == "" { libs.ErrorMsg(w, "id is empty") return } id, err := strconv.Atoi(idStr) if err != nil || id == 0 { libs.ErrorMsg(w, "id is not number") return } var proxy model.LocalProxy if err := model.Db.First(&proxy, uint(id)).Error; err != nil { libs.ErrorMsg(w, "proxy not found") return } if err := model.Db.Model(&model.LocalProxy{}).Where("id = ?", proxy.ID).Update("status", !proxy.Status).Error; err != nil { libs.ErrorMsg(w, "update proxy status failed") return } if !proxy.Status { startProxy(proxy) } else { stopProxy(proxy.ID) } libs.SuccessMsg(w, nil, "")}// 初始化代理处理函数func InitProxyHandlers() { go InitFrpcServer() proxies, _, err := model.GetLocalProxies(1, 1000) // 获取所有代理设置 if err != nil { fmt.Println("Failed to get local proxies:", err) return } for _, proxy := range proxies { go startProxy(proxy) }}// 启动代理服务func startProxy(proxy model.LocalProxy) { switch proxy.ProxyType { case "http": go func(p model.LocalProxy) { httpProxyHandler(p) }(proxy) case "udp": go func(p model.LocalProxy) { udpProxyHandler(p) }(proxy) case "file": go func(p model.LocalProxy) { fileServerHandler(p) }(proxy) default: fmt.Printf("Unknown proxy type: %s\n", proxy.ProxyType) }}// 制止代理服务func stopProxy(id uint) { if server, ok := proxyServers.Load(id); ok { proxyServer, ok := server.(ProxyServer) if !ok { fmt.Printf("Failed to load proxy server for ID %d\n", id) return } switch proxyServer.Type { case "http": httpServer, ok := proxyServer.Server.(*http.Server) if ok { // 创建一个上下文，用于通报给 server.Shutdown(ctx) ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() if err := httpServer.Shutdown(ctx); err != nil { fmt.Printf("Failed to shutdown HTTP server on port %s: %v\n", httpServer.Addr, err) } else { fmt.Printf("Stopped HTTP server on port %s\n", httpServer.Addr) } } case "udp": udpConn, ok := proxyServer.Server.(*net.UDPConn) if ok { udpConn.Close() fmt.Printf("Stopped UDP server on port %d\n", udpConn.LocalAddr().(*net.UDPAddr).Port) } case "file": fileServer, ok := proxyServer.Server.(*FileServer) if ok { // 创建一个上下文，用于通报给 server.Shutdown(ctx) ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() if err := fileServer.Server.Shutdown(ctx); err != nil { fmt.Printf("Failed to shutdown file server on port %d: %v\n", fileServer.Port, err) } else { fmt.Printf("Stopped file server on port %d\n", fileServer.Port) } } default: fmt.Printf("Unknown proxy type: %s\n", proxyServer.Type) } proxyServers.Delete(id) }}// HTTP 代理处理函数func httpProxyHandler(proxy model.LocalProxy) { remote, err := url.Parse(proxy.Domain) if err != nil { fmt.Printf("Failed to parse remote URL for port %d: %v\n", proxy.Port, err) return } if remote.Scheme == "" { fmt.Printf("Remote URL for port %d does not contain a scheme (http/https): %s\n", proxy.Port, proxy.Domain) return } reverseProxy := httputil.NewSingleHostReverseProxy(remote) // 设置请求头 // reverseProxy.Director = func(req *http.Request) { // req.Header.Add("X-Forwarded-For", req.RemoteAddr) // req.Header.Add("X-Real-IP", req.RemoteAddr) // req.Host = remote.Host // } // 启动 HTTP 服务器并监听指定端口 server := &http.Server{ Addr: fmt.Sprintf(":%d", proxy.Port), Handler: reverseProxy, } proxyServers.Store(proxy.ID, ProxyServer{Type: "http", Server: server}) fmt.Printf("Starting HTTP proxy on port %d and forwarding to %s:%d\n", proxy.Port, proxy.Domain, proxy.Port) if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed { fmt.Printf("Failed to start HTTP proxy on port %d: %v\n", proxy.Port, err) }}// UDP 代理处理函数func udpProxyHandler(proxy model.LocalProxy) { localAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", proxy.Port)) if err != nil { fmt.Printf("Failed to resolve local UDP address for port %d: %v\n", proxy.Port, err) return } remoteAddr, err := net.ResolveUDPAddr("udp", proxy.Domain) if err != nil { fmt.Printf("Failed to resolve remote UDP address for port %d: %v\n", proxy.Port, err) return } conn, err := net.ListenUDP("udp", localAddr) if err != nil { fmt.Printf("Failed to listen on UDP port %d: %v\n", proxy.Port, err) return } defer conn.Close() proxyServers.Store(proxy.ID, ProxyServer{Type: "udp", Server: conn}) buffer := make([]byte, 1024) for { n, addr, err := conn.ReadFromUDP(buffer) if err != nil { fmt.Printf("Failed to read from UDP: %v\n", err) continue } remoteConn, err := net.DialUDP("udp", nil, remoteAddr) if err != nil { fmt.Printf("Failed to dial remote UDP: %v\n", err) continue } _, err = remoteConn.Write(buffer[:n]) if err != nil { fmt.Printf("Failed to write to remote UDP: %v\n", err) continue } // 读取远程服务器的相应并转发回客户端 n, err = remoteConn.Read(buffer) if err != nil { fmt.Printf("Failed to read from remote UDP: %v\n", err) continue } _, err = conn.WriteToUDP(buffer[:n], addr) if err != nil { fmt.Printf("Failed to write to client UDP: %v\n", err) continue } }}// 文件静态服务处理函数func fileServerHandler(proxy model.LocalProxy) { // 创建文件服务器的 HTTP 处理函数 fileHandler := http.FileServer(http.Dir(proxy.Path)) // 启动 HTTP 服务器并监听指定端口 server := &http.Server{ Addr: fmt.Sprintf(":%d", proxy.Port), Handler: fileHandler, } proxyServers.Store(proxy.ID, ProxyServer{Type: "file", Server: &FileServer{Port: int(proxy.Port), Server: server}}) fmt.Printf("Starting file server on port %d serving files from %s\n", proxy.Port, proxy.Path) if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed { fmt.Printf("Failed to start file server on port %d: %v\n", proxy.Port, err) }}
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