mirror of
https://github.com/woodchen-ink/proxy-go.git
synced 2025-07-18 00:21:56 +08:00
238 lines
7.2 KiB
Go
238 lines
7.2 KiB
Go
package handler
|
||
|
||
import (
|
||
"fmt"
|
||
"io"
|
||
"log"
|
||
"net"
|
||
"net/http"
|
||
"net/url"
|
||
"proxy-go/internal/cache"
|
||
"proxy-go/internal/metrics"
|
||
"proxy-go/internal/utils"
|
||
"strings"
|
||
"time"
|
||
|
||
"github.com/woodchen-ink/go-web-utils/iputil"
|
||
"golang.org/x/net/http2"
|
||
)
|
||
|
||
// 镜像代理专用配置常量
|
||
const (
|
||
mirrorMaxIdleConns = 2000 // 镜像代理全局最大空闲连接
|
||
mirrorMaxIdleConnsPerHost = 200 // 镜像代理每个主机最大空闲连接
|
||
mirrorMaxConnsPerHost = 500 // 镜像代理每个主机最大连接数
|
||
mirrorTimeout = 60 * time.Second // 镜像代理超时时间
|
||
)
|
||
|
||
type MirrorProxyHandler struct {
|
||
client *http.Client
|
||
Cache *cache.CacheManager
|
||
}
|
||
|
||
func NewMirrorProxyHandler() *MirrorProxyHandler {
|
||
// 创建优化的拨号器
|
||
dialer := &net.Dialer{
|
||
Timeout: 10 * time.Second,
|
||
KeepAlive: 30 * time.Second,
|
||
}
|
||
|
||
// 创建优化的传输层
|
||
transport := &http.Transport{
|
||
DialContext: dialer.DialContext,
|
||
MaxIdleConns: mirrorMaxIdleConns,
|
||
MaxIdleConnsPerHost: mirrorMaxIdleConnsPerHost,
|
||
MaxConnsPerHost: mirrorMaxConnsPerHost,
|
||
IdleConnTimeout: 90 * time.Second,
|
||
TLSHandshakeTimeout: 5 * time.Second,
|
||
ExpectContinueTimeout: 1 * time.Second,
|
||
DisableKeepAlives: false,
|
||
DisableCompression: false,
|
||
ForceAttemptHTTP2: true,
|
||
WriteBufferSize: 128 * 1024,
|
||
ReadBufferSize: 128 * 1024,
|
||
ResponseHeaderTimeout: 30 * time.Second,
|
||
MaxResponseHeaderBytes: 64 * 1024,
|
||
}
|
||
|
||
// 配置 HTTP/2
|
||
http2Transport, err := http2.ConfigureTransports(transport)
|
||
if err == nil && http2Transport != nil {
|
||
http2Transport.ReadIdleTimeout = 30 * time.Second
|
||
http2Transport.PingTimeout = 10 * time.Second
|
||
http2Transport.AllowHTTP = false
|
||
http2Transport.MaxReadFrameSize = 32 * 1024
|
||
http2Transport.StrictMaxConcurrentStreams = true
|
||
}
|
||
|
||
// 初始化缓存管理器
|
||
cacheManager, err := cache.NewCacheManager("data/mirror_cache")
|
||
if err != nil {
|
||
log.Printf("[Cache] Failed to initialize mirror cache manager: %v", err)
|
||
}
|
||
|
||
return &MirrorProxyHandler{
|
||
client: &http.Client{
|
||
Transport: transport,
|
||
Timeout: mirrorTimeout,
|
||
CheckRedirect: func(req *http.Request, via []*http.Request) error {
|
||
if len(via) >= 10 {
|
||
return fmt.Errorf("stopped after 10 redirects")
|
||
}
|
||
return nil
|
||
},
|
||
},
|
||
Cache: cacheManager,
|
||
}
|
||
}
|
||
|
||
func (h *MirrorProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||
startTime := time.Now()
|
||
collector := metrics.GetCollector()
|
||
collector.BeginRequest()
|
||
defer collector.EndRequest()
|
||
|
||
// 设置 CORS 头
|
||
w.Header().Set("Access-Control-Allow-Origin", "*")
|
||
w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD, PATCH")
|
||
w.Header().Set("Access-Control-Allow-Headers", "*")
|
||
|
||
// 处理 OPTIONS 请求
|
||
if r.Method == "OPTIONS" {
|
||
w.WriteHeader(http.StatusOK)
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | CORS Preflight",
|
||
r.Method, http.StatusOK, time.Since(startTime),
|
||
iputil.GetClientIP(r), "-", r.URL.Path)
|
||
return
|
||
}
|
||
|
||
// 从路径中提取实际URL
|
||
actualURL := strings.TrimPrefix(r.URL.Path, "/mirror/")
|
||
if actualURL == "" || actualURL == r.URL.Path {
|
||
http.Error(w, "Invalid URL", http.StatusBadRequest)
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | Invalid URL",
|
||
r.Method, http.StatusBadRequest, time.Since(startTime),
|
||
iputil.GetClientIP(r), "-", r.URL.Path)
|
||
return
|
||
}
|
||
|
||
if r.URL.RawQuery != "" {
|
||
actualURL += "?" + r.URL.RawQuery
|
||
}
|
||
|
||
// 早期缓存检查 - 只对GET请求进行缓存检查
|
||
if r.Method == http.MethodGet && h.Cache != nil {
|
||
cacheKey := h.Cache.GenerateCacheKey(r)
|
||
if item, hit, notModified := h.Cache.Get(cacheKey, r); hit {
|
||
// 从缓存提供响应
|
||
w.Header().Set("Content-Type", item.ContentType)
|
||
if item.ContentEncoding != "" {
|
||
w.Header().Set("Content-Encoding", item.ContentEncoding)
|
||
}
|
||
w.Header().Set("Proxy-Go-Cache-HIT", "1")
|
||
if notModified {
|
||
w.WriteHeader(http.StatusNotModified)
|
||
return
|
||
}
|
||
http.ServeFile(w, r, item.FilePath)
|
||
collector.RecordRequest(r.URL.Path, http.StatusOK, time.Since(startTime), item.Size, iputil.GetClientIP(r), r)
|
||
return
|
||
}
|
||
}
|
||
|
||
// 解析目标 URL 以获取 host
|
||
parsedURL, err := url.Parse(actualURL)
|
||
if err != nil {
|
||
http.Error(w, "Invalid URL", http.StatusBadRequest)
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | Parse URL error: %v",
|
||
r.Method, http.StatusBadRequest, time.Since(startTime),
|
||
iputil.GetClientIP(r), "-", actualURL, err)
|
||
return
|
||
}
|
||
|
||
// 确保有 scheme
|
||
scheme := parsedURL.Scheme
|
||
if scheme == "" {
|
||
scheme = "https"
|
||
actualURL = "https://" + actualURL
|
||
parsedURL, _ = url.Parse(actualURL)
|
||
}
|
||
|
||
// 创建新的请求
|
||
proxyReq, err := http.NewRequest(r.Method, actualURL, r.Body)
|
||
if err != nil {
|
||
http.Error(w, "Error creating request", http.StatusInternalServerError)
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | Error creating request: %v",
|
||
r.Method, http.StatusInternalServerError, time.Since(startTime),
|
||
iputil.GetClientIP(r), "-", actualURL, err)
|
||
return
|
||
}
|
||
|
||
// 复制原始请求的header
|
||
copyHeader(proxyReq.Header, r.Header)
|
||
|
||
// 设置必要的请求头
|
||
proxyReq.Header.Set("Origin", fmt.Sprintf("%s://%s", scheme, parsedURL.Host))
|
||
proxyReq.Header.Set("Referer", fmt.Sprintf("%s://%s/", scheme, parsedURL.Host))
|
||
if ua := r.Header.Get("User-Agent"); ua != "" {
|
||
proxyReq.Header.Set("User-Agent", ua)
|
||
} else {
|
||
proxyReq.Header.Set("User-Agent", "Mozilla/5.0")
|
||
}
|
||
proxyReq.Header.Set("Host", parsedURL.Host)
|
||
proxyReq.Host = parsedURL.Host
|
||
|
||
// 发送请求
|
||
resp, err := h.client.Do(proxyReq)
|
||
if err != nil {
|
||
http.Error(w, "Error forwarding request", http.StatusBadGateway)
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | Error forwarding request: %v",
|
||
r.Method, http.StatusBadGateway, time.Since(startTime),
|
||
iputil.GetClientIP(r), "-", actualURL, err)
|
||
return
|
||
}
|
||
defer resp.Body.Close()
|
||
|
||
// 复制响应头
|
||
copyHeader(w.Header(), resp.Header)
|
||
w.Header().Set("Proxy-Go-Cache-HIT", "0")
|
||
|
||
// 设置状态码
|
||
w.WriteHeader(resp.StatusCode)
|
||
|
||
var written int64
|
||
// 如果是GET请求且响应成功，使用TeeReader同时写入缓存
|
||
if r.Method == http.MethodGet && resp.StatusCode == http.StatusOK && h.Cache != nil {
|
||
cacheKey := h.Cache.GenerateCacheKey(r)
|
||
if cacheFile, err := h.Cache.CreateTemp(cacheKey, resp); err == nil {
|
||
defer cacheFile.Close()
|
||
teeReader := io.TeeReader(resp.Body, cacheFile)
|
||
written, err = io.Copy(w, teeReader)
|
||
if err == nil {
|
||
h.Cache.Commit(cacheKey, cacheFile.Name(), resp, written)
|
||
}
|
||
} else {
|
||
written, err = io.Copy(w, resp.Body)
|
||
if err != nil && !isConnectionClosed(err) {
|
||
log.Printf("Error writing response: %v", err)
|
||
return
|
||
}
|
||
}
|
||
} else {
|
||
written, err = io.Copy(w, resp.Body)
|
||
if err != nil && !isConnectionClosed(err) {
|
||
log.Printf("Error writing response: %v", err)
|
||
return
|
||
}
|
||
}
|
||
|
||
// 记录访问日志
|
||
log.Printf("| %-6s | %3d | %12s | %15s | %10s | %-30s | %s",
|
||
r.Method, resp.StatusCode, time.Since(startTime),
|
||
iputil.GetClientIP(r), utils.FormatBytes(written),
|
||
utils.GetRequestSource(r), actualURL)
|
||
|
||
// 记录统计信息
|
||
collector.RecordRequest(r.URL.Path, resp.StatusCode, time.Since(startTime), written, iputil.GetClientIP(r), r)
|
||
}
|