mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-04 15:51:54 +08:00
595 lines
17 KiB
Go
595 lines
17 KiB
Go
package nodes
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import (
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"context"
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"errors"
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"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
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"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
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"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
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"github.com/TeaOSLab/EdgeNode/internal/utils"
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"github.com/TeaOSLab/EdgeNode/internal/utils/fnv"
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"github.com/iwind/TeaGo/lists"
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"github.com/iwind/TeaGo/types"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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)
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// 处理反向代理
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func (this *HTTPRequest) doReverseProxy() {
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if this.reverseProxy == nil {
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return
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}
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var retries = 3
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var failedOriginIds []int64
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var failedLnNodeIds []int64
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var failStatusCode int
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for i := 0; i < retries; i++ {
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originId, lnNodeId, shouldRetry := this.doOriginRequest(failedOriginIds, failedLnNodeIds, i == 0, i == retries-1, &failStatusCode)
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if !shouldRetry {
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break
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}
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if originId > 0 {
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failedOriginIds = append(failedOriginIds, originId)
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}
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if lnNodeId > 0 {
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failedLnNodeIds = append(failedLnNodeIds, lnNodeId)
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}
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}
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}
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// 请求源站
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func (this *HTTPRequest) doOriginRequest(failedOriginIds []int64, failedLnNodeIds []int64, isFirstTry bool, isLastRetry bool, failStatusCode *int) (originId int64, lnNodeId int64, shouldRetry bool) {
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// 对URL的处理
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var stripPrefix = this.reverseProxy.StripPrefix
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var requestURI = this.reverseProxy.RequestURI
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var requestURIHasVariables = this.reverseProxy.RequestURIHasVariables()
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var oldURI = this.uri
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var requestHost = ""
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if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeCustomized {
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requestHost = this.reverseProxy.RequestHost
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}
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var requestHostHasVariables = this.reverseProxy.RequestHostHasVariables()
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// 源站
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var requestCall = shared.NewRequestCall()
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requestCall.Request = this.RawReq
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requestCall.Formatter = this.Format
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requestCall.Domain = this.ReqHost
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var origin *serverconfigs.OriginConfig
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// 二级节点
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var hasMultipleLnNodes = false
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if this.cacheRef != nil || (this.nodeConfig != nil && this.nodeConfig.GlobalServerConfig != nil && this.nodeConfig.GlobalServerConfig.HTTPAll.ForceLnRequest) {
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origin, lnNodeId, hasMultipleLnNodes = this.getLnOrigin(failedLnNodeIds, fnv.HashString(this.URL()))
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if origin != nil {
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// 强制变更原来访问的域名
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requestHost = this.ReqHost
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}
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if this.cacheRef != nil {
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// 回源Header中去除If-None-Match和If-Modified-Since
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if !this.cacheRef.EnableIfNoneMatch {
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this.DeleteHeader("If-None-Match")
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}
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if !this.cacheRef.EnableIfModifiedSince {
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this.DeleteHeader("If-Modified-Since")
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}
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}
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}
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// 自定义源站
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if origin == nil {
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if !isFirstTry {
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origin = this.reverseProxy.AnyOrigin(requestCall, failedOriginIds)
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}
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if origin == nil {
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origin = this.reverseProxy.NextOrigin(requestCall)
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if origin != nil && origin.Id > 0 && (*failStatusCode >= 403 && *failStatusCode <= 404) && lists.ContainsInt64(failedOriginIds, origin.Id) {
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this.writeCode(*failStatusCode, "", "")
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return
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}
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}
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requestCall.CallResponseCallbacks(this.writer)
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if origin == nil {
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err := errors.New(this.URL() + ": no available origin sites for reverse proxy")
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remotelogs.ServerError(this.ReqServer.Id, "HTTP_REQUEST_REVERSE_PROXY", err.Error(), "", nil)
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this.write50x(err, http.StatusBadGateway, "No origin site yet", "尚未配置源站", true)
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return
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}
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originId = origin.Id
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if len(origin.StripPrefix) > 0 {
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stripPrefix = origin.StripPrefix
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}
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if len(origin.RequestURI) > 0 {
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requestURI = origin.RequestURI
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requestURIHasVariables = origin.RequestURIHasVariables()
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}
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}
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this.origin = origin // 设置全局变量是为了日志等处理
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if len(origin.RequestHost) > 0 {
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requestHost = origin.RequestHost
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requestHostHasVariables = origin.RequestHostHasVariables()
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}
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// 处理OSS
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var isHTTPOrigin = origin.OSS == nil
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// 处理Scheme
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if isHTTPOrigin && origin.Addr == nil {
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err := errors.New(this.URL() + ": Origin '" + strconv.FormatInt(origin.Id, 10) + "' does not has a address")
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remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", err.Error())
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this.write50x(err, http.StatusBadGateway, "Origin site did not has a valid address", "源站尚未配置地址", true)
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return
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}
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if isHTTPOrigin {
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this.RawReq.URL.Scheme = origin.Addr.Protocol.Primary().Scheme()
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}
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// StripPrefix
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if len(stripPrefix) > 0 {
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if stripPrefix[0] != '/' {
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stripPrefix = "/" + stripPrefix
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}
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this.uri = strings.TrimPrefix(this.uri, stripPrefix)
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if len(this.uri) == 0 || this.uri[0] != '/' {
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this.uri = "/" + this.uri
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}
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}
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// RequestURI
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if len(requestURI) > 0 {
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if requestURIHasVariables {
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this.uri = this.Format(requestURI)
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} else {
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this.uri = requestURI
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}
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if len(this.uri) == 0 || this.uri[0] != '/' {
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this.uri = "/" + this.uri
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}
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// 处理RequestURI中的问号
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var questionMark = strings.LastIndex(this.uri, "?")
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if questionMark > 0 {
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var path = this.uri[:questionMark]
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if strings.Contains(path, "?") {
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this.uri = path + "&" + this.uri[questionMark+1:]
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}
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}
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// 去除多个/
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this.uri = utils.CleanPath(this.uri)
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}
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var originAddr = ""
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if isHTTPOrigin {
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// 获取源站地址
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originAddr = origin.Addr.PickAddress()
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if origin.Addr.HostHasVariables() {
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originAddr = this.Format(originAddr)
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}
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// 端口跟随
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if origin.FollowPort {
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var originHostIndex = strings.Index(originAddr, ":")
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if originHostIndex < 0 {
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var originErr = errors.New(this.URL() + ": Invalid origin address '" + originAddr + "', lacking port")
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remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", originErr.Error())
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this.write50x(originErr, http.StatusBadGateway, "No port in origin site address", "源站地址中没有配置端口", true)
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return
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}
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originAddr = originAddr[:originHostIndex+1] + types.String(this.requestServerPort())
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}
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this.originAddr = originAddr
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// RequestHost
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if len(requestHost) > 0 {
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if requestHostHasVariables {
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this.RawReq.Host = this.Format(requestHost)
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} else {
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this.RawReq.Host = requestHost
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}
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// 是否移除端口
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if this.reverseProxy.RequestHostExcludingPort {
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this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
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}
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this.RawReq.URL.Host = this.RawReq.Host
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} else if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeOrigin {
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// 源站主机名
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var hostname = originAddr
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if origin.Addr.Protocol.IsHTTPFamily() {
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hostname = strings.TrimSuffix(hostname, ":80")
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} else if origin.Addr.Protocol.IsHTTPSFamily() {
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hostname = strings.TrimSuffix(hostname, ":443")
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}
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this.RawReq.Host = hostname
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// 是否移除端口
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if this.reverseProxy.RequestHostExcludingPort {
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this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
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}
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this.RawReq.URL.Host = this.RawReq.Host
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} else {
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this.RawReq.URL.Host = this.ReqHost
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// 是否移除端口
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if this.reverseProxy.RequestHostExcludingPort {
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this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
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this.RawReq.URL.Host = utils.ParseAddrHost(this.RawReq.URL.Host)
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}
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}
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}
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// 重组请求URL
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var questionMark = strings.Index(this.uri, "?")
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if questionMark > -1 {
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this.RawReq.URL.Path = this.uri[:questionMark]
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this.RawReq.URL.RawQuery = this.uri[questionMark+1:]
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} else {
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this.RawReq.URL.Path = this.uri
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this.RawReq.URL.RawQuery = ""
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}
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this.RawReq.RequestURI = ""
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// 处理Header
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this.setForwardHeaders(this.RawReq.Header)
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this.processRequestHeaders(this.RawReq.Header)
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// 调用回调
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this.onRequest()
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if this.writer.isFinished {
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return
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}
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// 判断是否为Websocket请求
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if isHTTPOrigin && this.RawReq.Header.Get("Upgrade") == "websocket" {
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shouldRetry = this.doWebsocket(requestHost, isLastRetry)
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return
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}
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var resp *http.Response
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var respBodyIsClosed bool
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var requestErr error
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var requestErrCode string
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if isHTTPOrigin { // 普通HTTP(S)源站
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// 修复空User-Agent问题
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_, existsUserAgent := this.RawReq.Header["User-Agent"]
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if !existsUserAgent {
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this.RawReq.Header["User-Agent"] = []string{""}
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}
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// 获取请求客户端
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client, err := SharedHTTPClientPool.Client(this, origin, originAddr, this.reverseProxy.ProxyProtocol, this.reverseProxy.FollowRedirects)
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if err != nil {
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remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Create client failed: "+err.Error())
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this.write50x(err, http.StatusBadGateway, "Failed to create origin site client", "构造源站客户端失败", true)
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return
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}
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// 尝试自动纠正源站地址中的scheme
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if this.RawReq.URL.Scheme == "http" && strings.HasSuffix(originAddr, ":443") {
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this.RawReq.URL.Scheme = "https"
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} else if this.RawReq.URL.Scheme == "https" && strings.HasSuffix(originAddr, ":80") {
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this.RawReq.URL.Scheme = "http"
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}
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// 开始请求
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resp, requestErr = client.Do(this.RawReq)
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} else if origin.OSS != nil { // OSS源站
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var goNext bool
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resp, goNext, requestErrCode, _, requestErr = this.doOSSOrigin(origin)
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if requestErr == nil {
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if resp == nil || !goNext {
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return
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}
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}
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} else {
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this.writeCode(http.StatusBadGateway, "The type of origin site has not been supported", "设置的源站类型尚未支持")
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return
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}
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if resp != nil && resp.Body != nil {
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defer func() {
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if !respBodyIsClosed {
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_ = resp.Body.Close()
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}
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}()
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}
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if requestErr != nil {
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// 客户端取消请求，则不提示
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var httpErr *url.Error
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ok := errors.As(requestErr, &httpErr)
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if !ok {
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if isHTTPOrigin {
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SharedOriginStateManager.Fail(origin, requestHost, this.reverseProxy, func() {
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this.reverseProxy.ResetScheduling()
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})
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}
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if len(requestErrCode) > 0 {
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this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site (error code: "+requestErrCode+")", "源站读取失败（错误代号："+requestErrCode+"）", true)
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} else {
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this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
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}
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remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.RawReq.URL.String()+": Request origin server failed: "+requestErr.Error())
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} else if !errors.Is(httpErr, context.Canceled) {
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if isHTTPOrigin {
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SharedOriginStateManager.Fail(origin, requestHost, this.reverseProxy, func() {
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this.reverseProxy.ResetScheduling()
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})
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}
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// 是否需要重试
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if (originId > 0 || (lnNodeId > 0 && hasMultipleLnNodes)) && !isLastRetry {
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shouldRetry = true
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this.uri = oldURI // 恢复备份
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if httpErr.Err != io.EOF && !errors.Is(httpErr.Err, http.ErrBodyReadAfterClose) {
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remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Request origin server failed: "+requestErr.Error())
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}
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return
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}
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if httpErr.Timeout() {
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this.write50x(requestErr, http.StatusGatewayTimeout, "Read origin site timeout", "源站读取超时", true)
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} else if httpErr.Temporary() {
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this.write50x(requestErr, http.StatusServiceUnavailable, "Origin site unavailable now", "源站当前不可用", true)
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} else {
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this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
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}
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if httpErr.Err != io.EOF && !errors.Is(httpErr.Err, http.ErrBodyReadAfterClose) {
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remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Request origin server failed: "+requestErr.Error())
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}
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} else {
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// 是否为客户端方面的错误
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var isClientError = false
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if ok {
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if errors.Is(httpErr, context.Canceled) {
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// 如果是服务器端主动关闭，则无需提示
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if this.isConnClosed() {
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this.disableLog = true
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return
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}
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isClientError = true
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this.addError(errors.New(httpErr.Op + " " + httpErr.URL + ": client closed the connection"))
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this.writer.WriteHeader(499) // 仿照nginx
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}
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}
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if !isClientError {
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this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
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}
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}
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return
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}
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// 40x && 50x
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*failStatusCode = resp.StatusCode
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if resp != nil &&
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((resp.StatusCode >= 500 && resp.StatusCode < 510 && this.reverseProxy.Retry50X) ||
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(resp.StatusCode >= 403 && resp.StatusCode <= 404 && this.reverseProxy.Retry40X)) &&
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(originId > 0 || (lnNodeId > 0 && hasMultipleLnNodes)) &&
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!isLastRetry {
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if resp.Body != nil {
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_ = resp.Body.Close()
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}
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shouldRetry = true
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return
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}
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// 尝试从缓存中恢复
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if resp != nil &&
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resp.StatusCode >= 500 && // support 50X only
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resp.StatusCode < 510 &&
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this.cacheCanTryStale &&
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this.web.Cache.Stale != nil &&
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this.web.Cache.Stale.IsOn &&
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(len(this.web.Cache.Stale.Status) == 0 || lists.ContainsInt(this.web.Cache.Stale.Status, resp.StatusCode)) {
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var ok = this.doCacheRead(true)
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if ok {
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return
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}
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}
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// 记录相关数据
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this.originStatus = int32(resp.StatusCode)
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// 恢复源站状态
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if !origin.IsOk && isHTTPOrigin {
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SharedOriginStateManager.Success(origin, func() {
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this.reverseProxy.ResetScheduling()
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})
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}
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// WAF对出站进行检查
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if this.web.FirewallRef != nil && this.web.FirewallRef.IsOn {
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if this.doWAFResponse(resp) {
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return
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}
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}
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// 特殊页面
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if this.doPage(resp.StatusCode) {
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return
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}
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// Page optimization
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if this.web.Optimization != nil && resp.Body != nil && this.cacheRef != nil /** must under cache **/ {
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err := this.web.Optimization.FilterResponse(this.URL(), resp)
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if err != nil {
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this.write50x(err, http.StatusBadGateway, "Page Optimization: Fail to read content from origin", "内容优化：从源站读取内容失败", false)
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return
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}
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}
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// 设置Charset
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// TODO 这里应该可以设置文本类型的列表，以及是否强制覆盖所有文本类型的字符集
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if this.web.Charset != nil && this.web.Charset.IsOn && len(this.web.Charset.Charset) > 0 {
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contentTypes, ok := resp.Header["Content-Type"]
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if ok && len(contentTypes) > 0 {
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var contentType = contentTypes[0]
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if _, found := textMimeMap[contentType]; found {
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resp.Header["Content-Type"][0] = contentType + "; charset=" + this.web.Charset.Charset
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}
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}
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}
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// 替换Location中的源站地址
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var locationHeader = resp.Header.Get("Location")
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if len(locationHeader) > 0 {
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// 空Location处理
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if locationHeader == emptyHTTPLocation {
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resp.Header.Del("Location")
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} else {
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// 自动修正Location中的源站地址
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locationURL, err := url.Parse(locationHeader)
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if err == nil && locationURL.Host != this.ReqHost && (locationURL.Host == originAddr || strings.HasPrefix(originAddr, locationURL.Host+":")) {
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locationURL.Host = this.ReqHost
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var oldScheme = locationURL.Scheme
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// 尝试和当前Scheme一致
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if this.IsHTTP {
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locationURL.Scheme = "http"
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} else if this.IsHTTPS {
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locationURL.Scheme = "https"
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}
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|
||
// 如果和当前URL一样，则可能是http -> https，防止无限循环
|
||
if locationURL.String() == this.URL() {
|
||
locationURL.Scheme = oldScheme
|
||
resp.Header.Set("Location", locationURL.String())
|
||
} else {
|
||
resp.Header.Set("Location", locationURL.String())
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 响应Header
|
||
this.writer.AddHeaders(resp.Header)
|
||
this.ProcessResponseHeaders(this.writer.Header(), resp.StatusCode)
|
||
|
||
// 是否需要刷新
|
||
var shouldAutoFlush = this.reverseProxy.AutoFlush || (resp.Header != nil && strings.Contains(resp.Header.Get("Content-Type"), "stream"))
|
||
|
||
// 设置当前连接为Persistence
|
||
if shouldAutoFlush && this.nodeConfig != nil && this.nodeConfig.HasConnTimeoutSettings() {
|
||
var requestConn = this.RawReq.Context().Value(HTTPConnContextKey)
|
||
if requestConn == nil {
|
||
return
|
||
}
|
||
requestClientConn, ok := requestConn.(ClientConnInterface)
|
||
if ok {
|
||
requestClientConn.SetIsPersistent(true)
|
||
}
|
||
}
|
||
|
||
// 准备
|
||
var delayHeaders = this.writer.Prepare(resp, resp.ContentLength, resp.StatusCode, true)
|
||
|
||
// 设置响应代码
|
||
if !delayHeaders {
|
||
this.writer.WriteHeader(resp.StatusCode)
|
||
}
|
||
|
||
// 是否有内容
|
||
if resp.ContentLength == 0 && len(resp.TransferEncoding) == 0 {
|
||
// 即使内容为0，也需要读取一次，以便于触发相关事件
|
||
var buf = utils.BytePool4k.Get()
|
||
_, _ = io.CopyBuffer(this.writer, resp.Body, buf)
|
||
utils.BytePool4k.Put(buf)
|
||
_ = resp.Body.Close()
|
||
respBodyIsClosed = true
|
||
|
||
this.writer.SetOk()
|
||
return
|
||
}
|
||
|
||
// 输出到客户端
|
||
var pool = this.bytePool(resp.ContentLength)
|
||
var buf = pool.Get()
|
||
var err error
|
||
if shouldAutoFlush {
|
||
for {
|
||
n, readErr := resp.Body.Read(buf)
|
||
if n > 0 {
|
||
_, err = this.writer.Write(buf[:n])
|
||
this.writer.Flush()
|
||
if err != nil {
|
||
break
|
||
}
|
||
}
|
||
if readErr != nil {
|
||
err = readErr
|
||
break
|
||
}
|
||
}
|
||
} else {
|
||
if this.cacheRef != nil &&
|
||
this.cacheRef.EnableReadingOriginAsync &&
|
||
resp.ContentLength > 0 &&
|
||
resp.ContentLength < (128<<20) { // TODO configure max content-length in cache policy OR CacheRef
|
||
var requestIsCanceled = false
|
||
for {
|
||
n, readErr := resp.Body.Read(buf)
|
||
|
||
if n > 0 && !requestIsCanceled {
|
||
_, err = this.writer.Write(buf[:n])
|
||
if err != nil {
|
||
requestIsCanceled = true
|
||
}
|
||
}
|
||
if readErr != nil {
|
||
err = readErr
|
||
break
|
||
}
|
||
}
|
||
} else {
|
||
_, err = io.CopyBuffer(this.writer, resp.Body, buf)
|
||
}
|
||
}
|
||
pool.Put(buf)
|
||
|
||
var closeErr = resp.Body.Close()
|
||
respBodyIsClosed = true
|
||
if closeErr != nil {
|
||
if !this.canIgnore(closeErr) {
|
||
remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Closing error: "+closeErr.Error())
|
||
}
|
||
}
|
||
|
||
if err != nil && err != io.EOF {
|
||
if !this.canIgnore(err) {
|
||
remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Writing error: "+err.Error())
|
||
this.addError(err)
|
||
}
|
||
}
|
||
|
||
// 是否成功结束
|
||
if (err == nil || err == io.EOF) && (closeErr == nil || closeErr == io.EOF) {
|
||
this.writer.SetOk()
|
||
}
|
||
|
||
return
|
||
}
|