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http_request_reverse_proxy.go
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http_request_reverse_proxy.go
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package nodes
import (
"context"
"errors"
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
"github.com/TeaOSLab/EdgeNode/internal/compressions"
"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
"github.com/TeaOSLab/EdgeNode/internal/utils"
"github.com/TeaOSLab/EdgeNode/internal/utils/fnv"
"github.com/TeaOSLab/EdgeNode/internal/utils/minifiers"
"github.com/iwind/TeaGo/lists"
"github.com/iwind/TeaGo/types"
"io"
"net/http"
"net/url"
"strconv"
"strings"
)
// 处理反向代理
func (this *HTTPRequest) doReverseProxy() {
if this.reverseProxy == nil {
return
}
var retries = 3
var failedOriginIds []int64
var failedLnNodeIds []int64
var failStatusCode int
for i := 0; i < retries; i++ {
originId, lnNodeId, shouldRetry := this.doOriginRequest(failedOriginIds, failedLnNodeIds, i == 0, i == retries-1, &failStatusCode)
if !shouldRetry {
break
}
if originId > 0 {
failedOriginIds = append(failedOriginIds, originId)
}
if lnNodeId > 0 {
failedLnNodeIds = append(failedLnNodeIds, lnNodeId)
}
}
}
// 请求源站
func (this *HTTPRequest) doOriginRequest(failedOriginIds []int64, failedLnNodeIds []int64, isFirstTry bool, isLastRetry bool, failStatusCode *int) (originId int64, lnNodeId int64, shouldRetry bool) {
// 对URL的处理
var stripPrefix = this.reverseProxy.StripPrefix
var requestURI = this.reverseProxy.RequestURI
var requestURIHasVariables = this.reverseProxy.RequestURIHasVariables()
var oldURI = this.uri
var requestHost = ""
if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeCustomized {
requestHost = this.reverseProxy.RequestHost
}
var requestHostHasVariables = this.reverseProxy.RequestHostHasVariables()
// 源站
var requestCall = shared.NewRequestCall()
requestCall.Request = this.RawReq
requestCall.Formatter = this.Format
requestCall.Domain = this.ReqHost
var origin *serverconfigs.OriginConfig
// 二级节点
var hasMultipleLnNodes = false
if this.cacheRef != nil || (this.nodeConfig != nil && this.nodeConfig.GlobalServerConfig != nil && this.nodeConfig.GlobalServerConfig.HTTPAll.ForceLnRequest) {
origin, lnNodeId, hasMultipleLnNodes = this.getLnOrigin(failedLnNodeIds, fnv.HashString(this.URL()))
if origin != nil {
// 强制变更原来访问的域名
requestHost = this.ReqHost
}
if this.cacheRef != nil {
// 回源Header中去除If-None-Match和If-Modified-Since
if !this.cacheRef.EnableIfNoneMatch {
this.DeleteHeader("If-None-Match")
}
if !this.cacheRef.EnableIfModifiedSince {
this.DeleteHeader("If-Modified-Since")
}
}
}
// 自定义源站
if origin == nil {
if !isFirstTry {
origin = this.reverseProxy.AnyOrigin(requestCall, failedOriginIds)
}
if origin == nil {
origin = this.reverseProxy.NextOrigin(requestCall)
if origin != nil && origin.Id > 0 && (*failStatusCode >= 403 && *failStatusCode <= 404) && lists.ContainsInt64(failedOriginIds, origin.Id) {
shouldRetry = false
isLastRetry = true
}
}
requestCall.CallResponseCallbacks(this.writer)
if origin == nil {
err := errors.New(this.URL() + ": no available origin sites for reverse proxy")
remotelogs.ServerError(this.ReqServer.Id, "HTTP_REQUEST_REVERSE_PROXY", err.Error(), "", nil)
this.write50x(err, http.StatusBadGateway, "No origin site yet", "尚未配置源站", true)
return
}
originId = origin.Id
if len(origin.StripPrefix) > 0 {
stripPrefix = origin.StripPrefix
}
if len(origin.RequestURI) > 0 {
requestURI = origin.RequestURI
requestURIHasVariables = origin.RequestURIHasVariables()
}
}
this.origin = origin // 设置全局变量是为了日志等处理
if len(origin.RequestHost) > 0 {
requestHost = origin.RequestHost
requestHostHasVariables = origin.RequestHostHasVariables()
}
// 处理OSS
var isHTTPOrigin = origin.OSS == nil
// 处理Scheme
if isHTTPOrigin && origin.Addr == nil {
err := errors.New(this.URL() + ": Origin '" + strconv.FormatInt(origin.Id, 10) + "' does not has a address")
remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", err.Error())
this.write50x(err, http.StatusBadGateway, "Origin site did not has a valid address", "源站尚未配置地址", true)
return
}
if isHTTPOrigin {
this.RawReq.URL.Scheme = origin.Addr.Protocol.Primary().Scheme()
}
// StripPrefix
if len(stripPrefix) > 0 {
if stripPrefix[0] != '/' {
stripPrefix = "/" + stripPrefix
}
this.uri = strings.TrimPrefix(this.uri, stripPrefix)
if len(this.uri) == 0 || this.uri[0] != '/' {
this.uri = "/" + this.uri
}
}
// RequestURI
if len(requestURI) > 0 {
if requestURIHasVariables {
this.uri = this.Format(requestURI)
} else {
this.uri = requestURI
}
if len(this.uri) == 0 || this.uri[0] != '/' {
this.uri = "/" + this.uri
}
// 处理RequestURI中的问号
var questionMark = strings.LastIndex(this.uri, "?")
if questionMark > 0 {
var path = this.uri[:questionMark]
if strings.Contains(path, "?") {
this.uri = path + "&" + this.uri[questionMark+1:]
}
}
// 去除多个/
this.uri = utils.CleanPath(this.uri)
}
var originAddr = ""
if isHTTPOrigin {
// 获取源站地址
originAddr = origin.Addr.PickAddress()
if origin.Addr.HostHasVariables() {
originAddr = this.Format(originAddr)
}
// 端口跟随
if origin.FollowPort {
var originHostIndex = strings.Index(originAddr, ":")
if originHostIndex < 0 {
var originErr = errors.New(this.URL() + ": Invalid origin address '" + originAddr + "', lacking port")
remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", originErr.Error())
this.write50x(originErr, http.StatusBadGateway, "No port in origin site address", "源站地址中没有配置端口", true)
return
}
originAddr = originAddr[:originHostIndex+1] + types.String(this.requestServerPort())
}
this.originAddr = originAddr
// RequestHost
if len(requestHost) > 0 {
if requestHostHasVariables {
this.RawReq.Host = this.Format(requestHost)
} else {
this.RawReq.Host = requestHost
}
// 是否移除端口
if this.reverseProxy.RequestHostExcludingPort {
this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
}
this.RawReq.URL.Host = this.RawReq.Host
} else if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeOrigin {
// 源站主机名
var hostname = originAddr
if origin.Addr.Protocol.IsHTTPFamily() {
hostname = strings.TrimSuffix(hostname, ":80")
} else if origin.Addr.Protocol.IsHTTPSFamily() {
hostname = strings.TrimSuffix(hostname, ":443")
}
this.RawReq.Host = hostname
// 是否移除端口
if this.reverseProxy.RequestHostExcludingPort {
this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
}
this.RawReq.URL.Host = this.RawReq.Host
} else {
this.RawReq.URL.Host = this.ReqHost
// 是否移除端口
if this.reverseProxy.RequestHostExcludingPort {
this.RawReq.Host = utils.ParseAddrHost(this.RawReq.Host)
this.RawReq.URL.Host = utils.ParseAddrHost(this.RawReq.URL.Host)
}
}
}
// 重组请求URL
var questionMark = strings.Index(this.uri, "?")
if questionMark > -1 {
this.RawReq.URL.Path = this.uri[:questionMark]
this.RawReq.URL.RawQuery = this.uri[questionMark+1:]
} else {
this.RawReq.URL.Path = this.uri
this.RawReq.URL.RawQuery = ""
}
this.RawReq.RequestURI = ""
// 处理Header
this.setForwardHeaders(this.RawReq.Header)
this.processRequestHeaders(this.RawReq.Header)
// 调用回调
this.onRequest()
if this.writer.isFinished {
return
}
// 判断是否为Websocket请求
if isHTTPOrigin && this.RawReq.Header.Get("Upgrade") == "websocket" {
shouldRetry = this.doWebsocket(requestHost, isLastRetry)
return
}
var resp *http.Response
var respBodyIsClosed bool
var requestErr error
var requestErrCode string
if isHTTPOrigin { // 普通HTTP(S)源站
// 修复空User-Agent问题
_, existsUserAgent := this.RawReq.Header["User-Agent"]
if !existsUserAgent {
this.RawReq.Header["User-Agent"] = []string{""}
}
// 获取请求客户端
client, err := SharedHTTPClientPool.Client(this, origin, originAddr, this.reverseProxy.ProxyProtocol, this.reverseProxy.FollowRedirects)
if err != nil {
remotelogs.ErrorServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Create client failed: "+err.Error())
this.write50x(err, http.StatusBadGateway, "Failed to create origin site client", "构造源站客户端失败", true)
return
}
// 尝试自动纠正源站地址中的scheme
if this.RawReq.URL.Scheme == "http" && strings.HasSuffix(originAddr, ":443") {
this.RawReq.URL.Scheme = "https"
} else if this.RawReq.URL.Scheme == "https" && strings.HasSuffix(originAddr, ":80") {
this.RawReq.URL.Scheme = "http"
}
// request origin with Accept-Encoding: gzip, ...
var rawAcceptEncoding string
var acceptEncodingChanged bool
if this.nodeConfig != nil &&
this.nodeConfig.GlobalServerConfig != nil &&
this.nodeConfig.GlobalServerConfig.HTTPAll.RequestOriginsWithEncodings &&
this.RawReq.ProtoAtLeast(1, 1) &&
this.RawReq.Header != nil {
rawAcceptEncoding = this.RawReq.Header.Get("Accept-Encoding")
if len(rawAcceptEncoding) == 0 {
this.RawReq.Header.Set("Accept-Encoding", "gzip")
acceptEncodingChanged = true
} else if strings.Index(rawAcceptEncoding, "gzip") < 0 {
this.RawReq.Header.Set("Accept-Encoding", rawAcceptEncoding+", gzip")
acceptEncodingChanged = true
}
}
// 开始请求
resp, requestErr = client.Do(this.RawReq)
// recover Accept-Encoding
if acceptEncodingChanged {
if len(rawAcceptEncoding) > 0 {
this.RawReq.Header.Set("Accept-Encoding", rawAcceptEncoding)
} else {
this.RawReq.Header.Del("Accept-Encoding")
}
if resp != nil && resp.Header != nil && resp.Header.Get("Content-Encoding") == "gzip" {
bodyReader, gzipErr := compressions.NewGzipReader(resp.Body)
if gzipErr == nil {
resp.Body = bodyReader
}
resp.TransferEncoding = nil
resp.Header.Del("Content-Encoding")
}
}
} else if origin.OSS != nil { // OSS源站
var goNext bool
resp, goNext, requestErrCode, _, requestErr = this.doOSSOrigin(origin)
if requestErr == nil {
if resp == nil || !goNext {
return
}
}
} else {
this.writeCode(http.StatusBadGateway, "The type of origin site has not been supported", "设置的源站类型尚未支持")
return
}
if resp != nil && resp.Body != nil {
defer func() {
if !respBodyIsClosed {
_ = resp.Body.Close()
}
}()
}
if requestErr != nil {
// 客户端取消请求,则不提示
var httpErr *url.Error
var ok = errors.As(requestErr, &httpErr)
if !ok {
if isHTTPOrigin {
SharedOriginStateManager.Fail(origin, requestHost, this.reverseProxy, func() {
this.reverseProxy.ResetScheduling()
})
}
if len(requestErrCode) > 0 {
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)
} else {
this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
}
remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.RawReq.URL.String()+": Request origin server failed: "+requestErr.Error())
} else if !errors.Is(httpErr, context.Canceled) {
if isHTTPOrigin {
SharedOriginStateManager.Fail(origin, requestHost, this.reverseProxy, func() {
this.reverseProxy.ResetScheduling()
})
}
// 是否需要重试
if (originId > 0 || (lnNodeId > 0 && hasMultipleLnNodes)) && !isLastRetry {
shouldRetry = true
this.uri = oldURI // 恢复备份
if httpErr.Err != io.EOF && !errors.Is(httpErr.Err, http.ErrBodyReadAfterClose) {
remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Request origin server failed: "+requestErr.Error())
}
return
}
if httpErr.Timeout() {
this.write50x(requestErr, http.StatusGatewayTimeout, "Read origin site timeout", "源站读取超时", true)
} else if httpErr.Temporary() {
this.write50x(requestErr, http.StatusServiceUnavailable, "Origin site unavailable now", "源站当前不可用", true)
} else {
this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
}
if httpErr.Err != io.EOF && !errors.Is(httpErr.Err, http.ErrBodyReadAfterClose) {
remotelogs.WarnServer("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": Request origin server failed: "+requestErr.Error())
}
} else {
// 是否为客户端方面的错误
var isClientError = false
if errors.Is(httpErr, context.Canceled) {
// 如果是服务器端主动关闭,则无需提示
if this.isConnClosed() {
this.disableLog = true
return
}
isClientError = true
this.addError(errors.New(httpErr.Op + " " + httpErr.URL + ": client closed the connection"))
this.writer.WriteHeader(499) // 仿照nginx
}
if !isClientError {
this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
}
}
return
}
if resp == nil {
this.write50x(requestErr, http.StatusBadGateway, "Failed to read origin site", "源站读取失败", true)
return
}
// fix Content-Type
if resp.Header["Content-Type"] == nil {
resp.Header["Content-Type"] = []string{}
}
// 40x && 50x
*failStatusCode = resp.StatusCode
if ((resp.StatusCode >= 500 && resp.StatusCode < 510 && this.reverseProxy.Retry50X) ||
(resp.StatusCode >= 403 && resp.StatusCode <= 404 && this.reverseProxy.Retry40X)) &&
(originId > 0 || (lnNodeId > 0 && hasMultipleLnNodes)) &&
!isLastRetry {
if resp.Body != nil {
_ = resp.Body.Close()
}
shouldRetry = true
return
}
// 尝试从缓存中恢复
if resp.StatusCode >= 500 && // support 50X only
resp.StatusCode < 510 &&
this.cacheCanTryStale &&
this.web.Cache.Stale != nil &&
this.web.Cache.Stale.IsOn &&
(len(this.web.Cache.Stale.Status) == 0 || lists.ContainsInt(this.web.Cache.Stale.Status, resp.StatusCode)) {
var ok = this.doCacheRead(true)
if ok {
return
}
}
// 记录相关数据
this.originStatus = int32(resp.StatusCode)
// 恢复源站状态
if !origin.IsOk && isHTTPOrigin {
SharedOriginStateManager.Success(origin, func() {
this.reverseProxy.ResetScheduling()
})
}
// WAF对出站进行检查
if this.web.FirewallRef != nil && this.web.FirewallRef.IsOn {
if this.doWAFResponse(resp) {
return
}
}
// 特殊页面
if this.doPage(resp.StatusCode) {
return
}
// Page optimization
if this.web.Optimization != nil && resp.Body != nil && this.cacheRef != nil /** must under cache **/ {
err := minifiers.MinifyResponse(this.web.Optimization, this.URL(), resp)
if err != nil {
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)
return
}
}
// HLS
if this.web.HLS != nil &&
this.web.HLS.Encrypting != nil &&
this.web.HLS.Encrypting.IsOn &&
resp.StatusCode == http.StatusOK {
m3u8Err := this.processM3u8Response(resp)
if m3u8Err != nil {
this.write50x(m3u8Err, http.StatusBadGateway, "m3u8 encrypt: fail to read content from origin", "m3u8加密:从源站读取内容失败", false)
return
}
}
// 设置Charset
// TODO 这里应该可以设置文本类型的列表
if this.web.Charset != nil && this.web.Charset.IsOn && len(this.web.Charset.Charset) > 0 {
contentTypes, ok := resp.Header["Content-Type"]
if ok && len(contentTypes) > 0 {
var contentType = contentTypes[0]
if this.web.Charset.Force {
var semiIndex = strings.Index(contentType, ";")
if semiIndex > 0 {
contentType = contentType[:semiIndex]
}
}
if _, found := textMimeMap[contentType]; found {
var newCharset = this.web.Charset.Charset
if this.web.Charset.IsUpper {
newCharset = strings.ToUpper(newCharset)
}
resp.Header["Content-Type"][0] = contentType + "; charset=" + newCharset
}
}
}
// 替换Location中的源站地址
var locationHeader = resp.Header.Get("Location")
if len(locationHeader) > 0 {
// 空Location处理
if locationHeader == emptyHTTPLocation {
resp.Header.Del("Location")
} else {
// 自动修正Location中的源站地址
locationURL, err := url.Parse(locationHeader)
if err == nil && locationURL.Host != this.ReqHost && (locationURL.Host == originAddr || strings.HasPrefix(originAddr, locationURL.Host+":")) {
locationURL.Host = this.ReqHost
var oldScheme = locationURL.Scheme
// 尝试和当前Scheme一致
if this.IsHTTP {
locationURL.Scheme = "http"
} else if this.IsHTTPS {
locationURL.Scheme = "https"
}
// 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.Bytes)
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.Bytes)
if n > 0 {
_, err = this.writer.Write(buf.Bytes[: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.Bytes)
if n > 0 && !requestIsCanceled {
_, err = this.writer.Write(buf.Bytes[:n])
if err != nil {
requestIsCanceled = true
}
}
if readErr != nil {
err = readErr
break
}
}
} else {
_, err = io.CopyBuffer(this.writer, resp.Body, buf.Bytes)
}
}
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
}