mirror of
https://github.com/alibaba/higress.git
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263 lines
10 KiB
Go
263 lines
10 KiB
Go
package main
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import (
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"fmt"
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"net/http"
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"path"
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"strings"
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"github.com/alibaba/higress/plugins/wasm-go/extensions/frontend-gray/config"
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"github.com/alibaba/higress/plugins/wasm-go/extensions/frontend-gray/util"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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"github.com/tidwall/gjson"
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)
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func main() {
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wrapper.SetCtx(
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"frontend-gray",
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wrapper.ParseConfigBy(parseConfig),
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wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
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wrapper.ProcessResponseHeadersBy(onHttpResponseHeader),
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wrapper.ProcessResponseBodyBy(onHttpResponseBody),
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)
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}
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func parseConfig(json gjson.Result, grayConfig *config.GrayConfig, log wrapper.Log) error {
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// 解析json 为GrayConfig
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config.JsonToGrayConfig(json, grayConfig)
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log.Debugf("Rewrite: %v, GrayDeployments: %v", json.Get("rewrite"), json.Get("grayDeployments"))
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return nil
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}
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func onHttpRequestHeaders(ctx wrapper.HttpContext, grayConfig config.GrayConfig, log wrapper.Log) types.Action {
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requestPath, _ := proxywasm.GetHttpRequestHeader(":path")
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requestPath = path.Clean(requestPath)
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enabledGray := util.IsGrayEnabled(grayConfig, requestPath)
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ctx.SetContext(config.EnabledGray, enabledGray)
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if !enabledGray {
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ctx.DontReadRequestBody()
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return types.ActionContinue
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}
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cookies, _ := proxywasm.GetHttpRequestHeader("cookie")
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isPageRequest := util.IsPageRequest(requestPath)
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hasRewrite := len(grayConfig.Rewrite.File) > 0 || len(grayConfig.Rewrite.Index) > 0
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grayKeyValueByCookie := util.ExtractCookieValueByKey(cookies, grayConfig.GrayKey)
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grayKeyValueByHeader, _ := proxywasm.GetHttpRequestHeader(grayConfig.GrayKey)
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// 优先从cookie中获取，否则从header中获取
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grayKeyValue := util.GetGrayKey(grayKeyValueByCookie, grayKeyValueByHeader, grayConfig.GraySubKey)
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// 如果有重写的配置，则进行重写
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if hasRewrite {
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// 禁止重新路由，要在更改Header之前操作，否则会失效
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ctx.DisableReroute()
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}
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// 删除Accept-Encoding，避免压缩， 如果是压缩的内容，后续插件就没法处理了
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_ = proxywasm.RemoveHttpRequestHeader("Accept-Encoding")
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_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
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deployment := &config.Deployment{}
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preVersion, preUniqueClientId := util.GetXPreHigressVersion(cookies)
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// 客户端唯一ID，用于在按照比率灰度时候 客户访问黏贴
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uniqueClientId := grayKeyValue
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if uniqueClientId == "" {
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xForwardedFor, _ := proxywasm.GetHttpRequestHeader("X-Forwarded-For")
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uniqueClientId = util.GetRealIpFromXff(xForwardedFor)
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}
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// 如果没有配置比例，则进行灰度规则匹配
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if util.IsSupportMultiVersion(grayConfig) {
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deployment = util.FilterMultiVersionGrayRule(&grayConfig, grayKeyValue, requestPath)
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log.Infof("multi version %v", deployment)
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} else {
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if isPageRequest {
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if grayConfig.TotalGrayWeight > 0 {
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log.Infof("grayConfig.TotalGrayWeight: %v", grayConfig.TotalGrayWeight)
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deployment = util.FilterGrayWeight(&grayConfig, preVersion, preUniqueClientId, uniqueClientId)
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} else {
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deployment = util.FilterGrayRule(&grayConfig, grayKeyValue)
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}
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log.Infof("index deployment: %v, path: %v, backend: %v, xPreHigressVersion: %s,%s", deployment, requestPath, deployment.BackendVersion, preVersion, preUniqueClientId)
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} else {
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grayDeployment := util.FilterGrayRule(&grayConfig, grayKeyValue)
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deployment = util.GetVersion(grayConfig, grayDeployment, preVersion, isPageRequest)
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}
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ctx.SetContext(config.XPreHigressTag, deployment.Version)
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ctx.SetContext(grayConfig.BackendGrayTag, deployment.BackendVersion)
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}
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proxywasm.AddHttpRequestHeader(config.XHigressTag, deployment.Version)
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ctx.SetContext(config.IsPageRequest, isPageRequest)
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ctx.SetContext(config.XUniqueClientId, uniqueClientId)
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rewrite := grayConfig.Rewrite
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if rewrite.Host != "" {
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proxywasm.ReplaceHttpRequestHeader("HOST", rewrite.Host)
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}
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if hasRewrite {
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rewritePath := requestPath
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if isPageRequest {
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rewritePath = util.IndexRewrite(requestPath, deployment.Version, grayConfig.Rewrite.Index)
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} else {
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rewritePath = util.PrefixFileRewrite(requestPath, deployment.Version, grayConfig.Rewrite.File)
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}
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if requestPath != rewritePath {
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log.Infof("rewrite path:%s, rewritePath:%s, Version:%v", requestPath, rewritePath, deployment.Version)
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proxywasm.ReplaceHttpRequestHeader(":path", rewritePath)
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}
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}
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return types.ActionContinue
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}
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func onHttpResponseHeader(ctx wrapper.HttpContext, grayConfig config.GrayConfig, log wrapper.Log) types.Action {
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enabledGray, _ := ctx.GetContext(config.EnabledGray).(bool)
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if !enabledGray {
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ctx.DontReadResponseBody()
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return types.ActionContinue
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}
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isPageRequest, ok := ctx.GetContext(config.IsPageRequest).(bool)
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if !ok {
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isPageRequest = false // 默认值
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}
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// response 不处理非首页的请求
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if !isPageRequest {
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ctx.DontReadResponseBody()
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return types.ActionContinue
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} else {
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// 不会进去Streaming 的Body处理
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ctx.BufferResponseBody()
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}
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status, err := proxywasm.GetHttpResponseHeader(":status")
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if grayConfig.Rewrite != nil && grayConfig.Rewrite.Host != "" {
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// 删除Content-Disposition，避免自动下载文件
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proxywasm.RemoveHttpResponseHeader("Content-Disposition")
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}
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// 删除content-length，可能要修改Response返回值
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proxywasm.RemoveHttpResponseHeader("Content-Length")
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// 处理code为 200的情况
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if err != nil || status != "200" {
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if status == "404" {
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if grayConfig.Rewrite.NotFound != "" && isPageRequest {
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ctx.SetContext(config.IsNotFound, true)
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responseHeaders, _ := proxywasm.GetHttpResponseHeaders()
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headersMap := util.ConvertHeaders(responseHeaders)
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if _, ok := headersMap[":status"]; !ok {
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headersMap[":status"] = []string{"200"} // 如果没有初始化，设定默认值
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} else {
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headersMap[":status"][0] = "200" // 修改现有值
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}
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if _, ok := headersMap["content-type"]; !ok {
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headersMap["content-type"] = []string{"text/html"} // 如果没有初始化，设定默认值
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} else {
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headersMap["content-type"][0] = "text/html" // 修改现有值
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}
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// 删除 content-length 键
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delete(headersMap, "content-length")
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proxywasm.ReplaceHttpResponseHeaders(util.ReconvertHeaders(headersMap))
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ctx.BufferResponseBody()
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return types.ActionContinue
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} else {
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// 直接返回400
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ctx.DontReadResponseBody()
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}
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}
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log.Errorf("error status: %s, error message: %v", status, err)
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return types.ActionContinue
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}
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cacheControl, _ := proxywasm.GetHttpResponseHeader("cache-control")
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if !strings.Contains(cacheControl, "no-cache") {
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proxywasm.ReplaceHttpResponseHeader("cache-control", "no-cache, no-store, max-age=0, must-revalidate")
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}
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frontendVersion, isFeVersionOk := ctx.GetContext(config.XPreHigressTag).(string)
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xUniqueClient, isUniqClientOk := ctx.GetContext(config.XUniqueClientId).(string)
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// 设置前端的版本
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if isFeVersionOk && isUniqClientOk && frontendVersion != "" {
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proxywasm.AddHttpResponseHeader("Set-Cookie", fmt.Sprintf("%s=%s,%s; Max-Age=%s; Path=/;", config.XPreHigressTag, frontendVersion, xUniqueClient, grayConfig.UserStickyMaxAge))
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}
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// 设置后端的版本
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if util.IsBackendGrayEnabled(grayConfig) {
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backendVersion, isBackVersionOk := ctx.GetContext(grayConfig.BackendGrayTag).(string)
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if isBackVersionOk && backendVersion != "" {
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proxywasm.AddHttpResponseHeader("Set-Cookie", fmt.Sprintf("%s=%s; Max-Age=%s; Path=/;", grayConfig.BackendGrayTag, backendVersion, grayConfig.UserStickyMaxAge))
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}
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}
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return types.ActionContinue
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}
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func onHttpResponseBody(ctx wrapper.HttpContext, grayConfig config.GrayConfig, body []byte, log wrapper.Log) types.Action {
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enabledGray, _ := ctx.GetContext(config.EnabledGray).(bool)
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if !enabledGray {
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return types.ActionContinue
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}
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isPageRequest, isPageRequestOk := ctx.GetContext(config.IsPageRequest).(bool)
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frontendVersion, isFeVersionOk := ctx.GetContext(config.XPreHigressTag).(string)
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// 只处理首页相关请求
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if !isFeVersionOk || !isPageRequestOk || !isPageRequest {
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return types.ActionContinue
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}
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isNotFound, ok := ctx.GetContext(config.IsNotFound).(bool)
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if !ok {
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isNotFound = false // 默认值
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}
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// 检查是否存在自定义 HTML， 如有则省略 rewrite.indexRouting 的内容
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if grayConfig.Html != "" {
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log.Debugf("Returning custom HTML from config.")
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// 替换响应体为 config.Html 内容
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if err := proxywasm.ReplaceHttpResponseBody([]byte(grayConfig.Html)); err != nil {
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log.Errorf("Error replacing response body: %v", err)
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return types.ActionContinue
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}
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newHtml := util.InjectContent(grayConfig.Html, grayConfig.Injection)
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// 替换当前html加载的动态文件版本
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newHtml = strings.ReplaceAll(newHtml, "{version}", frontendVersion)
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// 最终替换响应体
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if err := proxywasm.ReplaceHttpResponseBody([]byte(newHtml)); err != nil {
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log.Errorf("Error replacing injected response body: %v", err)
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return types.ActionContinue
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}
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return types.ActionContinue
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}
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// 针对404页面处理
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if isNotFound && grayConfig.Rewrite.Host != "" && grayConfig.Rewrite.NotFound != "" {
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client := wrapper.NewClusterClient(wrapper.RouteCluster{Host: grayConfig.Rewrite.Host})
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client.Get(strings.Replace(grayConfig.Rewrite.NotFound, "{version}", frontendVersion, -1), nil, func(statusCode int, responseHeaders http.Header, responseBody []byte) {
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proxywasm.ReplaceHttpResponseBody(responseBody)
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proxywasm.ResumeHttpResponse()
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}, 1500)
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return types.ActionPause
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}
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// 处理响应体HTML
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newBody := string(body)
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newBody = util.InjectContent(newBody, grayConfig.Injection)
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if grayConfig.LocalStorageGrayKey != "" {
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localStr := strings.ReplaceAll(`<script>
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!function(){var o,e,n="@@X_GRAY_KEY",t=document.cookie.split("; ").filter(function(o){return 0===o.indexOf(n+"=")});try{"undefined"!=typeof localStorage&&null!==localStorage&&(o=localStorage.getItem(n),e=0<t.length?decodeURIComponent(t[0].split("=")[1]):null,o)&&o.indexOf("=")<0&&e&&e!==o&&(document.cookie=n+"="+encodeURIComponent(o)+"; path=/;",window.location.reload())}catch(o){}}();
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</script>
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`, "@@X_GRAY_KEY", grayConfig.LocalStorageGrayKey)
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newBody = strings.ReplaceAll(newBody, "<body>", "<body>\n"+localStr)
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}
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if err := proxywasm.ReplaceHttpResponseBody([]byte(newBody)); err != nil {
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return types.ActionContinue
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}
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return types.ActionContinue
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}
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