mirror of
https://github.com/alibaba/higress.git
synced 2026-02-25 21:21:01 +08:00
306 lines
8.4 KiB
Go
306 lines
8.4 KiB
Go
package util
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import (
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"fmt"
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"math/rand"
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"net/url"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"time"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/alibaba/higress/plugins/wasm-go/extensions/frontend-gray/config"
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"github.com/tidwall/gjson"
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)
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func LogInfof(format string, args ...interface{}) {
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format = fmt.Sprintf("[%s] %s", "frontend-gray", format)
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proxywasm.LogInfof(format, args...)
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}
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func GetXPreHigressVersion(cookies string) (string, string) {
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xPreHigressVersion := ExtractCookieValueByKey(cookies, config.XPreHigressTag)
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preVersions := strings.Split(xPreHigressVersion, ",")
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if len(preVersions) == 0 {
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return "", ""
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}
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if len(preVersions) == 1 {
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return preVersions[0], ""
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}
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return strings.TrimSpace(preVersions[0]), strings.TrimSpace(preVersions[1])
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}
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// 从xff中获取真实的IP
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func GetRealIpFromXff(xff string) string {
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if xff != "" {
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// 通常客户端的真实 IP 是 XFF 头中的第一个 IP
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ips := strings.Split(xff, ",")
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if len(ips) > 0 {
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return strings.TrimSpace(ips[0])
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}
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}
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return ""
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}
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func IsGrayEnabled(grayConfig config.GrayConfig) bool {
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// 检查是否存在重写主机
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if grayConfig.Rewrite != nil && grayConfig.Rewrite.Host != "" {
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return true
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}
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// 检查是否存在灰度版本配置
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return len(grayConfig.GrayDeployments) > 0
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}
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// 是否启用后端的灰度（全链路灰度）
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func IsBackendGrayEnabled(grayConfig config.GrayConfig) bool {
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for _, deployment := range grayConfig.GrayDeployments {
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if deployment.BackendVersion != "" {
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return true
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}
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}
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return false
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}
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// ExtractCookieValueByKey 根据 cookie 和 key 获取 cookie 值
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func ExtractCookieValueByKey(cookie string, key string) string {
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if cookie == "" {
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return ""
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}
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value := ""
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pairs := strings.Split(cookie, ";")
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for _, pair := range pairs {
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pair = strings.TrimSpace(pair)
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kv := strings.Split(pair, "=")
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if kv[0] == key {
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value = kv[1]
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break
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}
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}
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return value
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}
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func ContainsValue(slice []string, value string) bool {
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for _, item := range slice {
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if item == value {
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return true
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}
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}
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return false
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}
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// headers: [][2]string -> map[string][]string
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func ConvertHeaders(hs [][2]string) map[string][]string {
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ret := make(map[string][]string)
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for _, h := range hs {
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k, v := strings.ToLower(h[0]), h[1]
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ret[k] = append(ret[k], v)
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}
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return ret
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}
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// headers: map[string][]string -> [][2]string
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func ReconvertHeaders(hs map[string][]string) [][2]string {
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var ret [][2]string
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for k, vs := range hs {
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for _, v := range vs {
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ret = append(ret, [2]string{k, v})
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}
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}
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sort.SliceStable(ret, func(i, j int) bool {
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return ret[i][0] < ret[j][0]
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})
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return ret
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}
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func GetRule(rules []*config.GrayRule, name string) *config.GrayRule {
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for _, rule := range rules {
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if rule.Name == name {
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return rule
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}
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}
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return nil
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}
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// 检查是否是页面
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var indexSuffixes = []string{
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".html", ".htm", ".jsp", ".php", ".asp", ".aspx", ".erb", ".ejs", ".twig",
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}
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func IsPageRequest(fetchMode string, myPath string) bool {
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if fetchMode == "cors" {
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return false
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}
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ext := path.Ext(myPath)
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return ext == "" || ContainsValue(indexSuffixes, ext)
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}
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// 首页Rewrite
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func IndexRewrite(path, version string, matchRules map[string]string) string {
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for prefix, rewrite := range matchRules {
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if strings.HasPrefix(path, prefix) {
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newPath := strings.Replace(rewrite, "{version}", version, -1)
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return newPath
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}
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}
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return path
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}
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func PrefixFileRewrite(path, version string, matchRules map[string]string) string {
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var matchedPrefix, replacement string
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for prefix, template := range matchRules {
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if strings.HasPrefix(path, prefix) {
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if len(prefix) > len(matchedPrefix) { // 找到更长的前缀
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matchedPrefix = prefix
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replacement = strings.Replace(template, "{version}", version, 1)
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}
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}
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}
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// 将path 中的前缀部分用 replacement 替换掉
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newPath := strings.Replace(path, matchedPrefix, replacement+"/", 1)
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return filepath.Clean(newPath)
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}
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func GetVersion(grayConfig config.GrayConfig, deployment *config.Deployment, xPreHigressVersion string, isPageRequest bool) *config.Deployment {
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if isPageRequest {
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return deployment
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}
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// cookie 中为空，返回当前版本
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if xPreHigressVersion == "" {
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return deployment
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}
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// cookie 中和当前版本不相同，返回cookie中值
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if xPreHigressVersion != deployment.Version {
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deployments := append(grayConfig.GrayDeployments, grayConfig.BaseDeployment)
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for _, curDeployment := range deployments {
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if curDeployment.Version == xPreHigressVersion {
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return curDeployment
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}
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}
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}
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return deployment
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}
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// 从cookie中解析出灰度信息
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func getBySubKey(grayInfoStr string, graySubKey string) string {
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// 首先对 URL 编码的字符串进行解码
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jsonStr, err := url.QueryUnescape(grayInfoStr)
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if err != nil {
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return ""
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}
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// 使用 gjson 从 JSON 字符串中提取 graySubKey 对应的值
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value := gjson.Get(jsonStr, graySubKey)
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// 检查所提取的值是否存在
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if !value.Exists() {
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return ""
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}
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// 返回字符串形式的值
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return value.String()
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}
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func GetGrayKey(grayKeyValueByCookie string, grayKeyValueByHeader string, graySubKey string) string {
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grayKeyValue := grayKeyValueByCookie
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if grayKeyValueByCookie == "" {
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grayKeyValue = grayKeyValueByHeader
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}
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// 如果有子key, 尝试从子key中获取值
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if graySubKey != "" {
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subKeyValue := getBySubKey(grayKeyValue, graySubKey)
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if subKeyValue != "" {
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grayKeyValue = subKeyValue
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}
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}
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return grayKeyValue
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}
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// FilterGrayRule 过滤灰度规则
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func FilterGrayRule(grayConfig *config.GrayConfig, grayKeyValue string) *config.Deployment {
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for _, deployment := range grayConfig.GrayDeployments {
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grayRule := GetRule(grayConfig.Rules, deployment.Name)
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// 首先：先校验用户名单ID
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if grayRule.GrayKeyValue != nil && len(grayRule.GrayKeyValue) > 0 && grayKeyValue != "" {
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if ContainsValue(grayRule.GrayKeyValue, grayKeyValue) {
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return deployment
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}
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}
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// 第二：校验Cookie中的 GrayTagKey
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if grayRule.GrayTagKey != "" && grayRule.GrayTagValue != nil && len(grayRule.GrayTagValue) > 0 {
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cookieStr, _ := proxywasm.GetHttpRequestHeader("cookie")
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grayTagValue := ExtractCookieValueByKey(cookieStr, grayRule.GrayTagKey)
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if ContainsValue(grayRule.GrayTagValue, grayTagValue) {
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return deployment
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}
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}
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}
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return grayConfig.BaseDeployment
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}
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func FilterGrayWeight(grayConfig *config.GrayConfig, preVersion string, preUniqueClientId string, uniqueClientId string) *config.Deployment {
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// 如果没有灰度权重，直接返回基础版本
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if grayConfig.TotalGrayWeight == 0 {
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return grayConfig.BaseDeployment
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}
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deployments := append(grayConfig.GrayDeployments, grayConfig.BaseDeployment)
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LogInfof("preVersion: %s, preUniqueClientId: %s, uniqueClientId: %s", preVersion, preUniqueClientId, uniqueClientId)
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// 用户粘滞，确保每个用户每次访问的都是走同一版本
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if preVersion != "" && uniqueClientId == preUniqueClientId {
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for _, deployment := range deployments {
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if deployment.Version == preVersion {
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return deployment
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}
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}
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}
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totalWeight := 100
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// 如果总权重小于100，则将基础版本也加入到总版本列表中
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if grayConfig.TotalGrayWeight <= totalWeight {
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grayConfig.BaseDeployment.Weight = 100 - grayConfig.TotalGrayWeight
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} else {
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totalWeight = grayConfig.TotalGrayWeight
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}
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rand.Seed(time.Now().UnixNano())
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randWeight := rand.Intn(totalWeight)
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sumWeight := 0
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for _, deployment := range deployments {
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sumWeight += deployment.Weight
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if randWeight < sumWeight {
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return deployment
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}
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}
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return nil
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}
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// InjectContent 用于将内容注入到 HTML 文档的指定位置
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func InjectContent(originalHtml string, injectionConfig *config.Injection) string {
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headInjection := strings.Join(injectionConfig.Head, "\n")
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bodyFirstInjection := strings.Join(injectionConfig.Body.First, "\n")
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bodyLastInjection := strings.Join(injectionConfig.Body.Last, "\n")
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// 使用 strings.Builder 来提高性能
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var sb strings.Builder
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// 预分配内存，避免多次内存分配
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sb.Grow(len(originalHtml) + len(headInjection) + len(bodyFirstInjection) + len(bodyLastInjection))
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sb.WriteString(originalHtml)
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modifiedHtml := sb.String()
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// 注入到头部
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "</head>", headInjection+"\n</head>")
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// 注入到body头
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "<body>", "<body>\n"+bodyFirstInjection)
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// 注入到body尾
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "</body>", bodyLastInjection+"\n</body>")
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return modifiedHtml
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}
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