gor引流测试中间件golang代码添加注释
package main
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import (
"bufio"
"bytes"
"encoding/hex"
"fmt"
"github.com/buger/goreplay/proto"
"os"
)
// requestID -> originalToken
var originalTokens map[string][]byte
// originalToken -> replayedToken
var tokenAliases map[string][]byte
func main() {
originalTokens = make(map[string][]byte)
tokenAliases = make(map[string][]byte)
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
encoded := scanner.Bytes()
buf := make([]byte, len(encoded)/2)
hex.Decode(buf, encoded)
process(buf)
}
}
func process(buf []byte) {
// First byte indicate payload type, possible values:
// 1 - Request
// 2 - Response
// 3 - ReplayedResponse
payloadType := buf[0]
headerSize := bytes.IndexByte(buf, '\n') + 1
header := buf[:headerSize-1]
// Header contains space separated values of: request type, request id, and request start time (or round-trip time for responses)
meta := bytes.Split(header, []byte(" "))
// For each request you should receive 3 payloads (request, response, replayed response) with same request id
reqID := string(meta[1])
payload := buf[headerSize:]
Debug("Received payload:", string(buf))
switch payloadType {
case '1': // Request
if bytes.Equal(proto.Path(payload), []byte("/token")) {
originalTokens[reqID] = []byte{}
Debug("Found token request:", reqID)
} else {
token, vs, _ := proto.PathParam(payload, []byte("token"))//取到生产服务器的token值
if vs != -1 { // If there is GET token param
if alias, ok := tokenAliases[string(token)]; ok { //检查要替换的token值是否存在
// Rewrite original token to alias
payload = proto.SetPathParam(payload, []byte("token"), alias)//将生产的token替换成测服的token
// Copy modified payload to our buffer
buf = append(buf[:headerSize], payload...)
}
}
}
// Emitting data back
os.Stdout.Write(encode(buf))//重写请求准备发往测试服务器
case '2': // Original response
if _, ok := originalTokens[reqID]; ok {
// Token is inside response body
secureToken := proto.Body(payload) //取到生产服务器中返回的token值
originalTokens[reqID] = secureToken
Debug("Remember origial token:", string(secureToken))
}
case '3': // Replayed response
if originalToken, ok := originalTokens[reqID]; ok {
delete(originalTokens, reqID)
secureToken := proto.Body(payload)
tokenAliases[string(originalToken)] = secureToken//拿到测试服务器的token值用来替换掉正服的token值
Debug("Create alias for new token token, was:", string(originalToken), "now:", string(secureToken))
}
}
}
func encode(buf []byte) []byte {
dst := make([]byte, len(buf)*2+1)
hex.Encode(dst, buf)
dst[len(dst)-1] = '\n'
return dst
}
func Debug(args ...interface{}) {
fmt.Fprint(os.Stderr, "[DEBUG][TOKEN-MOD] ")
fmt.Fprintln(os.Stderr, args...)
}
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