remove dependency for ai-statistic (alibaba#1660)

plugins/wasm-go/extensions/ai-quota/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -215,35 +216,51 @@ func onHttpStreamingResponseBody(ctx wrapper.HttpContext, config QuotaConfig, da
 	if chatMode == ChatModeNone || chatMode == ChatModeAdmin {
 		return data
 	}
+	var inputToken, outputToken int64
+	var consumer string
+	if inputToken, outputToken, ok := getUsage(data); ok {
+		ctx.SetContext("input_token", inputToken)
+		ctx.SetContext("output_token", outputToken)
+	}
+
 	// chat completion mode
 	if !endOfStream {
 		return data
 	}
-	inputTokenStr, err := proxywasm.GetProperty([]string{"filter_state", "wasm.input_token"})
-	if err != nil {
-		return data
-	}
-	outputTokenStr, err := proxywasm.GetProperty([]string{"filter_state", "wasm.output_token"})
-	if err != nil {
-		return data
-	}
-	inputToken, err := strconv.Atoi(string(inputTokenStr))
-	if err != nil {
-		return data
-	}
-	outputToken, err := strconv.Atoi(string(outputTokenStr))
-	if err != nil {
+
+	if ctx.GetContext("input_token") == nil || ctx.GetContext("output_token") == nil || ctx.GetContext("consumer") == nil {
 		return data
 	}
-	consumer, ok := ctx.GetContext("consumer").(string)
-	if ok {
-		totalToken := int(inputToken + outputToken)
-		log.Debugf("update consumer:%s, totalToken:%d", consumer, totalToken)
-		config.redisClient.DecrBy(config.RedisKeyPrefix+consumer, totalToken, nil)
-	}
+
+	inputToken = ctx.GetContext("input_token").(int64)
+	outputToken = ctx.GetContext("output_token").(int64)
+	consumer = ctx.GetContext("consumer").(string)
+	totalToken := int(inputToken + outputToken)
+	log.Debugf("update consumer:%s, totalToken:%d", consumer, totalToken)
+	config.redisClient.DecrBy(config.RedisKeyPrefix+consumer, totalToken, nil)
 	return data
 }
 
+func getUsage(data []byte) (inputTokenUsage int64, outputTokenUsage int64, ok bool) {
+	chunks := bytes.Split(bytes.TrimSpace(data), []byte("\n\n"))
+	for _, chunk := range chunks {
+		// the feature strings are used to identify the usage data, like:
+		// {"model":"gpt2","usage":{"prompt_tokens":1,"completion_tokens":1}}
+		if !bytes.Contains(chunk, []byte("prompt_tokens")) || !bytes.Contains(chunk, []byte("completion_tokens")) {
+			continue
+		}
+		inputTokenObj := gjson.GetBytes(chunk, "usage.prompt_tokens")
+		outputTokenObj := gjson.GetBytes(chunk, "usage.completion_tokens")
+		if inputTokenObj.Exists() && outputTokenObj.Exists() {
+			inputTokenUsage = inputTokenObj.Int()
+			outputTokenUsage = outputTokenObj.Int()
+			ok = true
+			return
+		}
+	}
+	return
+}
+
 func deniedNoKeyAuthData() types.Action {
 	util.SendResponse(http.StatusUnauthorized, "ai-quota.no_key", "text/plain", "Request denied by ai quota check. No Key Authentication information found.")
 	return types.ActionContinue