fix: add context timeout to LLM query and limit the return length to …

…less than 10000 characters.

internal/llm/llm.go

@@ -4,7 +4,9 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"time"
 
+	"github.com/qiniu/reviewbot/internal/util"
 	"github.com/tmc/langchaingo/llms"
 )
 
@@ -30,11 +32,21 @@ func New(ctx context.Context, config Config) (llms.Model, error) {
 }
 
 func Query(ctx context.Context, model llms.Model, query string, extraContext string) (string, error) {
+	log := util.FromContext(ctx)
 	ragQuery := fmt.Sprintf(ragTemplateStr, query, extraContext)
-	respText, err := llms.GenerateFromSinglePrompt(ctx, model, ragQuery)
+
+	timeout := 5 * time.Minute
+	ctxWithTimeout, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+
+	respText, err := llms.GenerateFromSinglePrompt(ctxWithTimeout, model, ragQuery)
 	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) {
+			log.Warnf("LLM query operation timed out after %s", timeout)
+		}
 		return "", err
 	}
+	log.Debugf("length of LLM respText: %d", len(respText))
 	return respText, nil
 }
 
@@ -60,20 +72,32 @@ Context:
 `
 
 func QueryForReference(ctx context.Context, model llms.Model, linterOutput string) (string, error) {
+	log := util.FromContext(ctx)
 	if model == nil {
 		return "", ErrModelIsNil
 	}
 	ragQuery := fmt.Sprintf(referenceTemplateStr, linterOutput)
-	respText, err := llms.GenerateFromSinglePrompt(ctx, model, ragQuery)
+
+	timeout := 5 * time.Minute
+	ctxWithTimeout, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+
+	respText, err := llms.GenerateFromSinglePrompt(ctxWithTimeout, model, ragQuery)
 	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) {
+			log.Warnf("LLM query operation timed out after %s", timeout)
+		}
 		return "", err
 	}
+	log.Debugf("length of LLM respText: %d", len(respText))
+
 	return respText, nil
 }
 
 const referenceTemplateStr = `
 You are a lint expert, you can explain in detail the meaning of the lint result according to the content of the given context.
 You will follow the format of the example in <format> to answer in Chinese, firstly, you will explain the lint, secondly, you will give the incorrect usage (it can be a code example or text description), and finally, you will give the correct usage (it can be a code example or a text description), and finally add a blank line before the result.
+Please make sure that the output must not exceed 10,000 characters.
 
 <format>