feat: 分析响应JSON解析

service/error_analysis.go

@@ -0,0 +1,28 @@
+package service
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// parseAnalysisResponse 解析分析模型输出的判定 JSON。
+// 容错：剥 ```json 代码块/首尾空白/多余文字，取首个 {...}。
+func parseAnalysisResponse(content string) (retryable bool, reason string, err error) {
+	s := strings.TrimSpace(content)
+	s = strings.TrimPrefix(s, "```json")
+	s = strings.TrimSuffix(s, "```")
+	s = strings.TrimSpace(s)
+	start, end := strings.IndexByte(s, '{'), strings.LastIndexByte(s, '}')
+	if start < 0 || end <= start {
+		return false, "", fmt.Errorf("分析响应中未找到JSON对象: %q", content)
+	}
+	var obj struct {
+		Retryable bool   `json:"retryable"`
+		Reason    string `json:"reason"`
+	}
+	if err = json.Unmarshal([]byte(s[start:end+1]), &obj); err != nil {
+		return false, "", fmt.Errorf("分析响应JSON解析失败: %v", err)
+	}
+	return obj.Retryable, obj.Reason, nil
+}

service/error_analysis_test.go

@@ -0,0 +1,43 @@
+package service
+
+import "testing"
+
+func TestParseAnalysisResponse(t *testing.T) {
+	cases := []struct {
+		name      string
+		in        string
+		wantRetry bool
+		wantErr   bool
+	}{
+		{"纯JSON", `{"retryable": true, "reason": "限流"}`, true, false},
+		{"带json代码块", "```json\n{\"retryable\": false, \"reason\": \"参数错误\"}\n```", false, false},
+		{"带前后文字", `分析结果: {"retryable": true, "reason": "瞬时故障"} 完毕`, true, false},
+		{"非法响应", `抱歉，我无法分析`, false, true},
+		{"空串", ``, false, true},
+	}
+	for _, c := range cases {
+		retry, _, err := parseAnalysisResponse(c.in)
+		if c.wantErr {
+			if err == nil {
+				t.Fatalf("[%s] 期望错误, got retry=%v", c.name, retry)
+			}
+			continue
+		}
+		if err != nil {
+			t.Fatalf("[%s] 不应报错: %v", c.name, err)
+		}
+		if retry != c.wantRetry {
+			t.Fatalf("[%s] retryable = %v, want %v", c.name, retry, c.wantRetry)
+		}
+	}
+}
+
+func TestParseAnalysisResponseReason(t *testing.T) {
+	_, reason, err := parseAnalysisResponse(`{"retryable": true, "reason": "服务过载"}`)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if reason != "服务过载" {
+		t.Fatalf("reason = %q, want 服务过载", reason)
+	}
+}