fix: honor alert forwarding business responses

internal/ingest/alert_forward.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 	"strings"
 	"time"
@@ -11,6 +12,8 @@ import (
 	"git.apinb.com/ops/logs/internal/config"
 )
 
+const alertResponseBodyLimit = 1 << 20
+
 // AlertReceiveBody 与 alert ReceiveRequest 对齐（含必填 raw_data）
 type AlertReceiveBody struct {
 	AlertName    string            `json:"alert_name"`
@@ -57,10 +60,13 @@ func forwardAlert(body AlertReceiveBody) error {
 	if err != nil {
 		return err
 	}
-	url := cfg.BaseURL + "/Alert/v1/alerts/receive"
-	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(raw))
+	return postAlertPayload(cfg, "/Alert/v1/alerts/receive", raw)
+}
+
+func postAlertPayload(cfg *config.AlertForwardConf, path string, payload []byte) error {
+	req, err := http.NewRequest(http.MethodPost, cfg.BaseURL+path, bytes.NewReader(payload))
 	if err != nil {
-		return err
+		return fmt.Errorf("创建 Alert 转发请求失败：%w", err)
 	}
 	req.Header.Set("Content-Type", "application/json")
 	if cfg.InternalKey != "" {
@@ -69,11 +75,32 @@ func forwardAlert(body AlertReceiveBody) error {
 	client := &http.Client{Timeout: 10 * time.Second}
 	resp, err := client.Do(req)
 	if err != nil {
-		return err
+		return fmt.Errorf("发送 Alert 转发请求失败：%w", err)
 	}
 	defer resp.Body.Close()
+
+	responseBody, err := io.ReadAll(io.LimitReader(resp.Body, alertResponseBodyLimit+1))
+	if err != nil {
+		return fmt.Errorf("读取 Alert 响应失败：%w", err)
+	}
+	if len(responseBody) > alertResponseBodyLimit {
+		return fmt.Errorf("Alert 响应体超过 %d 字节限制，请稍后重试", alertResponseBodyLimit)
+	}
 	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("alert returned HTTP %d", resp.StatusCode)
+		return fmt.Errorf("Alert 返回 HTTP %d，请稍后重试", resp.StatusCode)
+	}
+
+	var result struct {
+		Code *int32 `json:"code"`
+	}
+	if err := json.Unmarshal(responseBody, &result); err != nil {
+		return fmt.Errorf("Alert 响应不是有效 JSON：%v；请稍后重试", err)
+	}
+	if result.Code == nil {
+		return fmt.Errorf("Alert 响应缺少 code，无法确认转发成功；请稍后重试")
+	}
+	if *result.Code != 0 {
+		return fmt.Errorf("Alert 拒绝转发，业务 code=%d；请稍后重试", *result.Code)
 	}
 	return nil
 }

internal/ingest/alert_outbox.go

@@ -1,10 +1,8 @@
 package ingest
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
-	"net/http"
 	"strings"
 	"time"
 
@@ -118,25 +116,7 @@ func forwardRawEvent(body RawEventIngestBody) error {
 	if err != nil {
 		return err
 	}
-	url := cfg.BaseURL + "/Alert/v1/raw-events/ingest"
-	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(raw))
-	if err != nil {
-		return err
-	}
-	req.Header.Set("Content-Type", "application/json")
-	if cfg.InternalKey != "" {
-		req.Header.Set("X-Internal-Key", cfg.InternalKey)
-	}
-	client := &http.Client{Timeout: 10 * time.Second}
-	resp, err := client.Do(req)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("alert returned HTTP %d", resp.StatusCode)
-	}
-	return nil
+	return postAlertPayload(cfg, "/Alert/v1/raw-events/ingest", raw)
 }
 
 func markOutboxRetry(row models.AlertOutbox, msg string) {