mtwm.getUploadImgPoiCode随机得到上传图片的美团店（看看是否是传图片API限频是按门店维度的）

business/partner/purchase/mtwm/mtwm.go

@@ -2,6 +2,7 @@ package mtwm
 
 import (
 	"fmt"
+	"math/rand"
 	"strings"
 	"sync"
 
@@ -24,8 +25,8 @@ type PurchaseHandler struct {
 	partner.BasePurchasePlatform
 	putils.DefSingleStorePlatform
 
-	poiCode4UploadImg string
-	locker            sync.RWMutex
+	storeIDs []string
+	locker   sync.RWMutex
 }
 
 func init() {
@@ -185,25 +186,30 @@ func (p *PurchaseHandler) UploadImg(ctx *jxcontext.Context, imgURL string, imgDa
 }
 
 func (p *PurchaseHandler) getUploadImgPoiCode() (poiCode string) {
+	var storeIDs []string
 	p.locker.RLock()
-	poiCode = p.poiCode4UploadImg
+	storeIDs = p.storeIDs
 	p.locker.RUnlock()
-	if poiCode != "" {
-		return poiCode
+	if len(storeIDs) > 0 {
+		return storeIDs[rand.Intn(len(storeIDs))]
 	}
 
 	p.locker.Lock()
-	poiCode = p.poiCode4UploadImg
-	if poiCode != "" {
+	storeIDs = p.storeIDs
+	if len(storeIDs) > 0 {
 		p.locker.Unlock()
-		return poiCode
+		return storeIDs[rand.Intn(len(storeIDs))]
 	}
 
 	defer p.locker.Unlock()
 	storeIDs, err := api.MtwmAPI.PoiGetIDs()
-	if err == nil && len(storeIDs) > 0 {
-		poiCode = storeIDs[0]
+	if err == nil {
+		if len(storeIDs) > 0 {
+			p.storeIDs = storeIDs
+			poiCode = storeIDs[rand.Intn(len(storeIDs))]
+		} else {
+			// p.storeIDs = []string{""}
+		}
 	}
-	p.poiCode4UploadImg = poiCode
 	return poiCode
 }