http请求支持预热接口数据并缓存

client.go

@@ -148,7 +148,42 @@ func (hc *HttpClient) Request() *define.Response {
 	)
 
 	if cacheResult = hc.getCacheResult(); nil != cacheResult {
-		return cacheResult
+		// 判断是否开启预热
+		inputCachePreHeatConfig := hc.cacheInstance.PreHeatConfig()
+		var cachePreHeatConfig define.CachePreHeatConfig
+		serialize.JSON.TransitionIgnoreError(inputCachePreHeatConfig, &cachePreHeatConfig)
+		if !cachePreHeatConfig.Enable || (cachePreHeatConfig.MinTTL <= 0 && cachePreHeatConfig.MinPercent <= 0 && !cachePreHeatConfig.Force) {
+			// 无预热配置或未启用预热或者未设置预热规则
+			return cacheResult
+		}
+		go func() {
+			// 判断是否触发预热
+			if cachePreHeatConfig.Force {
+				_ = hc.requestBackendApi()
+				return
+			}
+			// 将百分比的配置归一化成最小剩余时间的配置
+			if cachePreHeatConfig.MinPercent > 0 {
+				expectMinTTL := hc.cacheInstance.CacheTime() * cachePreHeatConfig.MinPercent / 100
+				if cachePreHeatConfig.MinTTL == 0 || cachePreHeatConfig.MinTTL > expectMinTTL {
+					cachePreHeatConfig.MinTTL = expectMinTTL
+				}
+			}
+			if cachePreHeatConfig.MinTTL <= 0 {
+				// 未配置最小剩余时间
+				return
+			}
+			ttl := hc.cacheInstance.TTL(cacheResult.CacheInfo.CacheKey)
+			if ttl < 0 {
+				// 不存在或者未设置有效期
+				return
+			}
+
+			if ttl <= cachePreHeatConfig.MinTTL {
+				// 配置了最小剩余时间,并且key剩余有效期小于最小剩余时间
+				_ = hc.requestBackendApi()
+			}
+		}()
 	}
 
 	return hc.requestBackendApi()