agent/handlers/v2/task_container_metadata_handler.go
func TaskContainerMetadataHandler(state dockerstate.TaskEngineState, ecsClient api.ECSClient, cluster, az, containerInstanceArn string, propagateTags bool) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		taskARN, err := getTaskARNByRequest(r, state)
		if err != nil {
			responseJSON, _ := json.Marshal(
				fmt.Sprintf("Unable to get task arn from request: %s", err.Error()))
			utils.WriteJSONToResponse(w, http.StatusBadRequest, responseJSON, utils.RequestTypeTaskMetadata)
			return
		}
		if containerID, ok := utils.GetMuxValueFromRequest(r, metadataContainerIDMuxName); ok {
			seelog.Infof("V2 task/container metadata handler: writing response for container '%s'", containerID)
			WriteContainerMetadataResponse(w, containerID, state)
			return
		}

		seelog.Infof("V2 task/container metadata handler: writing response for task '%s'", taskARN)
		WriteTaskMetadataResponse(w, taskARN, cluster, state, ecsClient, az, containerInstanceArn, propagateTags)
	}
}
func TaskContainerMetadataHandler(state dockerstate.TaskEngineState, ecsClient api.ECSClient, cluster, az, containerInstanceArn string, propagateTags bool) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		taskARN, err := getTaskARNByRequest(r, state)
		if err != nil {
			responseJSON, _ := json.Marshal(
				fmt.Sprintf("Unable to get task arn from request: %s", err.Error()))
			utils.WriteJSONToResponse(w, http.StatusBadRequest, responseJSON, utils.RequestTypeTaskMetadata)
			return
		}
		if containerID, ok := utils.GetMuxValueFromRequest(r, metadataContainerIDMuxName); ok {
			seelog.Infof("V2 task/container metadata handler: writing response for container '%s'", containerID)
			WriteContainerMetadataResponse(w, containerID, state)
			return
		}

		seelog.Infof("V2 task/container metadata handler: writing response for task '%s'", taskARN)
		WriteTaskMetadataResponse(w, taskARN, cluster, state, ecsClient, az, containerInstanceArn, propagateTags)
	}
}
// TaskContainerMetadataHandler returns the handler method for handling task and container metadata requests.