github.com/cloudwego/kitex@v0.9.0/pkg/utils/rpcstats.go (about)

     1  /*
     2   * Copyright 2021 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package utils
    18  
    19  import (
    20  	"time"
    21  
    22  	"github.com/cloudwego/kitex/pkg/rpcinfo"
    23  	"github.com/cloudwego/kitex/pkg/stats"
    24  )
    25  
    26  // CalculateEventCost get events from rpcstats, and calculates the time duration of (end - start).
    27  // It returns 0 when get nil rpcinfo event of either stats event.
    28  func CalculateEventCost(rpcstats rpcinfo.RPCStats, start, end stats.Event) time.Duration {
    29  	endEvent := rpcstats.GetEvent(end)
    30  	startEvent := rpcstats.GetEvent(start)
    31  	if startEvent == nil || endEvent == nil {
    32  		return 0
    33  	}
    34  	return endEvent.Time().Sub(startEvent.Time())
    35  }