istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/test/loadbalancersim/network/helper.go (about)

     1  //  Copyright Istio Authors
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  package network
    16  
    17  import (
    18  	"time"
    19  
    20  	"go.uber.org/atomic"
    21  
    22  	"istio.io/istio/pkg/test/loadbalancersim/timeseries"
    23  )
    24  
    25  type ConnectionHelper struct {
    26  	name   string
    27  	hist   timeseries.Instance
    28  	active *atomic.Uint64
    29  	total  *atomic.Uint64
    30  }
    31  
    32  func NewConnectionHelper(name string) *ConnectionHelper {
    33  	return &ConnectionHelper{
    34  		active: atomic.NewUint64(0),
    35  		total:  atomic.NewUint64(0),
    36  		name:   name,
    37  	}
    38  }
    39  
    40  func (c *ConnectionHelper) Name() string {
    41  	return c.name
    42  }
    43  
    44  func (c *ConnectionHelper) TotalRequests() uint64 {
    45  	return c.total.Load()
    46  }
    47  
    48  func (c *ConnectionHelper) ActiveRequests() uint64 {
    49  	return c.active.Load()
    50  }
    51  
    52  func (c *ConnectionHelper) Latency() *timeseries.Instance {
    53  	return &c.hist
    54  }
    55  
    56  func (c *ConnectionHelper) Request(request func(onDone func()), onDone func()) {
    57  	start := time.Now()
    58  	c.total.Inc()
    59  	c.active.Inc()
    60  
    61  	wrappedDone := func() {
    62  		// Calculate the latency for this request.
    63  		latency := time.Since(start)
    64  
    65  		// Add the latency observation.
    66  		c.hist.AddObservation(latency.Seconds(), time.Now())
    67  
    68  		c.active.Dec()
    69  
    70  		// Invoke the caller's handler.
    71  		onDone()
    72  	}
    73  
    74  	request(wrappedDone)
    75  }