istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/test/loadbalancersim/mesh/client.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 mesh
    16  
    17  import (
    18  	"sync"
    19  	"time"
    20  
    21  	"istio.io/istio/pkg/test/loadbalancersim/locality"
    22  	"istio.io/istio/pkg/test/loadbalancersim/network"
    23  )
    24  
    25  type ClientSettings struct {
    26  	RPS      int
    27  	Locality locality.Instance
    28  }
    29  
    30  type Client struct {
    31  	mesh *Instance
    32  	s    ClientSettings
    33  }
    34  
    35  func (c *Client) Mesh() *Instance {
    36  	return c.mesh
    37  }
    38  
    39  func (c *Client) Locality() locality.Instance {
    40  	return c.s.Locality
    41  }
    42  
    43  func (c *Client) SendRequests(conn network.Connection, numRequests int, done func()) {
    44  	go func() {
    45  		wg := sync.WaitGroup{}
    46  
    47  		interval := time.Duration((1.0 / float64(c.s.RPS)) * float64(time.Second))
    48  
    49  		ticker := time.NewTicker(interval)
    50  		for {
    51  			// Wait for to send the next request.
    52  			<-ticker.C
    53  
    54  			// Send a request
    55  			wg.Add(1)
    56  			conn.Request(wg.Done)
    57  			numRequests--
    58  
    59  			if numRequests <= 0 {
    60  				ticker.Stop()
    61  
    62  				// Wait for all pending requests to complete.
    63  				wg.Wait()
    64  				done()
    65  				return
    66  			}
    67  		}
    68  	}()
    69  }