vitess.io/vitess@v0.16.2/go/vt/logutil/throttled_test.go (about)

     1  /*
     2  Copyright 2019 The Vitess 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 logutil
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  	"time"
    23  )
    24  
    25  func skippedCount(tl *ThrottledLogger) int {
    26  	tl.mu.Lock()
    27  	defer tl.mu.Unlock()
    28  	return tl.skippedCount
    29  }
    30  
    31  func TestThrottledLogger(t *testing.T) {
    32  	// Install a fake log func for testing.
    33  	log := make(chan string)
    34  	infoDepth = func(depth int, args ...any) {
    35  		log <- fmt.Sprint(args...)
    36  	}
    37  	interval := 100 * time.Millisecond
    38  	tl := NewThrottledLogger("name", interval)
    39  
    40  	start := time.Now()
    41  
    42  	go tl.Infof("test %v", 1)
    43  	if got, want := <-log, "name: test 1"; got != want {
    44  		t.Errorf("got %q, want %q", got, want)
    45  	}
    46  
    47  	go tl.Infof("test %v", 2)
    48  	if got, want := <-log, "name: skipped 1 log messages"; got != want {
    49  		t.Errorf("got %q, want %q", got, want)
    50  	}
    51  	if got, want := skippedCount(tl), 0; got != want {
    52  		t.Errorf("skippedCount is %v but was expecting %v after waiting", got, want)
    53  	}
    54  	if got := time.Since(start); got < interval {
    55  		t.Errorf("didn't wait long enough before logging, got %v, want >= %v", got, interval)
    56  	}
    57  
    58  	go tl.Infof("test %v", 3)
    59  	if got, want := <-log, "name: test 3"; got != want {
    60  		t.Errorf("got %q, want %q", got, want)
    61  	}
    62  	if got, want := skippedCount(tl), 0; got != want {
    63  		t.Errorf("skippedCount is %v but was expecting %v", got, want)
    64  	}
    65  }