github.com/matrixorigin/matrixone@v0.7.0/pkg/util/metric/testutil_test.go (about)

     1  // Copyright 2022 Matrix Origin
     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  // this file contains test utils. Name this file "*_test.go" to make
    16  // compiler ignore it
    17  
    18  package metric
    19  
    20  import (
    21  	"context"
    22  	"sync"
    23  	"sync/atomic"
    24  	"time"
    25  
    26  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    27  )
    28  
    29  // some tests will modify global variables, and something weird
    30  // may happen if they run concurrently.
    31  // use this mutex to make those tests execute sequentially
    32  var configMu *sync.Mutex = new(sync.Mutex)
    33  
    34  func withModifiedConfig(f func()) {
    35  	configMu.Lock()
    36  	defer configMu.Unlock()
    37  	f()
    38  }
    39  
    40  // waitWgTimeout returns an error if the WaitGroup doesn't return in timeout duration
    41  func waitWgTimeout(wg *sync.WaitGroup, after time.Duration) error {
    42  	c := make(chan struct{})
    43  	go func() {
    44  		defer close(c)
    45  		wg.Wait()
    46  	}()
    47  	select {
    48  	case <-time.After(time.Second):
    49  		return moerr.NewInternalError(context.Background(), "timeout")
    50  	case <-c:
    51  		return nil
    52  	}
    53  }
    54  
    55  func makeDummyClock(startOffset int64) func() int64 {
    56  	var tick = startOffset - 1
    57  	return func() int64 {
    58  		return atomic.AddInt64(&tick, 1)
    59  	}
    60  }
    61  
    62  type dummySwitch struct{}
    63  
    64  func (dummySwitch) Start(ctx context.Context) bool             { return true }
    65  func (dummySwitch) Stop(graceful bool) (<-chan struct{}, bool) { return nil, false }