github.com/m3db/m3@v1.5.0/src/x/instrument/process_test.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package instrument
    22  
    23  import (
    24  	"fmt"
    25  	"io/ioutil"
    26  	"os"
    27  	"testing"
    28  	"time"
    29  
    30  	"github.com/fortytw2/leaktest"
    31  	"github.com/stretchr/testify/assert"
    32  	"github.com/stretchr/testify/require"
    33  	"github.com/uber-go/tally"
    34  )
    35  
    36  func TestProcessReporter(t *testing.T) {
    37  	defer leaktest.Check(t)()
    38  
    39  	scope := tally.NewTestScope("", nil)
    40  
    41  	countOpen := 32
    42  	closeFds := func() {}
    43  	for i := 0; i < countOpen; i++ {
    44  		tmpFile, err := ioutil.TempFile("", "example")
    45  		if err != nil {
    46  			require.FailNow(t, fmt.Sprintf("could not open temp file: %v", err))
    47  		}
    48  
    49  		// Explicitly close with closeFds call so we can defer the leaktest
    50  		// and it always executes last
    51  		currCloseFds := closeFds
    52  		closeFds = func() {
    53  			currCloseFds()
    54  			assert.NoError(t, tmpFile.Close())
    55  			assert.NoError(t, os.Remove(tmpFile.Name()))
    56  		}
    57  	}
    58  
    59  	every := 10 * time.Millisecond
    60  
    61  	r := NewProcessReporter(scope, every)
    62  	require.NoError(t, r.Start())
    63  
    64  	time.Sleep(2 * every)
    65  
    66  	_, ok := scope.Snapshot().Gauges()["process.num-fds+"]
    67  	if !ok {
    68  		require.FailNow(t, "metric for fds not found after waiting 2x interval")
    69  	}
    70  
    71  	require.NoError(t, r.Stop())
    72  
    73  	closeFds()
    74  }
    75  
    76  func TestProcessReporterDoesNotOpenMoreThanOnce(t *testing.T) {
    77  	r := NewProcessReporter(tally.NoopScope, 10*time.Millisecond)
    78  	assert.NoError(t, r.Start())
    79  	assert.Error(t, r.Start())
    80  	assert.NoError(t, r.Stop())
    81  }
    82  
    83  func TestProcessReporterDoesNotCloseMoreThanOnce(t *testing.T) {
    84  	r := NewProcessReporter(tally.NoopScope, 10*time.Millisecond)
    85  	assert.NoError(t, r.Start())
    86  	assert.NoError(t, r.Stop())
    87  	assert.Error(t, r.Stop())
    88  }
    89  
    90  func TestProcessReporterDoesNotOpenWithInvalidReportInterval(t *testing.T) {
    91  	r := NewProcessReporter(tally.NoopScope, 0)
    92  	assert.Error(t, r.Start())
    93  }