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// Tideland Go Library - Monitoring - Unit Tests
//
// Copyright (C) 2009-2017 Frank Mueller / Tideland / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package monitoring_test
//--------------------
// IMPORTS
//--------------------
import (
"fmt"
"math/rand"
"testing"
"time"
"github.com/tideland/golib/audit"
"github.com/tideland/golib/monitoring"
)
//--------------------
// TESTS
//--------------------
// Test of the ETM monitor.
func TestETMMonitor(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
monitoring.SetBackend(monitoring.NewStandardBackend())
// Generate measurings.
for i := 0; i < 500; i++ {
n := rand.Intn(10)
id := fmt.Sprintf("mp:task:%d", n)
m := monitoring.BeginMeasuring(id)
work(n * 5000)
m.EndMeasuring()
}
// Need some time to let that backend catch up queued mesurings.
time.Sleep(time.Millisecond)
// Asserts.
mp, err := monitoring.ReadMeasuringPoint("foo")
assert.ErrorMatch(err, `.* measuring point "foo" does not exist`)
mp, err = monitoring.ReadMeasuringPoint("mp:task:5")
assert.Nil(err, "No error expected.")
assert.Equal(mp.ID(), "mp:task:5", "should get the right one")
assert.True(mp.Count() > 0, "should be measured several times")
assert.Match(mp.String(), `Measuring Point "mp:task:5" \(.*\)`, "string representation should look fine")
monitoring.MeasuringPointsDo(func(mp monitoring.MeasuringPoint) {
assert.Match(mp.ID(), "mp:task:[0-9]", "id has to match the pattern")
assert.True(mp.MinDuration() <= mp.AvgDuration() && mp.AvgDuration() <= mp.MaxDuration(),
"avg should be somewhere between min and max")
})
}
// Test of the SSI monitor.
func TestSSIMonitor(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
monitoring.SetBackend(monitoring.NewStandardBackend())
// Generate values.
for i := 0; i < 500; i++ {
n := rand.Intn(10)
id := fmt.Sprintf("ssv:value:%d", n)
monitoring.SetVariable(id, rand.Int63n(2001)-1000)
}
// Need some time to let that backend catch up queued mesurings.
time.Sleep(time.Millisecond)
// Asserts.
ssv, err := monitoring.ReadVariable("foo")
assert.ErrorMatch(err, `.* stay-set variable "foo" does not exist`)
ssv, err = monitoring.ReadVariable("ssv:value:5")
assert.Nil(err, "no error expected")
assert.Equal(ssv.ID(), "ssv:value:5", "should get the right one")
assert.True(ssv.Count() > 0, "should be set several times")
assert.Match(ssv.String(), `Stay-Set Variable "ssv:value:5" (.*)`)
monitoring.StaySetVariablesDo(func(ssv monitoring.StaySetVariable) {
assert.Match(ssv.ID(), "ssv:value:[0-9]", "id has to match the pattern")
assert.True(ssv.MinValue() <= ssv.AvgValue() && ssv.AvgValue() <= ssv.MaxValue(),
"avg should be somewhere between min and max")
})
}
// Test of the DSR monitor.
func TestDSRMonitor(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
monitoring.SetBackend(monitoring.NewStandardBackend())
// Register monitoring funcs.
monitoring.Register("dsr:a", func() (string, error) { return "A", nil })
monitoring.Register("dsr:b", func() (string, error) { return "4711", nil })
monitoring.Register("dsr:c", func() (string, error) { return "2012-02-15", nil })
monitoring.Register("dsr:d", func() (string, error) { a := 1; a = a / (a - a); return fmt.Sprintf("%d", a), nil })
// Need some time to let that backend catch up queued registerings.
time.Sleep(time.Millisecond)
// Asserts.
dsv, err := monitoring.ReadStatus("foo")
assert.ErrorMatch(err, `.* dynamic status "foo" does not exist`)
dsv, err = monitoring.ReadStatus("dsr:b")
assert.Nil(err, "no error expected")
assert.Equal(dsv, "4711", "status value should be correct")
_, err = monitoring.ReadStatus("dsr:d")
assert.NotNil(err, "error should be returned")
assert.ErrorMatch(err, `.* monitoring backend panicked`)
}
// TestStandardInternalPanic tests the clean handling of panics
// when retrieving a status with the standard backend.
func TestInternalPanic(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
monitoring.SetBackend(monitoring.NewStandardBackend())
// Register monitoring func with panic.
monitoring.Register("panic", func() (string, error) { panic("ouch") })
// Need some time to let that backend catch up queued registering.
time.Sleep(time.Millisecond)
// Asserts.
status, err := monitoring.ReadStatus("panic")
assert.Empty(status, "no dynamic status value")
assert.ErrorMatch(err, `.* monitoring backend panicked`)
}
// TestBackendSwitch tests the correct switching between backends.
func TestBackendSwitch(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
sleep := 10 * time.Millisecond
// First standard.
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.Measure("test-a", func() { time.Sleep(sleep) })
time.Sleep(sleep)
mp, err := monitoring.ReadMeasuringPoint("test-a")
assert.Nil(err)
assert.Equal(mp.Count(), int64(1))
assert.True(sleep <= mp.AvgDuration() && mp.AvgDuration() <= 2*sleep)
// Then null.
monitoring.SetBackend(monitoring.NewNullBackend())
monitoring.Measure("test", func() { time.Sleep(sleep) })
mp, err = monitoring.ReadMeasuringPoint("test")
assert.Nil(err)
assert.Equal(mp.ID(), "null")
assert.Equal(mp.Count(), int64(0))
// Finally standard again.
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.Measure("test-b", func() { time.Sleep(sleep) })
time.Sleep(sleep)
mp, err = monitoring.ReadMeasuringPoint("test-a")
assert.ErrorMatch(err, `.* measuring point "test-a" does not exist`)
mp, err = monitoring.ReadMeasuringPoint("test-b")
assert.Nil(err)
assert.Equal(mp.Count(), int64(1))
assert.True(sleep <= mp.AvgDuration() && mp.AvgDuration() <= 2*sleep)
}
//--------------------
// BENCHMARKS
//--------------------
// BenchmarkStandardBackendETM checks the performance of the ETM of the
// standard backend.
func BenchmarkStandardBackendETM(b *testing.B) {
monitoring.SetBackend(monitoring.NewStandardBackend())
for i := 0; i < b.N; i++ {
monitoring.Measure("test", func() {})
}
}
// BenchmarkFilteredStandardBackendETM checks the performance of the ETM
// of the standard backend when filtered.
func BenchmarkFilteredStandardBackendETM(b *testing.B) {
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.SetMeasuringsFilter(func(id string) bool {
return id != "test"
})
defer monitoring.SetMeasuringsFilter(nil)
for i := 0; i < b.N; i++ {
monitoring.Measure("test", func() {})
}
}
// BenchmarkNullBackendETM checks the performance of the ETM of the
// null backend.
func BenchmarkNullBackendETM(b *testing.B) {
monitoring.SetBackend(monitoring.NewNullBackend())
for i := 0; i < b.N; i++ {
monitoring.Measure("test", func() {})
}
}
//--------------------
// HELPERS
//--------------------
// Do some work.
func work(n int) int {
if n < 0 {
return 0
}
return n * work(n-1)
}
// EOF
|
