119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
// Copyright 2021 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !go1.17
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// +build !go1.17
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package prometheus
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import (
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"runtime"
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"testing"
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"time"
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dto "github.com/prometheus/client_model/go"
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)
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func TestGoCollectorMemStats(t *testing.T) {
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var (
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c = NewGoCollector().(*goCollector)
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got uint64
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)
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checkCollect := func(want uint64) {
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metricCh := make(chan Metric)
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endCh := make(chan struct{})
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go func() {
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c.Collect(metricCh)
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close(endCh)
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}()
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Collect:
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for {
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select {
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case metric := <-metricCh:
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if metric.Desc().fqName != "go_memstats_alloc_bytes" {
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continue Collect
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}
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pb := &dto.Metric{}
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metric.Write(pb)
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got = uint64(pb.GetGauge().GetValue())
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case <-endCh:
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break Collect
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}
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}
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if want != got {
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t.Errorf("unexpected value of go_memstats_alloc_bytes, want %d, got %d", want, got)
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}
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}
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// Speed up the timing to make the test faster.
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c.msMaxWait = 5 * time.Millisecond
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c.msMaxAge = 50 * time.Millisecond
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// Scenario 1: msRead responds slowly, no previous memstats available,
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// msRead is executed anyway.
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c.msRead = func(ms *runtime.MemStats) {
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time.Sleep(20 * time.Millisecond)
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ms.Alloc = 1
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}
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checkCollect(1)
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// Now msLast is set.
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c.msMtx.Lock()
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if want, got := uint64(1), c.msLast.Alloc; want != got {
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t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
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}
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c.msMtx.Unlock()
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// Scenario 2: msRead responds fast, previous memstats available, new
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// value collected.
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c.msRead = func(ms *runtime.MemStats) {
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ms.Alloc = 2
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}
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checkCollect(2)
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// msLast is set, too.
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c.msMtx.Lock()
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if want, got := uint64(2), c.msLast.Alloc; want != got {
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t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
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}
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c.msMtx.Unlock()
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// Scenario 3: msRead responds slowly, previous memstats available, old
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// value collected.
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c.msRead = func(ms *runtime.MemStats) {
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time.Sleep(20 * time.Millisecond)
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ms.Alloc = 3
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}
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checkCollect(2)
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// After waiting, new value is still set in msLast.
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time.Sleep(80 * time.Millisecond)
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c.msMtx.Lock()
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if want, got := uint64(3), c.msLast.Alloc; want != got {
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t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
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}
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c.msMtx.Unlock()
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// Scenario 4: msRead responds slowly, previous memstats is too old, new
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// value collected.
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c.msRead = func(ms *runtime.MemStats) {
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time.Sleep(20 * time.Millisecond)
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ms.Alloc = 4
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}
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checkCollect(4)
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c.msMtx.Lock()
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if want, got := uint64(4), c.msLast.Alloc; want != got {
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t.Errorf("unexpected of msLast.Alloc, want %d, got %d", want, got)
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}
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c.msMtx.Unlock()
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}
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