mirror of
https://github.com/ethereum/go-ethereum.git
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7118cc2fc9
resetting timers and resetting samples now track cumulative count and sum across snapshots so that prometheus _count and _sum metrics monotonically increase as required by the prometheus spec. the per-window values and percentiles still reset normally.
109 lines
3 KiB
Go
109 lines
3 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package prometheus
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import (
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"fmt"
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"os"
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"strings"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/metrics/internal"
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)
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func TestMain(m *testing.M) {
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metrics.Enable()
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os.Exit(m.Run())
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}
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func TestCollector(t *testing.T) {
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var (
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c = newCollector()
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want string
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)
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internal.ExampleMetrics().Each(func(name string, i interface{}) {
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c.Add(name, i)
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})
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if wantB, err := os.ReadFile("./testdata/prometheus.want"); err != nil {
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t.Fatal(err)
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} else {
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want = string(wantB)
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}
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if have := c.buff.String(); have != want {
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t.Logf("have\n%v", have)
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t.Logf("have vs want:\n%v", findFirstDiffPos(have, want))
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t.Fatalf("unexpected collector output")
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}
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}
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func TestResettingTimerCumulativePrometheus(t *testing.T) {
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registry := metrics.NewRegistry()
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timer := metrics.NewRegisteredResettingTimer("test/resetting", registry)
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// First batch of updates.
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timer.Update(10 * time.Millisecond)
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timer.Update(20 * time.Millisecond)
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// First scrape.
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c1 := newCollector()
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registry.Each(func(name string, i interface{}) {
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c1.Add(name, i)
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})
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out1 := c1.buff.String()
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if !strings.Contains(out1, "test_resetting_count 2") {
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t.Fatalf("first scrape should have count 2, got:\n%s", out1)
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}
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// Second batch.
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timer.Update(30 * time.Millisecond)
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// Second scrape - count should be cumulative (3, not 1).
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c2 := newCollector()
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registry.Each(func(name string, i interface{}) {
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c2.Add(name, i)
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})
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out2 := c2.buff.String()
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if !strings.Contains(out2, "test_resetting_count 3") {
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t.Fatalf("second scrape should have cumulative count 3, got:\n%s", out2)
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}
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// Third scrape with no new updates - count should stay at 3.
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c3 := newCollector()
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registry.Each(func(name string, i interface{}) {
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c3.Add(name, i)
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})
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out3 := c3.buff.String()
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// With no new events and totalCount > 0, we still need to report.
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if !strings.Contains(out3, "test_resetting_count 3") {
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t.Fatalf("third scrape should still report cumulative count 3, got:\n%s", out3)
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}
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}
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func findFirstDiffPos(a, b string) string {
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yy := strings.Split(b, "\n")
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for i, x := range strings.Split(a, "\n") {
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if i >= len(yy) {
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return fmt.Sprintf("have:%d: %s\nwant:%d: <EOF>", i, x, i)
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}
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if y := yy[i]; x != y {
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return fmt.Sprintf("have:%d: %s\nwant:%d: %s", i, x, i, y)
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}
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}
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return ""
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}
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