mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 10:09:05 +02:00
124 lines
2.9 KiB
Go
124 lines
2.9 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 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 windows
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package eventlog
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import (
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"os"
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"sync"
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"testing"
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"github.com/stretchr/testify/require"
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)
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// fakeEventLog records the events it receives and fails every use after Close,
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// like a closed event log handle.
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type fakeEventLog struct {
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mu sync.Mutex
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events []string
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closes int
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}
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func (f *fakeEventLog) record(level, msg string) error {
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f.mu.Lock()
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defer f.mu.Unlock()
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if f.closes > 0 {
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return os.ErrInvalid
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}
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f.events = append(f.events, level+": "+msg)
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return nil
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}
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func (f *fakeEventLog) Info(_ uint32, msg string) error { return f.record("info", msg) }
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func (f *fakeEventLog) Warning(_ uint32, msg string) error { return f.record("warning", msg) }
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func (f *fakeEventLog) Error(_ uint32, msg string) error { return f.record("error", msg) }
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func (f *fakeEventLog) Close() error {
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f.mu.Lock()
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defer f.mu.Unlock()
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f.closes++
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return nil
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}
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func TestWriterLevels(t *testing.T) {
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t.Parallel()
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handle := &fakeEventLog{}
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writer := &Writer{handle: handle}
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for _, line := range []string{
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"time=2026-10-15T14:03:05Z level=INFO msg=started\n",
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"time=2026-10-15T14:03:05Z level=WARN msg=slow\n",
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"time=2026-10-15T14:03:05Z level=ERROR msg=failed\n",
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} {
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n, err := writer.Write([]byte(line))
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require.NoError(t, err)
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require.Equal(t, len(line), n)
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}
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require.Equal(t, []string{"info: msg=started", "warning: msg=slow", "error: msg=failed"}, handle.events)
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}
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func TestWriterWriteAfterClose(t *testing.T) {
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t.Parallel()
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handle := &fakeEventLog{}
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writer := &Writer{handle: handle}
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require.NoError(t, writer.Close())
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require.NoError(t, writer.Close(), "a second Close is a no-op")
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require.Equal(t, 1, handle.closes, "the handle must be closed once")
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n, err := writer.Write([]byte("level=INFO msg=late\n"))
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require.ErrorIs(t, err, os.ErrClosed)
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require.Zero(t, n)
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require.Empty(t, handle.events)
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}
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func TestWriterConcurrentClose(t *testing.T) {
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t.Parallel()
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handle := &fakeEventLog{}
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writer := &Writer{handle: handle}
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var wg sync.WaitGroup
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for range 8 {
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wg.Go(func() {
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for range 100 {
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// A write either reaches the open handle or fails with os.ErrClosed.
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if _, err := writer.Write([]byte("level=INFO msg=x\n")); err != nil {
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require.ErrorIs(t, err, os.ErrClosed)
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}
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}
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})
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}
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wg.Go(func() {
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require.NoError(t, writer.Close())
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})
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wg.Wait()
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require.Equal(t, 1, handle.closes)
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}
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