mirror of
https://github.com/tailscale/tailscale.git
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93 lines
2.3 KiB
Go
93 lines
2.3 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tstest
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import (
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"log"
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"os"
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"sync"
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"testing"
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"tailscale.com/types/logger"
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)
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type testLogWriter struct {
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t *testing.T
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}
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func (w *testLogWriter) Write(b []byte) (int, error) {
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w.t.Helper()
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w.t.Logf("%s", b)
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return len(b), nil
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}
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func FixLogs(t *testing.T) {
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log.SetFlags(log.Ltime | log.Lshortfile)
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log.SetOutput(&testLogWriter{t})
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}
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func UnfixLogs(t *testing.T) {
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defer log.SetOutput(os.Stderr)
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}
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type panicLogWriter struct{}
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func (panicLogWriter) Write(b []byte) (int, error) {
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panic("please use tailscale.com/logger.Logf instead of the log package")
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}
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// PanicOnLog modifies the standard library log package's default output to
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// an io.Writer that panics, to root out code that's not plumbing their logging
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// through explicit tailscale.com/logger.Logf paths.
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func PanicOnLog() {
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log.SetOutput(panicLogWriter{})
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}
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// NewLogLineTracker produces a LogLineTracker wrapping a given logf that tracks whether expectedFormatStrings were seen.
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func NewLogLineTracker(logf logger.Logf, expectedFormatStrings []string) *LogLineTracker {
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ret := &LogLineTracker{
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logf: logf,
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listenFor: expectedFormatStrings,
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seen: make(map[string]bool),
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}
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for _, line := range expectedFormatStrings {
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ret.seen[line] = false
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}
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return ret
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}
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// LogLineTracker is a logger that tracks which log format patterns it's
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// seen and can report which expected ones were not seen later.
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type LogLineTracker struct {
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logf logger.Logf
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listenFor []string
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mu sync.Mutex
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seen map[string]bool // format string => false (if not yet seen but wanted) or true (once seen)
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}
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// Logf logs to its underlying logger and also tracks that the given format pattern has been seen.
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func (lt *LogLineTracker) Logf(format string, args ...interface{}) {
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lt.mu.Lock()
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if v, ok := lt.seen[format]; ok && !v {
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lt.seen[format] = true
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}
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lt.mu.Unlock()
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lt.logf(format, args...)
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}
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// Check returns which format strings haven't been logged yet.
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func (lt *LogLineTracker) Check() []string {
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lt.mu.Lock()
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defer lt.mu.Unlock()
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var notSeen []string
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for _, format := range lt.listenFor {
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if !lt.seen[format] {
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notSeen = append(notSeen, format)
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}
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}
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return notSeen
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}
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