138 lines
2.7 KiB
Go
138 lines
2.7 KiB
Go
package log_test
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import (
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"math/rand"
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"os"
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"sync"
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"time"
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"github.com/go-kit/kit/log"
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)
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func Example_basic() {
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logger := log.NewLogfmtLogger(os.Stdout)
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type Task struct {
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ID int
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}
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RunTask := func(task Task, logger log.Logger) {
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logger.Log("taskID", task.ID, "event", "starting task")
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logger.Log("taskID", task.ID, "event", "task complete")
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}
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RunTask(Task{ID: 1}, logger)
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// Output:
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// taskID=1 event="starting task"
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// taskID=1 event="task complete"
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}
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func Example_contextual() {
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logger := log.NewLogfmtLogger(os.Stdout)
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type Task struct {
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ID int
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Cmd string
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}
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taskHelper := func(cmd string, logger log.Logger) {
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// execute(cmd)
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logger.Log("cmd", cmd, "dur", 42*time.Millisecond)
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}
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RunTask := func(task Task, logger log.Logger) {
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logger = log.With(logger, "taskID", task.ID)
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logger.Log("event", "starting task")
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taskHelper(task.Cmd, logger)
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logger.Log("event", "task complete")
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}
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RunTask(Task{ID: 1, Cmd: "echo Hello, world!"}, logger)
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// Output:
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// taskID=1 event="starting task"
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// taskID=1 cmd="echo Hello, world!" dur=42ms
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// taskID=1 event="task complete"
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}
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func Example_valuer() {
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logger := log.NewLogfmtLogger(os.Stdout)
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count := 0
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counter := func() interface{} {
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count++
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return count
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}
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logger = log.With(logger, "count", log.Valuer(counter))
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logger.Log("call", "first")
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logger.Log("call", "second")
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// Output:
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// count=1 call=first
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// count=2 call=second
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}
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func Example_debugInfo() {
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logger := log.NewLogfmtLogger(os.Stdout)
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// make time predictable for this test
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baseTime := time.Date(2015, time.February, 3, 10, 0, 0, 0, time.UTC)
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mockTime := func() time.Time {
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baseTime = baseTime.Add(time.Second)
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return baseTime
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}
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logger = log.With(logger, "time", log.Timestamp(mockTime), "caller", log.DefaultCaller)
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logger.Log("call", "first")
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logger.Log("call", "second")
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// ...
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logger.Log("call", "third")
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// Output:
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// time=2015-02-03T10:00:01Z caller=example_test.go:93 call=first
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// time=2015-02-03T10:00:02Z caller=example_test.go:94 call=second
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// time=2015-02-03T10:00:03Z caller=example_test.go:98 call=third
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}
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func Example_syncWriter() {
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w := log.NewSyncWriter(os.Stdout)
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logger := log.NewLogfmtLogger(w)
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type Task struct {
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ID int
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}
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var wg sync.WaitGroup
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RunTask := func(task Task, logger log.Logger) {
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logger.Log("taskID", task.ID, "event", "starting task")
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time.Sleep(time.Duration(rand.Intn(200)) * time.Millisecond)
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logger.Log("taskID", task.ID, "event", "task complete")
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wg.Done()
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}
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wg.Add(2)
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go RunTask(Task{ID: 1}, logger)
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go RunTask(Task{ID: 2}, logger)
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wg.Wait()
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// Unordered output:
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// taskID=1 event="starting task"
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// taskID=2 event="starting task"
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// taskID=1 event="task complete"
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// taskID=2 event="task complete"
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}
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