func main() {
// Bind a new logger to a variable. You may create any number of loggers.
ctx := kiwi.New()
// For starting write ctx records to some writer output should be initialized.
out := kiwi.SinkTo(os.Stdout, kiwi.UseLogfmt()).Start()
// setup context of the logger
ctx.With("userID", 1000, "host", "local", "startedAt", time.Now())
// This record will be supplemented by startedAt value of time.Now().String()
ctx.Add("sample", 1).Log()
// This record also will be supplemented by the same value of the time.
// Because context value evalueted when it was added by ctx.With().
ctx.Add("sample", 2).Log()
// You can provide deferred evaluation of context or ctx values if you add them wrapped
// with func() interface{}, where interface should be one of scalar golang types.
ctx.With("currentTime", func() string { return time.Now().String() })
// Get previously saved context for use in the application.
// They were keep as is without conversion to strings.
currentContext := ctx.GetContext()
fmt.Printf("some of the context values are: %d, %s\n", currentContext["userID"], currentContext["host"])
// These records will be output each its own currentTime value because currentTime will
// be evaluated on each Log() call.
ctx.Add("sample", 3).Log()
ctx.Add("sample", 4).Log()
out.Flush()
}
func BenchmarkLevelsKiwiTypedHelpers_JSON(b *testing.B) {
buf := &bytes.Buffer{}
b.ResetTimer()
l := kiwi.New()
l.With("_n", "bench", "_p", pid)
l.WithTimestamp(time.RFC3339)
kiwi.LevelName = "l"
out := kiwi.SinkTo(buf, kiwi.UseJSON()).Start()
for i := 0; i < b.N; i++ {
l.AddPairs(
kiwi.AsInt("key", 1),
kiwi.AsFloat64("key2", 3.141592),
kiwi.AsString("key3", "string"),
kiwi.AsBool("key4", false)).Debug()
l.AddPairs(
kiwi.AsInt("key", 1),
kiwi.AsFloat64("key2", 3.141592),
kiwi.AsString("key3", "string"),
kiwi.AsBool("key4", false)).Info()
l.AddPairs(
kiwi.AsInt("key", 1),
kiwi.AsFloat64("key2", 3.141592),
kiwi.AsString("key3", "string"),
kiwi.AsBool("key4", false)).Warn()
l.AddPairs(
kiwi.AsInt("key", 1),
kiwi.AsFloat64("key2", 3.141592),
kiwi.AsString("key3", "string"),
kiwi.AsBool("key4", false)).Error()
}
b.StopTimer()
out.Close()
}
func BenchmarkLevelsKiwiTypedHelpersComplex_JSON(b *testing.B) {
buf := &bytes.Buffer{}
b.ResetTimer()
l := kiwi.New()
l.With("_n", "bench", "_p", pid)
l.WithTimestamp(time.RFC3339)
kiwi.LevelName = "l"
out := kiwi.SinkTo(buf, kiwi.UseJSON()).Start()
for i := 0; i < b.N; i++ {
l.AddPairs(kiwi.AsInt("key", 1), kiwi.AsStringer("obj", testObject)).Debug()
l.AddPairs(kiwi.AsInt("key", 1), kiwi.AsStringer("obj", testObject)).Info()
l.AddPairs(kiwi.AsInt("key", 1), kiwi.AsStringer("obj", testObject)).Warn()
l.AddPairs(kiwi.AsInt("key", 1), kiwi.AsStringer("obj", testObject)).Error()
}
b.StopTimer()
out.Close()
}
func BenchmarkLevelsKiwiComplex_JSON(b *testing.B) {
buf := &bytes.Buffer{}
b.ResetTimer()
l := kiwi.New()
l.With("_n", "bench", "_p", pid)
l.WithTimestamp(time.RFC3339)
kiwi.LevelName = "l"
out := kiwi.SinkTo(buf, kiwi.UseJSON()).Start()
for i := 0; i < b.N; i++ {
l.Debug("key", 1, "obj", testObject)
l.Info("key", 1, "obj", testObject)
l.Warn("key", 1, "obj", testObject)
l.Error("key", 1, "obj", testObject)
}
b.StopTimer()
out.Close()
}
func BenchmarkLevelsKiwi_JSON(b *testing.B) {
buf := &bytes.Buffer{}
b.ResetTimer()
l := kiwi.New()
l.With("_n", "bench", "_p", pid)
l.WithTimestamp(time.RFC3339)
kiwi.LevelName = "l"
out := kiwi.SinkTo(buf, kiwi.UseJSON()).Start()
for i := 0; i < b.N; i++ {
l.Debug("key", 1, "key2", 3.141592, "key3", "string", "key4", false)
l.Info("key", 1, "key2", 3.141592, "key3", "string", "key4", false)
l.Warn("key", 1, "key2", 3.141592, "key3", "string", "key4", false)
l.Error("key", 1, "key2", 3.141592, "key3", "string", "key4", false)
}
b.StopTimer()
out.Close()
}
func main() {
// Bind a new logger to a variable. You may create any number of loggers.
log := kiwi.New()
tmpFile, _ := os.Create("/tmp/something-completely-different.log")
// You can set arbitrary number of outputs.
// But they will remain unused until you explicitly start them with Start().
info := kiwi.SinkTo(os.Stdout, kiwi.UseLogfmt())
errors := kiwi.SinkTo(os.Stderr, kiwi.UseLogfmt())
something := kiwi.SinkTo(tmpFile, kiwi.UseLogfmt())
// Each record by default will copied to all outputs.
// But until you Start() any output the records will just dropped as the sample record below.
log.Add("just something that will lost")
// Each output allows filter out any records and write any other.
// You specify filter for the keys (key filter).
// Each of these keys should be presented in the record.
errors.WithKey("error", "msg")
// The filter may take into account key values. So only records with levels
// ERROR and FATAL will be passed filter and written to stderr.
errors.WithValue("level", "ERROR", "FATAL").Start()
// Vice versa you can filter out some keys.
info.WithoutKey("error")
// And define another set of key-val pairs for distinguish outputs.
info.WithValue("level", "INFO", "WARNING").Start()
// It will output all records from outputs above if they have key "something".
// So you can duplicate some records to several log files based on some criteria.
something.WithKey("something").Start()
// So if you not define any clauses (WithKey/WithoutKey/WithValue/WithoutValues)
// then all records will copied to an output.
// Let's go!
log.Add("level", "INFO", "sample-record", 1, "key", "value")
log.Add("level", "INFO", "sample-record", 2, "something").Log()
log.Add("level", "ERROR", "msg", "Error description.").Log()
log.Add("level", "FATAL").Log()
// Until you call Log() records not copied to outputs.
log.Log()
}
func main() {
// Bind a new logger to a variable. You may create any number of loggers.
log := kiwi.New()
// For starting write log records to some writer output should be initialized.
output := kiwi.SinkTo(os.Stdout, kiwi.UseLogfmt()).Start()
log.Add("sample-record", 1, "key", "value")
log.Log()
// Most logger and output operations support chaining.
log.Add("sample-record", 2, "key", "value", "key2", 123).Log()
// On pause output will drop any incoming records.
output.Stop()
log.Add("this record will be dropped because single output we declared is on pause")
output.Start()
// You can explicitly remove output but it will automatically closed on application exit.
output.Close()
}
func main() {
kiwi.SinkTo(os.Stdout, kiwi.UseLogfmt()).Start()
l := kiwi.New()
l.Add("sample-record", 1).Log()
}