forked from golang/glog
/
example_test.go
61 lines (48 loc) · 1.8 KB
/
example_test.go
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/*
Copyright 2022 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ktesting_test
import (
"errors"
"fmt"
"k8s.io/klog/v2/ktesting"
)
func ExampleUnderlier() {
logger := ktesting.NewLogger(ktesting.NopTL{}, ktesting.NewConfig())
logger.Error(errors.New("failure"), "I failed", "what", "something")
logger.WithValues("request", 1).V(1).Info("hello world")
logger.WithName("example").Info("with name")
underlier, ok := logger.GetSink().(ktesting.Underlier)
if !ok {
panic("Should have had a ktesting LogSink!?")
}
t := underlier.GetUnderlying()
t.Log("This goes to /dev/null...")
buffer := underlier.GetBuffer()
fmt.Printf("%s\n", buffer.String())
log := buffer.Data()
for i, entry := range log {
fmt.Printf("log entry #%d: %s %s %s %v err=%v\n", i, entry.Type, entry.Prefix, entry.Message, entry.KVList, entry.Err)
if i > 0 &&
entry.Timestamp.Sub(log[i-1].Timestamp).Nanoseconds() < 0 {
fmt.Printf("Unexpected timestamp order: #%d %s > #%d %s", i-1, log[i-1].Timestamp, i, entry.Timestamp)
}
}
// Output:
// ERROR I failed err="failure" what="something"
// INFO hello world request=1
// INFO example: with name
//
// log entry #0: ERROR I failed [what something] err=failure
// log entry #1: INFO hello world [request 1] err=<nil>
// log entry #2: INFO example with name [] err=<nil>
}