mirror of
https://github.com/ceph/ceph-csi.git
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77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
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/*
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Copyright 2018 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package log
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import (
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"sync"
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"github.com/go-logr/logr"
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)
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// KubeAPIWarningLoggerOptions controls the behavior
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// of a rest.WarningHandler constructed using NewKubeAPIWarningLogger().
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type KubeAPIWarningLoggerOptions struct {
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// Deduplicate indicates a given warning message should only be written once.
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// Setting this to true in a long-running process handling many warnings can
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// result in increased memory use.
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Deduplicate bool
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}
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// KubeAPIWarningLogger is a wrapper around
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// a provided logr.Logger that implements the
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// rest.WarningHandler interface.
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type KubeAPIWarningLogger struct {
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// logger is used to log responses with the warning header
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logger logr.Logger
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// opts contain options controlling warning output
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opts KubeAPIWarningLoggerOptions
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// writtenLock gurads written
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writtenLock sync.Mutex
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// used to keep track of already logged messages
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// and help in de-duplication.
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written map[string]struct{}
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}
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// HandleWarningHeader handles logging for responses from API server that are
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// warnings with code being 299 and uses a logr.Logger for it's logging purposes.
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func (l *KubeAPIWarningLogger) HandleWarningHeader(code int, agent string, message string) {
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if code != 299 || len(message) == 0 {
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return
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}
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if l.opts.Deduplicate {
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l.writtenLock.Lock()
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defer l.writtenLock.Unlock()
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if _, alreadyLogged := l.written[message]; alreadyLogged {
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return
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}
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l.written[message] = struct{}{}
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}
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l.logger.Info(message)
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}
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// NewKubeAPIWarningLogger returns an implementation of rest.WarningHandler that logs warnings
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// with code = 299 to the provided logr.Logger.
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func NewKubeAPIWarningLogger(l logr.Logger, opts KubeAPIWarningLoggerOptions) *KubeAPIWarningLogger {
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h := &KubeAPIWarningLogger{logger: l, opts: opts}
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if opts.Deduplicate {
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h.written = map[string]struct{}{}
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}
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return h
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}
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