mirror of
https://github.com/ceph/ceph-csi.git
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136 lines
4.1 KiB
Go
136 lines
4.1 KiB
Go
/*
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Copyright 2020 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 v1
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import (
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"fmt"
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"sort"
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"strings"
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"sync"
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"github.com/go-logr/logr"
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"k8s.io/component-base/featuregate"
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)
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var logRegistry = newLogFormatRegistry()
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// logFormatRegistry stores factories for all supported logging formats.
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type logFormatRegistry struct {
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mutex sync.Mutex
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registry map[string]logFormat
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frozen bool
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}
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type logFormat struct {
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factory LogFormatFactory
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feature featuregate.Feature
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}
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// +k8s:deepcopy-gen=false
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// RuntimeControl provides operations that aren't available through the normal
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// Logger or LogSink API.
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type RuntimeControl struct {
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// Flush ensures that all in-memory data is written.
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// May be nil.
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Flush func()
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// SetVerbosityLevel changes the level for all Logger instances
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// derived from the initial one. May be nil.
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//
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// The parameter is intentionally a plain uint32 instead of
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// VerbosityLevel to enable implementations that don't need to import
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// the API (helps avoid circular dependencies).
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SetVerbosityLevel func(v uint32) error
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}
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// LogFormatFactory provides support for a certain additional,
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// non-default log format.
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type LogFormatFactory interface {
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// Create returns a logger with the requested configuration.
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Create(c LoggingConfiguration, o LoggingOptions) (logr.Logger, RuntimeControl)
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}
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// RegisterLogFormat registers support for a new logging format. This must be called
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// before using any of the methods in LoggingConfiguration. The feature must
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// be one of those defined in this package (typically LoggingAlphaOptions,
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// LoggingBetaOptions or LoggingStableOptions).
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func RegisterLogFormat(name string, factory LogFormatFactory, feature featuregate.Feature) error {
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return logRegistry.register(name, logFormat{factory, feature})
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}
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func newLogFormatRegistry() *logFormatRegistry {
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registry := &logFormatRegistry{
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registry: make(map[string]logFormat),
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frozen: false,
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}
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_ = registry.register(DefaultLogFormat, logFormat{factory: textFactory{}, feature: LoggingStableOptions})
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return registry
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}
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// register adds a new log format. It's an error to modify an existing one.
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func (lfr *logFormatRegistry) register(name string, format logFormat) error {
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lfr.mutex.Lock()
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defer lfr.mutex.Unlock()
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if lfr.frozen {
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return fmt.Errorf("log format registry is frozen, unable to register log format %s", name)
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}
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if _, ok := lfr.registry[name]; ok {
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return fmt.Errorf("log format: %s already exists", name)
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}
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if _, ok := featureGates()[format.feature]; !ok && format.feature != LoggingStableOptions {
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return fmt.Errorf("log format %s: unsupported feature gate %s", name, format.feature)
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}
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lfr.registry[name] = format
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return nil
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}
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// get specified log format factory
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func (lfr *logFormatRegistry) get(name string) (*logFormat, error) {
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lfr.mutex.Lock()
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defer lfr.mutex.Unlock()
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format, ok := lfr.registry[name]
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if !ok {
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return nil, fmt.Errorf("log format: %s does not exists", name)
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}
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return &format, nil
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}
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// list names of registered log formats, including feature gates (sorted)
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func (lfr *logFormatRegistry) list() string {
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lfr.mutex.Lock()
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defer lfr.mutex.Unlock()
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formats := make([]string, 0, len(lfr.registry))
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for name, format := range lfr.registry {
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item := fmt.Sprintf(`"%s"`, name)
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if format.feature != LoggingStableOptions {
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item += fmt.Sprintf(" (gated by %s)", format.feature)
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}
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formats = append(formats, item)
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}
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sort.Strings(formats)
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return strings.Join(formats, ", ")
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}
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// freeze prevents further modifications of the registered log formats.
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func (lfr *logFormatRegistry) freeze() {
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lfr.mutex.Lock()
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defer lfr.mutex.Unlock()
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lfr.frozen = true
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}
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