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65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package hclog
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import (
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"sync"
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"time"
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)
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var (
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protect sync.Once
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def Logger
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// DefaultOptions is used to create the Default logger. These are read
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// only when the Default logger is created, so set them as soon as the
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// process starts.
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DefaultOptions = &LoggerOptions{
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Level: DefaultLevel,
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Output: DefaultOutput,
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TimeFn: time.Now,
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}
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)
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// Default returns a globally held logger. This can be a good starting
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// place, and then you can use .With() and .Named() to create sub-loggers
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// to be used in more specific contexts.
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// The value of the Default logger can be set via SetDefault() or by
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// changing the options in DefaultOptions.
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//
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// This method is goroutine safe, returning a global from memory, but
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// care should be used if SetDefault() is called it random times
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// in the program as that may result in race conditions and an unexpected
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// Logger being returned.
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func Default() Logger {
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protect.Do(func() {
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// If SetDefault was used before Default() was called, we need to
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// detect that here.
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if def == nil {
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def = New(DefaultOptions)
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}
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})
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return def
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}
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// L is a short alias for Default().
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func L() Logger {
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return Default()
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}
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// SetDefault changes the logger to be returned by Default()and L()
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// to the one given. This allows packages to use the default logger
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// and have higher level packages change it to match the execution
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// environment. It returns any old default if there is one.
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//
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// NOTE: This is expected to be called early in the program to setup
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// a default logger. As such, it does not attempt to make itself
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// not racy with regard to the value of the default logger. Ergo
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// if it is called in goroutines, you may experience race conditions
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// with other goroutines retrieving the default logger. Basically,
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// don't do that.
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func SetDefault(log Logger) Logger {
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old := def
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def = log
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return old
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}
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