52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package zlog
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import (
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"context"
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)
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var disabledLogger *Logger
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func init() {
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SetGlobalLevel(TraceLevel)
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l := Nop()
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disabledLogger = &l
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}
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type ctxKey struct{}
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// WithContext returns a copy of ctx with l associated. If an instance of Logger
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// is already in the context, the context is not updated.
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//
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// For instance, to add a field to an existing logger in the context, use this
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// notation:
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//
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// ctx := r.Context()
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// l := zlog.Ctx(ctx)
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// l.UpdateContext(func(c Context) Context {
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// return c.Str("bar", "baz")
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// })
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func (l Logger) WithContext(ctx context.Context) context.Context {
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if lp, ok := ctx.Value(ctxKey{}).(*Logger); ok {
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if lp == &l {
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// Do not store same logger.
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return ctx
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}
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} else if l.level == Disabled {
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// Do not store disabled logger.
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return ctx
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}
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return context.WithValue(ctx, ctxKey{}, &l)
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}
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// Ctx returns the Logger associated with the ctx. If no logger
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// is associated, DefaultContextLogger is returned, unless DefaultContextLogger
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// is nil, in which case a disabled logger is returned.
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func Ctx(ctx context.Context) *Logger {
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if l, ok := ctx.Value(ctxKey{}).(*Logger); ok {
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return l
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} else if l = DefaultContextLogger; l != nil {
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return l
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}
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return disabledLogger
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}
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