micro/logger/context.go

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package logger
import "context"
type loggerKey struct{}
// MustContext returns logger from passed context or DefaultLogger if empty
func MustContext(ctx context.Context) Logger {
if ctx == nil {
return DefaultLogger
}
if l, ok := ctx.Value(loggerKey{}).(Logger); ok && l != nil {
return l
}
return DefaultLogger
}
// FromContext returns logger from passed context
func FromContext(ctx context.Context) (Logger, bool) {
if ctx == nil {
return nil, false
}
l, ok := ctx.Value(loggerKey{}).(Logger)
return l, ok
}
// NewContext stores logger into passed context
func NewContext(ctx context.Context, l Logger) context.Context {
if ctx == nil {
ctx = context.Background()
}
return context.WithValue(ctx, loggerKey{}, l)
}
// SetOption returns a function to setup a context with given value
func SetOption(k, v interface{}) Option {
return func(o *Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, k, v)
}
}