39 lines
1.2 KiB
Go
39 lines
1.2 KiB
Go
package hclog
|
|
|
|
import (
|
|
"context"
|
|
)
|
|
|
|
// WithContext inserts a logger into the context and is retrievable
|
|
// with FromContext. The optional args can be set with the same syntax as
|
|
// Logger.With to set fields on the inserted logger. This will not modify
|
|
// the logger argument in-place.
|
|
func WithContext(ctx context.Context, logger Logger, args ...interface{}) context.Context {
|
|
// While we could call logger.With even with zero args, we have this
|
|
// check to avoid unnecessary allocations around creating a copy of a
|
|
// logger.
|
|
if len(args) > 0 {
|
|
logger = logger.With(args...)
|
|
}
|
|
|
|
return context.WithValue(ctx, contextKey, logger)
|
|
}
|
|
|
|
// FromContext returns a logger from the context. This will return L()
|
|
// (the default logger) if no logger is found in the context. Therefore,
|
|
// this will never return a nil value.
|
|
func FromContext(ctx context.Context) Logger {
|
|
logger, _ := ctx.Value(contextKey).(Logger)
|
|
if logger == nil {
|
|
return L()
|
|
}
|
|
|
|
return logger
|
|
}
|
|
|
|
// Unexported new type so that our context key never collides with another.
|
|
type contextKeyType struct{}
|
|
|
|
// contextKey is the key used for the context to store the logger.
|
|
var contextKey = contextKeyType{}
|