logging.go•1.51 kB
package middleware
import (
"context"
"github.com/aws/smithy-go/logging"
)
// loggerKey is the context value key for which the logger is associated with.
type loggerKey struct{}
// GetLogger takes a context to retrieve a Logger from. If no logger is present on the context a logging.Nop logger
// is returned. If the logger retrieved from context supports the ContextLogger interface, the context will be passed
// to the WithContext method and the resulting logger will be returned. Otherwise the stored logger is returned as is.
func GetLogger(ctx context.Context) logging.Logger {
logger, ok := ctx.Value(loggerKey{}).(logging.Logger)
if !ok || logger == nil {
return logging.Nop{}
}
return logging.WithContext(ctx, logger)
}
// SetLogger sets the provided logger value on the provided ctx.
func SetLogger(ctx context.Context, logger logging.Logger) context.Context {
return context.WithValue(ctx, loggerKey{}, logger)
}
type setLogger struct {
Logger logging.Logger
}
// AddSetLoggerMiddleware adds a middleware that will add the provided logger to the middleware context.
func AddSetLoggerMiddleware(stack *Stack, logger logging.Logger) error {
return stack.Initialize.Add(&setLogger{Logger: logger}, After)
}
func (a *setLogger) ID() string {
return "SetLogger"
}
func (a *setLogger) HandleInitialize(ctx context.Context, in InitializeInput, next InitializeHandler) (
out InitializeOutput, metadata Metadata, err error,
) {
return next.HandleInitialize(SetLogger(ctx, a.Logger), in)
}