s3 cache client-side support

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/aws/smithy-go/middleware/logging.go

@@ -0,0 +1,46 @@
+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)
+}