/*
 * Copyright 2021 CloudWeGo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package remote

import (
	"context"
)

// MetaHandler reads or writes metadata through certain protocol.
type MetaHandler interface {
	WriteMeta(ctx context.Context, msg Message) (context.Context, error)
	ReadMeta(ctx context.Context, msg Message) (context.Context, error)
}

// StreamingMetaHandler reads or writes metadata through streaming header(http2 header)
type StreamingMetaHandler interface {
	// writes metadata before create a stream
	OnConnectStream(ctx context.Context) (context.Context, error)
	// reads metadata before read first message from stream
	OnReadStream(ctx context.Context) (context.Context, error)
}
