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trans_meta.go
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trans_meta.go
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/*
* 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)
}