github.com/cloudwego/kitex@v0.9.0/pkg/remote/trans_meta.go (about)

     1  /*
     2   * Copyright 2021 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package remote
    18  
    19  import (
    20  	"context"
    21  )
    22  
    23  // MetaHandler reads or writes metadata through certain protocol.
    24  type MetaHandler interface {
    25  	WriteMeta(ctx context.Context, msg Message) (context.Context, error)
    26  	ReadMeta(ctx context.Context, msg Message) (context.Context, error)
    27  }
    28  
    29  // StreamingMetaHandler reads or writes metadata through streaming header(http2 header)
    30  type StreamingMetaHandler interface {
    31  	// writes metadata before create a stream
    32  	OnConnectStream(ctx context.Context) (context.Context, error)
    33  	// reads metadata before read first message from stream
    34  	OnReadStream(ctx context.Context) (context.Context, error)
    35  }