foreign/node/src/wire/stream/get-stream.command.ts

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
//

import type { CommandResponse } from '../../client/client.type.js';
import { wrapCommand } from '../command.utils.js';
import { COMMAND_CODE } from '../command.code.js';
import { serializeIdentifier, type Id } from '../identifier.utils.js';
import { deserializeToStream, type Stream } from './stream.utils.js';

/**
 * Parameters for the get stream command.
 */
export type GetStream = {
  /** Stream identifier (ID or name) */
  streamId: Id
};

/**
 * Get stream command definition.
 * Retrieves a single stream by ID or name.
 */
export const GET_STREAM = {
  code: COMMAND_CODE.GetStream,

  serialize: ({ streamId }: GetStream) => {
    return serializeIdentifier(streamId);
  },

  deserialize: (r: CommandResponse) => {
    if(r.status === 0 && r.length === 0)
      return null;
    return deserializeToStream(r.data, 0).data
  }
}


/**
 * Executable get stream command function.
 */
export const getStream = wrapCommand<GetStream, Stream | null>(GET_STREAM);