| /* |
| * 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. |
| */ |
| |
| /** |
| * @author Igor Ostapenko |
| */ |
| |
| import { Buffer } from 'buffer'; |
| |
| /** |
| * GraphBinary reader. |
| */ |
| export default class GraphBinaryReader { |
| constructor(ioc) { |
| this.ioc = ioc; |
| } |
| |
| readResponse(buffer) { |
| if (buffer === undefined || buffer === null) { |
| throw new Error('Buffer is missing.'); |
| } |
| if (!(buffer instanceof Buffer)) { |
| throw new Error('Not an instance of Buffer.'); |
| } |
| if (buffer.length < 1) { |
| throw new Error('Buffer is empty.'); |
| } |
| |
| const response = { status: {}, result: {} }; |
| let cursor = buffer; |
| let len; |
| |
| // {version} is a Byte representing the protocol version |
| const version = cursor[0]; |
| if (version !== 0x81) { |
| throw new Error(`Unsupported version '${version}'.`); |
| } |
| cursor = cursor.slice(1); // skip version |
| |
| // {request_id} is a nullable UUID |
| ({ v: response.requestId, len } = this.ioc.uuidSerializer.deserialize(cursor, false, true)); |
| cursor = cursor.slice(len); |
| |
| // {status_code} is an Int |
| ({ v: response.status.code, len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| cursor = cursor.slice(len); |
| |
| // {status_message} is a nullable String |
| ({ v: response.status.message, len } = this.ioc.stringSerializer.deserialize(cursor, false, true)); |
| cursor = cursor.slice(len); |
| |
| // {status_attributes} is a Map |
| ({ v: response.status.attributes, len } = this.ioc.mapSerializer.deserialize(cursor, false)); |
| cursor = cursor.slice(len); |
| |
| // {result_meta} is a Map |
| ({ v: response.result.meta, len } = this.ioc.mapSerializer.deserialize(cursor, false)); |
| cursor = cursor.slice(len); |
| |
| // {result_data} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} |
| ({ v: response.result.data } = this.ioc.anySerializer.deserialize(cursor)); |
| |
| return response; |
| } |
| } |