1 /* 2 * Copyright 2021 Google Inc. All rights reserved. 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 public protocol FlatBufferGRPCMessage { 18 19 /// Raw pointer which would be pointing to the beginning of the readable bytes 20 var rawPointer: UnsafeMutableRawPointer { get } 21 22 /// Size of readable bytes in the buffer 23 var size: Int { get } 24 25 init(byteBuffer: ByteBuffer) 26 } 27 28 /// Message is a wrapper around Buffers to to able to send Flatbuffers `Buffers` through the 29 /// GRPC library 30 public struct Message<T: FlatBufferObject>: FlatBufferGRPCMessage { 31 internal var buffer: ByteBuffer 32 33 /// Returns the an object of type T that would be read from the buffer 34 public var object: T { 35 T.init( 36 buffer, 37 o: Int32(buffer.read(def: UOffset.self, position: buffer.reader)) + Int32(buffer.reader)) 38 } 39 40 public var rawPointer: UnsafeMutableRawPointer { buffer.memory.advanced(by: buffer.reader) } 41 42 public var size: Int { Int(buffer.size) } 43 44 /// Initializes the message with the type Flatbuffer.Bytebuffer that is transmitted over 45 /// GRPC 46 /// - Parameter byteBuffer: Flatbuffer ByteBuffer object 47 public init(byteBuffer: ByteBuffer) { 48 buffer = byteBuffer 49 } 50 51 /// Initializes the message by copying the buffer to the message to be sent. 52 /// from the builder 53 /// - Parameter builder: FlatbufferBuilder that has the bytes created in 54 /// - Note: Use `builder.finish(offset)` before passing the builder without prefixing anything to it 55 public init(builder: inout FlatBufferBuilder) { 56 buffer = builder.sizedBuffer 57 builder.clear() 58 } 59 } 60