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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import NIO
print("Please enter line to send to the server")
let line = readLine(strippingNewline: true)!
private final class EchoHandler: ChannelInboundHandler {
public typealias InboundIn = ByteBuffer
public typealias OutboundOut = ByteBuffer
private var numBytes = 0
public func channelActive(context: ChannelHandlerContext) {
print("Client connected to \(context.remoteAddress!)")
// We are connected. It's time to send the message to the server to initialize the ping-pong sequence.
let buffer = context.channel.allocator.buffer(string: line)
self.numBytes = buffer.readableBytes
context.writeAndFlush(self.wrapOutboundOut(buffer), promise: nil)
}
public func channelRead(context: ChannelHandlerContext, data: NIOAny) {
let byteBuffer = self.unwrapInboundIn(data)
self.numBytes -= byteBuffer.readableBytes
if self.numBytes == 0 {
let string = String(buffer: byteBuffer)
print("Received: '\(string)' back from the server, closing channel.")
context.close(promise: nil)
}
}
public func errorCaught(context: ChannelHandlerContext, error: Error) {
print("error: ", error)
// As we are not really interested getting notified on success or failure we just pass nil as promise to
// reduce allocations.
context.close(promise: nil)
}
}
let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
let bootstrap = ClientBootstrap(group: group)
// Enable SO_REUSEADDR.
.channelOption(ChannelOptions.socketOption(.so_reuseaddr), value: 1)
.channelInitializer { channel in
channel.pipeline.addHandler(EchoHandler())
}
defer {
try! group.syncShutdownGracefully()
}
// First argument is the program path
let arguments = CommandLine.arguments
let arg1 = arguments.dropFirst().first
let arg2 = arguments.dropFirst(2).first
let defaultHost = "::1"
let defaultPort: Int = 9999
enum ConnectTo {
case ip(host: String, port: Int)
case unixDomainSocket(path: String)
}
let connectTarget: ConnectTo
switch (arg1, arg1.flatMap(Int.init), arg2.flatMap(Int.init)) {
case (.some(let h), _ , .some(let p)):
/* we got two arguments, let's interpret that as host and port */
connectTarget = .ip(host: h, port: p)
case (.some(let portString), .none, _):
/* couldn't parse as number, expecting unix domain socket path */
connectTarget = .unixDomainSocket(path: portString)
case (_, .some(let p), _):
/* only one argument --> port */
connectTarget = .ip(host: defaultHost, port: p)
default:
connectTarget = .ip(host: defaultHost, port: defaultPort)
}
let channel = try { () -> Channel in
switch connectTarget {
case .ip(let host, let port):
return try bootstrap.connect(host: host, port: port).wait()
case .unixDomainSocket(let path):
return try bootstrap.connect(unixDomainSocketPath: path).wait()
}
}()
// Will be closed after we echo-ed back to the server.
try channel.closeFuture.wait()
print("Client closed")
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