CODEWITHSUNDEEP
swiftswift-nio
Lupurus
Lupurus

Reputation: 4209

SwiftNIO: connect is not working if the code is in a class

I just started with SwiftNIO and I used this code for the first try:

let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
let bootstrap = ClientBootstrap(group: group)
    // Enable SO_REUSEADDR.
    .channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEADDR), value: 1)
defer {
    try? group.syncShutdownGracefully()
}

do {
    let channel = try bootstrap.connect(host: "127.0.0.1", port: 1234).wait()
    try channel.closeFuture.wait()
} catch let error {
    print(error)
}

It works and I get printed an error, because my server is not running.

But if I bring that code to a class, nothing happens:

class Client {

    let bootstrap: ClientBootstrap

    init() {
        let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
        self.bootstrap = ClientBootstrap(group: group)
            // Enable SO_REUSEADDR.
            .channelOption(ChannelOptions.socket(SocketOptionLevel(SOL_SOCKET), SO_REUSEADDR), value: 1)
        defer {
            try? group.syncShutdownGracefully()
        }
    }

    func connect(host: String, port: Int) throws {
        let channel = try self.bootstrap.connect(host: host, port: port).wait()
        try channel.closeFuture.wait()
    }
}

let client = Client()
do {
    try client.connect(host: "127.0.0.1", port: 1234)
} catch let error {
    print(error)
}

What am I doing wrong?

Upvotes: 0

Views: 354

Answers (1)

jrturton
jrturton

Reputation: 119262

In what context is the original code running? It's unusual to see a defer in an init method, particularly right at the end - it will be executed as soon as init is finished, whereas the defer in your original code will be executed after the do / catch block is performed.

You probably want the shutdown code to be in the deinit method of your Client class.

Upvotes: 0

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