Not working with Venice

[Dev1an]

When I call socket.receiveString() in a Venice Coroutine, the app blocks inside the coroutine.

Example When I run the following code, it prints running coroutine and then blocks.

import ZeroMQ
import Venice

let context = try Context()

let inbound = try context.socket(.Pull)
try inbound.bind("tcp://127.0.0.1:5555")

co {
    print("running coroutine")
    do {
        while let data = try inbound.receiveString() where data != "Bye!" {
            print(data)
        }
    } catch {
        print("An error occured")
    }
}

print("sending messages outside the coroutine")

let outbound = try context.socket(.Push)
try outbound.connect("tcp://127.0.0.1:5555")

try outbound.sendString("Hello World!")
try outbound.sendString("Bye!")

Am I using Venice wrong or is this a bug?

[goloveychuk]

@Dev1an Because in example above it don't used venice polling. So it's blocks a thread. To avoid this you should use Venice.poll E.g.

public class ZmqConnection {
    let socket: ZeroMQ.Socket
    let address: String
    var polled: Venice.PollEvent? = nil
    var fd: Int32 {
        return try! socket.getFileDescriptor()
    }
    init(address: String, type: SocketType) {
        self.address = address
        socket = try! context.socket(type)
    }
    public func connect() throws {
        try socket.connect(address)
    }
    func read() -> [Data]? {
        if polled == nil {
            polled = try! Venice.poll(fd, for: .reading)
            guard polled!.contains(.reading) else {
                return nil
            }
        }
        let events = try! socket.getEvents()!
        if events.contains(.In) {
            var msg_parts: [Data] = []
            while true {
                guard let array = try! socket.receive() else {
                    break
                }
                msg_parts.append(array)
                if !(try! socket.getReceiveMore()) {
                    break
                }
            }
            return msg_parts
        } else {
            polled = nil
            return nil
        }

    }
}

But I'm not sure it's works 100%