Listening on a socket and waiting for request

SwiftServer-Loop.swift

while(true) {

    // 5: Wait for a request

    let fd = accept(sock, nil, nil)

    print("Connection made")

    guard fd >= 0 else {
        print("Can't accept connection")
        continue // goes back to waiting
    }
    
    // 6: Parse and route the request

    guard let request = Request(fd) else {
        continue
    }
    
    let responseBody: String?
    try {
        responseBody = routeRequest(request)
    } catch {
        print(error)
        if let (errorBody, statusCode) = handleError(error) {
            let response = httpResponse(body: errorBody, status: statusCode)
            write(fd, response)
            close(fd)
        }
        continue
    }

    // 7: Write the response (if any) to the socket
    if let responseBody = responseBody {
        let response: String = httpResponse(body: responseBody, status: 200)
        write(fd, response)
    }

    // 8: Close the request

    close(fd)
}