mug

Types

ConnectionOptions

pub type ConnectionOptions {
  ConnectionOptions(host: String, port: Int, timeout: Int)
}

Constructors

```
ConnectionOptions(host: String, port: Int, timeout: Int)
```
Arguments
- host
  
  The hostname of the server to connect to.
- port
  
  The port of the server to connect to.
- timeout
  
  A timeout in milliseconds for the connection to be established.
  
  Note that if the operating system returns a timeout then this package will also return a timeout, even if this timeout value has not been reached yet.

Error

</>

Errors that can occur when working with TCP sockets.

For more information on these errors see the Erlang documentation:

https://www.erlang.org/doc/man/file#type-posix
https://www.erlang.org/doc/man/inet#type-posix

pub type Error {
  Closed
  Timeout
  Eaddrinuse
  Eaddrnotavail
  Eafnosupport
  Ealready
  Econnaborted
  Econnrefused
  Econnreset
  Edestaddrreq
  Ehostdown
  Ehostunreach
  Einprogress
  Eisconn
  Emsgsize
  Enetdown
  Enetunreach
  Enopkg
  Enoprotoopt
  Enotconn
  Enotty
  Enotsock
  Eproto
  Eprotonosupport
  Eprototype
  Esocktnosupport
  Etimedout
  Ewouldblock
  Exbadport
  Exbadseq
  Nxdomain
  Eacces
  Eagain
  Ebadf
  Ebadmsg
  Ebusy
  Edeadlk
  Edeadlock
  Edquot
  Eexist
  Efault
  Efbig
  Eftype
  Eintr
  Einval
  Eio
  Eisdir
  Eloop
  Emfile
  Emlink
  Emultihop
  Enametoolong
  Enfile
  Enobufs
  Enodev
  Enolck
  Enolink
  Enoent
  Enomem
  Enospc
  Enosr
  Enostr
  Enosys
  Enotblk
  Enotdir
  Enotsup
  Enxio
  Eopnotsupp
  Eoverflow
  Eperm
  Epipe
  Erange
  Erofs
  Espipe
  Esrch
  Estale
  Etxtbsy
  Exdev
}

Constructors

```
Closed
```
```
Timeout
```
```
Eaddrinuse
```
```
Eaddrnotavail
```
```
Eafnosupport
```
```
Ealready
```
```
Econnaborted
```
```
Econnrefused
```
```
Econnreset
```
```
Edestaddrreq
```
```
Ehostdown
```
```
Ehostunreach
```
```
Einprogress
```
```
Eisconn
```
```
Emsgsize
```
```
Enetdown
```
```
Enetunreach
```
```
Enopkg
```
```
Enoprotoopt
```
```
Enotconn
```
```
Enotty
```
```
Enotsock
```
```
Eproto
```
```
Eprotonosupport
```
```
Eprototype
```
```
Esocktnosupport
```
```
Etimedout
```
```
Ewouldblock
```
```
Exbadport
```
```
Exbadseq
```
```
Nxdomain
```
```
Eacces
```
```
Eagain
```
```
Ebadf
```
```
Ebadmsg
```
```
Ebusy
```
```
Edeadlk
```
```
Edeadlock
```
```
Edquot
```
```
Eexist
```
```
Efault
```
```
Efbig
```
```
Eftype
```
```
Eintr
```
```
Einval
```
```
Eio
```
```
Eisdir
```
```
Eloop
```
```
Emfile
```
```
Emlink
```
```
Emultihop
```
```
Enametoolong
```
```
Enfile
```
```
Enobufs
```
```
Enodev
```
```
Enolck
```
```
Enolink
```
```
Enoent
```
```
Enomem
```
```
Enospc
```
```
Enosr
```
```
Enostr
```
```
Enosys
```
```
Enotblk
```
```
Enotdir
```
```
Enotsup
```
```
Enxio
```
```
Eopnotsupp
```
```
Eoverflow
```
```
Eperm
```
```
Epipe
```
```
Erange
```
```
Erofs
```
```
Espipe
```
```
Esrch
```
```
Estale
```
```
Etxtbsy
```
```
Exdev
```

Socket

</>

pub type Socket

TcpMessage

</>

Messages that can be sent by the socket to the process that controls it.

pub type TcpMessage {
  Packet(Socket, BitArray)
  SocketClosed(Socket)
  TcpError(Socket, Error)
}

Constructors

```
Packet(Socket, BitArray)
```
A packet has been received from the client.
```
SocketClosed(Socket)
```
The socket has been closed by the client.
```
TcpError(Socket, Error)
```
An error has occurred on the socket.

Functions

connect

</>

pub fn connect(
  options: ConnectionOptions,
) -> Result(Socket, Error)

Establish a TCP connection to the server specified in the connection options.

Returns an error if the connection could not be established.

The socket is created in passive mode, meaning the the receive function is to be called to receive packets from the client. The receive_next_packet_as_message function can be used to switch the socket to active mode and receive the next packet as an Erlang message.

new

</>

pub fn new(host: String, port port: Int) -> ConnectionOptions

Create a new set of connection options.

receive

</>

pub fn receive(
  socket: Socket,
  timeout_milliseconds timeout: Int,
) -> Result(BitArray, Error)

Receive a packet from the client.

Errors if the socket is closed, if the timeout is reached, or if there is some other problem receiving the packet.

receive_exact

</>

pub fn receive_exact(
  socket: Socket,
  byte_size size: Int,
  timeout_milliseconds timeout: Int,
) -> Result(BitArray, Error)

Receive the specified number of bytes from the client, unless the socket was closed, from the other side. In that case, the last read may return less bytes. If the specified number of bytes is not available to read from the socket then the function will block until the bytes are available, or until the timeout is reached. This directly calls the underlying Erlang function gen_tcp:recv/3.

Errors if the socket is closed, if the timeout is reached, or if there is some other problem receiving the packet.

receive_next_packet_as_message

</>

pub fn receive_next_packet_as_message(socket: Socket) -> Nil

Switch the socket to active mode, meaning that the next packet received on the socket will be sent as an Erlang message to the socket owner’s inbox.

This is useful for when you wish to have an OTP actor handle incoming messages as using the receive function would result in the actor being blocked and unable to handle other messages while waiting for the next packet.

Messages will be send to the process that controls the socket, which is the process that established the socket with the connect function.

selecting_tcp_messages

</>

pub fn selecting_tcp_messages(
  selector: Selector(a),
  mapper: fn(TcpMessage) -> a,
) -> Selector(a)

Configure a selector to receive messages from TCP sockets.

Note this will receive messages from all TCP sockets that the process controls, rather than any specific one. If you wish to only handle messages from one socket then use one process per socket.

send

</>

pub fn send(
  socket: Socket,
  packet: BitArray,
) -> Result(Nil, Error)

Send a packet to the client.

send_builder

</>

pub fn send_builder(
  socket: Socket,
  packet: BytesTree,
) -> Result(Nil, Error)

Send a packet to the client, the data in BytesBuilder. Using this function is more efficient turning an BytesBuilder or a StringBuilder into a BitArray to use with the send function.

shutdown

</>

pub fn shutdown(socket: Socket) -> Result(Nil, Error)

Close the socket, ensuring that any data buffered in the socket is flushed to the operating system kernel socket first.

timeout

</>

pub fn timeout(
  options: ConnectionOptions,
  milliseconds timeout: Int,
) -> ConnectionOptions

Specify a timeout for the connection to be established.

Constructors

Arguments

Constructors

Constructors