DBus.Transport

Support for defining custom transport mechanisms. Most users will not need to care about the types defined in this module.

Transports

class Transport t where

A Transport can exchange bytes with a remote peer.

Associated Types

data TransportOptions t :: *

Additional options that this transport type may use when establishing a connection.

Methods

transportDefaultOptions :: TransportOptions t

Default values for this transport's options.

transportPut :: t -> ByteString -> IO ()

Send a ByteString over the transport.

Throws a TransportError if an error occurs.

transportGet :: t -> Int -> IO ByteString

Receive a ByteString of the given size from the transport. The transport should block until sufficient bytes are available, and only return fewer than the requested amount if there will not be any more data.

Throws a TransportError if an error occurs.

transportClose :: t -> IO ()

Close an open transport, and release any associated resources or handles.

Instances

Transport SocketTransport

Defined in DBus.Transport

Associated Types

data TransportOptions SocketTransport

Methods

transportDefaultOptions :: TransportOptions SocketTransport

transportPut :: SocketTransport -> ByteString -> IO ()

transportGet :: SocketTransport -> Int -> IO ByteString

transportClose :: SocketTransport -> IO ()

class Transport t => TransportOpen t where

A Transport which can open a connection to a remote peer.

Methods

transportOpen :: TransportOptions t -> Address -> IO t

Open a connection to the given address, using the given options.

Throws a TransportError if the connection could not be established.

Instances

TransportOpen SocketTransport

Defined in DBus.Transport

Methods

transportOpen :: TransportOptions SocketTransport -> Address -> IO SocketTransport

class Transport t => TransportListen t where

A Transport which can listen for and accept connections from remote peers.

Associated Types

data TransportListener t :: *

Used for transports that listen on a port or address.

Methods

transportListen :: TransportOptions t -> Address -> IO (TransportListener t)

Begin listening for connections on the given address, using the given options.

Throws a TransportError if it's not possible to listen at that address (for example, if the port is already in use).

transportAccept :: TransportListener t -> IO t

Accept a new connection.

Throws a TransportError if some error happens before the transport is ready to exchange bytes.

transportListenerClose :: TransportListener t -> IO ()

Close an open listener.

transportListenerAddress :: TransportListener t -> Address

Get the address to use to connect to a listener.

transportListenerUUID :: TransportListener t -> UUID

Get the UUID allocated to this transport listener.

See randomUUID.

Instances

TransportListen SocketTransport

Defined in DBus.Transport

Associated Types

data TransportListener SocketTransport

Methods

transportListen :: TransportOptions SocketTransport -> Address -> IO (TransportListener SocketTransport)

transportAccept :: TransportListener SocketTransport -> IO SocketTransport

transportListenerClose :: TransportListener SocketTransport -> IO ()

transportListenerAddress :: TransportListener SocketTransport -> Address

transportListenerUUID :: TransportListener SocketTransport -> UUID

Transport errors

data TransportError

Thrown from transport methods when an error occurs.

Instances

Exception TransportError

Defined in DBus.Transport

Methods

toException :: TransportError -> SomeException

fromException :: SomeException -> Maybe TransportError

displayException :: TransportError -> String

Show TransportError

Defined in DBus.Transport

Methods

showsPrec :: Int -> TransportError -> ShowS

show :: TransportError -> String

showList :: [TransportError] -> ShowS

Eq TransportError

Defined in DBus.Transport

Methods

(==) :: TransportError -> TransportError -> Bool

(/=) :: TransportError -> TransportError -> Bool

transportError :: String -> TransportError

transportErrorMessage :: TransportError -> String

transportErrorAddress :: TransportError -> Maybe Address

Socket transport

data SocketTransport

Supports connecting over Unix or TCP sockets.

Unix sockets are similar to pipes, but exist as special files in the filesystem. On Linux, abstract sockets have a path-like address, but do not actually have entries in the filesystem.

TCP sockets may use either IPv4 or IPv6.

Instances

Transport SocketTransport

Defined in DBus.Transport

Associated Types

data TransportOptions SocketTransport

Methods

transportDefaultOptions :: TransportOptions SocketTransport

transportPut :: SocketTransport -> ByteString -> IO ()

transportGet :: SocketTransport -> Int -> IO ByteString

transportClose :: SocketTransport -> IO ()

TransportListen SocketTransport

Defined in DBus.Transport

Associated Types

data TransportListener SocketTransport

Methods

transportListen :: TransportOptions SocketTransport -> Address -> IO (TransportListener SocketTransport)

transportAccept :: TransportListener SocketTransport -> IO SocketTransport

transportListenerClose :: TransportListener SocketTransport -> IO ()

transportListenerAddress :: TransportListener SocketTransport -> Address

transportListenerUUID :: TransportListener SocketTransport -> UUID

TransportOpen SocketTransport

Defined in DBus.Transport

Methods

transportOpen :: TransportOptions SocketTransport -> Address -> IO SocketTransport

data TransportListener SocketTransport

Defined in DBus.Transport

data TransportListener SocketTransport = SocketTransportListener Address UUID Socket

data TransportOptions SocketTransport

Defined in DBus.Transport

data TransportOptions SocketTransport = SocketTransportOptions {

• socketTransportOptionBacklog :: Int

}

socketTransportCredentials :: SocketTransport -> IO (Maybe CUInt, Maybe CUInt, Maybe CUInt)

Returns the processID, userID, and groupID of the socket's peer.

See getPeerCredential.