twisted.pair.testing

Class	`MemoryIOSystem`	An in-memory implementation of basic I/O primitives, useful in the context of unit testing as a drop-in replacement for parts of the `os` module.
Class	`Tunnel`	An in-memory implementation of a tun or tap device.
Class	`_FakePort`	A socket-like object which can be used to read UDP datagrams from tunnel-like file descriptors managed by a `MemoryIOSystem`.
Function	`_ethernet`	Construct an ethernet frame.
Function	`_H`	Pack an integer into a network-order two-byte string.
Function	`_ip`	Construct an IP datagram with the given source, destination, and application payload.
Function	`_privileged`	No summary
Function	`_udp`	Construct a UDP datagram with the given source, destination, and application payload.
Constant	`_PI_SIZE`	Undocumented
Variable	`_IPv4`	Undocumented

def _ethernet(src, dst, protocol, payload): (source)

Construct an ethernet frame.

Parameters
src:`bytes`	The source ethernet address, encoded.
dst:`bytes`	The destination ethernet address, encoded.
protocol:`int`	The protocol number of the payload of this datagram.
payload:`bytes`	The content of the ethernet frame (such as an IP datagram).
Returns
`bytes`	The full ethernet frame.

def _H(n): (source)

Pack an integer into a network-order two-byte string.

Parameters
n	The integer to pack. Only values that fit into 16 bits are supported.
Returns
`bytes`	The packed representation of the integer.

def _ip(src, dst, payload): (source)

Construct an IP datagram with the given source, destination, and application payload.

Parameters
src:`bytes`	The source IPv4 address as a dotted-quad string.
dst:`bytes`	The destination IPv4 address as a dotted-quad string.
payload:`bytes`	The content of the IP datagram (such as a UDP datagram).
Returns
`bytes`	An IP datagram header and payload.

def _privileged(original): (source)

Wrap a MemoryIOSystem method with permission-checking logic. The returned function will check self.permissions and raise IOError with errno.EPERM if the function name is not listed as an available permission.

Parameters
original	The `MemoryIOSystem` instance to wrap.
Returns
A wrapper around `original` that applies permission checks.

def _udp(src, dst, payload): (source)

Construct a UDP datagram with the given source, destination, and application payload.

Parameters
src:`int`	The source port number.
dst:`int`	The destination port number.
payload:`bytes`	The content of the UDP datagram.
Returns
`bytes`	A UDP datagram header and payload.

_PI_SIZE: int = (source)

Undocumented

Value

_IPv4: int = (source)

Undocumented