twisted.application.internet : API documentation

Reactor-based Services

Here are services to run clients, servers and periodic services using the reactor.

If you want to run a server service, StreamServerEndpointService defines a service that can wrap an arbitrary IStreamServerEndpoint as an IService. See also twisted.application.strports.service for constructing one of these directly from a descriptive string.

Additionally, this module (dynamically) defines various Service subclasses that let you represent clients and servers in a Service hierarchy. Endpoints APIs should be preferred for stream server services, but since those APIs do not yet exist for clients or datagram services, many of these are still useful.

They are as follows:

 TCPServer, TCPClient,
 UNIXServer, UNIXClient,
 SSLServer, SSLClient,
 UDPServer,
 UNIXDatagramServer, UNIXDatagramClient,
 MulticastServer

These classes take arbitrary arguments in their constructors and pass them straight on to their respective reactor.listenXXX or reactor.connectXXX calls.

For example, the following service starts a web server on port 8080: TCPServer(8080, server.Site(r)). See the documentation for the reactor.listen/connect* methods for more information.

Class	TimerService	Service to periodically call a function
Class	CooperatorService	Simple `service.IService` which starts and stops a `twisted.internet.task.Cooperator`.
Class	StreamServerEndpointService	A `StreamServerEndpointService` is an `IService` which runs a server on a listening port described by an `IStreamServerEndpoint`.
Function	backoffPolicy	A timeout policy for `ClientService` which computes an exponential backoff interval with configurable parameters.
Class	ClientService	A `ClientService` maintains a single outgoing connection to a client endpoint, reconnecting after a configurable timeout when a connection fails, either before or after connecting.
Function	_maybeGlobalReactor
Class	_VolatileDataService	Undocumented
Class	_AbstractServer
Class	_AbstractClient
Class	_ReconnectingProtocolProxy	A proxy for a Protocol to provide connectionLost notification to a client connection service, in support of reconnecting when connections are lost.
Class	_DisconnectFactory	A `_DisconnectFactory` is a proxy for `IProtocolFactory` that catches `connectionLost` notifications and relays them.
Function	_firstResult	Return the first element of a generator and exhaust it.
Class	_ClientMachine	State machine for maintaining a single outgoing connection to an endpoint.

def _maybeGlobalReactor(maybeReactor): (source)

Returns the argument, or the global reactor if the argument is None.

def backoffPolicy(initialDelay=1.0, maxDelay=60.0, factor=1.5, jitter=_goodEnoughRandom): (source)

A timeout policy for ClientService which computes an exponential backoff interval with configurable parameters.

Parameters	initialDelay	Delay for the first reconnection attempt (default 1.0s). (type: `float`)
	maxDelay	Maximum number of seconds between connection attempts (default 60 seconds, or one minute). Note that this value is before jitter is applied, so the actual maximum possible delay is this value plus the maximum possible result of `jitter()`. (type: `float`)
	factor	A multiplicative factor by which the delay grows on each failed reattempt. Default: 1.5. (type: `float`)
	jitter	A 0-argument callable that introduces noise into the delay. By default, `random.random`, i.e. a pseudorandom floating-point value between zero and one. (type: 0-argument callable returning `float`)
Returns	a 1-argument callable that, given an attempt count, returns a floating point number; the number of seconds to delay. (type: see `ClientService.__init__`'s `retryPolicy` argument.)
Present Since	16.1.0

def _firstResult(gen): (source)

Return the first element of a generator and exhaust it.

MethodicalMachine.upon's collector argument takes a generator of output results. If the generator is exhausted, the later outputs aren't actually run.

Parameters	gen	Generator to extract values from
Returns	The first element of the generator.

API Documentation for Twisted, generated by pydoctor at 2018-10-15 19:29:43.

twisted.application.internet module documentation

`twisted.application.internet` module documentation