t.i.endpoints : module documentation

Part of twisted.internet View Source

Implementations of IStreamServerEndpoint and IStreamClientEndpoint that wrap the IReactorTCP, IReactorSSL, and IReactorUNIX interfaces.

This also implements an extensible mini-language for describing endpoints, parsed by the clientFromString and serverFromString functions.

Present Since10.1
Interface IPlugin Undocumented
Class StandardIOEndpoint A Standard Input/Output endpoint
Class StandardErrorBehavior Constants used in ProcessEndpoint to decide what to do with stderr.
Class ProcessEndpoint An endpoint for child processes
Class TCP4ServerEndpoint Implements TCP server endpoint with an IPv4 configuration
Class TCP6ServerEndpoint Implements TCP server endpoint with an IPv6 configuration
Class TCP4ClientEndpoint TCP client endpoint with an IPv4 configuration.
Class TCP6ClientEndpoint TCP client endpoint with an IPv6 configuration.
Class SSL4ServerEndpoint SSL secured TCP server endpoint with an IPv4 configuration.
Class SSL4ClientEndpoint SSL secured TCP client endpoint with an IPv4 configuration
Class UNIXServerEndpoint UnixSocket server endpoint.
Class UNIXClientEndpoint UnixSocket client endpoint.
Class AdoptedStreamServerEndpoint An endpoint for listening on a file descriptor initialized outside of Twisted.
Function serverFromString Construct a stream server endpoint from an endpoint description string.
Function quoteStringArgument No summary
Function clientFromString Construct a client endpoint from a description string.
Function connectProtocol Connect a protocol instance to an endpoint.
Class _WrappingProtocol Wrap another protocol in order to notify my user when a connection has been made.
Class _WrappingFactory Wrap a factory in order to wrap the protocols it builds.
Class _ProcessEndpointTransport An ITransport provider for the IProtocol instance passed to the process endpoint.
Class _WrapIProtocol An IProcessProtocol provider that wraps an IProtocol.
Class _TCPServerEndpoint A TCP server endpoint interface
Function _parseTCP Internal parser function for _parseServer to convert the string arguments for a TCP(IPv4) stream endpoint into the structured arguments.
Function _parseUNIX Internal parser function for _parseServer to convert the string arguments for a UNIX (AF_UNIX/SOCK_STREAM) stream endpoint into the structured arguments.
Function _parseSSL Internal parser function for _parseServer to convert the string arguments for an SSL (over TCP/IPv4) stream endpoint into the structured arguments.
Class _StandardIOParser Stream server endpoint string parser for the Standard I/O type.
Class _SystemdParser Stream server endpoint string parser for the systemd endpoint type.
Class _TCP6ServerParser Stream server endpoint string parser for the TCP6ServerEndpoint type.
Function _tokenize Tokenize a strports string and yield each token.
Function _parse Convert a description string into a list of positional and keyword parameters, using logic vaguely like what Python does.
Function _parseServer Parse a stports description into a 2-tuple of arguments and keyword values.
Function _serverFromStringLegacy Underlying implementation of serverFromString which avoids exposing the deprecated 'default' argument to anything but strports.service.
Function _parseClientTCP Perform any argument value coercion necessary for TCP client parameters.
Function _loadCAsFromDir Load certificate-authority certificate objects in a given directory.
Function _parseClientSSL Perform any argument value coercion necessary for SSL client parameters.
Function _parseClientUNIX Perform any argument value coercion necessary for UNIX client parameters.
def _parseTCP(factory, port, interface='', backlog=50): (source)
Internal parser function for _parseServer to convert the string arguments for a TCP(IPv4) stream endpoint into the structured arguments.
Parametersfactorythe protocol factory being parsed, or None. (This was a leftover argument from when this code was in strports, and is now mostly None and unused.) (type: IProtocolFactory or NoneType)
portthe integer port number to bind (type: str)
interfacethe interface IP to listen on
backlogthe length of the listen queue (type: str)
Returnsa 2-tuple of (args, kwargs), describing the parameters to IReactorTCP.listenTCP (or, modulo argument 2, the factory, arguments to TCP4ServerEndpoint.
def _parseUNIX(factory, address, mode='666', backlog=50, lockfile=True): (source)
Internal parser function for _parseServer to convert the string arguments for a UNIX (AF_UNIX/SOCK_STREAM) stream endpoint into the structured arguments.
Parametersfactorythe protocol factory being parsed, or None. (This was a leftover argument from when this code was in strports, and is now mostly None and unused.) (type: IProtocolFactory or NoneType)
addressthe pathname of the unix socket (type: str)
backlogthe length of the listen queue (type: str)
lockfileA string '0' or '1', mapping to True and False respectively. See the wantPID argument to listenUNIX
Returnsa 2-tuple of (args, kwargs), describing the parameters to IReactorTCP.listenUNIX (or, modulo argument 2, the factory, arguments to UNIXServerEndpoint.
def _parseSSL(factory, port, privateKey='server.pem', certKey=None, sslmethod=None, interface='', backlog=50): (source)
Internal parser function for _parseServer to convert the string arguments for an SSL (over TCP/IPv4) stream endpoint into the structured arguments.
Parametersfactorythe protocol factory being parsed, or None. (This was a leftover argument from when this code was in strports, and is now mostly None and unused.) (type: IProtocolFactory or NoneType)
portthe integer port number to bind (type: str)
interfacethe interface IP to listen on
backlogthe length of the listen queue (type: str)
privateKeyThe file name of a PEM format private key file. (type: str)
certKeyThe file name of a PEM format certificate file. (type: str)
sslmethodThe string name of an SSL method, based on the name of a constant in OpenSSL.SSL. Must be one of: "SSLv23_METHOD", "SSLv2_METHOD", "SSLv3_METHOD", "TLSv1_METHOD". (type: str)
Returnsa 2-tuple of (args, kwargs), describing the parameters to IReactorSSL.listenSSL (or, modulo argument 2, the factory, arguments to SSL4ServerEndpoint.
def _tokenize(description): (source)
Tokenize a strports string and yield each token.
Parametersdescriptiona string as described by serverFromString or clientFromString.
Returnsan iterable of 2-tuples of (_OP or _STRING, string). Tuples starting with _OP will contain a second element of either ':' (i.e. 'next parameter') or '=' (i.e. 'assign parameter value'). For example, the string 'hello:greet\=ing=world' would result in a generator yielding these values:
   _STRING, 'hello'
   _OP, ':'
   _STRING, 'greet=ing'
   _OP, '='
   _STRING, 'world'
def _parse(description): (source)
Convert a description string into a list of positional and keyword parameters, using logic vaguely like what Python does.
Parametersdescriptiona string as described by serverFromString or clientFromString.
Returnsa 2-tuple of (args, kwargs), where 'args' is a list of all ':'-separated strs not containing an '=' and 'kwargs' is a map of all strs which do contain an '='. For example, the result of _parse('a:b:d=1:c') would be (['a', 'b', 'c'], {'d': '1'}).
def _parseServer(description, factory, default=None): (source)
Parse a stports description into a 2-tuple of arguments and keyword values.
ParametersdescriptionA description in the format explained by serverFromString. (type: str)
factoryA 'factory' argument; this is left-over from twisted.application.strports, it's not really used. (type: IProtocolFactory or None)
defaultDeprecated argument, specifying the default parser mode to use for unqualified description strings (those which do not have a ':' and prefix). (type: str or NoneType)
Returnsa 3-tuple of (plugin or name, arguments, keyword arguments)
def _serverFromStringLegacy(reactor, description, default): (source)
Underlying implementation of serverFromString which avoids exposing the deprecated 'default' argument to anything but strports.service.
def serverFromString(reactor, description): (source)
Construct a stream server endpoint from an endpoint description string.

The format for server endpoint descriptions is a simple string. It is a prefix naming the type of endpoint, then a colon, then the arguments for that endpoint.

For example, you can call it like this to create an endpoint that will listen on TCP port 80:

   serverFromString(reactor, "tcp:80")

Additional arguments may be specified as keywords, separated with colons. For example, you can specify the interface for a TCP server endpoint to bind to like this:

   serverFromString(reactor, "tcp:80:interface=127.0.0.1")

SSL server endpoints may be specified with the 'ssl' prefix, and the private key and certificate files may be specified by the privateKey and certKey arguments:

   serverFromString(reactor, "ssl:443:privateKey=key.pem:certKey=crt.pem")

If a private key file name (privateKey) isn't provided, a "server.pem" file is assumed to exist which contains the private key. If the certificate file name (certKey) isn't provided, the private key file is assumed to contain the certificate as well.

You may escape colons in arguments with a backslash, which you will need to use if you want to specify a full pathname argument on Windows:

   serverFromString(reactor,
       "ssl:443:privateKey=C\:/key.pem:certKey=C\:/cert.pem")

finally, the 'unix' prefix may be used to specify a filesystem UNIX socket, optionally with a 'mode' argument to specify the mode of the socket file created by listen:

   serverFromString(reactor, "unix:/var/run/finger")
   serverFromString(reactor, "unix:/var/run/finger:mode=660")

This function is also extensible; new endpoint types may be registered as IStreamServerEndpointStringParser plugins. See that interface for more information.

ParametersreactorThe server endpoint will be constructed with this reactor.
descriptionThe strports description to parse.
ReturnsA new endpoint which can be used to listen with the parameters given by by description. (type: IStreamServerEndpoint)
RaisesValueErrorwhen the 'description' string cannot be parsed.
Present Since10.2
def quoteStringArgument(argument): (source)

Quote an argument to serverFromString and clientFromString. Since arguments are separated with colons and colons are escaped with backslashes, some care is necessary if, for example, you have a pathname, you may be tempted to interpolate into a string like this:

   serverFromString("ssl:443:privateKey=%s" % (myPathName,))

This may appear to work, but will have portability issues (Windows pathnames, for example). Usually you should just construct the appropriate endpoint type rather than interpolating strings, which in this case would be SSL4ServerEndpoint. There are some use-cases where you may need to generate such a string, though; for example, a tool to manipulate a configuration file which has strports descriptions in it. To be correct in those cases, do this instead:

   serverFromString("ssl:443:privateKey=%s" %
                    (quoteStringArgument(myPathName),))
ParametersargumentThe part of the endpoint description string you want to pass through. (type: str)
ReturnsThe quoted argument. (type: str)
def _parseClientTCP(*args, **kwargs): (source)
Perform any argument value coercion necessary for TCP client parameters.

Valid positional arguments to this function are host and port.

Valid keyword arguments to this function are all IReactorTCP.connectTCP arguments.

ReturnsThe coerced values as a dict.
def _loadCAsFromDir(directoryPath): (source)
Load certificate-authority certificate objects in a given directory.
ParametersdirectoryPatha FilePath pointing at a directory to load .pem files from.
Returnsa list of OpenSSL.crypto.X509 objects.
def _parseClientSSL(*args, **kwargs): (source)
Perform any argument value coercion necessary for SSL client parameters.

Valid keyword arguments to this function are all IReactorSSL.connectSSL arguments except for contextFactory. Instead, certKey (the path name of the certificate file) privateKey (the path name of the private key associated with the certificate) are accepted and used to construct a context factory.

Valid positional arguments to this function are host and port.

ParameterscaCertsDirThe one parameter which is not part of IReactorSSL.connectSSL's signature, this is a path name used to construct a list of certificate authority certificates. The directory will be scanned for files ending in .pem, all of which will be considered valid certificate authorities for this connection. (type: str)
ReturnsThe coerced values as a dict.
def _parseClientUNIX(*args, **kwargs): (source)
Perform any argument value coercion necessary for UNIX client parameters.

Valid keyword arguments to this function are all IReactorUNIX.connectUNIX keyword arguments except for checkPID. Instead, lockfile is accepted and has the same meaning. Also path is used instead of address.

Valid positional arguments to this function are path.

ReturnsThe coerced values as a dict.
def clientFromString(reactor, description): (source)
Construct a client endpoint from a description string.

Client description strings are much like server description strings, although they take all of their arguments as keywords, aside from host and port.

You can create a TCP client endpoint with the 'host' and 'port' arguments, like so:

   clientFromString(reactor, "tcp:host=www.example.com:port=80")

or, without specifying host and port keywords:

   clientFromString(reactor, "tcp:www.example.com:80")

Or you can specify only one or the other, as in the following 2 examples:

   clientFromString(reactor, "tcp:host=www.example.com:80")
   clientFromString(reactor, "tcp:www.example.com:port=80")

or an SSL client endpoint with those arguments, plus the arguments used by the server SSL, for a client certificate:

   clientFromString(reactor, "ssl:web.example.com:443:"
                             "privateKey=foo.pem:certKey=foo.pem")

to specify your certificate trust roots, you can identify a directory with PEM files in it with the caCertsDir argument:

   clientFromString(reactor, "ssl:host=web.example.com:port=443:"
                             "caCertsDir=/etc/ssl/certs")

Both TCP and SSL client endpoint description strings can include a 'bindAddress' keyword argument, whose value should be a local IPv4 address. This fixes the client socket to that IP address:

   clientFromString(reactor, "tcp:www.example.com:80:"
                             "bindAddress=192.0.2.100")

NB: Fixed client ports are not currently supported in TCP or SSL client endpoints. The client socket will always use an ephemeral port assigned by the operating system

You can create a UNIX client endpoint with the 'path' argument and optional 'lockfile' and 'timeout' arguments:

   clientFromString(reactor, "unix:path=/var/foo/bar:lockfile=1:timeout=9")

or, with the path as a positional argument with or without optional arguments as in the following 2 examples:

   clientFromString(reactor, "unix:/var/foo/bar")
   clientFromString(reactor, "unix:/var/foo/bar:lockfile=1:timeout=9")

This function is also extensible; new endpoint types may be registered as IStreamClientEndpointStringParser plugins. See that interface for more information.

ParametersreactorThe client endpoint will be constructed with this reactor.
descriptionThe strports description to parse.
ReturnsA new endpoint which can be used to connect with the parameters given by by description. (type: IStreamClientEndpoint)
Present Since10.2
def connectProtocol(endpoint, protocol): (source)
Connect a protocol instance to an endpoint.

This allows using a client endpoint without having to create a factory.

ParametersendpointA client endpoint to connect to.
protocolA protocol instance.
ReturnsThe result of calling connect on the endpoint, i.e. a Deferred that will fire with the protocol when connected, or an appropriate error.
API Documentation for Twisted, generated by pydoctor at 2013-11-18 18:11:01.