t.i.e.clientFromString(reactor, description) : function documentation

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.

Parameters	reactor	The client endpoint will be constructed with this reactor.
	description	The strports description to parse.
Returns	A new endpoint which can be used to connect with the parameters given by by description. (type: IStreamClientEndpoint)
Present Since	10.2