GitHub - robotframework/PythonRemoteServer: Robot Framework remote server implemented with Python (original) (raw)

Python Remote Server for Robot Framework

Robot Framework remote servers allow hosting test libraries on different processes or machines than Robot Framework itself is running on. This project implements a generic remote server using the Python programming language. See the remote library interface documentation for more information about the remote interface in general as well as for a list of remote server implementations in other programming languages.

This project is hosted on GitHub and downloads are available on PyPI.

Supported Python versions

This remote server is implemented with Python and supports also Jython (JVM),IronPython (.NET) and PyPy. Remote server version 1.1 supports Python 2.6, 2.7 and 3.3-3.9. Remote server version 1.1.1 supports Python 3.10 and 3.11 as well.

Supported library APIs

Starting from the remote server version 1.1, Robot Framework's static, hybrid and dynamic library APIs are all supported. This includes setting custom name and tags for keywords using the robot.api.deco.keyword. Earlier remote server versions support only the static and hybrid APIs and do not support the keyword decorator at all.

For most parts these APIs work exactly like when using with Robot Framework normally. The main limitation is that logging using robot.api.logger or Python's logging module is currently not supported.

Installation

The easiest installation approach is using pip:

pip install robotremoteserver

Alternatively you can download the source distribution from PyPI, extract it and install the remote server using:

python setup.py install

Remote server configuration

The remote server is implemented as a class RobotRemoteServer and it accepts the following configuration parameters when it is initialized:

Argument Default Explanation
library Test library instance or module to host. Mandatory argument.
host '127.0.0.1' Address to listen. Use '0.0.0.0' to listen to all available IPv4 interfaces.
port 8270 Port to listen. Use 0 to select a free port automatically. Can be given as an integer or as a string. The default port 8270 is registered by IANA for remote server usage.
port_file None File to write the port that is used. None (default) means no such file is written.
allow_stop 'DEPRECATED' Deprecated since version 1.1. Use allow_remote_stop instead.
serve True If True, start the server automatically and wait for it to be stopped. If False, server can be started using the serve method. New in version 1.1.
allow_remote_stop True Allow/disallow stopping the server remotely using Stop Remote Server keyword and stop_remote_server XML-RPC method. New in version 1.1.

Starting remote server

The remote server can be started simply by creating an instance of the server and passing a test library instance or module to it:

from robotremoteserver import RobotRemoteServer from mylibrary import MyLibrary

RobotRemoteServer(MyLibrary())

By default the server listens to address 127.0.0.1 and port 8270. As discussed above, the remote server accepts various configuration parameters. Some of them are used by this example:

from robotremoteserver import RobotRemoteServer from examplelibrary import ExampleLibrary

RobotRemoteServer(ExampleLibrary(), host='10.0.0.42', port=0, port_file='/tmp/remote-port.txt')

Starting from version 1.1, the server can be initialized without starting it by using the argument serve=False. The server can then started afterwards by calling its serve method explicitly. This example is functionally equivalent to the example above:

from robotremoteserver import RobotRemoteServer from examplelibrary import ExampleLibrary

server = RobotRemoteServer(ExampleLibrary(), host='10.0.0.42', port=0, port_file='/tmp/remote-port.txt', serve=False) server.serve()

Starting server on background

The main benefit of separately initializing and starting the server is that it makes it easier to start the server in a background thread. Servers started in a thread work exactly like servers running in the main tread except thatstopping the server gracefully using Ctrl-C or signals is not supported automatically. Users must thus register signal handlers separately if needed.

Also this following example is functionally nearly equivalent to the earlier examples except. The main difference is that not all same signals are handled.

import signal import threading from examplelibrary import ExampleLibrary from robotremoteserver import RobotRemoteServer

server = RobotRemoteServer(ExampleLibrary(), port=0, serve=False) signal.signal(signal.SIGINT, lambda signum, frame: server.stop()) server_thread = threading.Thread(target=server.serve) server_thread.start() while server_thread.is_alive(): server_thread.join(0.1)

Getting active server port

If the server uses the default port 8270 or some other port is given explicitly when configuring the server, you obviously know which port to use when connecting the server. When using the port 0, the server selects a free port automatically, but there are various ways how to find out the actual port:

Stopping remote server

The remote server can be gracefully stopped using several different methods:

Testing is server running

Starting from the version 1.0.1, the robotremoteserver module supports testing is a remote server running. This can be accomplished by running the module as a script with test argument and an optional URI:

$ python -m robotremoteserver test Remote server running at http://127.0.0.1:8270. $ python -m robotremoteserver test http://10.0.0.42:57347 No remote server running at http://10.0.0.42:57347.

Starting from the version 1.1, the robotremoteserver module contains function test_remote_server that can be used programmatically:

from robotremoteserver import test_remote_server

if test_remote_server('http://localhost:8270'): print('Remote server running!')

The robotremoteserver module can be also used to stop a remote server by using stop argument on the command line or by using thestop_remote_server function programmatically. Testing and stopping should work also with other Robot Framework remote server implementations.

Listing keywords and viewing documentation

Using the built-in Libdoc tool you can list the keywords available on the server:

$ python -m robot.libdoc Remote::http://127.0.0.1:8270 list Count Items In Directory Stop Remote Server Strings Should Be Equal

It is also possible to show the documentation on the command line by using argument show. HTML documentation can be created by providing name of an output file:

$ python -m robot.libdoc Remote::http://127.0.0.1:8270 MyLibrary.html /path/to/MyLibrary.html

Example

The remote server project contains an example that can be studied and also executed once the library is installed. You can get the example by cloning the project on GitHub, and it is also included in the source distribution available on PyPI.