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Python implementation of the Varlink protocol
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[](https://www.varlink.org/Language-Bindings) [](https://pypi.org/project/varlink/) [](https://pypi.org/project/varlink/) [](https://pypi.org/project/varlink/) # python-varlink A [varlink](http://varlink.org) implementation for Python. * [GIT Repository](https://github.com/varlink/python) * [API documentation](https://varlink.github.io/python/) ## python varlink installation From PyPI: ```bash $ pip3 install --user varlink ``` With Fedora: ```bash $ sudo dnf install python3-varlink ``` With Debian: ```bash $ sudo apt install python3-varlink ``` ## Examples See the [tests](https://github.com/varlink/python-varlink/tree/master/varlink/tests) directory. ```bash $ python3 -m varlink.tests.test_orgexamplemore --varlink="unix:/tmp/test" & [1] 6434 $ python3 -m varlink.cli help unix:/tmp/test/org.example.more # Example Varlink service interface org.example.more # Enum, returning either start, progress or end # progress: [0-100] type State ( start: ?bool, progress: ?int, end: ?bool ) # Returns the same string method Ping(ping: string) -> (pong: string) # Dummy progress method # n: number of progress steps method TestMore(n: int) -> (state: State) # Stop serving method StopServing() -> () # Something failed in TestMore error TestMoreError (reason: string) $ python3 -m varlink.cli call unix:/tmp/test/org.example.more.Ping '{ "ping": "Ping"}' { "pong": "Ping" } $ fg python3 -m varlink.tests.test_orgexamplemore --varlink="unix:/tmp/test" ^C ``` ```bash $ python3 -m varlink.tests.test_orgexamplemore --client -A 'python3 -m varlink.tests.test_orgexamplemore --varlink=$VARLINK_ADDRESS' Connecting to unix:/tmp/tmppxrbqk9p/4927 Listening on /tmp/tmppxrbqk9p/4927 --- Start --- Progress: 0 Progress: 10 Progress: 20 Progress: 30 Progress: 40 Progress: 50 Progress: 60 Ping: Test Progress: 70 Ping: Test Progress: 80 Ping: Test Progress: 90 Ping: Test Progress: 100 Ping: Test --- End --- ``` ```bash $ PYTHONPATH=$(pwd) python3 ./varlink/tests/test_orgexamplemore.py Connecting to unix:/tmp/tmp7n6zc67d/5257 Listening on /tmp/tmp7n6zc67d/5257 --- Start --- Progress: 0 Progress: 10 Progress: 20 Progress: 30 Progress: 40 Progress: 50 Progress: 60 Ping: Test Progress: 70 Ping: Test Progress: 80 Ping: Test Progress: 90 Ping: Test Progress: 100 Ping: Test --- End --- ``` ```bash $ python3 -m varlink.tests.test_orgexamplemore --varlink="unix:/tmp/test" & Listening on /tmp/test [1] 6434 python3 -m varlink.tests.test_orgexamplemore --client --varlink="unix:/tmp/test" Connecting to unix:/tmp/test Ping: Test --- Start --- Progress: 0 Progress: 10 Progress: 20 Progress: 30 Progress: 40 Progress: 50 Progress: 60 Ping: Test Progress: 70 Ping: Test Progress: 80 Ping: Test Progress: 90 Ping: Test Progress: 100 Ping: Test --- End --- $ python3 -m varlink.cli call --more unix:/tmp/test/org.example.more.TestMore '{ "n": 10 }' {'state': {'start': True}} {'state': {'progress': 0}} {'state': {'progress': 10}} {'state': {'progress': 20}} {'state': {'progress': 30}} {'state': {'progress': 40}} {'state': {'progress': 50}} {'state': {'progress': 60}} {'state': {'progress': 70}} {'state': {'progress': 80}} {'state': {'progress': 90}} {'state': {'progress': 100}} {'state': {'end': True}} $ fg python3 -m varlink.tests.test_orgexamplemore --varlink="unix:/tmp/test" ^C ``` You can also start the clients and server with URLs following the [varlink URL standard](https://varlink.org/#address) with `unix:` and `tcp:`. E.g. - unix:@anonuds - unix:/run/myserver/socketfile - tcp:127.0.0.1:12345 - tcp:[::1]:12345 ### Activation Mode Activation mode starts the service to connect to and passes the socket via socket activation. The ```VARLINK_ADDRESS``` environment variable contains the varlink address URI. ```bash $ python3 -m varlink.cli --activate 'python3 -m varlink.tests.test_orgexamplemore --varlink=$VARLINK_ADDRESS' call org.example.more.Ping '{ "ping": "Ping"}' Listening on @00352 {'pong': 'Ping'} ``` ### Bridge Mode Bridge mode allows one to tunnel to a remote point via stdin/stdout and call a method. Running ```varlink bridge``` allows one to connect stdio to the host services via ```org.varlink.resolver``` interface resolving. ```bash # python3 -m varlink.cli -b "ssh host.example.org varlink bridge" call com.redhat.machine.GetInfo '{}' { "hostname": "host.example.org", "system": { "id": "fedora", "kernel_version": "4.18.0-0.rc5.git1.2.fc29.x86_64", "name": "Fedora", "version": "29" }, "virtualization": { "name": "none" } } ``` ### Varlink Certification Server ``` $ python3 -m varlink.tests.test_certification --varlink=tcp:127.0.0.1:12345 ``` ### Varlink Certification Client ``` $ python3 -m varlink.tests.test_certification --varlink=tcp:127.0.0.1:12345 --client ```
