Writing interactive bots

Zulip’s API has a powerful framework for interactive bots that react to messages in Zulip. This page will guide you through writing your own interactive bot.

Installing a development version of the Zulip bots package
Bot template
Testing a bot’s output
Troubleshooting

Installing a development version of the Zulip bots package

This will provide convenient tooling for developing and testing your bot.

Clone the python-zulip-api repository:

git clone https://github.com/zulip/python-zulip-api.git

Navigate into your cloned repository:
```
cd python-zulip-api
```
Install all requirements in a Python virtualenv:
```
python3 ./tools/provision
```
Run the command provided in the final output of the provision process to enter the new virtualenv. The command will be of the form source .../activate.
You should now see the name of your virtualenv preceding your prompt (e.g., (zulip-api-py3-venv)).

Bot template

The only file required for a new bot is <my-bot>.py. It has the following structure:

class MyBotHandler(object):
    '''
    A docstring documenting this bot.
    '''

    def usage(self):
        return '''Your description of the bot'''

    def handle_message(self, message, bot_handler):
        # add your code here

handler_class = MyBotHandler

The class name (in this case MyBotHandler) can be defined by you and should match the name of your bot. To register your bot’s class, adjust the last line handler_class = MyBotHandler to match your class name.

Every bot must implement the usage(self) and handle_message(self, message, bot_handler) functions. They are described in detail in the interactive bots API documentation.

All the files associated with a bot (e.g., tests, documentation, etc.) should be placed in the same directory as <my-bot>.py.

Testing a bot’s output

You can see how a bot reacts to a message without setting it up on a server, using the zulip-bot-shell tool.

Install all requirements.
Run zulip-bot-shell to test one of the bots in zulip_bots/bots.

Example invocations:

> zulip-bot-shell converter

Enter your message: "12 meter yard"
Response: 12.0 meter = 13.12336 yard

> zulip-bot-shell -b ~/followup.conf followup

Enter your message: "Task completed"
Response: stream: followup topic: foo_sender@zulip.com
          from foo_sender@zulip.com: Task completed

Note that the -b (aka --bot-config-file) argument is for an optional third party config file (e.g., ~/giphy.conf), which only applies to certain types of bots.

Troubleshooting

I modified my bot’s code, yet the changes don’t seem to have an effect

Ensure that you restarted the zulip-run-bot script.

My bot won’t start

Ensure that your API config file is correct (download the config file from the server).
Ensure that you bot script is located in zulip_bots/bots/<my-bot>/
Are you using your own Zulip development server? Ensure that you run your bot outside the Vagrant environment.