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How to Add Your Own Data Source

Setup development environment

Clone gerev

# clone with ssh
git clone [email protected]:GerevAI/gerev.git

# or clone with https
git clone https://github.com/GerevAI/gerev.git

Then setup backend:

cd gerev/app
pip install -r requirements.txt
uvicorn main:app

This will host UI on the same port too. http://localhost:8000

Wanna develop the UI? run:

cd ui
npm install
npm start

then go to http://localhost:3000


0. Verify your data source is Gerev-able

Gerev supports data sources that are either:

  1. Exposing a REST API.
  2. Crawlable.
  3. Accessible by the Gerev container some other way.

For instance, the Confluence data source uses the Confluence REST API to list spaces and then fetch Confluence pages (atlassian-python-api)

The Slack data source uses the Slack API to list channels and then list messages from each channel (slack_sdk)

0.1 Rest API Tokens

Find a way to generate some API key for your data source.

we'd recommend asking Google "how to generate personal access token for <your data source name>".

Generating token usually involves going to your profile settings, creating a new access token, and copying it.

Got your token? Write down the process steps, you'll need it later.


Let's go

This guide will walk you through the process of creating a data source for the imagniary website called Magic.

Follow the steps below to create your custom data source:

1. Create a package for your data source

  1. Under app/data_source/sources, create a new magic python package with magic.py and __init__.py files inside.

├── app
│   ├── data_source
│   │   ├── sources
│   │   │   ├── magic
│   │   │   │   ├── __init__.py
│   │   │   │   ├── magic.py

2. Import required modules

It's not common to guide you through the imports, but you'll need them all.

magic.py

import logging
from datetime import datetime
from typing import List, Dict

from pydantic import BaseModel
from data_source.api.base_data_source import BaseDataSource, BaseDataSourceConfig, ConfigField
from data_source.api.basic_document import BasicDocument, DocumentType
from queues.index_queue import IndexQueue

3. Create a configuration class

Create a class that inherits from BaseDataSourceConfig for your data source configuration.

Add your data-source's fields.

class MagicConfig(BaseDataSourceConfig):
    url: str
    username: str
    token: str

4. Create a data source class

Create a new class that inherits from BaseDataSource and implement the 3 abstract methods:

4.1. get_config_fields

4.2. validate_config

4.3. _feed_new_documents

File structure:

class MagicDataSource(BaseDataSource):

    @staticmethod
    def get_config_fields() -> List[ConfigField]:
        """
        list of the config fields which should be the same fields as in MagicConfig, for dynamic UI generation
        """
        pass

    @staticmethod
    def validate_config(config: Dict) -> None:
        """
        Validate the configuration and raise an exception if it's invalid,
        You should try to actually connect to the data source and verify that it's working
        """
        pass

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        magic_config = MagicConfig(**self._config)
        self._magic_client = MagicClient(url=magic_config.url,
                                         username=magic_config.username,
                                         token=magic_config.token)

    def _feed_new_documents(self) -> None:
        """
        Add new documents to the index queue, will explaine later
        """
        pass

4.1. get_config_fields

Return a list of ConfigFields that describes the data-source's configuration fields required (same fields as in MagicConfig but with UI fields).

@staticmethod
def get_config_fields() -> List[ConfigField]:
    """
    list of the config fields which should be the same fields as in MagicConfig, for dynamic UI generation
    """
    return [
            ConfigField(label="URL", name="url", placeholder="Enter the URL of your Magic instance"),
            ConfigField(label="Username", name="username", placeholder="Enter your username"),
            ConfigField(label="Token", name="token", placeholder="Enter your token", input_type=HTMLInputType.PASSWORD)
        ]

4.2. validate_config

This method should validate the provided configuration and raise an InvalidDataSourceConfig exception if it's invalid.

it MUST connect to the data source and verify that it's working.

Some data-sources have a auth_check method, you can use it to verify the connection. Otherwise you can try to list something from the data source.

@staticmethod
def validate_config(config: Dict) -> None:
        """
        Validate the configuration and raise an exception if it's invalid,
        You should try to actually connect to the data source and verify that it's working
        """
        try:
            parsed_config = MagicConfig(**config)
            magic_client = MagicClient(url=parsed_config.url,
                                       username=parsed_config.username,
                                       token=parsed_config.token)
            magic_client.auth_check() # if no such thing, try to list() something
        except Exception as e:
            raise InvalidDataSourceConfig from e

4.3. _feed_new_documents

This method should add new documents to the index queue. The implementation depends on the specific data source you're working with.

Flow should look like:

  1. List spaces/channels/whatever from the data source.
  2. Run tasks to fetch documents from each space/channel/whatever.
    • tasks are a built-in Gerev pipeline to run async functions with workers for maximum performance.
  3. Parse each document into a BasicDocument object.
  4. Feed the BasicDocument object to the index queue.
def _feed_new_documents(self) -> None:
    channels = self._magic_client.list_channels()
    for channel in channels:
        self._add_task(self._feed_channel, channel)

def _fetch_channel(self, channel: Channel) -> None:
    messages = self._magic_client.list_messages(channel)
    for message in messages:
        doc = BasicDocument(
            id=message["id"],
            data_source_id=self._data_source_id,
            type=DocumentType.MESSAGE,
            title=message['title'],
            content=message.get("description"),
            author=message['author']['name'],
            author_image_url=message['author']['avatar_url'],
            location=message['references']['full'],
            url=message['web_url'],
            timestamp=message['created_at'],
        )
        IndexQueue.get_instance().put_single(document)
  1. Before adding to queue, check whether document is newer than self._last_indexed_at, if not, skip it.
last_modified = datetime.strptime(message["updated_at"], "%Y-%m-%dT%H:%M:%S.%fZ")
if last_modified < self._last_index_time:
    logger.info(f"Message {message['id']} is too old, skipping")
    continue

5. UI instructions

You should add your data source instructions to the UI.

5.1. data-source-panel.tsx

go to gerev/ui/src/components/data-source-panel.tsx and add your data source to the html.

{
 this.state.selectedDataSource.value === 'Magic' && (
    <span className="flex flex-col leading-9  text-xl text-white">
       <span>1. {'Go to Magic -> top-right profile picture -> Edit profile'}</span>
       <span>2. {'Scroll down to API tokens -> Create token -> Name it'}</span>
       <span>3. {"Set 'Expiry Date' 01/01/2100, create, copy token id + token secret"}</span>
    </span>
 )
}

6. Logo

Add your data-source logo.png to app/static/data_sources_icons.

Done! 🚀

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