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Loading Data from Slack to AlloyDB with dlt in Python


We will be using the dlt PostgreSQL destination to connect to AlloyDB. You can get the connection string for AlloyDB from the GCP AlloyDB Console.

Need help deploying these pipelines, or figuring out how to run them in your data stack?

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Loading data from Slack to AlloyDB can streamline your business communications and data management. Slack is a messaging app for business that connects people to the information they need. AlloyDB for PostgreSQL is a fully managed, PostgreSQL-compatible database service designed for demanding workloads, including hybrid transactional and analytical processing. Using the open-source Python library dlt, you can efficiently transfer data from Slack to AlloyDB. This integration leverages dlt's capabilities to ensure a smooth and reliable data transfer process, allowing you to maintain enterprise-grade performance, reliability, and availability. For more information on Slack, visit here.

dlt Key Features

  • Automated maintenance: With schema inference and evolution, alerts, and short declarative code, maintenance becomes simple. Learn more.
  • Scalability via iterators, chunking, and parallelization: dlt offers scalable data extraction by leveraging iterators, chunking, and parallelization techniques. Learn more.
  • Schema enforcement and curation: dlt empowers users to enforce and curate schemas, ensuring data consistency and quality. Learn more.
  • Alerting and monitoring: Set up alerts to monitor the health of your data product and receive actionable notifications. Learn more.
  • Multiple authentication types for Snowflake: Supports password, key pair, and external authentication for Snowflake destinations. Learn more.

Getting started with your pipeline locally

0. Prerequisites

dlt requires Python 3.8 or higher. Additionally, you need to have the pip package manager installed, and we recommend using a virtual environment to manage your dependencies. You can learn more about preparing your computer for dlt in our installation reference.

1. Install dlt

First you need to install the dlt library with the correct extras for AlloyDB:

pip install "dlt[postgres]"

The dlt cli has a useful command to get you started with any combination of source and destination. For this example, we want to load data from Slack to AlloyDB. You can run the following commands to create a starting point for loading data from Slack to AlloyDB:

# create a new directory
mkdir slack_pipeline
cd slack_pipeline
# initialize a new pipeline with your source and destination
dlt init slack postgres
# install the required dependencies
pip install -r requirements.txt

The last command will install the required dependencies for your pipeline. The dependencies are listed in the requirements.txt:


You now have the following folder structure in your project:

├── .dlt/
│ ├── config.toml # configs for your pipeline
│ └── secrets.toml # secrets for your pipeline
├── slack/ # folder with source specific files
│ └── ...
├── # your main pipeline script
├── requirements.txt # dependencies for your pipeline
└── .gitignore # ignore files for git (not required)

2. Configuring your source and destination credentials

The dlt cli will have created a .dlt directory in your project folder. This directory contains a config.toml file and a secrets.toml file that you can use to configure your pipeline. The automatically created version of these files look like this:

generated config.toml

# put your configuration values here

log_level="WARNING" # the system log level of dlt
# use the dlthub_telemetry setting to enable/disable anonymous usage data reporting, see
dlthub_telemetry = true

generated secrets.toml

# put your secret values and credentials here. do not share this file and do not push it to github

access_token = "access_token" # please set me up!

dataset_name = "dataset_name" # please set me up!

database = "database" # please set me up!
password = "password" # please set me up!
username = "username" # please set me up!
host = "host" # please set me up!
port = 5432
connect_timeout = 15

2.1. Adjust the generated code to your usecase

Further help setting up your source and destinations
  • Read more about setting up the Slack source in our docs.
  • Read more about setting up the AlloyDB destination in our docs.

3. Running your pipeline for the first time

The dlt cli has also created a main pipeline script for you at, as well as a folder slack that contains additional python files for your source. These files are your local copies which you can modify to fit your needs. In some cases you may find that you only need to do small changes to your pipelines or add some configurations, in other cases these files can serve as a working starting point for your code, but will need to be adjusted to do what you need them to do.

The main pipeline script will look something like this:

"""Pipeline to load slack into duckdb."""

from typing import List

import dlt
from pendulum import datetime
from slack import slack_source

def load_all_resources(replies: bool = False) -> None:
"""Load all resources from slack without any selection of channels."""

pipeline = dlt.pipeline(
pipeline_name="slack", destination='postgres', dataset_name="slack_data"

source = slack_source(
start_date=datetime(2023, 9, 1),
end_date=datetime(2023, 9, 8),

# Uncomment the following line to load only the access_logs resource. It is not selected
# by default because it is a resource just available on paid accounts.
# source.access_logs.selected = True

load_info =

def select_resource(selected_channels: List[str]) -> None:
"""Execute a pipeline that will load the given Slack list of channels with the selected
channels incrementally beginning at the given start date."""

pipeline = dlt.pipeline(
pipeline_name="slack", destination='postgres', dataset_name="slack_data"

source = slack_source(
start_date=datetime(2023, 9, 1),
end_date=datetime(2023, 9, 8),
).with_resources("channels", "1-announcements", "dlt-github-ci")

load_info =

def get_users() -> None:
"""Execute a pipeline that will load Slack users list."""

pipeline = dlt.pipeline(
pipeline_name="slack", destination='postgres', dataset_name="slack_data"

source = slack_source(

load_info =

if __name__ == "__main__":
# Add your desired resources to the list...
# resources = ["access_logs", "conversations", "conversations_history"]

# load_all_resources()

# load all resources with replies
# load_all_resources(replies=True)

# select_resource(selected_channels=["dlt-github-ci"])
# select_resource(selected_channels=["1-announcements", "dlt-github-ci"])


Provided you have set up your credentials, you can run your pipeline like a regular python script with the following command:


4. Inspecting your load result

You can now inspect the state of your pipeline with the dlt cli:

dlt pipeline slack info

You can also use streamlit to inspect the contents of your AlloyDB destination for this:

# install streamlit
pip install streamlit
# run the streamlit app for your pipeline with the dlt cli:
dlt pipeline slack show

5. Next steps to get your pipeline running in production

One of the beauties of dlt is, that we are just a plain Python library, so you can run your pipeline in any environment that supports Python >= 3.8. We have a couple of helpers and guides in our docs to get you there:

The Deploy section will show you how to deploy your pipeline to

  • Deploy with GitHub Actions: Learn how to set up and deploy your pipeline using GitHub Actions for automated CI/CD workflows. Read more
  • Deploy with Airflow and Google Composer: Follow this guide to deploy your pipeline in a managed Airflow environment provided by Google. Read more
  • Deploy with Google Cloud Functions: Explore how to deploy your pipeline using Google Cloud Functions for a serverless approach. Read more
  • Other Deployment Options: Check out various other deployment methods and detailed guides to suit different environments and use cases. Read more

The running in production section will teach you about:

  • How to Monitor your pipeline: Learn how to effectively monitor your dlt pipeline in production to ensure smooth and error-free operations. How to Monitor your pipeline
  • Set up alerts: Set up alerts to get notified about any issues or anomalies in your dlt pipeline, allowing for quick responses and minimal downtime. Set up alerts
  • And set up tracing: Implement tracing to gain insights into the performance and behavior of your dlt pipeline, making it easier to diagnose and fix problems. And set up tracing

Additional pipeline guides

This demo works on codespaces. Codespaces is a development environment available for free to anyone with a Github account. You'll be asked to fork the demo repository and from there the README guides you with further steps.
The demo uses the Continue VSCode extension.

Off to codespaces!


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