oncall-engine/dev

Developer quickstart

Related: How to develop integrations

Quick Start using Kubernetes and Tilt (beta)

If you are experiencing issues, please check "Running the project with docker-compose".

Install dependencies

• Tilt | Kubernetes for Prod, Tilt for Dev
• tilt-dev/ctlptl: Making local Kubernetes clusters fun and easy to set up
• Kind
• Yarn

Launch the environment

1. Create local k8s cluster:

   make cluster/up
   

2. Deploy the project:

   tilt up
   

   You can set local environment variables using dev/helm-local.dev.yml file, e.g.:

   env:
     - name: FEATURE_LABELS_ENABLED_FOR_ALL
       value: "True"
   

3. Wait until all resources are green and open http://localhost:3000/a/grafana-oncall-app (user: oncall, password: oncall)

4. Modify source code, backend and frontend will be hot reloaded

5. Clean up the project by deleting the local k8s cluster:

   make cluster/down
   

Running the project with docker-compose

By default everything runs inside Docker. These options can be modified via the COMPOSE_PROFILES environment variable.

1. Firstly, ensure that you have docker installed and running on your machine. NOTE: the docker-compose-developer.yml file uses some syntax/features that are only supported by Docker Compose v2. For instructions on how to enable this (if you haven't already done so), see here. Ensure you have Docker Compose version 2.20.2 or above installed - update instructions are here.
2. Run make init start. By default this will run everything in Docker, using SQLite as the database and Redis as the message broker/cache. See COMPOSE_PROFILES below for more details on how to swap out/disable which components are run in Docker.
3. Open Grafana in a browser here (login: oncall, password: oncall).
4. You should now see the OnCall plugin configuration page. You may safely ignore the warning about the invalid plugin signature. Set "OnCall backend URL" as "http://host.docker.internal:8080". When opening the main plugin page, you may also ignore warnings about version mismatch and lack of communication channels.
5. Enjoy! Check our OSS docs if you want to set up Slack, Telegram, Twilio or SMS/calls through Grafana Cloud.
6. (Optional) Install pre-commit hooks by running make install-precommit-hook

Note: on subsequent startups you can simply run make start, this is a bit faster because it skips the frontend build step.

COMPOSE_PROFILES

This configuration option represents a comma-separated list of docker-compose profiles. It allows you to swap-out, or disable, certain components in Docker.

This option can be configured in two ways:

1. Setting a COMPOSE_PROFILES environment variable in dev/.env.dev. This allows you to avoid having to set COMPOSE_PROFILES for each make command you execute afterwards.
2. Passing in a COMPOSE_PROFILES argument when running make commands. For example:

make start COMPOSE_PROFILES=postgres,engine,grafana,rabbitmq

The possible profiles values are:

• grafana
• prometheus
• engine
• oncall_ui
• redis
• rabbitmq
• postgres
• mysql
• telegram_polling

The default is engine,oncall_ui,redis,grafana. This runs:

• all OnCall components (using SQLite as the database)
• Redis as the Celery message broker/cache
• a Grafana container

GRAFANA_IMAGE

If you would like to change the image or version of Grafana being run, simply pass in a GRAFANA_IMAGE environment variable to make start (or alternatively set it in your root .env file). The value of this environment variable should be a valid grafana image/tag combination (ex. grafana:main or grafana-enterprise:latest).

Configuring Grafana

This section is applicable for when you are running a Grafana container inside of docker-compose and you would like to modify your Grafana instance's provisioning configuration.

The following commands assume you run them from the root of the project:

touch ./dev/grafana.dev.ini
# make desired changes to ./dev/grafana.dev.ini then run
touch .env && ./dev/add_env_var.sh GRAFANA_DEV_PROVISIONING ./dev/grafana/grafana.dev.ini .env

For example, if you would like to enable the topnav feature toggle, you can modify your ./dev/grafana.dev.ini as such:

[feature_toggles]
enable = top_nav

The next time you start the project via docker-compose, the grafana container will have ./dev/grafana/grafana.dev.ini volume mounted inside the container.

Modifying Provisioning Configuration

Files under ./dev/grafana/provisioning are volume mounted into your Grafana container and allow you to easily modify the instance's provisioning configuration. See the Grafana docs here for more information.

Enabling RBAC for OnCall for local development

To run the project locally w/ RBAC for OnCall enabled, you will first need to run a grafana-enterprise container, instead of a grafana container. See the instructions here on how to do so.

Next, you will need to follow the steps here on setting up/downloading a Grafana Enterprise license.

Lastly, you will need to modify the instance's configuration. Follow the instructions here on how to do so. You can modify your configuration file (./dev/grafana.dev.ini) as such:

[rbac]
enabled = true

[feature_toggles]
enable = accessControlOnCall

[server]
root_url = https://<your-stack-slug>.grafana.net/

[enterprise]
license_text = <content-of-the-license-jwt-that-you-downloaded>

(Note: you may need to restart your grafana container after modifying its configuration)

Enabling OnCall prometheus exporter for local development

Add prometheus to your COMPOSE_PROFILES and set FEATURE_PROMETHEUS_EXPORTER_ENABLED=True in your dev/.env.dev file. You may need to restart your grafana container to make sure the new datasource is added (or add it manually using the UI; Prometheus will be running in host.docker.internal:9090 by default, using default settings).

Django Silk Profiling

In order to setup django-silk for local profiling, perform the following steps:

1. make backend-debug-enable
2. make engine-manage CMD="createsuperuser" - follow CLI prompts to create a Django superuser
3. Visit http://localhost:8080/django-admin and login using the credentials you created in step #2

You should now be able to visit http://localhost:8080/silk/ and see the Django Silk UI. See the django-silk documentation here for more information.

Running backend services outside Docker

By default everything runs inside Docker. If you would like to run the backend services outside of Docker (for integrating w/ PyCharm for example), follow these instructions:

1. Create a Python 3.11 virtual environment using a method of your choosing (ex. venv or pyenv-virtualenv). Make sure the virtualenv is "activated".

2. postgres is a dependency on some of our Python dependencies (notably psycopg2 (docs)). Please visit here for installation instructions.

3. make backend-bootstrap - installs all backend dependencies

4. Modify your .env.dev by copying the contents of one of .env.mysql.dev, .env.postgres.dev, or .env.sqlite.dev into .env.dev (you should exclude the GF_ prefixed environment variables).

   In most cases where you are running stateful services via docker-compose, and backend services outside of docker, you will simply need to change the database host to localhost (or in the case of sqlite update the file-path to your sqlite database file). You will need to change the broker host to localhost as well.

5. make backend-migrate - runs necessary database migrations

6. Open two separate shells and then run the following:

• make run-backend-server - runs the HTTP server
• make run-backend-celery - runs Celery workers

UI E2E Tests

We've developed a suite of "end-to-end" integration tests using Playwright. These tests are run on pull request CI builds. New features should ideally include a new/modified integration test.

To run these tests locally simply do the following:

1. Install Playwright dependencies with npx playwright install
2. Launch the environment
3. Then you interact with tests in 2 different ways:
   1. Using Tilt - open E2eTests section where you will find 4 buttons:
      1. Restart headless run (you can configure browsers, reporter and failure allowance there)
      2. Open watch mode
      3. Show last HTML report
      4. Stop (stops any pending e2e test process)
   2. Using make:
      1. make test:e2e to start headless run
      2. make test:e2e:watch to open watch mode
      3. make test:e2e:show:report to open last HTML report

Helm unit tests

To run the helm unit tests you will need the following dependencies installed:

• helm - installation instructions
• helm-unittest plugin - installation instructions

Then you can simply run

make test-helm

Useful make commands

🚶‍This part was moved to make help command. Run it to see all the available commands and their descriptions

Setting environment variables

If you need to override any additional environment variables, you should set these in a root .env.dev file. This file is automatically picked up by the OnCall engine Docker containers. This file is ignored from source control and also overrides any defaults that are set in other .env* files

Slack application setup

For Slack app configuration check our docs: https://grafana.com/docs/oncall/latest/open-source/#slack-setup

Update drone build

The .drone.yml build file must be signed when changes are made to it. Follow these steps:

If you have not installed drone CLI follow these instructions

To sign the .drone.yml file:

export DRONE_SERVER=https://drone.grafana.net

# Get your drone token from https://drone.grafana.net/account
export DRONE_TOKEN=<Your DRONE_TOKEN>

drone sign --save grafana/oncall .drone.yml

Troubleshooting

ld: library not found for -lssl

Problem:

make backend-bootstrap
...
    ld: library not found for -lssl
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'gcc' failed with exit status 1
...

Solution:

export LDFLAGS=-L/usr/local/opt/openssl/lib
make backend-bootstrap

Could not build wheels for cryptography which use PEP 517 and cannot be installed directly

Happens on Apple Silicon

Problem:

build/temp.macosx-12-arm64-3.9/_openssl.c:575:10: fatal error: 'openssl/opensslv.h' file not found
#include <openssl/opensslv.h>
          ^~~~~~~~~~~~~~~~~~~~
1 error generated.
error: command '/usr/bin/clang' failed with exit code 1
----------------------------------------
ERROR: Failed building wheel for cryptography

Solution:

LDFLAGS="-L$(brew --prefix openssl@1.1)/lib" CFLAGS="-I$(brew --prefix openssl@1.1)/include" pip install `cat engine/requirements.txt | grep cryptography`

django.db.utils.OperationalError: (1366, "Incorrect string value")

Problem:

django.db.utils.OperationalError: (1366, "Incorrect string value: '\\xF0\\x9F\\x98\\x8A\\xF0\\x9F...' for column 'cached_name' at row 1")

Solution:

Recreate the database with the correct encoding.

/bin/sh: line 0: cd: grafana-plugin: No such file or directory

Problem:

When running make init:

/bin/sh: line 0: cd: grafana-plugin: No such file or directory
make: *** [init] Error 1

This arises when the environment variable [CDPATH](https://www.theunixschool.com/2012/04/what-is-cdpath.html) is set and when the current path (.) is not explicitly part of CDPATH.

Solution:

Either make . part of CDPATH in your .rc file setup, or temporarily override the variable when running make commands:

$ CDPATH="." make init
# Setting CDPATH to empty seems to also work - only tested on zsh, YMMV
$ CDPATH="" make init

Problem:

When running make init start:

Error response from daemon: open /var/lib/docker/overlay2/ac57b871108ee1b98ff4455e36d2175eae90cbc7d4c9a54608c0b45cfb7c6da5/committed: is a directory
make: *** [start] Error 1

Solution: clear everything in docker by resetting or:

make cleanup

Encountered error while trying to install package - grpcio

Problem:

We are currently using a library, fcm-django, which has a dependency on grpcio. Google does not provide grpcio wheels built for Apple Silicon Macs. The best solution so far has been to use a conda virtualenv. There's apparently a lot of community work put into making packages play well with M1/arm64 architecture.

pip install -r requirements.txt
...
   note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> grpcio
...

Solution:

Use a conda virtualenv, and then run the following when installing the engine dependencies/ See here for more details

GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=1 GRPC_PYTHON_BUILD_SYSTEM_ZLIB=1 pip install -r requirements.txt

distutils.errors.CompileError: command '/usr/bin/clang' failed with exit code 1

See solution for "Encountered error while trying to install package - grpcio" here

symbol not found in flat namespace '_EVP_DigestSignUpdate'

Problem:

This problem seems to occur when running the Celery process, outside of docker-compose (via make run-backend-celery), and using a conda virtual environment.

conda create --name oncall-dev python=3.9.13
conda activate oncall-dev
make backend-bootstrap
make run-backend-celery
File "~/oncall/engine/engine/__init__.py", line 5, in <module>
    from .celery import app as celery_app
  File "~/oncall/engine/engine/celery.py", line 11, in <module>
    from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter
  File "/opt/homebrew/Caskroom/miniconda/base/envs/oncall-dev/lib/python3.9/site-packages/opentelemetry/exporter/otlp/proto/grpc/trace_exporter/__init__.py", line 20, in <module>
    from grpc import ChannelCredentials, Compression
  File "/opt/homebrew/Caskroom/miniconda/base/envs/oncall-dev/lib/python3.9/site-packages/grpc/__init__.py", line 22, in <module>
    from grpc import _compression
  File "/opt/homebrew/Caskroom/miniconda/base/envs/oncall-dev/lib/python3.9/site-packages/grpc/_compression.py", line 20, in <module>
    from grpc._cython import cygrpc
ImportError: dlopen(/opt/homebrew/Caskroom/miniconda/base/envs/oncall-dev/lib/python3.9/site-packages/grpc/_cython/cygrpc.cpython-39-darwin.so, 0x0002): symbol not found in flat namespace '_EVP_DigestSignUpdate'

Solution:

This solution posted in a GitHub issue thread for the grpc/grpc repository, fixes the issue:

conda install grpcio
make run-backend-celery

IDE Specific Instructions

PyCharm

1. Follow the instructions listed in "Running backend services outside Docker".
2. Open the project in PyCharm
3. Settings → Project OnCall
   • In Python Interpreter click the gear and create a new Virtualenv from existing environment selecting the venv created in Step 1.
   • In Project Structure make sure the project root is the content root and add /engine to Sources
4. Under Settings → Languages & Frameworks → Django
   • Enable Django support
   • Set Django project root to /engine
   • Set Settings to settings/dev.py
5. Create a new Django Server run configuration to Run/Debug the engine
   • Use a plugin such as EnvFile to load the .env.dev file
   • Change port from 8000 to 8080

How to write database migrations

We use django-migration-linter to keep database migrations backwards compatible

• we can automatically run migrations and they are zero-downtime, e.g. old code can work with the migrated database
• we can run and rollback migrations without worrying about data safety
• OnCall is deployed to the multiple environments core team is not able to control

See django-migration-linter checklist for the common mistakes and best practices

Removing a nullable field from a model

This only works for nullable fields (fields with null=True in the field definition).

DO NOT USE THIS APPROACH FOR NON-NULLABLE FIELDS, IT CAN BREAK THINGS!

1. Remove all usages of the field you want to remove. Make sure the field is not used anywhere, including filtering, querying, or explicit field referencing from views, models, forms, serializers, etc.

2. Remove the field from the model definition.

3. Generate migrations using the following management command:

   python manage.py remove_field <APP_LABEL> <MODEL_NAME> <FIELD_NAME>
   

   Example: python manage.py remove_field alerts AlertReceiveChannel restricted_at

   This command will generate two migrations that MUST BE DEPLOYED IN TWO SEPARATE RELEASES:

   • Migration #1 will remove the field from Django's state, but not from the database. Release #1 must include migration #1, and must not include migration #2.
   • Migration #2 will remove the field from the database. Stash this migration for use in a future release.

4. Make release #1 (removal of the field + migration #1). Once released and deployed, Django will not be aware of this field anymore, but the field will be still present in the database. This allows for a gradual migration, where the field is no longer used in new code, but still exists in the database for backward compatibility with old code.

5. In any subsequent release, include migration #2 (the one that removes the field from the database).

6. After releasing and deploying migration #2, the field will be removed both from the database and Django state, without backward compatibility issues or downtime 🎉

Autogenerating TS types based on OpenAPI schema

⚠️ WARNING
Transition to this approach is in progress

Overview

In order to automate types creation and prevent API usage pitfalls, OnCall project is using the following approach:

1. OnCall Engine (backend) exposes OpenAPI schema
2. OnCall Grafana Plugin (frontend) autogenerates TS type definitions based on it
3. OnCall Grafana Plugin (frontend) uses autogenerated types as a single source of truth for any backend-related interactions (url paths, request bodies, params, response payloads)

Instruction

1. Whenever API contract changes, run yarn generate-types from grafana-plugin directory

2. Then you can start consuming types and you can use fully typed http client:

   import { ApiSchemas } from "network/oncall-api/api.types";
   import { onCallApi } from "network/oncall-api/http-client";
   
   const {
     data: { results },
   } = await onCallApi().GET("/alertgroups/");
   const alertGroups: Array<ApiSchemas["AlertGroup"]> = results;
   

3. [Optional] If there is any property that is not yet exposed in OpenAPI schema and you already want to use it, you can append missing properties to particular schemas by editing grafana-plugin/src/network/oncall-api/types-generator/custom-schemas.ts file:

   export type CustomApiSchemas = {
     Alert: {
       propertyMissingInOpenAPI: string;
     };
     AlertGroup: {
       anotherPropertyMissingInOpenAPI: number[];
     };
   };
   

   Then add their names to CUSTOMIZED_SCHEMAS array in grafana-plugin/src/network/oncall-api/types-generator/generate-types.ts:

   const CUSTOMIZED_SCHEMAS = ["Alert", "AlertGroup"];
   

   The outcome is that autogenerated schemas will be modified as follows:

   import type { CustomApiSchemas } from './types-generator/custom-schemas';
   
   export interface components {
       schemas: {
           Alert: CustomApiSchemas['Alert'] & {
               readonly id: string;
               ...
           };
           AlertGroup: CustomApiSchemas['AlertGroup'] & {
               readonly pk: string;
               ...
           },
           ...
       }
   }
   

System components

flowchart TD
    client[Monitoring System]
    third_party["Slack, Twilio, 
           3rd party services.."]
    server[Server]
    celery[Celery Worker]
    db[(SQL Database)]
    redis[("Cache
            (Redis)")]
    broker[("AMPQ Broker
             (Redis or RabbitMQ)")]
    
    subgraph OnCall Backend
    server <--> redis
    server <--> db
    server -->|"Schedule tasks 
                with ETA"| broker
    broker -->|"Fetch tasks"| celery
    celery --> db

    end
    subgraph Grafana Stack
    plugin["OnCall Frontend 
            Plugin"]
    proxy[Plugin Proxy]
    api[Grafana API]
    plugin --> proxy --> server
    api --> server
    end

    client -->|Alerts| server
    third_party -->|"Statuses, 
               events"| server
    celery -->|"Notifications, 
                Outgoing Webhooks"| third_party