Introduction
The SCM (Source Code Management) platform is a vendor-agnostic abstraction layer for interacting with source code management service-providers such as GitHub, GitLab, and Bitbucket. It decouples Sentry's product features from service-provider-specific APIs by presenting a single, declarative interface for both reading and writing SCM resources and for reacting to SCM webhook events.
Goals
- Service-provider independence. Product code should never import a service-provider's client or parse a service-provider's response format directly. All interactions should flow through a common interface. Adding new service-providers should not require changes to existing implementations.
- Declarative usage. Callers should describe what they want (e.g. "create a pull request") not how to accomplish it. Initialization, authentication, rate limiting, and response mapping are handled internally.
- Centrally enforced access controls. Access controls must be strictly and consistently enforced across all SCM service-providers to prevent unprivileged access to sensitive customer data. The security model should be implemented once and applied universally.
- Observable. Every outbound action and every inbound webhook listener automatically records success/failure metrics, emits traces, and reports errors and logs to Sentry. The health of the SCM platform should always be knowable.
- Extensible. The SCM platform should be maximally and trivially extensible. As core infrastructure it should mutate as business needs change and not ossify a particular implementation.
Features
The platform exposes three subsystems:
- Actions — outbound SCM operations initiated by Sentry code. The
SourceCodeManagerclass provides 70+ methods covering comments, reactions, pull requests, branches, git objects, reviews, and check runs. With more actions planned to be added as we port more use cases. - Actions RPC - outbound SCM commands exposed over the network. The
SourceCodeManageris fully available over the network. This enables usage of the SCM for services outside the monolith. - Event Stream — inbound webhook processing. SCM service-providers push events which are deserialized into typed, provider-neutral dataclasses (
CheckRunEvent,CommentEvent,PullRequestEvent) which are then dispatched to registered listener functions.
Why
Ad-hoc usage of a SCM service-provider's API client tightly couples your application code to that provider. Ad-hoc management of access controls increases Sentry's security vulnerability surface area (specifically IDOR vulnerabilities). And ad hoc use of API clients can lead to resource exhaustion, starving critical product features of quota without consideration.
You should not need to care about any of these things. These problems should be solved once and managed for you. It should be impossible for you to perform an action which violates a security boundary. It should be impossible for your usage of the SCM to break another feature's SLO. The less you have to think about, the more you can focus on solving the business case.
The SCM solves all the problems you don't want to care about.
Getting Started
We have extensive documentation both inline in the Sentry codebase and on the Sentry developer documentation portal. If you're interested in expanding your SCM usage or in enabling new service-providers for a limited amount of effort take a took at the SCM platform.
Releasing a New Version
- On the
getsentry/scm-platformrepository page click the Actions tab. - On the left-hand side click the release workflow.
- Click Run workflow, choose a bump type (
patch,minor, ormajor), and run it. The next version is calculated automatically from the current version inpyproject.toml. - The workflow will create a release branch and PR via
getsentry/action-prepare-release. After completion it will return a URL to an issue ongetsentry/publish. - On the
getsentry/publishissue immediately set the accepted label. - A pull request will be opened on
getsentry/pypi. - Edit the file in GitHub and place
python>=3.13on the line immediately following the changed line. - The PR will merge automatically. When it's merged your new version is available for use.
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