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Building GitHub Bots / Apps ...and the bpmn.io pull request flow.

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GitHub Bot / App An application that consumes events (emitted by GitHub) and drives workflow via GitHub REST or GraphQL API.

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Examples Automate dependency update notifications Automate CI run scheduling Automate merged branch deletion Automate issue commenting / marking / closing Automate merging, once all required checks pass Rich user interaction via issues ...

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Flow User GitHub GitHub Bot UI action / Git Push Event (s) API Call(s) UI update / notification Event(s) API Call(s) And so on... User GitHub GitHub Bot

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Event Subscription via Web Hooks GitHub allows you to register web hooks, URLs that are being invoked once anything happens.

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Driving GitHub via API REST API (so 2017) or GraphQL API.

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Security Model Apps are authenticated by organization owners on a per-project level. Apps must declare consumed events and access to project and user resources on a fine grained level (i.e. read issues, write issue comments). Apps may impersonate users (to a certain extend) to perform actions on behalf of the user.

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Probot: A Framework to Build Apps Node app framework Easy setup (app registration) Bundles REST + GraphQL clients Features example apps/bots Apps can be mixed and matched under new identity

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Example 1: merge-me

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Example 2: waffle.io

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Deployment Any free / payed tier PaaS hosting service: Heroku Now ...

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