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205 lines
9.4 KiB
Markdown
205 lines
9.4 KiB
Markdown
# Hasura GraphQL Engine
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[](https://docs.hasura.io)
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[](https://circleci.com/gh/hasura/graphql-engine)
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<a href="https://discord.gg/3FNQnWj"><img src="https://img.shields.io/badge/chat-discord-brightgreen.svg?logo=discord&style=flat"></a>
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<a href="https://twitter.com/intent/follow?screen_name=HasuraHQ"><img src="https://img.shields.io/badge/Follow-HasuraHQ-blue.svg?style=flat&logo=twitter"></a>
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<a href="https://eepurl.com/dBUfJ5"><img src="https://img.shields.io/badge/newsletter-subscribe-yellow.svg?style=flat"></a>
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Hasura GraphQL Engine is a blazing-fast GraphQL server that gives you **instant, realtime GraphQL APIs over Postgres**, with [**webhook triggers**](event-triggers.md) on database events, and [**remote schemas**](remote-schemas.md) for business logic.
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Hasura helps you build GraphQL apps backed by Postgres or incrementally move to GraphQL for existing applications using Postgres.
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Read more at [hasura.io](https://hasura.io) and the [docs](https://docs.hasura.io).
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------------------
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------------------
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-------------------
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## Features
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* **Make powerful queries**: Built-in filtering, pagination, pattern search, bulk insert, update, delete mutations
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* **Realtime**: Convert any GraphQL query to a live query by using subscriptions
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* **Merge remote schemas**: Access custom GraphQL schemas for business logic via a single GraphQL Engine endpoint. [**Read more**](remote-schemas.md).
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* **Trigger webhooks or serverless functions**: On Postgres insert/update/delete events ([read more](event-triggers.md))
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* **Works with existing, live databases**: Point it to an existing Postgres database to instantly get a ready-to-use GraphQL API
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* **Fine-grained access control**: Dynamic access control that integrates with your auth system (eg: auth0, firebase-auth)
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* **High-performance & low-footprint**: ~15MB docker image; ~50MB RAM @ 1000 req/s; multi-core aware
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* **Admin UI & Migrations**: Admin UI & Rails-inspired schema migrations
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* **Postgres** ❤️: Supports Postgres types (PostGIS/geo-location, etc.), turns views to *graphs*, trigger stored functions or procedures with mutations
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Read more at [https://hasura.io](https://hasura.io) and the [docs](https://docs.hasura.io).
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## Table of contents
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<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
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**Table of Contents**
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- [Quickstart:](#quickstart)
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- [One-click deployment on Heroku](#one-click-deployment-on-heroku)
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- [Other deployment methods](#other-deployment-methods)
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- [Architecture](#architecture)
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- [Client-side tooling](#client-side-tooling)
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- [Add business logic](#add-business-logic)
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- [Remote schemas](#remote-schemas)
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- [Trigger webhooks on database events](#trigger-webhooks-on-database-events)
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- [Demos](#demos)
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- [Realtime applications](#realtime-applications)
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- [Videos](#videos)
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- [Support & Troubleshooting](#support--troubleshooting)
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- [Contributing](#contributing)
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- [Brand assets](#brand-assets)
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- [License](#license)
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<!-- markdown-toc end -->
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## Quickstart:
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### One-click deployment on Heroku
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The fastest way to try Hasura out is via Heroku.
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1. Click on the following button to deploy GraphQL Engine on Heroku with the free Postgres add-on:
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[](https://heroku.com/deploy?template=https://github.com/hasura/graphql-engine-heroku)
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2. Open the Hasura console
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Visit `https://<app-name>.herokuapp.com` (*replace \<app-name\> with your app name*) to open the admin console.
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3. Make your first GraphQL query
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Create a table and instantly run your first query. Follow this [simple guide](https://docs.hasura.io/1.0/graphql/manual/getting-started/first-graphql-query.html).
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### Other deployment methods
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For Docker-based deployment and advanced configuration options, see [deployment
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guides](https://docs.hasura.io/1.0/graphql/manual/getting-started/index.html) or
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[install manifests](install-manifests).
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## Architecture
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The Hasura GraphQL Engine fronts a Postgres database instance and can accept GraphQL requests from your client apps. It can be configured to work with your existing auth system and can handle access control using field-level rules with dynamic variables from your auth system.
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You can also merge remote GraphQL schemas and provide a unified GraphQL API.
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## Client-side tooling
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Hasura works with any GraphQL client. We recommend using [Apollo Client](https://github.com/apollographql/apollo-client). See [awesome-graphql](https://github.com/chentsulin/awesome-graphql) for a list of clients.
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## Add business logic
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GraphQL Engine provides easy-to-reason, scalable and performant methods for adding custom business logic to your backend:
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### Remote schemas
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Add custom resolvers in a remote schema in addition to Hasura's Postgres-based GraphQL schema. Ideal for use-cases like implementing a payment API, or querying data that is not in your database - [read more](remote-schemas.md).
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### Trigger webhooks on database events
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Add asynchronous business logic that is triggered based on database events.
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Ideal for notifications, data-pipelines from Postgres or asynchronous
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processing - [read more](event-triggers.md).
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### Derived data or data transformations
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Transform data in Postgres or run business logic on it to derive another dataset that can be queried using GraphQL Engine - [read more](https://docs.hasura.io/1.0/graphql/manual/business-logic/index.html).
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## Demos
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Check out all the example applications in the
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[community/examples](community/examples) directory.
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### Realtime applications
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- Group Chat application built with React, includes a typing indicator, online users & new
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message notifications.
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- [Try it out](https://realtime-chat.demo.hasura.app/)
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- [Tutorial](community/examples/realtime-chat)
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- [Browse APIs](https://realtime-chat.demo.hasura.app/console)
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- Live location tracking app that shows a running vehicle changing current GPS
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coordinates moving on a map.
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- [Try it out](https://realtime-location-tracking.demo.hasura.app/)
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- [Tutorial](community/examples/realtime-location-tracking)
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- [Browse APIs](https://realtime-location-tracking.demo.hasura.app/console)
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- A realtime dashboard for data aggregations on continuously changing data.
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- [Try it out](https://realtime-poll.demo.hasura.app/)
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- [Tutorial](community/examples/realtime-poll)
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- [Browse APIs](https://realtime-poll.demo.hasura.app/console)
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### Videos
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* [Add GraphQL to a self-hosted GitLab instance](https://www.youtube.com/watch?v=a2AhxKqd82Q) (*3:44 mins*)
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* [Todo app with Auth0 and GraphQL backend](https://www.youtube.com/watch?v=15ITBYnccgc) (*4:00 mins*)
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* [GraphQL on GitLab integrated with GitLab auth](https://www.youtube.com/watch?v=m1ChRhRLq7o) (*4:05 mins*)
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* [Dashboard for 10million rides with geo-location (PostGIS, Timescale)](https://www.youtube.com/watch?v=tsY573yyGWA) (*3:06 mins*)
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## Support & Troubleshooting
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The documentation and community will help you troubleshoot most issues. If you have encountered a bug or need to get in touch with us, you can contact us using one of the following channels:
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* Support & feedback: [Discord](https://discord.gg/3FNQnWj)
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* Issue & bug tracking: [GitHub issues](https://github.com/hasura/graphql-engine/issues)
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* Follow product updates: [@HasuraHQ](https://twitter.com/hasurahq)
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* Talk to us on our [website chat](https://hasura.io)
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We are committed to fostering an open and welcoming environment in the community. Please see the [Code of Conduct](code-of-conduct.md).
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If you want to report a security issue, please [read this](SECURITY.md).
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## Contributing
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Check out our [contributing guide](CONTRIBUTING.md) for more details.
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## Brand assets
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Hasura brand assets (logos, the Hasura mascot, powered by badges etc.) can be
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found in the [assets/brand](assets/brand) folder. Feel free to use them in your
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application/website etc. We'd be thrilled if you add the "Powered by Hasura"
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badge to your applications built using Hasura. ❤️
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<div style="display: flex;">
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<img src="assets/brand/powered_by_hasura_black.svg" width="150px"/>
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<img src="assets/brand/powered_by_hasura_white.svg" width="150px"/>
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</div>
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```html
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<!-- For light backgrounds -->
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<a href="https://hasura.io">
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<img width="150px" src="https://graphql-engine-cdn.hasura.io/img/powered_by_hasura_black.svg" />
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</a>
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<!-- For dark backgrounds -->
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<a href="https://hasura.io">
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<img width="150px" src="https://graphql-engine-cdn.hasura.io/img/powered_by_hasura_white.svg" />
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</a>
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```
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## License
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The core GraphQL Engine is available under the [GNU Affero General Public
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License v3](https://www.gnu.org/licenses/agpl-3.0.en.html) (AGPL-3.0). We have
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written more about what you can and cannot do under AGPL
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[here](https://github.com/hasura/graphql-engine/wiki/License-Explained).
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**Commercial licenses** that bundle the Hasura GraphQL Engine with support and
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SLAs are available on request. Please feel free to contact us at build@hasura.io
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or on our [website chat](https://hasura.io).
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All **other contents** (except those in [`server`](server), [`cli`](cli) and
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[`console`](console) directories) are available under the [MIT License](LICENSE-community).
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This includes everything in the [`docs`](docs) and [`community`](community)
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directories.
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