Pedestal

Pedestal is a set of libraries written in Clojure that aims to bring both the language and its principles (Simplicity, Power and Focus) to server-side development.

Pedestal requires Java 1.8+ and Servlet 3.1

Getting the Latest Release

Leiningen dependencies:

[io.pedestal/pedestal.service       "0.5.8"]
[io.pedestal/pedestal.service-tools "0.5.8"] ;; Only needed for ns-watching; WAR tooling
[io.pedestal/pedestal.jetty         "0.5.8"]
[io.pedestal/pedestal.immutant      "0.5.8"]
[io.pedestal/pedestal.tomcat        "0.5.8"]
[io.pedestal/pedestal.aws           "0.5.8"] ;; API-Gateway, Lambda, and X-Ray support

You can also use Pedestal's internal modules standalone

[io.pedestal/pedestal.log         "0.5.8"] ;; Logging and runtime metrics
[io.pedestal/pedestal.interceptor "0.5.8"] ;; The Interceptor chain and the Interceptor API
[io.pedestal/pedestal.route       "0.5.8"] ;; Efficient routing algorithms and data structures

Please see our Releases for version details, updates, and necessary migration steps.

Notable capabilities

• Fast and secure by default (automatically uses secure headers, CSRF-protection, and other best practices)
• A guiding principle of "data > functions > macros" - the core pieces of Pedestal are data-driven and programmed against protocols. The entire platform is extensible.
• A high-performance prefix-tree router that is significantly faster and more space efficient than other Clojure web routers
  • When avoiding wildcard and param-routes, the router will be O(log32 N), otherwise O(log N), for the number of routes
• The ability to plug-in any router, including one you write
• The ability to express routes in any format you like
• Full/true async support (Async Servlet + core.async + NIO), resulting in better performance and capacity than a synchronous-only solution
• Advanced error handling for async systems
• Integrated streaming capabilities like Server-sent events
• Integrated support for Cross-origin resource sharing/CORS
• Integrated support for content negotiation
• Integrated linking and testing tools
• Integrated logging and runtime metrics (which can be published to JMX, StatsD, Cloudwatch, and more)
• Integrated tracing with support for Open-Tracing, Jaeger, AWS X-Ray, and more.
• A fundamentally simple system (absolutely everything is an interceptor; interceptors compose)
• The ability to utilize Java Web technology directly in your service (Pedestal can integrate ServletFilters)
• The ability to utilize Ring Middleware as Pedestal Interceptors
• Support to run on Jetty, Immutant/Undertow, and Tomcat
• The ability to run Pedestal services on non-Servlet containers (Vert.x, nginx, Netty, etc.)
• HTTP/2, HTTP/2 Cleartext, and ALPN support
• WebSocket support
• Docker and OSv support
• and more!

Getting started

Starting a new project

Use leiningen (2.2.0+) to create a new Pedestal service. This will automatically pull templates from http://clojars.org

# To create a new service:
lein new pedestal-service the-next-big-server-side-thing

See the samples or Pedestal.io docs site for information on Pedestal, including:

• Getting started tutorial and other guides
• Main concepts
• Advanced usage
• API docs
• Reference docs

Digging deeper

Roadmap

Our primary focus for the near future is Pedestal documentation, sample applications and improving general ease of use.

Pedestal's roadmap gets captured within the GitHub issues.

Documentation

• Pedestal documentation
  • Older docs are coupled within this repository - some may be outdated.
• The latest API Docs.
• Build your own API docs with lein sub install; lein docs

Supported Platforms

At present Pedestal supports OSX and Linux environments. At this time we do not support using Pedestal on a Windows environment.

Some good news: We will still gladly accept pull requests extending our Windows support

The bad news: We will not invest significant amounts of time into diagnosing or correcting Windows issues.

Find out more

• Follow @pedestal_team on Twitter
• Subscribe to pedestal-users and pedestal-dev

Looking for Pedestal App?

• Pedestal App now lives in its own github repo.
• Please see the community announcement discontinuing "App" for more details.

Contributing

See CONTRIBUTING.md for details on contributing to Pedestal.

Installing Libraries

To install Pedestal library components in your local Maven repository run lein sub install from a local checkout of this repository.

Running the tests

After installing all the library components, you can run the tests with lein sub test from a local checkout of this repository. The majority of the tests are in the service directory

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License

Copyright 2013 Relevance, Inc.

Copyright 2014-2020 Cognitect, Inc.

The use and distribution terms for this software are covered by the Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0) which can be found in the file epl-v10.html at the root of this distribution.

By using this software in any fashion, you are agreeing to be bound by the terms of this license.

You must not remove this notice, or any other, from this software.