Pingora

What is Pingora

Pingora is a Rust framework to build fast, reliable and programmable networked systems.

Pingora is battle tested as it has been serving more than 40 million Internet requests per second for more than a few years.

Feature highlights

• Async Rust: fast and reliable
• HTTP 1/2 end to end proxy
• TLS over OpenSSL or BoringSSL
• gRPC and websocket proxying
• Graceful reload
• Customizable load balancing and failover strategies
• Support for a variety of observability tools

Reasons to use Pingora

• Security is your top priority: Pingora is a more memory safe alternative for services that are written in C/C++
• Your service is performance-sensitive: Pingora is fast and efficient
• Your service requires extensive customization: The APIs Pingora proxy framework provides are highly programmable

Getting started

See our quick starting guide to see how easy it is to build a load balancer.

Our user guide covers more topics such as how to configure and run Pingora servers, as well as how to build custom HTTP servers and proxy logic on top of Pingora's framework.

API docs are also available for all the crates.

Notable crates in this workspace

• Pingora: the "public facing" crate to build networked systems and proxies
• Pingora-core: this crate defines the protocols, functionalities and basic traits
• Pingora-proxy: the logic and APIs to build HTTP proxies
• Pingora-error: the common error type used across Pingora crates
• Pingora-http: the HTTP header definitions and APIs
• Pingora-openssl & pingora-boringssl: SSL related extensions and APIs
• Pingora-ketama: the Ketama consistent algorithm
• Pingora-limits: efficient counting algorithms
• Pingora-load-balancing: load balancing algorithm extensions for pingora-proxy
• Pingora-memory-cache: Async in-memory caching with cache lock to prevent cache stampede
• Pingora-timeout: A more efficient async timer system
• TinyUfo: The caching algorithm behind pingora-memory-cache

System requirements

Systems

Linux is our tier 1 environment and main focus.

We will try our best for most code to compile for Unix environments. This is for developers and users to have an easier time developing with Pingora in Unix-like environments like macOS (though some features might be missing)

Both x86_64 and aarch64 architectures will be supported.

Rust version

Pingora keeps a rolling MSRV (minimum supported Rust version) policy of 6 months. This means we will accept PRs that upgrade the MSRV as long as the new Rust version used is at least 6 months old.

Our current MSRV is 1.72.

Contributing

Please see our contribution guidelines.

License

This project is Licensed under Apache License, Version 2.0.

lib.rs:

Generic connection pooling

The pool is optimized for high concurrency, high RPS use cases. Each connection group has a lock free hot pool to reduce the lock contention when some connections are reused and released very frequently.