gRPC Overview
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gRPC is an open source RPC framework that makes it easy to build a distributed system across multiple languages. It uses HTTP/2 for transport, has features like streaming, load balancing and authentication built-in. It is used widely at Google and is now available open source with implementations in 10 languages. gRPC benefits from being layered on HTTP/2 for interoperability and has a pluggable architecture for advanced features like monitoring and proxies.
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gRPC Overview
- 1. Google confidential │ Do not distribute Google confidential │ Do not distribute gRPC: A multi-platform RPC system Louis Ryan 26th February 2016
- 2. Google confidential │ Do not distribute Microservices at Google ~O(1010 ) RPCs per second. Images by Connie Zhou
- 3. Open source on Github for C, C++, Java, Node.js, Python, Ruby, Go, C#, PHP, Objective-C gRPC core gRPC java
- 4. OVERVIEW
- 5. gRPC is ... Open Source RPC framework that makes it easy to build a heterogenous distributed system. ● Free as in beer! (and licensing) ● Based on HTTP/2 today (multiplexed, works with the Internet) ● Payload agnostic (we’ve implemented proto) ● Streaming & Flow-Controlled ● Designed for harsh environments (timeout, lameducking, load-balancing, cancellation, …) ● Support in 10 languages & first class mobile support ● Layered & Pluggable - Bring your own monitoring, auth, naming, load balancing ...
- 6. ● Core features and protocol are fully specified ● Rolled out for public Google APIs and widely used internally ○ Lots of mobile adoption ● Approaching 1.0 (GA) release in all languages ○ Stable APIs for key features ● Benefit of layering on top of HTTP/2 standard ○ Interoperability with 3rd party proxies, tools, libraries.. ○ WHATWG Fetch Project Status
- 9. message SubscribeRequest { string topic = 1; } message Event { string details = 1; } service Topics { rpc Subscribe(SubscribeRequest) returns (stream Event); } IDL (Interface definition language) Describe once and generate interfaces for any language. Data Model Structure of the request and response. Binary format for network transmission. Wire Format Protocol Buffers
- 10. ● Three complete stacks: C/C++, Java and Go. ● Other language implementations wrap C-Runtime libraries. ○ Hand-written wrappers to maintain language idioms ● Why wrap C? ○ Development costs & Implementation Consistency ○ Performance ○ Feature evolution ● Easy one line installation via packages e.g npm install grpc Implementation Details
- 11. USE CASES
- 12. Google confidential │ Do not distribute Use Cases Client-server communication Access Google Cloud Services Build distributed applications Images by Connie Zhou • In data-centers • In public/private cloud • Clients and servers across: • Mobile • Web • Cloud • Also • Embedded systems, IoT • From GCP • From Android and iOS devices • From everywhere else
- 13. HOW TO GET STARTED
- 14. ● Install ○ apt-get install protobuf-compiler ○ pip install grpcio ● Write the protos ● Use protoc to generate service interfaces, messages & stubs ● Implement services in server ● Client instantiates stub ● Test & Deploy Typical development workflow
- 15. ● Auth & Security - TLS [Mutual], Plugin auth mechanism (e.g. OAuth) ● Proxies - nghttp2, haproxy, Google LB, Nginx (in progress) ● Client-side load balancing - etcd, Zookeeper, Eureka, … ● Monitor & Trace - Zipkin, Google, DIY ● Mobile - Reconnect, QUIC ● Web - REST Adapter, WHATWG Fetch ● API Evolution - Protobuf, Versioning Advanced Deployment...
- 16. ARCHITECTURE
- 17. gRPC Core Http 2.0 SSL Code Generated API Planned in: C/C++, Java, GoApplication Layer Framework Layer Transport Layer Architecture: Native Implementation in Language
- 18. Generic Low Level API in C Python Code-Generated Language Idiomatic API Obj-C, C#, C++, ... Ruby PHPPython gRPC Core in C Http 2.0 SSL Language Bindings Code Generated Ruby PHP Obj-C, C#, C++,... Application Layer Framework Layer Transport Layer Architecture: Derived Stack
- 19. Wire Implementation across languages gRPC Core Http 2.0 SSL Code Generated API Auth Architecture and API Credentials API Auth-Credentials Implementation AuthPluginAPI
- 20. ● Generic mechanism for attaching metadata to requests and responses ● Built into the gRPC protocol - always available ● Plugin API to attach “bearer tokens” to requests for Auth ○ OAuth2 access tokens ○ OIDC Id Tokens ● Session state for specific Auth mechanisms is encapsulated in an Auth- credentials object Metadata and Auth
- 24. ROADMAP..sorta !
- 25. Initial Alpha Release Beta Release Stability, Easy installation, 1.0 release Q1 ‘16 Roadmap: Timeline Q2 ‘15 Q3 ‘15, Q4’15 Q1 ‘15 Q2 ‘16 Q3 16 Additional Alpha Releases Load balancing, Naming, Performance Debugging and Tracing, Browser support
- 26. Thank you! Thank you! Twitter: @grpcio Site: grpc.io Group: grpc-io@googlegroups.com