grpc 101 - devfest belgium 2016

GRPC 101by Alex Van Boxel (@alexvb)

Alex Van BoxelSoftware Architect @ Vente-Exclusive.com

Google Cloud Developer Expert

http://www.grpc.io/

AgendaGRPC introductionGRPC demoGRPC deep dive

Remember RPC

History: CobraSpec # pages

Part 1: CORBA Interfaces 532

Part 2: CORBA Interoperability 236

Part 3: CORBA Component Model 380

History: DCOMOh, my... If you think COM is scary...

D-COM

History: RMIQuite OK... but interop?!

History: SOAPInterop, but XML

Sooo, slow

WS-* (dead-star)

RESTResource Oriented

JSON over REST

Successful model

So why RPC again?!

Microservices

GRPC Remote ProcedureCall

GRPC@google everything build with RPC

Comes from 4 generations of RPC

Stubby 1,2,3

10^10 RPC calls per second

Google and Square

SimplePerformant and ScalableInteroperable and Extensible

Protobuffer 3IDLHTTP/2

Protocol BufferStructured representation of Data

IDL: Interface Defenition Language

Binary format

Well-Know Types

Proto: Code Generation

Proto: LanguagesJava, C++, Node.JS, Ruby, Python, ObjectiveC, Go, PHP

Proto: Messagessyntax = "proto3";

message SearchRequest { string query = 1; int32 page_number = 2; int32 result_per_page = 3; }

Proto: Servicesservice SearchService { rpc Search (SearchRequest) returns (SearchResponse); }

Proto: Optionspackage grpc.health.v1; option csharp_namespace = "Grpc.Health.V1";

option java_multiple_files = true; option java_package = "io.grpc.health.v1"; option java_outer_classname = "HealthProto";

HTTP/2

HTTP/2Binary

Multiplexing

HTTP/1 vs HTTP/2

HTTP/2Binary

Multiplexing

Secure

HTTP/1 TLS keys

HTTP/2Binary

Multiplexing

Secure

Streaming

HTTP/2: StreamingServer Side Streaming

Client Side Streaming

Bi-Directional Streaminf

Standard ErrorsGRPC_STATUS_CANCELLED Client application

cancelled therequest

GRPC_STATUS_DEADLINE_EXCEEDED Deadline expiredbefore serverreturned status

GRPC_STATUS_RESOURCE_EXHAUSTED Flow-controlresource limitsreached

GRPC_STATUS_UNAUTHENTICATED Unauthenticated:credentials failedto get metadata

GRPC_STATUS_CANCELLED Client applicationcancelled therequest

...

HTTP not to be confused...Semantics, no it's not REST

You won't �nd the GET/POST/DELETE/PATCH

Not everything is a resource

Code session

Gravity RPC

GRPC: Unique Features

ExtensibleFrom the ground up

Extensible

Binding through Context

Context

Deadlines

Cancel

Versioning Strategies

Versioningmessage Blip { google.protobuf.Timestamp timestamp = 1; BlipType blip_type = 2; Coordinate coordinate = 3; Planet planet = 4; Missle missle = 5; }

Proto message �elds are tagged

Versioningmessage Blip { google.protobuf.Timestamp timestamp = 1; BlipType blip_type = 2; Coordinate coordinate = 3; Planet planet = 4; Missle missle = 5; Base base = 6; }

Extend messages by adding unique tags

Versioningmessage Blip { google.protobuf.Timestamp timestamp = 1; BlipType blip_type = 2; Coordinate coordinate = 3; Planet planet = 4; Base base = 6;

reserved 5; reserved "missle" }

Reserve �eld names and tags for deprecation

Versioningpackage grpc.health.v1; option csharp_namespace = "Grpc.Health.V1";

option java_multiple_files = true; option java_package = "io.grpc.health.v1"; option java_outer_classname = "HealthProto";

Using package names to introduce big changes

First Class Microservice ProtocolSimplePerformant and ScalableInteroperable and ExtensibleLanguage Support

http://www.grpc.io/

Q & AGRPC 101

by Alex Van Boxel(@alexvb)