xebia/grpc

Name: grpc

Owner: Xebia BV

Description: Tech Rally 2017-01-27

Created: 2017-01-27 08:49:38.0

Updated: 2017-01-27 19:54:26.0

Pushed: 2017-01-30 14:07:58.0

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Size: 156

Language: Java

GitHub Committers

User	Most Recent Commit	# Commits

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README

TechRally: gRPC

Topic: gRPC (Google RPC)

More information on https://grpc.io.

Participants

• Albert
• Barend
• Jesse
• Peter
• Stijn

Motivation

Barend: JSON is a nic(h)e file format for talking to web browsers. It (and REST) are being overused as much as XML in its heyday. It's a schemaless mess. For communication between web services, pretty much everything ? including XML ? is superior. Let's look at gRPC, which uses protobuf as the message format and HTTP2 as the network protocol.

Goals

• Investigate alternative to JSON for intra-microservices communication. (Barend)
• Investigate schema migration (Peter)
• Use a monorepo and maybe use PantsBuild (Barend)
• Use Python and Java bindings (Barend)
• Use with React Native (Albert)
• Use with iOS (Stijn)

Implementation

Components

The client invokes a BMI microservice, which relies on height and weight services.

Client <-gRPC-> User BMI Service <-gRPC-> User Height Service
                                 <-gRPC-> User Weight Service

Domain Model

All three services take a string for input, and return a float.

• User Weight Service: string to float (kilograms)
• User Height Service: string to float (meters)
• User BMI Service: string to float (BMI)

Implementations

The implementations have their own README file with instructions for use.

Client

• Python commandline (known working) in folder pybmi/
• iOS Native (status unknown) in folder ios/
• React Native for Android and iOS (status unknown) in folder react-native/

BMI Service

• Java (known working) in folder userbmi/
• Python (known working) in folder pybmi/

Height Service

• Java (known working) in folder userheight/

Weight Service

• Python (known working) in folder userweight/

Further work

Some other stuff I'd like to figure out:

• Make the iOS and React Native clients work with the latest service.
• Use a common build system for all modules: Pants or Buck.
• Use content type negotation on the external facing endpoint to support JSON as well as Protobuf.
• Implement a service in Go.