Protoc plugins for generating graphql schema

If you use micro-service architecture with grpc for backend and graphql api gateway for frontend you will find yourself repeating a lot of code for translating from one transport layer to another (which many times may be a source of bugs)

This repository aims to simplify working with grpc trough protocol buffers and graphql by generating code.

Install:

go install github.com/csharpru/go-proto-gql/protoc-gen-gql
go install github.com/csharpru/go-proto-gql/protoc-gen-gogqlgen
go install github.com/csharpru/go-proto-gql/protoc-gen-gqlgencfg

Usage Examples:

The protoc compiler expects to find plugins named proto-gen-<PLUGIN_NAME> on the execution $PATH. So first:

export PATH=${PATH}:${GOPATH}/bin

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--gql_out plugin will generate graphql files with extension .graphqls rather than go code which means it can be further used for any other language or framework.

Example:

protoc --gql_out=paths=source_relative:. -I=. -I=./example/ ./example/*.proto

If you still want to generate go source code instead of graphql then use http://github.com/99designs/gqlgen plugin, and map all the generated go types with all the generated graphql types. Luckily --gqlgencfg_out plugin does exactly this.

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--gqlgencfg_out plugin generates yaml configs that can be used further by the http://github.com/99designs/gqlgen library.

Example:

protoc --gqlgencfg_out=paths=source_relative:. -I=. -I=./example/ ./example/*.proto

The generated go code will work fine if you don't have any enums, oneofs or maps. For this purpose use --gogqlgen_out plugin.

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--gogqlgen_out plugin generates generates methods for implementing github.com/99designs/gqlgen/graphql.Marshaler and github.com/99designs/gqlgen/graphql.Unmarshaler interfaces. Now proto enums, oneofs and maps will work fine with graphql.

This plugin also creates convenience methods that will implement generated by the gqlgen MutationResolver and QueryResolver interfaces.

NOTE: to generate with gogo import add gogoimport=true as a parameter

Example:

protoc --gogqlgen_out=gogoimport=false,paths=source_relative:. -I=. -I=./example/ ./example/*.proto

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See /example folder for more examples.

TODO:

• Create a better implementation of maps and oneofs.
• Add comments from proto to gql for documentation purposes.
• Add more documentation.

Community:

I am one on this. Will be very glad for any contributions so feel free to create issues and forks.

License:

go-proto-gql is released under the Apache 2.0 license. See the LICENSE file for details.