webrpc is a design/schema-driven approach to writing backend servers for the Web. Write your server's
api interface in a schema format of RIDL or JSON,
and then run
webrpc-gen to generate the networking source code for your server and client apps. From the schema,
webrpc-gen will generate application base class types/interfaces, JSON encoders, and networking code. In doing
so, it's able to generate fully functioning and typed client libraries to communicate with your server. Enjoy
strongly-typed Web services and never having to write an API client library again.
Under the hood, webrpc is a Web service meta-protocol, schema and code-generator tool for simplifying the development of backend services for modern Web applications.
Current code-generation language targets:
Here is an example webrpc schema in RIDL format (a new documentation-like format introduced by webrpc)
webrpc = v1 name = your-app version = v0.1.0 message User - id: uint64 - username: string - createdAt?: timestamp service ExampleService - Ping() - Status() => (status: bool) - GetUserByID(userID: uint64) => (user: User) - IsOnline(user: User) => (online: bool) - ListUsers(q?: UsersQueryFilter) => (page: Page, users: User)
WebRPC is a design/schema-driven approach to writing backend servers. Write your server's
api interface in a schema format of RIDL or
JSON format and run
webrpc-gen to generate
source code for your target language.
For example, to generate webrpc server+client code -- run:
bin/webrpc-gen -schema=example.ridl -target=go -pkg=main -server -client -out=./example.gen.go
and see the generated
./example.gen.go file of types, server and client in Go. This is essentially
golang-basics example was built.
More example apps
- hello-webrpc-ts - webrpc service with Go server and Typescript webapp
- golang-basics - webrpc service with Go server and Go client
Writing a Web service / microservice takes a lot of work and time. There are many pieces to build -- designing the routes of your service, agreeing on conventions for the routes with your team, the request payloads, the response payloads, writing the actual server logic, routing the methods and requests to the server handlers, implementing the handlers, and then writing a client library for your desired language so it can speak to your Web service. Yikes, it's a lot of work. Want to add an additional field or handler? yea, you have to go through the entire cycle. And what about type-safety across the wire?
webrpc automates a lot the work for you. Now from a single webrpc schema file,
you can use the
webrpc-gen cli to generate source code for:
- Strongly-typed request / response data payloads for your target language
- Strongly-typed server interface and methods on the service, aka the RPC methods
- Complete client library to communicate with the web service
Design / architecture
webrpc services speak JSON, as our goals are to build services that communicate with webapps. We optimize for developer experience, ease of use and productivity when building backends for modern webapps. However, webrpc also works great for service<->service communication, but it won't be as fast as gRPC in that scenario, but I'd be surprised hear, for majority cases of cases, for this to be a bottleneck or costly tradeoff.
webrpc is heavily inspired by gRPC and Twirp. It is architecturally the same and has a similar workflow, but simpler. In fact, the webrpc schema is similar in design to protobuf, as in we have messages and rpc methods, but the type system is arguably more flexible and code-gen tooling is simpler. The webrpc schema is a documentation-like language for describing a server's api interface and the type system within is inspired by Go, Typescript and WASM.
Why have "Rails" and "Django" been such productive frameworks for writing webapps? And the answer we came to is that its productive because the server and client are the same program, running in the same process on the same computer. Rails/Django/others like it, when rendering client-state can just call a function in the same program, the client and the server are within the same domain and same state -- everything is a function-call away. Compare this to modern app development such as writing a React.js SPA or a native iOS mobile app, where the app speaks to an external API server with now the huge added effort to bridge data/runtime from one namespace (the app) to an entirely other namespace (the server). It's too much work and takes too much time, and is too brittle. There is a better way! instead of writing the code.. just generate it. If we generate all of the code to native objects in both app/server, suddenly, we can make a remote service once again feel like calling a method on the same program running on the same computer/process. Remote-Procedure-Call works!
Finally, we'd like to compare generated RPC services (gRPC/Twirp/webrpc/other) to the most common pattern to writing services by "making a RESTful API", where the machinery is similar to RPC services. Picture the flow of data when a client calls out to a server -- from a client runtime proxy-object, we encode that object, send it over the wire, the server decodes it into a server runtime proxy-object, the server handler queries the db, returns a proxy object, encodes it, and sends the function return data over the wire again. That is a ton of work, especially if you have to write it by hand and then maintain robust code in both namespaces -- aka REST. But, I just want to call a function on my server! Save yourself the work and time, and code-generate it instead - Enter gRPC / Twirp .. and now, webrpc :)
- Add RPC streaming support for client/server via websockets
- More code generators.. for Rust, Python, ..
go get -u github.com/webrpc/webrpc/cmd/webrpc-gen
- Write+design a webrpc schema file for your Web service
- Run the code-generator to create your server interface and client, ie.
webrpc-gen -schema=example.ridl -target=go -pkg=service -server -client -out=./service/proto.gen.go
webrpc-gen -schema=example.ridl -target=ts -pkg=client -client -out=./web/client.ts
- Implement the handlers for your server -- of course, it can't guess the server logic :)
another option is to copy the hello-webrpc example, and adapt for your own webapp and server.
The webrpc schema type system is inspired by Go and TypeScript, and is simple and flexible enough to cover the wide variety of language targets, designed to target RPC communication with Web applications and other Web services.
- RIDL, aka RPC IDL, aka "RPC interface design language", format - a documentation-like schema format for describing a server application.
- JSON schema format is also supported if you prefer to write tools to target webrpc's code-gen tools
- Type system inspired by Go + Typescript
- integers, floats, byte, bool, any, null, date/time
- lists (multi-dimensional arrays supported too)
- maps (with nesting / complex structures)
- structs / objects
- optional fields, default values, and pluggable code-generation for a language target
For more information please see the schema readme.
Building from source / making your own code-generator
- Install Go 1.11+
go get -u github.com/webrpc/webrpc/...
go install ./cmd/webrpc-gen
Writing your own code-generator
gen/<yourtargetlang>and start writing templates
- Write an example service and use
make buildto regenerate
- Write tests, TDD is a great approach to confirm things work
- Twirp authors for making twirp. Much of the webrpc-go library comes from the twirp project.
- gRPC authors, for coming up with the overall architecture and patterns for code-generating the bindings between client and server from a common IDL.
If you're passionate about distributed systems, cryptography, privacy, and writing awesome network infrastructure to help power the Arcadeum network, please write to us, hello at arcadeum.net