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95 lines
3.8 KiB
Markdown
95 lines
3.8 KiB
Markdown
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# @improbable-eng/grpc-web
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> Library for making gRPC-Web requests from a browser
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This library is intended for both JavaScript and TypeScript usage from a web browser or NodeJS (see [Usage with NodeJS](#usage-with-nodejs)).
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*Note: This only works if the server supports [gRPC-Web](https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md)*
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A Golang gRPC-Web middleware and a Golang-based gRPC-Web proxy are [available here](https://github.com/improbable-eng/grpc-web).
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Please see the full [gRPC-Web README](https://github.com/improbable-eng/grpc-web) for known limitations.
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## Installation
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`@improbable-eng/grpc-web` has peer dependencies of `google-protobuf` and `@types/google-protobuf`.
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`npm install google-protobuf @types/google-protobuf @improbable-eng/grpc-web --save`
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## Example Project
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There is an [example project available here](https://github.com/improbable-eng/grpc-web/tree/master/client/grpc-web-react-example)
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## Usage Overview
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* Use [`ts-protoc-gen`](https://www.npmjs.com/package/ts-protoc-gen) with [`protoc`](https://github.com/google/protobuf) to generate `.js` and `.d.ts` files for your request and response classes. `ts-protoc-gen` can also generate gRPC service definitions with the `service=true` argument.
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* [Go to code generation docs](docs/code-generation.md)
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* Make a request using [`unary()`](docs/unary.md), [`invoke()`](docs/invoke.md) or [`client()`](docs/client.md)
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```javascript
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import {grpc} from "@improbable-eng/grpc-web";
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// Import code-generated data structures.
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import {BookService} from "./generated/proto/examplecom/library/book_service_pb_service";
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import {GetBookRequest} from "./generated/proto/examplecom/library/book_service_pb";
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const getBookRequest = new GetBookRequest();
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getBookRequest.setIsbn(60929871);
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grpc.unary(BookService.GetBook, {
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request: getBookRequest,
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host: host,
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onEnd: res => {
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const { status, statusMessage, headers, message, trailers } = res;
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if (status === grpc.Code.OK && message) {
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console.log("all ok. got book: ", message.toObject());
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}
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}
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});
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```
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* Requests can be aborted/cancelled before they complete:
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```javascript
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const request = grpc.unary(BookService.GetBook, { ... });
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request.cancel();
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```
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## Available Request Functions
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There are three functions for making gRPC requests:
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### [`grpc.unary`](docs/unary.md)
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This is a convenience function for making requests that consist of a single request message and single response message. It can only be used with unary methods.
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```protobuf
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rpc GetBook(GetBookRequest) returns (Book) {}
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```
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### [`grpc.invoke`](docs/invoke.md)
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This is a convenience function for making requests that consist of a single request message and a stream of response messages (server-streaming). It can also be used with unary methods.
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```protobuf
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rpc GetBook(GetBookRequest) returns (Book) {}
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rpc QueryBooks(QueryBooksRequest) returns (stream Book) {}
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```
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### [`grpc.client`](docs/client.md)
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`grpc.client` returns a client. Dependant upon [transport compatibility](docs/transport.md) this client is capable of sending multiple request messages (client-streaming) and receiving multiple response messages (server-streaming). It can be used with any type of method, but will enforce limiting the sending of messages for unary methods.
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```protobuf
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rpc GetBook(GetBookRequest) returns (Book) {}
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rpc QueryBooks(QueryBooksRequest) returns (stream Book) {}
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rpc LogReadPages(stream PageRead) returns (google.protobuf.Empty) {}
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rpc ListenForBooks(stream QueryBooksRequest) returns (stream Book) {}
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```
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## Usage with NodeJS
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Refer to [grpc-web-node-http-transport](https://www.npmjs.com/package/@improbable-eng/grpc-web-node-http-transport).
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## All Docs
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* [unary()](docs/unary.md)
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* [invoke()](docs/invoke.md)
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* [client()](docs/client.md)
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* [Code Generation](docs/code-generation.md)
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* [Concepts](docs/concepts.md)
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* [Transport](docs/transport.md)
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