orpc
v0.1.1
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The type-safe Node.js and browser RPC library built on top of socket.io. Empowered with SOA governance and load balancing.
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orpc
The type-safe Node.js and browser RPC library built on top of socket.io. Empowered with SOA governance and load balancing.
Installation
yarn add orpc
Quick Start
shared.ts
export interface HelloServicePrototype extends ServicePrototype {
say(name: string): string;
}
export interface MyRPCSchema extends RPCSchema {
hello: HelloServicePrototype;
}
server.ts
class HelloService implements HelloServicePrototype {
say(name: string): string {
return `Hello, ${name}!`;
}
}
let myRPC: MyRPCSchema = {
hello: new HelloService(),
};
const server = new RPCServer(myRPC);
server.start(8013);
client.ts
let rpc = createClient<MyRPCSchema>('http://localhost:8013/');
let result = await rpc.hello.say('dizy'); // Type-safe
console.log(result); // 'Hello, dizy!'
Core Concepts
ServicePrototype
andRPCSchema
should be shared between client and server.Service
should be implemented only on server.
Service Prototype
A service prototype is an interface that defines the signature of the methods provided in the service. This is shared between both server and client side, so it will help type both our server implementation and client usage.
interface FileServicePrototype extends ServicePrototype {
list(dir: string): Promise<FileInfo[]>;
upload(file: Buffer, saveToDir: string): Promise<void>;
download(path: string): Promise<Buffer>;
delete(path: string): Promise<boolean>;
rename(oldPath: string, newPath: string): Promise<boolean>;
}
RPC Schema
In order to run multiple services on one single server, we build RPC schema to assemble these services into one bigger type. This is also shared between client and server.
interface MyRPCSchema extends RPCSchema {
file: FileServicePrototype;
system: SystemServicePrototype;
blog: BlogServicePrototype;
}
Service
Service is implemented in a form of Class
. And it could be considered as a collection of methods ready to be remotely called. It is expected to implement the corresponding ServerPrototype
on server.
class FileService implements FileServicePrototype{
async list(dir: string): Promise<FileInfo[]>{
let files = await //...implementation
return files;
}
//...
}
Gateway
Gateway
is a reverse proxy that takes clients' calls and sends them to one of the known servers, then gets results and feed them back to clients. To clients, a Gateway
behaves exactly like a RPCServer
, except its performance compete with several servers combined. Gateway
is especially useful for high-cpu-usage services. Also, Gateway
supports SOA governance and load balancing, so it can make sure services are highly-available and calls are well-balanced in terms of distribution to servers.
let config = {
servers: [
{url: 'http://localhost:8021/', weight: 10},
{url: 'http://localhost:8022/', weight: 3},
{url: 'http://localhost:8023/', weight: 4},
], // Servers' info
loadBalancer: smoothWRRLoadBalancer, // built-in Smooth-Weighted-Round-Robin LoadBalancer
log: {debug: true}, // Turn on debug mode
};
let gateway = new Gateway(config);
gateway.start(8014);
APIs
RPCServer
constructor (rpcSchema?: SchemaImplement<Schema>)
methods:
start(port?: number, hostname?: string): void
port
defaults to80
,hostname
defaults to'localhost'
stop(): void
register(name: string, service: object): void
register(name: string, service: ServiceConstructor, initializeForEachClient?: boolean): void
Dynamically register new service.
initializeForEachClient
defaults tofalse
unregister(name: string): boolean
Dynamically cancel registered service.
createClient()
parameters:
url
?: stringDefaults to
'http://localhost/'
returns:
RPCClient<RPCSchema>
usages:
let rpc = createClient<MyRPCSchema>(8080); let result = await rpc.myService.methodA(...args);
RPCClient
RPCClient
should always be created by createClient
. That way, service and schema type information will be attached to it.
constructor (url?: string)
methods:
open(): void
Open connection. Automatically called when created.
close(): void
call(service: string, data: CallData): Promise<any>
call(service: string, method: string, params: any[], options: CallOptions): Promise<any>
Call remote service method.
Gateway
GatewayConfig
let config: GatewayConfig = {
servers: [
{url: 'http://localhost:8015', weight: 10},
{url: 'http://localhost:8016', weight: 4},
{url: 'http://localhost:8017', weight: 6},
], // Servers' info
loadBalancer: smoothWRRLoadBalancer, // Optional: defaults to `evenLoadBalancer`.
downgrade: true, // Optional: defaults to `true`.
downgradeAtAnyError: false, // Whether any error thrown by server will cause its downgrade. Optional: defaults to `false`.
downgradeTolerantTime: 3, // How many tolerant times to fail before the server is downgraded to `0` weight. Optional: defaults to `3`.
downgradeDeadSleepTime: 5, // A many times can a `0` weight server be offered a chance to revive. Optional: defaults to `5`.
log: {
enable: true,
debug: true,
}, // Optional: Defaults to `{enable: true, debug: false}`
};
Gateway
constructor(config: GatewayConfig)
methods:
start(port?: number, hostname?: string): void
Start gateway server.
port
defaults to80
,hostname
defaults to'localhost'
stop(): void
reloadConfig(config: GatewayConfig): void
usage:
see Core Concepts
License
MIT, see the LICENSE file for details.