fix

src/backend/RPCSocketServer.ts

@@ -0,0 +1,256 @@
+import http = require('http');
+import bsock = require('bsock');
+
+import * as uuid from "uuid/v4"
+import { Socket } from "./RPCSocketServer"
+
+type rpcType = 'hook' | 'unhook' | 'call'
+export type Outcome = "Success" | "Error"
+export type Visibility = "127.0.0.1" | "0.0.0.0"
+
+/* Responses */
+export class Response{
+    constructor(
+        public message?:string
+    ){}
+}
+
+export class SuccessResponse extends Response{
+    result:Outcome = "Success"
+
+    constructor(
+        message?:string
+    ){
+        super(message)
+    }
+}
+
+export class ErrorResponse extends Response{
+    result:Outcome = "Error"
+
+    constructor(
+        message: string = "Unknown error"
+    ){
+        super(message)
+    } 
+}
+
+export class SubscriptionResponse extends SuccessResponse{
+    constructor(
+        public uid: string,
+        message?:string
+    ){
+        super(message)
+    }
+}
+export type UnhookFunction = (uid:string) => Promise<SuccessResponse | ErrorResponse>
+export type callbackFunction = (...args) => Promise<SubscriptionResponse | ErrorResponse>
+export type AsyncFunction = (...args) => Promise<any>
+
+export interface RPCExporter{
+    name: string
+    exportRPCs() : socketioRPC[]
+    exportPublicRPCs() : socketioRPC[]
+}
+
+type baseRPC = { 
+    type: rpcType
+    name: string
+}
+
+type hookRPC = baseRPC & {
+    type: 'hook'
+    func: callbackFunction
+    unhook: UnhookFunction
+}
+
+type unhookRPC = baseRPC & {
+    type: 'unhook'
+    func: UnhookFunction
+}
+
+type callRPC = baseRPC & {
+    type: 'call'
+    func: (...args) => Promise<any>
+}
+
+export type socketioRPC = callRPC | unhookRPC | hookRPC
+
+export type baseInfo = {
+    owner: string,
+    argNames: string[],
+}
+
+type HookInfo = baseRPC & baseInfo & { 
+    type: 'hook', 
+    generator: (socket) => callbackFunction
+    unhook: UnhookFunction
+}
+
+type UnhookInfo = baseRPC & baseInfo & {
+    type: 'unhook',
+    func: UnhookFunction
+}
+
+type CallInfo = baseRPC & baseInfo & {
+    type: 'call',
+    func: AsyncFunction
+}
+
+type RpcInfo = HookInfo | UnhookInfo | CallInfo
+
+export type ExtendedRpcInfo = RpcInfo & { uniqueName: string } 
+
+export const rpcToRpcinfo = (rpc : socketioRPC, owner: string):RpcInfo => {
+    switch(rpc.type){
+        case "call" :
+            return {
+                owner: owner,
+                argNames: extractArgs(rpc.func),
+                type: rpc.type,
+                name: rpc.name,
+                func: rpc.func,
+            }
+        case "unhook" :
+            return {
+                owner: owner,
+                argNames: extractArgs(rpc.func),
+                type: rpc.type,
+                name: rpc.name,
+                func: rpc.func,
+            }
+        case "hook" :
+            const generator = hookGenerator(rpc)
+            return {
+                owner: owner,
+                argNames: extractArgs(generator(undefined)),
+                type: rpc.type,
+                name: rpc.name,
+                unhook: rpc.unhook,
+                generator: generator,
+            }
+    }
+}
+
+
+function rpcHooker(socket: Socket, exporter:RPCExporter, makeUnique = true):ExtendedRpcInfo[]{
+    const owner = exporter.name
+    const RPCs = [...exporter.exportPublicRPCs(), ...exporter.exportRPCs()]
+    const suffix = makeUnique?"-"+uuid().substr(0,4):""
+    return RPCs.map(rpc => rpcToRpcinfo(rpc, owner))
+    .map(info => {
+        const ret:any = info
+        ret.uniqueName = info.name+suffix
+
+        switch(info.type){
+            case "hook":
+                socket.hook(ret.uniqueName, info.generator(socket))
+                break;
+            default:
+                socket.hook(ret.uniqueName, info.func)
+        }
+        socket.on('close', () => socket.unhook(info.name))
+        return ret
+    })
+}
+
+const hookGenerator = (rpc:hookRPC): HookInfo['generator'] => { 
+    const argsArr = extractArgs(rpc.func)
+    argsArr.pop()
+    const args = argsArr.join(',')
+
+    return eval(`(socket) => async (`+args+`) => { 
+        const res = await rpc.func(`+args+(args.length!==0?',':'')+` (x) => {
+            socket.call(res.uid, x)
+        })
+        if(res.result == 'Success'){
+            socket.on('close', async () => {
+                const unhookRes = await rpc.unhook(res.uid)
+                console.log("Specific close handler for", rpc.name, res.uid, unhookRes)
+            })
+
+        }
+        return res
+    }`)
+}
+
+const extractArgs = (f:Function):string[] => {
+    let fn = String(f)
+    let args = fn.substr(0, fn.indexOf(")"))
+    args = args.substr(fn.indexOf("(")+1)
+    let ret = args.split(",")
+    return ret
+}
+
+
+type OnFunction = (type: 'error' | 'close', f: (e?:any)=>void) => Socket
+
+export interface Socket {
+    port: number
+    hook: (rpcname: string, ...args: any[]) => Socket
+    unhook: (rpcname:string) => Socket
+    call: (rpcname:string, ...args: any[]) => Promise<any>
+    fire: (rpcname:string, ...args: any[]) => Promise<any>
+    on: OnFunction
+    destroy: ()=>void
+    close: ()=>void
+}
+
+export type RPCSocketConf = {
+    connectionHandler: (socket:Socket) => void
+    errorHandler: (socket:Socket) => (error:any) => void
+    closeHandler: (socket:Socket) => () =>  void
+}
+
+export class RPCSocketServer{
+    
+    private io = bsock.createServer()
+    private wsServer = http.createServer()
+
+    constructor(
+        private port:number,
+        private rpcExporters: RPCExporter[] = [],
+        private visibility: Visibility = "127.0.0.1",
+        private conf: RPCSocketConf = {
+            errorHandler: (socket:Socket) => (error:any) => { socket.destroy(); console.error(error) },
+            closeHandler: (socket:Socket) => () => { console.log("Socket closing") },
+            connectionHandler: (socket:Socket) => { console.log("New websocket connection in port "+socket.port) }
+        }
+    ){
+        this.startWebsocket()
+    }
+
+    private startWebsocket(){
+        try{
+            this.io.attach(this.wsServer)
+            this.io.on('socket', (socket:Socket) => {
+                socket.on('error', this.conf.errorHandler(socket))
+                socket.on('close', this.conf.closeHandler(socket))
+                if(this.visibility === "127.0.0.1")
+                    this.initRPCs(socket)
+                else
+                    this.initPublicRPCs(socket)
+            })
+            this.wsServer.listen(this.port, this.visibility)
+        }catch(e){
+            //@ts-ignore
+            this.errorHandler(undefined)("Unable to connect to socket")
+        }
+    }
+
+    protected initRPCs(socket:Socket){
+        socket.hook('info', () => rpcInfos)
+
+        const rpcInfos:ExtendedRpcInfo[] = [
+            ...this.rpcExporters.flatMap(exporter => rpcHooker(socket, exporter))
+        ]
+    }
+
+    protected initPublicRPCs(socket:Socket){
+        socket.hook('info', () => rpcInfos)
+
+        const rpcInfos:ExtendedRpcInfo[] = [
+            ...this.rpcExporters.flatMap(exporter => rpcHooker(socket, exporter))
+        ]
+    }
+}