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import {RpcErrorCodes, RpcError} from '@jsonjoy.com/rpc-error';
import {subscribeCompleteObserver} from '../caller/util/subscribeCompleteObserver';
import {TypedRpcError} from '../callee/error/typed';
import {unknown, Value} from '@jsonjoy.com/json-type';
import type {Call} from '../callee/Call';
import type {Callee} from '../callee/types';
import type {Observable} from 'rxjs';
import type {LogicalChannelBase} from '../channel';
/**
* Processes incoming Reactive-RPC messages and manages in-flight calls. Used
* for WebSocket servers to handle messages. Implements server-side part of
* Reactive-RPC protocol.
*/
export class RxLogicalChannelBaseDispatcher<Ctx> {
private readonly activeStreamCalls: Map<number, Call<unknown, unknown>> = new Map();
public onSendError: (error: unknown, message: msg.RxMessage) => void = () => {};
public onMessageError: (error: unknown, message: msg.RxMessage) => void = () => {};
public onUnknownMessage: (message: unknown) => void = () => {};
constructor(
private readonly channel: LogicalChannelBase<msg.RxClientMessage[], msg.RxServerMessage[]>,
private readonly callee: Callee<Ctx, any>,
private readonly ctx: Ctx,
) {
channel.onmsg = (messages: msg.RxMessage[]) => this.onMessages(messages, this.ctx);
}
private send(message: msg.RxServerMessage | msg.NotificationMessage): void {
try {
this.channel.send([message]);
} catch (error) {
this.onSendError(error, message);
this.channel.close();
}
}
/**
* Receives a list of all incoming messages from the client to process.
*
* @param messages A list of received messages.
* @param ctx Server context.
*/
public onMessages(messages: msg.RxMessage[], ctx: Ctx): void {
const length = messages.length;
for (let i = 0; i < length; i++) this.onMessage(messages[i], ctx);
}
/**
* Processes a single incoming Reactive-RPC message.
*
* @param message A single Reactive-RPC message.
* @param ctx Server context.
*/
public onMessage(message: msg.RxMessage, ctx: Ctx): void {
try {
if (message instanceof msg.RequestDataMessage) this.onRequestDataMessage(message, ctx);
else if (message instanceof msg.RequestCompleteMessage) this.onRequestCompleteMessage(message, ctx);
else Iif (message instanceof msg.RequestErrorMessage) this.onRequestErrorMessage(message, ctx);
else if (message instanceof msg.NotificationMessage) this.onNotificationMessage(message, ctx);
else Eif (message instanceof msg.ResponseUnsubscribeMessage) this.onUnsubscribeMessage(message);
else this.onUnknownMessage(message);
} catch (error) {
this.onMessageError(error, message);
this.channel.close();
}
}
public sendNotification(method: string, value: Value): void {
const message = new msg.NotificationMessage(method, value instanceof Value ? value : unknown(value));
this.send(message);
}
protected sendCompleteMessage(id: number, value: Value | unknown | undefined): void {
const message = new msg.ResponseCompleteMessage(
id,
value !== undefined ? (value instanceof Value ? value : unknown(value)) : undefined,
);
this.send(message);
}
protected sendDataMessage(id: number, value: Value): void {
const message = new msg.ResponseDataMessage(id, value instanceof Value ? value : unknown(value));
this.send(message);
}
protected sendErrorMessage(id: number, value: unknown): void {
const errorValue = TypedRpcError.valueFrom(value, value instanceof Value ? value : unknown(value));
const message = new msg.ResponseErrorMessage(id, errorValue);
this.send(message);
}
protected sendUnsubscribeMessage(id: number): void {
const message = new msg.RequestUnsubscribeMessage(id);
this.send(message);
}
protected execStaticCall(id: number, name: string, request: unknown, ctx: Ctx): void {
this.callee
.call(name, request as any, ctx)
.then((value: any) => this.sendCompleteMessage(id, value))
.catch((value: any) => this.sendErrorMessage(id, value));
}
protected onStreamError = (id: number, error: Value): void => {
this.sendErrorMessage(id, error);
this.activeStreamCalls.delete(id);
};
public stop(reason: RpcErrorCodes = RpcErrorCodes.STOP) {
this.send = <any>(() => {});
for (const call of this.activeStreamCalls.values()) {
try {
call.req$.error(TypedRpcError.valueFromCode(reason));
call.stop$.next(null);
} catch (error) {
// tslint:disable-next-line no-console
console.error('STOPPING_ERROR', error);
}
}
this.activeStreamCalls.clear();
}
public disconnect() {
this.stop(RpcErrorCodes.DISCONNECT);
}
private sendError(id: number, code: RpcErrorCodes): void {
const data = TypedRpcError.valueFromCode(code);
this.sendErrorMessage(id, data);
}
private createStreamCall(id: number, name: string, ctx: Ctx): Call<unknown, unknown> {
const call = this.callee.createCall(name, ctx);
this.activeStreamCalls.set(id, call);
// call.res$.subscribe({
// next: (value: RpcValue) => this.sendDataMessage(id, value),
// error: (error: unknown) => this.onStreamError(id, error as RpcValue),
// complete: () => {
// this.activeStreamCalls.delete(id);
// this.sendCompleteMessage(id, undefined);
// },
// });
subscribeCompleteObserver<Value>(call.res$ as Observable<Value>, {
next: (value: Value) => {
this.sendDataMessage(id, value);
},
error: (error: unknown) => {
this.onStreamError(id, error as Value);
},
complete: (value: Value | undefined) => {
this.activeStreamCalls.delete(id);
this.sendCompleteMessage(id, value);
},
});
call.reqUnsubscribe$.subscribe(() => {
if (this.activeStreamCalls.has(id)) this.sendUnsubscribeMessage(id);
});
return call;
}
public onRequestDataMessage(message: msg.RequestDataMessage, ctx: Ctx): void {
const {id, method, value} = message;
let call = this.activeStreamCalls.get(id);
Eif (!call) {
Iif (!method) {
this.sendError(id, RpcErrorCodes.METHOD_INV);
return;
}
const info = this.callee.info(method);
Iif (!info) {
this.sendError(id, RpcErrorCodes.METHOD_UNK);
return;
}
if (info.rx) {
call = this.createStreamCall(id, method, ctx);
} else {
this.execStaticCall(id, method, value ? value.data : undefined, ctx);
return;
}
}
Eif (call) {
const data = value ? value.data : undefined;
Eif (data !== undefined) {
call.req$.next(data);
}
}
}
public onRequestCompleteMessage(message: msg.RequestCompleteMessage, ctx: Ctx): void {
const {id, method, value} = message;
const call = this.activeStreamCalls.get(id);
if (call) {
const {req$} = call;
const data = value ? value.data : undefined;
Iif (data !== undefined) req$.next(data);
req$.complete();
return;
}
Iif (!method) {
// If existing call not found, and method is not specified, it was
// a *RequestComplete* message sent to a previous call, which already
// completed, so we just ignore it.
return;
}
const caller = this.callee;
const info = caller.info(method);
Iif (!info) {
this.sendError(id, RpcErrorCodes.METHOD_UNK);
return;
}
if (info.rx) {
const streamCall = this.createStreamCall(id, method, ctx);
streamCall.req$.next(value ? value.data : undefined);
streamCall.req$.complete();
} else {
const data = value ? value.data : undefined;
this.execStaticCall(id, method, data, ctx);
}
}
public onRequestErrorMessage(message: msg.RequestErrorMessage, ctx: Ctx): void {
const {id, method, value} = message;
const call = this.activeStreamCalls.get(id);
if (call) {
call.req$.error(value.data);
return;
}
if (!method) {
this.sendError(id, RpcErrorCodes.METHOD_INV);
return;
}
const info = this.callee.info(method);
if (!info) {
this.sendError(id, RpcErrorCodes.METHOD_UNK);
return;
}
if (!info.rx) {
void this.sendError(id, RpcErrorCodes.METHOD_UNK);
return;
}
const streamCall = this.createStreamCall(id, method, ctx);
if (!streamCall) return;
streamCall.req$.error(value.data);
}
public onUnsubscribeMessage(message: msg.ResponseUnsubscribeMessage): void {
const {id} = message;
const call = this.activeStreamCalls.get(id);
if (!call) return;
this.activeStreamCalls.delete(id);
call.req$.complete();
}
public onNotificationMessage(message: msg.NotificationMessage, ctx: Ctx): void {
const {method, value} = message;
Iif (!method || method.length > 128) throw RpcError.fromErrno(RpcErrorCodes.METHOD_INV);
const request = value && typeof value === 'object' ? value?.data : undefined;
this.callee.notify(method, request, ctx).catch(() => {});
}
}
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