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listeners-controller.ts
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listeners-controller.ts
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import { Injectable } from '@nestjs/common/interfaces';
import { Controller } from '@nestjs/common/interfaces/controllers/controller.interface';
import { isUndefined } from '@nestjs/common/utils/shared.utils';
import { ContextIdFactory } from '@nestjs/core/helpers/context-id-factory';
import { ExecutionContextHost } from '@nestjs/core/helpers/execution-context-host';
import { STATIC_CONTEXT } from '@nestjs/core/injector/constants';
import { NestContainer } from '@nestjs/core/injector/container';
import { Injector } from '@nestjs/core/injector/injector';
import {
ContextId,
InstanceWrapper,
} from '@nestjs/core/injector/instance-wrapper';
import { Module } from '@nestjs/core/injector/module';
import { MetadataScanner } from '@nestjs/core/metadata-scanner';
import { REQUEST_CONTEXT_ID } from '@nestjs/core/router/request/request-constants';
import { connectable, Observable, Subject } from 'rxjs';
import { IClientProxyFactory } from './client/client-proxy-factory';
import { ClientsContainer } from './container';
import { ExceptionFiltersContext } from './context/exception-filters-context';
import { RequestContextHost } from './context/request-context-host';
import { RpcContextCreator } from './context/rpc-context-creator';
import {
DEFAULT_CALLBACK_METADATA,
DEFAULT_GRPC_CALLBACK_METADATA,
} from './context/rpc-metadata-constants';
import { BaseRpcContext } from './ctx-host/base-rpc.context';
import {
CustomTransportStrategy,
MessageHandler,
PatternMetadata,
RequestContext,
} from './interfaces';
import { ListenerMetadataExplorer } from './listener-metadata-explorer';
import { ServerGrpc } from './server';
import { Server } from './server/server';
export class ListenersController {
private readonly metadataExplorer = new ListenerMetadataExplorer(
new MetadataScanner(),
);
private readonly exceptionFiltersCache = new WeakMap();
constructor(
private readonly clientsContainer: ClientsContainer,
private readonly contextCreator: RpcContextCreator,
private readonly container: NestContainer,
private readonly injector: Injector,
private readonly clientFactory: IClientProxyFactory,
private readonly exceptionFiltersContext: ExceptionFiltersContext,
) {}
public registerPatternHandlers(
instanceWrapper: InstanceWrapper<Controller | Injectable>,
server: Server & CustomTransportStrategy,
moduleKey: string,
) {
const { instance } = instanceWrapper;
const isStatic = instanceWrapper.isDependencyTreeStatic();
const patternHandlers = this.metadataExplorer.explore(instance as object);
const moduleRef = this.container.getModuleByKey(moduleKey);
const defaultCallMetadata =
server instanceof ServerGrpc
? DEFAULT_GRPC_CALLBACK_METADATA
: DEFAULT_CALLBACK_METADATA;
patternHandlers
.filter(
({ transport }) =>
isUndefined(transport) ||
isUndefined(server.transportId) ||
transport === server.transportId,
)
.reduce((acc, handler) => {
// Optional chaining for backward-compatibility
handler.patterns?.forEach(pattern =>
acc.push({ ...handler, patterns: [pattern] }),
);
return acc;
}, [])
.forEach(
({
patterns: [pattern],
targetCallback,
methodKey,
extras,
isEventHandler,
}) => {
if (isStatic) {
const proxy = this.contextCreator.create(
instance as object,
targetCallback,
moduleKey,
methodKey,
STATIC_CONTEXT,
undefined,
defaultCallMetadata,
);
if (isEventHandler) {
const eventHandler: MessageHandler = (...args: unknown[]) => {
const originalArgs = args;
const [dataOrContextHost] = originalArgs;
if (dataOrContextHost instanceof RequestContextHost) {
args = args.slice(1, args.length);
}
const originalReturnValue = proxy(...args);
const returnedValueWrapper = eventHandler.next?.(
...(originalArgs as Parameters<MessageHandler>),
);
returnedValueWrapper?.then(returnedValue =>
this.connectIfStream(returnedValue as Observable<unknown>),
);
return originalReturnValue;
};
return server.addHandler(
pattern,
eventHandler,
isEventHandler,
extras,
);
} else {
return server.addHandler(pattern, proxy, isEventHandler, extras);
}
}
const asyncHandler = this.createRequestScopedHandler(
instanceWrapper,
pattern,
moduleRef,
moduleKey,
methodKey,
defaultCallMetadata,
);
server.addHandler(pattern, asyncHandler, isEventHandler, extras);
},
);
}
public assignClientsToProperties(instance: Controller | Injectable) {
for (const {
property,
metadata,
} of this.metadataExplorer.scanForClientHooks(instance as object)) {
const client = this.clientFactory.create(metadata);
this.clientsContainer.addClient(client);
this.assignClientToInstance(instance as object, property, client);
}
}
public assignClientToInstance<T = any>(
instance: Controller | Injectable,
property: string,
client: T,
) {
Reflect.set(instance as object, property, client);
}
public createRequestScopedHandler(
wrapper: InstanceWrapper,
pattern: PatternMetadata,
moduleRef: Module,
moduleKey: string,
methodKey: string,
defaultCallMetadata: Record<string, any> = DEFAULT_CALLBACK_METADATA,
) {
const collection = moduleRef.controllers;
const { instance } = wrapper;
const requestScopedHandler: MessageHandler = async (...args: unknown[]) => {
try {
let contextId: ContextId;
let [dataOrContextHost] = args;
if (dataOrContextHost instanceof RequestContextHost) {
contextId = this.getContextId(dataOrContextHost);
args.shift();
} else {
const [data, reqCtx] = args;
const request = RequestContextHost.create(
pattern,
data,
reqCtx as BaseRpcContext,
);
contextId = this.getContextId(request);
this.container.registerRequestProvider(request, contextId);
dataOrContextHost = request;
}
const contextInstance = await this.injector.loadPerContext(
instance,
moduleRef,
collection,
contextId,
);
const proxy = this.contextCreator.create(
contextInstance,
contextInstance[methodKey],
moduleKey,
methodKey,
contextId,
wrapper.id,
defaultCallMetadata,
);
const returnedValueWrapper = requestScopedHandler.next?.(
dataOrContextHost,
...args,
);
returnedValueWrapper?.then(returnedValue =>
this.connectIfStream(returnedValue as Observable<unknown>),
);
return proxy(...args);
} catch (err) {
let exceptionFilter = this.exceptionFiltersCache.get(
instance[methodKey],
);
if (!exceptionFilter) {
exceptionFilter = this.exceptionFiltersContext.create(
instance,
instance[methodKey],
moduleKey,
);
this.exceptionFiltersCache.set(instance[methodKey], exceptionFilter);
}
const host = new ExecutionContextHost(args);
host.setType('rpc');
return exceptionFilter.handle(err, host);
}
};
return requestScopedHandler;
}
private getContextId<T extends RequestContext = any>(request: T): ContextId {
const contextId = ContextIdFactory.getByRequest(request);
if (!request[REQUEST_CONTEXT_ID as any]) {
Object.defineProperty(request, REQUEST_CONTEXT_ID, {
value: contextId,
enumerable: false,
writable: false,
configurable: false,
});
this.container.registerRequestProvider(request, contextId);
}
return contextId;
}
private connectIfStream(source: Observable<unknown>) {
if (!source) {
return;
}
const connectableSource = connectable(source, {
connector: () => new Subject(),
resetOnDisconnect: false,
});
connectableSource.connect();
}
}