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| import { Logger } from '@nestjs/common/services/logger.service';
import { loadPackage } from '@nestjs/common/utils/load-package.util';
import { isObject } from '@nestjs/common/utils/shared.utils';
import { Observable } from 'rxjs';
import { GRPC_DEFAULT_URL } from '../constants';
import { InvalidGrpcPackageException } from '../exceptions/errors/invalid-grpc-package.exception';
import { InvalidGrpcServiceException } from '../exceptions/errors/invalid-grpc-service.exception';
import { InvalidProtoDefinitionException } from '../exceptions/errors/invalid-proto-definition.exception';
import { ClientGrpc, GrpcOptions } from '../interfaces';
import { ClientOptions } from '../interfaces/client-metadata.interface';
import { ClientProxy } from './client-proxy';
import { GRPC_CANCELLED } from './constants';
let grpcPackage: any = {};
let grpcProtoLoaderPackage: any = {};
export class ClientGrpcProxy extends ClientProxy implements ClientGrpc {
protected readonly logger = new Logger(ClientProxy.name);
protected readonly url: string;
protected grpcClient: any;
constructor(protected readonly options: ClientOptions['options']) {
super();
this.url =
this.getOptionsProp<GrpcOptions>(options, 'url') || GRPC_DEFAULT_URL;
grpcPackage = loadPackage('grpc', ClientGrpcProxy.name);
grpcProtoLoaderPackage = loadPackage(
'@grpc/proto-loader',
ClientGrpcProxy.name,
);
this.grpcClient = this.createClient();
}
public getService<T extends {}>(name: string): T {
const options: any = isObject(this.options)
? { ...this.options, loader: '' }
: {};
if (!this.grpcClient[name]) {
throw new InvalidGrpcServiceException();
}
const grpcClient = new this.grpcClient[name](
this.url,
options.credentials || grpcPackage.credentials.createInsecure(),
options,
);
const protoMethods = Object.keys(this.grpcClient[name].prototype);
const grpcService = {} as T;
protoMethods.forEach(m => {
const key = m[0].toLowerCase() + m.slice(1, m.length);
grpcService[key] = this.createServiceMethod(grpcClient, m);
});
return grpcService;
}
public createServiceMethod(
client: any,
methodName: string,
): (...args) => Observable<any> {
return client[methodName].responseStream
? this.createStreamServiceMethod(client, methodName)
: this.createUnaryServiceMethod(client, methodName);
}
public createStreamServiceMethod(
client: any,
methodName: string,
): (...args) => Observable<any> {
return (...args) => {
return new Observable(observer => {
let isClientCanceled = false;
const call = client[methodName](...args);
call.on('data', (data: any) => observer.next(data));
call.on('error', (error: any) => {
if (error.details === GRPC_CANCELLED) {
call.destroy();
Eif (isClientCanceled) {
return;
}
}
observer.error(error);
});
call.on('end', () => {
call.removeAllListeners();
observer.complete();
});
return () => {
if (call.finished) {
return undefined;
}
isClientCanceled = true;
call.cancel();
};
});
};
}
public createUnaryServiceMethod(
client: any,
methodName: string,
): (...args) => Observable<any> {
return (...args) => {
return new Observable(observer => {
client[methodName](...args, (error: any, data: any) => {
Iif (error) {
return observer.error(error);
}
observer.next(data);
observer.complete();
});
});
};
}
public createClient(): any {
const grpcContext = this.loadProto();
const packageName = this.getOptionsProp<GrpcOptions>(
this.options,
'package',
);
const grpcPkg = this.lookupPackage(grpcContext, packageName);
if (!grpcPkg) {
const invalidPackageError = new InvalidGrpcPackageException();
this.logger.error(invalidPackageError.message, invalidPackageError.stack);
throw invalidPackageError;
}
return grpcPkg;
}
public loadProto(): any {
try {
const file = this.getOptionsProp<GrpcOptions>(this.options, 'protoPath');
const loader = this.getOptionsProp<GrpcOptions>(this.options, 'loader');
const packageDefinition = grpcProtoLoaderPackage.loadSync(file, loader);
const packageObject = grpcPackage.loadPackageDefinition(
packageDefinition,
);
return packageObject;
} catch (err) {
const invalidProtoError = new InvalidProtoDefinitionException();
const message =
err && err.message ? err.message : invalidProtoError.message;
this.logger.error(message, invalidProtoError.stack);
throw invalidProtoError;
}
}
public lookupPackage(root: any, packageName: string) {
/** Reference: https://github.com/kondi/rxjs-grpc */
let pkg = root;
for (const name of packageName.split(/\./)) {
pkg = pkg[name];
}
return pkg;
}
public close() {
this.grpcClient && this.grpcClient.close();
this.grpcClient = null;
}
public async connect(): Promise<any> {
throw new Error('The "connect()" method is not supported in gRPC mode.');
}
public send<TResult = any, TInput = any>(
pattern: any,
data: TInput,
): Observable<TResult> {
throw new Error(
'Method is not supported in gRPC mode. Use ClientGrpc instead (learn more in the documentation).',
);
}
protected publish(partialPacket, callback: (packet) => any) {
throw new Error(
'Method is not supported in gRPC mode. Use ClientGrpc instead (learn more in the documentation).',
);
}
}
|