grpc-node-server-interceptors

gRPC NodeJS Server Interceptors

This package provides an interface for gRPC Servers from @grpc/grpc-js to be created with interceptors. Allows for intercepting incoming requests from gRPC clients as well as intercepting outgoing responses from the server.

Installation

npm:

npm install grpc-node-server-interceptors

yarn:

yarn add grpc-node-server-interceptors

Examples

This example shows how to intercept incoming gRPC client requests on your gRPC server:

import { status as GrpcStatus } from '@grpc/grpc-js`;
import GrpcServerWithInterceptors, { ServerInterceptor, ServerInterceptingCall } from 'grpc-node-server-interceptors';

const interceptors: ServerInterceptor<RequestType, RequestResponse>[] = [
  (call, nextCall) => {
    return new ServerInterceptingCall(nextCall(call), {
      // This is called on every incoming client request before sent to the original handler
      onReceiveMessage: (message, next) => {
        // Continue unto the next interceptor
        next(message);
      },
      // This is called on every outgoing server response before it is sent to the client
      onSendMessage: (response, next) => {
        if (response.status !== GrpcStatus.OK) {
          log.error(response.status);
        }
        next(response);
      },
    });
  }
]

const server = new GrpcServerWithInterceptors({
  ...channelOptions,
  // List of global interceptors. These will be applied to all services added to the server through `addService`.
  interceptors,
});

// Consume the new server the same way you would with `grpc.Server`
server.addService(serviceDefinition, handlers);

server.bindAsync(...);