Node gRPC returns "No status received" when deployed on Cloud Run with Docker

Question

After deploying my server on Cloud Run, calling the endpoint with BloomRPC or other clients, the service returns "error": "2 UNKNOWN: No status received". Calling the server locally with PORT=7000 node index.js on localhost:7000 works fine. I guess Cloud Run is adding some TLS magic somewhere and maybe resets the headers but I have no idea how to fix that.

Here's my code:

const grpc = require("@grpc/grpc-js");
const protoLoader = require('@grpc/proto-loader');

const reportGenProto = protoLoader.loadSync("reportGen.proto");
const packageObject = grpc.loadPackageDefinition(reportGenProto);

const server = new grpc.Server();
server.addService(packageObject.ReportGeneratorService.service, {
    Ping: async function (call, callback) {
        console.log("PONG");
        callback(null, {
            pong: "pong"
        });
    },
});

server.bindAsync(`0.0.0.0:${process.env.PORT}`, grpc.ServerCredentials.createInsecure(), (err) => {
    if (err) throw err;
    console.log('Server running on port', process.env.PORT);
    server.start();
});

And this is the .proto:

syntax = "proto3";

service ReportGeneratorService {
  rpc Ping (Empty) returns (Pong) {}
}

message Pong {
  string pong = 1;
}

message Empty {}

Cloud Run logs don't say anything other than that console.log("PONG"). I've tried enabling HTTP/2 even though I'm not using streams but the same thing is returned.

I'm building and deploying inside a Docker container, as I need some dependencies for what I'll do later with the server. This is the Dockerfile:

# we just need the LibreOffice environment to convert the file, this we'll do
FROM ideolys/carbone-env-docker

ENV DIR /app
WORKDIR ${DIR}
COPY . ${DIR}
RUN npm install
ENV TZ Europe/Rome

CMD [ "node", "index.js" ]

I'm also adding that using the deprecated gRPC node package works fine without changing anything in the configuration. The problem happens only when using the new grpc-js package.

Answer 1

I repro'd your solution (code unchanged) and it works for me.

{
    "name": "72141720",
    "version": "0.0.1",
    "scripts": {
      "start": "node index.js"
    },
    "dependencies": {
        "@grpc/grpc-js": "^1.6.7",
        "@grpc/proto-loader":"^0.6.12"
    }
}

And:

BILLING=
PROJECT=
REGION=
SERVICE=

gcloud projects create ${PROJECT}

gcloud beta billing projects link ${PROJECT} \
--billing-account=${BILLING}

for SERVICE in "artifactregistry" "cloudbuild" "run"
do
  gcloud services enable ${SERVICE}.googleapis.com \
  --project=${PROJECT}
done

# Deploy from source
gcloud run deploy ${SERVICE} \
--source=${PWD} \
--project=${PROJECT} \
--region=${REGION}

# Determine service endpoint
# Remove "https://"
# Add ":443"
ENDPOINT=$(\
  gcloud run services describe ${SERVICE} \
  --project=${PROJECT} \
  --region=${REGION} \
  --format="value(status.Url)") && \
ENDPOINT="${ENDPOINT#https://}:443"

# gRPCurl it
# https://github.com/fullstorydev/grpcurl
grpcurl \
-proto ./reportGen.proto \
${ENDPOINT} \
ReportGeneratorService/Ping

Yields:

{
  "pong": "pong"
}