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grpc/index.js

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+import grpc from '@grpc/grpc-js';
+import proto from '@grpc/proto-loader';
+
+export function loadPubSub() {
+  const PROTO_PATH = 'grpc/service.proto';
+  const packageDefinition = proto.loadSync(PROTO_PATH, {});
+  const protoDescriptor = grpc.loadPackageDefinition(packageDefinition);
+  return protoDescriptor.pubsub;
+}
+export function setupgRPC(handler) {
+  const server = new grpc.Server();
+  const pubsub = loadPubSub();
+  server.addService(pubsub.PubSub.service, handler)
+  return server
+}
+
+export function createClient(address) {
+  const pubsub = loadPubSub()
+  return new pubsub.PubSub(address, grpc.credentials.createInsecure());
+}
+
+export function startServer(
+  address,
+  handler,
+  logger,
+) {
+  const server = setupgRPC(handler)
+  server.bindAsync(address, grpc.ServerCredentials.createInsecure(), () => {
+    logger.info(`Started server on ${address}`)
+    server.start();
+  });
+  return server
+}

grpc/service.proto

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+syntax = "proto3";
+package pubsub;
+
+service PubSub {
+
+  rpc Publish(PublishMessage) returns (PublishResponse) {}
+
+  rpc Consume(Consumer) returns (Message) {}
+
+}
+
+message PublishResponse {
+}
+
+message Consumer {
+    string topic = 1;
+    uint64 timeout_ms = 2;
+}
+
+message PublishMessage {
+  string topic = 1;
+  string message = 2;
+}
+
+message Message {
+    string message = 1;
+}