I am working with Node js and GRPC . i have created a simple GRPC server
and client .
What i want to do is create a custom error in the server and pass it to the
client . my code looks like this .
*Server.js*
var error = require('error');
var PROTO_PATH = grpc.load(__dirname + '/proto/hello.proto');var hello_proto =
PROTO_PATH.hello;
function sayHello(call, callback) {
try {
var jsErr = new Error('MY_ERROR');
jsErr.newStatus = 401;
jsErr.newMessage = 'custom unAuthorized error';
console.log(Object.getOwnPropertyNames(jsErr));
console.log(jsErr);
callback(jsErr);
} catch(e) {
callback(e);
}}
function sayHelloAgain(call, callback) {
callback(null, {message: 'Hello Again ' + call.request.name});}
function main() {
var server = new grpc.Server();
server.addProtoService(hello_proto.Hello.service, {sayHello:
sayHello,sayHelloAgain: sayHelloAgain });
server.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure());
server.start();}
main();
*Client.js*
var grpc = require('grpc');
var PROTO_PATH = grpc.load(__dirname + '/proto/hello.proto');var hello_proto =
PROTO_PATH.hello;
function main() {
var client = new
hello_proto.Hello('localhost:50051',grpc.credentials.createInsecure());
var user;
if (process.argv.length >= 3) {
user = process.argv[2];
} else {
user = 'world';
}
client.sayHello({name: user}, function(err, response) {
console.log(Object.getOwnPropertyNames(err));
console.log(err);
});}
main();
and my proto file
syntax = "proto3";
package hello;
service Hello {
rpc sayHello(sayHelloRequest) returns (sayHelloResponse) {}
rpc sayHelloAgain(sayHelloRequest) returns (sayHelloResponse) {}}
message sayHelloRequest {
string name = 1;}
message sayHelloResponse {
string message = 1;}
when i run the cient the result from each looks like this
Server .
[ 'stack', 'message', 'newStatus', 'newMessage' ]{ [Error: MY_ERROR] newStatus:
401, newMessage: 'custom unAutorized error' }
Client .
[ 'stack', 'message', 'code', 'metadata' ]{ [Error: MY_ERROR] code: 2,
metadata: Metadata { _internal_repr: {} } }
So my created custom javascript error's newStatus, newMessage properties
have removed and it has converted to GRPC standard error message .
My Questions are
1. Is it possible to send a custom message to client ?
2. Can i create a GRPC error , not a javascript error ?
3. one way to send custom attributes to client is i think is add the
custom data to Metadata . but i am also not sure how to do it .
Please help . Thanks in advance .
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