Here's a simpler server.js that doesn't require a client.js or deals with 
any of the grpc stuff really.

const path = require('path')
const grpc = require('grpc')

const PROTO_PATH = path.resolve(__dirname, './user.proto')
const HOSTPORT = '0.0.0.0:50051'

const UserProto = grpc.load(PROTO_PATH);
const User = UserProto.User

const data = {
  "b...@gmail.com": {
    "email": "b...@gmail.com",
    "firstName": "Bob",
    "lastName": "Smith",
    "metadata": {
      "foo": "bar",
      "active": true
    }
  },
  "j...@gmail.com": {
    "email": "j...@gmail.com",
    "firstName": "Jane",
    "lastName": "Smith"
  }
}

function main() {
  const u = new User(data['j...@gmail.com'])
  console.log(u)
}

main()

change the email to 'b...@gmail.com' and it would crash.

On Wednesday, 16 November 2016 14:38:55 UTC-4, Bojan D wrote:
>
> Sure sorry...
>
> I am working with node.js and trying to use grpc. Reproducible steps:
>
> Install node 6.9.1
>
> mkdir grpctest
> cd grpctest
> npm install grpc
>
> user.proto:
>
> import "google/protobuf/struct.proto";
>
> syntax = "proto3";
>
> package user;
>
> message User {
>   string email = 1;
>   string firstName = 2;
>   string lastName = 3;
>   google.protobuf.Value metadata = 4;
> }
>
> message GetUserRequest {
>   string email = 1;
> }
>
> service UserService {
>   rpc GetUser(GetUserRequest) returns (User);
> }
>
> server.js:
>
> const path = require('path')
> const grpc = require('grpc')
>
> const PROTO_PATH = path.resolve(__dirname, './user.proto')
> const HOSTPORT = '0.0.0.0:50051'
>
> const UserService = grpc.load(PROTO_PATH).user.UserService
>
> const data = {
>   "b...@gmail.com": {
>     "email": "b...@gmail.com",
>     "firstName": "Bob",
>     "lastName": "Smith",
>     "metadata": {
>       "foo": "bar",
>       "active": true
>     }
>   },
>   "j...@gmail.com": {
>     "email": "j...@gmail.com",
>     "firstName": "Jane",
>     "lastName": "Smith"
>   }
> }
>
> function getUser(call, callback) {
>   const user = data[call.request.email]
>   if (!user) {
>     return callback(new Error('User Not Found'))
>   }
>   return callback(null, user)
> }
>
> function main() {
>   const server = new grpc.Server()
>   server.addProtoService(UserService.service, { getUser })
>   server.bind(HOSTPORT, grpc.ServerCredentials.createInsecure())
>   server.start()
>   console.log(`User service running @ ${HOSTPORT}`)
> }
>
> main()
>
> client.js
>
> const path = require('path')
> const grpc = require('grpc')
>
> const PROTO_PATH = path.resolve(__dirname, './user.proto')
> const HOSTPORT = '0.0.0.0:50051'
>
> const UserService = grpc.load(PROTO_PATH).user.UserService
> const client = new UserService(HOSTPORT, grpc.credentials.createInsecure())
>
> client.getUser({ email: 'j...@gmail.com' }, (err, user) => {
>   console.log(user)
>   process.exit()
> })
>
>
> Run the server using command:
>
> node server.js
> User service running @ 0.0.0.0:50051
>
> Run the client:
>
> node client.js
> { email: 'j...@gmail.com',
>   firstName: 'Jane',
>   lastName: 'Smith',
>   metadata: null }
>
> change the email in client request to 'b...@gmail.com'
>
>
> /Users/bojand/dev/nodejs/grpctest/node_modules/protobufjs/dist/protobuf.js:2472
>                             throw Error(this+"#"+keyOrObj+" is not a 
> field: undefined");
>                             ^
>
> Error: .google.protobuf.Value#foo is not a field: undefined
>     at Error (native)
> ...
>
> Within the server part once we load proto we do have a constructor for the 
> User class, and I've tried playing around with trying to create an instance 
> of that in different ways and it crashes when trying to create that 
> instance. I've also tried to encode from stringified JSON and still fails. 
> When there is "metadata" it crashes. I think I am doing something dumb but 
> I am not sure what.
>
> Thanks.
>
> On Wednesday, 16 November 2016 13:58:44 UTC-4, Tim Kientzle wrote:
>>
>> I think we need more details:
>>
>>    Are you using C++ or Java or Python or Ruby or C# or some other 
>> language?
>>
>>    What version of protoc?
>>
>>    Can you show the code you’re using to create the message?
>>
>> Tim
>>
>>
>> On Nov 16, 2016, at 5:02 AM, Bojan D <dbo...@gmail.com> wrote:
>>
>> Thanks for the answer. Somehow I missed the Protocol Buffers Well-Known 
>> Types page in the docs / protobuf website.
>>
>> I still have issue creating an instance of the message. For example if I 
>> have a plain object:
>>
>> {
>>   firstName: 'Bob'
>>   lastName: 'Smith',
>>   email: 'b...@gmail.com',
>>   metadata: {
>>     foo: 'bar',
>>     active: true
>>   }
>> }
>>
>> And I try to create an instance of the message (to be sent via grpc) I 
>> get error
>>
>> .google.protobuf.Struct#foo is not a field: undefined
>>
>> Same thing if I use google.protobuf.Value. I've tried numerous ways of 
>> doing this but can't seem to accomplish it. I must be missing something. 
>> Anyone have any ideas.
>>
>> Thanks for the help again.
>>
>> Bojan
>>
>> On Tuesday, 15 November 2016 15:57:20 UTC-4, Tim Kientzle wrote:
>>>
>>>
>>> On Nov 15, 2016, at 9:15 AM, Bojan D <dbo...@gmail.com> wrote:
>>>
>>> Newbie question... If I have the following sample "User" JSON data:
>>>
>>> {
>>>   firstName: 'Bob'
>>>   lastName: 'Smith',
>>>   email: 'b...@gmail.com',
>>>   metadata: {
>>>     // a plain JS object that 
>>>     // - will always exist and be at least an empty {} object
>>>     // - could potentially contain any number of properties and values, 
>>> depending on specific "user"
>>>   }
>>> }
>>>
>>> How do I represent the metadata property within proto definition?
>>>
>>>
>>>
>>> You want to use the well-known types “Struct” or “Value”, which are 
>>> specifically designed to support ad hoc JSON parsing.  “Struct” supports 
>>> parsing any valid JSON object structure, “Value” can parse any valid JSON:
>>>
>>> message User {
>>>   string email = 1;
>>>   string firstName = 2;
>>>   string lastName = 3;
>>>   google.protobuf.Struct metadata = 4;
>>> }
>>>
>>>
>>> Tim
>>>
>>>
>> -- 
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>>
>>
>>

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