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 = {
"[email protected]": {
"email": "[email protected]",
"firstName": "Bob",
"lastName": "Smith",
"metadata": {
"foo": "bar",
"active": true
}
},
"[email protected]": {
"email": "[email protected]",
"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: '[email protected]' }, (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: '[email protected]',
firstName: 'Jane',
lastName: 'Smith',
metadata: null }
change the email in client request to '[email protected]'
/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 <[email protected] <javascript:>>
> 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: '[email protected]',
> 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 <[email protected]> wrote:
>>
>> Newbie question... If I have the following sample "User" JSON data:
>>
>> {
>> firstName: 'Bob'
>> lastName: 'Smith',
>> email: '[email protected]',
>> 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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