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Question

How to import external (on vendor folder) proto into my own proto?

I'm using this:

syntax = "proto3";
package command;
option go_package = "api";

import "github.com/service/command.proto";

service CommandService {
    rpc Push(Command) returns (PushResponse);
}

message PushResponse {
    string id = 1;
}

But I get an error that the file was not found:

> protoc -I api api/command.proto --go_out=plugins=grpc:api
github.com/service/command.proto: File not found.

Also this gives the same error:

> protoc -I api -I vendor/github.com/service api/command.proto --go_out=plugins=grpc:api
github.com/service/command.proto: File not found.

I tried prefixing with vendor/ on .proto file as well with no success.

Answer 1

You need a -I per folder from which to start looking for imports. import then tries all of them using the relative paths specified in the import statement; so: to use:

protoc -I api [other-options] some.proto

where some.proto has import "github.com/service/command.proto";, then you would need a file-system layout like:

[current folder]
- some.proto
- [api]
  - [github.com]
    - [service]
      - command.proto

(where [...] is a folder)

Note that if you omit -I, then the current directory is assumed as a single import root, so you could have:

[current folder]
- some.proto
- [github.com]
  - [service]
    - command.proto

and just use protoc [other-options] some.proto