Target of URI doesn't exist: 'google/protobuf/timestamp.pb.dart'.

[palkerecsenyi]

Steps to reproduce

article.proto

syntax = "proto3";
package example;

import "google/protobuf/timestamp.proto";

message Article {
  google.protobuf.Timestamp time = 1;
}

protoc --dart_out=. article.proto

The generated Dart code contains an import: import 'google/protobuf/timestamp.pb.dart' as $0; that points to a non-existent file path. I can't find any documentation on how to fix this.

Flutter 1.22.6 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 9b2d32b605 (5 weeks ago) • 2021-01-22 14:36:39 -0800
Engine • revision 2f0af37152
Tools • Dart 2.10.5

libprotoc 3.15.3

protobuf: ^1.1.3

[daniel-v]

Ran into the same.

[kurti77]

you need to compile timestamp.proto (protoc --dart_out=. ./timestamp.proto) and copy the generated dart files into a folder google/protobuf within your project dir.

[cit117]

Ran into the same.

[daniel-v]

@cit117 the trick is to actually have any.proto and other proto files in your project and compile them too. You can grab them from this package, copy and you are done :)

[kroksys]

I fixed it by adding timestamp.proto to protoc command.

If you use import like this import "google/protobuf/timestamp.proto";
Just add google/protobuf/timestamp.proto to protoc command. Look at the last line of example command:

protoc \
    --dart_out=grpc:./some_output_folder \
    -I./third_party_folder \
    -I./folder_with_proto_files ./folder_with_proto_files/any.proto google/protobuf/timestamp.proto

[bddesai]

I faced two kind of errors -> 1) timestamp.proto 2) field_mask.proto

Resolved it with the following command. Thanks to @kroksys

protoc -I 
path/to/directory/containing/protofile 
path/to/filename.proto 
--dart_out=grpc:path/to/destination_folder 
google/protobuf/timestamp.proto 
google/protobuf/field_mask.proto

[maxmccord]

Could this be automated somehow? I'm finding success by adding the full absolute path to the include directory where I installed protoc, but that's a bit of a pain for build reproducibility on different machines.

Sure, I could set up environment variables per-developer, but it really surprises me that the Dart plugin doesn't just know about these well-known types. Am I missing something?

EDIT: This seems to work well without needing the absolute path:

protoc \
  --dart_out=lib/proto \
  --proto_path=path/to/my/protos \
  path/to/my/protos/*.proto \
  $(realpath $(dirname $(which protoc))/..)/include/google/protobuf/*.proto