How to use predifined protobuf type (i.e. "google/protobuf/timestamp.proto") with gRPC

Add /usr/local/include to include paths to use /usr/local/include/google/api/timestamp.proto:

protoc -I/usr/local/include -I. --go_out=plugins=grpc:. *.proto

As you can see in timestamp.proto, Timestamp exists in package google.protobuf, so you have to modify to use Timestamp like this:

message Foo {
    google.protobuf.Timestamp modifiedTime = 1;
    ...
}

It is not fully supported yet, but you can make it work by changing

message Foo {
    google.protobuf.Timestamp modifiedTime = 1;
    ...
}

and by fixing generated file import

import google_protobuf "google/protobuf/timestamp.pb"

to

import google_protobuf "github.com/golang/protobuf/ptypes/timestamp"

In my case problem was in my Fedora 29 setup.

# Install Protoc compiler. By default it is 3.5.0 version
sudo dnf -y install protoc

This was my bad setup. So i fixed it with following steps. Pay attention to grayed out command lines too.

# Uninstall old 3.5.0 version
sudo dnf remove protobuf

# Make sure you grab the latest version
curl -OL  
https://github.com/protocolbuffers/protobuf/releases/download/v3.6.1/protoc-3.6.1-linux-x86_64.zip
# Unzip
unzip protoc-3.6.1-linux-x86_64.zip -d protoc3
# Move protoc to /usr/local/bin/
sudo mv protoc3/bin/* /usr/local/bin/
# Move protoc3/include to /usr/local/include/
sudo mv protoc3/include/* /usr/local/include/
# Optional: change owner
sudo chown $USER /usr/local/bin/protoc
sudo chown -R $USER /usr/local/include/google

After this I am able to use:

import "google/protobuf/timestamp.proto";

message Session {
    google.protobuf.Timestamp create_time = 1;
}