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Multi-language protobuf definitions and packaging for VOLTHA

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# voltha-protos

Protobuf files used by [VOLTHA](https://wiki.opencord.org/display/CORD/VOLTHA).

Currently this is used to generate both Golang and Python protobufs and gRPC
stubs.

The testing process is dependent on specific versions of the protobuf tools, so
make sure to use the versions of `protoc` and `protoc-gen-go` specified below.

Protobuf definition files are located in `protos/voltha_protos` directory. This
directory hierarchy and import scheme is required to allow the python code
generated by the gRPC compiler to [have the correct import
paths](https://github.com/grpc/grpc/issues/9575#issuecomment-293934506).

> NOTE: The `protos/google/api` directory has files copied from the [Google
> APIs](https://github.com/googleapis/googleapis), and is only included for
> initial compilation of the VOLTHA protobuf files - these API's should be
> installed independently via either the python
> [googleapis-common-protos](https://pypi.org/project/googleapis-common-protos/)
> package or the golang [go-genproto](https://github.com/google/go-genproto)
> repo.

## Go Environment

Get the voltha-protos repository:

```sh
mkdir -p ~/source
cd ~/source
git clone https://gerrit.opencord.org/voltha-protos
cd voltha-protos
```

### Setting up the Go environment

After installing Go on a Mac or Linux environment, the GOPATH environment
variable needs be set.  These instructions assume it's `~/go`.

Create a symbolic link in the $GOPATH/src tree to the voltha-go repository:

```sh
mkdir -p $GOPATH/src/github.com/opencord
ln -s ~/source/voltha-protos $GOPATH/src/github.com/opencord/voltha-protos
```

## Go Dependencies

### Install Dependencies

Checkout and go install correct version of protoc-gen-go:

```sh
GIT_TAG="v1.3.1"
go get -d -u github.com/golang/protobuf/protoc-gen-go
git -C "$(go env GOPATH)"/src/github.com/golang/protobuf checkout $GIT_TAG
go install github.com/golang/protobuf/protoc-gen-go
```

## Building locally

Install the protobuf compiler (protoc) 3.7.0 either manually or via the
Makefile target (if on Linux amd64).  Then build the python and golang stubs:

```sh
cd $GOPATH/src/github.com/opencord/voltha-protos
make install-protoc
make build
```

use dist/*.tar.gz for local python imports
use go/ for local go imports

## Using voltha-protos in your project

### Python

Installation from Pypi:

`pip install voltha-protos`

or from a local build:

`pip install ~/source/voltha-protos/dist/*.tar.gz`

To use it within your code (for example)

`from voltha_protos import voltha_pb2`

### Go

```sh
go get github.com/opencord/voltha-protos
cd $GOPATH/github.com/opencord/voltha-protos
make build
````

Protos are importable from `github.com/opencord/voltha-protos/v2/go/<packagename>`

To use the libraries, import protos with the root path github.com/opencord/voltha-protos/v2/go/

## Testing

`make test` will run tests for all languages.

## Miscelaneous

[setup.py](https://gerrit.opencord.org/plugins/gitiles/voltha-protos/+/refs/heads/master/setup.py) and [requirements.txt](https://gerrit.opencord.org/plugins/gitiles/voltha-protos/+/refs/heads/master/requirements.txt) versions must be kept in sync.

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