rules_protobuf

README

rules_protobuf (αlpha)

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Bazel skylark rules for building protocol buffers on (macosx, linux).

Bazel	rules_protobuf	gRPC

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Language	Compile (1)	Build (2)	gRPC (3)
C++	cc_proto_compile	cc_proto_library	yes
C#
Go	go_proto_compile	go_proto_library	yes
Java	java_proto_compile	java_proto_library	yes
JavaNano	android_proto_compile	android_proto_library	yes
Javascript
Objective-C
Python	yes
Ruby

1. Support for generation of protobuf classes via the protoc tool.
2. Support for generation + compilation of outputs with protobuf dependencies.
3. gRPC support via the with_grpc flag.

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Requirements

These are build rules for bazel. If you have not already installed bazel on your workstation, follow the bazel instructions. Here's one way (osx):

Note about protoc and related tools: bazel and rules_protobuf will download or build-from-source all required dependencies, including the protoc tool and required plugins. If you do already have these tools installed, bazel will not use them.

$ curl -O -J -L https://github.com/bazelbuild/bazel/releases/download/0.3.1/bazel-0.3.1-installer-darwin-x86_64.sh
$ shasum -a256 bazel-0.3.1-installer-darwin-x86_64.sh
8d035de9c137bde4f709e3666271af01d1ef6bed6921e1a676d6a6dc0186395c  bazel-0.3.1-installer-darwin-x86_64.sh
$ chmod +x bazel-0.3.1-installer-darwin-x86_64.sh
$ ./bazel-0.3.1-installer-darwin-x86_64.sh
$ bazel version
Build label: 0.3.1
...

Note about golang: this project uses rules-go for go_library, go_binary, and go_test.

Quick Start

Require these rules your WORKSPACE:

git_repository(
  name = "org_pubref_rules_protobuf",
  remote = "https://github.com/pubref/rules_protobuf",
  tag = "0.3.0",
)

Trigger loading of external dependencies. Specify the language(s) you'd like support for.

load("@org_pubref_rules_protobuf//bzl:rules.bzl", "protobuf_dependencies")
protobuf_dependencies(
   with_go = True,
   with_java = True,
   with_cpp = True,
   with_grpc = True,
)

Note: refer to the bzl/repositories.bzl file for the set of external dependencies that will be loaded into your project.

Build a java-based gRPC library:

load("@org_pubref_rules_protobuf//bzl:java/rules.bzl", "java_proto_library")

java_proto_library(
  name = "protolib",
  srcs = ["my.proto"],
  with_grpc = True,
)

Examples

To run the examples & tests in this repository, clone it to your workstation.

# Clone this repo
$ git clone https://github.com/pubref/rules_protobuf

# Go to examples/helloworld directory
$ cd rules_protobuf/examples/helloworld

# Run all tests
$ bazel test ...

# Build a server
$ bazel build cpp/server

# Run a server from the command-line
$ $(bazel info bazel-bin)/examples/helloworld/cpp/server

# Run a client
$ bazel run go/client
$ bazel run cpp/client
$ bazel run java/org/pubref/rules_closure/examples/helloworld/client:netty

Overriding Dependencies

To load alternate versions of dependencies, pass in a dict having the same overall structure of the repositories.bzl file. Entries having a matching key will override those found in the file. For example, to load a different version of https://github.com/golang/protobuf, provide a different commit ID:

load("@org_pubref_rules_protobuf//bzl:rules.bzl", "protobuf_dependencies")
protobuf_dependencies(
   with_go = True,
   overrides = {
     "com_github_golang_protobuf": {
       "commit": "2c1988e8c18d14b142c0b472624f71647cf39adb", # Aug 8, 2016
     }
   },
)

Contributing

Contributions welcome; please create Issues or GitHub pull requests.

Credits

• @yugui: Primary source for the go support from grpc-gateway.

• @mzhaom: Primary source for the skylark rule (from https://github.com/mzhaom/trunk/blob/master/third_party/grpc/grpc_proto.bzl).

• @jart: Overall repository structure and bazel code layout (based on rules_closure).

• Much thanks to all the members of the bazel, protobuf, and gRPC teams.

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