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protox
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0.7.0
A fast, easy to use and 100% conformant Elixir library for Google Protocol Buffers (aka protobuf)
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Files
lib/protox.ex
defmodule Protox do
@moduledoc ~S'''
Use this module to generate the Elixir modules from a set of protobuf definitions:
defmodule Foo do
use Protox, files: [
"./defs/foo.proto",
"./defs/bar.proto",
"./defs/baz/fiz.proto",
]
end
It's also possible to directly give a schema:
defmodule Bar do
use Protox, schema: """
syntax = "proto3";
package fiz;
message Baz {
}
message Foo {
map<int32, Baz> b = 2;
}
"""
end
The generated modules respect the package declaration. For instance, in the above example,
both the `Fiz.Baz` and `Fiz.Foo` modules will be generated.
See https://github.com/ahamez/protox/blob/master/README.md for detailed instructions.
'''
defmacro __using__(args) do
{args, _} = Code.eval_quoted(args)
namespace =
case Keyword.get(args, :namespace) do
nil -> nil
n -> n
end
path =
case Keyword.get(args, :path) do
nil -> nil
p -> Path.expand(p)
end
files =
case Keyword.drop(args, [:namespace, :path]) do
schema: <<text::binary>> ->
filename = "#{__CALLER__.module}_#{:sha |> :crypto.hash(text) |> Base.encode16()}.proto"
filepath = [Mix.Project.build_path(), filename] |> Path.join() |> Path.expand()
File.write!(filepath, text)
[filepath]
files: files ->
Enum.map(files, &Path.expand/1)
end
{:ok, file_descriptor_set} = Protox.Protoc.run(files, path)
{enums, messages} = Protox.Parse.parse(file_descriptor_set, namespace)
quote do
unquote(make_external_resources(files))
unquote(Protox.Define.define(enums, messages))
end
end
defp make_external_resources(files) do
Enum.map(files, fn file -> quote(do: @external_resource(unquote(file))) end)
end
end