prost-wkt-types 0.6.0

Helper crate for prost to allow JSON serialization and deserialization of Well Known Types.
Documentation 
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use std::env;
use std::fs::create_dir_all;
use std::path::{Path, PathBuf};

use prost::Message;
use prost_types::FileDescriptorSet;

fn main() {
    #[cfg(feature = "vendored-protoc")]
    std::env::set_var("PROTOC", protobuf_src::protoc());

    let dir = PathBuf::from(env::var("OUT_DIR").unwrap());

    build(&dir, "pbtime");
    build(&dir, "pbstruct");
    build(&dir, "pbany");
    build(&dir, "pbempty");
    build(&dir, "pbmask");
}

fn build(dir: &Path, proto: &str) {
    let out = dir.join(proto);
    create_dir_all(&out).unwrap();
    let source = format!("proto/{proto}.proto");
    let descriptor_file = out.join("descriptors.bin");
    let mut prost_build = prost_build::Config::new();

    #[cfg(feature = "vendored-protox")]
    {
        let file_descriptors = protox::compile([source.clone()], ["proto/".to_string()]).unwrap();
        std::fs::write(&descriptor_file, file_descriptors.encode_to_vec()).unwrap();
        prost_build.skip_protoc_run();
    }

    prost_build
        .compile_well_known_types()
        .type_attribute("google.protobuf.Empty","#[derive(serde_derive::Serialize, serde_derive::Deserialize)]")
        .type_attribute("google.protobuf.FieldMask","#[derive(serde_derive::Serialize, serde_derive::Deserialize)]")
        .file_descriptor_set_path(&descriptor_file)
        .out_dir(&out)
        .compile_protos(
            &[
                source
            ],
            &["proto/".to_string()],
        )
        .unwrap();

    let descriptor_bytes = std::fs::read(descriptor_file).unwrap();
    let descriptor = FileDescriptorSet::decode(&descriptor_bytes[..]).unwrap();

    prost_wkt_build::add_serde(out, descriptor);
}