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use std::env;
use std::fs::File;
use std::io::{Read, Write};
use std::path::Path;
use std::process::Command;
use std::str::from_utf8;
use protobuf::Message;
use regex::Regex;
use crate::Builder;
fn get_protoc() -> String {
if let Ok(s) = env::var("PROTOC") {
check_protoc_version(&s).expect("PROTOC version not usable");
return s;
}
if let Ok(s) = check_protoc_version("protoc") {
return s;
}
let protoc_bin_name = match (env::consts::OS, env::consts::ARCH) {
("linux", "x86") => "protoc-linux-x86_32",
("linux", "x86_64") => "protoc-linux-x86_64",
("linux", "aarch64") => "protoc-linux-aarch_64",
("linux", "powerpc64") => "protoc-linux-ppcle_64",
("macos", "x86_64") => "protoc-osx-x86_64",
("windows", _) => "protoc-win32.exe",
_ => panic!("No suitable `protoc` (>= 3.1.0) found in PATH"),
};
let bin_path = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
.join("bin")
.join(protoc_bin_name);
bin_path.display().to_string()
}
fn check_protoc_version(protoc: &str) -> Result<String, ()> {
let ver_re = Regex::new(r"([0-9]+)\.([0-9]+)\.[0-9]").unwrap();
let output = Command::new(protoc).arg("--version").output();
match output {
Ok(o) => {
let caps = ver_re.captures(from_utf8(&o.stdout).unwrap()).unwrap();
let major = caps.get(1).unwrap().as_str().parse::<i16>().unwrap();
let minor = caps.get(2).unwrap().as_str().parse::<i16>().unwrap();
if major == 3 && minor >= 1 {
return Ok(protoc.to_owned());
}
println!("The system `protoc` version mismatch, require >= 3.1.0, got {}.{}.x, fallback to the bundled `protoc`", major, minor);
}
Err(_) => println!("`protoc` not in PATH, try using the bundled protoc"),
};
Err(())
}
impl Builder {
pub fn generate_files(&self) {
let mut cmd = Command::new(get_protoc());
let desc_file = format!("{}/mod.desc", self.out_dir);
for i in &self.includes {
cmd.arg(format!("-I{}", i));
}
cmd.arg("--include_imports")
.arg("--include_source_info")
.arg("-o")
.arg(&desc_file);
for f in &self.files {
cmd.arg(f);
}
println!("executing {:?}", cmd);
match cmd.status() {
Ok(e) if e.success() => {}
e => panic!("failed to generate descriptor set files: {:?}", e),
}
let desc_bytes = std::fs::read(&desc_file).unwrap();
let mut desc = protobuf::descriptor::FileDescriptorSet::new();
desc.merge_from_bytes(&desc_bytes).unwrap();
desc.check_initialized().unwrap();
let mut files_to_generate = Vec::new();
'outer: for file in &self.files {
for include in &self.includes {
if let Ok(truncated) = Path::new(file).strip_prefix(include) {
files_to_generate.push(format!("{}", truncated.display()));
continue 'outer;
}
}
panic!(
"file {:?} is not found in includes {:?}",
file, self.includes
);
}
protobuf_codegen::gen_and_write(
desc.get_file(),
&files_to_generate,
&Path::new(&self.out_dir),
&protobuf_codegen::Customize::default(),
)
.unwrap();
self.generate_grpcio(&desc.get_file(), &files_to_generate);
self.import_grpcio();
self.replace_read_unknown_fields();
}
fn replace_read_unknown_fields(&self) {
let regex =
Regex::new(r"::protobuf::rt::read_proto3_enum_with_unknown_fields_into\(([^,]+), ([^,]+), &mut ([^,]+), [^\)]+\)\?").unwrap();
self.list_rs_files().for_each(|path| {
let mut text = String::new();
let mut f = File::open(&path).unwrap();
f.read_to_string(&mut text)
.expect("Couldn't read source file");
#[rustfmt::skip]
let text = {
regex.replace_all(
&text,
"if $1 == ::protobuf::wire_format::WireTypeVarint {\
$3 = $2.read_enum()?;\
} else {\
return ::std::result::Result::Err(::protobuf::rt::unexpected_wire_type(wire_type));\
}",
)
};
let mut out = File::create(&path).unwrap();
out.write_all(text.as_bytes())
.expect("Could not write source file");
});
}
#[cfg(feature = "grpcio-protobuf-codec")]
fn import_grpcio(&self) {
use std::collections::BTreeMap;
use std::fs::OpenOptions;
if !self.re_export_services {
return;
}
let paths: BTreeMap<_, _> = self
.list_rs_files()
.map(|path| (path.file_stem().unwrap().to_str().unwrap().to_owned(), path))
.collect();
for (name, path) in &paths {
if name.starts_with("wrapper_")
|| *name == "mod"
|| name.ends_with("_grpc")
|| !paths.contains_key(&*format!("{}_grpc", name))
{
continue;
}
let mut out = OpenOptions::new()
.append(true)
.open(&path)
.expect("Couldn't open source file");
writeln!(out, "pub use super::{}_grpc::*;", name).expect("Could not write source file");
}
}
#[cfg(not(feature = "grpcio-protobuf-codec"))]
fn import_grpcio(&self) {}
#[cfg(feature = "grpcio-protobuf-codec")]
fn generate_grpcio(
&self,
desc: &[protobuf::descriptor::FileDescriptorProto],
files_to_generate: &[String],
) {
let output_dir = std::path::Path::new(&self.out_dir);
let results = grpcio_compiler::codegen::gen(desc, &files_to_generate);
for res in results {
let out_file = output_dir.join(&res.name);
let mut f = std::fs::File::create(&out_file).unwrap();
f.write_all(&res.content).unwrap();
}
}
#[cfg(not(feature = "grpcio-protobuf-codec"))]
fn generate_grpcio(&self, _: &[protobuf::descriptor::FileDescriptorProto], _: &[String]) {}
}