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extern crate tempdir;
extern crate grpc_compiler;
extern crate protobuf;
extern crate protoc;
extern crate protoc_rust;
use std::fs;
use std::io;
use std::io::Read;
use std::io::Write;
pub type Error = io::Error;
pub type Result<T> = io::Result<T>;
#[derive(Debug, Default)]
pub struct Args<'a> {
pub out_dir: &'a str,
pub includes: &'a [&'a str],
pub input: &'a [&'a str],
pub rust_protobuf: bool,
}
pub fn run(args: Args) -> Result<()> {
let protoc = protoc::Protoc::from_env_path();
let version = protoc.version().expect("protoc version");
if !version.is_3() {
panic!("protobuf must have version 3");
}
if args.rust_protobuf {
protoc_rust::run(protoc_rust::Args {
out_dir: args.out_dir,
includes: args.includes,
input: args.input,
..Default::default()
})?;
}
let temp_dir = tempdir::TempDir::new("protoc-rust")?;
let temp_file = temp_dir.path().join("descriptor.pbbin");
let temp_file = temp_file.to_str().expect("utf-8 file name");
protoc.write_descriptor_set(protoc::DescriptorSetOutArgs {
out: temp_file,
includes: args.includes,
input: args.input,
include_imports: true,
})?;
let mut fds = Vec::new();
let mut file = fs::File::open(temp_file)?;
file.read_to_end(&mut fds)?;
drop(file);
drop(temp_dir);
let fds: protobuf::descriptor::FileDescriptorSet =
protobuf::parse_from_bytes(&fds).map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
let mut includes = args.includes;
if includes.is_empty() {
static DOT_SLICE: &'static [&'static str] = &["."];
includes = DOT_SLICE;
}
let mut files_to_generate = Vec::new();
'outer: for file in args.input {
for include in includes {
if let Some(truncated) = remove_path_prefix(file, include) {
files_to_generate.push(truncated.to_owned());
continue 'outer;
}
}
return Err(Error::new(
io::ErrorKind::Other,
format!(
"file {:?} is not found in includes {:?}",
file, args.includes
),
));
}
let gen_result = grpc_compiler::codegen::gen(fds.get_file(), &files_to_generate);
for r in gen_result {
let r: protobuf::compiler_plugin::GenResult = r;
let file = format!("{}/{}", args.out_dir, r.name);
let mut file = fs::File::create(&file)?;
file.write_all(&r.content)?;
file.flush()?;
}
Ok(())
}
fn remove_dot_slash(path: &str) -> &str {
if path == "." {
""
} else if path.starts_with("./") || path.starts_with(".\\") {
&path[2..]
} else {
path
}
}
fn remove_path_prefix<'a>(mut path: &'a str, mut prefix: &str) -> Option<&'a str> {
path = remove_dot_slash(path);
prefix = remove_dot_slash(prefix);
if prefix == "" {
return Some(path);
}
if prefix.ends_with("/") || prefix.ends_with("\\") {
prefix = &prefix[..prefix.len() - 1];
}
if !path.starts_with(prefix) {
return None;
}
if path.len() <= prefix.len() {
return None;
}
if path.as_bytes()[prefix.len()] == b'/' || path.as_bytes()[prefix.len()] == b'\\' {
return Some(&path[prefix.len() + 1..]);
} else {
return None;
}
}
#[cfg(test)]
mod test {
#[test]
fn remove_path_prefix() {
assert_eq!(
Some("abc.proto"),
super::remove_path_prefix("xxx/abc.proto", "xxx")
);
assert_eq!(
Some("abc.proto"),
super::remove_path_prefix("xxx/abc.proto", "xxx/")
);
assert_eq!(
Some("abc.proto"),
super::remove_path_prefix("../xxx/abc.proto", "../xxx/")
);
assert_eq!(
Some("abc.proto"),
super::remove_path_prefix("abc.proto", ".")
);
assert_eq!(
Some("abc.proto"),
super::remove_path_prefix("abc.proto", "./")
);
assert_eq!(None, super::remove_path_prefix("xxx/abc.proto", "yyy"));
assert_eq!(None, super::remove_path_prefix("xxx/abc.proto", "yyy/"));
}
}