multi-threading
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199
src/main.rs
199
src/main.rs
@ -1,17 +1,15 @@
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extern crate encoding;
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extern crate textstream;
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extern crate zip;
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use clap::{Parser, ValueEnum};
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use encoding::label::encoding_from_whatwg_label;
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use encoding::Encoding;
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use encoding::EncodingRef;
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use encoding::{DecoderTrap, EncoderTrap};
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use regex::Regex;
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use std::io::{Read, Seek, Write};
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use std::path::PathBuf;
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use std::{fs, io};
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use textstream::TextReader;
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use zip::write::FileOptions;
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use std::fs;
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use std::io::{Read, Write};
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use std::sync::mpsc;
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use std::thread;
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use zip::ZipWriter;
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/// transcode txt files in zip archieve
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@ -31,6 +29,10 @@ struct Cli {
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#[clap(arg_enum, short, long, default_value = "zstd")]
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compression: OutputFileCompression,
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/// output compression level
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#[clap(arg_enum, short='l', long, value_parser = clap::value_parser!(i32).range(1..=9), default_value = "5")]
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compression_level: i32,
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/// filename filter (regex)
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#[clap(short, long, default_value = r#".*\.txt$"#)]
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regex: String,
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@ -68,110 +70,109 @@ impl From<OutputFileCompression> for zip::CompressionMethod {
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}
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}
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struct OutFileDescr<'a> {
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#[derive(Debug)]
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struct FileData {
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name: String,
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options: &'a FileOptions,
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encoding: &'a dyn Encoding,
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trap: EncoderTrap,
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data: Vec<u8>,
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}
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fn read_file(file: impl Read, enc: &dyn Encoding) -> Result<String, Box<dyn std::error::Error>> {
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let buf = io::BufReader::new(file);
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let mut reader = TextReader::new(buf, enc, DecoderTrap::Ignore);
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let mut result = String::new();
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reader.read_to_end(&mut result).or(Err("decode error"))?;
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Ok(result)
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#[derive(Debug)]
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struct FileText {
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name: String,
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text: String,
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}
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fn write_file<T: Seek + Write>(
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arc: &mut ZipWriter<T>,
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f: OutFileDescr,
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data: String,
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) -> Result<(), Box<dyn std::error::Error>> {
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arc.start_file(f.name, *f.options)?;
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let data = f.encoding.encode(data.as_str(), f.trap)?;
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arc.write_all(&data)?;
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Ok(())
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}
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fn reader_task(tx: mpsc::Sender<FileData>, input_filename: String, regex: Regex) {
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let zip_file = fs::File::open(input_filename).unwrap();
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let mut archive = zip::ZipArchive::new(zip_file).unwrap();
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fn process_files<R: Read + Seek>(
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archive: &mut zip::ZipArchive<R>,
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output_filename: String,
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enc_input: &(dyn Encoding + Send + Sync),
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enc_output: &(dyn Encoding + Send + Sync),
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compression: zip::CompressionMethod,
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files: &[PathBuf],
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) -> Result<(), Box<dyn std::error::Error>> {
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if files.is_empty() {
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return Ok(());
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}
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let options = zip::write::FileOptions::default()
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.compression_method(compression)
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.compression_level(Some(9));
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let file_def = OutFileDescr {
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name: String::new(),
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options: &options,
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encoding: enc_output,
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trap: EncoderTrap::Ignore,
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};
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let mut outfile = fs::File::create(output_filename)?;
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let mut zip_writer = ZipWriter::new(&mut outfile);
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for name in files {
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let name_str = name.to_str().ok_or("name to str err")?;
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// read string from file in input zip
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let file = archive.by_name(name_str)?;
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let data = read_file(file, enc_input)?;
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// write string to file in output zip
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let out_file = OutFileDescr {
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name: name_str.to_string(),
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..file_def
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};
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write_file(&mut zip_writer, out_file, data)?;
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}
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zip_writer.finish()?;
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Ok(())
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let args = Cli::parse();
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let regex = Regex::new(&args.regex).unwrap();
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let encoding_input = encoding_from_whatwg_label(&args.from).expect("input encoding");
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let encoding_output = encoding_from_whatwg_label(&args.to).expect("output encoding");
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let compression: zip::CompressionMethod = args.compression.into();
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// open archive just to list files
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let zip_file = fs::File::open(args.src)?;
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let zip_reader = io::BufReader::new(zip_file);
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let mut archive = zip::ZipArchive::new(zip_reader)?;
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let mut source_files: Vec<PathBuf> = (0..archive.len())
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.map(|i| archive.by_index(i).unwrap().mangled_name())
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.filter(|name| regex.is_match(name.to_str().unwrap()))
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let mut source_files: Vec<String> = archive
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.file_names()
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.filter(|name| regex.is_match(name))
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.map(|s| s.to_string())
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.collect();
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println!("processing {} files...", source_files.len());
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source_files.sort();
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let source_files = source_files;
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process_files(
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&mut archive,
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args.dst,
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encoding_input,
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encoding_output,
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compression,
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&source_files,
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)?;
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for name in source_files {
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let mut file = archive.by_name(name.as_str()).unwrap();
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let mut data = Vec::with_capacity(file.size().try_into().unwrap());
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file.read_to_end(&mut data).unwrap();
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drop(file);
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println!("done");
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tx.send(FileData { name, data }).unwrap();
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}
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println!("read done ✅");
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}
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fn decoder_task(rx: mpsc::Receiver<FileData>, tx: mpsc::Sender<FileText>, encoding: EncodingRef) {
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while let Ok(FileData { name, data }) = rx.recv() {
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let text = encoding.decode(&data, DecoderTrap::Ignore).unwrap();
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tx.send(FileText { name, text }).unwrap();
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}
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println!("decode done ✅");
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}
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fn encoder_task(rx: mpsc::Receiver<FileText>, tx: mpsc::Sender<FileData>, encoding: EncodingRef) {
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while let Ok(FileText { name, text }) = rx.recv() {
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let data = encoding.encode(text.as_str(), EncoderTrap::Ignore).unwrap();
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tx.send(FileData { name, data }).unwrap();
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}
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println!("encode done ✅");
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}
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fn writer_task(
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rx: mpsc::Receiver<FileData>,
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output_filename: String,
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compression: zip::CompressionMethod,
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compression_level: i32,
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) {
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let options = zip::write::FileOptions::default()
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.compression_method(compression)
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.compression_level(Some(compression_level));
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let mut outfile = fs::File::create(output_filename).expect("output file");
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let mut zip_writer = ZipWriter::new(&mut outfile);
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while let Ok(FileData { name, data }) = rx.recv() {
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zip_writer.start_file(name, options).unwrap();
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zip_writer.write_all(&data).unwrap();
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}
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zip_writer.finish().unwrap();
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println!("write done ✅");
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let args = Cli::parse();
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let regex = Regex::new(&args.regex).expect("regex");
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let encoding_input = encoding_from_whatwg_label(&args.from).expect("input encoding");
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let encoding_output = encoding_from_whatwg_label(&args.to).expect("output encoding");
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let compression: zip::CompressionMethod = args.compression.into();
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let compression_level = args.compression_level;
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let input_filename = args.src;
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let output_filename = args.dst;
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let (reader_tx, reader_rx) = mpsc::channel::<FileData>();
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let (decoder_tx, decoder_rx) = mpsc::channel::<FileText>();
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let (encoder_tx, encoder_rx) = mpsc::channel::<FileData>();
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let handles = vec![
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thread::spawn(move || reader_task(reader_tx, input_filename, regex)),
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thread::spawn(move || decoder_task(reader_rx, decoder_tx, encoding_input)),
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thread::spawn(move || encoder_task(decoder_rx, encoder_tx, encoding_output)),
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thread::spawn(move || {
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writer_task(encoder_rx, output_filename, compression, compression_level)
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}),
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];
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for handle in handles {
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handle.join().expect("thread paniced");
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}
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println!("all done ✅");
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Ok(())
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}
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