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config.rs
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config.rs
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use std::{
borrow::ToOwned,
env, fs,
io::{self, Read},
path::{Path, PathBuf},
sync::atomic::{AtomicBool, Ordering},
};
use log::{debug, info, warn};
use qsv_sniffer::{SampleSize, Sniffer};
use serde::de::{Deserialize, Deserializer, Error};
use crate::{
index::Indexed,
select::{SelectColumns, Selection},
util, CliResult,
};
// rdr default is 8k in csv crate, we're making it 128k
pub const DEFAULT_RDR_BUFFER_CAPACITY: usize = 128 * (1 << 10);
// previous wtr default in xsv is 32k, we're making it 512k
pub const DEFAULT_WTR_BUFFER_CAPACITY: usize = 512 * (1 << 10);
// number of rows for qsv_sniffer to sample
const DEFAULT_SNIFFER_SAMPLE: usize = 100;
// file size at which we warn user that a large file has not been indexed
const NO_INDEX_WARNING_FILESIZE: u64 = 100_000_000; // 100MB
// so we don't have to keep checking if the index has been created
static AUTO_INDEXED: AtomicBool = AtomicBool::new(false);
#[derive(Clone, Copy, Debug)]
pub struct Delimiter(pub u8);
/// Delimiter represents values that can be passed from the command line that
/// can be used as a field delimiter in CSV data.
///
/// Its purpose is to ensure that the Unicode character given decodes to a
/// valid ASCII character as required by the CSV parser.
impl Delimiter {
pub const fn as_byte(self) -> u8 {
self.0
}
pub fn decode_delimiter(s: &str) -> Result<Delimiter, String> {
if s == r"\t" {
return Ok(Delimiter(b'\t'));
}
if s.len() != 1 {
return fail_format!("Could not convert '{s}' to a single ASCII character.");
}
let c = s.chars().next().unwrap();
if c.is_ascii() {
Ok(Delimiter(c as u8))
} else {
fail_format!("Could not convert '{c}' to ASCII delimiter.")
}
}
}
impl<'de> Deserialize<'de> for Delimiter {
fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Delimiter, D::Error> {
let s = String::deserialize(d)?;
match Delimiter::decode_delimiter(&s) {
Ok(delim) => Ok(delim),
Err(msg) => Err(D::Error::custom(msg)),
}
}
}
#[derive(Debug)]
pub struct Config {
pub path: Option<PathBuf>, // None implies <stdin>
idx_path: Option<PathBuf>,
select_columns: Option<SelectColumns>,
delimiter: u8,
pub no_headers: bool,
flexible: bool,
terminator: csv::Terminator,
pub quote: u8,
quote_style: csv::QuoteStyle,
double_quote: bool,
escape: Option<u8>,
quoting: bool,
pub preamble_rows: u64,
trim: csv::Trim,
autoindex_size: u64,
prefer_dmy: bool,
comment: Option<u8>,
snappy: bool, // flag to enable snappy compression/decompression
}
// Empty trait as an alias for Seek and Read that avoids auto trait errors
pub trait SeekRead: io::Seek + io::Read {}
impl<T: io::Seek + io::Read> SeekRead for T {}
impl Config {
pub fn new(path: &Option<String>) -> Config {
let default_delim = match env::var("QSV_DEFAULT_DELIMITER") {
Ok(delim) => Delimiter::decode_delimiter(&delim).unwrap().as_byte(),
_ => b',',
};
let (path, mut delim, snappy) = match *path {
None => (None, default_delim, false),
Some(ref s) if &**s == "-" => (None, default_delim, false),
Some(ref s) => {
let path = PathBuf::from(s);
let file_extension = path
.extension()
.unwrap_or_default()
.to_str()
.unwrap()
.to_lowercase();
let mut snappy = false;
let delim = if file_extension == "tsv" || file_extension == "tab" {
b'\t'
} else if file_extension == "csv" {
b','
} else {
let filename = path.file_name().unwrap().to_str().unwrap();
if filename.ends_with(".csv.sz") {
snappy = true;
b','
} else if filename.ends_with(".tsv.sz") || filename.ends_with(".tab.sz") {
snappy = true;
b'\t'
} else {
default_delim
}
};
(Some(path), delim, snappy || file_extension.ends_with("sz"))
},
};
let sniff = util::get_envvar_flag("QSV_SNIFF_DELIMITER")
|| util::get_envvar_flag("QSV_SNIFF_PREAMBLE");
let mut preamble = 0_u64;
if sniff && path.is_some() {
let sniff_path = path.as_ref().unwrap().to_str().unwrap();
match Sniffer::new()
.sample_size(SampleSize::Records(DEFAULT_SNIFFER_SAMPLE))
.sniff_path(sniff_path)
{
Ok(metadata) => {
delim = metadata.dialect.delimiter;
preamble = metadata.dialect.header.num_preamble_rows as u64;
info!(
"sniffed delimiter {} and {preamble} preamble rows",
delim as char
);
},
Err(e) => {
// we only warn, as we don't want to stop processing the file
// if sniffing doesn't work
warn!("sniff error: {e}");
},
}
}
Config {
path,
idx_path: None,
select_columns: None,
delimiter: delim,
no_headers: false,
flexible: false,
terminator: csv::Terminator::Any(b'\n'),
quote: b'"',
quote_style: csv::QuoteStyle::Necessary,
double_quote: true,
escape: None,
quoting: true,
preamble_rows: preamble,
trim: csv::Trim::None,
autoindex_size: std::env::var("QSV_AUTOINDEX_SIZE")
.unwrap_or_else(|_| "0".to_owned())
.parse()
.unwrap_or(0),
prefer_dmy: util::get_envvar_flag("QSV_PREFER_DMY"),
comment: None,
snappy,
}
}
pub const fn delimiter(mut self, d: Option<Delimiter>) -> Config {
if let Some(d) = d {
self.delimiter = d.as_byte();
}
self
}
pub const fn get_delimiter(&self) -> u8 {
self.delimiter
}
pub const fn comment(mut self, c: Option<u8>) -> Config {
self.comment = c;
self
}
pub const fn get_dmy_preference(&self) -> bool {
self.prefer_dmy
}
pub fn no_headers(mut self, mut yes: bool) -> Config {
if env::var("QSV_TOGGLE_HEADERS").unwrap_or_else(|_| "0".to_owned()) == "1" {
yes = !yes;
}
if util::get_envvar_flag("QSV_NO_HEADERS") {
self.no_headers = true;
} else {
self.no_headers = yes;
}
self
}
pub const fn flexible(mut self, yes: bool) -> Config {
self.flexible = yes;
self
}
#[cfg(any(feature = "feature_capable", feature = "lite"))]
pub const fn crlf(mut self, yes: bool) -> Config {
if yes {
self.terminator = csv::Terminator::CRLF;
} else {
self.terminator = csv::Terminator::Any(b'\n');
}
self
}
#[cfg(any(feature = "feature_capable", feature = "lite"))]
pub const fn terminator(mut self, term: csv::Terminator) -> Config {
self.terminator = term;
self
}
pub const fn quote(mut self, quote: u8) -> Config {
self.quote = quote;
self
}
pub const fn quote_style(mut self, style: csv::QuoteStyle) -> Config {
self.quote_style = style;
self
}
pub const fn double_quote(mut self, yes: bool) -> Config {
self.double_quote = yes;
self
}
pub const fn escape(mut self, escape: Option<u8>) -> Config {
self.escape = escape;
self
}
pub const fn quoting(mut self, yes: bool) -> Config {
self.quoting = yes;
self
}
pub const fn trim(mut self, trim_type: csv::Trim) -> Config {
self.trim = trim_type;
self
}
#[allow(clippy::missing_const_for_fn)]
pub fn select(mut self, sel_cols: SelectColumns) -> Config {
self.select_columns = Some(sel_cols);
self
}
pub const fn is_stdin(&self) -> bool {
self.path.is_none()
}
// comment out for now until we have a use case for this
// pub const fn is_snappy(&self) -> bool {
// self.snappy
// }
#[inline]
pub fn selection(&self, first_record: &csv::ByteRecord) -> Result<Selection, String> {
match self.select_columns {
None => fail!("Config has no 'SelectColumns'. Did you call Config::select?"),
Some(ref sel) => sel.selection(first_record, !self.no_headers),
}
}
pub fn write_headers<R: io::Read, W: io::Write>(
&self,
r: &mut csv::Reader<R>,
w: &mut csv::Writer<W>,
) -> csv::Result<()> {
if !self.no_headers {
let r = r.byte_headers()?;
if !r.is_empty() {
w.write_record(r)?;
}
}
Ok(())
}
pub fn writer(&self) -> io::Result<csv::Writer<Box<dyn io::Write + 'static>>> {
Ok(self.from_writer(self.io_writer()?))
}
pub fn reader(&self) -> io::Result<csv::Reader<Box<dyn io::Read + Send + 'static>>> {
Ok(self.from_reader(self.io_reader()?))
}
pub fn reader_file(&self) -> io::Result<csv::Reader<fs::File>> {
match self.path {
None => Err(io::Error::new(
io::ErrorKind::InvalidInput,
"Cannot use <stdin> here",
)),
Some(ref p) => fs::File::open(p).map(|f| self.from_reader(f)),
}
}
#[cfg(any(feature = "feature_capable", feature = "lite"))]
pub fn reader_file_stdin(&self) -> io::Result<csv::Reader<Box<dyn SeekRead + 'static>>> {
Ok(match self.path {
None => {
// Create a buffer in memory when stdin needs to be indexed
let mut buffer: Vec<u8> = Vec::new();
let stdin = io::stdin();
stdin.lock().read_to_end(&mut buffer)?;
self.from_reader(Box::new(io::Cursor::new(buffer)))
},
Some(ref p) => self.from_reader(Box::new(fs::File::open(p).unwrap())),
})
}
fn autoindex_file(&self) {
// autoindex_file should never panic. It should silently fail as its a "convenience fn"
// that's why we have a lot of let-else returns, in lieu of unwraps
if self.snappy {
// cannot index snappy compressed files
return;
}
let Some(path_buf) = &self.path else { return };
let pidx = util::idx_path(Path::new(path_buf));
let Ok(idxfile) = fs::File::create(pidx) else {
return;
};
let Ok(mut rdr) = self.reader_file() else {
return;
};
let mut wtr = io::BufWriter::with_capacity(DEFAULT_WTR_BUFFER_CAPACITY, idxfile);
match csv_index::RandomAccessSimple::create(&mut rdr, &mut wtr) {
Ok(()) => {
let Ok(()) = io::Write::flush(&mut wtr) else {
return;
};
debug!("autoindex of {path_buf:?} successful.");
AUTO_INDEXED.store(true, Ordering::Relaxed);
},
Err(e) => debug!("autoindex of {path_buf:?} failed: {e}"),
}
}
/// Check if the index file exists and is newer than the CSV file.
/// If so, return the CSV file handle and the index file handle. If not, return None.
/// Unless the CSV's file size >= QSV_AUTOINDEX_SIZE, then we'll create an index automatically.
/// This will also automatically update stale indices (i.e. the CSV is newer than the index )
pub fn index_files(&self) -> io::Result<Option<(csv::Reader<fs::File>, fs::File)>> {
let mut data_modified = 0_u64;
let data_fsize;
let mut idx_path_work = PathBuf::new();
// the auto_indexed flag is set when an index is created automatically with
// autoindex_file(). We use this flag to avoid checking if the index exists every
// time this function is called. If the index was already auto-indexed, we can just
// use it & return immediately.
let auto_indexed = AUTO_INDEXED.load(Ordering::Relaxed);
let (csv_file, mut idx_file) = if auto_indexed {
(
fs::File::open(self.path.clone().unwrap())?,
fs::File::open(util::idx_path(&self.path.clone().unwrap()))?,
)
} else {
match (&self.path, &self.idx_path) {
(&None, &None) => return Ok(None),
(&None, &Some(_)) => {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"Cannot use <stdin> with indexes",
));
},
(Some(p), Some(ip)) => (fs::File::open(p)?, fs::File::open(ip)?),
(Some(p), &None) => {
// We generally don't want to report an error here, since we're
// passively trying to find an index.
(data_modified, data_fsize) = util::file_metadata(&p.metadata()?);
idx_path_work = util::idx_path(p);
let idx_file = match fs::File::open(&idx_path_work) {
Err(_) => {
// the index file doesn't exist
if self.snappy {
// cannot index snappy compressed files
return Ok(None);
} else if self.autoindex_size > 0 && data_fsize >= self.autoindex_size {
// if CSV file size >= QSV_AUTOINDEX_SIZE, and
// its not a snappy file, create an index automatically
self.autoindex_file();
fs::File::open(&idx_path_work)?
} else if data_fsize >= NO_INDEX_WARNING_FILESIZE {
// warn user that the CSV file is large and not indexed
use indicatif::HumanCount;
warn!(
"The {} MB CSV file is larger than the {} MB \
NO_INDEX_WARNING_FILESIZE threshold. Consider creating an \
index file as it will make qsv commands much faster.",
HumanCount(data_fsize * 100),
HumanCount(NO_INDEX_WARNING_FILESIZE * 100)
);
return Ok(None);
} else {
// CSV not greater than QSV_AUTOINDEX_SIZE, and not greater than
// NO_INDEX_WARNING_FILESIZE, so we don't create an index
return Ok(None);
}
},
Ok(f) => f,
};
(fs::File::open(p)?, idx_file)
},
}
};
// If the CSV data was last modified after the index file was last
// modified, recreate the stale index automatically
let (idx_modified, _) = util::file_metadata(&idx_file.metadata()?);
if data_modified > idx_modified {
info!("index stale... autoindexing...");
self.autoindex_file();
idx_file = fs::File::open(&idx_path_work)?;
}
let csv_rdr = self.from_reader(csv_file);
Ok(Some((csv_rdr, idx_file)))
}
/// Check if the index file exists and is newer than the CSV file.
/// If so, return the index file.
/// If not, return None.
/// Unless QSV_AUTOINDEX is set, in which case, we'll recreate the
/// stale index automatically
#[inline]
pub fn indexed(&self) -> CliResult<Option<Indexed<fs::File, fs::File>>> {
match self.index_files()? {
None => Ok(None),
Some((r, i)) => Ok(Some(Indexed::open(r, i)?)),
}
}
pub fn io_reader(&self) -> io::Result<Box<dyn io::Read + Send + 'static>> {
Ok(match self.path {
None => Box::new(io::stdin()),
Some(ref p) => match fs::File::open(p) {
Ok(x) => {
if self.snappy {
info!("decoding snappy-compressed file: {}", p.display());
Box::new(snap::read::FrameDecoder::new(x))
} else {
Box::new(x)
}
},
Err(err) => {
let msg = format!("failed to open {}: {}", p.display(), err);
return Err(io::Error::new(io::ErrorKind::NotFound, msg));
},
},
})
}
#[allow(clippy::wrong_self_convention)]
pub fn from_reader<R: Read>(&self, rdr: R) -> csv::Reader<R> {
let rdr_capacitys = env::var("QSV_RDR_BUFFER_CAPACITY")
.unwrap_or_else(|_| DEFAULT_RDR_BUFFER_CAPACITY.to_string());
let rdr_buffer: usize = rdr_capacitys.parse().unwrap_or(DEFAULT_RDR_BUFFER_CAPACITY);
let rdr_comment: Option<u8> = if let Ok(comment_char) = env::var("QSV_COMMENT_CHAR") {
Some(comment_char.as_bytes().first().unwrap().to_owned())
} else {
self.comment
};
csv::ReaderBuilder::new()
.flexible(self.flexible)
.delimiter(self.delimiter)
.has_headers(!self.no_headers)
.quote(self.quote)
.quoting(self.quoting)
.escape(self.escape)
.buffer_capacity(rdr_buffer)
.comment(rdr_comment)
.trim(self.trim)
.from_reader(rdr)
}
pub fn io_writer(&self) -> io::Result<Box<dyn io::Write + 'static>> {
Ok(match self.path {
None => Box::new(io::stdout()),
Some(ref p) => {
let p_str = p.as_os_str();
if p_str == "sink" {
// sink is /dev/null
Box::new(io::sink())
} else if self.snappy {
info!("writing snappy-compressed file: {p:?}");
Box::new(snap::write::FrameEncoder::new(fs::File::create(p)?))
} else {
Box::new(fs::File::create(p)?)
}
},
})
}
#[allow(clippy::wrong_self_convention)]
pub fn from_writer<W: io::Write>(&self, mut wtr: W) -> csv::Writer<W> {
let wtr_capacitys = env::var("QSV_WTR_BUFFER_CAPACITY")
.unwrap_or_else(|_| DEFAULT_WTR_BUFFER_CAPACITY.to_string());
let wtr_buffer: usize = wtr_capacitys.parse().unwrap_or(DEFAULT_WTR_BUFFER_CAPACITY);
if util::get_envvar_flag("QSV_OUTPUT_BOM") {
wtr.write_all("\u{FEFF}".as_bytes()).unwrap();
}
csv::WriterBuilder::new()
.flexible(self.flexible)
.delimiter(self.delimiter)
.terminator(self.terminator)
.quote(self.quote)
.quote_style(self.quote_style)
.double_quote(self.double_quote)
.escape(self.escape.unwrap_or(b'\\'))
.buffer_capacity(wtr_buffer)
.from_writer(wtr)
}
}