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use std::{
io,
path::{Path, PathBuf},
time::Duration,
};
use {
grep::{
cli,
matcher::Matcher,
printer::{Standard, Stats, Summary, JSON},
regex::RegexMatcher as RustRegexMatcher,
searcher::{BinaryDetection, Searcher},
},
ignore::overrides::Override,
serde_json::{self as json, json},
termcolor::WriteColor,
};
#[cfg(feature = "pcre2")]
use grep::pcre2::RegexMatcher as PCRE2RegexMatcher;
use crate::subject::Subject;
/// The configuration for the search worker. Among a few other things, the
/// configuration primarily controls the way we show search results to users
/// at a very high level.
#[derive(Clone, Debug)]
struct Config {
json_stats: bool,
preprocessor: Option<PathBuf>,
preprocessor_globs: Override,
search_zip: bool,
binary_implicit: BinaryDetection,
binary_explicit: BinaryDetection,
}
impl Default for Config {
fn default() -> Config {
Config {
json_stats: false,
preprocessor: None,
preprocessor_globs: Override::empty(),
search_zip: false,
binary_implicit: BinaryDetection::none(),
binary_explicit: BinaryDetection::none(),
}
}
}
/// A builder for configuring and constructing a search worker.
#[derive(Clone, Debug)]
pub struct SearchWorkerBuilder {
config: Config,
command_builder: cli::CommandReaderBuilder,
decomp_builder: cli::DecompressionReaderBuilder,
}
impl Default for SearchWorkerBuilder {
fn default() -> SearchWorkerBuilder {
SearchWorkerBuilder::new()
}
}
impl SearchWorkerBuilder {
/// Create a new builder for configuring and constructing a search worker.
pub fn new() -> SearchWorkerBuilder {
let mut cmd_builder = cli::CommandReaderBuilder::new();
cmd_builder.async_stderr(true);
let mut decomp_builder = cli::DecompressionReaderBuilder::new();
decomp_builder.async_stderr(true);
SearchWorkerBuilder {
config: Config::default(),
command_builder: cmd_builder,
decomp_builder,
}
}
/// Create a new search worker using the given searcher, matcher and
/// printer.
pub fn build<W: WriteColor>(
&self,
matcher: PatternMatcher,
searcher: Searcher,
printer: Printer<W>,
) -> SearchWorker<W> {
let config = self.config.clone();
let command_builder = self.command_builder.clone();
let decomp_builder = self.decomp_builder.clone();
SearchWorker {
config,
command_builder,
decomp_builder,
matcher,
searcher,
printer,
}
}
/// Forcefully use JSON to emit statistics, even if the underlying printer
/// is not the JSON printer.
///
/// This is useful for implementing flag combinations like
/// `--json --quiet`, which uses the summary printer for implementing
/// `--quiet` but still wants to emit summary statistics, which should
/// be JSON formatted because of the `--json` flag.
pub fn json_stats(&mut self, yes: bool) -> &mut SearchWorkerBuilder {
self.config.json_stats = yes;
self
}
/// Set the path to a preprocessor command.
///
/// When this is set, instead of searching files directly, the given
/// command will be run with the file path as the first argument, and the
/// output of that command will be searched instead.
pub fn preprocessor(
&mut self,
cmd: Option<PathBuf>,
) -> crate::Result<&mut SearchWorkerBuilder> {
if let Some(ref prog) = cmd {
let bin = cli::resolve_binary(prog)?;
self.config.preprocessor = Some(bin);
} else {
self.config.preprocessor = None;
}
Ok(self)
}
/// Set the globs for determining which files should be run through the
/// preprocessor. By default, with no globs and a preprocessor specified,
/// every file is run through the preprocessor.
pub fn preprocessor_globs(
&mut self,
globs: Override,
) -> &mut SearchWorkerBuilder {
self.config.preprocessor_globs = globs;
self
}
/// Enable the decompression and searching of common compressed files.
///
/// When enabled, if a particular file path is recognized as a compressed
/// file, then it is decompressed before searching.
///
/// Note that if a preprocessor command is set, then it overrides this
/// setting.
pub fn search_zip(&mut self, yes: bool) -> &mut SearchWorkerBuilder {
self.config.search_zip = yes;
self
}
/// Set the binary detection that should be used when searching files
/// found via a recursive directory search.
///
/// Generally, this binary detection may be `BinaryDetection::quit` if
/// we want to skip binary files completely.
///
/// By default, no binary detection is performed.
pub fn binary_detection_implicit(
&mut self,
detection: BinaryDetection,
) -> &mut SearchWorkerBuilder {
self.config.binary_implicit = detection;
self
}
/// Set the binary detection that should be used when searching files
/// explicitly supplied by an end user.
///
/// Generally, this binary detection should NOT be `BinaryDetection::quit`,
/// since we never want to automatically filter files supplied by the end
/// user.
///
/// By default, no binary detection is performed.
pub fn binary_detection_explicit(
&mut self,
detection: BinaryDetection,
) -> &mut SearchWorkerBuilder {
self.config.binary_explicit = detection;
self
}
}
/// The result of executing a search.
///
/// Generally speaking, the "result" of a search is sent to a printer, which
/// writes results to an underlying writer such as stdout or a file. However,
/// every search also has some aggregate statistics or meta data that may be
/// useful to higher level routines.
#[derive(Clone, Debug, Default)]
pub struct SearchResult {
has_match: bool,
stats: Option<Stats>,
}
impl SearchResult {
/// Whether the search found a match or not.
pub fn has_match(&self) -> bool {
self.has_match
}
/// Return aggregate search statistics for a single search, if available.
///
/// It can be expensive to compute statistics, so these are only present
/// if explicitly enabled in the printer provided by the caller.
pub fn stats(&self) -> Option<&Stats> {
self.stats.as_ref()
}
}
/// The pattern matcher used by a search worker.
#[derive(Clone, Debug)]
pub enum PatternMatcher {
RustRegex(RustRegexMatcher),
#[cfg(feature = "pcre2")]
PCRE2(PCRE2RegexMatcher),
}
/// The printer used by a search worker.
///
/// The `W` type parameter refers to the type of the underlying writer.
#[derive(Debug)]
pub enum Printer<W> {
/// Use the standard printer, which supports the classic grep-like format.
Standard(Standard<W>),
/// Use the summary printer, which supports aggregate displays of search
/// results.
Summary(Summary<W>),
/// A JSON printer, which emits results in the JSON Lines format.
JSON(JSON<W>),
}
impl<W: WriteColor> Printer<W> {
fn print_stats(
&mut self,
total_duration: Duration,
stats: &Stats,
) -> io::Result<()> {
match *self {
Printer::JSON(_) => self.print_stats_json(total_duration, stats),
Printer::Standard(_) | Printer::Summary(_) => {
self.print_stats_human(total_duration, stats)
}
}
}
fn print_stats_human(
&mut self,
total_duration: Duration,
stats: &Stats,
) -> io::Result<()> {
write!(
self.get_mut(),
"
{matches} matches
{lines} matched lines
{searches_with_match} files contained matches
{searches} files searched
{bytes_printed} bytes printed
{bytes_searched} bytes searched
{search_time:0.6} seconds spent searching
{process_time:0.6} seconds
",
matches = stats.matches(),
lines = stats.matched_lines(),
searches_with_match = stats.searches_with_match(),
searches = stats.searches(),
bytes_printed = stats.bytes_printed(),
bytes_searched = stats.bytes_searched(),
search_time = fractional_seconds(stats.elapsed()),
process_time = fractional_seconds(total_duration)
)
}
fn print_stats_json(
&mut self,
total_duration: Duration,
stats: &Stats,
) -> io::Result<()> {
// We specifically match the format laid out by the JSON printer in
// the grep-printer crate. We simply "extend" it with the 'summary'
// message type.
let fractional = fractional_seconds(total_duration);
json::to_writer(
self.get_mut(),
&json!({
"type": "summary",
"data": {
"stats": stats,
"elapsed_total": {
"secs": total_duration.as_secs(),
"nanos": total_duration.subsec_nanos(),
"human": format!("{:0.6}s", fractional),
},
}
}),
)?;
write!(self.get_mut(), "\n")
}
/// Return a mutable reference to the underlying printer's writer.
pub fn get_mut(&mut self) -> &mut W {
match *self {
Printer::Standard(ref mut p) => p.get_mut(),
Printer::Summary(ref mut p) => p.get_mut(),
Printer::JSON(ref mut p) => p.get_mut(),
}
}
}
/// A worker for executing searches.
///
/// It is intended for a single worker to execute many searches, and is
/// generally intended to be used from a single thread. When searching using
/// multiple threads, it is better to create a new worker for each thread.
#[derive(Debug)]
pub struct SearchWorker<W> {
config: Config,
command_builder: cli::CommandReaderBuilder,
decomp_builder: cli::DecompressionReaderBuilder,
matcher: PatternMatcher,
searcher: Searcher,
printer: Printer<W>,
}
impl<W: WriteColor> SearchWorker<W> {
/// Execute a search over the given subject.
pub fn search(&mut self, subject: &Subject) -> io::Result<SearchResult> {
let bin = if subject.is_explicit() {
self.config.binary_explicit.clone()
} else {
self.config.binary_implicit.clone()
};
let path = subject.path();
log::trace!("{}: binary detection: {:?}", path.display(), bin);
self.searcher.set_binary_detection(bin);
if subject.is_stdin() {
self.search_reader(path, &mut io::stdin().lock())
} else if self.should_preprocess(path) {
self.search_preprocessor(path)
} else if self.should_decompress(path) {
self.search_decompress(path)
} else {
self.search_path(path)
}
}
/// Return a mutable reference to the underlying printer.
pub fn printer(&mut self) -> &mut Printer<W> {
&mut self.printer
}
/// Print the given statistics to the underlying writer in a way that is
/// consistent with this searcher's printer's format.
///
/// While `Stats` contains a duration itself, this only corresponds to the
/// time spent searching, where as `total_duration` should roughly
/// approximate the lifespan of the ripgrep process itself.
pub fn print_stats(
&mut self,
total_duration: Duration,
stats: &Stats,
) -> io::Result<()> {
if self.config.json_stats {
self.printer().print_stats_json(total_duration, stats)
} else {
self.printer().print_stats(total_duration, stats)
}
}
/// Returns true if and only if the given file path should be
/// decompressed before searching.
fn should_decompress(&self, path: &Path) -> bool {
if !self.config.search_zip {
return false;
}
self.decomp_builder.get_matcher().has_command(path)
}
/// Returns true if and only if the given file path should be run through
/// the preprocessor.
fn should_preprocess(&self, path: &Path) -> bool {
if !self.config.preprocessor.is_some() {
return false;
}
if self.config.preprocessor_globs.is_empty() {
return true;
}
!self.config.preprocessor_globs.matched(path, false).is_ignore()
}
/// Search the given file path by first asking the preprocessor for the
/// data to search instead of opening the path directly.
fn search_preprocessor(
&mut self,
path: &Path,
) -> io::Result<SearchResult> {
let bin = self.config.preprocessor.as_ref().unwrap();
let mut cmd = std::process::Command::new(bin);
cmd.arg(path)
.stdin(std::process::Stdio::from(std::fs::File::open(path)?));
let mut rdr = self.command_builder.build(&mut cmd).map_err(|err| {
io::Error::new(
io::ErrorKind::Other,
format!(
"preprocessor command could not start: '{:?}': {}",
cmd, err,
),
)
})?;
let result = self.search_reader(path, &mut rdr).map_err(|err| {
io::Error::new(
io::ErrorKind::Other,
format!("preprocessor command failed: '{:?}': {}", cmd, err),
)
});
let close_result = rdr.close();
let search_result = result?;
close_result?;
Ok(search_result)
}
/// Attempt to decompress the data at the given file path and search the
/// result. If the given file path isn't recognized as a compressed file,
/// then search it without doing any decompression.
fn search_decompress(&mut self, path: &Path) -> io::Result<SearchResult> {
let mut rdr = self.decomp_builder.build(path)?;
let result = self.search_reader(path, &mut rdr);
let close_result = rdr.close();
let search_result = result?;
close_result?;
Ok(search_result)
}
/// Search the contents of the given file path.
fn search_path(&mut self, path: &Path) -> io::Result<SearchResult> {
use self::PatternMatcher::*;
let (searcher, printer) = (&mut self.searcher, &mut self.printer);
match self.matcher {
RustRegex(ref m) => search_path(m, searcher, printer, path),
#[cfg(feature = "pcre2")]
PCRE2(ref m) => search_path(m, searcher, printer, path),
}
}
/// Executes a search on the given reader, which may or may not correspond
/// directly to the contents of the given file path. Instead, the reader
/// may actually cause something else to be searched (for example, when
/// a preprocessor is set or when decompression is enabled). In those
/// cases, the file path is used for visual purposes only.
///
/// Generally speaking, this method should only be used when there is no
/// other choice. Searching via `search_path` provides more opportunities
/// for optimizations (such as memory maps).
fn search_reader<R: io::Read>(
&mut self,
path: &Path,
rdr: &mut R,
) -> io::Result<SearchResult> {
use self::PatternMatcher::*;
let (searcher, printer) = (&mut self.searcher, &mut self.printer);
match self.matcher {
RustRegex(ref m) => search_reader(m, searcher, printer, path, rdr),
#[cfg(feature = "pcre2")]
PCRE2(ref m) => search_reader(m, searcher, printer, path, rdr),
}
}
}
/// Search the contents of the given file path using the given matcher,
/// searcher and printer.
fn search_path<M: Matcher, W: WriteColor>(
matcher: M,
searcher: &mut Searcher,
printer: &mut Printer<W>,
path: &Path,
) -> io::Result<SearchResult> {
match *printer {
Printer::Standard(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_path(&matcher, path, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: sink.stats().map(|s| s.clone()),
})
}
Printer::Summary(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_path(&matcher, path, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: sink.stats().map(|s| s.clone()),
})
}
Printer::JSON(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_path(&matcher, path, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: Some(sink.stats().clone()),
})
}
}
}
/// Search the contents of the given reader using the given matcher, searcher
/// and printer.
fn search_reader<M: Matcher, R: io::Read, W: WriteColor>(
matcher: M,
searcher: &mut Searcher,
printer: &mut Printer<W>,
path: &Path,
mut rdr: R,
) -> io::Result<SearchResult> {
match *printer {
Printer::Standard(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_reader(&matcher, &mut rdr, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: sink.stats().map(|s| s.clone()),
})
}
Printer::Summary(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_reader(&matcher, &mut rdr, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: sink.stats().map(|s| s.clone()),
})
}
Printer::JSON(ref mut p) => {
let mut sink = p.sink_with_path(&matcher, path);
searcher.search_reader(&matcher, &mut rdr, &mut sink)?;
Ok(SearchResult {
has_match: sink.has_match(),
stats: Some(sink.stats().clone()),
})
}
}
}
/// Return the given duration as fractional seconds.
fn fractional_seconds(duration: Duration) -> f64 {
(duration.as_secs() as f64) + (duration.subsec_nanos() as f64 * 1e-9)
}