MeiliSearch/meilidb-core/examples/from_file.rs

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use std::collections::btree_map::{BTreeMap, Entry};
use std::collections::{HashMap, HashSet};
use std::error::Error;
use std::io::Write;
use std::iter::FromIterator;
use std::path::{Path, PathBuf};
use std::time::{Instant, Duration};
use std::{fs, io};
use rustyline::{Editor, Config};
use serde::{Serialize, Deserialize};
use structopt::StructOpt;
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
use meilidb_core::{Highlight, Database};
use meilidb_schema::SchemaAttr;
const INDEX_NAME: &str = "default";
#[derive(Debug, StructOpt)]
struct IndexCommand {
/// The destination where the database must be created.
#[structopt(parse(from_os_str))]
database_path: PathBuf,
/// The csv file to index.
#[structopt(parse(from_os_str))]
csv_data_path: PathBuf,
/// The path to the schema.
#[structopt(long, parse(from_os_str))]
schema: PathBuf,
#[structopt(long)]
update_group_size: Option<usize>,
}
#[derive(Debug, StructOpt)]
struct SearchCommand {
/// The destination where the database must be created.
#[structopt(parse(from_os_str))]
database_path: PathBuf,
/// Timeout after which the search will return results.
#[structopt(long)]
fetch_timeout_ms: Option<u64>,
/// The number of returned results
#[structopt(short, long, default_value = "10")]
number_results: usize,
/// The number of characters before and after the first match
#[structopt(short = "C", long, default_value = "35")]
char_context: usize,
/// Fields that must be displayed.
displayed_fields: Vec<String>,
}
#[derive(Debug, StructOpt)]
enum Command {
Index(IndexCommand),
Search(SearchCommand),
}
impl Command {
fn path(&self) -> &Path {
match self {
Command::Index(command) => &command.database_path,
Command::Search(command) => &command.database_path,
}
}
}
#[derive(Serialize, Deserialize)]
#[serde(transparent)]
struct Document(HashMap<String, String>);
fn index_command(command: IndexCommand, database: Database) -> Result<(), Box<dyn Error>> {
let start = Instant::now();
let rkv = database.rkv.read().unwrap();
let index = database.open_index(INDEX_NAME)?;
let schema = {
let string = fs::read_to_string(&command.schema)?;
toml::from_str(&string).unwrap()
};
let writer = rkv.write().unwrap();
match index.main.schema(&writer)? {
Some(current_schema) => {
if current_schema != schema {
return Err(meilidb_core::Error::SchemaDiffer.into())
}
writer.abort();
},
None => index.schema_update(writer, schema)?,
}
let mut rdr = csv::Reader::from_path(command.csv_data_path)?;
let mut raw_record = csv::StringRecord::new();
let headers = rdr.headers()?.clone();
let mut max_update_id = 0;
let mut i = 0;
let mut end_of_file = false;
while !end_of_file {
let mut additions = index.documents_addition();
loop {
end_of_file = !rdr.read_record(&mut raw_record)?;
if end_of_file { break }
let document: Document = match raw_record.deserialize(Some(&headers)) {
Ok(document) => document,
Err(e) => {
eprintln!("{:?}", e);
continue;
}
};
additions.update_document(document);
print!("\rindexing document {}", i);
i += 1;
if let Some(group_size) = command.update_group_size {
if i % group_size == 0 { break }
}
}
println!();
let writer = rkv.write().unwrap();
println!("committing update...");
let update_id = additions.finalize(writer)?;
max_update_id = max_update_id.max(update_id);
}
loop {
println!("Waiting for update {}", max_update_id);
let reader = rkv.read().unwrap();
if let Some(_) = index.updates_results.update_result(&reader, max_update_id)? {
break
}
std::thread::sleep(std::time::Duration::from_secs(1));
}
println!("database created in {:.2?} at: {:?}", start.elapsed(), command.database_path);
Ok(())
}
fn display_highlights(text: &str, ranges: &[usize]) -> io::Result<()> {
let mut stdout = StandardStream::stdout(ColorChoice::Always);
let mut highlighted = false;
for range in ranges.windows(2) {
let [start, end] = match range { [start, end] => [*start, *end], _ => unreachable!() };
if highlighted {
stdout.set_color(ColorSpec::new().set_fg(Some(Color::Yellow)))?;
}
write!(&mut stdout, "{}", &text[start..end])?;
stdout.reset()?;
highlighted = !highlighted;
}
Ok(())
}
fn char_to_byte_range(index: usize, length: usize, text: &str) -> (usize, usize) {
let mut byte_index = 0;
let mut byte_length = 0;
for (n, (i, c)) in text.char_indices().enumerate() {
if n == index {
byte_index = i;
}
if n + 1 == index + length {
byte_length = i - byte_index + c.len_utf8();
break;
}
}
(byte_index, byte_length)
}
fn create_highlight_areas(text: &str, highlights: &[Highlight]) -> Vec<usize> {
let mut byte_indexes = BTreeMap::new();
for highlight in highlights {
let char_index = highlight.char_index as usize;
let char_length = highlight.char_length as usize;
let (byte_index, byte_length) = char_to_byte_range(char_index, char_length, text);
match byte_indexes.entry(byte_index) {
Entry::Vacant(entry) => { entry.insert(byte_length); },
Entry::Occupied(mut entry) => {
if *entry.get() < byte_length {
entry.insert(byte_length);
}
},
}
}
let mut title_areas = Vec::new();
title_areas.push(0);
for (byte_index, length) in byte_indexes {
title_areas.push(byte_index);
title_areas.push(byte_index + length);
}
title_areas.push(text.len());
title_areas.sort_unstable();
title_areas
}
/// note: matches must have been sorted by `char_index` and `char_length` before being passed.
///
/// ```no_run
/// matches.sort_unstable_by_key(|m| (m.char_index, m.char_length));
///
/// let matches = matches.matches.iter().filter(|m| SchemaAttr::new(m.attribute) == attr).cloned();
///
/// let (text, matches) = crop_text(&text, matches, 35);
/// ```
fn crop_text(
text: &str,
highlights: impl IntoIterator<Item=Highlight>,
context: usize,
) -> (String, Vec<Highlight>)
{
let mut highlights = highlights.into_iter().peekable();
let char_index = highlights.peek().map(|m| m.char_index as usize).unwrap_or(0);
let start = char_index.saturating_sub(context);
let text = text.chars().skip(start).take(context * 2).collect();
let highlights = highlights
.take_while(|m| {
(m.char_index as usize) + (m.char_length as usize) <= start + (context * 2)
})
.map(|highlight| {
Highlight { char_index: highlight.char_index - start as u16, ..highlight }
})
.collect();
(text, highlights)
}
fn search_command(command: SearchCommand, database: Database) -> Result<(), Box<dyn Error>> {
let rkv = database.rkv.read().unwrap();
let index = database.open_index(INDEX_NAME)?;
let reader = rkv.read().unwrap();
let schema = index.main.schema(&reader)?;
let schema = schema.ok_or(meilidb_core::Error::SchemaMissing)?;
let fields = command.displayed_fields.iter().map(String::as_str);
let fields = HashSet::from_iter(fields);
let config = Config::builder().auto_add_history(true).build();
let mut readline = Editor::<()>::with_config(config);
let _ = readline.load_history("query-history.txt");
for result in readline.iter("Searching for: ") {
match result {
Ok(query) => {
let start_total = Instant::now();
let builder = index.query_builder();
let documents = builder.query(&reader, &query, 0..command.number_results)?;
let mut retrieve_duration = Duration::default();
let number_of_documents = documents.len();
for mut doc in documents {
doc.highlights.sort_unstable_by_key(|m| (m.char_index, m.char_length));
let start_retrieve = Instant::now();
let result = index.document::<Document, _>(&reader, Some(&fields), doc.id);
retrieve_duration += start_retrieve.elapsed();
match result {
Ok(Some(document)) => {
println!("raw-id: {:?}", doc.id);
for (name, text) in document.0 {
print!("{}: ", name);
let attr = schema.attribute(&name).unwrap();
let highlights = doc.highlights.iter()
.filter(|m| SchemaAttr::new(m.attribute) == attr)
.cloned();
let (text, highlights) = crop_text(&text, highlights, command.char_context);
let areas = create_highlight_areas(&text, &highlights);
display_highlights(&text, &areas)?;
println!();
}
},
Ok(None) => eprintln!("missing document"),
Err(e) => eprintln!("{}", e),
}
let mut matching_attributes = HashSet::new();
for highlight in doc.highlights {
let attr = SchemaAttr::new(highlight.attribute);
let name = schema.attribute_name(attr);
matching_attributes.insert(name);
}
let matching_attributes = Vec::from_iter(matching_attributes);
println!("matching in: {:?}", matching_attributes);
println!();
}
eprintln!("document field retrieve took {:.2?}", retrieve_duration);
eprintln!("===== Found {} results in {:.2?} =====", number_of_documents, start_total.elapsed());
},
Err(err) => {
println!("Error: {:?}", err);
break
}
}
}
readline.save_history("query-history.txt").unwrap();
Ok(())
}
fn main() -> Result<(), Box<dyn Error>> {
env_logger::init();
let opt = Command::from_args();
let database = Database::open_or_create(opt.path())?;
match opt {
Command::Index(command) => index_command(command, database),
Command::Search(command) => search_command(command, database),
}
}