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use actix_cors::Cors;
use actix_web::{get, post, web, App, HttpServer, Responder};
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::hash::{Hash, Hasher};
use std::sync::{Arc, Mutex};
#[derive(Debug, Clone, Serialize)]
struct IndexedResource {
url: String,
title: String,
description: String,
priority: u32,
word: Arc<String>,
}
//We implement PartialEq, Eq and Hash to ignore the priority field.
impl PartialEq for IndexedResource {
fn eq(&self, other: &Self) -> bool {
self.url == other.url && self.word == other.word
}
}
impl Eq for IndexedResource {}
impl Hash for IndexedResource {
fn hash<H: Hasher>(&self, state: &mut H) {
self.url.hash(state);
self.word.hash(state);
}
}
struct AppState {
database: Mutex<HashMap<String, HashSet<IndexedResource>>>,
}
#[actix_web::main]
async fn main() -> std::io::Result<()> {
println!("Hello, world! Im the indexer!");
serve_http_endpoint("0.0.0.0", 4444).await
}
async fn serve_http_endpoint(address: &str, port: u16) -> std::io::Result<()> {
let shared_state = web::Data::new(AppState {
database: Mutex::new(HashMap::new()),
});
HttpServer::new(move || {
let cors = Cors::permissive();
App::new()
.wrap(cors)
.app_data(shared_state.clone())
.service(no_search)
.service(search)
.service(add_resource)
})
.bind((address, port))?
.run()
.await
}
//TODO: sufficiently simmilar word in search (algorithm)
//we need to rename stuff
#[derive(Deserialize, Debug)]
struct CrawledResource {
url: String,
content: String,
}
#[post("/resource")]
async fn add_resource(
data: web::Data<AppState>,
resource: web::Json<CrawledResource>,
) -> impl Responder {
//parse content
let document = scraper::Html::parse_document(resource.content.as_str());
//TODO: Not very good, can we just body.get_text()?
let text = html2text::from_read(resource.content.as_str().as_bytes(), resource.content.len());
let split_words = text.split(' ');
//fixup words (remove words with non alphabetic chars, empty words, transform to lowercase...)
let fixed_words: Vec<String> = split_words
.filter(|w| !w.chars().any(|c| !c.is_ascii_alphabetic()))
.filter(|w| !w.is_empty() && *w != " ")
.map(|w| w.to_ascii_lowercase())
.collect();
println!("xd: {:?}", fixed_words);
let title_selector = scraper::Selector::parse("title").unwrap();
let description_selector = scraper::Selector::parse("meta").unwrap();
let page_title: String = document
.select(&title_selector)
.map(|e| e.inner_html())
.take(1)
.collect();
let page_description: String = document
.select(&description_selector)
.filter(|e| e.value().attr("name") == Some("description"))
.filter_map(|e| e.value().attr("content"))
.take(1)
.collect();
//and for each changed content word we add it to the db (word -> list.append(url))
let mut database = data.database.lock().unwrap();
for word in &fixed_words {
let resource_to_add = IndexedResource {
url: resource.url.clone(),
priority: calculate_word_priority(word, resource.content.as_str(), &fixed_words),
word: Arc::new(word.clone()),
title: page_title.clone(),
description: page_description.clone(),
};
match database.get_mut(word) {
Some(resources) => _ = resources.insert(resource_to_add),
None => _ = database.insert(word.clone(), HashSet::from([resource_to_add])),
}
}
println!("Added resource! {:?}", database.len());
format!("{:?}", resource)
}
#[get("/search")]
async fn no_search(_data: web::Data<AppState>) -> impl Responder {
"[]".to_string()
}
#[get("/search/{term}")]
async fn search(data: web::Data<AppState>, term: web::Path<String>) -> impl Responder {
let query: Vec<&str> = term.split(' ').collect();
let database = data.database.lock().unwrap();
//percentage of valid words
let mut valid_results: Option<HashSet<IndexedResource>> = None;
for w in query {
let curr_word_results = match search_word_in_db(&database, w.to_string()) {
None => return "[]".to_string(),
Some(curr_results) => curr_results,
};
match valid_results {
//Initialise valid_results
None => {
valid_results = Some(curr_word_results.to_owned());
}
Some(results) => {
let intersection: HashSet<IndexedResource> = curr_word_results
.intersection(&results)
.map(|s| s.to_owned())
.collect();
valid_results = Some(intersection);
}
}
}
serde_json::to_string(&valid_results.unwrap()).unwrap()
}
fn search_word_in_db(
db: &HashMap<String, HashSet<IndexedResource>>,
word: String,
) -> Option<&HashSet<IndexedResource>> {
db.get(&word)
}
fn calculate_word_priority(word: &str, _html_site: &str, words: &[String]) -> u32 {
//TODO: priorize lower levels of url, priorize word in url/title/description or main?
//atm priority is just the number of occurences in the site.
words.iter().filter(|w| *w == word).count() as u32
}
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