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mod indexer_implementation;
use actix_cors::Cors;
use actix_web::{get, post, routes, web, App, HttpServer, Responder};
use indexer_implementation::IndexerImplementation;
use kuchiki::traits::TendrilSink;
use lib::lib::*;
use std::collections::HashSet;
use std::sync::Mutex;
pub trait Indexer {
//too many args?
fn insert(
&mut self,
words: &[String],
url: &str,
title: &Option<String>,
description: &Option<String>,
language: &Option<String>,
content: &str,
) -> Result<(), String>;
fn search(&self, term: &str) -> Result<HashSet<IndexedResource>, String>;
fn num_of_words(&self) -> usize;
}
struct AppState {
indexer: Mutex<Box<dyn Indexer + Send + Sync>>,
}
#[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 {
indexer: Mutex::new(Box::new(IndexerImplementation::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)
#[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());
let kuchiki_parser = kuchiki::parse_html().one(resource.content.as_str());
//remove script, style and noscript tags
kuchiki_parser
.inclusive_descendants()
.filter(|node| {
node.as_element().map_or(false, |e| {
matches!(e.name.local.as_ref(), "script" | "style" | "noscript")
})
})
.collect::<Vec<_>>()
.iter()
.for_each(|node| node.detach());
let text = kuchiki_parser.text_contents();
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
.map(|w| w.to_ascii_lowercase().split_whitespace().collect())
.filter(|w: &String| !w.is_empty())
.collect();
println!("xd: {:?}", fixed_words);
let title_selector = scraper::Selector::parse("title").unwrap();
let meta_selector = scraper::Selector::parse("meta").unwrap();
let html_selector = scraper::Selector::parse("html").unwrap();
let page_title: Option<String> = match document
.select(&title_selector)
.map(|e| e.inner_html())
.take(1)
.collect::<String>()
{
s if s.is_empty() => None,
string => Some(string),
};
let page_description: Option<String> = match document
.select(&meta_selector)
.filter(|e| e.value().attr("name") == Some("description"))
.filter_map(|e| e.value().attr("content"))
.take(1)
.collect::<String>()
{
s if s.is_empty() => None,
string => Some(string),
};
//TODO: rewrite with if let else
let page_language: Option<String> = match document
.select(&html_selector)
.filter_map(|e| e.value().attr("lang"))
.take(1)
.collect::<String>()
{
s if s.is_empty() => None,
string => Some(string),
};
//and for each changed content word we add it to the db (word -> list.append(url))
let mut indexer = data.indexer.lock().unwrap();
let _ = indexer.insert(
&fixed_words,
&resource.url,
&page_title,
&page_description,
&page_language,
&resource.content,
);
//TODO: ADD LANG? EN in meta tag (frontend)
//Now what to do, global lang?, per index lang?, website lang?
//TODO: max number of results in query
println!("Added resource: {:?}", indexer.num_of_words());
format!("{resource:?}")
}
#[routes]
#[get("/search")]
#[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 indexer = data.indexer.lock().unwrap();
let results = indexer.search(&term);
//+is lowercase search good (we turn ascii lowercase, what do we do with inserting)
serde_json::to_string(&results.unwrap()).unwrap()
}
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