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use std::collections::HashMap;
use reqwest::header::USER_AGENT;
use scraper::{Html, Selector};
use crate::search_results_handler::aggregation_models::RawSearchResult;
// This function scrapes results from the upstream engine searx instance and puts all the scraped
// results like title, visiting_url (href in html),engine (from which engine it was fetched from)
// and description in a RawSearchResult and then adds that to HashMap whose keys are url and
// values are RawSearchResult struct and then returns it within a Result enum.
pub async fn results(
query: &str,
page: Option<u32>,
user_agent: &str,
) -> Result<HashMap<String, RawSearchResult>, Box<dyn std::error::Error>> {
// Page number can be missing or empty string and so appropriate handling is required
// so that upstream server recieves valid page number.
let url: String = match page {
Some(page_number) => {
if page_number <= 1 {
format!("https://searx.work/search?q={query}")
} else {
format!("https://searx.work/search?q={query}&pageno={page_number}",)
}
}
None => format!("https://searx.work/search?q={query}"),
};
// fetch the html from upstream searx instance engine
// TODO: Write better error handling code to handle no results case.
let results: String = reqwest::Client::new()
.get(url)
.header(USER_AGENT, user_agent)
.send()
.await?
.text()
.await?;
let document: Html = Html::parse_document(&results);
let results: Selector = Selector::parse(".result")?;
let result_title: Selector = Selector::parse("h3>a")?;
let result_url: Selector = Selector::parse("h3>a")?;
let result_desc: Selector = Selector::parse(".content")?;
let mut search_results: HashMap<String, RawSearchResult> = HashMap::new();
// scrape all the results from the html
for result in document.select(&results) {
let search_result: RawSearchResult = RawSearchResult {
title: result
.select(&result_title)
.next()
.unwrap()
.inner_html()
.trim()
.to_string(),
visiting_url: result
.select(&result_url)
.next()
.unwrap()
.value()
.attr("href")
.unwrap()
.to_string(),
description: result
.select(&result_desc)
.next()
.unwrap()
.inner_html()
.trim()
.to_string(),
engine: vec!["searx".to_string()],
};
search_results.insert(
result
.select(&result_url)
.next()
.unwrap()
.value()
.attr("href")
.unwrap()
.to_string(),
search_result,
);
}
Ok(search_results)
}
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