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Merge pull request #273 from gzsombor/search-result-parse-refactor

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⚙️ Rewrite the search result parser code to make the engine code more concise
This commit is contained in:
alamin655 2023-10-13 09:44:52 +05:30 committed by GitHub
commit 40b7e6d2ea
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8 changed files with 167 additions and 112 deletions
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7
src/config/parser.rs
View File

@ -3,6 +3,7 @@
use crate::handler::paths::{file_path, FileType};
use crate::models::engine_models::{EngineError, EngineHandler};
use crate::models::parser_models::{AggregatorConfig, RateLimiter, Style};
use log::LevelFilter;
use mlua::Lua;
@ -28,7 +29,7 @@ pub struct Config {
/// It stores the option to whether enable or disable debug mode.
pub debug: bool,
/// It stores all the engine names that were enabled by the user.
pub upstream_search_engines: Vec<crate::models::engine_models::EngineHandler>,
pub upstream_search_engines: Vec<EngineHandler>,
/// It stores the time (secs) which controls the server request timeout.
pub request_timeout: u8,
/// It stores the number of threads which controls the app will use to run.
@ -111,8 +112,8 @@ impl Config {
.get::<_, HashMap<String, bool>>("upstream_search_engines")?
.into_iter()
.filter_map(|(key, value)| value.then_some(key))
.filter_map(|engine| crate::models::engine_models::EngineHandler::new(&engine))
.collect(),
.map(|engine| EngineHandler::new(&engine))
.collect::<Result<Vec<EngineHandler>, error_stack::Report<EngineError>>>()?,
request_timeout: globals.get::<_, u8>("request_timeout")?,
threads,
rate_limiter: RateLimiter {

79
src/engines/duckduckgo.rs
View File

@ -5,7 +5,7 @@
use std::collections::HashMap;
use reqwest::header::HeaderMap;
use scraper::{Html, Selector};
use scraper::Html;
use crate::models::aggregation_models::SearchResult;
@ -13,9 +13,29 @@ use crate::models::engine_models::{EngineError, SearchEngine};
use error_stack::{Report, Result, ResultExt};
use super::search_result_parser::SearchResultParser;
/// A new DuckDuckGo engine type defined in-order to implement the `SearchEngine` trait which allows to
/// reduce code duplication as well as allows to create vector of different search engines easily.
pub struct DuckDuckGo;
pub struct DuckDuckGo {
/// The parser, used to interpret the search result.
parser: SearchResultParser,
}
impl DuckDuckGo {
/// Creates the DuckDuckGo parser.
pub fn new() -> Result<Self, EngineError> {
Ok(Self {
parser: SearchResultParser::new(
".no-results",
".result",
".result__a",
".result__url",
".result__snippet",
)?,
})
}
}
#[async_trait::async_trait]
impl SearchEngine for DuckDuckGo {
@ -59,58 +79,19 @@ impl SearchEngine for DuckDuckGo {
&DuckDuckGo::fetch_html_from_upstream(self, &url, header_map, request_timeout).await?,
);
let no_result: Selector = Selector::parse(".no-results")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".no-results"))?;
if document.select(&no_result).next().is_some() {
if self.parser.parse_for_no_results(&document).next().is_some() {
return Err(Report::new(EngineError::EmptyResultSet));
}
let results: Selector = Selector::parse(".result")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".result"))?;
let result_title: Selector = Selector::parse(".result__a")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".result__a"))?;
let result_url: Selector = Selector::parse(".result__url")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".result__url"))?;
let result_desc: Selector = Selector::parse(".result__snippet")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".result__snippet"))?;
// scrape all the results from the html
Ok(document
.select(&results)
.map(|result| {
SearchResult::new(
result
.select(&result_title)
.next()
.unwrap()
.inner_html()
.trim(),
format!(
"https://{}",
result
.select(&result_url)
.next()
.unwrap()
.inner_html()
.trim()
)
.as_str(),
result
.select(&result_desc)
.next()
.unwrap()
.inner_html()
.trim(),
self.parser
.parse_for_results(&document, |title, url, desc| {
Some(SearchResult::new(
title.inner_html().trim(),
&format!("https://{}", url.inner_html().trim()),
desc.inner_html().trim(),
&["duckduckgo"],
)
))
})
.map(|search_result| (search_result.url.clone(), search_result))
.collect())
}
}

1
src/engines/mod.rs
View File

@ -4,4 +4,5 @@
//! code. Moreover, it also provides a custom error for the upstream search engine handling code.
pub mod duckduckgo;
pub mod search_result_parser;
pub mod searx;

76
src/engines/search_result_parser.rs Normal file
View File

@ -0,0 +1,76 @@
//! This modules provides helper functionalities for parsing a html document into internal SearchResult.
use std::collections::HashMap;
use crate::models::{aggregation_models::SearchResult, engine_models::EngineError};
use error_stack::{Report, Result};
use scraper::{html::Select, ElementRef, Html, Selector};
/// A html search result parser, based on a predefined CSS selectors.
pub struct SearchResultParser {
/// selector to locate the element which is displayed, if there were nothing found.
no_result: Selector,
/// selector to locate the element which contains one item from the search result.
results: Selector,
/// selector to locate the title relative to the search result item.
result_title: Selector,
/// selector to locate the url relative to the search result item.
result_url: Selector,
/// selector to locate the description relative to the search result item.
result_desc: Selector,
}
impl SearchResultParser {
/// Creates a new parser, if all the selectors are valid, otherwise it returns an EngineError
pub fn new(
no_result_selector: &str,
results_selector: &str,
result_title_selector: &str,
result_url_selector: &str,
result_desc_selector: &str,
) -> Result<SearchResultParser, EngineError> {
Ok(SearchResultParser {
no_result: new_selector(no_result_selector)?,
results: new_selector(results_selector)?,
result_title: new_selector(result_title_selector)?,
result_url: new_selector(result_url_selector)?,
result_desc: new_selector(result_desc_selector)?,
})
}
/// Parse the html and returns element representing the 'no result found' response.
pub fn parse_for_no_results<'a>(&'a self, document: &'a Html) -> Select<'a, 'a> {
document.select(&self.no_result)
}
/// Parse the html, and convert the results to SearchResult with the help of the builder function
pub fn parse_for_results(
&self,
document: &Html,
builder: impl Fn(&ElementRef<'_>, &ElementRef<'_>, &ElementRef<'_>) -> Option<SearchResult>,
) -> Result<HashMap<String, SearchResult>, EngineError> {
let res = document
.select(&self.results)
.filter_map(|result| {
let title = result.select(&self.result_title).next();
let url = result.select(&self.result_url).next();
let desc = result.select(&self.result_desc).next();
match (title, url, desc) {
(Some(ref t), Some(ref u), Some(ref d)) => builder(t, u, d),
_ => None,
}
})
.map(|search_result| (search_result.url.clone(), search_result))
.collect();
Ok(res)
}
}
/// Create a Selector struct, if the given parameter is a valid css expression, otherwise convert it into an EngineError.
fn new_selector(selector: &str) -> Result<Selector, EngineError> {
Selector::parse(selector).map_err(|err| {
Report::new(EngineError::UnexpectedError).attach_printable(format!(
"invalid CSS selector: {}, err: {:?}",
selector, err
))
})
}

82
src/engines/searx.rs
View File

@ -3,16 +3,35 @@
//! number if provided.
use reqwest::header::HeaderMap;
use scraper::{Html, Selector};
use scraper::Html;
use std::collections::HashMap;
use super::search_result_parser::SearchResultParser;
use crate::models::aggregation_models::SearchResult;
use crate::models::engine_models::{EngineError, SearchEngine};
use error_stack::{Report, Result, ResultExt};
/// A new Searx engine type defined in-order to implement the `SearchEngine` trait which allows to
/// reduce code duplication as well as allows to create vector of different search engines easily.
pub struct Searx;
pub struct Searx {
/// The parser, used to interpret the search result.
parser: SearchResultParser,
}
impl Searx {
/// creates a Searx parser
pub fn new() -> Result<Searx, EngineError> {
Ok(Self {
parser: SearchResultParser::new(
"#urls>.dialog-error>p",
".result",
"h3>a",
"h3>a",
".content",
)?,
})
}
}
#[async_trait::async_trait]
impl SearchEngine for Searx {
@ -52,13 +71,7 @@ impl SearchEngine for Searx {
&Searx::fetch_html_from_upstream(self, &url, header_map, request_timeout).await?,
);
let no_result: Selector = Selector::parse("#urls>.dialog-error>p")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| {
format!("invalid CSS selector: {}", "#urls>.dialog-error>p")
})?;
if let Some(no_result_msg) = document.select(&no_result).nth(1) {
if let Some(no_result_msg) = self.parser.parse_for_no_results(&document).nth(1) {
if no_result_msg.inner_html()
== "we didn't find any results. Please use another query or search in more categories"
{
@ -66,48 +79,17 @@ impl SearchEngine for Searx {
}
}
let results: Selector = Selector::parse(".result")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".result"))?;
let result_title: Selector = Selector::parse("h3>a")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", "h3>a"))?;
let result_url: Selector = Selector::parse("h3>a")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", "h3>a"))?;
let result_desc: Selector = Selector::parse(".content")
.map_err(|_| Report::new(EngineError::UnexpectedError))
.attach_printable_lazy(|| format!("invalid CSS selector: {}", ".content"))?;
// scrape all the results from the html
Ok(document
.select(&results)
.map(|result| {
SearchResult::new(
result
.select(&result_title)
.next()
.unwrap()
.inner_html()
.trim(),
result
.select(&result_url)
.next()
.unwrap()
.value()
.attr("href")
.unwrap(),
result
.select(&result_desc)
.next()
.unwrap()
.inner_html()
.trim(),
&["searx"],
)
self.parser
.parse_for_results(&document, |title, url, desc| {
url.value().attr("href").map(|url| {
SearchResult::new(
title.inner_html().trim(),
url,
desc.inner_html().trim(),
&["searx"],
)
})
})
.map(|search_result| (search_result.url.clone(), search_result))
.collect())
}
}

2
src/models/aggregation_models.rs
View File

@ -85,12 +85,14 @@ impl EngineErrorInfo {
pub fn new(error: &EngineError, engine: &str) -> Self {
Self {
error: match error {
EngineError::NoSuchEngineFound(_) => "EngineNotFound".to_owned(),
EngineError::RequestError => "RequestError".to_owned(),
EngineError::EmptyResultSet => "EmptyResultSet".to_owned(),
EngineError::UnexpectedError => "UnexpectedError".to_owned(),
},
engine: engine.to_owned(),
severity_color: match error {
EngineError::NoSuchEngineFound(_) => "red".to_owned(),
EngineError::RequestError => "green".to_owned(),
EngineError::EmptyResultSet => "blue".to_owned(),
EngineError::UnexpectedError => "red".to_owned(),

30
src/models/engine_models.rs
View File

@ -2,12 +2,14 @@
//! the upstream search engines with the search query provided by the user.
use super::aggregation_models::SearchResult;
use error_stack::{Result, ResultExt};
use error_stack::{Report, Result, ResultExt};
use std::{collections::HashMap, fmt, time::Duration};
/// A custom error type used for handle engine associated errors.
#[derive(Debug)]
pub enum EngineError {
/// No matching engine found
NoSuchEngineFound(String),
/// This variant handles all request related errors like forbidden, not found,
/// etc.
EmptyResultSet,
@ -24,6 +26,9 @@ pub enum EngineError {
impl fmt::Display for EngineError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
EngineError::NoSuchEngineFound(engine) => {
write!(f, "No such engine with the name '{engine}' found")
}
EngineError::EmptyResultSet => {
write!(f, "The upstream search engine returned an empty result set")
}
@ -134,18 +139,25 @@ impl EngineHandler {
/// # Returns
///
/// It returns an option either containing the value or a none if the engine is unknown
pub fn new(engine_name: &str) -> Option<Self> {
pub fn new(engine_name: &str) -> Result<Self, EngineError> {
let engine: (&'static str, Box<dyn SearchEngine>) =
match engine_name.to_lowercase().as_str() {
"duckduckgo" => (
"duckduckgo",
Box::new(crate::engines::duckduckgo::DuckDuckGo),
),
"searx" => ("searx", Box::new(crate::engines::searx::Searx)),
_ => return None,
"duckduckgo" => {
let engine = crate::engines::duckduckgo::DuckDuckGo::new()?;
("duckduckgo", Box::new(engine))
}
"searx" => {
let engine = crate::engines::searx::Searx::new()?;
("searx", Box::new(engine))
}
_ => {
return Err(Report::from(EngineError::NoSuchEngineFound(
engine_name.to_string(),
)))
}
};
Some(Self {
Ok(Self {
engine: engine.1,
name: engine.0,
})

2
src/server/routes/search.rs
View File

@ -191,7 +191,7 @@ async fn results(
let engines: Vec<EngineHandler> = cookie_value
.engines
.iter()
.filter_map(|name| EngineHandler::new(name))
.filter_map(|name| EngineHandler::new(name).ok())
.collect();
safe_search_level = match config.safe_search {