596 lines
17 KiB
Rust
596 lines
17 KiB
Rust
use std::{
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collections::{BTreeSet, HashMap},
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fmt,
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net::IpAddr,
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ops::Deref,
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str::FromStr,
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time::Instant,
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};
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use futures::future::join_all;
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use once_cell::sync::Lazy;
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use reqwest::header::HeaderMap;
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use tokio::sync::mpsc;
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mod macros;
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use crate::{
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engine_autocomplete_requests, engine_postsearch_requests, engine_requests, engine_weights,
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engines,
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};
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pub mod answer;
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pub mod postsearch;
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pub mod search;
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engines! {
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// search
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Google = "google",
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Bing = "bing",
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Brave = "brave",
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Marginalia = "marginalia",
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// answer
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Useragent = "useragent",
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Ip = "ip",
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Calc = "calc",
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Wikipedia = "wikipedia",
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Dictionary = "dictionary",
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Timezone = "timezone",
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// post-search
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StackExchange = "stackexchange",
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GitHub = "github",
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DocsRs = "docs.rs",
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}
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engine_weights! {
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Google = 1.05,
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Bing = 1.0,
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Brave = 1.25,
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Marginalia = 0.15,
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// defaults to 1.0
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}
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engine_requests! {
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// search
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Google => search::google::request, parse_response,
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Bing => search::bing::request, parse_response,
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Brave => search::brave::request, parse_response,
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Marginalia => search::marginalia::request, parse_response,
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// answer
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Useragent => answer::useragent::request, None,
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Ip => answer::ip::request, None,
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Calc => answer::calc::request, None,
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Wikipedia => answer::wikipedia::request, parse_response,
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Dictionary => answer::dictionary::request, parse_response,
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Timezone => answer::timezone::request, None,
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}
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engine_autocomplete_requests! {
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Google => search::google::request_autocomplete, parse_autocomplete_response,
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Calc => answer::calc::request_autocomplete, None,
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}
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engine_postsearch_requests! {
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StackExchange => postsearch::stackexchange::request, parse_response,
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GitHub => postsearch::github::request, parse_response,
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DocsRs => postsearch::docs_rs::request, parse_response,
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}
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impl fmt::Display for Engine {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{}", self.id())
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}
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}
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pub struct SearchQuery {
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pub query: String,
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pub request_headers: HashMap<String, String>,
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pub ip: String,
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}
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impl Deref for SearchQuery {
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type Target = str;
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fn deref(&self) -> &Self::Target {
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&self.query
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}
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}
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pub enum RequestResponse {
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None,
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Http(reqwest::RequestBuilder),
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Instant(EngineResponse),
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}
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impl From<reqwest::RequestBuilder> for RequestResponse {
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fn from(req: reqwest::RequestBuilder) -> Self {
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Self::Http(req)
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}
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}
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impl From<EngineResponse> for RequestResponse {
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fn from(res: EngineResponse) -> Self {
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Self::Instant(res)
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}
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}
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pub enum RequestAutocompleteResponse {
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Http(reqwest::RequestBuilder),
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Instant(Vec<String>),
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}
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impl From<reqwest::RequestBuilder> for RequestAutocompleteResponse {
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fn from(req: reqwest::RequestBuilder) -> Self {
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Self::Http(req)
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}
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}
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impl From<Vec<String>> for RequestAutocompleteResponse {
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fn from(res: Vec<String>) -> Self {
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Self::Instant(res)
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}
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}
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pub struct HttpResponse {
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pub res: reqwest::Response,
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pub body: String,
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}
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impl<'a> From<&'a HttpResponse> for &'a str {
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fn from(res: &'a HttpResponse) -> Self {
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&res.body
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}
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}
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impl From<HttpResponse> for reqwest::Response {
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fn from(res: HttpResponse) -> Self {
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res.res
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}
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}
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#[derive(Debug)]
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pub struct EngineSearchResult {
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pub url: String,
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pub title: String,
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pub description: String,
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}
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#[derive(Debug)]
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pub struct EngineFeaturedSnippet {
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pub url: String,
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pub title: String,
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pub description: String,
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}
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#[derive(Debug, Default)]
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pub struct EngineResponse {
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pub search_results: Vec<EngineSearchResult>,
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pub featured_snippet: Option<EngineFeaturedSnippet>,
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pub answer_html: Option<String>,
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pub infobox_html: Option<String>,
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}
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impl EngineResponse {
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#[must_use]
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pub fn new() -> Self {
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Self::default()
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}
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#[must_use]
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pub fn answer_html(html: String) -> Self {
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Self {
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answer_html: Some(html),
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..Default::default()
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}
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}
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#[must_use]
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pub fn infobox_html(html: String) -> Self {
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Self {
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infobox_html: Some(html),
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..Default::default()
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}
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}
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}
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#[derive(Debug)]
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pub enum EngineProgressUpdate {
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Requesting,
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Downloading,
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Parsing,
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Done,
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}
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#[derive(Debug)]
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pub enum ProgressUpdateData {
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Engine {
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engine: Engine,
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update: EngineProgressUpdate,
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},
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Response(Response),
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PostSearchInfobox(Infobox),
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}
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#[derive(Debug)]
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pub struct ProgressUpdate {
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pub data: ProgressUpdateData,
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pub time_ms: u64,
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}
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impl ProgressUpdate {
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#[must_use]
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pub fn new(data: ProgressUpdateData, start_time: Instant) -> Self {
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Self {
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data,
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time_ms: start_time.elapsed().as_millis() as u64,
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}
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}
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}
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pub async fn search_with_engines(
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engines: &[Engine],
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query: &SearchQuery,
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progress_tx: mpsc::UnboundedSender<ProgressUpdate>,
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) -> eyre::Result<()> {
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let start_time = Instant::now();
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let mut requests = Vec::new();
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for engine in engines {
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requests.push(async {
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let engine = *engine;
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let request_response = engine.request(query);
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let response = match request_response {
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RequestResponse::Http(request) => {
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::Engine {
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engine,
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update: EngineProgressUpdate::Requesting,
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},
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start_time,
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))?;
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let mut res = request.send().await?;
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::Engine {
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engine,
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update: EngineProgressUpdate::Downloading,
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},
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start_time,
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))?;
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let mut body_bytes = Vec::new();
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while let Some(chunk) = res.chunk().await? {
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body_bytes.extend_from_slice(&chunk);
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}
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let body = String::from_utf8_lossy(&body_bytes).to_string();
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::Engine {
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engine,
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update: EngineProgressUpdate::Parsing,
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},
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start_time,
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))?;
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let http_response = HttpResponse { res, body };
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let response = match engine.parse_response(&http_response) {
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Ok(response) => response,
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Err(e) => {
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eprintln!("parse error: {e}");
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EngineResponse::new()
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}
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};
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::Engine {
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engine,
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update: EngineProgressUpdate::Done,
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},
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start_time,
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))?;
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response
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}
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RequestResponse::Instant(response) => response,
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RequestResponse::None => EngineResponse::new(),
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};
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Ok((engine, response))
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});
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}
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let mut response_futures = Vec::new();
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for request in requests {
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response_futures.push(request);
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}
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let responses_result: eyre::Result<HashMap<_, _>> =
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join_all(response_futures).await.into_iter().collect();
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let responses = responses_result?;
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let response = merge_engine_responses(responses);
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let has_infobox = response.infobox.is_some();
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::Response(response.clone()),
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start_time,
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))?;
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if !has_infobox {
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// post-search
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let mut postsearch_requests = Vec::new();
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for engine in engines {
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if let Some(request) = engine.postsearch_request(&response) {
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postsearch_requests.push(async {
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let response = match request.send().await {
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Ok(mut res) => {
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let mut body_bytes = Vec::new();
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while let Some(chunk) = res.chunk().await? {
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body_bytes.extend_from_slice(&chunk);
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}
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let body = String::from_utf8_lossy(&body_bytes).to_string();
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let http_response = HttpResponse { res, body };
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engine.postsearch_parse_response(&http_response)
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}
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Err(e) => {
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eprintln!("postsearch request error: {e}");
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None
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}
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};
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Ok((*engine, response))
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});
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}
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}
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let mut postsearch_response_futures = Vec::new();
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for request in postsearch_requests {
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postsearch_response_futures.push(request);
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}
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let postsearch_responses_result: eyre::Result<HashMap<_, _>> =
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join_all(postsearch_response_futures)
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.await
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.into_iter()
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.collect();
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let postsearch_responses = postsearch_responses_result?;
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for (engine, response) in postsearch_responses {
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if let Some(html) = response {
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progress_tx.send(ProgressUpdate::new(
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ProgressUpdateData::PostSearchInfobox(Infobox { html, engine }),
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start_time,
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))?;
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// break so we don't send multiple infoboxes
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break;
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}
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}
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}
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Ok(())
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}
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pub async fn autocomplete_with_engines(
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engines: &[Engine],
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query: &str,
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) -> eyre::Result<Vec<String>> {
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let mut requests = Vec::new();
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for engine in engines {
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if let Some(request) = engine.request_autocomplete(query) {
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requests.push(async {
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let response = match request {
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RequestAutocompleteResponse::Http(request) => {
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let res = request.send().await?;
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let body = res.text().await?;
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engine.parse_autocomplete_response(&body)?
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}
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RequestAutocompleteResponse::Instant(response) => response,
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};
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Ok((*engine, response))
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});
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}
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}
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let mut autocomplete_futures = Vec::new();
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for request in requests {
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autocomplete_futures.push(request);
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}
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let autocomplete_results_result: eyre::Result<HashMap<_, _>> =
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join_all(autocomplete_futures).await.into_iter().collect();
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let autocomplete_results = autocomplete_results_result?;
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Ok(merge_autocomplete_responses(autocomplete_results))
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}
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pub static CLIENT: Lazy<reqwest::Client> = Lazy::new(|| {
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reqwest::ClientBuilder::new()
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.local_address(IpAddr::from_str("0.0.0.0").unwrap())
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// we pretend to be a normal browser so websites don't block us
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// (since we're not entirely a bot, we're acting on behalf of the user)
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.user_agent("Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0")
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.default_headers({
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let mut headers = HeaderMap::new();
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headers.insert("Accept-Language", "en-US,en;q=0.5".parse().unwrap());
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headers
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})
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.build()
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.unwrap()
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});
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pub async fn search(
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query: SearchQuery,
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progress_tx: mpsc::UnboundedSender<ProgressUpdate>,
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) -> eyre::Result<()> {
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let engines = Engine::all();
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search_with_engines(engines, &query, progress_tx).await
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}
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pub async fn autocomplete(query: &str) -> eyre::Result<Vec<String>> {
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let engines = Engine::all();
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autocomplete_with_engines(engines, query).await
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}
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#[derive(Debug, Clone)]
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pub struct Response {
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pub search_results: Vec<SearchResult>,
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pub featured_snippet: Option<FeaturedSnippet>,
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pub answer: Option<Answer>,
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pub infobox: Option<Infobox>,
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}
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#[derive(Debug, Clone)]
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pub struct SearchResult {
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pub url: String,
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pub title: String,
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pub description: String,
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pub engines: BTreeSet<Engine>,
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pub score: f64,
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}
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#[derive(Debug, Clone)]
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pub struct FeaturedSnippet {
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pub url: String,
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pub title: String,
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pub description: String,
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pub engine: Engine,
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}
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#[derive(Debug, Clone)]
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pub struct Answer {
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pub html: String,
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pub engine: Engine,
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}
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#[derive(Debug, Clone)]
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pub struct Infobox {
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pub html: String,
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pub engine: Engine,
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}
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fn merge_engine_responses(responses: HashMap<Engine, EngineResponse>) -> Response {
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let mut search_results: Vec<SearchResult> = Vec::new();
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let mut featured_snippet: Option<FeaturedSnippet> = None;
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let mut answer: Option<Answer> = None;
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let mut infobox: Option<Infobox> = None;
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for (engine, response) in responses {
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for (result_index, search_result) in response.search_results.into_iter().enumerate() {
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// position 1 has a score of 1, position 2 has a score of 0.5, position 3 has a
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// score of 0.33, etc.
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let base_result_score = 1. / (result_index + 1) as f64;
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let result_score = base_result_score * engine.weight();
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if let Some(existing_result) = search_results
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.iter_mut()
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.find(|r| r.url == search_result.url)
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{
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// if the weight of this engine is higher than every other one then replace the
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// title and description
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if engine.weight()
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> existing_result
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.engines
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.iter()
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.map(Engine::weight)
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.max_by(|a, b| a.partial_cmp(b).unwrap())
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.unwrap_or(0.)
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{
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existing_result.title = search_result.title;
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existing_result.description = search_result.description;
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}
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existing_result.engines.insert(engine);
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existing_result.score += result_score;
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} else {
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search_results.push(SearchResult {
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url: search_result.url,
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title: search_result.title,
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description: search_result.description,
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engines: [engine].iter().copied().collect(),
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score: result_score,
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});
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}
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}
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if let Some(engine_featured_snippet) = response.featured_snippet {
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// if it has a higher weight than the current featured snippet
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let featured_snippet_weight =
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featured_snippet.as_ref().map_or(0., |s| s.engine.weight());
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if engine.weight() > featured_snippet_weight {
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featured_snippet = Some(FeaturedSnippet {
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url: engine_featured_snippet.url,
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title: engine_featured_snippet.title,
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description: engine_featured_snippet.description,
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engine,
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});
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}
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}
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if let Some(engine_answer_html) = response.answer_html {
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// if it has a higher weight than the current answer
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let answer_weight = answer.as_ref().map_or(0., |s| s.engine.weight());
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if engine.weight() > answer_weight {
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answer = Some(Answer {
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html: engine_answer_html,
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engine,
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});
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}
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}
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if let Some(engine_infobox_html) = response.infobox_html {
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// if it has a higher weight than the current infobox
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let infobox_weight = infobox.as_ref().map_or(0., |s| s.engine.weight());
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if engine.weight() > infobox_weight {
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infobox = Some(Infobox {
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html: engine_infobox_html,
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engine,
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});
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}
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}
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}
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search_results.sort_by(|a, b| b.score.partial_cmp(&a.score).unwrap());
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Response {
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search_results,
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featured_snippet,
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answer,
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infobox,
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}
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}
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|
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pub struct AutocompleteResult {
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pub query: String,
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pub score: f64,
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}
|
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fn merge_autocomplete_responses(responses: HashMap<Engine, Vec<String>>) -> Vec<String> {
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let mut autocomplete_results: Vec<AutocompleteResult> = Vec::new();
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for (engine, response) in responses {
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for (result_index, autocomplete_result) in response.into_iter().enumerate() {
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// position 1 has a score of 1, position 2 has a score of 0.5, position 3 has a
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// score of 0.33, etc.
|
|
let base_result_score = 1. / (result_index + 1) as f64;
|
|
let result_score = base_result_score * engine.weight();
|
|
|
|
if let Some(existing_result) = autocomplete_results
|
|
.iter_mut()
|
|
.find(|r| r.query == autocomplete_result)
|
|
{
|
|
existing_result.score += result_score;
|
|
} else {
|
|
autocomplete_results.push(AutocompleteResult {
|
|
query: autocomplete_result,
|
|
score: result_score,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
autocomplete_results.sort_by(|a, b| b.score.partial_cmp(&a.score).unwrap());
|
|
|
|
autocomplete_results.into_iter().map(|r| r.query).collect()
|
|
}
|