Merge b7d0ef7252 into 193b4e36db

⚡ Several optimizations to improve search engine performance

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "websurfx"
-version = "1.17.20"
+version = "1.17.22"
 edition = "2021"
 description = "An open-source alternative to Searx that provides clean, ad-free, and organic results with incredible speed while keeping privacy and security in mind."
 repository = "https://github.com/neon-mmd/websurfx"
@@ -27,6 +27,7 @@ tokio = { version = "1.32.0", features = [
 ], default-features = false }
 serde = { version = "1.0.209", default-features = false, features = ["derive"] }
 serde_json = { version = "1.0.122", default-features = false }
+bincode = {version="1.3.3", default-features=false}
 maud = { version = "0.26.0", default-features = false, features = [
     "actix-web",
 ] }
@@ -48,6 +49,7 @@ mlua = { version = "0.9.9", features = [
 redis = { version = "0.25.4", features = [
     "tokio-comp",
     "connection-manager",
+    "tcp_nodelay"
 ], default-features = false, optional = true }
 blake3 = { version = "1.5.4", default-features = false }
 error-stack = { version = "0.4.0", default-features = false, features = [
@@ -55,17 +57,13 @@ error-stack = { version = "0.4.0", default-features = false, features = [
 ] }
 async-trait = { version = "0.1.80", default-features = false }
 regex = { version = "1.9.4", features = ["perf"], default-features = false }
-smallvec = { version = "1.13.1", features = [
-    "union",
-    "serde",
-], default-features = false }
 futures = { version = "0.3.30", default-features = false, features = ["alloc"] }
 dhat = { version = "0.3.2", optional = true, default-features = false }
 mimalloc = { version = "0.1.43", default-features = false }
 async-once-cell = { version = "0.5.3", default-features = false }
 actix-governor = { version = "0.5.0", default-features = false }
-mini-moka = { version = "0.10", optional = true, default-features = false, features = [
-    "sync",
+moka = { version = "0.12.8", optional = true, default-features = false, features = [
+    "future",
 ] }
 async-compression = { version = "0.4.12", default-features = false, features = [
     "brotli",
@@ -82,8 +80,8 @@ base64 = { version = "0.21.5", default-features = false, features = [
 cfg-if = { version = "1.0.0", default-features = false, optional = true }
 keyword_extraction = { version = "1.4.3", default-features = false, features = [
     "tf_idf",
+    "rayon",
 ] }
-
 stop-words = { version = "0.8.0", default-features = false, features = ["iso"] }
 thesaurus = { version = "0.5.2", default-features = false, optional = true, features = [
     "moby",
@@ -104,8 +102,6 @@ lightningcss = { version = "1.0.0-alpha.57", default-features = false, features
 # Temporary fork with fix
 minify-js = { git = "https://github.com/RuairidhWilliamson/minify-js", branch = "master", version = "0.6.0", default-features = false} 
 
-
-
 [profile.dev]
 opt-level = 0
 debug = true
@@ -180,7 +176,7 @@ opt-level = "z"
 use-synonyms-search = ["thesaurus/static"]
 default = ["memory-cache"]
 dhat-heap = ["dep:dhat"]
-memory-cache = ["dep:mini-moka"]
+memory-cache = ["dep:moka"]
 redis-cache = ["dep:redis", "dep:base64"]
 compress-cache-results = ["dep:async-compression", "dep:cfg-if"]
 encrypt-cache-results = ["dep:chacha20poly1305", "dep:chacha20"]

flake.lock

@@ -34,11 +34,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1695318763,
-        "narHash": "sha256-FHVPDRP2AfvsxAdc+AsgFJevMz5VBmnZglFUMlxBkcY=",
+        "lastModified": 1725194671,
+        "narHash": "sha256-tLGCFEFTB5TaOKkpfw3iYT9dnk4awTP/q4w+ROpMfuw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e12483116b3b51a185a33a272bf351e357ba9a99",
+        "rev": "b833ff01a0d694b910daca6e2ff4a3f26dee478c",
         "type": "github"
       },
       "original": {

flake.nix

@@ -36,7 +36,7 @@
             haskellPackages.hadolint
             nodejs
             nodePackages_latest.cspell
-            nodePackages_latest.eslint
+            eslint
             nodePackages_latest.markdownlint-cli2
             nodePackages_latest.stylelint
             redis

src/cache/cacher.rs

@@ -2,10 +2,9 @@
 //! from the upstream search engines in a json format.
 
 use error_stack::Report;
+use futures::future::join_all;
 #[cfg(feature = "memory-cache")]
-use mini_moka::sync::Cache as MokaCache;
-#[cfg(feature = "memory-cache")]
-use mini_moka::sync::ConcurrentCacheExt;
+use moka::future::Cache as MokaCache;
 
 #[cfg(feature = "memory-cache")]
 use std::time::Duration;
@@ -376,13 +375,13 @@ impl Cacher for RedisCache {
     }
 }
 /// TryInto implementation for SearchResults from Vec<u8>
-use std::convert::TryInto;
+use std::{convert::TryInto, sync::Arc};
 
 impl TryInto<SearchResults> for Vec<u8> {
     type Error = CacheError;
 
     fn try_into(self) -> Result<SearchResults, Self::Error> {
-        serde_json::from_slice(&self).map_err(|_| CacheError::SerializationError)
+        bincode::deserialize_from(self.as_slice()).map_err(|_| CacheError::SerializationError)
     }
 }
 
@@ -390,7 +389,7 @@ impl TryInto<Vec<u8>> for &SearchResults {
     type Error = CacheError;
 
     fn try_into(self) -> Result<Vec<u8>, Self::Error> {
-        serde_json::to_vec(self).map_err(|_| CacheError::SerializationError)
+        bincode::serialize(self).map_err(|_| CacheError::SerializationError)
     }
 }
 
@@ -398,7 +397,16 @@ impl TryInto<Vec<u8>> for &SearchResults {
 #[cfg(feature = "memory-cache")]
 pub struct InMemoryCache {
     /// The backend cache which stores data.
-    cache: MokaCache<String, Vec<u8>>,
+    cache: Arc<MokaCache<String, Vec<u8>>>,
+}
+
+#[cfg(feature = "memory-cache")]
+impl Clone for InMemoryCache {
+    fn clone(&self) -> Self {
+        Self {
+            cache: self.cache.clone(),
+        }
+    }
 }
 
 #[cfg(feature = "memory-cache")]
@@ -408,15 +416,17 @@ impl Cacher for InMemoryCache {
         log::info!("Initialising in-memory cache");
 
         InMemoryCache {
-            cache: MokaCache::builder()
-                .time_to_live(Duration::from_secs(config.cache_expiry_time.into()))
-                .build(),
+            cache: Arc::new(
+                MokaCache::builder()
+                    .time_to_live(Duration::from_secs(config.cache_expiry_time.into()))
+                    .build(),
+            ),
         }
     }
 
     async fn cached_results(&mut self, url: &str) -> Result<SearchResults, Report<CacheError>> {
         let hashed_url_string = self.hash_url(url);
-        match self.cache.get(&hashed_url_string) {
+        match self.cache.get(&hashed_url_string).await {
             Some(res) => self.post_process_search_results(res).await,
             None => Err(Report::new(CacheError::MissingValue)),
         }
@@ -427,13 +437,18 @@ impl Cacher for InMemoryCache {
         search_results: &[SearchResults],
         urls: &[String],
     ) -> Result<(), Report<CacheError>> {
+        let mut tasks: Vec<_> = Vec::with_capacity(urls.len());
         for (url, search_result) in urls.iter().zip(search_results.iter()) {
             let hashed_url_string = self.hash_url(url);
             let bytes = self.pre_process_search_results(search_result).await?;
-            self.cache.insert(hashed_url_string, bytes);
+            let new_self = self.clone();
+            tasks.push(tokio::spawn(async move {
+                new_self.cache.insert(hashed_url_string, bytes).await
+            }));
         }
 
-        self.cache.sync();
+        join_all(tasks).await;
+
         Ok(())
     }
 }
@@ -531,7 +546,7 @@ impl SharedCache {
     /// # Arguments
     ///
     /// * `url` - It takes the search url as an argument which will be used as the key to fetch the
-    /// cached results from the cache.
+    ///   cached results from the cache.
     ///
     /// # Error
     ///
@@ -548,9 +563,9 @@ impl SharedCache {
     /// # Arguments
     ///
     /// * `search_results` - It takes the `SearchResults` as an argument which are results that
-    /// needs to be cached.
+    ///   needs to be cached.
     /// * `url` - It takes the search url as an argument which will be used as the key for storing
-    /// results in the cache.
+    ///   results in the cache.
     ///
     /// # Error
     ///

src/cache/redis_cacher.rs

@@ -16,7 +16,7 @@ const REDIS_PIPELINE_SIZE: usize = 3;
 /// connect to.
 pub struct RedisCache {
     /// It stores a pool of connections ready to be used.
-    connection_pool: Vec<ConnectionManager>,
+    connection_pool: Box<[ConnectionManager]>,
     /// It stores the size of the connection pool (in other words the number of
     /// connections that should be stored in the pool).
     pool_size: u8,
@@ -58,13 +58,13 @@ impl RedisCache {
             }));
         }
 
-        let mut outputs = Vec::new();
+        let mut outputs = Vec::with_capacity(tasks.len());
         for task in tasks {
             outputs.push(task.await??);
         }
 
         let redis_cache = RedisCache {
-            connection_pool: outputs,
+            connection_pool: outputs.into_boxed_slice(),
             pool_size,
             current_connection: Default::default(),
             cache_ttl,

src/config/parser.rs

@@ -48,6 +48,8 @@ pub struct Config {
     pub tcp_connection_keep_alive: u8,
     /// It stores the pool idle connection timeout in seconds.
     pub pool_idle_connection_timeout: u8,
+    /// It stores the number of https connections to keep in the pool.
+    pub number_of_https_connections: u8,
 }
 
 impl Config {
@@ -57,7 +59,7 @@ impl Config {
     /// # Arguments
     ///
     /// * `logging_initialized` - It takes a boolean which ensures that the logging doesn't get
-    /// initialized twice. Pass false if the logger has not yet been initialized.
+    ///   initialized twice. Pass false if the logger has not yet been initialized.
     ///
     /// # Error
     ///
@@ -139,6 +141,7 @@ impl Config {
             request_timeout: globals.get::<_, u8>("request_timeout")?,
             tcp_connection_keep_alive: globals.get::<_, u8>("tcp_connection_keep_alive")?,
             pool_idle_connection_timeout: globals.get::<_, u8>("pool_idle_connection_timeout")?,
+            number_of_https_connections: globals.get::<_, u8>("number_of_https_connections")?,
             threads,
             client_connection_keep_alive: globals.get::<_, u8>("client_connection_keep_alive")?,
             rate_limiter: RateLimiter {

src/models/aggregation_models.rs

@@ -3,7 +3,6 @@
 
 use super::engine_models::EngineError;
 use serde::{Deserialize, Serialize};
-use smallvec::SmallVec;
 #[cfg(any(
     feature = "use-synonyms-search",
     feature = "use-non-static-synonyms-search"
@@ -12,7 +11,9 @@ use thesaurus::synonyms;
 /// A named struct to store the raw scraped search results scraped search results from the
 /// upstream search engines before aggregating it.It derives the Clone trait which is needed
 /// to write idiomatic rust using `Iterators`.
-/// (href url in html in simple words).
+///
+///   (href url in html in simple words).
+///
 #[derive(Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchResult {
@@ -23,7 +24,7 @@ pub struct SearchResult {
     /// The description of the search result.
     pub description: String,
     /// The names of the upstream engines from which this results were provided.
-    pub engine: SmallVec<[String; 0]>,
+    pub engine: Vec<String>,
     /// The td-tdf score of the result in regards to the title, url and description and the user's query
     pub relevance_score: f32,
 }
@@ -35,7 +36,7 @@ impl SearchResult {
     ///
     /// * `title` - The title of the search result.
     /// * `url` - The url which is accessed when clicked on it
-    /// (href url in html in simple words).
+    ///   (href url in html in simple words).
     /// * `description` - The description of the search result.
     /// * `engine` - The names of the upstream engines from which this results were provided.
     pub fn new(title: &str, url: &str, description: &str, engine: &[&str]) -> Self {
@@ -125,7 +126,7 @@ impl EngineErrorInfo {
     /// # Arguments
     ///
     /// * `error` - It takes the error type which occured while fetching the result from a particular
-    /// search engine.
+    ///   search engine.
     /// * `engine` - It takes the name of the engine that failed to provide the requested search results.
     pub fn new(error: &EngineError, engine: &str) -> Self {
         Self {
@@ -153,10 +154,10 @@ impl EngineErrorInfo {
 #[serde(rename_all = "camelCase")]
 pub struct SearchResults {
     /// Stores the individual serializable `SearchResult` struct into a vector of
-    pub results: Vec<SearchResult>,
+    pub results: Box<[SearchResult]>,
     /// Stores the information on which engines failed with their engine name
     /// and the type of error that caused it.
-    pub engine_errors_info: Vec<EngineErrorInfo>,
+    pub engine_errors_info: Box<[EngineErrorInfo]>,
     /// Stores the flag option which holds the check value that the following
     /// search query was disallowed when the safe search level set to 4 and it
     /// was present in the `Blocklist` file.
@@ -178,15 +179,15 @@ impl SearchResults {
     /// # Arguments
     ///
     /// * `results` - Takes an argument of individual serializable `SearchResult` struct
-    /// and stores it into a vector of `SearchResult` structs.
+    ///   and stores it into a vector of `SearchResult` structs.
     /// * `page_query` - Takes an argument of current page`s search query `q` provided in
-    /// the search url.
+    ///   the search url.
     /// * `engine_errors_info` - Takes an array of structs which contains information regarding
-    /// which engines failed with their names, reason and their severity color name.
-    pub fn new(results: Vec<SearchResult>, engine_errors_info: &[EngineErrorInfo]) -> Self {
+    ///   which engines failed with their names, reason and their severity color name.
+    pub fn new(results: Box<[SearchResult]>, engine_errors_info: Box<[EngineErrorInfo]>) -> Self {
         Self {
             results,
-            engine_errors_info: engine_errors_info.to_owned(),
+            engine_errors_info,
             disallowed: Default::default(),
             filtered: Default::default(),
             safe_search_level: Default::default(),
@@ -205,11 +206,11 @@ impl SearchResults {
     }
 
     /// A getter function that gets the value of `engine_errors_info`.
-    pub fn engine_errors_info(&mut self) -> Vec<EngineErrorInfo> {
+    pub fn engine_errors_info(&mut self) -> Box<[EngineErrorInfo]> {
         std::mem::take(&mut self.engine_errors_info)
     }
     /// A getter function that gets the value of `results`.
-    pub fn results(&mut self) -> Vec<SearchResult> {
+    pub fn results(&mut self) -> Box<[SearchResult]> {
         self.results.clone()
     }
 
@@ -254,27 +255,50 @@ fn calculate_tf_idf(
     let tf_idf = TfIdf::new(params);
     let tokener = Tokenizer::new(query, stop_words, Some(punctuation));
     let query_tokens = tokener.split_into_words();
-    let mut search_tokens = vec![];
 
-    for token in query_tokens {
-        #[cfg(any(
-            feature = "use-synonyms-search",
-            feature = "use-non-static-synonyms-search"
-        ))]
-        {
-            // find some synonyms and add them to the search  (from wordnet or moby if feature is enabled)
-            let synonyms = synonyms(&token);
-            search_tokens.extend(synonyms)
-        }
-        search_tokens.push(token);
-    }
+    #[cfg(any(
+        feature = "use-synonyms-search",
+        feature = "use-non-static-synonyms-search"
+    ))]
+    let mut extra_tokens = vec![];
 
-    let mut total_score = 0.0f32;
-    for token in search_tokens.iter() {
-        total_score += tf_idf.get_score(token);
-    }
+    let total_score: f32 = query_tokens
+        .iter()
+        .map(|token| {
+            #[cfg(any(
+                feature = "use-synonyms-search",
+                feature = "use-non-static-synonyms-search"
+            ))]
+            {
+                // find some synonyms and add them to the search  (from wordnet or moby if feature is enabled)
+                extra_tokens.extend(synonyms(token))
+            }
 
-    let result = total_score / (search_tokens.len() as f32);
+            tf_idf.get_score(token)
+        })
+        .sum();
+
+    #[cfg(not(any(
+        feature = "use-synonyms-search",
+        feature = "use-non-static-synonyms-search"
+    )))]
+    let result = total_score / (query_tokens.len() as f32);
+
+    #[cfg(any(
+        feature = "use-synonyms-search",
+        feature = "use-non-static-synonyms-search"
+    ))]
+    let extra_total_score: f32 = extra_tokens
+        .iter()
+        .map(|token| tf_idf.get_score(token))
+        .sum();
+
+    #[cfg(any(
+        feature = "use-synonyms-search",
+        feature = "use-non-static-synonyms-search"
+    ))]
+    let result =
+        (extra_total_score + total_score) / ((query_tokens.len() + extra_tokens.len()) as f32);
 
     f32::from(!result.is_nan()) * result
 }

src/models/parser_models.rs

@@ -29,7 +29,7 @@ impl Style {
     ///
     /// * `theme` - It takes the parsed theme option used to set a theme for the website.
     /// * `colorscheme` - It takes the parsed colorscheme option used to set a colorscheme
-    /// for the theme being used.
+    ///   for the theme being used.
     pub fn new(theme: String, colorscheme: String, animation: Option<String>) -> Self {
         Style {
             theme,

src/models/server_models.rs

@@ -11,7 +11,7 @@ use super::parser_models::Style;
 pub struct SearchParams {
     /// It stores the search parameter option `q` (or query in simple words)
     /// of the search url.
-    pub q: Option<String>,
+    pub q: Option<Cow<'static, str>>,
     /// It stores the search parameter `page` (or pageno in simple words)
     /// of the search url.
     pub page: Option<u32>,
@@ -29,7 +29,7 @@ pub struct Cookie<'a> {
     /// It stores the colorscheme name used for the website theme.
     pub colorscheme: Cow<'a, str>,
     /// It stores the user selected upstream search engines selected from the UI.
-    pub engines: Cow<'a, Vec<Cow<'a, str>>>,
+    pub engines: Cow<'a, [Cow<'a, str>]>,
     /// It stores the user selected safe search level from the UI.
     pub safe_search_level: u8,
 }

src/results/aggregator.rs

@@ -14,7 +14,6 @@ use futures::stream::FuturesUnordered;
 use regex::Regex;
 use reqwest::{Client, ClientBuilder};
 use std::sync::Arc;
-use std::time::{SystemTime, UNIX_EPOCH};
 use tokio::{
     fs::File,
     io::{AsyncBufReadExt, BufReader},
@@ -61,7 +60,7 @@ type FutureVec =
 /// * `debug` - Accepts a boolean value to enable or disable debug mode option.
 /// * `upstream_search_engines` - Accepts a vector of search engine names which was selected by the
 /// * `request_timeout` - Accepts a time (secs) as a value which controls the server request timeout.
-/// user through the UI or the config file.
+///   user through the UI or the config file.
 ///
 /// # Error
 ///
@@ -82,6 +81,7 @@ pub async fn aggregate(
                 config.pool_idle_connection_timeout as u64,
             ))
             .tcp_keepalive(Duration::from_secs(config.tcp_connection_keep_alive as u64))
+            .pool_max_idle_per_host(config.number_of_https_connections as usize)
             .connect_timeout(Duration::from_secs(config.request_timeout as u64)) // Add timeout to request to avoid DDOSing the server
             .https_only(true)
             .gzip(true)
@@ -93,13 +93,6 @@ pub async fn aggregate(
 
     let user_agent: &str = random_user_agent();
 
-    // Add a random delay before making the request.
-    if config.aggregator.random_delay || !config.debug {
-        let nanos = SystemTime::now().duration_since(UNIX_EPOCH)?.subsec_nanos() as f32;
-        let delay = ((nanos / 1_0000_0000 as f32).floor() as u64) + 1;
-        tokio::time::sleep(Duration::from_secs(delay)).await;
-    }
-
     let mut names: Vec<&str> = Vec::with_capacity(0);
 
     // create tasks for upstream result fetching
@@ -188,19 +181,21 @@ pub async fn aggregate(
         drop(blacklist_map);
     }
 
-    let mut results: Vec<SearchResult> = result_map
-        .iter()
-        .map(|(_, value)| {
-            let mut copy = value.clone();
-            if !copy.url.contains("temu.com") {
-                copy.calculate_relevance(query.as_str())
+    let mut results: Box<[SearchResult]> = result_map
+        .into_iter()
+        .map(|(_, mut value)| {
+            if !value.url.contains("temu.com") {
+                value.calculate_relevance(query.as_str())
             }
-            copy
+            value
         })
         .collect();
     sort_search_results(&mut results);
 
-    Ok(SearchResults::new(results, &engine_errors_info))
+    Ok(SearchResults::new(
+        results,
+        engine_errors_info.into_boxed_slice(),
+    ))
 }
 
 /// Filters a map of search results using a list of regex patterns.
@@ -265,7 +260,6 @@ fn sort_search_results(results: &mut [SearchResult]) {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use smallvec::smallvec;
     use std::io::Write;
     use tempfile::NamedTempFile;
 
@@ -281,7 +275,7 @@ mod tests {
                 description: "This domain is for use in illustrative examples in documents."
                     .to_owned(),
                 relevance_score: 0.0,
-                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
+                engine: vec!["Google".to_owned(), "Bing".to_owned()],
             },
         ));
         map_to_be_filtered.push((
@@ -290,7 +284,7 @@ mod tests {
                 title: "Rust Programming Language".to_owned(),
                 url: "https://www.rust-lang.org/".to_owned(),
                 description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_owned(),
-                engine: smallvec!["Google".to_owned(), "DuckDuckGo".to_owned()],
+                engine: vec!["Google".to_owned(), "DuckDuckGo".to_owned()],
                 relevance_score:0.0
             },)
         );
@@ -331,7 +325,7 @@ mod tests {
                 url: "https://www.example.com".to_owned(),
                 description: "This domain is for use in illustrative examples in documents."
                     .to_owned(),
-                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
+                engine: vec!["Google".to_owned(), "Bing".to_owned()],
                 relevance_score: 0.0,
             },
         ));
@@ -341,7 +335,7 @@ mod tests {
                 title: "Rust Programming Language".to_owned(),
                 url: "https://www.rust-lang.org/".to_owned(),
                 description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_owned(),
-                engine: smallvec!["Google".to_owned(), "DuckDuckGo".to_owned()],
+                engine: vec!["Google".to_owned(), "DuckDuckGo".to_owned()],
                 relevance_score:0.0
             },
         ));
@@ -398,7 +392,7 @@ mod tests {
                 url: "https://www.example.com".to_owned(),
                 description: "This domain is for use in illustrative examples in documents."
                     .to_owned(),
-                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
+                engine: vec!["Google".to_owned(), "Bing".to_owned()],
                 relevance_score: 0.0,
             },
         ));

src/server/routes/search.rs

@@ -14,7 +14,8 @@ use crate::{
 use actix_web::{get, http::header::ContentType, web, HttpRequest, HttpResponse};
 use itertools::Itertools;
 use regex::Regex;
-use std::borrow::Cow;
+use std::time::{SystemTime, UNIX_EPOCH};
+use std::{borrow::Cow, time::Duration};
 use tokio::{
     fs::File,
     io::{AsyncBufReadExt, BufReader},
@@ -83,6 +84,13 @@ pub async fn search(
             let previous_page = page.saturating_sub(1);
             let next_page = page + 1;
 
+            // Add a random delay before making the request.
+            if config.aggregator.random_delay || !config.debug {
+                let nanos = SystemTime::now().duration_since(UNIX_EPOCH)?.subsec_nanos() as f32;
+                let delay = ((nanos / 1_0000_0000 as f32).floor() as u64) + 1;
+                tokio::time::sleep(Duration::from_secs(delay)).await;
+            }
+
             let results: (SearchResults, String, bool);
             if page != previous_page {
                 let (previous_results, current_results, next_results) = join!(
@@ -96,9 +104,7 @@ pub async fn search(
                 let (results_list, cache_keys): (Vec<SearchResults>, Vec<String>) =
                     [previous_results?, results.clone(), next_results?]
                         .into_iter()
-                        .filter_map(|(result, cache_key, flag)| {
-                            dbg!(flag).then_some((result, cache_key))
-                        })
+                        .filter_map(|(result, cache_key, flag)| flag.then_some((result, cache_key)))
                         .multiunzip();
 
                 tokio::spawn(async move { cache.cache_results(&results_list, &cache_keys).await });
@@ -140,7 +146,7 @@ pub async fn search(
 /// # Arguments
 ///
 /// * `url` - It takes the url of the current page that requested the search results for a
-/// particular search query.
+///   particular search query.
 /// * `config` - It takes a parsed config struct.
 /// * `query` - It takes the page number as u32 value.
 /// * `req` - It takes the `HttpRequest` struct as a value.

src/templates/partials/search_bar.rs

@@ -12,7 +12,7 @@ const SAFE_SEARCH_LEVELS_NAME: [&str; 3] = ["None", "Low", "Moderate"];
 /// # Arguments
 ///
 /// * `engine_errors_info` - It takes the engine errors list containing errors for each upstream
-/// search engine which failed to provide results as an argument.
+///   search engine which failed to provide results as an argument.
 /// * `safe_search_level` - It takes the safe search level with values from 0-2 as an argument.
 /// * `query` - It takes the current search query provided by user as an argument.
 ///

src/templates/partials/settings_tabs/engines.rs

@@ -9,7 +9,7 @@ use maud::{html, Markup};
 /// # Arguments
 ///
 /// * `engine_names` - It takes the key value pair list of all available engine names and there corresponding
-/// selected (enabled/disabled) value as an argument.
+///   selected (enabled/disabled) value as an argument.
 ///
 /// # Returns
 ///

src/templates/partials/settings_tabs/user_interface.rs

@@ -11,9 +11,9 @@ use std::fs::read_dir;
 /// # Arguments
 ///
 /// * `style_type` - It takes the style type of the values `theme` and `colorscheme` as an
-/// argument.
+///   argument.
 /// * `selected_style` - It takes the currently selected style value provided via the config file
-/// as an argument.
+///   as an argument.
 ///
 /// # Error
 ///