Merge pull request #206 from neon-mmd/change-document-style-with-linter-warnings

Cargo.lock

@@ -3797,7 +3797,7 @@ dependencies = [
 
 [[package]]
 name = "websurfx"
-version = "0.20.0"
+version = "0.20.1"
 dependencies = [
  "actix-cors",
  "actix-files",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "websurfx"
-version = "0.20.0"
+version = "0.20.1"
 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"

src/cache/cacher.rs

@@ -10,17 +10,14 @@ use super::error::PoolError;
 
 /// A named struct which stores the redis Connection url address to which the client will
 /// connect to.
-///
-/// # Fields
-///
-/// * `connection_pool` - It stores a pool of connections ready to be used.
-/// * `pool_size` - It stores the size of the connection pool (in other words the number of
-/// connections that should be stored in the pool).
-/// * `current_connection` - It stores the index of which connection is being used at the moment.
 #[derive(Clone)]
 pub struct RedisCache {
+    /// It stores a pool of connections ready to be used.
     connection_pool: Vec<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,
+    /// It stores the index of which connection is being used at the moment.
     current_connection: u8,
 }
 

src/cache/error.rs

@@ -5,15 +5,12 @@ use std::fmt;
 use redis::RedisError;
 
 /// A custom error type used for handling redis async pool associated errors.
-///
-/// This enum provides variants three different categories of errors:
-/// * `RedisError` - This variant handles all errors related to `RedisError`,
-/// * `PoolExhaustionWithConnectionDropError` - This variant handles the error
-/// which occurs when all the connections in the connection pool return a connection
-/// dropped redis error.
 #[derive(Debug)]
 pub enum PoolError {
+    /// This variant handles all errors related to `RedisError`,
     RedisError(RedisError),
+    /// This variant handles the errors which occurs when all the connections
+    /// in the connection pool return a connection dropped redis error.
     PoolExhaustionWithConnectionDropError,
 }
 

src/cache/mod.rs

@@ -1,2 +1,5 @@
+//! This module provides the modules which provide the functionality to cache the aggregated
+//! results fetched and aggregated from the upstream search engines in a json format.
+
 pub mod cacher;
 pub mod error;

src/config/mod.rs

@@ -1,2 +1,5 @@
+//! This module provides the modules which handles the functionality to parse the lua config
+//! and convert the config options into rust readable form.
+
 pub mod parser;
 pub mod parser_models;

src/config/parser.rs

@@ -9,33 +9,33 @@ use mlua::Lua;
 use std::{collections::HashMap, fs, thread::available_parallelism};
 
 /// A named struct which stores the parsed config file options.
-///
-/// # Fields
-//
-/// * `port` - It stores the parsed port number option on which the server should launch.
-/// * `binding_ip` - It stores the parsed ip address option on which the server should launch
-/// * `style` - It stores the theming options for the website.
-/// * `redis_url` - It stores the redis connection url address on which the redis
-/// client should connect.
-/// * `aggregator` -  It stores the option to whether enable or disable production use.
-/// * `logging` - It stores the option to whether enable or disable logs.
-/// * `debug` - It stores the option to whether enable or disable debug mode.
-/// * `upstream_search_engines` - It stores all the engine names that were enabled by the user.
-/// * `request_timeout` - It stores the time (secs) which controls the server request timeout.
-/// * `threads` - It stores the number of threads which controls the app will use to run.
 #[derive(Clone)]
 pub struct Config {
+    /// It stores the parsed port number option on which the server should launch.
     pub port: u16,
+    /// It stores the parsed ip address option on which the server should launch
     pub binding_ip: String,
+    /// It stores the theming options for the website.
     pub style: Style,
+    /// It stores the redis connection url address on which the redis
+    /// client should connect.
     pub redis_url: String,
+    /// It stores the option to whether enable or disable production use.
     pub aggregator: AggregatorConfig,
+    /// It stores the option to whether enable or disable logs.
     pub logging: bool,
+    /// 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::engines::engine_models::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.
     pub threads: u8,
+    /// It stores configuration options for the ratelimiting middleware.
     pub rate_limiter: RateLimiter,
+    /// It stores the level of safe search to be used for restricting content in the
+    /// search results.
     pub safe_search: u8,
 }
 
@@ -123,6 +123,11 @@ impl Config {
 }
 
 /// a helper function that sets the proper logging level
+///
+/// # Arguments
+///
+/// * `debug` - It takes the option to whether enable or disable debug mode.
+/// * `logging` - It takes the option to whether enable or disable logs.
 fn set_logging_level(debug: bool, logging: bool) {
     if let Ok(pkg_env_var) = std::env::var("PKG_ENV") {
         if pkg_env_var.to_lowercase() == "dev" {

src/config/parser_models.rs

@@ -12,15 +12,12 @@ use serde::{Deserialize, Serialize};
 /// order to allow the deserializing the json back to struct in aggregate function in
 /// aggregator.rs and create a new struct out of it and then serialize it back to json and pass
 /// it to the template files.
-///
-/// # Fields
-//
-/// * `theme` - It stores the parsed theme option used to set a theme for the website.
-/// * `colorscheme` - It stores the parsed colorscheme option used to set a colorscheme for the
-/// theme being used.
 #[derive(Serialize, Deserialize, Clone, Default)]
 pub struct Style {
+    /// It stores the parsed theme option used to set a theme for the website.
     pub theme: String,
+    /// It stores the parsed colorscheme option used to set a colorscheme for the
+    /// theme being used.
     pub colorscheme: String,
 }
 
@@ -38,24 +35,18 @@ impl Style {
 }
 
 /// Configuration options for the aggregator.
-///
-/// # Fields
-///
-/// * `random_delay` - It stores the option to whether enable or disable random delays between
-/// requests.
 #[derive(Clone)]
 pub struct AggregatorConfig {
+    /// It stores the option to whether enable or disable random delays between
+    /// requests.
     pub random_delay: bool,
 }
 
 /// Configuration options for the rate limiter middleware.
-///
-/// # Fields
-///
-/// * `number_of_requests` - The number of request that are allowed within a provided time limit.
-/// * `time_limit` - The time limit in which the quantity of requests that should be accepted.
 #[derive(Clone)]
 pub struct RateLimiter {
+    /// The number of request that are allowed within a provided time limit.
     pub number_of_requests: u8,
+    /// The time limit in which the quantity of requests that should be accepted.
     pub time_limit: u8,
 }

src/engines/duckduckgo.rs

@@ -19,24 +19,6 @@ pub struct DuckDuckGo;
 
 #[async_trait::async_trait]
 impl SearchEngine for DuckDuckGo {
-    /// This function scrapes results from the upstream engine duckduckgo 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.
-    ///
-    /// # Arguments
-    ///
-    /// * `query` - Takes the user provided query to query to the upstream search engine with.
-    /// * `page` - Takes an u32 as an argument.
-    /// * `user_agent` - Takes a random user agent string as an argument.
-    /// * `request_timeout` - Takes a time (secs) as a value which controls the server request timeout.
-    ///
-    /// # Errors
-    ///
-    /// Returns an `EngineErrorKind` if the user is not connected to the internet or if their is failure to
-    /// reach the above `upstream search engine` page or if the `upstream search engine` is unable to
-    /// provide results for the requested search query and also returns error if the scraping selector
-    /// or HeaderMap fails to initialize.
     async fn results(
         &self,
         query: &str,

src/engines/engine_models.rs

@@ -6,19 +6,18 @@ use error_stack::{Result, ResultExt};
 use std::{collections::HashMap, fmt, time::Duration};
 
 /// A custom error type used for handle engine associated errors.
-///
-/// This enum provides variants three different categories of errors:
-/// * `RequestError` - This variant handles all request related errors like forbidden, not found,
-/// etc.
-/// * `EmptyResultSet` - This variant handles the not results found error provide by the upstream
-/// search engines.
-/// * `UnexpectedError` - This variant handles all the errors which are unexpected or occur rarely
-/// and are errors mostly related to failure in initialization of HeaderMap, Selector errors and
-/// all other errors occurring within the code handling the `upstream search engines`.
 #[derive(Debug)]
 pub enum EngineError {
+    /// This variant handles all request related errors like forbidden, not found,
+    /// etc.
     EmptyResultSet,
+    /// This variant handles the not results found error provide by the upstream
+    /// search engines.
     RequestError,
+    ///  This variant handles all the errors which are unexpected or occur rarely
+    /// and are errors mostly related to failure in initialization of HeaderMap,
+    /// Selector errors and all other errors occurring within the code handling
+    /// the `upstream search engines`.
     UnexpectedError,
 }
 
@@ -46,6 +45,23 @@ impl error_stack::Context for EngineError {}
 /// A trait to define common behavior for all search engines.
 #[async_trait::async_trait]
 pub trait SearchEngine: Sync + Send {
+    /// This helper function fetches/requests the search results from the upstream search engine in
+    /// an html form.
+    ///
+    /// # Arguments
+    ///
+    /// * `url` - It takes the url of the upstream search engine with the user requested search
+    /// query appended in the search parameters.
+    /// * `header_map` - It takes the http request headers to be sent to the upstream engine in
+    /// order to prevent being detected as a bot. It takes the header as a HeaderMap type.
+    /// * `request_timeout` - It takes the request timeout value as seconds which is used to limit
+    /// the amount of time for each request to remain connected when until the results can be provided
+    /// by the upstream engine.
+    ///
+    /// # Error
+    ///
+    /// It returns the html data as a string if the upstream engine provides the data as expected
+    /// otherwise it returns a custom `EngineError`.
     async fn fetch_html_from_upstream(
         &self,
         url: &str,
@@ -65,6 +81,24 @@ pub trait SearchEngine: Sync + Send {
             .change_context(EngineError::RequestError)?)
     }
 
+    /// This function scrapes results from the upstream engine 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.
+    ///
+    /// # Arguments
+    ///
+    /// * `query` - Takes the user provided query to query to the upstream search engine with.
+    /// * `page` - Takes an u32 as an argument.
+    /// * `user_agent` - Takes a random user agent string as an argument.
+    /// * `request_timeout` - Takes a time (secs) as a value which controls the server request timeout.
+    ///
+    /// # Errors
+    ///
+    /// Returns an `EngineErrorKind` if the user is not connected to the internet or if their is failure to
+    /// reach the above `upstream search engine` page or if the `upstream search engine` is unable to
+    /// provide results for the requested search query and also returns error if the scraping selector
+    /// or HeaderMap fails to initialize.
     async fn results(
         &self,
         query: &str,
@@ -75,8 +109,12 @@ pub trait SearchEngine: Sync + Send {
     ) -> Result<HashMap<String, SearchResult>, EngineError>;
 }
 
+/// A named struct which stores the engine struct with the name of the associated engine.
 pub struct EngineHandler {
+    /// It stores the engine struct wrapped in a box smart pointer as the engine struct implements
+    /// the `SearchEngine` trait.
     engine: Box<dyn SearchEngine>,
+    /// It stores the name of the engine to which the struct is associated to.
     name: &'static str,
 }
 
@@ -87,7 +125,15 @@ impl Clone for EngineHandler {
 }
 
 impl EngineHandler {
-    /// parses an engine name into an engine handler, returns none if the engine is unknown
+    /// Parses an engine name into an engine handler.
+    ///
+    /// # Arguments
+    ///
+    /// * `engine_name` - It takes the name of the engine to which the struct was associated to.
+    ///
+    /// # 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> {
         let engine: (&'static str, Box<dyn SearchEngine>) =
             match engine_name.to_lowercase().as_str() {
@@ -102,6 +148,8 @@ impl EngineHandler {
         })
     }
 
+    /// This function converts the EngineHandler type into a tuple containing the engine name and
+    /// the associated engine struct.
     pub fn into_name_engine(self) -> (&'static str, Box<dyn SearchEngine>) {
         (self.name, self.engine)
     }

src/engines/mod.rs

@@ -1,3 +1,8 @@
+//! This module provides different modules which handles the functionlity to fetch results from the
+//! upstream search engines based on user requested queries. Also provides different models to
+//! provide a standard functions to be implemented for all the upstream search engine handling
+//! code. Moreover, it also provides a custom error for the upstream search engine handling code.
+
 pub mod duckduckgo;
 pub mod engine_models;
 pub mod searx;

src/engines/searx.rs

@@ -17,25 +17,6 @@ pub struct Searx;
 
 #[async_trait::async_trait]
 impl SearchEngine for Searx {
-    /// This function scrapes results from the upstream engine duckduckgo 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.
-    ///
-    /// # Arguments
-    ///
-    /// * `query` - Takes the user provided query to query to the upstream search engine with.
-    /// * `page` - Takes an u32 as an argument.
-    /// * `user_agent` - Takes a random user agent string as an argument.
-    /// * `request_timeout` - Takes a time (secs) as a value which controls the server request timeout.
-    ///
-    /// # Errors
-    ///
-    /// Returns an `EngineErrorKind` if the user is not connected to the internet or if their is failure to
-    /// reach the above `upstream search engine` page or if the `upstream search engine` is unable to
-    /// provide results for the requested search query and also returns error if the scraping selector
-    /// or HeaderMap fails to initialize.
-
     async fn results(
         &self,
         query: &str,

src/handler/mod.rs

@@ -1 +1,5 @@
+//! This module provides modules which provide the functionality to handle paths for different
+//! files present on different paths and provide one appropriate path on which it is present and
+//! can be used.
+
 pub mod paths;

src/handler/paths.rs

@@ -7,42 +7,46 @@ use std::path::Path;
 use std::sync::OnceLock;
 
 // ------- Constants --------
-static PUBLIC_DIRECTORY_NAME: &str = "public";
-static COMMON_DIRECTORY_NAME: &str = "websurfx";
-static CONFIG_FILE_NAME: &str = "config.lua";
-static ALLOWLIST_FILE_NAME: &str = "allowlist.txt";
-static BLOCKLIST_FILE_NAME: &str = "blocklist.txt";
+/// The constant holding the name of the theme folder.
+const PUBLIC_DIRECTORY_NAME: &str = "public";
+/// The constant holding the name of the common folder.
+const COMMON_DIRECTORY_NAME: &str = "websurfx";
+/// The constant holding the name of the config file.
+const CONFIG_FILE_NAME: &str = "config.lua";
+/// The constant holding the name of the AllowList text file.
+const ALLOWLIST_FILE_NAME: &str = "allowlist.txt";
+/// The constant holding the name of the BlockList text file.
+const BLOCKLIST_FILE_NAME: &str = "blocklist.txt";
 
+/// An enum type which provides different variants to handle paths for various files/folders.
 #[derive(Hash, PartialEq, Eq, Debug)]
 pub enum FileType {
+    /// This variant handles all the paths associated with the config file.
     Config,
+    /// This variant handles all the paths associated with the Allowlist text file.
     AllowList,
+    /// This variant handles all the paths associated with the BlockList text file.
     BlockList,
+    /// This variant handles all the paths associated with the public folder (Theme folder).
     Theme,
 }
 
+/// A static variable which stores the different filesystem paths for various file/folder types.
 static FILE_PATHS_FOR_DIFF_FILE_TYPES: OnceLock<HashMap<FileType, Vec<String>>> = OnceLock::new();
 
-/// A helper function which returns an appropriate config file path checking if the config
-/// file exists on that path.
+/// A function which returns an appropriate path for thr provided file type by checking if the path
+/// for the given file type exists on that path.
 ///
 /// # Error
 ///
-/// Returns a `config file not found!!` error if the config file is not present under following
-/// paths which are:
-/// 1. `~/.config/websurfx/` if it not present here then it fallbacks to the next one (2)
-/// 2. `/etc/xdg/websurfx/config.lua` if it is not present here then it fallbacks to the next
-///    one (3).
-/// 3. `websurfx/` (under project folder ( or codebase in other words)) if it is not present
-///    here then it returns an error as mentioned above.
-
-/// A function which returns an appropriate theme directory path checking if the theme
-/// directory exists on that path.
+/// Returns a `<File Name> folder/file not found!!` error if the give file_type folder/file is not
+/// present on the path on which it is being tested.
 ///
-/// # Error
+/// # Example
+///
+/// If this function is give the file_type of Theme variant then the theme folder is checked by the
+/// following steps:
 ///
-/// Returns a `Theme (public) folder not found!!` error if the theme folder is not present under following
-/// paths which are:
 /// 1. `/opt/websurfx` if it not present here then it fallbacks to the next one (2)
 /// 2. Under project folder ( or codebase in other words) if it is not present
 ///    here then it returns an error as mentioned above.
@@ -110,6 +114,6 @@ pub fn file_path(file_type: FileType) -> Result<&'static str, Error> {
     // if no of the configs above exist, return error
     Err(Error::new(
         std::io::ErrorKind::NotFound,
-        format!("{:?} file not found!!", file_type),
+        format!("{:?} file/folder not found!!", file_type),
     ))
 }

src/lib.rs

@@ -1,6 +1,10 @@
 //! This main library module provides the functionality to provide and handle the Tcp server
 //! and register all the routes for the `websurfx` meta search engine website.
 
+#![forbid(unsafe_code, clippy::panic)]
+#![deny(missing_docs, clippy::missing_docs_in_private_items, clippy::perf)]
+#![warn(clippy::cognitive_complexity, rust_2018_idioms)]
+
 pub mod cache;
 pub mod config;
 pub mod engines;
@@ -41,7 +45,7 @@ use handler::paths::{file_path, FileType};
 /// let server = run(listener,config).expect("Failed to start server");
 /// ```
 pub fn run(listener: TcpListener, config: Config) -> std::io::Result<Server> {
-    let mut handlebars: Handlebars = Handlebars::new();
+    let mut handlebars: Handlebars<'_> = Handlebars::new();
 
     let public_folder_path: &str = file_path(FileType::Theme)?;
 
@@ -49,7 +53,7 @@ pub fn run(listener: TcpListener, config: Config) -> std::io::Result<Server> {
         .register_templates_directory(".html", format!("{}/templates", public_folder_path))
         .unwrap();
 
-    let handlebars_ref: web::Data<Handlebars> = web::Data::new(handlebars);
+    let handlebars_ref: web::Data<Handlebars<'_>> = web::Data::new(handlebars);
 
     let cloned_config_threads_opt: u8 = config.threads;
 

src/results/aggregation_models.rs

@@ -9,20 +9,17 @@ use crate::{config::parser_models::Style, engines::engine_models::EngineError};
 /// 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`.
-///
-/// # Fields
-///
-/// * `title` - The title of the search result.
-/// * `url` - The url which is accessed when clicked on it
 /// (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.
-#[derive(Clone, Serialize, Deserialize, Debug)]
+#[derive(Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchResult {
+    /// The title of the search result.
     pub title: String,
+    /// The url which is accessed when clicked on it
     pub url: String,
+    /// 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]>,
 }
 
@@ -64,14 +61,27 @@ impl SearchResult {
     }
 }
 
+/// A named struct that stores the error info related to the upstream search engines.
 #[derive(Serialize, Deserialize, Clone)]
 pub struct EngineErrorInfo {
+    /// It stores the error type which occured while fetching the result from a particular search
+    /// engine.
     pub error: String,
+    /// It stores the name of the engine that failed to provide the requested search results.
     pub engine: String,
+    /// It stores the name of the color to indicate whether how severe the particular error is (In
+    /// other words it indicates the severity of the error/issue).
     pub severity_color: String,
 }
 
 impl EngineErrorInfo {
+    /// Constructs a new `SearchResult` with the given arguments needed for the struct.
+    ///
+    /// # Arguments
+    ///
+    /// * `error` - It takes the error type which occured while fetching the result from a particular
+    /// 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 {
             error: match error {
@@ -91,25 +101,26 @@ impl EngineErrorInfo {
 
 /// A named struct to store, serialize, deserialize the all the search results scraped and
 /// aggregated from the upstream search engines.
-///
-/// # Fields
-///
-/// * `results` - Stores the individual serializable `SearchResult` struct into a vector of
 /// `SearchResult` structs.
-/// * `page_query` - Stores the current pages search query `q` provided in the search url.
-/// * `style` - Stores the theming options for the website.
-/// * `engine_errors_info` - Stores the information on which engines failed with their engine name
-/// and the type of error that caused it.
-/// * `empty_result_set` - Stores a boolean which indicates that no engines gave a result for the
-/// given search query.
 #[derive(Serialize, Deserialize, Default)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchResults {
+    /// Stores the individual serializable `SearchResult` struct into a vector of
     pub results: Vec<SearchResult>,
+    /// Stores the current pages search query `q` provided in the search url.
     pub page_query: String,
+    /// Stores the theming options for the website.
     pub style: Style,
+    /// 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>,
+    /// 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.
     pub disallowed: bool,
+    /// Stores the flag option which holds the check value that the following
+    /// search query was filtered when the safe search level set to 3 and it
+    /// was present in the `Blocklist` file.
     pub filtered: bool,
 }
 
@@ -122,9 +133,8 @@ impl SearchResults {
     /// 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.
-    /// * `empty_result_set` - Takes a boolean which indicates that no engines gave a result for the
-    /// given search query.
-    /// * ``
+    /// * `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>,
         page_query: &str,

src/results/mod.rs

@@ -1,3 +1,7 @@
+//! This module provides modules that handle the functionality to aggregate the fetched search
+//! results from the upstream search engines and filters it if safe search is set to 3 or 4. Also,
+//! provides various models to aggregate search results into a standardized form.
+
 pub mod aggregation_models;
 pub mod aggregator;
 pub mod user_agent;

src/results/user_agent.rs

@@ -4,6 +4,8 @@ use std::sync::OnceLock;
 
 use fake_useragent::{Browsers, UserAgents, UserAgentsBuilder};
 
+/// A static variable which stores the initially build `UserAgents` struct. So as it can be resused
+/// again and again without the need of reinitializing the `UserAgents` struct.
 static USER_AGENTS: OnceLock<UserAgents> = OnceLock::new();
 
 /// A function to generate random user agent to improve privacy of the user.

src/server/mod.rs

@@ -1 +1,6 @@
+//! This module provides modules that handle the functionality of handling different routes/paths
+//! for the `websurfx` search engine website. Also it handles the parsing of search parameters in
+//! the search route. Also, caches the next, current and previous search results in the search
+//! routes with the help of the redis server.
+
 pub mod routes;

src/server/routes.rs

@@ -25,17 +25,16 @@ use tokio::join;
 static REDIS_CACHE: async_once_cell::OnceCell<RedisCache> = async_once_cell::OnceCell::new();
 
 /// A named struct which deserializes all the user provided search parameters and stores them.
-///
-/// # Fields
-///
-/// * `q` - It stores the search parameter option `q` (or query in simple words)
-/// of the search url.
-/// * `page` - It stores the search parameter `page` (or pageno in simple words)
-/// of the search url.
 #[derive(Deserialize)]
 struct SearchParams {
+    /// It stores the search parameter option `q` (or query in simple words)
+    /// of the search url.
     q: Option<String>,
+    /// It stores the search parameter `page` (or pageno in simple words)
+    /// of the search url.
     page: Option<u32>,
+    /// It stores the search parameter `safesearch` (or safe search level in simple words) of the
+    /// search url.
     safesearch: Option<u8>,
 }
 
@@ -63,17 +62,14 @@ pub async fn not_found(
 }
 
 /// A named struct which is used to deserialize the cookies fetched from the client side.
-///
-/// # Fields
-///
-/// * `theme` - It stores the theme name used in the website.
-/// * `colorscheme` - It stores the colorscheme name used for the website theme.
-/// * `engines` - It stores the user selected upstream search engines selected from the UI.
 #[allow(dead_code)]
 #[derive(Deserialize)]
 struct Cookie<'a> {
+    /// It stores the theme name used in the website.
     theme: &'a str,
+    /// It stores the colorscheme name used for the website theme.
     colorscheme: &'a str,
+    /// It stores the user selected upstream search engines selected from the UI.
     engines: Vec<&'a str>,
 }
 
@@ -174,8 +170,21 @@ pub async fn search(
     }
 }
 
-/// Fetches the results for a query and page.
-/// First checks the redis cache, if that fails it gets proper results
+/// Fetches the results for a query and page. It First checks the redis cache, if that
+/// fails it gets proper results by requesting from the upstream search engines.
+///
+/// # Arguments
+///
+/// * `url` - It takes the url of the current page that requested the search results for a
+/// 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.
+///
+/// # Error
+///
+/// It returns the `SearchResults` struct if the search results could be successfully fetched from
+/// the cache or from the upstream search engines otherwise it returns an appropriate error.
 async fn results(
     url: String,
     config: &Config,
@@ -184,6 +193,7 @@ async fn results(
     req: HttpRequest,
     safe_search: u8,
 ) -> Result<SearchResults, Box<dyn std::error::Error>> {
+    // Initialize redis cache connection struct
     let mut redis_cache: RedisCache = REDIS_CACHE
         .get_or_init(async {
             // Initialize redis cache connection pool only one and store it in the heap.
@@ -191,7 +201,6 @@ async fn results(
         })
         .await
         .clone();
-
     // fetch the cached results json.
     let cached_results_json: Result<String, error_stack::Report<crate::cache::error::PoolError>> =
         redis_cache.clone().cached_json(&url).await;
@@ -223,7 +232,8 @@ async fn results(
             // UI and use that.
             let mut results: SearchResults = match req.cookie("appCookie") {
                 Some(cookie_value) => {
-                    let cookie_value: Cookie = serde_json::from_str(cookie_value.name_value().1)?;
+                    let cookie_value: Cookie<'_> =
+                        serde_json::from_str(cookie_value.name_value().1)?;
 
                     let engines: Vec<EngineHandler> = cookie_value
                         .engines
@@ -267,6 +277,8 @@ async fn results(
     }
 }
 
+/// A helper function which checks whether the search query contains any keywords which should be
+/// disallowed/allowed based on the regex based rules present in the blocklist and allowlist files.
 fn is_match_from_filter_list(
     file_path: &str,
     query: &str,