feat: add config struct

Cargo.lock

@@ -1739,7 +1739,6 @@ dependencies = [
  "infer",
  "rand",
  "regex",
- "serde",
  "teloxide",
  "tempfile",
  "thiserror 2.0.16",

Cargo.toml

@@ -14,7 +14,6 @@ futures = "0.3"
 infer = "0.19"
 rand = "0.9"
 regex = "1.11"
-serde = { version = "1.0", features = ["derive"] }
 teloxide = { version = "0.17", features = ["macros"] }
 tempfile = "3"
 thiserror = "2.0"

src/commands.rs

@@ -1,7 +1,6 @@
+use crate::comments::global_comments;
 use teloxide::{prelude::*, utils::command::BotCommands};
 
-use crate::comments::{Comments, global_comments};
-
 #[derive(BotCommands, Clone)]
 #[command(rename_rule = "lowercase")]
 pub enum Command {
@@ -25,9 +24,8 @@ pub async fn answer(bot: Bot, msg: Message, cmd: Command) -> ResponseResult<()>
                 .await?
         }
         Command::Curse => {
-            let comment = global_comments().map(Comments::build_caption);
-            bot.send_message(msg.chat.id, comment.unwrap_or_else(|| "To comment".into()))
-                .await?
+            let comment = global_comments().build_caption();
+            bot.send_message(msg.chat.id, comment).await?
         }
     };
 

src/comments.rs

@@ -7,6 +7,8 @@ use std::{
 };
 use tokio::fs::read_to_string;
 
+static GLOBAL_COMMENTS: OnceLock<Comments> = OnceLock::new();
+
 const DISCLAIMER: &str = "(Roleplay — fictional messages for entertainment.)";
 pub const TELEGRAM_CAPTION_LIMIT: usize = 4096;
 const FALLBACK_COMMENTS: &[&str] = &[
@@ -92,26 +94,28 @@ impl Comments {
     pub fn lines(&self) -> &[String] {
         &self.lines
     }
-}
-
-static GLOBAL_COMMENTS: OnceLock<Comments> = OnceLock::new();
 
     /// Initialize the global comments (call once at startup).
     ///
     /// # Errors
     ///
-/// - Returns `Error::Other` when the global is already initialized.
-pub fn init_global_comments(comments: Comments) -> Result<()> {
+    /// Returns `Error::Other` when the global is already initialized.
+    pub fn init(self) -> Result<()> {
         GLOBAL_COMMENTS
-        .set(comments)
+            .set(self)
             .map_err(|_| Error::other("comments already initialized"))
     }
+}
 
-/// Get global comments (if initialized).
+/// Get global comments (initialized by `Comments::init(self)`).
+///
+/// # Panics
+///
+/// Panics if comments have not been initialized.
 #[inline]
 #[must_use]
-pub fn global_comments() -> Option<&'static Comments> {
-    GLOBAL_COMMENTS.get()
+pub fn global_comments() -> &'static Comments {
+    GLOBAL_COMMENTS.get().expect("comments not initialized")
 }
 
 impl Display for Comments {

src/config.rs

@@ -0,0 +1,111 @@
+use crate::error::{Error, Result};
+use std::{env, fmt::Debug, path::PathBuf, sync::OnceLock};
+
+static GLOBAL_CONFIG: OnceLock<Config> = OnceLock::new();
+
+#[derive(Debug, Clone, Default)]
+pub struct Config {
+    pub youtube: YoutubeConfig,
+    pub instagram: InstagramConfig,
+    pub tiktok: TiktokConfig,
+    pub twitter: TwitterConfig,
+}
+
+#[derive(Debug, Clone)]
+pub struct YoutubeConfig {
+    pub cookies_path: Option<PathBuf>,
+    pub postprocessor_args: String,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct InstagramConfig {
+    pub cookies_path: Option<PathBuf>,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct TiktokConfig {
+    pub cookies_path: Option<PathBuf>,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct TwitterConfig {
+    pub cookies_path: Option<PathBuf>,
+}
+
+impl Config {
+    /// Load configuration from environment variables.
+    #[must_use]
+    pub fn from_env() -> Self {
+        Self {
+            youtube: YoutubeConfig::from_env(),
+            instagram: InstagramConfig::from_env(),
+            tiktok: TiktokConfig::from_env(),
+            twitter: TwitterConfig::from_env(),
+        }
+    }
+
+    /// Initialize the global config (call once at startup).
+    ///
+    /// # Errors
+    ///
+    /// Returns error if config is already initialized.
+    pub fn init(self) -> Result<()> {
+        GLOBAL_CONFIG
+            .set(self)
+            .map_err(|_| Error::other("config already initialized"))
+    }
+}
+/// Get global config (initialized by `Config::init(self)`).
+#[must_use]
+pub fn global_config() -> Config {
+    GLOBAL_CONFIG.get().cloned().unwrap_or_default()
+}
+
+impl YoutubeConfig {
+    const DEFAULT_POSTPROCESSOR_ARGS: &'static str = "ffmpeg:-vf setsar=1 -c:v libx264 -crf 20 -preset ultrafast -c:a aac -b:a 128k -movflags +faststart";
+
+    fn from_env() -> Self {
+        Self {
+            cookies_path: get_path_from_env("YOUTUBE_SESSION_COOKIE_PATH"),
+            postprocessor_args: env::var("YOUTUBE_POSTPROCESSOR_ARGS")
+                .unwrap_or_else(|_| Self::DEFAULT_POSTPROCESSOR_ARGS.to_string()),
+        }
+    }
+}
+
+impl InstagramConfig {
+    fn from_env() -> Self {
+        Self {
+            cookies_path: get_path_from_env("IG_SESSION_COOKIE_PATH"),
+        }
+    }
+}
+
+impl TiktokConfig {
+    fn from_env() -> Self {
+        Self {
+            cookies_path: get_path_from_env("TIKTOK_SESSION_COOKIE_PATH"),
+        }
+    }
+}
+
+impl TwitterConfig {
+    fn from_env() -> Self {
+        Self {
+            cookies_path: get_path_from_env("TWITTER_SESSION_COOKIE_PATH"),
+        }
+    }
+}
+
+fn get_path_from_env(key: &str) -> Option<PathBuf> {
+    env::var(key).ok().map(PathBuf::from)
+}
+
+impl Default for YoutubeConfig {
+    fn default() -> Self {
+        Self {
+            cookies_path: None,
+            postprocessor_args: Self::DEFAULT_POSTPROCESSOR_ARGS.into(),
+        }
+    }
+}

src/download.rs

@@ -1,3 +1,4 @@
+use crate::config::global_config;
 use crate::{
     error::{Error, Result},
     utils::{
@@ -8,7 +9,6 @@ use crate::{
 use futures::{StreamExt, stream};
 use std::{
     cmp::min,
-    env,
     ffi::OsStr,
     fs::{self, metadata},
     path::{Path, PathBuf},
@@ -105,21 +105,12 @@ async fn run_command_in_tempdir(cmd: &str, args: &[&str]) -> Result<DownloadResu
 /// - Propagates `run_command_in_tempdir` errors.
 #[cfg(feature = "instagram")]
 pub async fn download_instagram(url: impl Into<String>) -> Result<DownloadResult> {
-    let base_args = ["-t", "mp4", "--extractor-args", "instagram:"];
-    let mut args = base_args
+    let config = global_config();
+    let args = ["-t", "mp4", "--extractor-args", "instagram:"]
         .iter()
         .map(ToString::to_string)
-        .collect::<Vec<_>>();
-
-    if let Ok(cookies_path) = env::var("IG_SESSION_COOKIE_PATH") {
-        args.extend(["--cookies".into(), cookies_path]);
-    }
-
-    args.push(url.into());
-
-    let args_ref = args.iter().map(String::as_ref).collect::<Vec<_>>();
-
-    run_command_in_tempdir("yt-dlp", &args_ref).await
+        .collect();
+    run_yt_dlp(args, config.instagram.cookies_path.as_ref(), &url.into()).await
 }
 
 /// Download a Tiktok URL with yt-dlp.
@@ -129,21 +120,12 @@ pub async fn download_instagram(url: impl Into<String>) -> Result<DownloadResult
 /// - Propagates `run_command_in_tempdir` errors.
 #[cfg(feature = "tiktok")]
 pub async fn download_tiktok(url: impl Into<String>) -> Result<DownloadResult> {
-    let base_args = ["-t", "mp4", "--extractor-args", "tiktok:"];
-    let mut args = base_args
+    let config = global_config();
+    let args = ["-t", "mp4", "--extractor-args", "tiktok:"]
         .iter()
         .map(ToString::to_string)
-        .collect::<Vec<_>>();
-
-    if let Ok(cookies_path) = env::var("TIKTOK_SESSION_COOKIE_PATH") {
-        args.extend(["--cookies".into(), cookies_path]);
-    }
-
-    args.push(url.into());
-
-    let args_ref = args.iter().map(String::as_ref).collect::<Vec<_>>();
-
-    run_command_in_tempdir("yt-dlp", &args_ref).await
+        .collect();
+    run_yt_dlp(args, config.tiktok.cookies_path.as_ref(), &url.into()).await
 }
 
 /// Download a Twitter URL with yt-dlp.
@@ -153,8 +135,12 @@ pub async fn download_tiktok(url: impl Into<String>) -> Result<DownloadResult> {
 /// - Propagates `run_command_in_tempdir` errors.
 #[cfg(feature = "twitter")]
 pub async fn download_twitter(url: impl Into<String>) -> Result<DownloadResult> {
-    let args = ["-t", "mp4", "--extractor-args", "twitter:", &url.into()];
-    run_command_in_tempdir("yt-dlp", &args).await
+    let config = global_config();
+    let args = ["-t", "mp4", "--extractor-args", "twitter:"]
+        .iter()
+        .map(ToString::to_string)
+        .collect();
+    run_yt_dlp(args, config.twitter.cookies_path.as_ref(), &url.into()).await
 }
 
 /// Download a URL with yt-dlp.
@@ -164,7 +150,8 @@ pub async fn download_twitter(url: impl Into<String>) -> Result<DownloadResult>
 /// - Propagates `run_command_in_tempdir` errors.
 #[cfg(feature = "youtube")]
 pub async fn download_youtube(url: impl Into<String>) -> Result<DownloadResult> {
-    let base_args = [
+    let config = global_config();
+    let args = [
         "--no-playlist",
         "-t",
         "mp4",
@@ -172,21 +159,12 @@ pub async fn download_youtube(url: impl Into<String>) -> Result<DownloadResult>
         "-o",
         "%(title)s.%(ext)s",
         "--postprocessor-args",
-        "ffmpeg:-vf setsar=1 -c:v libx264 -crf 20 -preset veryfast -c:a aac -b:a 128k -movflags +faststart",
-    ];
-    let mut args = base_args
+        &config.youtube.postprocessor_args,
+    ]
     .iter()
     .map(ToString::to_string)
-        .collect::<Vec<_>>();
-
-    if let Ok(cookies_path) = env::var("YOUTUBE_SESSION_COOKIE_PATH") {
-        args.extend(["--cookies".into(), cookies_path]);
-    }
-    args.push(url.into());
-
-    let args_ref = args.iter().map(String::as_ref).collect::<Vec<_>>();
-
-    run_command_in_tempdir("yt-dlp", &args_ref).await
+    .collect();
+    run_yt_dlp(args, config.youtube.cookies_path.as_ref(), &url.into()).await
 }
 
 /// Post-process a `DownloadResult`.
@@ -278,6 +256,20 @@ fn is_potential_media_file(path: &Path) -> bool {
         .any(|allowed| allowed.eq_ignore_ascii_case(&ext))
 }
 
+async fn run_yt_dlp(
+    mut args: Vec<String>,
+    cookies_path: Option<&PathBuf>,
+    url: &str,
+) -> Result<DownloadResult> {
+    if let Some(path) = cookies_path {
+        args.extend(["--cookies".to_string(), path.to_string_lossy().to_string()]);
+    }
+    args.push(url.to_string());
+
+    let args_ref = args.iter().map(String::as_ref).collect::<Vec<_>>();
+    run_command_in_tempdir("yt-dlp", &args_ref).await
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/lib.rs

@@ -1,5 +1,6 @@
 pub mod commands;
 pub mod comments;
+pub mod config;
 pub mod download;
 pub mod error;
 pub mod handler;

src/main.rs

@@ -1,7 +1,7 @@
 use dotenv::dotenv;
 use teloxide::{prelude::*, respond};
 use tg_relay_rs::{
-    comments::{Comments, init_global_comments},
+    comments::Comments,
     handler::{Handler, create_handlers},
     telemetry::setup_logger,
 };
@@ -13,15 +13,15 @@ async fn main() -> color_eyre::Result<()> {
     color_eyre::install().expect("color-eyre install");
     setup_logger();
 
-    let comments = Comments::load_from_file("comments.txt")
+    Comments::load_from_file("comments.txt")
         .await
         .map_err(|e| {
             warn!("failed to laod comments.txt: {}; using dummy comments", e);
             e
         })
-        .unwrap_or_else(|_| Comments::dummy());
-
-    init_global_comments(comments).expect("failed to initialize global comments");
+        .unwrap_or_else(|_| Comments::dummy())
+        .init()
+        .expect("failed to initialize comments");
 
     let bot = Bot::from_env();
     info!("bot starting");

src/utils.rs

@@ -1,5 +1,5 @@
 use crate::{
-    comments::{Comments, global_comments},
+    comments::global_comments,
     error::{Error, Result},
 };
 use capitalize::Capitalize;
@@ -109,18 +109,13 @@ pub async fn send_media_from_path(
     path: PathBuf,
     kind: MediaKind,
 ) -> Result<()> {
-    let caption_opt = global_comments()
-        .map(Comments::build_caption)
-        .filter(|caption| !caption.is_empty());
-
+    let caption = global_comments().build_caption();
     let input = InputFile::file(path);
 
     macro_rules! send_msg {
         ($request_expr:expr) => {{
             let mut request = $request_expr;
-            if let Some(cap) = caption_opt {
-                request = request.caption(cap);
-            }
+            request = request.caption(caption);
             match request.await {
                 Ok(message) => info!(message_id = message.id.to_string(), "{} sent", kind),
                 Err(e) => {