[WASM-2] Put code using fs APIs under their own feature

lib/grammers-client/Cargo.toml

@@ -19,6 +19,8 @@ html = ["html5ever"]
 proxy = ["grammers-mtsender/proxy"]
 parse_invite_link = ["url"]
 serde = ["grammers-tl-types/impl-serde"]
+fs = ["tokio/fs"]
+default = ["fs"]
 
 [dependencies]
 chrono = "0.4.38"
@@ -39,7 +41,6 @@ os_info = { version = "3.8.2", default-features = false }
 pin-project-lite = "0.2"
 pulldown-cmark = { version = "0.12.1", default-features = false, optional = true }
 tokio = { version = "1.40.0", default-features = false, features = [
-    "fs",
     "rt",
 ] }
 url = { version = "2.5.2", optional = true }

lib/grammers-client/src/client/files.rs

@@ -6,27 +6,37 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 use std::future::Future;
+use std::sync::Arc;
 use std::task::Poll;
-use std::{io::SeekFrom, path::Path, sync::Arc};
 
 use futures::{
     stream::{FuturesUnordered, StreamExt},
-    Stream, TryStreamExt,
+    Stream,
 };
-use tokio::sync::mpsc::unbounded_channel;
 use tokio::{
-    fs,
-    io::{self, AsyncRead, AsyncReadExt, AsyncSeekExt, AsyncWriteExt},
+    io::{self, AsyncRead, AsyncReadExt},
     sync::Mutex as AsyncMutex,
 };
 
 use grammers_mtsender::InvocationError;
 use grammers_tl_types as tl;
 
-use crate::types::{photo_sizes::PhotoSize, Downloadable, Media, Uploaded};
+use crate::types::{photo_sizes::PhotoSize, Downloadable, Uploaded};
 use crate::utils::{generate_random_id, poll_future_ready};
 use crate::Client;
 
+#[cfg(feature = "fs")]
+use {
+    crate::types::Media,
+    futures::TryStreamExt,
+    std::{io::SeekFrom, path::Path},
+    tokio::{
+        fs,
+        io::{AsyncSeekExt, AsyncWriteExt},
+        sync::mpsc::unbounded_channel,
+    },
+};
+
 pub const MIN_CHUNK_SIZE: i32 = 4 * 1024;
 pub const MAX_CHUNK_SIZE: i32 = 512 * 1024;
 const FILE_MIGRATE_ERROR: i32 = 303;
@@ -210,6 +220,7 @@ impl Client {
     /// # Ok(())
     /// # }
     /// ```
+    #[cfg(feature = "fs")]
     pub async fn download_media<P: AsRef<Path>>(
         &self,
         downloadable: &Downloadable,
@@ -253,6 +264,7 @@ impl Client {
         Client::load(path, &mut download).await
     }
 
+    #[cfg(feature = "fs")]
     async fn load<P: AsRef<Path>>(path: P, download: &mut DownloadStream) -> Result<(), io::Error> {
         let mut file = fs::File::create(path).await?;
         while let Some(chunk) = download
@@ -267,6 +279,7 @@ impl Client {
     }
 
     /// Downloads a `Document` to specified path using multiple connections
+    #[cfg(feature = "fs")]
     async fn download_media_concurrent<P: AsRef<Path>>(
         &self,
         media: &Media,
@@ -520,6 +533,7 @@ impl Client {
     /// ```
     ///
     /// [`InputMessage`]: crate::InputMessage
+    #[cfg(feature = "fs")]
     pub async fn upload_file<P: AsRef<Path>>(&self, path: P) -> Result<Uploaded, io::Error> {
         let path = path.as_ref();
 

lib/grammers-client/src/types/message.rs

@@ -8,7 +8,7 @@
 #[cfg(any(feature = "markdown", feature = "html"))]
 use crate::parsers;
 use crate::types::reactions::InputReactions;
-use crate::types::{Downloadable, InputMessage, Media, Photo};
+use crate::types::{InputMessage, Media, Photo};
 use crate::ChatMap;
 use crate::{types, Client};
 use crate::{utils, InputMedia};
@@ -17,11 +17,15 @@ use grammers_mtsender::InvocationError;
 use grammers_session::PackedChat;
 use grammers_tl_types as tl;
 use std::fmt;
-use std::io;
-use std::path::Path;
 use std::sync::Arc;
 use types::Chat;
 
+#[cfg(feature = "fs")]
+use {
+    crate::types::Downloadable,
+    std::{io, path::Path},
+};
+
 pub(crate) const EMPTY_MESSAGE: tl::types::Message = tl::types::Message {
     out: false,
     mentioned: false,
@@ -674,6 +678,7 @@ impl Message {
     /// Returns `true` if there was media to download, or `false` otherwise.
     ///
     /// Shorthand for `Client::download_media`.
+    #[cfg(feature = "fs")]
     pub async fn download_media<P: AsRef<Path>>(&self, path: P) -> Result<bool, io::Error> {
         // TODO probably encode failed download in error
         if let Some(media) = self.media() {