Wasm improvements for the bindings

This patch improves the Wasm support of the matrix-sdk-ffi crate.

First a uniffi feature needed to be enabled.
Secondly a bunch of methods which don't work under Wasm have been stubbed out.

Signed-off-by: MTRNord <MTRNord@users.noreply.github.com>
Co-authored-by: MTRNord <MTRNord@users.noreply.github.com>

bindings/matrix-sdk-ffi/Cargo.toml

@@ -89,7 +89,8 @@ oauth2.workspace = true
 [target.'cfg(target_family = "wasm")'.dependencies]
 console_error_panic_hook = "0.1.7"
 tokio = { workspace = true, features = ["sync", "macros"] }
-uniffi.workspace = true
+uniffi = { workspace = true, features = ["wasm-unstable-single-threaded"] }
+futures-executor.workspace = true
 
 [target.'cfg(not(target_family = "wasm"))'.dependencies]
 async-compat.workspace = true

bindings/matrix-sdk-ffi/src/client.rs

@@ -1016,7 +1016,6 @@ impl Client {
     }
 }
 
-#[cfg(not(target_family = "wasm"))]
 #[matrix_sdk_ffi_macros::export]
 impl Client {
     /// Retrieves a media file from the media source
@@ -1030,22 +1029,60 @@ impl Client {
         use_cache: bool,
         temp_dir: Option<String>,
     ) -> Result<Arc<MediaFileHandle>, ClientError> {
-        let source = (*media_source).clone();
-        let mime_type: mime::Mime = mime_type.parse()?;
+        #[cfg(not(target_family = "wasm"))]
+        {
+            let source = (*media_source).clone();
+            let mime_type: mime::Mime = mime_type.parse()?;
 
-        let handle = self
-            .inner
-            .media()
-            .get_media_file(
-                &MediaRequestParameters { source: source.media_source, format: MediaFormat::File },
-                filename,
-                &mime_type,
-                use_cache,
-                temp_dir,
-            )
-            .await?;
+            let handle = self
+                .inner
+                .media()
+                .get_media_file(
+                    &MediaRequestParameters {
+                        source: source.media_source,
+                        format: MediaFormat::File,
+                    },
+                    filename,
+                    &mime_type,
+                    use_cache,
+                    temp_dir,
+                )
+                .await?;
 
-        Ok(Arc::new(MediaFileHandle::new(handle)))
+            Ok(Arc::new(MediaFileHandle::new(handle)))
+        }
+
+        /// MediaFileHandle uses SdkMediaFileHandle which requires an
+        /// intermediate TempFile which is not available on wasm
+        /// platforms due to lack of an accessible file system.
+        #[cfg(target_family = "wasm")]
+        Err(ClientError::Generic {
+            msg: "get_media_file is not supported on wasm platforms".to_owned(),
+            details: None,
+        })
+    }
+
+    pub async fn set_display_name(&self, name: String) -> Result<(), ClientError> {
+        #[cfg(not(target_family = "wasm"))]
+        {
+            self.inner
+                .account()
+                .set_display_name(Some(name.as_str()))
+                .await
+                .context("Unable to set display name")?;
+        }
+
+        #[cfg(target_family = "wasm")]
+        {
+            self.inner.account().set_display_name(Some(name.as_str())).await.map_err(|e| {
+                ClientError::Generic {
+                    msg: "Unable to set display name".to_owned(),
+                    details: Some(e.to_string()),
+                }
+            })?;
+        }
+
+        Ok(())
     }
 }
 
@@ -1181,15 +1218,6 @@ impl Client {
         Ok(display_name)
     }
 
-    pub async fn set_display_name(&self, name: String) -> Result<(), ClientError> {
-        self.inner
-            .account()
-            .set_display_name(Some(name.as_str()))
-            .await
-            .context("Unable to set display name")?;
-        Ok(())
-    }
-
     pub async fn upload_avatar(&self, mime_type: String, data: Vec<u8>) -> Result<(), ClientError> {
         let mime: Mime = mime_type.parse()?;
         self.inner.account().upload_avatar(&mime, data).await?;
@@ -2541,25 +2569,25 @@ fn gen_transaction_id() -> String {
 
 /// A file handle that takes ownership of a media file on disk. When the handle
 /// is dropped, the file will be removed from the disk.
-#[cfg(not(target_family = "wasm"))]
 #[derive(uniffi::Object)]
 pub struct MediaFileHandle {
+    #[cfg(not(target_family = "wasm"))]
     inner: std::sync::RwLock<Option<SdkMediaFileHandle>>,
 }
 
-#[cfg(not(target_family = "wasm"))]
 impl MediaFileHandle {
+    #[cfg(not(target_family = "wasm"))]
     fn new(handle: SdkMediaFileHandle) -> Self {
         Self { inner: std::sync::RwLock::new(Some(handle)) }
     }
 }
 
-#[cfg(not(target_family = "wasm"))]
 #[matrix_sdk_ffi_macros::export]
 impl MediaFileHandle {
     /// Get the media file's path.
     pub fn path(&self) -> Result<String, ClientError> {
-        Ok(self
+        #[cfg(not(target_family = "wasm"))]
+        return Ok(self
             .inner
             .read()
             .unwrap()
@@ -2568,24 +2596,37 @@ impl MediaFileHandle {
             .path()
             .to_str()
             .unwrap()
-            .to_owned())
+            .to_owned());
+        #[cfg(target_family = "wasm")]
+        Err(ClientError::Generic {
+            msg: "MediaFileHandle.path() is not supported on WASM targets".to_string(),
+            details: None,
+        })
     }
 
     pub fn persist(&self, path: String) -> Result<bool, ClientError> {
-        let mut guard = self.inner.write().unwrap();
-        Ok(
-            match guard
-                .take()
-                .context("MediaFileHandle was already persisted")?
-                .persist(path.as_ref())
-            {
-                Ok(_) => true,
-                Err(e) => {
-                    *guard = Some(e.file);
-                    false
-                }
-            },
-        )
+        #[cfg(not(target_family = "wasm"))]
+        {
+            let mut guard = self.inner.write().unwrap();
+            Ok(
+                match guard
+                    .take()
+                    .context("MediaFileHandle was already persisted")?
+                    .persist(path.as_ref())
+                {
+                    Ok(_) => true,
+                    Err(e) => {
+                        *guard = Some(e.file);
+                        false
+                    }
+                },
+            )
+        }
+        #[cfg(target_family = "wasm")]
+        Err(ClientError::Generic {
+            msg: "MediaFileHandle.persist() is not supported on WASM targets".to_string(),
+            details: None,
+        })
     }
 }
 

bindings/matrix-sdk-ffi/src/client_builder.rs

@@ -152,15 +152,20 @@ impl ClientBuilder {
             system_is_memory_constrained: false,
             username: None,
             homeserver_cfg: None,
+            #[cfg(not(target_family = "wasm"))]
             user_agent: None,
             sliding_sync_version_builder: SlidingSyncVersionBuilder::None,
+            #[cfg(not(target_family = "wasm"))]
             proxy: None,
+            #[cfg(not(target_family = "wasm"))]
             disable_ssl_verification: false,
             disable_automatic_token_refresh: false,
             cross_process_store_locks_holder_name: None,
             enable_oidc_refresh_lock: false,
             session_delegate: None,
+            #[cfg(not(target_family = "wasm"))]
             additional_root_certificates: Default::default(),
+            #[cfg(not(target_family = "wasm"))]
             disable_built_in_root_certificates: false,
             encryption_settings: EncryptionSettings {
                 auto_enable_cross_signing: false,
@@ -559,18 +564,23 @@ impl ClientBuilder {
     }
 }
 
-#[cfg(not(target_family = "wasm"))]
 #[matrix_sdk_ffi_macros::export]
 impl ClientBuilder {
     pub fn proxy(self: Arc<Self>, url: String) -> Arc<Self> {
         let mut builder = unwrap_or_clone_arc(self);
-        builder.proxy = Some(url);
+        #[cfg(not(target_family = "wasm"))]
+        {
+            builder.proxy = Some(url);
+        }
         Arc::new(builder)
     }
 
     pub fn disable_ssl_verification(self: Arc<Self>) -> Arc<Self> {
         let mut builder = unwrap_or_clone_arc(self);
-        builder.disable_ssl_verification = true;
+        #[cfg(not(target_family = "wasm"))]
+        {
+            builder.disable_ssl_verification = true;
+        }
         Arc::new(builder)
     }
 
@@ -579,7 +589,11 @@ impl ClientBuilder {
         certificates: Vec<CertificateBytes>,
     ) -> Arc<Self> {
         let mut builder = unwrap_or_clone_arc(self);
-        builder.additional_root_certificates = certificates;
+
+        #[cfg(not(target_family = "wasm"))]
+        {
+            builder.additional_root_certificates = certificates;
+        }
 
         Arc::new(builder)
     }
@@ -589,13 +603,19 @@ impl ClientBuilder {
     /// [`add_root_certificates`][ClientBuilder::add_root_certificates].
     pub fn disable_built_in_root_certificates(self: Arc<Self>) -> Arc<Self> {
         let mut builder = unwrap_or_clone_arc(self);
-        builder.disable_built_in_root_certificates = true;
+        #[cfg(not(target_family = "wasm"))]
+        {
+            builder.disable_built_in_root_certificates = true;
+        }
         Arc::new(builder)
     }
 
     pub fn user_agent(self: Arc<Self>, user_agent: String) -> Arc<Self> {
         let mut builder = unwrap_or_clone_arc(self);
-        builder.user_agent = Some(user_agent);
+        #[cfg(not(target_family = "wasm"))]
+        {
+            builder.user_agent = Some(user_agent);
+        }
         Arc::new(builder)
     }
 }