Fix README links

[netwatcher] / src / watch_mac.rs

diff --git a/src/watch_mac.rs b/src/watch_mac.rs
index ed2879c6feff85a0c57c5fb9c08c3f2e48068df3..c44169cf25a28b9fc937ecafd3865bc2e76bba35 100644 (file)
--- a/src/watch_mac.rs
+++ b/src/watch_mac.rs
@@ -1,48 +1,91 @@
-use crate::Update;
+use std::sync::Mutex;
+
+use block2::{Block, RcBlock};
+use objc2::Encoding;
+
+use crate::{Error, List, Update};
 
 // The "objc2" project aims to provide bindings for all frameworks but Network.framework
 // isn't ready yet so let's kick it old-school
 
-struct nw_path_monitor;
-type nw_path_monitor_t = *mut nw_path_monitor;
-struct nw_path;
-type nw_path_t = *mut nw_path;
-struct dispatch_queue;
-type dispatch_queue_t = *mut dispatch_queue;
+#[repr(C)]
+struct NwPathMonitor([u8; 0]);
+type NwPathMonitorT = *mut NwPathMonitor;
+#[repr(C)]
+struct NwPath([u8; 0]);
+#[repr(C)]
+struct DispatchQueue([u8; 0]);
+type DispatchQueueT = *mut DispatchQueue;
 const QOS_CLASS_BACKGROUND: usize = 0x09;
 
+unsafe impl objc2::Encode for NwPath {
+    const ENCODING: Encoding = usize::ENCODING;
+}
+
+unsafe impl Send for WatchHandle {}
+
 #[link(name = "Network", kind = "framework")]
 extern "C" {
-    fn nw_path_monitor_create() -> nw_path_monitor_t;
+    fn nw_path_monitor_create() -> NwPathMonitorT;
     fn nw_path_monitor_set_update_handler(
-        monitor: nw_path_monitor_t,
-        update_handler: &Block<dyn Fn(nw_path_t)>,
+        monitor: NwPathMonitorT,
+        update_handler: &Block<dyn Fn(NwPath)>,
     );
-    fn nw_path_monitor_set_queue(monitor: nw_path_monitor_t, queue: dispatch_queue_t);
-    fn nw_path_monitor_start(monitor: nw_path_monitor_t);
-    fn nw_path_monitor_cancel(monitor: nw_path_monitor_t);
+    fn nw_path_monitor_set_queue(monitor: NwPathMonitorT, queue: DispatchQueueT);
+    fn nw_path_monitor_start(monitor: NwPathMonitorT);
+    fn nw_path_monitor_cancel(monitor: NwPathMonitorT);
 
-    fn dispatch_get_global_queue(identifier: usize, flag: usize) -> dispatch_queue_t;
+    fn dispatch_get_global_queue(identifier: usize, flag: usize) -> DispatchQueueT;
 }
 
-#[cfg(test)]
-mod test {
-    use super::list_interfaces;
+pub(crate) struct WatchHandle {
+    path_monitor: NwPathMonitorT,
+}
 
-    #[test]
-    fn list() {
-        let ifaces = list_interfaces().unwrap();
-        println!("{:?}", ifaces);
+impl Drop for WatchHandle {
+    fn drop(&mut self) {
+        unsafe {
+            nw_path_monitor_cancel(self.path_monitor);
+        }
     }
 }
 
-pub(crate) struct WatchHandle;
+struct CallbackState {
+    prev_list: List,
+    callback: Box<dyn FnMut(Update) + Send + 'static>,
+}
 
-pub(crate) fn watch_interfaces<F: FnMut(Update) + 'static>(
+pub(crate) fn watch_interfaces<F: FnMut(Update) + Send + 'static>(
     callback: F,
 ) -> Result<WatchHandle, Error> {
-    // stop current worker thread
-    // post this into a thread that will use it
-    drop(callback);
-    Ok(WatchHandle)
+    let state = CallbackState {
+        prev_list: List::default(),
+        callback: Box::new(callback),
+    };
+    // Blocks are Fn, not FnMut
+    let state = Mutex::new(state);
+    let block = RcBlock::new(move |_: NwPath| {
+        let mut state = state.lock().unwrap();
+        let Ok(new_list) = crate::list::list_interfaces() else {
+            return;
+        };
+        if new_list == state.prev_list {
+            return;
+        }
+        let update = Update {
+            interfaces: new_list.0.clone(),
+            diff: new_list.diff_from(&state.prev_list),
+        };
+        (state.callback)(update);
+        state.prev_list = new_list;
+    });
+    let path_monitor: NwPathMonitorT;
+    unsafe {
+        let queue = dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0);
+        path_monitor = nw_path_monitor_create();
+        nw_path_monitor_set_update_handler(path_monitor, &block);
+        nw_path_monitor_set_queue(path_monitor, queue);
+        nw_path_monitor_start(path_monitor);
+    }
+    Ok(WatchHandle { path_monitor })
 }