Moved IO traits into platform module

1 files changed, 172 insertions, 0 deletions

diff --git a/src/platform/dummy/tun.rs b/src/platform/dummy/tun.rs
new file mode 100644
index 0000000..9fe9480
--- /dev/null
+++ b/src/platform/dummy/tun.rs
@@ -0,0 +1,172 @@
+use std::error::Error;
+use std::fmt;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::mpsc::{sync_channel, Receiver, SyncSender};
+use std::sync::Arc;
+use std::sync::Mutex;
+
+use super::super::tun::*;
+
+/* This submodule provides pure/dummy implementations of the IO interfaces
+ * for use in unit tests thoughout the project.
+ */
+
+/* Error implementation */
+
+#[derive(Debug)]
+pub enum BindError {
+    Disconnected,
+}
+
+impl Error for BindError {
+    fn description(&self) -> &str {
+        "Generic Bind Error"
+    }
+
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        None
+    }
+}
+
+impl fmt::Display for BindError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            BindError::Disconnected => write!(f, "PairBind disconnected"),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum TunError {
+    Disconnected,
+}
+
+impl Error for TunError {
+    fn description(&self) -> &str {
+        "Generic Tun Error"
+    }
+
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        None
+    }
+}
+
+impl fmt::Display for TunError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Not Possible")
+    }
+}
+
+pub struct TunTest {}
+
+pub struct TunFakeIO {
+    store: bool,
+    tx: SyncSender<Vec<u8>>,
+    rx: Receiver<Vec<u8>>,
+}
+
+pub struct TunReader {
+    rx: Receiver<Vec<u8>>,
+}
+
+pub struct TunWriter {
+    store: bool,
+    tx: Mutex<SyncSender<Vec<u8>>>,
+}
+
+#[derive(Clone)]
+pub struct TunMTU {
+    mtu: Arc<AtomicUsize>,
+}
+
+impl Reader for TunReader {
+    type Error = TunError;
+
+    fn read(&self, buf: &mut [u8], offset: usize) -> Result<usize, Self::Error> {
+        match self.rx.recv() {
+            Ok(m) => {
+                buf[offset..].copy_from_slice(&m[..]);
+                Ok(m.len())
+            }
+            Err(_) => Err(TunError::Disconnected),
+        }
+    }
+}
+
+impl Writer for TunWriter {
+    type Error = TunError;
+
+    fn write(&self, src: &[u8]) -> Result<(), Self::Error> {
+        if self.store {
+            let m = src.to_owned();
+            match self.tx.lock().unwrap().send(m) {
+                Ok(_) => Ok(()),
+                Err(_) => Err(TunError::Disconnected),
+            }
+        } else {
+            Ok(())
+        }
+    }
+}
+
+impl MTU for TunMTU {
+    fn mtu(&self) -> usize {
+        self.mtu.load(Ordering::Acquire)
+    }
+}
+
+impl Tun for TunTest {
+    type Writer = TunWriter;
+    type Reader = TunReader;
+    type MTU = TunMTU;
+    type Error = TunError;
+}
+
+impl TunFakeIO {
+    pub fn write(&self, msg: Vec<u8>) {
+        if self.store {
+            self.tx.send(msg).unwrap();
+        }
+    }
+
+    pub fn read(&self) -> Vec<u8> {
+        self.rx.recv().unwrap()
+    }
+}
+
+impl TunTest {
+    pub fn create(mtu: usize, store: bool) -> (TunFakeIO, TunReader, TunWriter, TunMTU) {
+        let (tx1, rx1) = if store {
+            sync_channel(32)
+        } else {
+            sync_channel(1)
+        };
+        let (tx2, rx2) = if store {
+            sync_channel(32)
+        } else {
+            sync_channel(1)
+        };
+
+        let fake = TunFakeIO {
+            tx: tx1,
+            rx: rx2,
+            store,
+        };
+        let reader = TunReader { rx: rx1 };
+        let writer = TunWriter {
+            tx: Mutex::new(tx2),
+            store,
+        };
+        let mtu = TunMTU {
+            mtu: Arc::new(AtomicUsize::new(mtu)),
+        };
+
+        (fake, reader, writer, mtu)
+    }
+}
+
+impl Platform for TunTest {
+    fn create(_name: &str) -> Result<(Vec<Self::Reader>, Self::Writer, Self::MTU), Self::Error> {
+        Err(TunError::Disconnected)
+    }
+}