feat(friends): add friends module

Author: kurnevsky

src/toxcore/dht/server/mod.rs

@@ -1492,6 +1492,12 @@ mod tests {
     const ONION_RETURN_2_PAYLOAD_SIZE: usize = ONION_RETURN_2_SIZE - secretbox::NONCEBYTES;
     const ONION_RETURN_3_PAYLOAD_SIZE: usize = ONION_RETURN_3_SIZE - secretbox::NONCEBYTES;
 
+    impl Server {
+        pub fn has_friend(&self, pk: &PublicKey) -> bool {
+            self.friends.read().contains_key(pk)
+        }
+    }
+
     fn create_node() -> (Server, PrecomputedKey, PublicKey, SecretKey,
             mpsc::Receiver<(Packet, SocketAddr)>, SocketAddr) {
         crypto_init().unwrap();

src/toxcore/friend_connection/errors.rs

@@ -0,0 +1,57 @@
+//! Errors for friend connections module.
+
+use failure::Fail;
+
+error_kind! {
+    #[doc = "Error that can happen while removing a friend"]
+    #[derive(Debug)]
+    RemoveFriendError,
+    #[doc = "The specific kind of error that can occur."]
+    #[derive(Debug, Eq, PartialEq, Fail)]
+    RemoveFriendErrorKind {
+        #[doc = "Failed to kill net_crypto connection."]
+        #[fail(display = "Failed to kill net_crypto connection")]
+        KillConnection,
+        #[doc = "There is no such friend."]
+        #[fail(display = "There is no such friend")]
+        NoFriend,
+    }
+}
+
+error_kind! {
+    #[doc = "Error that can happen while removing a frind"]
+    #[derive(Debug)]
+    RunError,
+    #[doc = "The specific kind of error that can occur."]
+    #[derive(Debug, Eq, PartialEq, Fail)]
+    RunErrorKind {
+        #[doc = "Wakeup timer error."]
+        #[fail(display = "Wakeup timer error")]
+        Wakeup,
+        #[doc = "Failed to kill net_crypto connection."]
+        #[fail(display = "Failed to kill net_crypto connection")]
+        KillConnection,
+        #[doc = "Failed to send packet."]
+        #[fail(display = "Failed to send packet")]
+        SendTo,
+        #[doc = "Failed to add TCP connection."]
+        #[fail(display = "Failed to TCP connection")]
+        AddTcpConnection,
+        #[doc = "Failed to send connection status."]
+        #[fail(display = "Failed to send connection status")]
+        SendToConnectionStatus
+    }
+}
+
+error_kind! {
+    #[doc = "Error that can happen while handling `ShareRelays` packet."]
+    #[derive(Debug)]
+    HandleShareRelaysError,
+    #[doc = "The specific kind of error that can occur."]
+    #[derive(Debug, Eq, PartialEq, Fail)]
+    HandleShareRelaysErrorKind {
+        #[doc = "Failed to add TCP connection."]
+        #[fail(display = "Failed to TCP connection")]
+        AddTcpConnection
+    }
+}