Re-send pending messages after reconnecting

zrpc/proto/zed.proto

@@ -151,6 +151,7 @@ message GetUsersResponse {
 message SendChannelMessage {
     uint64 channel_id = 1;
     string body = 2;
+    Nonce nonce = 3;
 }
 
 message SendChannelMessageResponse {
@@ -296,6 +297,11 @@ message Range {
     uint64 end = 2;
 }
 
+message Nonce {
+    uint64 upper_half = 1;
+    uint64 lower_half = 2;
+}
+
 message Channel {
     uint64 id = 1;
     string name = 2;
@@ -306,4 +312,5 @@ message ChannelMessage {
     string body = 2;
     uint64 timestamp = 3;
     uint64 sender_id = 4;
+    Nonce nonce = 5;
 }

zrpc/src/proto.rs

@@ -248,3 +248,22 @@ impl From<SystemTime> for Timestamp {
         }
     }
 }
+
+impl From<u128> for Nonce {
+    fn from(nonce: u128) -> Self {
+        let upper_half = (nonce >> 64) as u64;
+        let lower_half = nonce as u64;
+        Self {
+            upper_half,
+            lower_half,
+        }
+    }
+}
+
+impl From<Nonce> for u128 {
+    fn from(nonce: Nonce) -> Self {
+        let upper_half = (nonce.upper_half as u128) << 64;
+        let lower_half = nonce.lower_half as u128;
+        upper_half | lower_half
+    }
+}