Accessible msg error and type changes

src/message.rs

@@ -265,7 +265,7 @@ pub struct Message {
     pub(crate) is_dc_message: MessengerMessage,
     pub(crate) chat_blocked: Blocked,
     pub(crate) location_id: u32,
-    pub(crate) error: String,
+    error: Option<String>,
     pub(crate) param: Params,
 }
 
@@ -331,7 +331,8 @@ impl Message {
                     msg.ephemeral_timestamp = row.get("ephemeral_timestamp")?;
                     msg.viewtype = row.get("type")?;
                     msg.state = row.get("state")?;
-                    msg.error = row.get("error")?;
+                    let error: String = row.get("error")?;
+                    msg.error = Some(error).filter(|error| !error.is_empty());
                     msg.is_dc_message = row.get("msgrmsg")?;
 
                     let text;
@@ -750,6 +751,22 @@ impl Message {
             .await
             .is_ok()
     }
+
+    /// Gets the error status of the message.
+    ///
+    /// A message can have an associated error status if something went wrong when sending or
+    /// receiving message itself.  The error status is free-form text and should not be further parsed,
+    /// rather it's presence is meant to indicate *something* went wrong with the message and the
+    /// text of the error is detailed information on what.
+    ///
+    /// Some common reasons error can be associated with messages are:
+    /// * Lack of valid signature on an e2ee message, usually for received messages.
+    /// * Failure to decrypt an e2ee message, usually for received messages.
+    /// * When a message could not be delivered to one or more recipients the non-delivery
+    ///    notification text can be stored in the error status.
+    pub fn error(&self) -> Option<String> {
+        self.error.clone()
+    }
 }
 
 #[derive(
@@ -1044,8 +1061,8 @@ pub async fn get_msg_info(context: &Context, msg_id: MsgId) -> String {
 
     ret += "\n";
 
-    if !msg.error.is_empty() {
-        ret += &format!("Error: {}", msg.error);
+    if let Some(error) = msg.error.as_ref() {
+        ret += &format!("Error: {}", error);
     }
 
     if let Some(path) = msg.get_file(context) {