daemon: implements post office

kordophone/src/model/outgoing_message.rs

@@ -1,8 +1,12 @@
 use serde::Serialize;
 use super::conversation::ConversationID;
+use uuid::Uuid;
 
 #[derive(Debug, Clone, Serialize)]
 pub struct OutgoingMessage {
+    #[serde(skip)]
+    pub guid: Uuid,
+
     #[serde(rename = "body")]
     pub text: String,
 
@@ -21,6 +25,7 @@ impl OutgoingMessage {
 
 #[derive(Default)]
 pub struct OutgoingMessageBuilder {
+    guid: Option<Uuid>,
     text: Option<String>,
     conversation_id: Option<ConversationID>,
     file_transfer_guids: Option<Vec<String>>,
@@ -31,6 +36,11 @@ impl OutgoingMessageBuilder {
         Self::default()
     }
 
+    pub fn guid(mut self, guid: Uuid) -> Self {
+        self.guid = Some(guid);
+        self
+    }
+
     pub fn text(mut self, text: String) -> Self {
         self.text = Some(text);
         self
@@ -48,6 +58,7 @@ impl OutgoingMessageBuilder {
 
     pub fn build(self) -> OutgoingMessage {
         OutgoingMessage { 
+            guid: self.guid.unwrap_or_else(|| Uuid::new_v4()),
             text: self.text.unwrap(), 
             conversation_id: self.conversation_id.unwrap(), 
             file_transfer_guids: self.file_transfer_guids.unwrap_or_default(),