Started working on attachment store

kordophone/src/api/mod.rs

@@ -1,7 +1,8 @@
+pub use crate::model::{Conversation, ConversationID, Message, MessageID, OutgoingMessage};
+
 use async_trait::async_trait;
-pub use crate::model::{
-    Conversation, Message, ConversationID, MessageID, OutgoingMessage,
-};
+use bytes::Bytes;
+use futures_util::Stream;
 
 pub mod auth;
 pub use crate::api::auth::{AuthenticationStore, InMemoryAuthenticationStore};
@@ -15,21 +16,23 @@ pub mod event_socket;
 pub use event_socket::EventSocket;
 
 use self::http_client::Credentials;
-use std::fmt::Debug;
+use core::error::Error as StdError;
+use std::{fmt::Debug, io::BufRead};
 
 #[async_trait]
 pub trait APIInterface {
     type Error: Debug;
+    type ResponseStream: Stream<Item = Result<Bytes, Self::Error>>;
 
     // (GET) /version
     async fn get_version(&mut self) -> Result<String, Self::Error>;
-    
+
     // (GET) /conversations
     async fn get_conversations(&mut self) -> Result<Vec<Conversation>, Self::Error>;
 
     // (GET) /messages
     async fn get_messages(
-        &mut self, 
+        &mut self,
         conversation_id: &ConversationID,
         limit: Option<u32>,
         before: Option<MessageID>,
@@ -38,13 +41,22 @@ pub trait APIInterface {
 
     // (POST) /sendMessage
     async fn send_message(
-        &mut self, 
+        &mut self,
         outgoing_message: &OutgoingMessage,
     ) -> Result<Message, Self::Error>;
 
+    // (GET) /attachment
+    async fn fetch_attachment_data(
+        &mut self,
+        guid: &String,
+    ) -> Result<Self::ResponseStream, Self::Error>;
+
     // (POST) /authenticate
     async fn authenticate(&mut self, credentials: Credentials) -> Result<JwtToken, Self::Error>;
 
     // (WS) /updates
-    async fn open_event_socket(&mut self, update_seq: Option<u64>) -> Result<impl EventSocket, Self::Error>;
+    async fn open_event_socket(
+        &mut self,
+        update_seq: Option<u64>,
+    ) -> Result<impl EventSocket, Self::Error>;
 }