Add 1:1 Chats using Groups (#139)

* Add Identified Trait for convo

* Add PrivateV2Convo

* Rename to DirectV1

* Rename ConvoTypeOwned variant

* Update DirectV1 to support multiple members

* Apply suggestion from @kaichaosun

Co-authored-by: kaichao <kaichaosuna@gmail.com>

---------

Co-authored-by: kaichao <kaichaosuna@gmail.com>

core/conversations/src/conversation.rs

@@ -1,3 +1,4 @@
+mod direct_v1;
 pub mod group_v1;
 mod group_v2;
 mod privatev1;
@@ -6,6 +7,7 @@ pub use crate::errors::ChatError;
 use crate::outcomes::ConvoOutcome;
 use crate::proto::EncryptedPayload;
 use crate::service_context::{ExternalServices, ServiceContext};
+pub use direct_v1::DirectV1Convo;
 pub use group_v1::GroupV1Convo;
 pub use group_v2::GroupV2Convo;
 pub use privatev1::PrivateV1Convo;
@@ -15,7 +17,7 @@ pub type ConversationId = String;
 pub type ConversationIdRef<'a> = &'a str;
 
 /// Behaviour shared by every conversation kind.
-pub(crate) trait Convo<S: ExternalServices>: Identified {
+pub(crate) trait Convo<S: ExternalServices>: Identified + Send {
     fn send_content(&mut self, cx: &mut ServiceContext<S>, content: &[u8])
     -> Result<(), ChatError>;
 

core/conversations/src/conversation/direct_v1.rs

@@ -0,0 +1,61 @@
+use chat_proto::logoschat::encryption::EncryptedPayload;
+use shared_traits::IdentIdRef;
+
+use crate::{
+    ChatError, ExternalServices,
+    conversation::{ConversationIdRef, Convo, GroupConvo, GroupV1Convo, Identified},
+    service_context::ServiceContext,
+};
+
+type DelegateGroup = GroupV1Convo;
+
+/// A Conversation between two participants.
+#[derive(Debug)]
+pub struct DirectV1Convo {
+    inner_group: DelegateGroup,
+}
+
+impl DirectV1Convo {
+    // Constructor must accept multiple IdentId's
+    // While the conversation is limited to 2 participants, each participants may
+    // have multiple Installations.
+    pub fn new<S: ExternalServices>(
+        cx: &mut ServiceContext<S>,
+        members: &[IdentIdRef],
+    ) -> Result<Self, ChatError> {
+        let mut inner_group = DelegateGroup::new(cx)?;
+        inner_group.add_member(cx, members)?;
+        Ok(Self { inner_group })
+    }
+}
+
+impl Identified for DirectV1Convo {
+    fn id(&self) -> ConversationIdRef<'_> {
+        self.inner_group.id()
+    }
+}
+
+impl<S> Convo<S> for DirectV1Convo
+where
+    S: ExternalServices,
+{
+    fn send_content(
+        &mut self,
+        cx: &mut ServiceContext<S>,
+        content: &[u8],
+    ) -> Result<(), super::ChatError> {
+        self.inner_group.send_content(cx, content)
+    }
+
+    fn handle_frame(
+        &mut self,
+        cx: &mut ServiceContext<S>,
+        enc: EncryptedPayload,
+    ) -> Result<crate::ConvoOutcome, ChatError> {
+        self.inner_group.handle_frame(cx, enc)
+    }
+
+    fn wakeup(&mut self, service_ctx: &mut ServiceContext<S>) -> Result<(), ChatError> {
+        self.inner_group.wakeup(service_ctx)
+    }
+}

core/conversations/src/core.rs

@@ -1,6 +1,6 @@
 use crate::causal_history::{CausalHistoryStore, MissingMessage};
 use crate::conversation::{
-    ConversationIdRef, GroupV1Convo, GroupV2Convo, Identified, PrivateV1Convo,
+    ConversationIdRef, DirectV1Convo, GroupV1Convo, GroupV2Convo, Identified, PrivateV1Convo,
 };
 use crate::service_context::{ExternalServices, ServiceContext};
 use crate::{DeliveryService, IdentityProvider, RegistrationService, WakeupService};
@@ -16,6 +16,7 @@ use crypto::{Identity, PublicKey};
 use openmls::group::GroupId;
 use shared_traits::IdentIdRef;
 use std::collections::HashMap;
+use std::fmt::Debug;
 use storage::{ChatStore, ConversationKind, ConversationStore};
 use tracing::{info, instrument};
 
@@ -188,6 +189,14 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         &mut self,
         remote_bundle: &Introduction,
         content: &[u8],
+    ) -> Result<ConversationId, ChatError> {
+        self.create_private_convo_v1(remote_bundle, content)
+    }
+
+    pub fn create_private_convo_v1(
+        &mut self,
+        remote_bundle: &Introduction,
+        content: &[u8],
     ) -> Result<ConversationId, ChatError> {
         let (mut convo, payloads) =
             self.inbox
@@ -204,6 +213,17 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         Ok(convo_id)
     }
 
+    pub fn create_direct_convo_v1(
+        &mut self,
+        members: &[IdentIdRef],
+    ) -> Result<ConversationId, ChatError> {
+        let convo = DirectV1Convo::new(&mut self.services, members)?;
+        let convo_id = convo.id().to_string();
+        self.register_convo(ConvoTypeOwned::Direct(Box::new(convo)))?;
+
+        Ok(convo_id)
+    }
+
     pub fn create_group_convo(
         &mut self,
         participants: &[IdentIdRef],
@@ -266,6 +286,10 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
                 ConvoTypeOwned::Group(group_convo) => {
                     group_convo.add_member(&mut self.services, members)
                 }
+                ConvoTypeOwned::Direct(convo) => Err(ChatError::UnsupportedFunction(
+                    convo.id().into(),
+                    "Add Member".into(),
+                )),
             }
         } else {
             let mut convo = self.load_group_convo(convo_id)?;
@@ -397,6 +421,7 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         };
         let convo = match convo {
             ConvoTypeOwned::Group(c) => c.as_mut(),
+            ConvoTypeOwned::Direct(c) => c.as_mut(),
         };
 
         convo.wakeup(&mut self.services)
@@ -466,15 +491,24 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
     }
 }
 
-#[derive(Debug)]
 enum ConvoTypeOwned<S: ExternalServices> {
-    // Pairwise(Box<dyn BaseConvo<S>>),
+    Direct(Box<dyn Convo<S>>),
     Group(Box<dyn GroupConvo<S>>),
 }
 
+impl<S: ExternalServices> Debug for ConvoTypeOwned<S> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Direct(arg0) => f.debug_tuple("Pairwise").field(&arg0.id()).finish(),
+            Self::Group(arg0) => f.debug_tuple("Group").field(&arg0.id()).finish(),
+        }
+    }
+}
+
 impl<S: ExternalServices> Identified for ConvoTypeOwned<S> {
     fn id(&self) -> ConversationIdRef<'_> {
         match self {
+            ConvoTypeOwned::Direct(convo) => convo.id(),
             ConvoTypeOwned::Group(group_convo) => group_convo.id(),
         }
     }
@@ -488,6 +522,7 @@ impl<S: ExternalServices> Convo<S> for ConvoTypeOwned<S> {
     ) -> Result<(), ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.send_content(cx, content),
+            ConvoTypeOwned::Direct(convo) => convo.send_content(cx, content),
         }
     }
 
@@ -498,12 +533,14 @@ impl<S: ExternalServices> Convo<S> for ConvoTypeOwned<S> {
     ) -> Result<ConvoOutcome, ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.handle_frame(cx, enc),
+            ConvoTypeOwned::Direct(convo) => convo.handle_frame(cx, enc),
         }
     }
 
     fn wakeup(&mut self, service_ctx: &mut ServiceContext<S>) -> Result<(), ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.wakeup(service_ctx),
+            ConvoTypeOwned::Direct(convo) => convo.wakeup(service_ctx),
         }
     }
 }

core/conversations/src/errors.rs

@@ -4,6 +4,8 @@ pub use thiserror::Error;
 
 use storage::StorageError;
 
+use crate::ConversationId;
+
 #[derive(Error, Debug)]
 pub enum ChatError {
     #[error("protocol error: {0:?}")]
@@ -42,6 +44,9 @@ pub enum ChatError {
     MlsError(#[from] MlsError),
     #[error("demls error: {0}")]
     DeMlsError(#[from] ConversationError),
+    // Used when a core function is called with a convo_id which is unsupported
+    #[error("convo:{0} does not support {1}")]
+    UnsupportedFunction(ConversationId, String),
 }
 
 impl ChatError {