feat: wire with the double ratchet storage

conversations/src/context.rs

@@ -1,9 +1,10 @@
 use std::rc::Rc;
 
+use double_ratchets::{RatchetState, RatchetStorage};
 use storage::StorageConfig;
 
 use crate::{
-    conversation::{ConversationId, ConversationStore, Convo, Id},
+    conversation::{ConversationId, ConversationStore, Convo, Id, PrivateV1Convo},
     errors::ChatError,
     identity::Identity,
     inbox::Inbox,
@@ -22,6 +23,7 @@ pub struct Context {
     store: ConversationStore,
     inbox: Inbox,
     storage: ChatStorage,
+    ratchet_storage: RatchetStorage,
 }
 
 impl Context {
@@ -30,7 +32,8 @@ impl Context {
     /// If an identity exists in storage, it will be restored.
     /// Otherwise, a new identity will be created with the given name and saved.
     pub fn open(name: impl Into<String>, config: StorageConfig) -> Result<Self, ChatError> {
-        let mut storage = ChatStorage::new(config)?;
+        let mut storage = ChatStorage::new(config.clone())?;
+        let ratchet_storage = RatchetStorage::from_config(config)?;
         let name = name.into();
 
         // Load or create identity
@@ -45,11 +48,31 @@ impl Context {
         let identity = Rc::new(identity);
         let inbox = Inbox::new(Rc::clone(&identity));
 
+        // Restore persisted conversations
+        let mut store = ConversationStore::new();
+        let conversation_records = storage.load_conversations()?;
+        for record in conversation_records {
+            let convo: Box<dyn Convo> = match record.convo_type.as_str() {
+                "private_v1" => {
+                    let dr_state: RatchetState =
+                        ratchet_storage.load(&record.local_convo_id)?;
+                    Box::new(PrivateV1Convo::from_stored(
+                        record.local_convo_id,
+                        record.remote_convo_id,
+                        dr_state,
+                    ))
+                }
+                _ => continue, // Skip unknown conversation types
+            };
+            store.insert_convo(convo);
+        }
+
         Ok(Self {
             _identity: identity,
-            store: ConversationStore::new(),
+            store,
             inbox,
             storage,
+            ratchet_storage,
         })
     }
 
@@ -93,16 +116,18 @@ impl Context {
         convo_id: ConversationId,
         content: &[u8],
     ) -> Result<Vec<AddressedEnvelope>, ChatError> {
-        // Lookup convo by id
-        let convo = self.get_convo_mut(convo_id)?;
+        let convo = self
+            .store
+            .get_mut(convo_id)
+            .ok_or_else(|| ChatError::NoConvo(convo_id.into()))?;
 
-        // Generate encrypted payloads
         let payloads = convo.send_message(content)?;
+        let remote_id = convo.remote_id();
+        convo.save_ratchet_state(&mut self.ratchet_storage)?;
 
-        // Attach conversation_ids to Envelopes
         Ok(payloads
             .into_iter()
-            .map(|p| p.into_envelope(convo.remote_id()))
+            .map(|p| p.into_envelope(remote_id.clone()))
             .collect())
     }
 
@@ -151,7 +176,12 @@ impl Context {
             return Err(ChatError::Protocol("convo id not found".into()));
         };
 
-        convo.handle_frame(enc_payload)
+        let result = convo.handle_frame(enc_payload)?;
+
+        // Persist updated ratchet state
+        convo.save_ratchet_state(&mut self.ratchet_storage)?;
+
+        Ok(result)
     }
 
     pub fn create_intro_bundle(&mut self) -> Result<Vec<u8>, ChatError> {
@@ -162,21 +192,16 @@ impl Context {
     }
 
     fn add_convo(&mut self, convo: Box<dyn Convo>) -> ConversationIdOwned {
-        // Persist conversation metadata to storage
+        // Persist conversation metadata and ratchet state
         let _ = self.storage.save_conversation(
             convo.id(),
             &convo.remote_id(),
             convo.convo_type(),
         );
+        let _ = convo.save_ratchet_state(&mut self.ratchet_storage);
         self.store.insert_convo(convo)
     }
 
-    // Returns a mutable reference to a Convo for a given ConvoId
-    fn get_convo_mut(&mut self, convo_id: ConversationId) -> Result<&mut dyn Convo, ChatError> {
-        self.store
-            .get_mut(convo_id)
-            .ok_or_else(|| ChatError::NoConvo(convo_id.into()))
-    }
 }
 
 #[cfg(test)]
@@ -247,7 +272,6 @@ mod tests {
 
     #[test]
     fn identity_persistence() {
-        // Use file-based storage to test real persistence
         let dir = tempfile::tempdir().unwrap();
         let db_path = dir
             .path()
@@ -256,18 +280,15 @@ mod tests {
             .to_string();
         let config = StorageConfig::File(db_path);
 
-        // Create context - this should create and save a new identity
         let ctx1 = Context::open("alice", config.clone()).unwrap();
         let pubkey1 = ctx1._identity.public_key();
         let name1 = ctx1.installation_name().to_string();
 
-        // Drop and reopen - should load the same identity
         drop(ctx1);
         let ctx2 = Context::open("alice", config).unwrap();
         let pubkey2 = ctx2._identity.public_key();
         let name2 = ctx2.installation_name().to_string();
 
-        // Identity should be the same
         assert_eq!(pubkey1, pubkey2, "public key should persist");
         assert_eq!(name1, name2, "name should persist");
     }
@@ -282,20 +303,16 @@ mod tests {
             .to_string();
         let config = StorageConfig::File(db_path);
 
-        // Create context and generate an intro bundle (creates ephemeral key)
         let mut ctx1 = Context::open("alice", config.clone()).unwrap();
         let bundle1 = ctx1.create_intro_bundle().unwrap();
 
-        // Drop and reopen - ephemeral keys should be restored from db
         drop(ctx1);
         let mut ctx2 = Context::open("alice", config.clone()).unwrap();
 
-        // Use the intro bundle from before restart to start a conversation
         let intro = Introduction::try_from(bundle1.as_slice()).unwrap();
         let mut bob = Context::new_with_name("bob");
         let (_, payloads) = bob.create_private_convo(&intro, b"hello after restart");
 
-        // Alice (ctx2) should be able to handle the payload using the persisted ephemeral key
         let payload = payloads.first().unwrap();
         let content = ctx2
             .handle_payload(&payload.data)
@@ -315,7 +332,6 @@ mod tests {
             .to_string();
         let config = StorageConfig::File(db_path);
 
-        // Create context, establish a conversation
         let mut alice = Context::open("alice", config.clone()).unwrap();
         let mut bob = Context::new_with_name("bob");
 
@@ -327,17 +343,73 @@ mod tests {
         let content = alice.handle_payload(&payload.data).unwrap().unwrap();
         assert!(content.is_new_convo);
 
-        // Verify conversation metadata was persisted
         let convos = alice.storage.load_conversations().unwrap();
         assert_eq!(convos.len(), 1);
         assert_eq!(convos[0].convo_type, "private_v1");
-        assert!(!convos[0].local_convo_id.is_empty());
-        assert!(!convos[0].remote_convo_id.is_empty());
 
-        // Drop and reopen - metadata should still be there
         drop(alice);
         let alice2 = Context::open("alice", config).unwrap();
         let convos = alice2.storage.load_conversations().unwrap();
         assert_eq!(convos.len(), 1, "conversation metadata should persist");
     }
+
+    #[test]
+    fn conversation_full_persistence() {
+        let dir = tempfile::tempdir().unwrap();
+        let db_path = dir
+            .path()
+            .join("test_full_persist.db")
+            .to_string_lossy()
+            .to_string();
+        let config = StorageConfig::File(db_path);
+
+        // Alice and Bob establish a conversation
+        let mut alice = Context::open("alice", config.clone()).unwrap();
+        let mut bob = Context::new_with_name("bob");
+
+        let bundle = alice.create_intro_bundle().unwrap();
+        let intro = Introduction::try_from(bundle.as_slice()).unwrap();
+        let (bob_convo_id, payloads) = bob.create_private_convo(&intro, b"hello");
+
+        let payload = payloads.first().unwrap();
+        let content = alice.handle_payload(&payload.data).unwrap().unwrap();
+        let alice_convo_id = content.conversation_id;
+
+        // Exchange a few messages to advance ratchet state
+        let payloads = alice.send_content(&alice_convo_id, b"reply 1").unwrap();
+        let payload = payloads.first().unwrap();
+        bob.handle_payload(&payload.data).unwrap().unwrap();
+
+        let payloads = bob.send_content(&bob_convo_id, b"reply 2").unwrap();
+        let payload = payloads.first().unwrap();
+        alice.handle_payload(&payload.data).unwrap().unwrap();
+
+        // Drop Alice and reopen - conversation should survive
+        drop(alice);
+        let mut alice2 = Context::open("alice", config).unwrap();
+
+        // Verify conversation was restored
+        let convo_ids = alice2.list_conversations().unwrap();
+        assert_eq!(convo_ids.len(), 1);
+
+        // Bob sends a new message - Alice should be able to decrypt after restart
+        let payloads = bob.send_content(&bob_convo_id, b"after restart").unwrap();
+        let payload = payloads.first().unwrap();
+        let content = alice2
+            .handle_payload(&payload.data)
+            .expect("should decrypt after restart")
+            .expect("should have content");
+        assert_eq!(content.data, b"after restart");
+
+        // Alice can also send back
+        let payloads = alice2
+            .send_content(&alice_convo_id, b"alice after restart")
+            .unwrap();
+        let payload = payloads.first().unwrap();
+        let content = bob
+            .handle_payload(&payload.data)
+            .unwrap()
+            .expect("bob should receive");
+        assert_eq!(content.data, b"alice after restart");
+    }
 }

conversations/src/conversation.rs

@@ -4,6 +4,7 @@ use std::sync::Arc;
 
 pub use crate::errors::ChatError;
 use crate::types::{AddressedEncryptedPayload, ContentData};
+use double_ratchets::RatchetStorage;
 
 pub type ConversationId<'a> = &'a str;
 pub type ConversationIdOwned = Arc<str>;
@@ -30,6 +31,11 @@ pub trait Convo: Id + Debug {
 
     /// Returns the conversation type identifier for storage.
     fn convo_type(&self) -> &str;
+
+    /// Persists ratchet state to storage. Default is no-op.
+    fn save_ratchet_state(&self, _storage: &mut RatchetStorage) -> Result<(), ChatError> {
+        Ok(())
+    }
 }
 
 pub struct ConversationStore {

conversations/src/conversation/privatev1.rs

@@ -18,6 +18,7 @@ use crate::{
     types::{AddressedEncryptedPayload, ContentData},
     utils::timestamp_millis,
 };
+use double_ratchets::RatchetStorage;
 
 // Represents the potential participant roles in this Conversation
 enum Role {
@@ -77,6 +78,19 @@ impl PrivateV1Convo {
         }
     }
 
+    /// Reconstructs a PrivateV1Convo from persisted metadata and ratchet state.
+    pub fn from_stored(
+        local_convo_id: String,
+        remote_convo_id: String,
+        dr_state: RatchetState,
+    ) -> Self {
+        Self {
+            local_convo_id,
+            remote_convo_id,
+            dr_state,
+        }
+    }
+
     pub fn new_responder(seed_key: SymmetricKey32, dh_self: &PrivateKey) -> Self {
         let base_convo_id = BaseConvoId::new(&seed_key);
         let local_convo_id = base_convo_id.id_for_participant(Role::Responder);
@@ -213,6 +227,11 @@ impl Convo for PrivateV1Convo {
     fn convo_type(&self) -> &str {
         "private_v1"
     }
+
+    fn save_ratchet_state(&self, storage: &mut RatchetStorage) -> Result<(), ChatError> {
+        storage.save(&self.local_convo_id, &self.dr_state)?;
+        Ok(())
+    }
 }
 
 impl Debug for PrivateV1Convo {

double-ratchets/src/storage/db.rs

@@ -59,6 +59,12 @@ impl RatchetStorage {
         Self::run_migration(db)
     }
 
+    /// Creates a ratchet storage from a generic storage configuration.
+    pub fn from_config(config: storage::StorageConfig) -> Result<Self, StorageError> {
+        let db = SqliteDb::new(config)?;
+        Self::run_migration(db)
+    }
+
     /// Creates a new ratchet storage with the given database.
     fn run_migration(db: SqliteDb) -> Result<Self, StorageError> {
         // Initialize schema