send document ping

backend/src/services/document/persistence.rs

@@ -19,7 +19,7 @@ use protobuf::Message;
 use std::sync::Arc;
 use uuid::Uuid;
 
-#[tracing::instrument(level = "debug", skip(kv_store), err)]
+#[tracing::instrument(level = "debug", skip(kv_store, params), err)]
 pub(crate) async fn create_document(
     kv_store: &Arc<DocumentKVPersistence>,
     mut params: CreateDocParams,
@@ -50,7 +50,7 @@ pub async fn reset_document(
         .transaction(|mut transaction| {
             Box::pin(async move {
                 let _ = transaction.batch_delete_key_start_with(&doc_id).await?;
-                let items = revisions_to_key_value_items(revisions.into());
+                let items = revisions_to_key_value_items(revisions.into())?;
                 let _ = transaction.batch_set(items).await?;
                 Ok(())
             })
@@ -82,7 +82,7 @@ impl DocumentKVPersistence {
     pub(crate) fn new(kv_store: Arc<KVStore>) -> Self { DocumentKVPersistence { inner: kv_store } }
 
     pub(crate) async fn batch_set_revision(&self, revisions: Vec<Revision>) -> Result<(), ServerError> {
-        let items = revisions_to_key_value_items(revisions);
+        let items = revisions_to_key_value_items(revisions)?;
         self.inner
             .transaction(|mut t| Box::pin(async move { t.batch_set(items).await }))
             .await
@@ -152,15 +152,19 @@ impl DocumentKVPersistence {
 }
 
 #[inline]
-fn revisions_to_key_value_items(revisions: Vec<Revision>) -> Vec<KeyValue> {
-    revisions
-        .into_iter()
-        .map(|revision| {
-            let key = make_revision_key(&revision.doc_id, revision.rev_id);
-            let value = Bytes::from(revision.write_to_bytes().unwrap());
-            KeyValue { key, value }
-        })
-        .collect::<Vec<KeyValue>>()
+fn revisions_to_key_value_items(revisions: Vec<Revision>) -> Result<Vec<KeyValue>, ServerError> {
+    let mut items = vec![];
+    for revision in revisions {
+        let key = make_revision_key(&revision.doc_id, revision.rev_id);
+
+        if revision.delta_data.is_empty() {
+            return Err(ServerError::internal().context("The delta_data of Revision should not be empty"));
+        }
+
+        let value = Bytes::from(revision.write_to_bytes().unwrap());
+        items.push(KeyValue { key, value });
+    }
+    Ok(items)
 }
 
 #[inline]
@@ -193,6 +197,11 @@ fn make_doc_from_revisions(doc_id: &str, mut revisions: RepeatedRevision) -> Res
     for revision in revisions {
         base_rev_id = revision.base_rev_id;
         rev_id = revision.rev_id;
+
+        if revision.delta_data.is_empty() {
+            tracing::warn!("revision delta_data is empty");
+        }
+
         let delta = RichTextDelta::from_bytes(revision.delta_data).map_err(internal_error)?;
         document_delta = document_delta.compose(&delta).map_err(internal_error)?;
     }

backend/src/services/document/ws_actor.rs

@@ -87,17 +87,18 @@ impl DocumentWebSocketActor {
 
         match &document_client_data.ty {
             DocumentClientWSDataType::ClientPushRev => {
-                match self
+                let _ = self
                     .doc_manager
-                    .apply_revisions(user, document_client_data)
+                    .handle_client_revisions(user, document_client_data)
                     .await
-                    .map_err(internal_error)
-                {
-                    Ok(_) => {},
-                    Err(e) => {
-                        tracing::error!("[DocumentWebSocketActor]: process client data failed: {:?}", e);
-                    },
-                }
+                    .map_err(internal_error)?;
+            },
+            DocumentClientWSDataType::ClientPing => {
+                let _ = self
+                    .doc_manager
+                    .handle_client_ping(user, document_client_data)
+                    .await
+                    .map_err(internal_error)?;
             },
         }
 

backend/tests/document_test/edit_script.rs

@@ -2,22 +2,20 @@
 #![cfg_attr(rustfmt, rustfmt::skip)]
 use std::convert::TryInto;
 use actix_web::web::Data;
-use flowy_document::services::doc::edit::ClientDocEditor as ClientEditDocContext;
+use flowy_document::services::doc::edit::ClientDocumentEditor;
 use flowy_test::{helper::ViewTest, FlowySDKTest};
 use flowy_user::services::user::UserSession;
 use futures_util::{stream, stream::StreamExt};
-
 use std::sync::Arc;
 use bytes::Bytes;
 use tokio::time::{sleep, Duration};
 // use crate::helper::*;
 use crate::util::helper::{spawn_server, TestServer};
-use flowy_collaboration::{entities::doc::DocIdentifier, protobuf::ResetDocumentParams};
+use flowy_collaboration::{entities::doc::DocumentId, protobuf::ResetDocumentParams};
 use lib_ot::rich_text::{RichTextAttribute, RichTextDelta};
 use parking_lot::RwLock;
 use backend::services::document::persistence::{DocumentKVPersistence, read_document, reset_document};
-
-use flowy_collaboration::entities::revision::{RepeatedRevision, Revision, RevType};
+use flowy_collaboration::entities::revision::{RepeatedRevision, Revision};
 use lib_ot::core::Interval;
 
 use flowy_net::services::ws::FlowyWSConnect;
@@ -56,7 +54,7 @@ impl DocumentTest {
 
 #[derive(Clone)]
 struct ScriptContext {
-    client_edit_context: Option<Arc<ClientEditDocContext>>,
+    client_edit_context: Option<Arc<ClientDocumentEditor>>,
     client_sdk: FlowySDKTest,
     client_user_session: Arc<UserSession>,
     ws_conn: Arc<FlowyWSConnect>,
@@ -82,11 +80,11 @@ impl ScriptContext {
 
     async fn open_doc(&mut self) {
         let doc_id = self.doc_id.clone();
-        let edit_context = self.client_sdk.document_ctx.open(DocIdentifier { doc_id }).await.unwrap();
+        let edit_context = self.client_sdk.document_ctx.controller.open(doc_id).await.unwrap();
         self.client_edit_context = Some(edit_context);
     }
 
-    fn client_edit_context(&self) -> Arc<ClientEditDocContext> { self.client_edit_context.as_ref().unwrap().clone() }
+    fn client_edit_context(&self) -> Arc<ClientDocumentEditor> { self.client_edit_context.as_ref().unwrap().clone() }
 }
 
 async fn run_scripts(context: Arc<RwLock<ScriptContext>>, scripts: Vec<DocScript>) {
@@ -126,7 +124,7 @@ async fn run_scripts(context: Arc<RwLock<ScriptContext>>, scripts: Vec<DocScript
                 DocScript::AssertServer(s, rev_id) => {
                     sleep(Duration::from_millis(100)).await;
                     let persistence = Data::new(context.read().server.app_ctx.persistence.kv_store());
-                    let doc_identifier: flowy_collaboration::protobuf::DocIdentifier = DocIdentifier {
+                    let doc_identifier: flowy_collaboration::protobuf::DocumentId = DocumentId {
                         doc_id
                     }.try_into().unwrap();
                     
@@ -144,7 +142,6 @@ async fn run_scripts(context: Arc<RwLock<ScriptContext>>, scripts: Vec<DocScript
                         base_rev_id,
                         rev_id,
                         delta_data,
-                        RevType::Remote,
                         &user_id,
                         md5,
                     );

backend/tests/document_test/mod.rs

@@ -1,2 +1,2 @@
-// mod edit_script;
-// mod edit_test;
+mod edit_script;
+mod edit_test;

frontend/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-collaboration/revision.pbenum.dart

@@ -10,11 +10,11 @@ import 'dart:core' as $core;
 import 'package:protobuf/protobuf.dart' as $pb;
 
 class RevisionState extends $pb.ProtobufEnum {
-  static const RevisionState StateLocal = RevisionState._(0, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'StateLocal');
+  static const RevisionState Local = RevisionState._(0, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'Local');
   static const RevisionState Ack = RevisionState._(1, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'Ack');
 
   static const $core.List<RevisionState> values = <RevisionState> [
-    StateLocal,
+    Local,
     Ack,
   ];
 

frontend/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-collaboration/revision.pbjson.dart

@@ -12,13 +12,13 @@ import 'dart:typed_data' as $typed_data;
 const RevisionState$json = const {
   '1': 'RevisionState',
   '2': const [
-    const {'1': 'StateLocal', '2': 0},
+    const {'1': 'Local', '2': 0},
     const {'1': 'Ack', '2': 1},
   ],
 };
 
 /// Descriptor for `RevisionState`. Decode as a `google.protobuf.EnumDescriptorProto`.
-final $typed_data.Uint8List revisionStateDescriptor = $convert.base64Decode('Cg1SZXZpc2lvblN0YXRlEg4KClN0YXRlTG9jYWwQABIHCgNBY2sQAQ==');
+final $typed_data.Uint8List revisionStateDescriptor = $convert.base64Decode('Cg1SZXZpc2lvblN0YXRlEgkKBUxvY2FsEAASBwoDQWNrEAE=');
 @$core.Deprecated('Use revTypeDescriptor instead')
 const RevType$json = const {
   '1': 'RevType',

frontend/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-collaboration/ws.pbenum.dart

@@ -11,9 +11,11 @@ import 'package:protobuf/protobuf.dart' as $pb;
 
 class DocumentClientWSDataType extends $pb.ProtobufEnum {
   static const DocumentClientWSDataType ClientPushRev = DocumentClientWSDataType._(0, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'ClientPushRev');
+  static const DocumentClientWSDataType ClientPing = DocumentClientWSDataType._(1, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'ClientPing');
 
   static const $core.List<DocumentClientWSDataType> values = <DocumentClientWSDataType> [
     ClientPushRev,
+    ClientPing,
   ];
 
   static final $core.Map<$core.int, DocumentClientWSDataType> _byValue = $pb.ProtobufEnum.initByValue(values);

frontend/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-collaboration/ws.pbjson.dart

@@ -13,11 +13,12 @@ const DocumentClientWSDataType$json = const {
   '1': 'DocumentClientWSDataType',
   '2': const [
     const {'1': 'ClientPushRev', '2': 0},
+    const {'1': 'ClientPing', '2': 1},
   ],
 };
 
 /// Descriptor for `DocumentClientWSDataType`. Decode as a `google.protobuf.EnumDescriptorProto`.
-final $typed_data.Uint8List documentClientWSDataTypeDescriptor = $convert.base64Decode('ChhEb2N1bWVudENsaWVudFdTRGF0YVR5cGUSEQoNQ2xpZW50UHVzaFJldhAA');
+final $typed_data.Uint8List documentClientWSDataTypeDescriptor = $convert.base64Decode('ChhEb2N1bWVudENsaWVudFdTRGF0YVR5cGUSEQoNQ2xpZW50UHVzaFJldhAAEg4KCkNsaWVudFBpbmcQAQ==');
 @$core.Deprecated('Use documentServerWSDataTypeDescriptor instead')
 const DocumentServerWSDataType$json = const {
   '1': 'DocumentServerWSDataType',

frontend/app_flowy/pubspec.lock

@@ -688,6 +688,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.2"
   meta:
     dependency: transitive
     description:
@@ -1077,7 +1084,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.3"
+    version: "0.4.8"
   textstyle_extensions:
     dependency: transitive
     description:

frontend/rust-lib/flowy-core/src/services/view/controller.rs

@@ -62,8 +62,8 @@ impl ViewController {
     }
 
     #[tracing::instrument(level = "debug", skip(self, params), fields(name = %params.name), err)]
-    pub(crate) async fn create_view_from_params(&self, mut params: CreateViewParams) -> Result<View, FlowyError> {
-        let delta_data = Bytes::from(params.take_view_data());
+    pub(crate) async fn create_view_from_params(&self, params: CreateViewParams) -> Result<View, FlowyError> {
+        let delta_data = Bytes::from(params.view_data.clone());
         let user_id = self.user.user_id()?;
         let repeated_revision: RepeatedRevision =
             Revision::initial_revision(&user_id, &params.view_id, delta_data).into();

frontend/rust-lib/flowy-document/src/services/doc/revision/manager.rs

@@ -26,7 +26,7 @@ pub trait RevisionServer: Send + Sync {
 }
 
 pub struct RevisionManager {
-    doc_id: String,
+    pub(crate) doc_id: String,
     user_id: String,
     rev_id_counter: RevIdCounter,
     cache: Arc<RevisionCache>,
@@ -67,6 +67,9 @@ impl RevisionManager {
 
     #[tracing::instrument(level = "debug", skip(self, revision))]
     pub async fn add_remote_revision(&self, revision: &Revision) -> Result<(), FlowyError> {
+        if revision.delta_data.is_empty() {
+            return Err(FlowyError::internal().context("Delta data should be empty"));
+        }
         self.rev_id_counter.set(revision.rev_id);
         let _ = self.cache.add(revision.clone(), RevisionState::Ack, true).await?;
         Ok(())
@@ -74,6 +77,10 @@ impl RevisionManager {
 
     #[tracing::instrument(level = "debug", skip(self, revision))]
     pub async fn add_local_revision(&self, revision: &Revision) -> Result<(), FlowyError> {
+        if revision.delta_data.is_empty() {
+            return Err(FlowyError::internal().context("Delta data should be empty"));
+        }
+
         let record = self.cache.add(revision.clone(), RevisionState::Local, true).await?;
         self.sync_seq.add_revision(record).await?;
         Ok(())

frontend/rust-lib/flowy-document/src/services/doc/web_socket/web_socket.rs

@@ -285,7 +285,12 @@ impl SharedWSSinkDataProvider {
                         let doc_id = rev.doc_id.clone();
                         Ok(Some(DocumentClientWSData::from_revisions(&doc_id, vec![rev])))
                     },
-                    None => Ok(None),
+                    None => {
+                        //
+                        let doc_id = self.rev_manager.doc_id.clone();
+                        let latest_rev_id = self.rev_manager.rev_id();
+                        Ok(Some(DocumentClientWSData::ping(&doc_id, latest_rev_id)))
+                    },
                 }
             },
         }

frontend/rust-lib/flowy-virtual-net/src/mock/server.rs

@@ -37,9 +37,15 @@ impl MockDocServer {
                 });
                 let pb_client_data: flowy_collaboration::protobuf::DocumentClientWSData =
                     client_data.try_into().unwrap();
-                self.manager.apply_revisions(user, pb_client_data).await.unwrap();
+                self.manager
+                    .handle_client_revisions(user, pb_client_data)
+                    .await
+                    .unwrap();
                 Some(rx)
             },
+            DocumentClientWSDataType::ClientPing => {
+                todo!()
+            },
         }
     }
 }

shared-lib/flowy-collaboration/src/entities/revision.rs

@@ -117,6 +117,8 @@ impl RepeatedRevision {
         Self { items }
     }
 
+    pub fn empty() -> Self { RepeatedRevision { items: vec![] } }
+
     pub fn into_inner(self) -> Vec<Revision> { self.items }
 }
 

shared-lib/flowy-collaboration/src/entities/ws.rs

@@ -9,6 +9,7 @@ use std::convert::{TryFrom, TryInto};
 #[derive(Debug, Clone, ProtoBuf_Enum, Eq, PartialEq, Hash)]
 pub enum DocumentClientWSDataType {
     ClientPushRev = 0,
+    ClientPing    = 1,
 }
 
 impl DocumentClientWSDataType {
@@ -54,6 +55,15 @@ impl DocumentClientWSData {
         }
     }
 
+    pub fn ping(doc_id: &str, rev_id: i64) -> Self {
+        Self {
+            doc_id: doc_id.to_owned(),
+            ty: DocumentClientWSDataType::ClientPing,
+            revisions: RepeatedRevision::empty(),
+            id: rev_id.to_string(),
+        }
+    }
+
     pub fn id(&self) -> String { self.id.clone() }
 }
 

shared-lib/flowy-collaboration/src/protobuf/model/revision.rs

@@ -958,7 +958,7 @@ impl ::protobuf::reflect::ProtobufValue for RevisionRange {
 
 #[derive(Clone,PartialEq,Eq,Debug,Hash)]
 pub enum RevisionState {
-    StateLocal = 0,
+    Local = 0,
     Ack = 1,
 }
 
@@ -969,7 +969,7 @@ impl ::protobuf::ProtobufEnum for RevisionState {
 
     fn from_i32(value: i32) -> ::std::option::Option<RevisionState> {
         match value {
-            0 => ::std::option::Option::Some(RevisionState::StateLocal),
+            0 => ::std::option::Option::Some(RevisionState::Local),
             1 => ::std::option::Option::Some(RevisionState::Ack),
             _ => ::std::option::Option::None
         }
@@ -977,7 +977,7 @@ impl ::protobuf::ProtobufEnum for RevisionState {
 
     fn values() -> &'static [Self] {
         static values: &'static [RevisionState] = &[
-            RevisionState::StateLocal,
+            RevisionState::Local,
             RevisionState::Ack,
         ];
         values
@@ -996,7 +996,7 @@ impl ::std::marker::Copy for RevisionState {
 
 impl ::std::default::Default for RevisionState {
     fn default() -> Self {
-        RevisionState::StateLocal
+        RevisionState::Local
     }
 }
 
@@ -1067,8 +1067,8 @@ static file_descriptor_proto_data: &'static [u8] = b"\
     \"\x1d\n\x05RevId\x12\x14\n\x05value\x18\x01\x20\x01(\x03R\x05value\"N\n\
     \rRevisionRange\x12\x15\n\x06doc_id\x18\x01\x20\x01(\tR\x05docId\x12\x14\
     \n\x05start\x18\x02\x20\x01(\x03R\x05start\x12\x10\n\x03end\x18\x03\x20\
-    \x01(\x03R\x03end*(\n\rRevisionState\x12\x0e\n\nStateLocal\x10\0\x12\x07\
-    \n\x03Ack\x10\x01*4\n\x07RevType\x12\x13\n\x0fDeprecatedLocal\x10\0\x12\
+    \x01(\x03R\x03end*#\n\rRevisionState\x12\t\n\x05Local\x10\0\x12\x07\n\
+    \x03Ack\x10\x01*4\n\x07RevType\x12\x13\n\x0fDeprecatedLocal\x10\0\x12\
     \x14\n\x10DeprecatedRemote\x10\x01J\xe8\x07\n\x06\x12\x04\0\0\x1d\x01\n\
     \x08\n\x01\x0c\x12\x03\0\0\x12\n\n\n\x02\x04\0\x12\x04\x02\0\n\x01\n\n\n\
     \x03\x04\0\x01\x12\x03\x02\x08\x10\n\x0b\n\x04\x04\0\x02\0\x12\x03\x03\
@@ -1109,16 +1109,16 @@ static file_descriptor_proto_data: &'static [u8] = b"\
     \n\x0c\n\x05\x04\x03\x02\x02\x05\x12\x03\x14\x04\t\n\x0c\n\x05\x04\x03\
     \x02\x02\x01\x12\x03\x14\n\r\n\x0c\n\x05\x04\x03\x02\x02\x03\x12\x03\x14\
     \x10\x11\n\n\n\x02\x05\0\x12\x04\x16\0\x19\x01\n\n\n\x03\x05\0\x01\x12\
-    \x03\x16\x05\x12\n\x0b\n\x04\x05\0\x02\0\x12\x03\x17\x04\x13\n\x0c\n\x05\
-    \x05\0\x02\0\x01\x12\x03\x17\x04\x0e\n\x0c\n\x05\x05\0\x02\0\x02\x12\x03\
-    \x17\x11\x12\n\x0b\n\x04\x05\0\x02\x01\x12\x03\x18\x04\x0c\n\x0c\n\x05\
-    \x05\0\x02\x01\x01\x12\x03\x18\x04\x07\n\x0c\n\x05\x05\0\x02\x01\x02\x12\
-    \x03\x18\n\x0b\n\n\n\x02\x05\x01\x12\x04\x1a\0\x1d\x01\n\n\n\x03\x05\x01\
-    \x01\x12\x03\x1a\x05\x0c\n\x0b\n\x04\x05\x01\x02\0\x12\x03\x1b\x04\x18\n\
-    \x0c\n\x05\x05\x01\x02\0\x01\x12\x03\x1b\x04\x13\n\x0c\n\x05\x05\x01\x02\
-    \0\x02\x12\x03\x1b\x16\x17\n\x0b\n\x04\x05\x01\x02\x01\x12\x03\x1c\x04\
-    \x19\n\x0c\n\x05\x05\x01\x02\x01\x01\x12\x03\x1c\x04\x14\n\x0c\n\x05\x05\
-    \x01\x02\x01\x02\x12\x03\x1c\x17\x18b\x06proto3\
+    \x03\x16\x05\x12\n\x0b\n\x04\x05\0\x02\0\x12\x03\x17\x04\x0e\n\x0c\n\x05\
+    \x05\0\x02\0\x01\x12\x03\x17\x04\t\n\x0c\n\x05\x05\0\x02\0\x02\x12\x03\
+    \x17\x0c\r\n\x0b\n\x04\x05\0\x02\x01\x12\x03\x18\x04\x0c\n\x0c\n\x05\x05\
+    \0\x02\x01\x01\x12\x03\x18\x04\x07\n\x0c\n\x05\x05\0\x02\x01\x02\x12\x03\
+    \x18\n\x0b\n\n\n\x02\x05\x01\x12\x04\x1a\0\x1d\x01\n\n\n\x03\x05\x01\x01\
+    \x12\x03\x1a\x05\x0c\n\x0b\n\x04\x05\x01\x02\0\x12\x03\x1b\x04\x18\n\x0c\
+    \n\x05\x05\x01\x02\0\x01\x12\x03\x1b\x04\x13\n\x0c\n\x05\x05\x01\x02\0\
+    \x02\x12\x03\x1b\x16\x17\n\x0b\n\x04\x05\x01\x02\x01\x12\x03\x1c\x04\x19\
+    \n\x0c\n\x05\x05\x01\x02\x01\x01\x12\x03\x1c\x04\x14\n\x0c\n\x05\x05\x01\
+    \x02\x01\x02\x12\x03\x1c\x17\x18b\x06proto3\
 ";
 
 static file_descriptor_proto_lazy: ::protobuf::rt::LazyV2<::protobuf::descriptor::FileDescriptorProto> = ::protobuf::rt::LazyV2::INIT;

shared-lib/flowy-collaboration/src/protobuf/model/ws.rs

@@ -790,6 +790,7 @@ impl ::protobuf::reflect::ProtobufValue for NewDocumentUser {
 #[derive(Clone,PartialEq,Eq,Debug,Hash)]
 pub enum DocumentClientWSDataType {
     ClientPushRev = 0,
+    ClientPing = 1,
 }
 
 impl ::protobuf::ProtobufEnum for DocumentClientWSDataType {
@@ -800,6 +801,7 @@ impl ::protobuf::ProtobufEnum for DocumentClientWSDataType {
     fn from_i32(value: i32) -> ::std::option::Option<DocumentClientWSDataType> {
         match value {
             0 => ::std::option::Option::Some(DocumentClientWSDataType::ClientPushRev),
+            1 => ::std::option::Option::Some(DocumentClientWSDataType::ClientPing),
             _ => ::std::option::Option::None
         }
     }
@@ -807,6 +809,7 @@ impl ::protobuf::ProtobufEnum for DocumentClientWSDataType {
     fn values() -> &'static [Self] {
         static values: &'static [DocumentClientWSDataType] = &[
             DocumentClientWSDataType::ClientPushRev,
+            DocumentClientWSDataType::ClientPing,
         ];
         values
     }
@@ -900,55 +903,57 @@ static file_descriptor_proto_data: &'static [u8] = b"\
     umentServerWSDataTypeR\x02ty\x12\x12\n\x04data\x18\x03\x20\x01(\x0cR\x04\
     data\"f\n\x0fNewDocumentUser\x12\x17\n\x07user_id\x18\x01\x20\x01(\tR\
     \x06userId\x12\x15\n\x06doc_id\x18\x02\x20\x01(\tR\x05docId\x12#\n\rrevi\
-    sion_data\x18\x03\x20\x01(\x0cR\x0crevisionData*-\n\x18DocumentClientWSD\
-    ataType\x12\x11\n\rClientPushRev\x10\0*`\n\x18DocumentServerWSDataType\
-    \x12\r\n\tServerAck\x10\0\x12\x11\n\rServerPushRev\x10\x01\x12\x11\n\rSe\
-    rverPullRev\x10\x02\x12\x0f\n\x0bUserConnect\x10\x03J\x88\x07\n\x06\x12\
-    \x04\0\0\x1b\x01\n\x08\n\x01\x0c\x12\x03\0\0\x12\n\t\n\x02\x03\0\x12\x03\
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-    \x0b\n\x04\x05\x01\x02\0\x12\x03\x17\x04\x12\n\x0c\n\x05\x05\x01\x02\0\
-    \x01\x12\x03\x17\x04\r\n\x0c\n\x05\x05\x01\x02\0\x02\x12\x03\x17\x10\x11\
-    \n\x0b\n\x04\x05\x01\x02\x01\x12\x03\x18\x04\x16\n\x0c\n\x05\x05\x01\x02\
-    \x01\x01\x12\x03\x18\x04\x11\n\x0c\n\x05\x05\x01\x02\x01\x02\x12\x03\x18\
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-    \x03\x19\x14\x15\n\x0b\n\x04\x05\x01\x02\x03\x12\x03\x1a\x04\x14\n\x0c\n\
-    \x05\x05\x01\x02\x03\x01\x12\x03\x1a\x04\x0f\n\x0c\n\x05\x05\x01\x02\x03\
-    \x02\x12\x03\x1a\x12\x13b\x06proto3\
+    sion_data\x18\x03\x20\x01(\x0cR\x0crevisionData*=\n\x18DocumentClientWSD\
+    ataType\x12\x11\n\rClientPushRev\x10\0\x12\x0e\n\nClientPing\x10\x01*`\n\
+    \x18DocumentServerWSDataType\x12\r\n\tServerAck\x10\0\x12\x11\n\rServerP\
+    ushRev\x10\x01\x12\x11\n\rServerPullRev\x10\x02\x12\x0f\n\x0bUserConnect\
+    \x10\x03J\xb1\x07\n\x06\x12\x04\0\0\x1c\x01\n\x08\n\x01\x0c\x12\x03\0\0\
+    \x12\n\t\n\x02\x03\0\x12\x03\x01\0\x18\n\n\n\x02\x04\0\x12\x04\x03\0\x08\
+    \x01\n\n\n\x03\x04\0\x01\x12\x03\x03\x08\x1c\n\x0b\n\x04\x04\0\x02\0\x12\
+    \x03\x04\x04\x16\n\x0c\n\x05\x04\0\x02\0\x05\x12\x03\x04\x04\n\n\x0c\n\
+    \x05\x04\0\x02\0\x01\x12\x03\x04\x0b\x11\n\x0c\n\x05\x04\0\x02\0\x03\x12\
+    \x03\x04\x14\x15\n\x0b\n\x04\x04\0\x02\x01\x12\x03\x05\x04$\n\x0c\n\x05\
+    \x04\0\x02\x01\x06\x12\x03\x05\x04\x1c\n\x0c\n\x05\x04\0\x02\x01\x01\x12\
+    \x03\x05\x1d\x1f\n\x0c\n\x05\x04\0\x02\x01\x03\x12\x03\x05\"#\n\x0b\n\
+    \x04\x04\0\x02\x02\x12\x03\x06\x04#\n\x0c\n\x05\x04\0\x02\x02\x06\x12\
+    \x03\x06\x04\x14\n\x0c\n\x05\x04\0\x02\x02\x01\x12\x03\x06\x15\x1e\n\x0c\
+    \n\x05\x04\0\x02\x02\x03\x12\x03\x06!\"\n\x0b\n\x04\x04\0\x02\x03\x12\
+    \x03\x07\x04\x12\n\x0c\n\x05\x04\0\x02\x03\x05\x12\x03\x07\x04\n\n\x0c\n\
+    \x05\x04\0\x02\x03\x01\x12\x03\x07\x0b\r\n\x0c\n\x05\x04\0\x02\x03\x03\
+    \x12\x03\x07\x10\x11\n\n\n\x02\x04\x01\x12\x04\t\0\r\x01\n\n\n\x03\x04\
+    \x01\x01\x12\x03\t\x08\x1c\n\x0b\n\x04\x04\x01\x02\0\x12\x03\n\x04\x16\n\
+    \x0c\n\x05\x04\x01\x02\0\x05\x12\x03\n\x04\n\n\x0c\n\x05\x04\x01\x02\0\
+    \x01\x12\x03\n\x0b\x11\n\x0c\n\x05\x04\x01\x02\0\x03\x12\x03\n\x14\x15\n\
+    \x0b\n\x04\x04\x01\x02\x01\x12\x03\x0b\x04$\n\x0c\n\x05\x04\x01\x02\x01\
+    \x06\x12\x03\x0b\x04\x1c\n\x0c\n\x05\x04\x01\x02\x01\x01\x12\x03\x0b\x1d\
+    \x1f\n\x0c\n\x05\x04\x01\x02\x01\x03\x12\x03\x0b\"#\n\x0b\n\x04\x04\x01\
+    \x02\x02\x12\x03\x0c\x04\x13\n\x0c\n\x05\x04\x01\x02\x02\x05\x12\x03\x0c\
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+    \x01\x02\x02\x03\x12\x03\x0c\x11\x12\n\n\n\x02\x04\x02\x12\x04\x0e\0\x12\
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+    \x12\x03\x0f\x04\x17\n\x0c\n\x05\x04\x02\x02\0\x05\x12\x03\x0f\x04\n\n\
+    \x0c\n\x05\x04\x02\x02\0\x01\x12\x03\x0f\x0b\x12\n\x0c\n\x05\x04\x02\x02\
+    \0\x03\x12\x03\x0f\x15\x16\n\x0b\n\x04\x04\x02\x02\x01\x12\x03\x10\x04\
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+    \x05\x04\x02\x02\x02\x05\x12\x03\x11\x04\t\n\x0c\n\x05\x04\x02\x02\x02\
+    \x01\x12\x03\x11\n\x17\n\x0c\n\x05\x04\x02\x02\x02\x03\x12\x03\x11\x1a\
+    \x1b\n\n\n\x02\x05\0\x12\x04\x13\0\x16\x01\n\n\n\x03\x05\0\x01\x12\x03\
+    \x13\x05\x1d\n\x0b\n\x04\x05\0\x02\0\x12\x03\x14\x04\x16\n\x0c\n\x05\x05\
+    \0\x02\0\x01\x12\x03\x14\x04\x11\n\x0c\n\x05\x05\0\x02\0\x02\x12\x03\x14\
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+    \x02\x01\x01\x12\x03\x15\x04\x0e\n\x0c\n\x05\x05\0\x02\x01\x02\x12\x03\
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+    \x01\x12\x03\x17\x05\x1d\n\x0b\n\x04\x05\x01\x02\0\x12\x03\x18\x04\x12\n\
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+    \x02\x12\x03\x18\x10\x11\n\x0b\n\x04\x05\x01\x02\x01\x12\x03\x19\x04\x16\
+    \n\x0c\n\x05\x05\x01\x02\x01\x01\x12\x03\x19\x04\x11\n\x0c\n\x05\x05\x01\
+    \x02\x01\x02\x12\x03\x19\x14\x15\n\x0b\n\x04\x05\x01\x02\x02\x12\x03\x1a\
+    \x04\x16\n\x0c\n\x05\x05\x01\x02\x02\x01\x12\x03\x1a\x04\x11\n\x0c\n\x05\
+    \x05\x01\x02\x02\x02\x12\x03\x1a\x14\x15\n\x0b\n\x04\x05\x01\x02\x03\x12\
+    \x03\x1b\x04\x14\n\x0c\n\x05\x05\x01\x02\x03\x01\x12\x03\x1b\x04\x0f\n\
+    \x0c\n\x05\x05\x01\x02\x03\x02\x12\x03\x1b\x12\x13b\x06proto3\
 ";
 
 static file_descriptor_proto_lazy: ::protobuf::rt::LazyV2<::protobuf::descriptor::FileDescriptorProto> = ::protobuf::rt::LazyV2::INIT;

shared-lib/flowy-collaboration/src/protobuf/proto/revision.proto

@@ -21,7 +21,7 @@ message RevisionRange {
     int64 end = 3;
 }
 enum RevisionState {
-    StateLocal = 0;
+    Local = 0;
     Ack = 1;
 }
 enum RevType {

shared-lib/flowy-collaboration/src/protobuf/proto/ws.proto

@@ -19,6 +19,7 @@ message NewDocumentUser {
 }
 enum DocumentClientWSDataType {
     ClientPushRev = 0;
+    ClientPing = 1;
 }
 enum DocumentServerWSDataType {
     ServerAck = 0;

shared-lib/flowy-collaboration/src/sync/server.rs

@@ -40,16 +40,14 @@ impl ServerDocumentManager {
         }
     }
 
-    pub async fn apply_revisions(
+    pub async fn handle_client_revisions(
         &self,
         user: Arc<dyn RevisionUser>,
         mut client_data: DocumentClientWSData,
     ) -> Result<(), CollaborateError> {
         let mut pb = client_data.take_revisions();
         let cloned_user = user.clone();
-        let ack_id = client_data.id.clone().parse::<i64>().map_err(|e| {
-            CollaborateError::internal().context(format!("Parse rev_id from {} failed. {}", &client_data.id, e))
-        })?;
+        let ack_id = rev_id_from_str(&client_data.id)?;
         let doc_id = client_data.doc_id;
 
         let revisions = spawn_blocking(move || {
@@ -81,6 +79,23 @@ impl ServerDocumentManager {
         result
     }
 
+    pub async fn handle_client_ping(
+        &self,
+        user: Arc<dyn RevisionUser>,
+        client_data: DocumentClientWSData,
+    ) -> Result<(), CollaborateError> {
+        let rev_id = rev_id_from_str(&client_data.id)?;
+        let doc_id = client_data.doc_id.clone();
+
+        match self.get_document_handler(&doc_id).await {
+            None => Ok(()),
+            Some(handler) => {
+                let _ = handler.apply_ping(doc_id.clone(), rev_id, user).await?;
+                Ok(())
+            },
+        }
+    }
+
     async fn get_document_handler(&self, doc_id: &str) -> Option<Arc<OpenDocHandle>> {
         match self.open_doc_map.get(doc_id).map(|ctx| ctx.clone()) {
             Some(edit_doc) => Some(edit_doc),
@@ -168,6 +183,27 @@ impl OpenDocHandle {
         Ok(())
     }
 
+    #[tracing::instrument(level = "debug", skip(self, user), err)]
+    async fn apply_ping(
+        &self,
+        doc_id: String,
+        rev_id: i64,
+        user: Arc<dyn RevisionUser>,
+    ) -> Result<(), CollaborateError> {
+        let (ret, rx) = oneshot::channel();
+        self.users.insert(user.user_id(), user.clone());
+        let persistence = self.persistence.clone();
+        let msg = DocumentCommand::Ping {
+            doc_id,
+            user,
+            persistence,
+            rev_id,
+            ret,
+        };
+        let _ = self.send(msg, rx).await?;
+        Ok(())
+    }
+
     async fn send<T>(&self, msg: DocumentCommand, rx: oneshot::Receiver<T>) -> CollaborateResult<T> {
         let _ = self
             .sender
@@ -193,6 +229,13 @@ enum DocumentCommand {
         persistence: Arc<dyn DocumentPersistence>,
         ret: oneshot::Sender<CollaborateResult<()>>,
     },
+    Ping {
+        doc_id: String,
+        user: Arc<dyn RevisionUser>,
+        persistence: Arc<dyn DocumentPersistence>,
+        rev_id: i64,
+        ret: oneshot::Sender<CollaborateResult<()>>,
+    },
 }
 
 struct DocumentCommandQueue {
@@ -248,7 +291,20 @@ impl DocumentCommandQueue {
                     .sync_revisions(doc_id, user, revisions, persistence)
                     .await
                     .map_err(internal_error);
-                log::debug!("handle message {:?}", result);
+                let _ = ret.send(result);
+            },
+            DocumentCommand::Ping {
+                doc_id,
+                user,
+                persistence,
+                rev_id,
+                ret,
+            } => {
+                let result = self
+                    .synchronizer
+                    .pong(doc_id, user, persistence, rev_id)
+                    .await
+                    .map_err(internal_error);
                 let _ = ret.send(result);
             },
         }
@@ -260,3 +316,11 @@ impl std::ops::Drop for DocumentCommandQueue {
         log::debug!("{} DocumentCommandQueue drop", self.doc_id);
     }
 }
+
+fn rev_id_from_str(s: &str) -> Result<i64, CollaborateError> {
+    let rev_id = s
+        .to_owned()
+        .parse::<i64>()
+        .map_err(|e| CollaborateError::internal().context(format!("Parse rev_id from {} failed. {}", s, e)))?;
+    Ok(rev_id)
+}

shared-lib/flowy-collaboration/src/sync/synchronizer.rs

@@ -101,24 +101,33 @@ impl RevisionSynchronizer {
                 // delta.
                 let from_rev_id = first_revision.rev_id;
                 let to_rev_id = server_base_rev_id;
-                let rev_ids: Vec<i64> = (from_rev_id..=to_rev_id).collect();
-                let revisions = match persistence.get_revisions(&self.doc_id, rev_ids).await {
-                    Ok(revisions) => {
-                        assert_eq!(
-                            revisions.is_empty(),
-                            false,
-                            "revisions should not be empty if the doc exists"
-                        );
-                        revisions
-                    },
-                    Err(e) => {
-                        tracing::error!("{}", e);
-                        vec![]
-                    },
-                };
-
-                let data = DocumentServerWSDataBuilder::build_push_message(&self.doc_id, revisions);
-                user.receive(SyncResponse::Push(data));
+                let _ = self.push_revisions_to_user(user, persistence, from_rev_id, to_rev_id);
+            },
+        }
+        Ok(())
+    }
+
+    pub async fn pong(
+        &self,
+        doc_id: String,
+        user: Arc<dyn RevisionUser>,
+        persistence: Arc<dyn DocumentPersistence>,
+        rev_id: i64,
+    ) -> Result<(), CollaborateError> {
+        let server_base_rev_id = self.rev_id.load(SeqCst);
+        match server_base_rev_id.cmp(&rev_id) {
+            Ordering::Less => tracing::error!(
+                "[Pong] Client should not send ping and the server should pull the revisions from the client"
+            ),
+            Ordering::Equal => tracing::debug!("[Pong]: The document:{} is up to date.", doc_id),
+            Ordering::Greater => {
+                // The client document is outdated. Transform the client revision delta and then
+                // send the prime delta to the client. Client should compose the this prime
+                // delta.
+                let from_rev_id = rev_id;
+                let to_rev_id = server_base_rev_id;
+                tracing::trace!("[Pong]: Push revisions to user");
+                let _ = self.push_revisions_to_user(user, persistence, from_rev_id, to_rev_id);
             },
         }
         Ok(())
@@ -154,20 +163,6 @@ impl RevisionSynchronizer {
         Ok(())
     }
 
-    // fn mk_revision(&self, base_rev_id: i64, delta: RichTextDelta) -> Revision {
-    //     let delta_data = delta.to_bytes().to_vec();
-    //     let md5 = md5(&delta_data);
-    //     Revision {
-    //         base_rev_id,
-    //         rev_id: self.rev_id.load(SeqCst),
-    //         delta_data,
-    //         md5,
-    //         doc_id: self.doc_id.to_string(),
-    //         ty: RevType::Remote,
-    //         user_id: "".to_string(),
-    //     }
-    // }
-
     #[allow(dead_code)]
     pub(crate) fn rev_id(&self) -> i64 { self.rev_id.load(SeqCst) }
 
@@ -182,6 +177,33 @@ impl RevisionSynchronizer {
 
         false
     }
+
+    async fn push_revisions_to_user(
+        &self,
+        user: Arc<dyn RevisionUser>,
+        persistence: Arc<dyn DocumentPersistence>,
+        from: i64,
+        to: i64,
+    ) {
+        let rev_ids: Vec<i64> = (from..=to).collect();
+        let revisions = match persistence.get_revisions(&self.doc_id, rev_ids).await {
+            Ok(revisions) => {
+                assert_eq!(
+                    revisions.is_empty(),
+                    false,
+                    "revisions should not be empty if the doc exists"
+                );
+                revisions
+            },
+            Err(e) => {
+                tracing::error!("{}", e);
+                vec![]
+            },
+        };
+
+        let data = DocumentServerWSDataBuilder::build_push_message(&self.doc_id, revisions);
+        user.receive(SyncResponse::Push(data));
+    }
 }
 
 #[inline]

shared-lib/flowy-core-data-model/src/entities/view/view_create.rs

@@ -97,8 +97,6 @@ impl CreateViewParams {
             view_id,
         }
     }
-
-    pub fn take_view_data(&mut self) -> String { std::mem::take(&mut self.view_data) }
 }
 
 impl TryInto<CreateViewParams> for CreateViewRequest {