Hook up the new system

Session/Closed Groups/EditClosedGroupVC.swift

@@ -263,9 +263,9 @@ final class EditClosedGroupVC : BaseVC, UITableViewDataSource, UITableViewDelega
         Storage.write(with: { [weak self] transaction in
             do {
                 if !members.contains(getUserHexEncodedPublicKey()) {
-                    try MessageSender.leave(groupPublicKey, using: transaction)
+                    try MessageSender.v2_leave(groupPublicKey, using: transaction)
                 } else {
-                    try MessageSender.update(groupPublicKey, with: members, name: name, transaction: transaction)
+                    try MessageSender.v2_update(groupPublicKey, with: members, name: name, transaction: transaction)
                 }
             } catch {
                 DispatchQueue.main.async {

Session/Conversations/OWSConversationSettingsViewController.m

@@ -939,7 +939,7 @@ static CGRect oldframe;
     if (gThread.isClosedGroup) {
         NSString *groupPublicKey = [LKGroupUtilities getDecodedGroupID:gThread.groupModel.groupId];
         [LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *_Nonnull transaction) {
-            [SNMessageSender leaveClosedGroupWithPublicKey:groupPublicKey using:transaction error:nil];
+            [SNMessageSender v2_leaveClosedGroupWithPublicKey:groupPublicKey using:transaction error:nil];
         }];
     }
 

Session/Home/HomeVC.swift

@@ -379,7 +379,7 @@ final class HomeVC : BaseVC, UITableViewDataSource, UITableViewDelegate, UIViewC
                         let groupID = thread.groupModel.groupId
                         let groupPublicKey = LKGroupUtilities.getDecodedGroupID(groupID)
                         do {
-                            try MessageSender.leave(groupPublicKey, using: transaction)
+                            try MessageSender.v2_leave(groupPublicKey, using: transaction)
                         } catch {
                             // TODO: Handle
                         }

SessionMessagingKit/Sending & Receiving/MessageSender+ClosedGroups.swift

@@ -78,6 +78,25 @@ extension MessageSender {
         }
     }
     
+    public static func v2_update(_ groupPublicKey: String, with members: Set<String>, name: String, transaction: YapDatabaseReadWriteTransaction) throws {
+        // Get the group, check preconditions & prepare
+        let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
+        let threadID = TSGroupThread.threadId(fromGroupId: groupID)
+        guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
+            SNLog("Can't update nonexistent closed group.")
+            throw Error.noThread
+        }
+        let group = thread.groupModel
+        // Update name if needed
+        if name != group.groupName { setName(to: name, for: groupPublicKey, using: transaction) }
+        // Add members if needed
+        let addedMembers = members.subtracting(group.groupMemberIds)
+        if !addedMembers.isEmpty { addMembers(addedMembers, to: groupPublicKey, using: transaction) }
+        // Remove members if needed
+        let removedMembers = Set(group.groupMemberIds).subtracting(members)
+        if !removedMembers.isEmpty { removeMembers(addedMembers, to: groupPublicKey, using: transaction) }
+    }
+    
     public static func setName(to name: String, for groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
         // Get the group, check preconditions & prepare
         let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)