From 477f7b1f33843becacbbbee4704206357a783907 Mon Sep 17 00:00:00 2001
From: Ari Lazier <alazier@gmail.com>
Date: Thu, 5 May 2016 19:39:50 -0700
Subject: [PATCH] add hook for detecting file format upgrade

---
 src/shared_realm.cpp | 15 ++++++++++-----
 src/shared_realm.hpp |  7 +++++--
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/shared_realm.cpp b/src/shared_realm.cpp
index bdc2b1fd..bff52bce 100644
--- a/src/shared_realm.cpp
+++ b/src/shared_realm.cpp
@@ -43,13 +43,15 @@ Realm::Config::Config(const Config& c)
 , cache(c.cache)
 , disable_format_upgrade(c.disable_format_upgrade)
 , automatic_change_notifications(c.automatic_change_notifications)
+, upgrade_final_version(0)
+, upgrade_initial_version(0)
 {
     if (c.schema) {
         schema = std::make_unique<Schema>(*c.schema);
     }
 }
 
-Realm::Config::Config() : schema_version(ObjectStore::NotVersioned) { }
+Realm::Config::Config() : schema_version(ObjectStore::NotVersioned), upgrade_initial_version(0), upgrade_final_version(0) { }
 Realm::Config::Config(Config&&) = default;
 Realm::Config::~Config() = default;
 
@@ -71,7 +73,7 @@ Realm::Realm(Config config)
     }
 }
 
-void Realm::open_with_config(const Config& config,
+void Realm::open_with_config(Config& config,
                              std::unique_ptr<Replication>& history,
                              std::unique_ptr<SharedGroup>& shared_group,
                              std::unique_ptr<Group>& read_only_group)
@@ -85,9 +87,12 @@ void Realm::open_with_config(const Config& config,
                 throw InvalidEncryptionKeyException();
             }
             history = realm::make_client_history(config.path, config.encryption_key.data());
-            SharedGroup::DurabilityLevel durability = config.in_memory ? SharedGroup::durability_MemOnly :
-                                                                           SharedGroup::durability_Full;
-            shared_group = std::make_unique<SharedGroup>(*history, durability, config.encryption_key.data(), !config.disable_format_upgrade);
+            SharedGroup::DurabilityLevel durability = config.in_memory ? SharedGroup::durability_MemOnly : SharedGroup::durability_Full;
+            shared_group = std::make_unique<SharedGroup>(*history, durability, config.encryption_key.data(), !config.disable_format_upgrade,
+                                                         [&](int from_version, int to_version) {
+                config.upgrade_initial_version = from_version;
+                config.upgrade_final_version = to_version;
+            });
         }
     }
     catch (util::File::PermissionDenied const& ex) {
diff --git a/src/shared_realm.hpp b/src/shared_realm.hpp
index ecd1efae..20cb630c 100644
--- a/src/shared_realm.hpp
+++ b/src/shared_realm.hpp
@@ -82,7 +82,10 @@ namespace realm {
             // everything can be done deterministically on one thread, and
             // speeds up tests that don't need notifications.
             bool automatic_change_notifications = true;
-
+            // File format versions populated when a file format updrade takes place
+            // during realm opening
+            int upgrade_initial_version, upgrade_final_version;
+            
             Config();
             Config(Config&&);
             Config(const Config& c);
@@ -156,7 +159,7 @@ namespace realm {
             static _impl::RealmCoordinator& get_coordinator(Realm& realm) { return *realm.m_coordinator; }
         };
 
-        static void open_with_config(const Config& config,
+        static void open_with_config(Config& config,
                                      std::unique_ptr<Replication>& history,
                                      std::unique_ptr<SharedGroup>& shared_group,
                                      std::unique_ptr<Group>& read_only_group);