Set and check the sqlite user version

Author: achow101

src/wallet/sqlite.cpp

@@ -18,6 +18,7 @@
 #include <stdint.h>
 
 static const char* const DATABASE_FILENAME = "wallet.dat";
+static constexpr int32_t WALLET_SCHEMA_VERSION = 0;
 
 static Mutex g_sqlite_mutex;
 static int g_sqlite_count GUARDED_BY(g_sqlite_mutex) = 0;
@@ -137,6 +138,27 @@ bool SQLiteDatabase::Verify(bilingual_str& error)
         return false;
     }
 
+    // Check our schema version
+    sqlite3_stmt* user_ver_stmt{nullptr};
+    ret = sqlite3_prepare_v2(m_db, "PRAGMA user_version", -1, &user_ver_stmt, nullptr);
+    if (ret != SQLITE_OK) {
+        sqlite3_finalize(user_ver_stmt);
+        error = strprintf(_("SQLiteDatabase: Failed to prepare the statement to fetch sqlite wallet schema version: %s"), sqlite3_errstr(ret));
+        return false;
+    }
+    ret = sqlite3_step(user_ver_stmt);
+    if (ret != SQLITE_ROW) {
+        sqlite3_finalize(user_ver_stmt);
+        error = strprintf(_("SQLiteDatabase: Failed to fetch sqlite wallet schema version: %s"), sqlite3_errstr(ret));
+        return false;
+    }
+    int32_t user_ver = sqlite3_column_int(user_ver_stmt, 0);
+    sqlite3_finalize(user_ver_stmt);
+    if (user_ver != WALLET_SCHEMA_VERSION) {
+        error = strprintf(_("SQLiteDatabase: Unknown sqlite wallet schema version %d. Only version %d is supported"), user_ver, WALLET_SCHEMA_VERSION);
+        return false;
+    }
+
     sqlite3_stmt* stmt{nullptr};
     ret = sqlite3_prepare_v2(m_db, "PRAGMA integrity_check", -1, &stmt, nullptr);
     if (ret != SQLITE_OK) {
@@ -246,6 +268,13 @@ void SQLiteDatabase::Open()
         if (ret != SQLITE_OK) {
             throw std::runtime_error(strprintf("SQLiteDatabase: Failed to set the application id: %s\n", sqlite3_errstr(ret)));
         }
+
+        // Set the user version
+        std::string set_user_ver = strprintf("PRAGMA user_version = %d", WALLET_SCHEMA_VERSION);
+        ret = sqlite3_exec(m_db, set_user_ver.c_str(), nullptr, nullptr, nullptr);
+        if (ret != SQLITE_OK) {
+            throw std::runtime_error(strprintf("SQLiteDatabase: Failed to set the wallet schema version: %s\n", sqlite3_errstr(ret)));
+        }
     }
 }