Deal with non-existing index

2 files changed, 8 insertions, 0 deletions

diff --git a/common/index.cpp b/common/index.cpp
index 9bb467b..a8de697 100644
--- a/common/index.cpp
+++ b/common/index.cpp
@@ -17,6 +17,10 @@ void Index::add(const QByteArray &key, const QByteArray &value)
 void Index::lookup(const QByteArray &key, const std::function<void(const QByteArray &value)> &resultHandler,
                                           const std::function<void(const Error &error)> &errorHandler)
 {
+    if (!mStorage.exists()) {
+        errorHandler(Error("index", IndexNotAvailable, "Index not existing"));
+        return;
+    }
     mStorage.scan(key, [this, resultHandler](void *keyPtr, int keySize, void *valuePtr, int valueSize) -> bool {
         resultHandler(QByteArray(static_cast<char*>(valuePtr), valueSize));
         return true;
diff --git a/common/index.h b/common/index.h
index 3cd7cc8..08b499f 100644
--- a/common/index.h
+++ b/common/index.h
@@ -11,6 +11,10 @@
 class Index
 {
 public:
+    enum ErrorCodes {
+        IndexNotAvailable = -1
+    };
+
     class Error
     {
     public: