Merge pull request #1071 from mapbox/1071-sqlite-avoid-crash

Gracefully handle SQLite errors

include/mbgl/platform/log.hpp

@@ -4,6 +4,7 @@
 #include <mbgl/platform/event.hpp>
 
 #include <mbgl/util/std.hpp>
+#include <mbgl/util/noncopyable.hpp>
 
 #include <memory>
 #include <string>
@@ -12,7 +13,7 @@ namespace mbgl {
 
 class Log {
 public:
-    class Observer {
+    class Observer : private util::noncopyable {
     public:
         virtual ~Observer() = default;
 
@@ -22,6 +23,7 @@ public:
     };
 
     static void setObserver(std::unique_ptr<Observer> Observer);
+    static std::unique_ptr<Observer> removeObserver();
 
 private:
     template <typename T, size_t N>

include/mbgl/storage/default/sqlite_cache.hpp

@@ -38,6 +38,7 @@ private:
     void process(StopAction &action);
 
     void createDatabase();
+    void createSchema();
 
     const std::string path;
     uv_loop_t *loop = nullptr;
@@ -45,6 +46,7 @@ private:
     std::thread thread;
     std::unique_ptr<::mapbox::sqlite::Database> db;
     std::unique_ptr<::mapbox::sqlite::Statement> getStmt, putStmt, refreshStmt;
+    bool schema = false;
 };
 
 }