static Napi::FunctionReference constructor;

static Napi::Object Init(Napi::Env env, Napi::Object exports);

static inline bool HasInstance(Napi::Value val) {

Napi::Env env = val.Env();

Napi::HandleScope scope(env);

if (!val.IsObject()) return false;

Napi::Object obj = val.As<Napi::Object>();

return obj.InstanceOf(constructor.Value());

}

struct Baton {

napi_async_work request;

Database* db;

Napi::FunctionReference callback;

int status;

std::string message;

Baton(Database* db_, Napi::Function cb_) :

db(db_), status(SQLITE_OK) {

db->Ref();

if (!cb_.IsUndefined() && cb_.IsFunction()) {

callback.Reset(cb_, 1);

}

}

virtual ~Baton() {

db->Unref();

callback.Reset();

}

};

struct OpenBaton : Baton {

std::string filename;

int mode;

OpenBaton(Database* db_, Napi::Function cb_, const char* filename_, int mode_) :

Baton(db_, cb_), filename(filename_), mode(mode_) {}

};

struct ExecBaton : Baton {

std::string sql;

ExecBaton(Database* db_, Napi::Function cb_, const char* sql_) :

Baton(db_, cb_), sql(sql_) {}

};

struct LoadExtensionBaton : Baton {

std::string filename;

LoadExtensionBaton(Database* db_, Napi::Function cb_, const char* filename_) :

Baton(db_, cb_), filename(filename_) {}

};

typedef void (*Work_Callback)(Baton* baton);

struct Call {

Call(Work_Callback cb_, Baton* baton_, bool exclusive_ = false) :

callback(cb_), exclusive(exclusive_), baton(baton_) {};

Work_Callback callback;

bool exclusive;

Baton* baton;

};

struct ProfileInfo {

std::string sql;

sqlite3_int64 nsecs;

};

struct UpdateInfo {

int type;

std::string database;

std::string table;

sqlite3_int64 rowid;

};

bool IsOpen() { return open; }

bool IsLocked() { return locked; }

typedef Async<std::string, Database> AsyncTrace;

typedef Async<ProfileInfo, Database> AsyncProfile;

typedef Async<UpdateInfo, Database> AsyncUpdate;

friend class Statement;

friend class Backup;

void init() {

_handle = NULL;

open = false;

closing = false;

locked = false;

pending = 0;

serialize = false;

debug_trace = NULL;

debug_profile = NULL;

update_event = NULL;

}

Database(const Napi::CallbackInfo& info);

~Database() {

RemoveCallbacks();

sqlite3_close(_handle);

_handle = NULL;

open = false;

}

static void Work_BeginOpen(Baton* baton);

static void Work_Open(napi_env env, void* data);

static void Work_AfterOpen(napi_env env, napi_status status, void* data);

Napi::Value OpenGetter(const Napi::CallbackInfo& info);

void Schedule(Work_Callback callback, Baton* baton, bool exclusive = false);

void Process();

Napi::Value Exec(const Napi::CallbackInfo& info);

static void Work_BeginExec(Baton* baton);

static void Work_Exec(napi_env env, void* data);

static void Work_AfterExec(napi_env env, napi_status status, void* data);

Napi::Value Wait(const Napi::CallbackInfo& info);

static void Work_Wait(Baton* baton);

Napi::Value Close(const Napi::CallbackInfo& info);

static void Work_BeginClose(Baton* baton);

static void Work_Close(napi_env env, void* data);

static void Work_AfterClose(napi_env env, napi_status status, void* data);

Napi::Value LoadExtension(const Napi::CallbackInfo& info);

static void Work_BeginLoadExtension(Baton* baton);

static void Work_LoadExtension(napi_env env, void* data);

static void Work_AfterLoadExtension(napi_env env, napi_status status, void* data);

Napi::Value Serialize(const Napi::CallbackInfo& info);

Napi::Value Parallelize(const Napi::CallbackInfo& info);

Napi::Value Configure(const Napi::CallbackInfo& info);

Napi::Value Interrupt(const Napi::CallbackInfo& info);

static void SetBusyTimeout(Baton* baton);

static void RegisterTraceCallback(Baton* baton);

static void TraceCallback(void* db, const char* sql);

static void TraceCallback(Database* db, std::string* sql);

static void RegisterProfileCallback(Baton* baton);

static void ProfileCallback(void* db, const char* sql, sqlite3_uint64 nsecs);

static void ProfileCallback(Database* db, ProfileInfo* info);

static void RegisterUpdateCallback(Baton* baton);

static void UpdateCallback(void* db, int type, const char* database, const char* table, sqlite3_int64 rowid);

static void UpdateCallback(Database* db, UpdateInfo* info);

void RemoveCallbacks();

sqlite3* _handle;

bool open;

bool closing;

bool locked;

unsigned int pending;

bool serialize;

std::queue<Call*> queue;

AsyncTrace* debug_trace;

AsyncProfile* debug_profile;

AsyncUpdate* update_event;