sqlite: cleanup ERM support and export Session class

Update sqlite Session to support Symbol.dispose and
move the definition of the dispose methods to c++ to
close the open TODO

Author: jasnell

lib/sqlite.js

@@ -1,19 +1,6 @@
 'use strict';
-const {
-  SymbolDispose,
-} = primordials;
 const { emitExperimentalWarning } = require('internal/util');
-const binding = internalBinding('sqlite');
 
 emitExperimentalWarning('SQLite');
 
-// TODO(cjihrig): Move this to C++ once Symbol.dispose reaches Stage 4.
-binding.DatabaseSync.prototype[SymbolDispose] = function() {
-  try {
-    this.close();
-  } catch {
-    // Ignore errors.
-  }
-};
-
-module.exports = binding;
+module.exports = internalBinding('sqlite');

src/node_sqlite.cc

@@ -1000,6 +1000,14 @@ void DatabaseSync::Close(const FunctionCallbackInfo<Value>& args) {
   db->connection_ = nullptr;
 }
 
+void DatabaseSync::Dispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  v8::TryCatch try_catch(args.GetIsolate());
+  Close(args);
+  if (try_catch.HasCaught()) {
+    CHECK(try_catch.CanContinue());
+  }
+}
+
 void DatabaseSync::Prepare(const FunctionCallbackInfo<Value>& args) {
   DatabaseSync* db;
   ASSIGN_OR_RETURN_UNWRAP(&db, args.This());
@@ -2572,6 +2580,7 @@ Local<FunctionTemplate> Session::GetConstructorTemplate(Environment* env) {
     SetProtoMethod(
         isolate, tmpl, "patchset", Session::Changeset<sqlite3session_patchset>);
     SetProtoMethod(isolate, tmpl, "close", Session::Close);
+    SetProtoDispose(isolate, tmpl, Session::Dispose);
     env->set_sqlite_session_constructor_template(tmpl);
   }
   return tmpl;
@@ -2616,6 +2625,14 @@ void Session::Close(const FunctionCallbackInfo<Value>& args) {
   session->Delete();
 }
 
+void Session::Dispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  v8::TryCatch try_catch(args.GetIsolate());
+  Close(args);
+  if (try_catch.HasCaught()) {
+    CHECK(try_catch.CanContinue());
+  }
+}
+
 void Session::Delete() {
   if (!database_ || !database_->connection_ || session_ == nullptr) return;
   sqlite3session_delete(session_);
@@ -2651,6 +2668,7 @@ static void Initialize(Local<Object> target,
 
   SetProtoMethod(isolate, db_tmpl, "open", DatabaseSync::Open);
   SetProtoMethod(isolate, db_tmpl, "close", DatabaseSync::Close);
+  SetProtoDispose(isolate, db_tmpl, DatabaseSync::Dispose);
   SetProtoMethod(isolate, db_tmpl, "prepare", DatabaseSync::Prepare);
   SetProtoMethod(isolate, db_tmpl, "exec", DatabaseSync::Exec);
   SetProtoMethod(isolate, db_tmpl, "function", DatabaseSync::CustomFunction);
@@ -2681,6 +2699,8 @@ static void Initialize(Local<Object> target,
                          target,
                          "StatementSync",
                          StatementSync::GetConstructorTemplate(env));
+  SetConstructorFunction(
+      context, target, "Session", Session::GetConstructorTemplate(env));
 
   target->Set(context, env->constants_string(), constants).Check();
 

src/node_sqlite.h

@@ -64,6 +64,7 @@ class DatabaseSync : public BaseObject {
   static void IsTransactionGetter(
       const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Close(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void Dispose(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Prepare(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Exec(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Location(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ -194,6 +195,7 @@ class Session : public BaseObject {
   template <Sqlite3ChangesetGenFunc sqliteChangesetFunc>
   static void Changeset(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Close(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void Dispose(const v8::FunctionCallbackInfo<v8::Value>& args);
   static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(
       Environment* env);
   static BaseObjectPtr<Session> Create(Environment* env,

src/util.cc

@@ -598,6 +598,32 @@ void SetMethodNoSideEffect(Isolate* isolate,
   that->Set(name_string, t);
 }
 
+void SetProtoDispose(v8::Isolate* isolate,
+                     v8::Local<v8::FunctionTemplate> that,
+                     v8::FunctionCallback callback) {
+  Local<v8::Signature> signature = v8::Signature::New(isolate, that);
+  Local<v8::FunctionTemplate> t =
+      NewFunctionTemplate(isolate,
+                          callback,
+                          signature,
+                          v8::ConstructorBehavior::kThrow,
+                          v8::SideEffectType::kHasSideEffect);
+  that->PrototypeTemplate()->Set(v8::Symbol::GetDispose(isolate), t);
+}
+
+void SetProtoAsyncDispose(v8::Isolate* isolate,
+                          v8::Local<v8::FunctionTemplate> that,
+                          v8::FunctionCallback callback) {
+  Local<v8::Signature> signature = v8::Signature::New(isolate, that);
+  Local<v8::FunctionTemplate> t =
+      NewFunctionTemplate(isolate,
+                          callback,
+                          signature,
+                          v8::ConstructorBehavior::kThrow,
+                          v8::SideEffectType::kHasSideEffect);
+  that->PrototypeTemplate()->Set(v8::Symbol::GetAsyncDispose(isolate), t);
+}
+
 void SetProtoMethod(v8::Isolate* isolate,
                     Local<v8::FunctionTemplate> that,
                     const std::string_view name,

src/util.h

@@ -926,6 +926,16 @@ void SetMethodNoSideEffect(v8::Isolate* isolate,
                            const std::string_view name,
                            v8::FunctionCallback callback);
 
+// Set the Symbol.dispose method on the prototype of the class.
+void SetProtoDispose(v8::Isolate* isolate,
+                     v8::Local<v8::FunctionTemplate> that,
+                     v8::FunctionCallback callback);
+
+// Set the Symbol.asyncDispose method on the prototype of the class.
+void SetProtoAsyncDispose(v8::Isolate* isolate,
+                          v8::Local<v8::FunctionTemplate> that,
+                          v8::FunctionCallback callback);
+
 enum class SetConstructorFunctionFlag {
   NONE,
   SET_CLASS_NAME,

test/parallel/test-sqlite-session.js

@@ -539,3 +539,18 @@ test('session.close() - closing twice', (t) => {
     message: 'session is not open'
   });
 });
+
+test('session supports ERM', (t) => {
+  const database = new DatabaseSync(':memory:');
+  let afterDisposeSession;
+  {
+    using session = database.createSession();
+    afterDisposeSession = session;
+    const changeset = session.changeset();
+    t.assert.ok(changeset instanceof Uint8Array);
+    t.assert.strictEqual(changeset.length, 0);
+  }
+  t.assert.throws(() => afterDisposeSession.changeset(), {
+    message: /session is not open/,
+  });
+});