Error on null page/scope

src/cdp/cdp.zig

@@ -377,7 +377,7 @@ pub fn BrowserContext(comptime CDP_T: type) type {
 
             self.isolated_world = .{
                 .name = try self.arena.dupe(u8, world_name),
-                .scope = undefined,
+                .scope = null,
                 .executor = executor,
                 .grant_universal_access = grant_universal_access,
             };
@@ -519,7 +519,8 @@ const IsolatedWorld = struct {
         self.executor.deinit();
         self.scope = null;
     }
-    pub fn removeContext(self: *IsolatedWorld) void {
+    pub fn removeContext(self: *IsolatedWorld) !void {
+        if (self.scope == null) return error.NoIsolatedContextToRemove;
         self.executor.endScope();
         self.scope = null;
     }
@@ -530,6 +531,7 @@ const IsolatedWorld = struct {
     // This also means this pointer becomes invalid after removePage untill a new page is created.
     // Currently we have only 1 page/frame and thus also only 1 state in the isolate world.
     pub fn createContext(self: *IsolatedWorld, page: *Page) !void {
+        if (self.scope != null) return error.Only1IsolatedContextSupported;
         self.scope = try self.executor.startScope(&page.window, &page.state, {}, false);
     }
 };

src/cdp/domains/page.zig

@@ -114,7 +114,7 @@ fn createIsolatedWorld(cmd: anytype) !void {
     const bc = cmd.browser_context orelse return error.BrowserContextNotLoaded;
 
     const world = try bc.createIsolatedWorld(params.worldName, params.grantUniveralAccess);
-    const page = bc.session.currentPage().?;
+    const page = bc.session.currentPage() orelse return error.PageNotLoaded;
     try pageCreated(bc, page);
     const scope = world.scope.?;
 
@@ -147,7 +147,7 @@ fn navigate(cmd: anytype) !void {
 
     const url = try URL.parse(params.url, "https");
 
-    var page = bc.session.currentPage().?;
+    var page = bc.session.currentPage() orelse return error.PageNotLoaded;
     bc.loader_id = bc.cdp.loader_id_gen.next();
     try cmd.sendResult(.{
         .frameId = target_id,
@@ -223,7 +223,7 @@ pub fn pageNavigate(bc: anytype, event: *const Notification.PageNavigate) !void
     var buffer: [512]u8 = undefined;
     {
         var fba = std.heap.FixedBufferAllocator.init(&buffer);
-        const page = bc.session.currentPage().?;
+        const page = bc.session.currentPage() orelse return error.PageNotLoaded;
         const aux_data = try std.fmt.allocPrint(fba.allocator(), "{{\"isDefault\":true,\"type\":\"default\",\"frameId\":\"{s}\"}}", .{target_id});
         bc.inspector.contextCreated(
             page.scope,
@@ -249,7 +249,7 @@ pub fn pageNavigate(bc: anytype, event: *const Notification.PageNavigate) !void
 pub fn pageRemove(bc: anytype) !void {
     // The main page is going to be removed, we need to remove contexts from other worlds first.
     if (bc.isolated_world) |*isolated_world| {
-        isolated_world.removeContext();
+        try isolated_world.removeContext();
     }
 }