cogctl communication to multiple instances does not work

[ventosus]

With two cog instances (built with system DBUS):

cog --gapplication-app-id=com.example.ONE uri
cog --gapplication-app-id=com.example.TWO uri

There is no way to talk to both of them with cogctl by using the object path: (only the first one loaded can be talked to)

cogctl --system --object-path=/com/example/ONE reload -> OK

cogctl --system --object-path=/com/example/TWO reload
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: Object does not exist at path ?/com/example/TWO?

There is no way to talk to both of them with cogctl by using the appid:

cogctl --system --appid=com.example.ONE reload
GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "com.example.ONE" does not exist

cogctl --system --appid=com.example.TWO reload
GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "com.example.TWO" does not exist

How should I talk to different cog instances? Am I doing something wrong?

[ventosus]

# cog --version
0.12.4 (WPE WebKit 2.36.3)

[chrisvollorenew]

Hello @ventosus - I also have been having trouble with cogctl and dbus.
I wonder if theres something I am missing with my set up.
I am running cog as root in an embedded environment.
The system bus is at /run/dbus/...
The environment variables for dbus are not getting set "automatically" in my case.
Have you tried checking your environment variables (such as DBUS_SYSTEM_BUS_ADDRESS) for dbus?

Please find my post here:
#532

[ventosus]

@chrisvollorenew dbus ist set up just fine on my side. my problem is addressing multiple instances of cog. addressing a single instance works just fine.

[aperezdc]

The same identifiers passed to cog --gapplication-app-id= must be passed to cogctl --appid=:

# Start two instances with different application identifiers
cog --gapplication-app-id=com.example.Cog1 wpewebkit.org
cog --gapplication-app-id=com.example.Cog2 igalia.com
# Load different pages on each using cogctl
cogctl --appid=com.example.Cog1 open webkit.org
cogctl --appid=com.example.Cog2 open apple.com

You can see this in action in the screenshot below (note that -A is the same as --appid=):

[aperezdc]

Elaborating further, the error:

GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "com.example.TWO" does not exist

means that cogctl has been able to connect to D-Bus (connection error has not been reported), but the control interface has not been registered by Cog in the bus accessed by cogctl. Please make sure that:

• Cog can itself can access D-Bus. Unfortunately GLib doesn't warn when the control interface wasn't registered to the session bus (on the other hand, Cog warns when failing to register to the system bus—note that we recommend using the session bus regardless of this).
• Both Cog and cogctl are using the same bus (system bus, or session bus of the same user).

[ventosus]

Please see my initial report, I'm using the system bus. There it still does not work. Can you reproduce on the system bus, please?

# cog --version
0.16.1 (WPE WebKit 2.38.5)

[daydaychen]

Maybe your dbus-daemon program isn't starting? Check if this file /run/usr/<user_id>/bus exists

[woutervanh]

Was indeed not working on system bus, as the passed appid was not parsed yet when setting up the bus, so registering with default name com.igalia.Cog in stead of the desired name.
Fixed and created pull request: #762

[aperezdc]

Thanks! The fix was merged a few days ago.