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        }
        else {
            $cb->($hdr->{Status} . ': ' . $hdr->{Reason});
        }
    }
    else {
        debugf 'on_error callback does not set';
        critf "res:%s hdr:%s", ddf($res), ddf($hdr);
    }
}

sub start_session {
    my ($self) = @_;

    debugf "starting session...";

    if ($self->session) {
        debugf "found old session:%s reusing...", $self->session;

        $self->get('session/verify', { session => $self->session }, sub {
            my ($res, $hdr) = @_;
            return unless $self;

            if ($res and $res->{status} eq 'ok') {
                infof "session verified: %s", $res->{session};
                $self->_get_channels;
            }
            else {
                debugf "session verify failed: %s", ddf($res || $hdr);
                $self->session(undef);
                $self->_on_error($res, $hdr);
            }
        });
    }
    else {
        debugf "create new session...";

        $self->post('session/create', {
            user     => $self->user,
            password => $self->password,
            $self->api_key ? (api_key => $self->api_key) : (),
        }, sub {
            my ($res, $hdr) = @_;
            return unless $self;

            if ($res and $res->{status} eq 'ok') {
                debugf "session created: %s", $res->{session};
                $self->session( $res->{session} );
                $self->_get_channels;
            }
            else {
                debugf "session create failed: %s", ddf($res || $hdr);
                $self->_on_error($res, $hdr);
            }
        });
    }

    Scalar::Util::weaken($self);
}

sub update_room_info {
    my ($self) = @_;
    $self->_get_channels;
}

sub _get_channels {
    my ($self) = @_;

    debugf "getting joined channels";

    $self->get('user/get_rooms', { session => $self->session }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            debugf "got rooms: %s", ddf($res->{rooms});
            $self->_update_room_info( $res->{rooms} );
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });
    Scalar::Util::weaken($self);
}

sub _update_room_info {
    my ($self, $rooms) = @_;

    $self->get('room/show', { session => $self->session, room => join ',', @{ $rooms } }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            debugf "got room infos";
            if ($self->on_room_info) {
                $self->on_room_info->($res->{rooms});
            }
            else {
                debugf "no room info callback";
            }

            $self->_start_observe($rooms);
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });
    Scalar::Util::weaken($self);
}

sub _start_observe {
    my ($self, $rooms) = @_;

    $self->post('room/subscribe', {
        session => $self->session,
        rooms   => join(',', @$rooms),
        reset   => 1,
    }, sub {
        my ($res, $hdr) = @_;
        return unless $self;