Hi, I am digging in the Mojo::Pg::PubSub possibilities, to use multiple
channels, and I would like to fully understand data contained in this
variable: $pubsub
# Forward messages from PostgreSQL to the browser
my $cb = sub ($pubsub, $message) { $c->send($message) };
$c->pg->pubsub->listen(mojochat => $cb);
This code excerpt comes from Joel Berger Vuechat, a great example I have
used to learn
(https://github.com/jberger/VueChat/blob/master/ex/vue_chat_comp.pl)
At first I thought that $pubsub was part of the response from PostgreSQL,
along with $message, so I printed a Dump:
$VAR1 = bless( {
'json' => {},
'chans' => {
'mojochat2' => [
sub { "DUMMY" },
sub { "DUMMY" }
],
'mojochat' => [
sub { "DUMMY" },
sub { "DUMMY" },
sub { "DUMMY" },
sub { "DUMMY" },
sub { "DUMMY" }
]
},
'pg' => bless( {
'pubsub' => $VAR1,
'password' => '********',
'database_class' => 'Mojo::Pg::Database',
'events' => {},
'username' => '********',
'dsn' =>
'dbi:Pg:dbname=********;host=********',
'pid' => 30059,
'options' => {
'RaiseError' => 1,
'AutoInactiveDestroy' => 1,
'AutoCommit' => 1,
'PrintError' => 0,
'PrintWarn' => 0
}
}, 'Mojo::Pg' ),
'events' => {
'disconnect' => [
sub { "DUMMY" }
]
},
'db' => bless( {
'events' => {
'close' => [
sub { "DUMMY" }
],
'notification' => [
sub {
"DUMMY" }
]
},
'pg' => $VAR1->{'pg'},
'dbh' => bless( {}, 'DBI::db' ),
'handle' =>
\*Mojo::Pg::Database::__ANONIO__,
'listen' => {
'mojochat' => 2,
'mojochat2' => 1,
'mojo.pubsub' => 1
},
'watching' => 1
}, 'Mojo::Pg::Database' )
}, 'Mojo::Pg::PubSub' );
Now I see that $pubsub is not coming from PostgreSQL. It is the current
object from Mojolicious PubSub.
In 'chans' I can see all the current channels (mojochat and mojochat2).
Both have an array of current connections, and all the elements are exactly
the same: 'sub { "DUMMY" }'.
So, when using Hypnotoad, each Worker will have its own arrays. Am I right?
I was trying to get the number of connected users, but they will be
scattered through all the Workers, and I don't know how to access each
worker.
I was also trying to find a way to send a message exclusively to one user,
but the first step, before anything else, is to have an Id for each
connection, and I only have "DUMMY".
It should be great if someone walks me through this.
Regards:
Nacho B.
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