search

walkor / GatewayWorker

Distributed realtime messaging framework based on workerman.
MIT License
1.01k stars 296 forks source link

Client Id #17

Closed sm2017 closed 7 years ago

sm2017 commented 7 years ago

I want to know how clientId is generated?

Is it unique in multiple server ( Distributed Deployment )? that means If we have 3 server and I have clientId A in server 1 , is it possible some one or me have A as client id in server 2 or 3 ?

Is it unique in time , that means If my clientId is B and I close connection is it possible later some one or me have B as client id?

walkor commented 7 years ago

Here are the codes to generate clientId in Lib/Context.php.

$client_id = bin2hex(pack('NnN', $local_ip, $local_port, $connection_id));

$locol_ip is $gateway->localIp(defined in start_gateway.php) witch is unique in your server clusters.

$local_port is internal communication port(related $gateway->startPort in start_gateway.php) witch is unique for every gateway process in one server.

$connection_id is the real socket id in gateway process witch is self-increasing when connection coming and is unique in one gateway process. The max value for $connection_id is 4294967295 (unsigned int), and connection_id will be set to 1 again when it reached the max value, this will not be happen in several tens of years.

So, clientId is unique in multiple server ( Distributed Deployment )

When a clientId is used the clientId will not be used again for a long time(several tens of years or even longer) in runtime.

sm2017 commented 7 years ago

Ok , Thanks