TypeError: Cannot assign null to property Basis\\Nats\\Connection::$infoMessage of type Basis\\Nats\\Message\\Info in /var/www/app/vendor/basis-company/nats/src/Connection.php:202

[webspec2012]

No description provided.

[kolyan-r]

Hello, this error will occur if the client connects to a server that does not support the Nats protocol, since in the Nats protocol the server must send a special message with information about the connection when connecting

This error will also occur if the server does not respond within the allotted time with an information message after initializing the TCP connection

But there is a bug in the code with the processing of the information message, which can clearly be of type null and is assigned to an attribute that cannot be null

# telnet localhost 4222
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
INFO {"server_id":"NBDH32DTZDVFYXP4MNYQZPAFUDSSJWJH23KYOWSEPSPT6K5LTFPX36BN","server_name":"NBDH32DTZDVFYXP4MNYQZPAFUDSSJWJH23KYOWSEPSPT6K5LTFPX36BN","version":"2.10.18","proto":1,"git_commit":"57d23ac","go":"go1.22.5","host":"0.0.0.0","port":4222,"headers":true,"max_payload":1048576,"client_id":13,"client_ip":"172.16.15.1","cluster":"NATS","connect_urls":["172.16.15.2:4222","172.16.15.3:4222","172.16.15.4:4222"],"xkey":"XAGJSQJ7GFMN4PVB6HW366RII7DMIH44HY7HM6HVZIMQLPXHNFMVK44B"}
^]
telnet> quit
Connection closed.

src/Connection.php

Bad code:

$this->infoMessage = $this->getMessage($config->timeout);
assert($this->infoMessage instanceof Info);

Fix option:

$infoMessage = $this->getMessage($config->timeout);

if(! $infoMessage) {
    throw new Exception('INFO message from the server was not received');
}

assert($infoMessage instanceof Info);
$this->infoMessage = $infoMessage;

[nekufa]

hi @kolyan-r, would you like to make merge request?