config/database.php redis prefix question

[xiaohuilam]

• Laravel Version: 5.8.x
• PHP Version: 7.2

Description:

https://github.com/laravel/laravel/blob/da83285/config/database.php#L126 this config/database.php Redis prefix line, is a hard-code un-customizable prefix (not in .env at least), to set a for all Redis connections.

But the heavy serious question is, it will add prefix named laravel_database_ before your channel name when you trigger an web socket event from laravel application, into laravel_database_private.channel.xxx.

---

Reference

• Can't recieve broadcasted message from laravel echo server tlaverdure/laravel-echo-server#407
• https://github.com/laravel/laravel/blob/da83285/config/database.php#L126

[laurencei]

this config/database.php redis prefix line, is a hardcode logic to set a un-customizable prefix for all redis connections.

You can change that prefix to be anything you want. You control that code.

I think the apparent bug is that, if a prefix is set, it is not appended to the channel name? Is that a bug in Laravel Framework, or a bug in Laravel Echo?

[xiaohuilam]

this config/database.php redis prefix line, is a hardcode logic to set a un-customizable prefix for all redis connections.

You can change that prefix to be anything you want. You control that code.

I think the apparent bug is that, if a prefix is set, it is not appended to the channel name? Is that a bug in Laravel Framework, or a bug in Laravel Echo?

Yep, laravel-echo client does not support to set a string prefix for channel name.

// the private method will add, and only add `private-` prefix,
//   which mismatch with laravel 5.8 redis driver provides `laravel_database_private-`.
echo.private(`chat.${room_id}`).listen()

I suggest to remove config/database.php's redis.options.prefix option, because in the mix multiple laravel redis structure, better to set different redis database name REDIS_DB / REDIS_CACHE_DB for every app

[driesvints]

This is the same issue as laravel/echo#232

I'd say this is a framework issue so we should try to see to strip the prefix before emiting back to echo.

[driesvints]

I was trying to debug this but I'm currently stuck with setting up laravel-echo-server. If anyone could help out so I can debug this issue further, that'd be nice: tlaverdure/laravel-echo-server#428

[driesvints]

Managed to get it to work. @xiaohuilam I managed to reproduce the issue.

[driesvints]

I spent quite some time debugging this. The event gets published to Redis here:

framework/src/Illuminate/Broadcasting/Broadcasters/RedisBroadcaster.php

Line 102 in 24cc178

$connection->publish($channel, $payload);

Until this point everything's okay. But the channel probably gets its prefix set as soon as its published on this line. I can't figure out where the event gets pulled out of Redis. I suspect somewhere in Socket.io but I can't find it. And thus I can't figure out a way to strip the prefix again.

If anyone is willing to put in work into this that'd be great.

[jbrooksuk]

[..] is a hard-code un-customizable prefix (not in .env at least), to set a for all Redis connections.

This is now customisable out of the box with the REDIS_PREFIX variable.

[xiaohuilam]

[..] is a hard-code un-customizable prefix (not in .env at least), to set a for all Redis connections.

This is now customisable out of the box with the REDIS_PREFIX variable.

Better to default empty in .env.example (Existing project won't override the .env by copy .env.example).

[gimtonic]

Dont work REDIS_PREFIX="" in .env for fix prefix

#database.php

'redis' => [

    'client' => env('REDIS_CLIENT', 'predis'),

    'options' => [
        'cluster' => env('REDIS_CLUSTER', 'predis'),
       // 'prefix' => Str::slug(env('APP_NAME', 'laravel'), '_').'_database_',
    ],

    'default' => [
        'host' => env('REDIS_HOST', '127.0.0.1'),
        'password' => env('REDIS_PASSWORD', null),
        'port' => env('REDIS_PORT', 6379),
        'database' => env('REDIS_DB', 0),
    ],

    'cache' => [
        'host' => env('REDIS_HOST', '127.0.0.1'),
        'password' => env('REDIS_PASSWORD', null),
        'port' => env('REDIS_PORT', 6379),
        'database' => env('REDIS_CACHE_DB', 1),
    ],

], 

Dont work private channels then comment 'prefix' or 'prefix' => "" or 'prefix => " "

[driesvints]

This is now fixed thanks to @tlaverdure in #30597