PSR SimpleCache connection error

[tricarte]

This is a sample code connecting to Redis using relay with its PSR16 cache implementation.

<?php

require_once __DIR__ . '/vendor/autoload.php';

use Relay\Relay;
use CacheWerk\Relay\Psr\SimpleCache\RelayCache;

$relay = new Relay;
$relay->connect('127.0.0.1', 6379);

echo $relay->get('some:key') . "\n"; // This line works

$cache = new RelayCache($relay);
echo $cache->get('some:key') . "\n"; // This gives 'not connected' error

This is the full error:

PHP Fatal error:  Uncaught Relay\Exception: Not connected (RELAY_ERR_IO; relay.c:3513) in /home/user/repos/relay-redis/vendor/cachewerk/relay/src/Psr/SimpleCache/RelayCache.php:43
Stack trace:
#0 /home/user/repos/relay-redis/vendor/cachewerk/relay/src/Psr/SimpleCache/RelayCache.php(43): Relay\Relay->get()
#1 /home/user/repos/relay-redis/index.php(14): CacheWerk\Relay\Psr\SimpleCache\RelayCache->get()
#2 {main}

Next CacheWerk\Relay\Psr\SimpleCache\CacheException: Not connected (RELAY_ERR_IO; relay.c:3513) in /home/user/repos/relay-redis/vendor/cachewerk/relay/src/Psr/SimpleCache/RelayCache.php:47
Stack trace:
#0 /home/user/repos/relay-redis/index.php(14): CacheWerk\Relay\Psr\SimpleCache\RelayCache->get()
#1 {main}
  thrown in /home/user/repos/relay-redis/vendor/cachewerk/relay/src/Psr/SimpleCache/RelayCache.php on line 47

So, How am I supposed to construct the RelayCache instance?

[tillkruss]

@michael-grunder Can you elaborate on RELAY_ERR_IO?

[tricarte]

Sorry but that's the entire error message. I don't know any way to further dig into.

I tried to integrate Relay extension into a web framework that uses symfony/cache and illuminate/redis and they all worked correctly there. Then I realized that Relay has its own PSR-16 implementation but it didn't work in that framework. Only then I tried this simple code but I couldn't run it with success.

So, as I understand, there is nothing wrong with the code?

[tillkruss]

@tricarte: I meant @michael-grunder can tell us exactly what Not connected (RELAY_ERR_IO) means to diagnose this.

[tricarte]

@tillkruss Oh, one of those thousand ways to feel like stupid. Sorry!

[tillkruss]

Hehe, no worries. We've fixed the issue: #131

[michael-grunder]

That error generally happens when we try to read data from Redis when not connected at all. For example this would cause it:

$relay = new \Relay\Relay;
$relay->get('foo');

So my guess is that the adapter isn't doing any sort of connection before trying to use it. I'll see if I can replicate the behavior locally.

[michael-grunder]

This is fixed in #131

[tricarte]

Thanks for the fix and explanation.