SncRedisBundle (predis) - heroku : how to configure the DSN - php

Question

I'm using SncRedisBundle with success locally but can't have it work using heroku.
Here is my config :
#config.yml
imports:
- { resource: heroku/parameters_heroku.php } #heroku cloud provider configuration's
snc_redis:
clients:
default:
type: predis
alias: default
dsn: "%redis_url%"
cache:
type: predis
alias: cache
dsn: "%redis_url%&database=1"
logging: false
session:
type: predis
alias: session
dsn: "%redis_url%&database=2"
task:
type: predis
alias: task
dsn: "%redis_url%&database=3"
doctrine:
type: predis
alias: doctrine
dsn: "%redis_url%&database=4"
session:
client: session
ttl: 10800 #le session expirera apres 3 heures
doctrine:
metadata_cache:
client: doctrine
entity_manager: default # the name of your entity_manager connection
document_manager: default # the name of your document_manager connection
result_cache:
client: doctrine
entity_manager: [default] # you may specify multiple entity_managers
query_cache:
client: doctrine
entity_manager: default
second_level_cache:
client: doctrine
entity_manager: default
monolog:
client: cache
key: monolog
swiftmailer:
client: default
key: swiftmailer
#heroku/parameters_heroku.php
<?php
$is_heroku = getenv("IS_HEROKU");//manually added : heroku config:set IS_HEROKU=1
if (!$is_heroku) {
return;
}
if ($redisUrl = getenv('REDIS_URL')) {
$aParsedRedisUrl = parse_url($redisUrl);
$redisConstructedDsn = 'redis://'.$aParsedRedisUrl['host'].':'.$aParsedRedisUrl['port'].$aParsedRedisUrl['path'].'?'.'password='.$aParsedRedisUrl['pass'].($aParsedRedisUrl['query'] ? '&'.$aParsedRedisUrl['query'] : ''); // le user ne sert pas : .'&user='.$aParsedRedisUrl['user']
$container->setParameter('redis_url', $redisConstructedDsn);
}
if I dump $redisConstructedDsn during the heroku build process, I've got something like that : redis://xxxxxx.compute-1.amazonaws.com:18839?password=foobar, so, it seem pretty compatible with predis doc
but the composer construction fails with a
remote: [Predis\Response\ServerException] remote:
NOAUTH Authentication required.
I can't find what I did wrong

Answer 1

problem solved :
initially I used this kind of syntax : dsn: "%redis_url%/3" wich is incompatible with heroku.
When I changed it to an acceptable format : "%redis_url%?database=3", I added bug elsewhere, so here is the simple correction in heroku/parameters_heroku.php
if ($redisUrl = getenv('REDIS_URL')) {
$container->setParameter('redis_url', $redisUrl);
}
some resources on the internet will say that predis isn't compatible with heroku's format, but they are old&wrong ;)