Don't work methods that use KEYS command(ioredis)

[witem]

Hi,
If I set in config keyPrefix. Some commands stop work(it described in ioredis docs: https://github.com/luin/ioredis/blob/master/README.md#transparent-key-prefixing)

Step to reproduce:

• create NodeResque.Queue with not null options keyPrefix
• create scheduled job
• call await queue.timestamps()

Methods that stop working(maybe not all):

• queue.timestamps()
• queue.locks()
• queue.stats()
• scheduler.checkStuckWorkers()

[evantahler]

Can you confirm that your keyPrefix does not have an special charecters?

As a note this might be conflicting with the node-resque "namespace" option:

• defined here https://github.com/taskrabbit/node-resque/blob/master/lib/connection.js#L85-L91
• namespace defined here: https://github.com/taskrabbit/node-resque/blob/master/lib/connection.js#L12

[witem]

Yes, it doesn't have any special charecters. And it not conflicting with namespace option.

I use keyPrefix: undefinedshmell

[usebaz]

@evantahler ping =)

[evantahler]

In d3477e4 I've added a number of passing tests which demonstrate that (I think) the ioredis+prefix behavior is working properly.

Please fork this project, and add a failing test to this section which demonstrates the problem you are observing.

[witem]

Hi @evantahler
I add failed tests for queue.timestamps: witem@cad30e1

But I think also broken next methods:

• queue.locks()
• queue.stats()
• scheduler.checkStuckWorkers()

[witem]

Hi @evantahler
It's normal test case?

[evantahler]

Thank you for your examples! That helped me to see that the issue was coming from any command which relies on redis.keys(), as other methods work OK with the keyPrefix.

It seems that supporting a keyPrefix with redis.keys() is explicitly not support by ioredis. It is mentioned in their readme, and in a number of issues:

• using the results of "KEYS" when a keyPrefix option is being used redis/ioredis#381
• keyPrefix in 'redis.keys' command redis/ioredis#254
• keyPrefix vs prefix redis/ioredis#359
• Key prefixing with blpop returns prefixed key redis/ioredis#325

The most clear response from @luin is

The first argument of KEYS command is a pattern rather than key name, so we don't prefix it with keyPrefix.

and I agree with him. I think that using keyPrefix in this way is dangerous at the command level. That is why we use redis "namespaces" instead in a way we have direct control over, which allows a similar result.

I would recommend either using databases within your redis server to arrange your data, rather thankeyPrefix going forward.

I will add a note to our readme that we do not support keyPrefix with ioredis (#256)

[witem]

@evantahler maybe I can make PR, for allow make connection options namespace an array.

Example:

const connectionDetails = {
  namespace: ['prefix', 'resque'],
}
const connection = new NodeResque.Connection(connectionDetails)

And in method connection.key change unshift(https://github.com/taskrabbit/node-resque/blob/52c11a7932980ebfdcdfd2519d3b508f423680c6/lib/connection.js#L89) to:

if (Array.isArray(this.options.namespace)) {
  args.unshift(...this.options.namespace)
} else {
  args.unshift(this.options.namespace)
}

It's allow to use namespace more flexibly.

[evantahler]

If you make your change non-breaking, ie: it works with both arrays and strings, that could work. Please be sure to test it!