NiFi - Call Redis Commands in Groovy Script

Question

I am trying to connect to my Redis instance from a groovy script (ExecuteGroovyScript) and execute arbitrary commands such as LPUSH. I currently have RedisConnectionPoolService enabled and working fine for caching processors.

Is there any way to achieve this? Any examples are appreciated.

EDIT:

I got to the point where I can call a command but for some reason it fails, here is the code and error

service = context.getControllerServiceLookup().getControllerService("2b841623-35ed-1e1a-0a77-46087267939d")
service.getConnection().withCloseable { redis ->
   redis.listCommands().lPush("key".getBytes(), "1".getBytes())
}

mattyb · Accepted Answer · 2021-08-27 14:24:29Z

1

If you have a RedisConnectionPoolService called service and call service.getConnection(), you will have a Spring Redis RedisConnection instance, so you can check their API for the kinds of calls you can make.

For LPUSH specifically you can call service.getConnection().listCommands().lpush()

answered Aug 27, 2021 at 14:24

mattyb

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2 Comments

Cemre Mengü Over a year ago

Thanks! Could you please take look at my edit? I am able to call functions but they keep failing due to various type errors. Any ideas?

mattyb Over a year ago

There should be a stack trace in logs/nifi-app.log that should give you more information about the error

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