[MINIFICPP-1697] Give a better error message on unsupported algorithms in HashContent

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Labels: MiNiFi-CPP-Hygiene
• Assignee: Martin Zink
• Reporter: Ferenc Gerlits
• Created: 07/Dec/21 10:58
• Updated: 31/Mar/23 09:58
• Resolved: 09/Jan/23 10:12

Description

If you specify an unsupported hash algorithm in the Hash Algorithm property of the HashContent processor, it will fail with an error like this in onTrigger:

[2021-12-07 10:48:56.508] [org::apache::nifi::minifi::core::Processor] [warning] Caught "map::at" (St12out_of_range) during Processor::onTrigger of processor: 345ddcb9-a73b-4d4e-8c3d-66ed162d60fc (HashContent)
[2021-12-07 10:48:56.508] [org::apache::nifi::minifi::core::ProcessSession] [info] Penalizing c1565920-5742-11ec-bc73-5c879c2c3c60 for 30000ms at HashContent
[2021-12-07 10:48:56.508] [org::apache::nifi::minifi::core::ProcessSession] [warning] ProcessSession rollback for HashContent executed

It would be better to check the value in onSchedule, and if it is not supported, then log a better error message like "algorithm X is not supported; supported algorithms are: ..." and throw an exception, ie. fail to schedule the processor.