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CloudWatchEvents.ScheduledEvent cannot be used with EventBridge Scheduler

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
aws, csharp
Domain
backend, cloud

Research direction

Start with Amazon.Lambda.CloudWatchEvents.ScheduledEvent and its Detail deserialization in version 4.4.0, then compare it with the supplied EventBridge Scheduler payload. Determine the supported string form for detail and verify that the Scheduler event converts successfully on .NET 8 without breaking normal event-object deserialization.

Written by the indexing model from the issue text.

Description

bug module/lambda-client-lib p2 service-api
Describe the bug

Attempting to use ScheduledEvent with EventBridge Scheduler fails due to JSON Serialization.

Regression Issue
  • Select this option if this issue appears to be a regression.
Expected Behavior

I am able to use ScheduledEvent with EventBridge Scheduler.

Current Behavior

Error converting the Lambda event JSON payload to type Amazon.Lambda.CloudWatchEvents.ScheduledEvents.ScheduledEvent: The JSON value could not be converted to Amazon.Lambda.CloudWatchEvents.ScheduledEvents.Detail. Path: $.detail | LineNumber: 0 | BytePositionInLine: 339.

Additional Information/Context

Here's the event I'm receiving:

{
    "version": "0",
    "id": "49672d39-8c3a-4cc6-8de5-c57b0acf718f",
    "detail-type": "Scheduled Event",
    "source": "aws.scheduler",
    "account": "12345",
    "time": "2024-11-07T22:05:00Z",
    "region": "eu-central-1",
    "resources": [
        "arn:aws:scheduler:eu-central-1:12345:schedule/default/test-schedule"
    ],
    "detail": "{}"
}

It is very-very similar to what we have in ScheduledEvent. However, "detail" here is a string, not a json object.

According to
https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-events-structure.html
"detail" should be a JSON object, but "{}". I have no idea why such string is allowed, or whether any other stringified JSON is possible there.

Possible Solution

Write JSON converter, which allows Detail to be string (either allow empty object string only "{}", or a full stringified JSON object - not sure).

AWS .NET SDK and/or Package version used

Amazon.Lambda.CloudWatchEvents 4.4.0

Targeted .NET Platform

.NET 8

Operating System and version

AmazonLinux

Dominant language
C#
Stars
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Forks
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Avg merge
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Merged PRs (30d)
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