@omair, This may not be your exact use case, but here is a high-level view of how I do something similar to this:
- On an error view, add the custom message mapper and notification snap just prior to the exit snap.
- Then join the non-error output view to the exit output view with a union+sort to ensure processing doesnโt continue before the exit has time to process (you can eliminate this piece if you donโt care if valid records are processed before an error exit is triggered).
- If the exit isnโt triggered, then the pipeline will continue.
(Edit) - The above works with email notifications - which is what I first read into your question - possibly incorrectly. However, if youโre looking for API type output to the user, this example will not work.
hey omair,
Have you tried the Exit snap? It allows you to set an error message that can be returned to the user.
If you call that via a triggered task, then youโll get this kind of response.
[
{
"failure" : "Pipeline execution failed while waiting for output",
"reason" : "Snap errors: {ruuid=52e99318640a9a03d8681d0d_9b3dd03a-dde2-43e8-a0ba-fd58239c2a5d, reason=Number of input documents received is more than 0, label=Exit, resolution=Try passing less than or equal to 0 input documents, failure=Beep Boop! Failure!}",
"resolution" : "Fix the reported errors"
}
]
Youโd still have to extract it from the reason String, so not the most user friendly way.
You could also do something like this:
Where the mapper returns the output before the exit snap is invoked using a sleep in a Script snap. This will return a response like
[
{
"error": "Beep Boop! Failure!"
}
]
Which is easier to deal with.
This isnโt the most elegant approach since there is a race condition between when the mapperโs output is written out and when the exit snap processes the document from its input stream.
