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# general

sparse-intern-71089

11/19/2021, 6:44 PM

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red-match-15116

11/19/2021, 6:45 PM

The diff is not the

PreviewResult

which is what you're getting from

stack.preview

You might want to do

diff = stack.preview(diff=True, on_output=print)

red-match-15116

11/19/2021, 6:46 PM

You can also get more diff information by using the

on_event

callback

stack.preview(on_event=print)

print is just an example here but you can get all of the diff information from the events generated by on_event

red-match-15116

11/19/2021, 6:47 PM

You probably want to look at the

ResourcePreEvent

specifically.

helpful-afternoon-10938

11/19/2021, 6:48 PM

perfecto, exactly what I was looking for🤘thanks

red-match-15116

11/19/2021, 6:50 PM

Here's an example of how to do things with the events: https://gist.github.com/komalali/8b90ab0726e49067989d5219c438e01b#file-main-py-L9-L22 Events are defined here: https://github.com/pulumi/pulumi/blob/master/sdk/python/lib/pulumi/automation/events.py#L422-L430

helpful-afternoon-10938

11/19/2021, 7:06 PM

ok got it but what will be the simplest way to get a json output of below data. cause when I'm fetching the stdout or on_output=print I get only string

Copy code

pulumi:pulumi:Stack: (same)
    [urn=urn:pulumi:test::BMasServiceEKS::pulumi:pulumi:Stack::BMasServiceEKS-test]
    ~ aws:ec2/securityGroup:SecurityGroup: (update)
        [id=sg-fhc56yrrhc6rh]
        [urn=urn:pulumi:test::BMasServiceEKS::aws:ec2/securityGroup:SecurityGroup::allowTls]
        [provider=urn:pulumi:test::BMasServiceEKS::pulumi:providers:aws::default_4_26_0::htrddhrt-hrthhrd-4e48-9ed2-dhrrtyrddrt]
      ~ ingress: [
          ~ [0]: {
                  ~ cidrBlocks: [
                      - [0]: "0.0.0.0/0"
                    ]
                  - fromPort  : 22
                  - protocol  : "tcp"
                  - toPort    : 22
                }
        ]

red-match-15116

11/19/2021, 7:14 PM

You would have to get the information from the events. Using

on_event

. Maybe something like:

stack.preview(on_event=json.dumps)

Or even:

Copy code

def print_resource_pre_as_json(evt: auto.EngineEvent):
    if evt.resource_pre_event:
        json.dumps(evt.resource_pre_event)

stack.preview(on_event=print_resource_pre_as_json)

red-match-15116

11/19/2021, 7:15 PM

There's no automatic way to do this so you'll need to experiment

helpful-afternoon-10938

11/21/2021, 4:01 PM

indeed had to create a dirty function to get only the diff resources from the string output.

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