Retrieve request data information's using JSR223 post processer in JMeter - jmeter

Question

I am using the following payload as post request to one of my test servers, and I want to retrieve the size of the payload, uniquid from the payload. I am using JSR223 post processer for this any help to get these information
Sample Payload:
POST https://test.eventgrid.azure.net/api/events
POST data:
[
{
"subject": "audit",
"id": "6aca5990-713b-47d1-be81-ed228bd81735",
"eventType": "test.audit",
"eventTime": "2020-08-31T05:02:02.462Z",
"data": {
"version": "1.0",
"application": {
"id": "PI0001",
"name": "PLMAS",
"component": {
"id": "PLMAS01",
"name": "SingleFileImporter",
"type": "LogicApp"
}
},
"audit": {
"id": "168999807c4c46af908ce7a455a5e5eb",
"timestamp": "2020-08-31T05:02:02.462Z",
"type": "input",
"entry": "File retrieved, validated and processed successfully",
"message": {
"headers": "J9SGinwTz0SSrEHrBrhMS3wquHlWu",
"payload": "00=SfsDZ0LESTLZ6VpCmIEDT5nqOPqlwUJknCSIQuAIBM8wKj",
"type": "csv",
"protocol": ""
},
"keys": [
{
"name": "file-archive-location",
"value": "Performance Test From Jmeter"
}
]
},
"context": {
"transactionId": "65174971-62d6-44da-9ecd-537b8d636464",
"messageId": "04cb206c-25dd-4385-bed7-42f770c67cb8",
"customerId": "FANSOI",
"studyId": "FANSOI1234"
}
},
"dataVersion": "1.0",
"metadataVersion": "1"
}
]
Is there any default method like sampler.getUrl() to get the request url and sampler.getArguments().getArgument(0).getValue() to get the request body.

Answer 1

This should do what you want:
import java.util.List;
def size = prev.getBodySizeAsLong() + prev.getHeadersSize();
List<String> list = com.jayway.jsonpath.JsonPath.read( prev.getQueryString(), "$..id");
String uniqueId = list.get(0).toString();
log.info("size:{}, uniqueId:{}", size, uniqueId);

Answer 2

You can use the same functions but instead of sampler go for ctx.getCurrentSampler(), something like:
def data = ctx.getCurrentSampler().getArguments().getArgument(0).getValue()
def size = data.length()
def id = new groovy.json.JsonSlurper().parseText(data)[0].id
log.info('Size: ' + size)
log.info('Id: ' + id)
Demo:
More information:
Apache Groovy - Parsing and producing JSON
Top 8 JMeter Java Classes You Should Be Using with Groovy