ServiceNow Integration with AWS Lambda:
1. The first step is to create a Lambda function in AWS.
Navigate to Lamba>Create Function
2. In Function Code, you have options to code entry type as:
- Edit Code inline
- Upload a zip fie
- Upload a file from S3
I have selected Edit code inline for now for the simple demonstration
Then select the Runtime you want to run in and the handler information.
Handler should be of the definition lambda_function_file_name.method_name
So, for example, here, my python file name is lambda_function and method is lambda_handler.
3. Then, type the code and analysis you wish to perform. In the example, I am retrieving the input from API call and returning the output after concatenating the string ‘something’ to it.
def lambda_handler(event, context):
short_desc=event['params']['querystring']['token']; //accessing the parameters from api call
return 'something'+short_desc
4. Then, type the code and analysis you wish to perform. In the example, I am retrieving the input from API call and returning the output after concatenating the string ‘something’ to it.
5. Create an execution role with accessing permissions to Lambda and save the function.
6. Now, select the API Gateway as the trigger and by default, ANY method is available in the Method Execution.
7. Add the GET method or any other method you wish to call the Lambda function through your API calls.
8. Now for accessing the parameters from the API query/call, you need to set up the Integration Request for GET method as shown below:
Note: The Body Mapping Template has to be defined and saved which passes all the parameters to the integration endpoint and can be accessed in the Lambda functions using ‘event’ variable. There are different ways to accomplish this (like Lambda proxy integration) and this is one of the fast and easy ways.
9. Now, it is ready to invoke the url and trigger the respective Lambda function. The invoke url is found at Stages>GET method.
10. Lastly, click the API and Select Actions>Deploy API.
ServiceNow REST Message creation
1. Navigate to System Web Services>REST Message>New.
2. Fill in the form with a name and endpoint(url from aws lambda). If you want to send parameters, insert them in the endpoint like
https://eqtknizmg4.execute-api.us-east-1.amazonaws.com/start/myLambdaFunction?token=${token}
3. The GET method is added by default in the HTTP method and add the variables (in this case ‘token’) in the Variable Substitutions column and give a test value.
4. Finally, test the Rest Message by clicking the Test Related Link and the output is in the Response field.
Following these steps, you can successfully create ServiceNow integration with AWS Lambda.
If you've any difficulty in understanding, please let me know. Also, share your feedback after successful integration.
Thank you.
ServiceNow Integration with AWS Lambda:
1. The first step is to create a Lambda function in AWS.
Navigate to Lamba>Create Function
2. In Function Code, you have options to code entry type as:
- Edit Code inline
- Upload a zip fie
- Upload a file from S3
I have selected Edit code inline for now for the simple demonstration
Then select the Runtime you want to run in and the handler information.
Handler should be of the definition lambda_function_file_name.method_name
So, for example, here, my python file name is lambda_function and method is lambda_handler.
3. Then, type the code and analysis you wish to perform. In the example, I am retrieving the input from API call and returning the output after concatenating the string ‘something’ to it.
def lambda_handler(event, context):
short_desc=event['params']['querystring']['token']; //accessing the parameters from api call
return 'something'+short_desc
4. Then, type the code and analysis you wish to perform. In the example, I am retrieving the input from API call and returning the output after concatenating the string ‘something’ to it.
5. Create an execution role with accessing permissions to Lambda and save the function.
6. Now, select the API Gateway as the trigger and by default, ANY method is available in the Method Execution.
7. Add the GET method or any other method you wish to call the Lambda function through your API calls.
8. Now for accessing the parameters from the API query/call, you need to set up the Integration Request for GET method as shown below:
Note: The Body Mapping Template has to be defined and saved which passes all the parameters to the integration endpoint and can be accessed in the Lambda functions using ‘event’ variable. There are different ways to accomplish this (like Lambda proxy integration) and this is one of the fast and easy ways.
9. Now, it is ready to invoke the url and trigger the respective Lambda function. The invoke url is found at Stages>GET method.
10. Lastly, click the API and Select Actions>Deploy API.
ServiceNow REST Message creation
1. Navigate to System Web Services>REST Message>New.
2. Fill in the form with a name and endpoint(url from aws lambda). If you want to send parameters, insert them in the endpoint like
https://eqtknizmg4.execute-api.us-east-1.amazonaws.com/start/myLambdaFunction?token=${token}
3. The GET method is added by default in the HTTP method and add the variables (in this case ‘token’) in the Variable Substitutions column and give a test value.
4. Finally, test the Rest Message by clicking the Test Related Link and the output is in the Response field.
Following these steps, you can successfully create ServiceNow integration with AWS Lambda.
If you've any difficulty in understanding, please let me know. Also, share your feedback after successful integration.
Thank you.
