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SES: fix infinite loop with SNS event destination #12972

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SES: fix infinite loop with SNS event destination #12972

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@bentsku bentsku commented Aug 7, 2025

Motivation

While testing an SES/SNS sample, we encountered an issue where sending an email with SES with an SNS event destination configured that would have another SES subscriber, it would trigger an infinite loop.

There were 2 problems:

The following steps required for setting up event publishing are covered in the topics below:

  • You must create a configuration set using the Amazon SES console or API.
  • Add one or more event destinations (CloudWatch, Firehose, Pinpoint, or SNS) to the configuration set, and configure parameters unique to the event destination.
  • When you send an email, you specify which configuration set to use that contains your event destination.

There is still one somewhat big issue because Moto only accepts one EventDestination per configuration set, even if AWS accepts multiple, Moto will overwrite it every time you call CreateConfigurationSetEventDestination, but this is out of scope.

Changes

  • refactor a bit the SNS sending to centralize in one point and not have to modify the code 3 times, and for it to be easy to extend. We will probably need to refactor it again if we want to extend the SNSEmitter and add new kind of destinations
  • add a new LocalStack only test because we cannot really look into received emails when validating against AWS
  • write some TODOs about behavior problem of Event Destinations

@bentsku bentsku added this to the 4.8 milestone Aug 7, 2025
@bentsku bentsku self-assigned this Aug 7, 2025
@bentsku bentsku added aws:ses Amazon Simple Email Service semver: patch Non-breaking changes which can be included in patch releases labels Aug 7, 2025
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LocalStack Community integration with Pro

  2 files  ±    0    2 suites  ±0   2m 44s ⏱️ - 1h 39m 57s
166 tests  - 4 459  161 ✅  - 4 025  5 💤  - 434  0 ❌ ±0 
168 runs   - 4 459  161 ✅  - 4 025  7 💤  - 434  0 ❌ ±0 

Results for commit dbdc8b6. ± Comparison against base commit cd7b481.

This pull request removes 4460 and adds 1 tests. Note that renamed tests count towards both. 
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

tests.aws.services.ses.test_ses.TestSES ‑ test_ses_sns_topic_integration_send_email_ses_destination

♻️ This comment has been updated with latest results.

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Test Results - Preflight, Unit

22 063 tests  ±0   20 329 ✅ ±0   6m 22s ⏱️ -1s
     1 suites ±0    1 734 💤 ±0 
     1 files   ±0        0 ❌ ±0 

Results for commit dbdc8b6. ± Comparison against base commit cd7b481.

♻️ This comment has been updated with latest results.

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Test Results (amd64) - Acceptance

7 tests  ±0   5 ✅ ±0   3m 6s ⏱️ -1s
1 suites ±0   2 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit dbdc8b6. ± Comparison against base commit cd7b481.

♻️ This comment has been updated with latest results.

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Test Results (amd64) - Integration, Bootstrap

  5 files    5 suites   11m 56s ⏱️
190 tests 185 ✅  5 💤 0 ❌
196 runs  185 ✅ 11 💤 0 ❌

Results for commit 145adce.

@bentsku bentsku marked this pull request as ready for review August 7, 2025 22:21
@bentsku bentsku requested a review from viren-nadkarni as a code owner August 7, 2025 22:21
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viren-nadkarni requested changes Aug 11, 2025
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Just one request. Other affected tests also need updating but it's out of scope.

tests/aws/services/ses/test_ses.py Outdated
sender_email_address, recipient_email_address = setup_email_addresses()
config_set_name = f"config-set-{short_uid()}"

EMAILS.clear()
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I would ask to use the REST endpoint for SES email introspection because tests are not guaranteed to run in the same process as LocalStack.

  • GET /_aws/ses
  • DELETE /_aws/ses

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Sure, makes sense 👍 will update

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@viren-nadkarni viren-nadkarni Aug 11, 2025 •
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Pinging @giograno: Are there test fixtures for the LocalStack SDK?

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Yeah that actually would be super great to use 👍 I think we can do a second pass to update all usage of EMAILS and use the SDK instead 👀

@bentsku bentsku force-pushed the fix-ses-sns-infinite-loop branch from 145adce to dbdc8b6 Compare August 11, 2025 12:26
@bentsku bentsku requested a review from viren-nadkarni August 11, 2025 12:27
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@viren-nadkarni viren-nadkarni Awaiting requested review from viren-nadkarni viren-nadkarni is a code owner

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