Can't create Lambda code hook for Lex's TestBotAlias with CloudFormation

Question

My team is building a Lex Bot backed by AWS Lambda as a fulfillment code hook. We're using CloudFormation to deploy the stack.

We're facing an issue where with each deployment introducing changes to the bot, the association between the Lambda and the TestBotAlias gets removed.

We've tried to build an `AWS::Lex::BotAlias`, but it doesn't work because CloudFormation tries to create a second alias with the same name. Moreover, references to the `DRAFT` version of the bot are not possible because `AWS::Lex::BotVersion` allows us only to use numerical values.

Is there a recommended way to associate the Lex bot with Lambda for tests so that it doesn't get removed every time we deploy a stack?

Answer

I was finally able to get this working (in AWS CDK)

While defining the lex bot:
```python
test_bot_alias_settings = (
    lex.CfnBot.TestBotAliasSettingsProperty(
        bot_alias_locale_settings=[
            lex.CfnBot.BotAliasLocaleSettingsItemProperty(
                locale_id="en_US",
                bot_alias_locale_setting=lex.CfnBot.BotAliasLocaleSettingsProperty(
                    enabled=True,
                    code_hook_specification=lex.CfnBot.CodeHookSpecificationProperty(
                        lambda_code_hook=lex.CfnBot.LambdaCodeHookProperty(
                            code_hook_interface_version="1.0",
                            lambda_arn=self.my_lex_lambda.function_arn,
                        )
                    ),
                ),
            )
        ],
    ),
)

```

Answer

Hello!

With the way that the CloudFormation workflow is set up, there is currently no mechanism of modifying the TestBotAlias within a CFN template. In the meantime a possible solution you can use is to create a new BotVersion when you are ready to test your bot and associate an AWS::Lex::BotAlias resource with templated bot version.

If there are any other questions please feel free to reach out again!

Can't create Lambda code hook for Lex's TestBotAlias with CloudFormation

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