How to enable provisioned concurrency?

[cayter]

Does anyone here know how to extend the Cloudformation template to support provisioned concurrency? What I have tried was

1. Extended all the HttpLambda Properties with the below:

      AutoPublishAlias: live
      DeploymentPreference:
        Type: AllAtOnce
      ProvisionedConcurrencyConfig:
        ProvisionedConcurrentExecutions: 1

2. Updated the HttpApi resource to have StageName: live.

However, the changes above just wouldn't integrate the API gateway's live stage correctly to the HttpLambda live version and show { "message": "not found" }. Is there any example we can refer to for enabling provisioned concurrency? Thanks.

Note: I was following the approach recommended here.

[cayter]

Ended up with a solution that works but feel like quite ugly.

app.arc

...

@plugins
arc-plugin-http-provisioned-concurrency

...

src/plugins/arc-plugin-http-provisioned-concurrency.js

const HTTP_LAMBDA_SUFFIX = "HTTPLambda";
const PROVISIONED_CONCURRENCY = 3;
const SLS_API = "AWS::Serverless::HttpApi";
const SLS_FUNC = "AWS::Serverless::Function";
const SLS_STAGE_NAME = "live";

module.exports = {
  deploy: {
    start: async ({ arc, cloudformation, dryRun, inventory, stage }) => {
      Object.keys(cloudformation.Resources).map((key) => {
        const res = cloudformation.Resources[key];

        switch (res.Type) {
          case SLS_API: {
            Object.keys(res.Properties.DefinitionBody.paths).map((path) => {
              Object.keys(res.Properties.DefinitionBody.paths[path]).map((method) => {
                const fnSub =
                  res.Properties.DefinitionBody.paths[path][method][
                    "x-amazon-apigateway-integration"
                  ]["uri"]["Fn::Sub"];

                if (typeof fnSub === "string") {
                  res.Properties.DefinitionBody.paths[path][method][
                    "x-amazon-apigateway-integration"
                  ]["uri"]["Fn::Sub"] = res.Properties.DefinitionBody.paths[path][method][
                    "x-amazon-apigateway-integration"
                  ]["uri"]["Fn::Sub"].replace(
                    "HTTPLambda.Arn}/invocations",
                    `HTTPLambda.Arn}:${SLS_STAGE_NAME}/invocations`
                  );
                }
              });
            });

            break;
          }

          case SLS_FUNC:
            // Configure the provisioned concurrency if the Lambda handler is a HTTP handler.
            if (key.endsWith(HTTP_LAMBDA_SUFFIX)) {
              res.Properties.AutoPublishAlias = SLS_STAGE_NAME;
              res.Properties.DeploymentPreference = {
                Type: "AllAtOnce",
              };
              res.Properties.ProvisionedConcurrencyConfig = {
                ProvisionedConcurrentExecutions: PROVISIONED_CONCURRENCY,
              };
            }

            break;
        }
      });

      return cloudformation;
    },
  },
};

[tbeseda]

Right on. Glad you found a solution for now. I'm not a big fan of my Arc plugins that do work on CloudFormation, but that's mostly because the data shape is verbose. and then my linter does all kinds of fun things to get lines to fit width.

[ryanblock]

Nice! Please do PR this plugin at https://github.com/architect/plugins

[cayter]

Will find some time after June to create the plugin 'cause I'm now rushing our MVP for YC's demo day in August which we need to get customers to start using in June. Thanks for checking though.