Heya I m trying to attach a Lambda to the Viewer Request eve Serverless Stack #help

Heya! I'm trying to attach a Lambda to the Viewer...

Tim V

03/01/2022, 5:21 PM

Heya! I'm trying to attach a Lambda to the Viewer Request event using StaticSite... I'm probably overlooking something silly. Here's the error...

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The Lambda function associated with the CloudFront distribution is invalid or doesn't have the required permissions.

Here's my setup...

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const viewerRequest = new Function(this, "viewer-request", {
      handler: "stack/cloudfront/viewer-request.handler",
      memorySize: 128,
      timeout: 5,
      // permissions: [
      //   new PolicyStatement({
      //     effect: Effect.ALLOW,
      //     actions: ["lambda:InvokeFunction"],
      //     resources: [viewerRequestHandler.functionArn],
      //   }),
      // ],
    });
    viewerRequest.node.host.environment = {};
    viewerRequest.node.host.role.assumeRolePolicy.statements = [
      new PolicyStatement({
        effect: Effect.ALLOW,
        actions: ["sts:AssumeRole"],
        principals: [
          new ServicePrincipal("<http://lambda.amazonaws.com|lambda.amazonaws.com>"),
          new ServicePrincipal("<http://edgelambda.amazonaws.com|edgelambda.amazonaws.com>"),
        ],
      })
    ];

    const site = new StaticSite(this, "website", {
      path: "stack/website",
      buildOutput: "dist",
      buildCommand: "yarn build",
      environment: { API_ENDPOINT: api.url },
      disablePlaceholder: true,
      cfDistribution: {
        priceClass: PriceClass.PRICE_CLASS_100,
        defaultBehavior: {
          allowedMethods: ["GET"],
          edgeLambdas: [{
            eventType: LambdaEdgeEventType.VIEWER_REQUEST,
            functionVersion: viewerRequest.currentVersion,
          }],
        },
        // additionalBehaviors: {
        //   "/files": {
        //     origin: new S3Origin(bucket.s3Bucket),
        //     allowedMethods: ["GET"],
        //     edgeLambdas: [{
        //       eventType: LambdaEdgeEventType.VIEWER_REQUEST,
        //       functionVersion: viewerRequest.currentVersion,
        //     }],
        //   },
        // },
      },
    });

Tim V

03/01/2022, 5:22 PM

Side question... should remote lambda work for lambda edge functions?

Tim V

03/01/2022, 6:42 PM

Oh, and here's the current Lambda that I'm trying to attach...

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export const handler = async event => {
    console.log(JSON.stringify(event, null, 2));
    return event;
};

Frank

03/02/2022, 1:26 AM

Hey @Tim V,

sst.Function

currently doesn’t support Edge functions.

Frank

03/02/2022, 1:27 AM

You’d need to use the

cloudfront.experimental.EdgeFunction

construct to create an Edge function.

Frank

03/02/2022, 1:27 AM

Here’s an example https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudfront.experimental.EdgeFunction.html#example

Frank

03/02/2022, 1:28 AM

^ there’s an open issue for supporting Lambda@Edge native in SST. I’ve bumped up the priority on it https://github.com/serverless-stack/serverless-stack/issues/577

Tim V

03/02/2022, 4:40 AM

Right on. I scoured Slack a while back and found a way to use SST.Functions as Lambda@Edge (that's the viewerRequest.node.host... assignments). I've been using that successfully for Lambda@Edge. I think that my problem today was that I had a bad response from my lambda. I'm getting back to confirming the issue. I should have cross-referenced by custom code before posting in help... but... that's no fun. 🙂

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