In Node, it looks something like this

import {LambdaClient, InvokeCommand} from "@aws-sdk/client-lambda"; const lambda = new LambdaClient({region: process.env.region}); await lambda.send( new InvokeCommand({ FunctionName: "LAMBDA_FUNCTION_NAME_HERE" InvocationType: "Event", Payload: Buffer.from(JSON.stringify({body: message})) })

That's using aws-sdk v3, but the same strategy applies to aws sdk v2

Seems to work fine I just have a permission issue on the Invocation

"is not authorized to perform: lambda:InvokeFunction on resource"

We're you able to figure that out?

ERROR AccessDeniedException: User: {dev-my-sst-app-my-stack-ApiLambda} is not authorized to perform: lambda:InvokeFunction on resource: {arnawslambdaus eastfunction}

I can't seem to figure out the right permissions profile to get this to work. Am I supposed to give the API stack full permissions or the function that's being invoked?

Which looks like const myLambda = new sst.Function(...) const otherLambda = new sst.Function(...) myLambda.attachPermissions([new iam.PolicyStatement({ actions: ["lambda:InvokeFunction"], effect: iam.Effect.ALLOW, resources: [otherLambda.functionArn] })]);

but you could add it the the API route as well

api.attachPermissionsToRoute("GET /YOUR_ROUTE", [new iam.PolicyStatement({         actions: ["lambda:InvokeFunction"],         effect: iam.Effect.ALLOW,         resources: [otherLambda.functionArn]       })]);

there's probably a better shorthand to add the Invoke permission, but that's what I know off the top of my head 🙂

I like that second method very cool!