how do I test Lambda functions using `yarn start` if they re Serverless Stack #help

how do I test Lambda functions using `yarn start` ...

Sam Hulick

08/12/2021, 6:23 AM

how do I test Lambda functions using

yarn start

if they’re not part of an API? 🤔 say I have 5 functions that are part of a step function, and I want to just test one of those in isolation. in Serverless Framework, I could just use

sls invoke local -f

to do this.

Kujtim Hoxha

08/12/2021, 6:51 AM

You could use the aws console and just send a test payload

Sam Hulick

08/12/2021, 7:22 AM

I could, but the idea here would be to test quickly without having to deploy

Kujtim Hoxha

08/12/2021, 7:23 AM

Ah got it, that definitely would be helpful

Frank

08/12/2021, 7:48 AM

Hey @Sam Hulick, your Lambda functions are deployed on

yarn start

, with stub code that sends requests to ur local.

Frank

08/12/2021, 7:48 AM

So you can still use the Lambda console to invoke them.

Sam Hulick

08/12/2021, 3:03 PM

Ah! So for example, in the AWS console I'd see something like "myfunc" and "myfunc-debug"?

Sam Hulick

08/12/2021, 7:51 PM

@Frank ok, so this is what I find confusing. I just spun up a new stack with a single Lambda, not linked to any API at all. and I did

yarn deploy

and then

yarn start

. there’s no API endpoint so I can’t invoke the function locally. so there doesn’t seem to be feature parity with Serverless Framework’s

sls invoke local -f

. so in the docs here (https://docs.serverless-stack.com/migrating-from-serverless-framework#invoking-locally) , it might be more accurate to say that the equivalent to

sls invoke local

is to go into the AWS Console, go to the function, and test there

Sam Hulick

08/12/2021, 7:51 PM

(or use the AWS CLI of course)

Sam Hulick

08/12/2021, 7:52 PM

it’s cool that I get console.logs in my local shell

Sam Hulick

08/12/2021, 7:56 PM

related: in

sst start

mode, if my Lambda function executes

/bin/whatever

, is it going to do that locally or in the cloud?

Frank

08/12/2021, 8:02 PM

in the AWS console I’d see something like “myfunc” and “myfunc-debug”?

You will just see “myfunc”. In

sst start

mode, the same Lambda functions are deployed, just the code has been swapped with the stub code. So the same function name in the console.

the equivalent to
sls invoke local
is to go into the AWS Console

We are working on a UI console where you can invoke ur functions directly. For now, bare with the console 😉

if my Lambda function executes
/bin/whatever
, is it going to do that locally or in the cloud?

If you mean the function does a

spawn

to run a script, yes that will be run locally.

Sam Hulick

08/12/2021, 8:11 PM

all makes sense - thanks!

Sam Hulick

08/12/2021, 8:14 PM

the live dev feature still blows my mind 😄 love how fast that feedback loop is

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