B4X

Call an AWS Lambda Function

See more AWS Misc Examples

Demonstrates how to call an AWS Lambda function. B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim rest As ChilkatRest
rest.Initialize("rest")

'  Connect to the Amazon AWS REST server.
'  such as https://email.us-west-2.amazonaws.com/
Dim bTls As Boolean = True
Dim port As Int = 443
Dim bAutoReconnect As Boolean = True

'  -------------------------------------------------------------------------------------------
'  Note: The source of the lambda function (hosted on AWS) is shown at the bottom of this page.
'  --------------------------------------------------------------------------------------------

'  If your lambda function URL is: https://itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws/
'  then use just the domain part here:
success = rest.Connect("itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws", port, bTls, bAutoReconnect)

'  Provide AWS credentials for the REST call.
Dim authAws As ChilkatAuthAws
authAws.Initialize
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
'  the region should match our domain above..
authAws.Region = "us-west-2"
authAws.ServiceName = "lambda"

rest.SetAuthAws(authAws)

Dim json As ChilkatJsonObject
json.Initialize
json.UpdateString("name", "Benny")

rest.AddHeader("Content-Type", "application/json")

Dim sbRequestBody As ChilkatStringBuilder
sbRequestBody.Initialize
json.EmitSb(sbRequestBody)

Dim sbResponseBody As ChilkatStringBuilder
sbResponseBody.Initialize
success = rest.FullRequestSb("POST", "/", sbRequestBody, sbResponseBody)
If success = False Then
    Log(rest.LastErrorText)
    Return
End If


Dim statusCode As Int = rest.ResponseStatusCode
If statusCode >= 400 Then
    Log("Response Status Code: " & statusCode)
    Log("Response Body: " & sbResponseBody.GetAsString)
    Log("Failed.")
    Return
End If


Log("Response Body:")
Log(sbResponseBody.GetAsString)

JavaScript

export const handler = async (event) => {

    let body = "Hello World";

    if (event.body) {
        const input = JSON.parse(event.body);
        if (input.name) {
            body = "Hello " + input.name;
        }
    }

    return {
        statusCode: 200,
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            message: body
        })
    };
};