Xbase++

Call an AWS Lambda Function

See more AWS Misc Examples

Demonstrates how to call an AWS Lambda function. Xbase++

LOCAL nSuccess
LOCAL oRest
LOCAL nBTls
LOCAL nPort
LOCAL nBAutoReconnect
LOCAL oAuthAws
LOCAL oJson
LOCAL oSbRequestBody
LOCAL oSbResponseBody
LOCAL nStatusCode

nSuccess := 0

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

oRest := CreateObject("Chilkat.Rest")

//  Connect to the Amazon AWS REST server.
//  such as https://email.us-west-2.amazonaws.com/
nBTls := 1
nPort := 443
nBAutoReconnect := 1

//  -------------------------------------------------------------------------------------------
//  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:
nSuccess := oRest:Connect("itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws", nPort, nBTls, nBAutoReconnect)

//  Provide AWS credentials for the REST call.
oAuthAws := CreateObject("Chilkat.AuthAws")
oAuthAws:AccessKey := "AWS_ACCESS_KEY"
oAuthAws:SecretKey := "AWS_SECRET_KEY"
//  the region should match our domain above..
oAuthAws:Region := "us-west-2"
oAuthAws:ServiceName := "lambda"

oRest:SetAuthAws(oAuthAws)

oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("name", "Benny")

oRest:AddHeader("Content-Type", "application/json")

oSbRequestBody := CreateObject("Chilkat.StringBuilder")
oJson:EmitSb(oSbRequestBody)

oSbResponseBody := CreateObject("Chilkat.StringBuilder")
nSuccess := oRest:FullRequestSb("POST", "/", oSbRequestBody, oSbResponseBody)
IF (nSuccess == 0)
    ? oRest:LastErrorText
    oRest:destroy()
    oAuthAws:destroy()
    oJson:destroy()
    oSbRequestBody:destroy()
    oSbResponseBody:destroy()
    RETURN
ENDIF

nStatusCode := oRest:ResponseStatusCode
IF (nStatusCode >= 400)
    ? "Response Status Code: " + Str(nStatusCode)
    ? "Response Body: " + oSbResponseBody:GetAsString()
    ? "Failed."
    oRest:destroy()
    oAuthAws:destroy()
    oJson:destroy()
    oSbRequestBody:destroy()
    oSbResponseBody:destroy()
    RETURN
ENDIF

? "Response Body:"
? oSbResponseBody:GetAsString()

oRest:destroy()
oAuthAws:destroy()
oJson:destroy()
oSbRequestBody:destroy()
oSbResponseBody:destroy()

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
        })
    };
};