AWS SNS Multiple notifications received - ios

Question

I have an API Gateway method calling a Lambda Node.js function. The Lambda function calls SNS and posts an APNS notification to my iPhone. When I invoke the API gateway or the Lambda function in the AWS console, I get one notification as expected. I also get one notification when running the Lambda code on the command line (Grunt and Node.js). I also get one notification when running the javascript from eclipse.
However, when I POST to the API gateway, I get 2-5 notifications. Every thing looks the same. I checked the Cloudwatch logs and it seems only one request is sent each time. Anybody have any idea how to debug this?

Answer 1

I've had similar. For me, it was that I wasn't calling the success callback properly.

Answer 2

I figured it out. I had my function outside the exports.handler function:
var AWS = require('aws-sdk');
var sns = new AWS.SNS();
var myAlerter = function(){
var numSent = 0;
var callback;
var arn = "arn:aws:sns:us-west-2:45435475457:endpoint/APNS/MyAlerter/5a11c61f-1122-3344-5566-656845463";
var sendNotification = function(messageText){
var apns = {
aps : {
alert : messageText,
sound : 'default'
}
};
var message = {
"APNS" : JSON.stringify(apns)
};
message = JSON.stringify(message);
var params = {
Message: message,
MessageStructure: 'json',
TargetArn: arn
};
numSent++;
sns.publish(params, function(err, data){
if (err){
callback(err, err.stack);
}else {
var result = {
error: false,
numSent : numSent,
data: data
};
callback(false,result);
}
});
};
return {
alert : function(message, cb){
callback = cb;
sendNotification(message);
}
}
}();
exports.handler = function(event, context){
var alertedCallback = function(error, data){
if (error){
context.done(error);
} else {
context.succeed(data);
}
};
myAlerter.alert(event.message, alertedCallback);
};
Everytime I called the API Gateway and invoked my Lambda function, the numSent variable would increment. I guess putting my function inside the exports.handler ensured that my function wasn't global or something.