Locator - AWS Lambda

About

This is a microservice for caching the users foursquare location (to DynamoDB), as well as returning it online.

The service currently requires an active foursquare token.

URL

https://k44y2euhaf.execute-api.us-east-1.amazonaws.com/prod/GeoBeacon

Type

This is a HTTP web service that returns JSON responses.

TODO

• Actually modularize some of this so we can do tests :P
• Auto-deployment to AWS Lambda upon passing of tests

AWS IAM permissions

• Requires DynamoDB access to the microservice

AWS IAM Policy

Here is the policy you need to assign in the IAM service

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "arn:aws:logs:*:*:*"
        },
        {
            "Action": [
                "dynamodb:DeleteItem",
                "dynamodb:GetItem",
                "dynamodb:PutItem",
                "dynamodb:Query",
                "dynamodb:Scan",
                "dynamodb:UpdateItem"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

Setup API Gateway information

• Set up API action
• Set up API method
• Go to integration request and under "Body Mapping Templates" enter in

{
    "oauth": "$input.params('oauth')",
    "action": "$input.params('action')",
    "version": "$stageVariables.get('version')",
    "identifier": "$input.params('identifier')",
    "tablename": "$stageVariables.get('tablename')",
    "refreshtime": "$stageVariables.get('refreshtime')"
}

This should map oauth to an input parameter so that you can receive this from an event.

The deployed URL

• https://k44y2euhaf.execute-api.us-east-1.amazonaws.com/prod/GeoBeacon

Deploying

How to create

Replace the function name, role and profile name with your profile

rm ../locatorV2.zip
zip -r ../locatorV2.zip *
aws lambda create-function --function-name GeoBeacon \
--runtime nodejs \
--handler index.handler \
--description "Where am I, and when" \
--role arn:aws:iam::859150883574:role/lambda_s3_exec_role \
--zip-file fileb://../locatorV2.zip \
--profile=perceptionz

How to update

Replace the function name and profile name with your profile

rm ../locatorV2.zip ; zip -r ../locatorV2.zip * ; aws lambda update-function-code --function-name GeoBeacon   --zip-file fileb://../locatorV2.zip --profile=perceptionz ; rm ../locatorV2.zip