AWS API for Weather Data

1. Create an S3 Bucket

1. Navigate to the S3 Console.
2. Click Create bucket.
   • Name the bucket (e.g., myweathertests3).
   • Select a region (e.g., ap-southeast-2).
   • Enable versioning (optional, but recommended).
3. Click Create bucket.

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2. Create IAM Role for Lambda

1. Navigate to the IAM Console.
2. Click Roles > Create role.
   • Choose AWS service > Lambda.
   • Attach the following policies:
     • AWSLambdaBasicExecutionRole
     • A custom policy granting S3 permissions:

       {
         "Version": "2012-10-17",
         "Statement": [
           {
             "Effect": "Allow",
             "Action": [
               "s3:PutObject",
               "s3:GetObject",
               "s3:ListBucket"
             ],
             "Resource": [
               "arn:aws:s3:::my-weather-data-bucket",
               "arn:aws:s3:::my-weather-data-bucket/*"
             ]
           }
         ]
       }

3. Name the role (e.g., LambdaWeatherRole) and save.

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3. Create Lambda Functions

1. Navigate to the Lambda Console.
2. Click Create function > Author from scratch.
   • Name: getCurrentWeather
   • Runtime: Node.js 20.x
   • Role: Use the role created earlier (LambdaWeatherRole).
3. Upload the code:
   • Package the getCurrentWeather.js, getHistoricalWeather.js, and index.mjs into a ZIP file along with a package.json file.
   • Use the AWS Lambda editor to specify index.mjs as the handler.
   • Example handler: index.handler.

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4. Create API Gateway

1. Navigate to the API Gateway Console.
2. Click Create API > HTTP API.
3. Configure routes:
   • Route 1: GET /weather/{city}
     • Integration: Link to the getCurrentWeather Lambda function.
   • Route 2: GET /weather/history/{city}
     • Integration: Link to the getHistoricalWeather Lambda function.
4. Deploy the API and note the API endpoint.

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5. Configure Environment Variables

1. In the Lambda Console, for each function:
   • Go to the Configuration tab > Environment variables.
   • Add:
     • API_KEY: The OpenWeatherMap API key.
     • BUCKET_NAME: The name of the S3 bucket.

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Testing the API

Example for Current Weather

curl https://<api-id>.execute-api.<region>.amazonaws.com/weather/Melbourne

curl https://<api-id>.execute-api.<region>.amazonaws.com/weather/history/Melbourne