add lambda info

lambda/lambda_function.py

@@ -0,0 +1,20 @@
+import os
+import json
+import subprocess
+import boto3
+# if the input bucket is publicly readable
+# from botocore import UNSIGNED
+# from botocore.config import Config
+
+def lambda_handler(event, context):
+    bucket = event['Records'][0]['s3']['bucket']['name']
+    key = event['Records'][0]['s3']['object']['key']
+    #s3 = boto3.client('s3',config=Config(signature_version=UNSIGNED))
+    s3 = boto3.client('s3')
+    s3.download_file(bucket,key,'/tmp/input.geojsonseq')
+    p = subprocess.check_call(['tippecanoe','-o','/tmp/output.mbtiles','/tmp/input.geojsonseq','--force'])
+    s3.upload_file('/tmp/output.mbtiles',os.environ['OUTPUT_BUCKET'],key + ".mbtiles")
+    return {
+        'statusCode': 200,
+        'body': json.dumps('Done!')
+    }