From 9875ae97a8430ac2e846f5989761b46a2af6894f Mon Sep 17 00:00:00 2001
From: Brandon Liu <bdon@bdon.org>
Date: Tue, 17 May 2022 15:29:38 +0800
Subject: [PATCH] add lambda info

---
 lambda/.gitignore         |  1 +
 lambda/README.md          | 10 ++++++++++
 lambda/lambda_function.py | 20 ++++++++++++++++++++
 lambda/requirements.txt   |  2 ++
 4 files changed, 33 insertions(+)
 create mode 100644 lambda/.gitignore
 create mode 100644 lambda/README.md
 create mode 100644 lambda/lambda_function.py
 create mode 100644 lambda/requirements.txt

diff --git a/lambda/.gitignore b/lambda/.gitignore
new file mode 100644
index 00000000..c4c4ffc6
--- /dev/null
+++ b/lambda/.gitignore
@@ -0,0 +1 @@
+*.zip
diff --git a/lambda/README.md b/lambda/README.md
new file mode 100644
index 00000000..270905c9
--- /dev/null
+++ b/lambda/README.md
@@ -0,0 +1,10 @@
+# Build the tippecanoe layer (binary)
+
+1. On an AWS Linux 2 instance or image:
+
+    sudo yum update
+    sudo yum install git clang sqlite-devel zlib-devel
+
+2. Create a ZIP archive with the `tippecanoe` binary at `bin/tippecanoe` and upload as a Lambda layer
+3. Copy [lambda_function.py](lambda_function.py) (python 3.9 runtime)
+4. set the environment variable `OUTPUT_BUCKET` to your output bucket; give lambda IAM role access to input/output buckets
\ No newline at end of file
diff --git a/lambda/lambda_function.py b/lambda/lambda_function.py
new file mode 100644
index 00000000..a58a09db
--- /dev/null
+++ b/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!')
+    }
diff --git a/lambda/requirements.txt b/lambda/requirements.txt
new file mode 100644
index 00000000..844db8a4
--- /dev/null
+++ b/lambda/requirements.txt
@@ -0,0 +1,2 @@
+boto3==1.20.32
+botocore==1.23.32