Check layer size during PR (#125)

* Add PR size checking script

* Use /bin/bash for build_layers script

* Bump miminum layer size

* Fix typo

Author: DarcyRaynerDD

.github/workflows/check-size.yml

@@ -0,0 +1,28 @@
+name: check-size
+
+on: pull_request
+
+jobs:
+  check-size:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+
+      - name: Install dependencies
+        run: |
+          pip install virtualenv
+          virtualenv venv
+          source venv/bin/activate
+          pip install .[dev]
+
+      - name: Build Layers
+        run: ./scripts/build_layers.sh
+
+      - name: Check Size
+        run: ./scripts/check_layer_size.sh

scripts/build_layers.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Unless explicitly stated otherwise all files in this repository are licensed
 # under the Apache License Version 2.0.

scripts/check_layer_size.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Unless explicitly stated otherwise all files in this repository are licensed
+# under the Apache License Version 2.0.
+# This product includes software developed at Datadog (https://www.datadoghq.com/).
+# Copyright 2019 Datadog, Inc.
+
+# Compares layer size to threshold, and fails if below that threshold
+
+# 5 mb size limit
+MAX_LAYER_COMPRESSED_SIZE_KB=$(expr 5 \* 1024) 
+MAX_LAYER_UNCOMPRESSED_SIZE_KB=$(expr 16 \* 1024) 
+
+
+LAYER_FILES_PREFIX="datadog_lambda_py"
+LAYER_DIR=".layers"
+VERSIONS=("2.7" "3.6" "3.7" "3.8")
+
+for version in "${VERSIONS[@]}"
+do
+    FILE=$LAYER_DIR/${LAYER_FILES_PREFIX}${version}.zip
+    FILE_SIZE=$(stat --printf="%s" $FILE)
+    FILE_SIZE_KB="$(( ${FILE_SIZE%% *} / 1024))"
+    echo "Layer file ${FILE} has zipped size ${FILE_SIZE_KB} kb"
+    if [ "$FILE_SIZE_KB" -gt "$MAX_LAYER_COMPRESSED_SIZE_KB" ]; then
+        echo "Zipped size exceeded limit $MAX_LAYER_COMPRESSED_SIZE_KB kb"
+        exit 1
+    fi
+    mkdir tmp
+    unzip -q $FILE -d tmp
+    UNZIPPED_FILE_SIZE=$(du -shb tmp/ | cut -f1)
+    UNZIPPED_FILE_SIZE_KB="$(( ${UNZIPPED_FILE_SIZE%% *} / 1024))"
+    rm -rf tmp
+    echo "Layer file ${FILE} has unzipped size ${UNZIPPED_FILE_SIZE_KB} kb"
+    if [ "$UNZIPPED_FILE_SIZE_KB" -gt "$MAX_LAYER_UNCOMPRESSED_SIZE_KB" ]; then
+        echo "Unzipped size exceeded limit $MAX_LAYER_UNCOMPRESSED_SIZE_KB kb"
+        exit 1
+    fi
+done