feat: Build dist ZIP for AWS Lambda layers

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
 
       - run: |
           pip install virtualenv
-          make dist
+          make aws-lambda-layer-build
 
       - uses: actions/upload-artifact@v2
         with:

Makefile

@@ -9,6 +9,7 @@ help:
 	@echo "make test: Run basic tests (not testing most integrations)"
 	@echo "make test-all: Run ALL tests (slow, closest to CI)"
 	@echo "make format: Run code formatters (destructive)"
+	@echo "make aws-lambda-layer-build: Build serverless ZIP dist package"
 	@echo
 	@echo "Also make sure to read ./CONTRIBUTING.md"
 	@false
@@ -58,3 +59,7 @@ apidocs-hotfix: apidocs
 	@$(VENV_PATH)/bin/pip install ghp-import
 	@$(VENV_PATH)/bin/ghp-import -pf docs/_build
 .PHONY: apidocs-hotfix
+
+aws-lambda-layer-build: dist
+	$(VENV_PATH)/bin/python -m scripts.build-awslambda-layer
+.PHONY: aws-lambda-layer-build

scripts/build-awslambda-layer.py

@@ -0,0 +1,71 @@
+import os
+import subprocess
+import tempfile
+import shutil
+from sentry_sdk.consts import VERSION as SDK_VERSION
+
+
+DIST_DIRNAME = "dist"
+DIST_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", DIST_DIRNAME))
+DEST_ZIP_FILENAME = f"sentry-python-serverless-{SDK_VERSION}.zip"
+WHEELS_FILEPATH = os.path.join(
+    DIST_DIRNAME, f"sentry_sdk-{SDK_VERSION}-py2.py3-none-any.whl"
+)
+
+# Top directory in the ZIP file. Placing the Sentry package in `/python` avoids
+# creating a directory for a specific version. For more information, see
+# https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html#configuration-layers-path
+PACKAGE_PARENT_DIRECTORY = "python"
+
+
+class PackageBuilder:
+    def __init__(self, base_dir) -> None:
+        self.base_dir = base_dir
+        self.packages_dir = self.get_relative_path_of(PACKAGE_PARENT_DIRECTORY)
+
+    def make_directories(self):
+        os.makedirs(self.packages_dir)
+
+    def install_python_binaries(self):
+        subprocess.run(
+            [
+                "pip",
+                "install",
+                "--no-cache-dir",  # Disables the cache -> always accesses PyPI
+                "-q",  # Quiet
+                WHEELS_FILEPATH,  # Copied to the target directory before installation
+                "-t",  # Target directory flag
+                self.packages_dir,
+            ],
+            check=True,
+        )
+
+    def zip(self, filename):
+        subprocess.run(
+            [
+                "zip",
+                "-q",  # Quiet
+                "-x",  # Exclude files
+                "**/__pycache__/*",  # Files to be excluded
+                "-r",  # Recurse paths
+                filename,  # Output filename
+                PACKAGE_PARENT_DIRECTORY,  # Files to be zipped
+            ],
+            cwd=self.base_dir,
+            check=True,  # Raises CalledProcessError if exit status is non-zero
+        )
+
+    def get_relative_path_of(self, subfile):
+        return os.path.join(self.base_dir, subfile)
+
+
+def build_packaged_zip():
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        package_builder = PackageBuilder(tmp_dir)
+        package_builder.make_directories()
+        package_builder.install_python_binaries()
+        package_builder.zip(DEST_ZIP_FILENAME)
+        shutil.copy(package_builder.get_relative_path_of(DEST_ZIP_FILENAME), DIST_DIR)
+
+
+build_packaged_zip()