Add lambda builder

setup.py

@@ -13,7 +13,7 @@
     url="https://github.com/brwyatt/Ophiuchus",
     packages=find_packages(where="src"),
     package_dir={"": "src"},
-    package_data={},
+    package_data={"ophiuchus": ["templates/lambdas/*"]},
     python_requires="~=3.6",
     include_package_data=False,
     entry_points={
@@ -23,6 +23,6 @@
             "build = ophiuchus.cli.build:Build",
         ],
     },
-    install_requires=["boto3>=1.10.0,<1.11.0"],
+    install_requires=["boto3>=1.10.0,<1.11.0", "Jinja2>=2.10.0,<2.11.0"],
     tests_require=["aiohttp>=3.6.0,<3.7.0"],
 )

src/ophiuchus/cli/build.py

@@ -6,6 +6,8 @@
 from shutil import rmtree
 from typing import List
 
+import jinja2
+import pkg_resources
 from ophiuchus.cli.subcommands import EntryPointBuilderSubcommand
 from ophiuchus.framework import GlobalConfig
 from ophiuchus.framework import Handler
@@ -105,6 +107,12 @@ def build_site_group(
             requirements_file=requirements_file,
         )
 
+        self.build_lambdas(
+            site_group=site_group,
+            site_group_lambda_dir=site_group_lambda_dir,
+            site_group_packages_dir=site_group_packages_dir,
+        )
+
     def install_package(
         self,
         site_group_packages_dir: str,
@@ -128,3 +136,29 @@ def install_package(
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
         )
+
+    def build_lambdas(
+        self,
+        site_group: str,
+        site_group_lambda_dir: str,
+        site_group_packages_dir: str,
+    ):
+        self.log.debug("Creating site group lambda directory")
+        os.makedirs(site_group_lambda_dir, exist_ok=True)
+
+        working_set = pkg_resources.WorkingSet(
+            entries=[site_group_packages_dir],
+        )
+
+        env = jinja2.Environment(
+            loader=jinja2.PackageLoader("ophiuchus", "templates"),
+        )
+        template = env.get_template("lambdas/handler.py.template")
+        for name, ep in load_entry_points(
+            site_group, Handler, working_set,
+        ).items():
+            file_name = os.path.join(site_group_lambda_dir, f"{name}.py")
+            with open(file_name, "w") as f:
+                f.write(
+                    template.render(module=ep.__module__, name=ep.__name__),
+                )

src/ophiuchus/templates/lambdas/handler.py.template

@@ -0,0 +1,18 @@
+# Auto-generated by Ophiuchus Build
+import json
+import logging
+
+from ophiuchus.framework import GlobalConfig
+
+from {{ module }} import {{ name }}
+
+log = logging.getLogger(__name__)
+
+config = GlobalConfig.from_file("/opt/config.json")
+
+real_handler = {{ name }}(config)
+
+def handler(event, context):
+    method = event.get('httpMethod', '').upper()
+    if hasattr(real_handler, method):
+        return getattr(real_handler, method)(event, context)