[lambda] Implement ListFunctions, GetFunction, and DeleteFunction

moto/awslambda/responses.py

@@ -0,0 +1,78 @@
+from __future__ import unicode_literals
+
+import json
+import re
+
+from moto.core.responses import BaseResponse
+from .models import lambda_backends
+
+
+class LambdaResponse(BaseResponse):
+    
+    @classmethod
+    def root(cls, request, full_url, headers):
+        if request.method == 'GET':
+            return cls()._list_functions(request, full_url, headers)
+        elif request.method == 'POST':
+            return cls()._create_function(request, full_url, headers)
+        else:
+            raise ValueError("Cannot handle request")
+
+    @classmethod
+    def function(cls, request, full_url, headers):
+        if request.method == 'GET':
+            return cls()._get_function(request, full_url, headers)
+        elif request.method == 'DELETE':
+            return cls()._delete_function(request, full_url, headers)
+        else:
+            raise ValueError("Cannot handle request")
+
+    def _list_functions(self, request, full_url, headers):
+        lambda_backend = self.get_lambda_backend(full_url)
+        return 200, headers, json.dumps({
+            "Functions": [fn.get_configuration() for fn in lambda_backend.list_functions()],
+            "NextMarker": "aws-lambda-next-marker",
+        })
+
+    def _create_function(self, request, full_url, headers):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        spec = json.loads(request.body)
+        fn = lambda_backend.create_function(spec)
+        config = fn.get_configuration()
+        return 200, headers, json.dumps(config)
+
+    def _delete_function(self, request, full_url, headers):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        function_name = request.path.split('/')[-1]
+
+        if lambda_backend.has_function(function_name):
+            lambda_backend.delete_function(function_name)
+            return 204, headers, ""
+        else:
+            return 404, headers, "{}"
+
+    def _get_function(self, request, full_url, headers):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        function_name = request.path.split('/')[-1]
+
+        if lambda_backend.has_function(function_name):
+            fn = lambda_backend.get_function(function_name)
+            code = fn.get_code()
+            return 200, headers, json.dumps(code)
+        else:
+            return 404, headers, "{}"
+    
+    def get_lambda_backend(self, full_url):
+        from moto.awslambda.models import lambda_backends
+        region = self._get_aws_region(full_url)
+        return lambda_backends[region]
+
+    def _get_aws_region(self, full_url):
+        region = re.search(self.region_regex, full_url)
+        if region:
+            return region.group(1)
+        else:
+            return self.default_region