add Lambda tag_resource, untag_resource, and list_tags methods

moto/awslambda/models.py

@@ -81,6 +81,8 @@ class LambdaFunction(BaseModel):
         self.function_arn = 'arn:aws:lambda:123456789012:function:{0}'.format(
             self.function_name)
 
+        self.tags = dict()
+
     @property
     def vpc_config(self):
         config = self._vpc_config.copy()
@@ -278,6 +280,9 @@ class LambdaBackend(BaseBackend):
     def has_function(self, function_name):
         return function_name in self._functions
 
+    def has_function_arn(self, function_arn):
+        return self.get_function_by_arn(function_arn) is not None
+
     def create_function(self, spec):
         fn = LambdaFunction(spec)
         self._functions[fn.function_name] = fn
@@ -286,12 +291,33 @@ class LambdaBackend(BaseBackend):
     def get_function(self, function_name):
         return self._functions[function_name]
 
+    def get_function_by_arn(self, function_arn):
+        for function in self._functions.values():
+            if function.function_arn == function_arn:
+                return function
+        return None
+
     def delete_function(self, function_name):
         del self._functions[function_name]
 
     def list_functions(self):
         return self._functions.values()
 
+    def list_tags(self, resource):
+        return self.get_function_by_arn(resource).tags
+
+    def tag_resource(self, resource, tags):
+        self.get_function_by_arn(resource).tags.update(tags)
+
+    def untag_resource(self, resource, tagKeys):
+        function = self.get_function_by_arn(resource)
+        for key in tagKeys:
+            try:
+                del function.tags[key]
+            except KeyError:
+                pass
+                # Don't care
+
 
 def do_validate_s3():
     return os.environ.get('VALIDATE_LAMBDA_S3', '') in ['', '1', 'true']

moto/awslambda/responses.py

@@ -3,6 +3,12 @@ from __future__ import unicode_literals
 import json
 import re
 
+try:
+    from urllib import unquote
+    from urlparse import urlparse, parse_qs
+except:
+    from urllib.parse import unquote, urlparse, parse_qs
+
 from moto.core.responses import BaseResponse
 
 
@@ -33,6 +39,17 @@ class LambdaResponse(BaseResponse):
         else:
             raise ValueError("Cannot handle request")
 
+    def tag(self, request, full_url, headers):
+        self.setup_class(request, full_url, headers)
+        if request.method == 'GET':
+            return self._list_tags(request, full_url)
+        elif request.method == 'POST':
+            return self._tag_resource(request, full_url)
+        elif request.method == 'DELETE':
+            return self._untag_resource(request, full_url)
+        else:
+            raise ValueError("Cannot handle {0} request".format(request.method))
+
     def _invoke(self, request, full_url):
         response_headers = {}
         lambda_backend = self.get_lambda_backend(full_url)
@@ -102,3 +119,43 @@ class LambdaResponse(BaseResponse):
             return region.group(1)
         else:
             return self.default_region
+
+    def _list_tags(self, request, full_url):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        path = request.path if hasattr(request, 'path') else request.path_url
+        function_arn = unquote(path.split('/')[-1])
+
+        if lambda_backend.has_function_arn(function_arn):
+            function = lambda_backend.get_function_by_arn(function_arn)
+            return 200, {}, json.dumps(dict(Tags=function.tags))
+        else:
+            return 404, {}, "{}"
+
+    def _tag_resource(self, request, full_url):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        path = request.path if hasattr(request, 'path') else request.path_url
+        function_arn = unquote(path.split('/')[-1])
+
+        spec = json.loads(self.body)
+
+        if lambda_backend.has_function_arn(function_arn):
+            lambda_backend.tag_resource(function_arn, spec['Tags'])
+            return 200, {}, "{}"
+        else:
+            return 404, {}, "{}"
+
+    def _untag_resource(self, request, full_url):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        path = request.path if hasattr(request, 'path') else request.path_url
+        function_arn = unquote(path.split('/')[-1].split('?')[0])
+
+        tag_keys = parse_qs(urlparse(full_url).query)['tagKeys']
+
+        if lambda_backend.has_function_arn(function_arn):
+            lambda_backend.untag_resource(function_arn, tag_keys)
+            return 204, {}, "{}"
+        else:
+            return 404, {}, "{}"

moto/awslambda/urls.py

@@ -11,4 +11,5 @@ url_paths = {
     '{0}/(?P<api_version>[^/]+)/functions/?$': response.root,
     '{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/?$': response.function,
     '{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/invocations/?$': response.invoke,
+    '{0}/(?P<api_version>[^/]+)/tags/(?P<resource_arn>.+)': response.tag
 }

tests/test_awslambda/test_lambda.py

@@ -469,3 +469,89 @@ def test_invoke_lambda_error():
 
     assert 'FunctionError' in result
     assert result['FunctionError'] == 'Handled'
+
+@mock_lambda
+@mock_s3
+def test_tags():
+    """
+    test list_tags -> tag_resource -> list_tags -> tag_resource -> list_tags -> untag_resource -> list_tags integration
+    """
+    s3_conn = boto3.client('s3', 'us-west-2')
+    s3_conn.create_bucket(Bucket='test-bucket')
+
+    zip_content = get_test_zip_file2()
+    s3_conn.put_object(Bucket='test-bucket', Key='test.zip', Body=zip_content)
+    conn = boto3.client('lambda', 'us-west-2')
+
+    function = conn.create_function(
+        FunctionName='testFunction',
+        Runtime='python2.7',
+        Role='test-iam-role',
+        Handler='lambda_function.handler',
+        Code={
+            'S3Bucket': 'test-bucket',
+            'S3Key': 'test.zip',
+        },
+        Description='test lambda function',
+        Timeout=3,
+        MemorySize=128,
+        Publish=True,
+    )
+
+    # List tags when there are none
+    conn.list_tags(
+        Resource=function['FunctionArn']
+    )['Tags'].should.equal(dict())
+
+    # List tags when there is one
+    conn.tag_resource(
+        Resource=function['FunctionArn'],
+        Tags=dict(spam='eggs')
+    )['ResponseMetadata']['HTTPStatusCode'].should.equal(200)
+    conn.list_tags(
+        Resource=function['FunctionArn']
+    )['Tags'].should.equal(dict(spam='eggs'))
+
+    # List tags when another has been added
+    conn.tag_resource(
+        Resource=function['FunctionArn'],
+        Tags=dict(foo='bar')
+    )['ResponseMetadata']['HTTPStatusCode'].should.equal(200)
+    conn.list_tags(
+        Resource=function['FunctionArn']
+    )['Tags'].should.equal(dict(spam='eggs', foo='bar'))
+
+    # Untag resource
+    conn.untag_resource(
+        Resource=function['FunctionArn'],
+        TagKeys=['spam', 'trolls']
+    )['ResponseMetadata']['HTTPStatusCode'].should.equal(204)
+    conn.list_tags(
+        Resource=function['FunctionArn']
+    )['Tags'].should.equal(dict(foo='bar'))
+
+    # Untag a tag that does not exist (no error and no change)
+    conn.untag_resource(
+        Resource=function['FunctionArn'],
+        TagKeys=['spam']
+    )['ResponseMetadata']['HTTPStatusCode'].should.equal(204)
+
+@mock_lambda
+def test_tags_not_found():
+    """
+    Test list_tags and tag_resource when the lambda with the given arn does not exist
+    """
+    conn = boto3.client('lambda', 'us-west-2')
+    conn.list_tags.when.called_with(
+        Resource='arn:aws:lambda:123456789012:function:not-found'
+    ).should.throw(botocore.client.ClientError)
+
+    conn.tag_resource.when.called_with(
+        Resource='arn:aws:lambda:123456789012:function:not-found',
+        Tags=dict(spam='eggs')
+    ).should.throw(botocore.client.ClientError)
+
+    conn.untag_resource.when.called_with(
+        Resource='arn:aws:lambda:123456789012:function:not-found',
+        TagKeys=['spam']
+    ).should.throw(botocore.client.ClientError)