add tagging support to events

moto/events/models.py

@@ -6,6 +6,7 @@ from boto3 import Session
 from moto.core.exceptions import JsonRESTError
 from moto.core import BaseBackend, BaseModel
 from moto.sts.models import ACCOUNT_ID
+from moto.utilities.tagging_service import TaggingService
 
 
 class Rule(BaseModel):
@@ -104,6 +105,7 @@ class EventsBackend(BaseBackend):
         self.region_name = region_name
         self.event_buses = {}
         self.event_sources = {}
+        self.tagger = TaggingService()
 
         self._add_default_event_bus()
 
@@ -361,6 +363,32 @@ class EventsBackend(BaseBackend):
 
         self.event_buses.pop(name, None)
 
+    def list_tags_for_resource(self, arn):
+        name = arn.split("/")[-1]
+        if name in self.rules:
+            return self.tagger.list_tags_for_resource(self.rules[name].arn)
+        raise JsonRESTError(
+            "ResourceNotFoundException", "An entity that you specified does not exist."
+        )
+
+    def tag_resource(self, arn, tags):
+        name = arn.split("/")[-1]
+        if name in self.rules:
+            self.tagger.tag_resource(self.rules[name].arn, tags)
+            return {}
+        raise JsonRESTError(
+            "ResourceNotFoundException", "An entity that you specified does not exist."
+        )
+
+    def untag_resource(self, arn, tag_names):
+        name = arn.split("/")[-1]
+        if name in self.rules:
+            self.tagger.untag_resource_using_names(self.rules[name].arn, tag_names)
+            return {}
+        raise JsonRESTError(
+            "ResourceNotFoundException", "An entity that you specified does not exist."
+        )
+
 
 events_backends = {}
 for region in Session().get_available_regions("events"):

moto/events/responses.py

@@ -297,3 +297,26 @@ class EventsHandler(BaseResponse):
         self.events_backend.delete_event_bus(name)
 
         return "", self.response_headers
+
+    def list_tags_for_resource(self):
+        arn = self._get_param("ResourceARN")
+
+        result = self.events_backend.list_tags_for_resource(arn)
+
+        return json.dumps(result), self.response_headers
+
+    def tag_resource(self):
+        arn = self._get_param("ResourceARN")
+        tags = self._get_param("Tags")
+
+        result = self.events_backend.tag_resource(arn, tags)
+
+        return json.dumps(result), self.response_headers
+
+    def untag_resource(self):
+        arn = self._get_param("ResourceARN")
+        tags = self._get_param("TagKeys")
+
+        result = self.events_backend.untag_resource(arn, tags)
+
+        return json.dumps(result), self.response_headers

moto/utilities/tagging_service.py

@@ -0,0 +1,56 @@
+class TaggingService:
+    def __init__(self, tagName="Tags", keyName="Key", valueName="Value"):
+        self.tagName = tagName
+        self.keyName = keyName
+        self.valueName = valueName
+        self.tags = {}
+
+    def list_tags_for_resource(self, arn):
+        result = []
+        if arn in self.tags:
+            for k, v in self.tags[arn].items():
+                result.append({self.keyName: k, self.valueName: v})
+        return {self.tagName: result}
+
+    def tag_resource(self, arn, tags):
+        if arn not in self.tags:
+            self.tags[arn] = {}
+        for t in tags:
+            if self.valueName in t:
+                self.tags[arn][t[self.keyName]] = t[self.valueName]
+            else:
+                self.tags[arn][t[self.keyName]] = None
+
+    def untag_resource_using_names(self, arn, tag_names):
+        for name in tag_names:
+            if name in self.tags.get(arn, {}):
+                del self.tags[arn][name]
+
+    def untag_resource_using_tags(self, arn, tags):
+        m = self.tags.get(arn, {})
+        for t in tags:
+            if self.keyName in t:
+                if t[self.keyName] in m:
+                    if self.valueName in t:
+                        if m[t[self.keyName]] != t[self.valueName]:
+                            continue
+                    # If both key and value are provided, match both before deletion
+                    del m[t[self.keyName]]
+
+    def extract_tag_names(self, tags):
+        results = []
+        if len(tags) == 0:
+            return results
+        for tag in tags:
+            if self.keyName in tag:
+                results.append(tag[self.keyName])
+        return results
+
+    def flatten_tag_list(self, tags):
+        result = {}
+        for t in tags:
+            if self.valueName in t:
+                result[t[self.keyName]] = t[self.valueName]
+            else:
+                result[t[self.keyName]] = None
+        return result

tests/test_events/test_events.py

@@ -1,12 +1,15 @@
-import random
-import boto3
 import json
-import sure  # noqa
+import random
+import unittest
 
-from moto.events import mock_events
+import boto3
 from botocore.exceptions import ClientError
 from nose.tools import assert_raises
+
 from moto.core import ACCOUNT_ID
+from moto.core.exceptions import JsonRESTError
+from moto.events import mock_events
+from moto.events.models import EventsBackend
 
 RULES = [
     {"Name": "test1", "ScheduleExpression": "rate(5 minutes)"},
@@ -136,14 +139,6 @@ def test_list_rule_names_by_target():
         assert rule in test_2_target["Rules"]
 
 
-@mock_events
-def test_list_rules():
-    client = generate_environment()
-
-    rules = client.list_rules()
-    assert len(rules["Rules"]) == len(RULES)
-
-
 @mock_events
 def test_delete_rule():
     client = generate_environment()
@@ -461,3 +456,58 @@ def test_delete_event_bus_errors():
     client.delete_event_bus.when.called_with(Name="default").should.throw(
         ClientError, "Cannot delete event bus default."
     )
+
+
+@mock_events
+def test_rule_tagging_happy():
+    client = generate_environment()
+    rule_name = get_random_rule()["Name"]
+    rule_arn = client.describe_rule(Name=rule_name).get("Arn")
+
+    tags = [{"Key": "key1", "Value": "value1"}, {"Key": "key2", "Value": "value2"}]
+    client.tag_resource(ResourceARN=rule_arn, Tags=tags)
+
+    actual = client.list_tags_for_resource(ResourceARN=rule_arn).get("Tags")
+    tc = unittest.TestCase("__init__")
+    expected = [{"Value": "value1", "Key": "key1"}, {"Value": "value2", "Key": "key2"}]
+    tc.assertTrue(
+        (expected[0] == actual[0] and expected[1] == actual[1])
+        or (expected[1] == actual[0] and expected[0] == actual[1])
+    )
+
+    client.untag_resource(ResourceARN=rule_arn, TagKeys=["key1"])
+
+    actual = client.list_tags_for_resource(ResourceARN=rule_arn).get("Tags")
+    expected = [{"Key": "key2", "Value": "value2"}]
+    assert expected == actual
+
+
+def freeze_dict(obj):
+    if isinstance(obj, dict):
+        dict_items = list(obj.items())
+        dict_items.append(("__frozen__", True))
+        return tuple([(k, freeze_dict(v)) for k, v in dict_items])
+    return obj
+
+
+@mock_events
+def test_rule_tagging_sad():
+    b = EventsBackend("us-west-2")
+
+    try:
+        b.tag_resource("unknown", [])
+        raise "tag_resource should fail if ResourceARN is not known"
+    except JsonRESTError:
+        pass
+
+    try:
+        b.untag_resource("unknown", [])
+        raise "untag_resource should fail if ResourceARN is not known"
+    except JsonRESTError:
+        pass
+
+    try:
+        b.list_tags_for_resource("unknown")
+        raise "list_tags_for_resource should fail if ResourceARN is not known"
+    except JsonRESTError:
+        pass

tests/test_utilities/test_tagging_service.py

@@ -0,0 +1,59 @@
+import unittest
+
+from moto.utilities.tagging_service import TaggingService
+
+
+class TestTaggingService(unittest.TestCase):
+    def test_list_empty(self):
+        svc = TaggingService()
+        result = svc.list_tags_for_resource("test")
+        self.assertEqual(result, {"Tags": []})
+
+    def test_create_tag(self):
+        svc = TaggingService("TheTags", "TagKey", "TagValue")
+        tags = [{"TagKey": "key_key", "TagValue": "value_value"}]
+        svc.tag_resource("arn", tags)
+        actual = svc.list_tags_for_resource("arn")
+        expected = {"TheTags": [{"TagKey": "key_key", "TagValue": "value_value"}]}
+        self.assertDictEqual(expected, actual)
+
+    def test_create_tag_without_value(self):
+        svc = TaggingService()
+        tags = [{"Key": "key_key"}]
+        svc.tag_resource("arn", tags)
+        actual = svc.list_tags_for_resource("arn")
+        expected = {"Tags": [{"Key": "key_key", "Value": None}]}
+        self.assertDictEqual(expected, actual)
+
+    def test_delete_tag_using_names(self):
+        svc = TaggingService()
+        tags = [{"Key": "key_key", "Value": "value_value"}]
+        svc.tag_resource("arn", tags)
+        svc.untag_resource_using_names("arn", ["key_key"])
+        result = svc.list_tags_for_resource("arn")
+        self.assertEqual(result, {"Tags": []})
+
+    def test_list_empty_delete(self):
+        svc = TaggingService()
+        svc.untag_resource_using_names("arn", ["key_key"])
+        result = svc.list_tags_for_resource("arn")
+        self.assertEqual(result, {"Tags": []})
+
+    def test_delete_tag_using_tags(self):
+        svc = TaggingService()
+        tags = [{"Key": "key_key", "Value": "value_value"}]
+        svc.tag_resource("arn", tags)
+        svc.untag_resource_using_tags("arn", tags)
+        result = svc.list_tags_for_resource("arn")
+        self.assertEqual(result, {"Tags": []})
+
+    def test_extract_tag_names(self):
+        svc = TaggingService()
+        tags = [{"Key": "key1", "Value": "value1"}, {"Key": "key2", "Value": "value2"}]
+        actual = svc.extract_tag_names(tags)
+        expected = ["key1", "key2"]
+        self.assertEqual(expected, actual)
+
+
+if __name__ == "__main__":
+    unittest.main()