Merge pull request #2694 from brady-gsa/events-tagging

adds tagging support for cloudwatch events service

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()
 
@@ -141,6 +143,9 @@ class EventsBackend(BaseBackend):
 
     def delete_rule(self, name):
         self.rules_order.pop(self.rules_order.index(name))
+        arn = self.rules.get(name).arn
+        if self.tagger.has_tags(arn):
+            self.tagger.delete_all_tags_for_resource(arn)
         return self.rules.pop(name) is not None
 
     def describe_rule(self, name):
@@ -361,6 +366,32 @@ 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 +1,62 @@
+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 delete_all_tags_for_resource(self, arn):
+        del self.tags[arn]
+
+    def has_tags(self, arn):
+        return arn in self.tags
+
+    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