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diff --git a/doc/radosgw/notifications.rst b/doc/radosgw/notifications.rst new file mode 100644 index 00000000..3fd7f2d5 --- /dev/null +++ b/doc/radosgw/notifications.rst @@ -0,0 +1,325 @@ +==================== +Bucket Notifications +==================== + +.. versionadded:: Nautilus + +.. contents:: + +Bucket notifications provide a mechanism for sending information out of the radosgw when certain events are happening on the bucket. +Currently, notifications could be sent to: HTTP, AMQP0.9.1 and Kafka endpoints. + +Note, that if the events should be stored in Ceph, in addition, or instead of being pushed to an endpoint, +the `PubSub Module`_ should be used instead of the bucket notification mechanism. + +A user can create different topics. A topic entity is defined by its user and its name. A +user can only manage its own topics, and can only associate them with buckets it owns. + +In order to send notifications for events for a specific bucket, a notification entity needs to be created. A +notification can be created on a subset of event types, or for all event types (default). +The notification may also filter out events based on prefix/suffix and/or regular expression matching of the keys. As well as, +on the metadata attributes attached to the object, or the object tags. +There can be multiple notifications for any specific topic, and the same topic could be used for multiple notifications. + +REST API has been defined to provide configuration and control interfaces for the bucket notification +mechanism. This API is similar to the one defined as S3-compatible API of the pubsub sync module. + +.. toctree:: + :maxdepth: 1 + + S3 Bucket Notification Compatibility <s3-notification-compatibility> + +Notificatios Performance Stats +------------------------------ +Same counters are shared between the pubsub sync module and the bucket notification mechanism. + +- ``pubsub_event_triggered``: running counter of events with at lease one topic associated with them +- ``pubsub_event_lost``: running counter of events that had topics associated with them but that were not pushed to any of the endpoints +- ``pubsub_push_ok``: running counter, for all notifications, of events successfully pushed to their endpoint +- ``pubsub_push_fail``: running counter, for all notifications, of events failed to be pushed to their endpoint +- ``pubsub_push_pending``: gauge value of events pushed to an endpoint but not acked or nacked yet + +.. note:: + + ``pubsub_event_triggered`` and ``pubsub_event_lost`` are incremented per event, while: + ``pubsub_push_ok``, ``pubsub_push_fail``, are incremented per push action on each notification. + +Bucket Notification REST API +---------------------------- + +Topics +~~~~~~ + +Create a Topic +`````````````` + +This will create a new topic. The topic should be provided with push endpoint parameters that would be used later +when a notification is created. +Upon successful request, the response will include the topic ARN that could be later used to reference this topic in the notification request. +To update a topic, use the same command used for topic creation, with the topic name of an existing topic and different endpoint values. + +.. tip:: Any notification already associated with the topic needs to be re-created for the topic update to take effect + +:: + + POST + Action=CreateTopic + &Name=<topic-name> + &push-endpoint=<endpoint> + [&Attributes.entry.1.key=amqp-exchange&Attributes.entry.1.value=<exchange>] + [&Attributes.entry.2.key=amqp-ack-level&Attributes.entry.2.value=none|broker] + [&Attributes.entry.3.key=verify-ssl&Attributes.entry.3.value=true|false] + [&Attributes.entry.4.key=kafka-ack-level&Attributes.entry.4.value=none|broker] + [&Attributes.entry.5.key=use-ssl&Attributes.entry.5.value=true|false] + [&Attributes.entry.6.key=ca-location&Attributes.entry.6.value=<file path>] + [&Attributes.entry.7.key=OpaqueData&Attributes.entry.7.value=<opaque data>] + +Request parameters: + +- push-endpoint: URI of an endpoint to send push notification to +- OpaqueData: opaque data is set in the topic configuration and added to all notifications triggered by the ropic + +- HTTP endpoint + + - URI: ``http[s]://<fqdn>[:<port]`` + - port defaults to: 80/443 for HTTP/S accordingly + - verify-ssl: indicate whether the server certificate is validated by the client or not ("true" by default) + +- AMQP0.9.1 endpoint + + - URI: ``amqp://[<user>:<password>@]<fqdn>[:<port>][/<vhost>]`` + - user/password defaults to: guest/guest + - user/password may only be provided over HTTPS. Topic creation request will be rejected if not + - port defaults to: 5672 + - vhost defaults to: "/" + - amqp-exchange: the exchanges must exist and be able to route messages based on topics (mandatory parameter for AMQP0.9.1) + - amqp-ack-level: no end2end acking is required, as messages may persist in the broker before delivered into their final destination. Two ack methods exist: + + - "none": message is considered "delivered" if sent to broker + - "broker": message is considered "delivered" if acked by broker (default) + +- Kafka endpoint + + - URI: ``kafka://[<user>:<password>@]<fqdn>[:<port]`` + - if ``use-ssl`` is set to "true", secure connection will be used for connecting with the broker ("false" by default) + - if ``ca-location`` is provided, and secure connection is used, the specified CA will be used, instead of the default one, to authenticate the broker + - user/password may only be provided over HTTPS. Topic creation request will be rejected if not + - user/password may only be provided together with ``use-ssl``, connection to the broker would fail if not + - port defaults to: 9092 + - kafka-ack-level: no end2end acking is required, as messages may persist in the broker before delivered into their final destination. Two ack methods exist: + + - "none": message is considered "delivered" if sent to broker + - "broker": message is considered "delivered" if acked by broker (default) + +.. note:: + + - The key/value of a specific parameter does not have to reside in the same line, or in any specific order, but must use the same index + - Attribute indexing does not need to be sequntial or start from any specific value + - `AWS Create Topic`_ has detailed explanation on endpoint attributes format. However, in our case different keys and values are used + +The response will have the following format: + +:: + + <CreateTopicResponse xmlns="https://sns.amazonaws.com/doc/2010-03-31/"> + <CreateTopicResult> + <TopicArn></TopicArn> + </CreateTopicResult> + <ResponseMetadata> + <RequestId></RequestId> + </ResponseMetadata> + </CreateTopicResponse> + +The topic ARN in the response will have the following format: + +:: + + arn:aws:sns:<zone-group>:<tenant>:<topic> + +Get Topic Information +````````````````````` + +Returns information about specific topic. This includes push-endpoint information, if provided. + +:: + + POST + Action=GetTopic&TopicArn=<topic-arn> + +Response will have the following format: + +:: + + <GetTopicResponse> + <GetTopicRersult> + <Topic> + <User></User> + <Name></Name> + <EndPoint> + <EndpointAddress></EndpointAddress> + <EndpointArgs></EndpointArgs> + <EndpointTopic></EndpointTopic> + </EndPoint> + <TopicArn></TopicArn> + <OpaqueData></OpaqueData> + </Topic> + </GetTopicResult> + <ResponseMetadata> + <RequestId></RequestId> + </ResponseMetadata> + </GetTopicResponse> + +- User: name of the user that created the topic +- Name: name of the topic +- EndPoinjtAddress: the push-endpoint URL +- if endpoint URL contain user/password information, request must be made over HTTPS. Topic get request will be rejected if not +- EndPointArgs: the push-endpoint args +- EndpointTopic: the topic name that should be sent to the endpoint (mat be different than the above topic name) +- TopicArn: topic ARN + +Delete Topic +```````````` + +:: + + POST + Action=DeleteTopic&TopicArn=<topic-arn> + +Delete the specified topic. Note that deleting a deleted topic should result with no-op and not a failure. + +The response will have the following format: + +:: + + <DeleteTopicResponse xmlns="https://sns.amazonaws.com/doc/2010-03-31/"> + <ResponseMetadata> + <RequestId></RequestId> + </ResponseMetadata> + </DeleteTopicResponse> + +List Topics +``````````` + +List all topics that user defined. + +:: + + POST + Action=ListTopics + +Response will have the following format: + +:: + + <ListTopicdResponse xmlns="https://sns.amazonaws.com/doc/2010-03-31/"> + <ListTopicsRersult> + <Topics> + <member> + <User></User> + <Name></Name> + <EndPoint> + <EndpointAddress></EndpointAddress> + <EndpointArgs></EndpointArgs> + <EndpointTopic></EndpointTopic> + </EndPoint> + <TopicArn></TopicArn> + <OpaqueData></OpaqueData> + </member> + </Topics> + </ListTopicsResult> + <ResponseMetadata> + <RequestId></RequestId> + </ResponseMetadata> + </ListTopicsResponse> + +- if endpoint URL contain user/password information, in any of the topic, request must be made over HTTPS. Topic list request will be rejected if not + +Notifications +~~~~~~~~~~~~~ + +Detailed under: `Bucket Operations`_. + +.. note:: + + - "Abort Multipart Upload" request does not emit a notification + - "Delete Multiple Objects" request does not emit a notification + - Both "Initiate Multipart Upload" and "POST Object" requests will emit an ``s3:ObjectCreated:Post`` notification + + +Events +~~~~~~ + +The events are in JSON format (regardless of the actual endpoint), and share the same structure as the S3-compatible events +pushed or pulled using the pubsub sync module. + +:: + + {"Records":[ + { + "eventVersion":"2.1" + "eventSource":"aws:s3", + "awsRegion":"", + "eventTime":"", + "eventName":"", + "userIdentity":{ + "principalId":"" + }, + "requestParameters":{ + "sourceIPAddress":"" + }, + "responseElements":{ + "x-amz-request-id":"", + "x-amz-id-2":"" + }, + "s3":{ + "s3SchemaVersion":"1.0", + "configurationId":"", + "bucket":{ + "name":"", + "ownerIdentity":{ + "principalId":"" + }, + "arn":"", + "id:"" + }, + "object":{ + "key":"", + "size":"", + "eTag":"", + "versionId":"", + "sequencer": "", + "metadata":[], + "tags":[] + } + }, + "eventId":"", + "opaqueData":"", + } + ]} + +- awsRegion: zonegroup +- eventTime: timestamp indicating when the event was triggered +- eventName: for list of supported events see: `S3 Notification Compatibility`_ +- userIdentity.principalId: user that triggered the change +- requestParameters.sourceIPAddress: not supported +- responseElements.x-amz-request-id: request ID of the original change +- responseElements.x_amz_id_2: RGW on which the change was made +- s3.configurationId: notification ID that created the event +- s3.bucket.name: name of the bucket +- s3.bucket.ownerIdentity.principalId: owner of the bucket +- s3.bucket.arn: ARN of the bucket +- s3.bucket.id: Id of the bucket (an extension to the S3 notification API) +- s3.object.key: object key +- s3.object.size: object size +- s3.object.eTag: object etag +- s3.object.version: object version in case of versioned bucket +- s3.object.sequencer: monotonically increasing identifier of the change per object (hexadecimal format) +- s3.object.metadata: any metadata set on the object sent as: ``x-amz-meta-`` (an extension to the S3 notification API) +- s3.object.tags: any tags set on the objcet (an extension to the S3 notification API) +- s3.eventId: unique ID of the event, that could be used for acking (an extension to the S3 notification API) +- s3.opaqueData: opaque data is set in the topic configuration and added to all notifications triggered by the ropic (an extension to the S3 notification API) + +.. _PubSub Module : ../pubsub-module +.. _S3 Notification Compatibility: ../s3-notification-compatibility +.. _AWS Create Topic: https://docs.aws.amazon.com/sns/latest/api/API_CreateTopic.html +.. _Bucket Operations: ../s3/bucketops |