148 lines
5.1 KiB
Go
148 lines
5.1 KiB
Go
package notifications
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import (
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"fmt"
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"time"
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"github.com/docker/distribution"
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)
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// EventAction constants used in action field of Event.
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const (
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EventActionPull = "pull"
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EventActionPush = "push"
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EventActionDelete = "delete"
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)
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const (
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// EventsMediaType is the mediatype for the json event envelope. If the
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// Event, ActorRecord, SourceRecord or Envelope structs change, the version
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// number should be incremented.
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EventsMediaType = "application/vnd.docker.distribution.events.v1+json"
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// LayerMediaType is the media type for image rootfs diffs (aka "layers")
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// used by Docker. We don't expect this to change for quite a while.
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layerMediaType = "application/vnd.docker.container.image.rootfs.diff+x-gtar"
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)
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// Envelope defines the fields of a json event envelope message that can hold
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// one or more events.
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type Envelope struct {
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// Events make up the contents of the envelope. Events present in a single
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// envelope are not necessarily related.
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Events []Event `json:"events,omitempty"`
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}
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// TODO(stevvooe): The event type should be separate from the json format. It
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// should be defined as an interface. Leaving as is for now since we don't
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// need that at this time. If we make this change, the struct below would be
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// called "EventRecord".
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// Event provides the fields required to describe a registry event.
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type Event struct {
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// ID provides a unique identifier for the event.
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ID string `json:"id,omitempty"`
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// Timestamp is the time at which the event occurred.
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Timestamp time.Time `json:"timestamp,omitempty"`
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// Action indicates what action encompasses the provided event.
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Action string `json:"action,omitempty"`
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// Target uniquely describes the target of the event.
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Target struct {
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// TODO(stevvooe): Use http.DetectContentType for layers, maybe.
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distribution.Descriptor
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// Repository identifies the named repository.
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Repository string `json:"repository,omitempty"`
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// URL provides a direct link to the content.
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URL string `json:"url,omitempty"`
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} `json:"target,omitempty"`
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// Request covers the request that generated the event.
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Request RequestRecord `json:"request,omitempty"`
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// Actor specifies the agent that initiated the event. For most
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// situations, this could be from the authorizaton context of the request.
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Actor ActorRecord `json:"actor,omitempty"`
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// Source identifies the registry node that generated the event. Put
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// differently, while the actor "initiates" the event, the source
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// "generates" it.
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Source SourceRecord `json:"source,omitempty"`
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}
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// ActorRecord specifies the agent that initiated the event. For most
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// situations, this could be from the authorizaton context of the request.
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// Data in this record can refer to both the initiating client and the
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// generating request.
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type ActorRecord struct {
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// Name corresponds to the subject or username associated with the
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// request context that generated the event.
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Name string `json:"name,omitempty"`
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// TODO(stevvooe): Look into setting a session cookie to get this
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// without docker daemon.
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// SessionID
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// TODO(stevvooe): Push the "Docker-Command" header to replace cookie and
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// get the actual command.
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// Command
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}
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// RequestRecord covers the request that generated the event.
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type RequestRecord struct {
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// ID uniquely identifies the request that initiated the event.
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ID string `json:"id"`
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// Addr contains the ip or hostname and possibly port of the client
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// connection that initiated the event. This is the RemoteAddr from
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// the standard http request.
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Addr string `json:"addr,omitempty"`
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// Host is the externally accessible host name of the registry instance,
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// as specified by the http host header on incoming requests.
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Host string `json:"host,omitempty"`
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// Method has the request method that generated the event.
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Method string `json:"method"`
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// UserAgent contains the user agent header of the request.
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UserAgent string `json:"useragent"`
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}
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// SourceRecord identifies the registry node that generated the event. Put
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// differently, while the actor "initiates" the event, the source "generates"
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// it.
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type SourceRecord struct {
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// Addr contains the ip or hostname and the port of the registry node
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// that generated the event. Generally, this will be resolved by
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// os.Hostname() along with the running port.
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Addr string `json:"addr,omitempty"`
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// InstanceID identifies a running instance of an application. Changes
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// after each restart.
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InstanceID string `json:"instanceID,omitempty"`
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}
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var (
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// ErrSinkClosed is returned if a write is issued to a sink that has been
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// closed. If encountered, the error should be considered terminal and
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// retries will not be successful.
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ErrSinkClosed = fmt.Errorf("sink: closed")
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)
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// Sink accepts and sends events.
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type Sink interface {
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// Write writes one or more events to the sink. If no error is returned,
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// the caller will assume that all events have been committed and will not
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// try to send them again. If an error is received, the caller may retry
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// sending the event. The caller should cede the slice of memory to the
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// sink and not modify it after calling this method.
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Write(events ...Event) error
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// Close the sink, possibly waiting for pending events to flush.
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Close() error
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}
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