147 lines
6.8 KiB
Go
147 lines
6.8 KiB
Go
package pub
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import (
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"context"
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"github.com/go-fed/activity/streams/vocab"
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"net/url"
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)
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type Database interface {
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// Lock takes a lock for the object at the specified id. If an error
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// is returned, the lock must not have been taken.
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//
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// The lock must be able to succeed for an id that does not exist in
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// the database. This means acquiring the lock does not guarantee the
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// entry exists in the database.
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//
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// Locks are encouraged to be lightweight and in the Go layer, as some
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// processes require tight loops acquiring and releasing locks.
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//
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// Used to ensure race conditions in multiple requests do not occur.
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Lock(c context.Context, id *url.URL) error
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// Unlock makes the lock for the object at the specified id available.
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// If an error is returned, the lock must have still been freed.
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//
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// Used to ensure race conditions in multiple requests do not occur.
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Unlock(c context.Context, id *url.URL) error
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// InboxContains returns true if the OrderedCollection at 'inbox'
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// contains the specified 'id'.
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//
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// The library makes this call only after acquiring a lock first.
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InboxContains(c context.Context, inbox, id *url.URL) (contains bool, err error)
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// GetInbox returns the first ordered collection page of the outbox at
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// the specified IRI, for prepending new items.
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//
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// The library makes this call only after acquiring a lock first.
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GetInbox(c context.Context, inboxIRI *url.URL) (inbox vocab.ActivityStreamsOrderedCollectionPage, err error)
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// SetInbox saves the inbox value given from GetInbox, with new items
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// prepended. Note that the new items must not be added as independent
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// database entries. Separate calls to Create will do that.
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//
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// The library makes this call only after acquiring a lock first.
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SetInbox(c context.Context, inbox vocab.ActivityStreamsOrderedCollectionPage) error
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// Owns returns true if the database has an entry for the IRI and it
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// exists in the database.
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//
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// The library makes this call only after acquiring a lock first.
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Owns(c context.Context, id *url.URL) (owns bool, err error)
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// ActorForOutbox fetches the actor's IRI for the given outbox IRI.
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//
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// The library makes this call only after acquiring a lock first.
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ActorForOutbox(c context.Context, outboxIRI *url.URL) (actorIRI *url.URL, err error)
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// ActorForInbox fetches the actor's IRI for the given outbox IRI.
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//
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// The library makes this call only after acquiring a lock first.
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ActorForInbox(c context.Context, inboxIRI *url.URL) (actorIRI *url.URL, err error)
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// OutboxForInbox fetches the corresponding actor's outbox IRI for the
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// actor's inbox IRI.
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//
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// The library makes this call only after acquiring a lock first.
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OutboxForInbox(c context.Context, inboxIRI *url.URL) (outboxIRI *url.URL, err error)
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// InboxForActor fetches the inbox corresponding to the given actorIRI.
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//
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// It is acceptable to just return nil for the inboxIRI. In this case, the library will
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// attempt to resolve the inbox of the actor by remote dereferencing instead.
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//
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// The library makes this call only after acquiring a lock first.
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InboxForActor(c context.Context, actorIRI *url.URL) (inboxIRI *url.URL, err error)
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// Exists returns true if the database has an entry for the specified
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// id. It may not be owned by this application instance.
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//
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// The library makes this call only after acquiring a lock first.
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Exists(c context.Context, id *url.URL) (exists bool, err error)
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// Get returns the database entry for the specified id.
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//
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// The library makes this call only after acquiring a lock first.
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Get(c context.Context, id *url.URL) (value vocab.Type, err error)
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// Create adds a new entry to the database which must be able to be
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// keyed by its id.
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//
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// Note that Activity values received from federated peers may also be
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// created in the database this way if the Federating Protocol is
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// enabled. The client may freely decide to store only the id instead of
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// the entire value.
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//
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// The library makes this call only after acquiring a lock first.
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//
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// Under certain conditions and network activities, Create may be called
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// multiple times for the same ActivityStreams object.
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Create(c context.Context, asType vocab.Type) error
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// Update sets an existing entry to the database based on the value's
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// id.
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//
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// Note that Activity values received from federated peers may also be
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// updated in the database this way if the Federating Protocol is
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// enabled. The client may freely decide to store only the id instead of
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// the entire value.
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//
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// The library makes this call only after acquiring a lock first.
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Update(c context.Context, asType vocab.Type) error
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// Delete removes the entry with the given id.
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//
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// Delete is only called for federated objects. Deletes from the Social
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// Protocol instead call Update to create a Tombstone.
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//
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// The library makes this call only after acquiring a lock first.
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Delete(c context.Context, id *url.URL) error
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// GetOutbox returns the first ordered collection page of the outbox
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// at the specified IRI, for prepending new items.
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//
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// The library makes this call only after acquiring a lock first.
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GetOutbox(c context.Context, outboxIRI *url.URL) (outbox vocab.ActivityStreamsOrderedCollectionPage, err error)
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// SetOutbox saves the outbox value given from GetOutbox, with new items
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// prepended. Note that the new items must not be added as independent
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// database entries. Separate calls to Create will do that.
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//
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// The library makes this call only after acquiring a lock first.
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SetOutbox(c context.Context, outbox vocab.ActivityStreamsOrderedCollectionPage) error
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// NewID creates a new IRI id for the provided activity or object. The
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// implementation does not need to set the 'id' property and simply
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// needs to determine the value.
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//
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// The go-fed library will handle setting the 'id' property on the
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// activity or object provided with the value returned.
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NewID(c context.Context, t vocab.Type) (id *url.URL, err error)
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// Followers obtains the Followers Collection for an actor with the
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// given id.
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//
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// If modified, the library will then call Update.
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//
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// The library makes this call only after acquiring a lock first.
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Followers(c context.Context, actorIRI *url.URL) (followers vocab.ActivityStreamsCollection, err error)
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// Following obtains the Following Collection for an actor with the
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// given id.
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//
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// If modified, the library will then call Update.
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//
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// The library makes this call only after acquiring a lock first.
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Following(c context.Context, actorIRI *url.URL) (following vocab.ActivityStreamsCollection, err error)
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// Liked obtains the Liked Collection for an actor with the
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// given id.
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//
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// If modified, the library will then call Update.
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//
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// The library makes this call only after acquiring a lock first.
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Liked(c context.Context, actorIRI *url.URL) (liked vocab.ActivityStreamsCollection, err error)
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}
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