34 lines
1.3 KiB
Go
34 lines
1.3 KiB
Go
package state
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import (
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"github.com/hashicorp/consul/agent/consul/stream"
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memdb "github.com/hashicorp/go-memdb"
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)
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// topicHandler provides functions which create stream.Events for a topic.
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type topicHandler struct {
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// Snapshot creates the necessary events to reproduce the current state and
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// appends them to the EventBuffer.
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Snapshot func(*stream.SubscribeRequest, *stream.EventBuffer) (index uint64, err error)
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// ProcessChanges accepts a slice of Changes, and builds a slice of events for
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// those changes.
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ProcessChanges func(*txn, memdb.Changes) ([]stream.Event, error)
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}
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// newTopicHandlers returns the default handlers for state change events.
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func newTopicHandlers() map[stream.Topic]topicHandler {
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return map[stream.Topic]topicHandler{
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// For now we don't actually support subscribing to ACL* topics externally
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// so these have no Snapshot methods yet. We do need to have a
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// ProcessChanges func to publish the partial events on ACL changes though
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// so that we can invalidate other subscriptions if their effective ACL
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// permissions change.
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stream.Topic_ACLTokens: {
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ProcessChanges: aclEventsFromChanges,
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},
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// Note no ACLPolicies/ACLRoles defined yet because we publish all events
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// from one handler to save on iterating/filtering and duplicating code and
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// there are no snapshots for these yet per comment above.
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}
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}
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