99 lines
1.9 KiB
Go
99 lines
1.9 KiB
Go
package networkdb
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import "github.com/docker/go-events"
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type opType uint8
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const (
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opCreate opType = 1 + iota
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opUpdate
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opDelete
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)
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type event struct {
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Table string
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NetworkID string
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Key string
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Value []byte
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}
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// CreateEvent generates a table entry create event to the watchers
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type CreateEvent event
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// UpdateEvent generates a table entry update event to the watchers
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type UpdateEvent event
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// DeleteEvent generates a table entry delete event to the watchers
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type DeleteEvent event
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// Watch creates a watcher with filters for a particular table or
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// network or key or any combination of the tuple. If any of the
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// filter is an empty string it acts as a wildcard for that
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// field. Watch returns a channel of events, where the events will be
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// sent.
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func (nDB *NetworkDB) Watch(tname, nid, key string) (chan events.Event, func()) {
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var matcher events.Matcher
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if tname != "" || nid != "" || key != "" {
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matcher = events.MatcherFunc(func(ev events.Event) bool {
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var evt event
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switch ev := ev.(type) {
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case CreateEvent:
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evt = event(ev)
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case UpdateEvent:
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evt = event(ev)
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case DeleteEvent:
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evt = event(ev)
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}
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if tname != "" && evt.Table != tname {
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return false
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}
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if nid != "" && evt.NetworkID != nid {
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return false
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}
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if key != "" && evt.Key != key {
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return false
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}
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return true
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})
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}
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ch := events.NewChannel(0)
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sink := events.Sink(events.NewQueue(ch))
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if matcher != nil {
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sink = events.NewFilter(sink, matcher)
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}
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nDB.broadcaster.Add(sink)
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return ch.C, func() {
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nDB.broadcaster.Remove(sink)
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ch.Close()
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sink.Close()
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}
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}
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func makeEvent(op opType, tname, nid, key string, value []byte) events.Event {
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ev := event{
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Table: tname,
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NetworkID: nid,
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Key: key,
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Value: value,
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}
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switch op {
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case opCreate:
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return CreateEvent(ev)
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case opUpdate:
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return UpdateEvent(ev)
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case opDelete:
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return DeleteEvent(ev)
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}
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return nil
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}
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