52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
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package submatview
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import "github.com/hashicorp/consul/proto/pbsubscribe"
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type eventHandler func(events *pbsubscribe.Event) (eventHandler, error)
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func (m *Materializer) initialHandler(index uint64) eventHandler {
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if index == 0 {
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return newSnapshotHandler(m)
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}
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return m.resumeStreamHandler
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}
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type snapshotHandler struct {
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material *Materializer
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events []*pbsubscribe.Event
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}
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func newSnapshotHandler(m *Materializer) eventHandler {
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return (&snapshotHandler{material: m}).handle
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}
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func (h *snapshotHandler) handle(event *pbsubscribe.Event) (eventHandler, error) {
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if event.GetEndOfSnapshot() {
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err := h.material.updateView(h.events, event.Index)
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return h.material.eventStreamHandler, err
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}
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h.events = append(h.events, eventsFromEvent(event)...)
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return h.handle, nil
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}
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func (m *Materializer) eventStreamHandler(event *pbsubscribe.Event) (eventHandler, error) {
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err := m.updateView(eventsFromEvent(event), event.Index)
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return m.eventStreamHandler, err
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}
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func eventsFromEvent(event *pbsubscribe.Event) []*pbsubscribe.Event {
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if batch := event.GetEventBatch(); batch != nil {
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return batch.Events
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}
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return []*pbsubscribe.Event{event}
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}
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func (m *Materializer) resumeStreamHandler(event *pbsubscribe.Event) (eventHandler, error) {
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if event.GetNewSnapshotToFollow() {
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m.reset()
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return newSnapshotHandler(m), nil
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}
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return m.eventStreamHandler(event)
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}
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