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event_watch_manager.go
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/
event_watch_manager.go
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package engine
import (
"context"
"github.com/pkg/errors"
v1 "k8s.io/api/core/v1"
"github.com/windmilleng/tilt/internal/k8s"
"github.com/windmilleng/tilt/internal/store"
)
type EventWatchManager struct {
kClient k8s.Client
watching bool
}
func NewEventWatchManager(kClient k8s.Client) *EventWatchManager {
return &EventWatchManager{
kClient: kClient,
}
}
func (m *EventWatchManager) needsWatch(st store.RStore) bool {
if !k8sEventsFeatureFlagOn() {
return false
}
state := st.RLockState()
defer st.RUnlockState()
atLeastOneK8s := false
for _, m := range state.Manifests() {
if m.IsK8s() {
atLeastOneK8s = true
}
}
return atLeastOneK8s && state.WatchFiles && !m.watching
}
func (m *EventWatchManager) OnChange(ctx context.Context, st store.RStore) {
if !m.needsWatch(st) {
return
}
m.watching = true
ch, err := m.kClient.WatchEvents(ctx)
if err != nil {
err = errors.Wrap(err, "Error watching k8s events\n")
st.Dispatch(NewErrorAction(err))
return
}
go m.dispatchEventsLoop(ctx, ch, st)
}
func (m *EventWatchManager) dispatchEventsLoop(ctx context.Context, ch <-chan *v1.Event, st store.RStore) {
for {
select {
case event, ok := <-ch:
if !ok {
return
}
st.Dispatch(store.NewK8sEventAction(event))
case <-ctx.Done():
return
}
}
}