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|
package sotw
import (
"context"
"reflect"
discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
"github.com/envoyproxy/go-control-plane/pkg/cache/types"
"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
)
// watches for all xDS resource types
type watches struct {
responders map[string]*watch
// cases is a dynamic select case for the watched channels.
cases []reflect.SelectCase
}
// newWatches creates and initializes watches.
func newWatches() watches {
return watches{
responders: make(map[string]*watch, int(types.UnknownType)),
cases: make([]reflect.SelectCase, 0),
}
}
// addWatch creates a new watch entry in the watches map.
// Watches are sorted by typeURL.
func (w *watches) addWatch(typeURL string, watch *watch) {
w.responders[typeURL] = watch
}
// close all open watches
func (w *watches) close() {
for _, watch := range w.responders {
watch.close()
}
}
// recomputeWatches rebuilds the known list of dynamic channels if needed
func (w *watches) recompute(ctx context.Context, req <-chan *discovery.DiscoveryRequest) {
w.cases = w.cases[:0] // Clear the existing cases while retaining capacity.
w.cases = append(w.cases,
reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(ctx.Done()),
}, reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(req),
},
)
for _, watch := range w.responders {
w.cases = append(w.cases, reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(watch.response),
})
}
}
// watch contains the necessary modifiables for receiving resource responses
type watch struct {
cancel func()
nonce string
response chan cache.Response
}
// close cancels an open watch
func (w *watch) close() {
if w.cancel != nil {
w.cancel()
}
}
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