/
apply-config-set.go
123 lines (109 loc) · 2.56 KB
/
apply-config-set.go
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package configset_controller
import (
"context"
"sync"
"github.com/aperturerobotics/controllerbus/controller/configset"
"github.com/aperturerobotics/controllerbus/directive"
)
// applyConfigSetResolver is an ApplyConfigSet resolver.
type applyConfigSetResolver struct {
// c is the controller
c *Controller
// ctx is the directive context
ctx context.Context
// di is the directive instance
di directive.Instance
// dir is the directive
dir configset.ApplyConfigSet
// refsMtx guards refs
refsMtx sync.Mutex
// refs are the references
refs map[configset.Reference]uint32
}
func newApplyConfigSetResolver(
c *Controller,
ctx context.Context,
di directive.Instance,
dir configset.ApplyConfigSet,
) *applyConfigSetResolver {
r := &applyConfigSetResolver{
c: c,
ctx: ctx,
di: di,
dir: dir,
refs: make(map[configset.Reference]uint32),
}
go r.waitCleanupRefs(ctx)
return r
}
// Resolve resolves the values, emitting them to the handler.
// Expect ApplyConfigSet to not have a value limit.
func (r *applyConfigSetResolver) Resolve(
ctx context.Context,
handler directive.ResolverHandler,
) error {
confSet := r.dir.GetApplyConfigSet()
if confSet == nil {
return nil
}
// Catalog existing references
existingRefs := make(map[string]directive.Reference)
r.refsMtx.Lock()
for ref := range r.refs {
existingRefs[ref.GetConfigKey()] = ref
}
r.refsMtx.Unlock()
// For each key/value controller config...
for k, v := range confSet {
if k == "" {
continue
}
if _, ok := existingRefs[k]; ok {
continue
}
ref, err := r.c.PushControllerConfig(ctx, k, v)
if err != nil {
if err == context.Canceled {
return err
}
r.c.le.WithError(err).Warn("unable to push controller config")
continue
}
// Add reference to running instance
r.refsMtx.Lock()
r.refs[ref] = 0
r.refsMtx.Unlock()
ref.AddStateCallback(func(st configset.State) {
r.refsMtx.Lock()
v, vOk := r.refs[ref]
if !vOk {
r.refsMtx.Unlock()
return
}
if v != 0 {
handler.RemoveValue(v)
}
var val configset.ApplyConfigSetValue = st
id, accepted := handler.AddValue(val)
if accepted {
r.refs[ref] = id
} else {
r.refs[ref] = 0
}
r.refsMtx.Unlock()
})
}
return nil
}
// waitCleanupRefs waits for the context to complete, then release refs
func (r *applyConfigSetResolver) waitCleanupRefs(ctx context.Context) {
<-ctx.Done()
r.refsMtx.Lock()
for ref := range r.refs {
ref.Release()
delete(r.refs, ref)
}
r.refsMtx.Unlock()
}
// _ is a type assertion
var _ directive.Resolver = ((*applyConfigSetResolver)(nil))