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service_alias.go
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196 lines (163 loc) · 4.8 KB
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package do
import (
"context"
"fmt"
"reflect"
"sync"
"sync/atomic"
"github.com/samber/do/v2/stacktrace"
)
var _ Service[int] = (*serviceAlias[int, int])(nil)
var _ serviceHealthcheck = (*serviceAlias[int, int])(nil)
var _ serviceShutdown = (*serviceAlias[int, int])(nil)
var _ serviceClone = (*serviceAlias[int, int])(nil)
type serviceAlias[Initial any, Alias any] struct {
mu sync.RWMutex
name string
typeName string
scope Injector
targetName string
providerFrame stacktrace.Frame
invokationFrames map[stacktrace.Frame]struct{} // map garanties uniqueness
invokationFramesCounter uint32
}
func newServiceAlias[Initial any, Alias any](name string, scope Injector, targetName string) *serviceAlias[Initial, Alias] {
providerFrame, _ := stacktrace.NewFrameFromCaller()
return &serviceAlias[Initial, Alias]{
mu: sync.RWMutex{},
name: name,
typeName: inferServiceName[Alias](),
scope: scope,
targetName: targetName,
providerFrame: providerFrame,
invokationFrames: map[stacktrace.Frame]struct{}{},
invokationFramesCounter: 0,
}
}
func (s *serviceAlias[Initial, Alias]) getName() string {
return s.name
}
func (s *serviceAlias[Initial, Alias]) getTypeName() string {
return s.typeName
}
func (s *serviceAlias[Initial, Alias]) getServiceType() ServiceType {
return ServiceTypeAlias
}
func (s *serviceAlias[Initial, Alias]) implements(reflect.Type) bool { return false }
func (s *serviceAlias[Initial, Alias]) getEmptyInstance() any {
return empty[Alias]()
}
func (s *serviceAlias[Initial, Alias]) getInstanceAny(i Injector) (any, error) {
return s.getInstance(i)
}
func (s *serviceAlias[Initial, Alias]) getInstance(i Injector) (Alias, error) {
// Collect up to 100 invokation frames.
// In the future, we can implement a LFU list, to evict the oldest
// frames and keep the most recent ones, but it would be much more costly.
if atomic.AddUint32(&s.invokationFramesCounter, 1) < MaxInvokationFrames {
frame, ok := stacktrace.NewFrameFromCaller()
if ok {
s.mu.Lock()
s.invokationFrames[frame] = struct{}{}
s.mu.Unlock()
}
}
instance, err := invokeByName[Initial](s.scope, s.targetName)
if err != nil {
return empty[Alias](), err
}
switch target := any(instance).(type) {
case Alias:
return target, nil
default:
// should never happen, since invoke() checks the type
return empty[Alias](), serviceTypeMismatch(inferServiceName[Alias](), inferServiceName[Initial]())
// return empty[Alias](), fmt.Errorf("DI: could not cast `%s` as `%s`", s.targetName, s.name)
}
}
func (s *serviceAlias[Initial, Alias]) isHealthchecker() bool {
serviceAny, _, ok := s.scope.serviceGetRec(s.targetName)
if !ok {
return false
}
service, ok := serviceAny.(Service[Initial])
if !ok {
return false
}
switch service.getEmptyInstance().(type) {
case Alias:
return service.isHealthchecker()
default:
return false
}
}
func (s *serviceAlias[Initial, Alias]) healthcheck(ctx context.Context) error {
serviceAny, _, ok := s.scope.serviceGetRec(s.targetName)
if !ok {
return nil
}
service, ok := serviceAny.(Service[Initial])
if !ok {
return nil
}
switch service.getEmptyInstance().(type) {
case Alias:
return service.healthcheck(ctx)
default:
return fmt.Errorf("DI: could not cast `%s` as `%s`", s.targetName, s.name)
}
}
func (s *serviceAlias[Initial, Alias]) isShutdowner() bool {
serviceAny, _, ok := s.scope.serviceGetRec(s.targetName)
if !ok {
return false
}
service, ok := serviceAny.(Service[Initial])
if !ok {
return false
}
switch service.getEmptyInstance().(type) {
case Alias:
return service.isShutdowner()
default:
return false
}
}
func (s *serviceAlias[Initial, Alias]) shutdown(ctx context.Context) error {
serviceAny, _, ok := s.scope.serviceGetRec(s.targetName)
if !ok {
return nil
}
service, ok := serviceAny.(Service[Initial])
if !ok {
return nil
}
switch service.getEmptyInstance().(type) {
case Alias:
return service.shutdown(ctx)
default:
return fmt.Errorf("DI: could not cast `%s` as `%s`", s.targetName, s.name)
}
}
func (s *serviceAlias[Initial, Alias]) clone() any {
return &serviceAlias[Initial, Alias]{
mu: sync.RWMutex{},
name: s.name,
typeName: s.typeName,
// scope: s.scope, <-- @TODO: we should inject here the cloned scope
targetName: s.targetName,
providerFrame: s.providerFrame,
invokationFrames: map[stacktrace.Frame]struct{}{},
invokationFramesCounter: 0,
}
}
// nolint:unused
func (s *serviceAlias[Initial, Alias]) source() (stacktrace.Frame, []stacktrace.Frame) {
s.mu.RLock()
invokationFrames := make([]stacktrace.Frame, 0, len(s.invokationFrames))
for frame := range s.invokationFrames {
invokationFrames = append(invokationFrames, frame)
}
s.mu.RUnlock()
return s.providerFrame, invokationFrames
}