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interceptorsContainer.go
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/
interceptorsContainer.go
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package containers
import (
"fmt"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/container"
"github.com/ElrondNetwork/elrond-go/process"
)
var _ process.InterceptorsContainer = (*interceptorsContainer)(nil)
// interceptorsContainer is an interceptors holder organized by type
type interceptorsContainer struct {
objects *container.MutexMap
}
// NewInterceptorsContainer will create a new instance of a container
func NewInterceptorsContainer() *interceptorsContainer {
return &interceptorsContainer{
objects: container.NewMutexMap(),
}
}
// Get returns the object stored at a certain key.
// Returns an error if the element does not exist
func (ic *interceptorsContainer) Get(key string) (process.Interceptor, error) {
value, ok := ic.objects.Get(key)
if !ok {
return nil, fmt.Errorf("%w in interceptors container for key %v", process.ErrInvalidContainerKey, key)
}
interceptor, ok := value.(process.Interceptor)
if !ok {
return nil, process.ErrWrongTypeInContainer
}
return interceptor, nil
}
// Add will add an object at a given key. Returns
// an error if the element already exists
func (ic *interceptorsContainer) Add(key string, interceptor process.Interceptor) error {
if check.IfNil(interceptor) {
return process.ErrNilContainerElement
}
ok := ic.objects.Insert(key, interceptor)
if !ok {
return process.ErrContainerKeyAlreadyExists
}
return nil
}
// AddMultiple will add objects with given keys. Returns
// an error if one element already exists, lengths mismatch or an interceptor is nil
func (ic *interceptorsContainer) AddMultiple(keys []string, interceptors []process.Interceptor) error {
if len(keys) != len(interceptors) {
return process.ErrLenMismatch
}
for idx, key := range keys {
if len(key) == 0 {
continue
}
err := ic.Add(key, interceptors[idx])
if err != nil {
return err
}
}
return nil
}
// Replace will add (or replace if it already exists) an object at a given key
func (ic *interceptorsContainer) Replace(key string, interceptor process.Interceptor) error {
if check.IfNil(interceptor) {
return process.ErrNilContainerElement
}
ic.objects.Set(key, interceptor)
return nil
}
// Remove will remove an object at a given key
func (ic *interceptorsContainer) Remove(key string) {
ic.objects.Remove(key)
}
// Len returns the length of the added objects
func (ic *interceptorsContainer) Len() int {
return ic.objects.Len()
}
// Iterate will call the provided handler for each and every key-value pair
func (ic *interceptorsContainer) Iterate(handler func(key string, interceptor process.Interceptor) bool) {
if handler == nil {
return
}
for _, keyVal := range ic.objects.Keys() {
key, ok := keyVal.(string)
if !ok {
continue
}
val, ok := ic.objects.Get(key)
if !ok {
continue
}
interceptor, ok := val.(process.Interceptor)
if !ok {
continue
}
shouldContinue := handler(key, interceptor)
if !shouldContinue {
return
}
}
}
// IsInterfaceNil returns true if there is no value under the interface
func (ic *interceptorsContainer) IsInterfaceNil() bool {
return ic == nil
}