[feature] Read + Write tombstones for deleted Actors (#1005)

* [feature] Read + Write tombstones for deleted Actors

* copyTombstone

* update to use resultcache instead of old ttl cache

Signed-off-by: kim <grufwub@gmail.com>

* update go-cache library to fix result cache capacity / ordering bugs

Signed-off-by: kim <grufwub@gmail.com>

* bump go-cache/v3 to v3.1.6 to fix bugs

Signed-off-by: kim <grufwub@gmail.com>

* switch on status code

* better explain ErrGone reasoning

Signed-off-by: kim <grufwub@gmail.com>
Co-authored-by: kim <grufwub@gmail.com>

vendor/codeberg.org/gruf/go-maps/ordered.go

@@ -0,0 +1,159 @@
+package maps
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// OrderedMap provides a hashmap implementation that tracks the order in which keys are added.
+type OrderedMap[K comparable, V any] struct {
+	ordered[K, V]
+}
+
+// NewOrdered returns a new instance of LRUMap with given initializing length and maximum capacity.
+func NewOrdered[K comparable, V any](len int) *OrderedMap[K, V] {
+	m := new(OrderedMap[K, V])
+	m.Init(len)
+	return m
+}
+
+// Init will initialize this map with initial length.
+func (m *OrderedMap[K, V]) Init(len int) {
+	if m.pool != nil {
+		panic("ordered map already initialized")
+	}
+	m.ordered.hmap = make(map[K]*elem[K, V], len)
+	m.ordered.pool = allocElems[K, V](len)
+}
+
+// Get will fetch value for given key from map. Returns false if not found.
+func (m *OrderedMap[K, V]) Get(key K) (V, bool) {
+	if elem, ok := m.hmap[key]; ok {
+		return elem.V, true
+	}
+	var z V // zero value
+	return z, false
+}
+
+// Add will add the given key-value pair to the map, returns false if already exists.
+func (m *OrderedMap[K, V]) Add(key K, value V) bool {
+	// Ensure safe
+	m.write_check()
+
+	// Look for existing elem
+	elem, ok := m.hmap[key]
+	if ok {
+		return false
+	}
+
+	// Allocate elem
+	elem = m.alloc()
+	elem.K = key
+	elem.V = value
+
+	// Add element map entry
+	m.hmap[key] = elem
+
+	// Push to back of list
+	m.list.PushBack(elem)
+	return true
+}
+
+// Set will ensure that given key-value pair exists in the map, by either adding new or updating existing.
+func (m *OrderedMap[K, V]) Set(key K, value V) {
+	// Ensure safe
+	m.write_check()
+
+	// Look for existing elem
+	elem, ok := m.hmap[key]
+
+	if ok {
+		// Update existing
+		elem.V = value
+	} else {
+		// Allocate elem
+		elem = m.alloc()
+		elem.K = key
+		elem.V = value
+
+		// Add element map entry
+		m.hmap[key] = elem
+
+		// Push to back of list
+		m.list.PushBack(elem)
+	}
+}
+
+// Index returns the key-value pair at index from map. Returns false if index out of range.
+func (m *OrderedMap[K, V]) Index(idx int) (K, V, bool) {
+	if idx < 0 || idx >= m.list.len {
+		var (
+			zk K
+			zv V
+		) // zero values
+		return zk, zv, false
+	}
+	elem := m.list.Index(idx)
+	return elem.K, elem.V, true
+}
+
+// Push will insert the given key-value pair at index in the map. Panics if index out of range.
+func (m *OrderedMap[K, V]) Push(idx int, key K, value V) {
+	// Check index within bounds of map
+	if idx < 0 || idx >= m.list.len {
+		panic("index out of bounds")
+	}
+
+	// Ensure safe
+	m.write_check()
+
+	// Get element at index
+	next := m.list.Index(idx)
+
+	// Allocate new elem
+	elem := m.alloc()
+	elem.K = key
+	elem.V = value
+
+	// Add element map entry
+	m.hmap[key] = elem
+
+	// Move next forward
+	elem.next = next
+	elem.prev = next.prev
+
+	// Link up elem in chain
+	next.prev.next = elem
+	next.prev = elem
+}
+
+// Pop will remove and return the key-value pair at index in the map. Panics if index out of range.
+func (m *OrderedMap[K, V]) Pop(idx int) (K, V) {
+	// Check index within bounds of map
+	if idx < 0 || idx >= m.list.len {
+		panic("index out of bounds")
+	}
+
+	// Ensure safe
+	m.write_check()
+
+	// Get element at index
+	elem := m.list.Index(idx)
+
+	// Unlink elem from list
+	m.list.Unlink(elem)
+
+	// Get elem values
+	k := elem.K
+	v := elem.V
+
+	// Release to pool
+	m.free(elem)
+
+	return k, v
+}
+
+// Format implements fmt.Formatter, allowing performant string formatting of map.
+func (m *OrderedMap[K, V]) Format(state fmt.State, verb rune) {
+	m.format(reflect.TypeOf(m), state, verb)
+}