common/prque: generic priority queue (#26290)

* common, core, eth, les, trie: make prque generic

* les/vflux/server: fixed issues in priorityPool

* common, core, eth, les, trie: make priority also generic in prque

* les/flowcontrol: add test case for priority accumulator overflow

* les/flowcontrol: avoid priority value overflow

* common/prque: use int priority in some tests

No need to convert to int64 when we can just change the type used by the
queue.

* common/prque: remove comment about int64 range

---------

Co-authored-by: Zsolt Felfoldi <zsfelfoldi@gmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>

common/prque/sstack_test.go

@@ -17,23 +17,23 @@ import (
 func TestSstack(t *testing.T) {
 	// Create some initial data
 	size := 16 * blockSize
-	data := make([]*item, size)
+	data := make([]*item[int64, int], size)
 	for i := 0; i < size; i++ {
-		data[i] = &item{rand.Int(), rand.Int63()}
+		data[i] = &item[int64, int]{rand.Int(), rand.Int63()}
 	}
-	stack := newSstack(nil, false)
+	stack := newSstack[int64, int](nil)
 	for rep := 0; rep < 2; rep++ {
 		// Push all the data into the stack, pop out every second
-		secs := []*item{}
+		secs := []*item[int64, int]{}
 		for i := 0; i < size; i++ {
 			stack.Push(data[i])
 			if i%2 == 0 {
-				secs = append(secs, stack.Pop().(*item))
+				secs = append(secs, stack.Pop().(*item[int64, int]))
 			}
 		}
-		rest := []*item{}
+		rest := []*item[int64, int]{}
 		for stack.Len() > 0 {
-			rest = append(rest, stack.Pop().(*item))
+			rest = append(rest, stack.Pop().(*item[int64, int]))
 		}
 		// Make sure the contents of the resulting slices are ok
 		for i := 0; i < size; i++ {
@@ -50,12 +50,12 @@ func TestSstack(t *testing.T) {
 func TestSstackSort(t *testing.T) {
 	// Create some initial data
 	size := 16 * blockSize
-	data := make([]*item, size)
+	data := make([]*item[int64, int], size)
 	for i := 0; i < size; i++ {
-		data[i] = &item{rand.Int(), int64(i)}
+		data[i] = &item[int64, int]{rand.Int(), int64(i)}
 	}
 	// Push all the data into the stack
-	stack := newSstack(nil, false)
+	stack := newSstack[int64, int](nil)
 	for _, val := range data {
 		stack.Push(val)
 	}
@@ -72,18 +72,18 @@ func TestSstackSort(t *testing.T) {
 func TestSstackReset(t *testing.T) {
 	// Create some initial data
 	size := 16 * blockSize
-	data := make([]*item, size)
+	data := make([]*item[int64, int], size)
 	for i := 0; i < size; i++ {
-		data[i] = &item{rand.Int(), rand.Int63()}
+		data[i] = &item[int64, int]{rand.Int(), rand.Int63()}
 	}
-	stack := newSstack(nil, false)
+	stack := newSstack[int64, int](nil)
 	for rep := 0; rep < 2; rep++ {
 		// Push all the data into the stack, pop out every second
-		secs := []*item{}
+		secs := []*item[int64, int]{}
 		for i := 0; i < size; i++ {
 			stack.Push(data[i])
 			if i%2 == 0 {
-				secs = append(secs, stack.Pop().(*item))
+				secs = append(secs, stack.Pop().(*item[int64, int]))
 			}
 		}
 		// Reset and verify both pulled and stack contents