[#365] settlement/basic: Implement asset distribution

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/innerring/processors/settlement/basic/util.go

@@ -0,0 +1,44 @@
+package basic
+
+import (
+	"math/big"
+)
+
+// NodeSizeTable is not thread safe, make sure it is accessed with external
+// locks or in single routine.
+type NodeSizeTable struct {
+	prices map[string]uint64
+	total  uint64
+}
+
+func (t *NodeSizeTable) Put(id []byte, avg uint64) {
+	t.prices[string(id)] += avg
+	t.total += avg
+}
+
+func (t *NodeSizeTable) Total() *big.Int {
+	return new(big.Int).SetUint64(t.total)
+}
+
+func (t *NodeSizeTable) Iterate(f func([]byte, *big.Int)) {
+	for k, v := range t.prices {
+		n := new(big.Int).SetUint64(v)
+		f([]byte(k), n)
+	}
+}
+
+func NewNodeSizeTable() *NodeSizeTable {
+	return &NodeSizeTable{
+		prices: make(map[string]uint64),
+	}
+}
+
+type nodeInfoWrapper []byte
+
+func (nodeInfoWrapper) Price() *big.Int {
+	panic("should not be used")
+}
+
+func (n nodeInfoWrapper) PublicKey() []byte {
+	return n
+}