ir: Protect Fixed8Converter with sync.Mutex

It will allow real time updating.

Signed-off-by: Pavel Karpy <[email protected]>

pkg/util/precision/converter.go

@@ -3,6 +3,7 @@ package precision
 import (
 	"math"
 	"math/big"
+	"sync"
 )
 
 type (
@@ -21,6 +22,7 @@ type (
 	// This is a JSON bound that uses neo node. Neo-go has int64 limit for
 	// `smartcontract.Parameter` of integer type.
 	Fixed8Converter struct {
+		m *sync.RWMutex
 		converter
 	}
 )
@@ -56,11 +58,17 @@ func (c converter) toBase(n *big.Int) *big.Int {
 
 // ToFixed8 converts n of balance contract precision to Fixed8 precision.
 func (c Fixed8Converter) ToFixed8(n int64) int64 {
+	c.m.RLock()
+	defer c.m.RUnlock()
+
 	return c.toBase(new(big.Int).SetInt64(n)).Int64()
 }
 
 // ToBalancePrecision converts n of Fixed8 precision to balance contract precision.
 func (c Fixed8Converter) ToBalancePrecision(n int64) int64 {
+	c.m.RLock()
+	defer c.m.RUnlock()
+
 	return c.toTarget(new(big.Int).SetInt64(n)).Int64()
 }
 
@@ -71,6 +79,9 @@ func (c *Fixed8Converter) SetBalancePrecision(precision uint32) {
 		exp = -exp
 	}
 
+	c.m.Lock()
+	defer c.m.Unlock()
+
 	c.base = fixed8Precision
 	c.target = precision
 	c.factor = new(big.Int).SetInt64(int64(math.Pow10(exp)))