PoC reactor pattern

ethutil/common_test.go

 package ethutil
 
 import (
-	"fmt"
 	"math/big"
 	"testing"
 )
 
 func TestCommon(t *testing.T) {
-	fmt.Println(CurrencyToString(BigPow(10, 19)))
-	fmt.Println(CurrencyToString(BigPow(10, 16)))
-	fmt.Println(CurrencyToString(BigPow(10, 13)))
-	fmt.Println(CurrencyToString(BigPow(10, 10)))
-	fmt.Println(CurrencyToString(BigPow(10, 7)))
-	fmt.Println(CurrencyToString(BigPow(10, 4)))
-	fmt.Println(CurrencyToString(big.NewInt(10)))
+	ether := CurrencyToString(BigPow(10, 19))
+	finney := CurrencyToString(BigPow(10, 16))
+	szabo := CurrencyToString(BigPow(10, 13))
+	vito := CurrencyToString(BigPow(10, 10))
+	turing := CurrencyToString(BigPow(10, 7))
+	eins := CurrencyToString(BigPow(10, 4))
+	wei := CurrencyToString(big.NewInt(10))
+
+	if ether != "10 Ether" {
+		t.Error("Got", ether)
+	}
+
+	if finney != "10 Finney" {
+		t.Error("Got", finney)
+	}
+
+	if szabo != "10 Szabo" {
+		t.Error("Got", szabo)
+	}
+
+	if vito != "10 Vito" {
+		t.Error("Got", vito)
+	}
+
+	if turing != "10 Turing" {
+		t.Error("Got", turing)
+	}
+
+	if eins != "10 Eins" {
+		t.Error("Got", eins)
+	}
+
+	if wei != "10 Wei" {
+		t.Error("Got", wei)
+	}
 }

ethutil/reactor.go

@@ -13,6 +13,9 @@ type ReactorEvent struct {
 // Post the specified reactor resource on the channels
 // currently subscribed
 func (e *ReactorEvent) Post(react React) {
+	e.mut.Lock()
+	defer e.mut.Unlock()
+
 	for _, ch := range e.chans {
 		go func(ch chan React) {
 			ch <- react
@@ -22,11 +25,17 @@ func (e *ReactorEvent) Post(react React) {
 
 // Add a subscriber to this event
 func (e *ReactorEvent) Add(ch chan React) {
+	e.mut.Lock()
+	defer e.mut.Unlock()
+
 	e.chans = append(e.chans, ch)
 }
 
 // Remove a subscriber
 func (e *ReactorEvent) Remove(ch chan React) {
+	e.mut.Lock()
+	defer e.mut.Unlock()
+
 	for i, c := range e.chans {
 		if c == ch {
 			e.chans = append(e.chans[:i], e.chans[i+1:]...)