Initial dract of the common structs

common/token.go

@@ -0,0 +1,25 @@
+package common
+
+import (
+	"time"
+
+	eth "github.com/ethereum/go-ethereum/common"
+)
+
+// Token is a struct that represents an Etherum token that is supported in Hermez network
+type Token struct {
+	ID       TokenID
+	Addr     eth.Address
+	Symbol   string
+	Decimals uint64
+}
+
+// TokenInfo provides the price of the token in USD
+type TokenInfo struct {
+	TokenID     uint32
+	Value       float64
+	LastUpdated time.Time
+}
+
+// TokenID is the unique identifier of the token, as set in the smart contract
+type TokenID uint32 // current implementation supports up to 2^32 tokens