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examples: fix AddToCirculation method of TokenSale

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Closes #1379

We should check owner witness before adding more tokens to circulation.
Also we shouldn't allow to add to circulation more than TokenSupply
tokens.
This commit is contained in:
Anna Shaleva 2020-08-31 19:08:32 +03:00
parent 7560aa345a
commit 4fdcefc87c
1 changed files with 27 additions and 2 deletions
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29
examples/token-sale/token_sale.go
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@ -92,10 +92,16 @@ func InCirculation() int {
return getIntFromDB(ctx, token.CirculationKey)
}
// AddToCirculation sets the given amount as "in circulation" in the storage.
func AddToCirculation(amount int) bool {
// addToCirculation sets the given amount as "in circulation" in the storage.
func addToCirculation(amount int) bool {
if amount < 0 {
return false
}
supply := getIntFromDB(ctx, token.CirculationKey)
supply += amount
if supply > token.TotalSupply {
return false
}
storage.Put(ctx, token.CirculationKey, supply)
return true
}
@ -257,3 +263,22 @@ func Allowance(from, to []byte) interface{} {
key := append(from, to...)
return getIntFromDB(ctx, key)
}
// Mint initial supply of tokens
func Mint(to []byte) bool {
if trigger != runtime.Application {
return false
}
if !checkOwnerWitness() {
return false
}
minted := storage.Get(ctx, []byte("minted"))
if minted != nil && minted.(bool) == true {
return false
}
storage.Put(ctx, to, token.TotalSupply)
storage.Put(ctx, []byte("minted"), true)
addToCirculation(token.TotalSupply)
return true
}