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core: fix Storage.Get to return Null when there is no value

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Match C# implementation and fix state inconsistency at block 249920 of
preview2 testnet. Make our Go Storage.Get return nil and adapt
examples/tests.
This commit is contained in:
Roman Khimov 2020-06-24 00:06:42 +03:00
parent 954c8ff8d6
commit d81d826bfc
9 changed files with 67 additions and 30 deletions
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18
pkg/rpc/server/testdata/test_contract.go vendored
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@ -32,7 +32,11 @@ func Main(operation string, args []interface{}) interface{} {
runtime.Log("invalid address")
return false
}
amount := storage.Get(ctx, addr).(int)
var amount int
val := storage.Get(ctx, addr)
if val != nil {
amount = val.(int)
}
runtime.Notify("balanceOf", addr, amount)
return amount
case "transfer":
@ -53,7 +57,11 @@ func Main(operation string, args []interface{}) interface{} {
return false
}
fromBalance := storage.Get(ctx, from).(int)
var fromBalance int
val := storage.Get(ctx, from)
if val != nil {
fromBalance = val.(int)
}
if fromBalance < amount {
runtime.Log("insufficient funds")
return false
@ -61,7 +69,11 @@ func Main(operation string, args []interface{}) interface{} {
fromBalance -= amount
storage.Put(ctx, from, fromBalance)
toBalance := storage.Get(ctx, to).(int)
var toBalance int
val = storage.Get(ctx, to)
if val != nil {
toBalance = val.(int)
}
toBalance += amount
storage.Put(ctx, to, toBalance)