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fix(evm): reject tx whenever a decimals conversion produces non-zero …
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,30 +1,55 @@ | ||
| package util | ||
|
|
||
| import "math/big" | ||
| import ( | ||
| "math/big" | ||
| ) | ||
|
|
||
| const ethereumDecimals = uint32(18) | ||
|
|
||
| func adaptDecimals(value *big.Int, fromDecimals, toDecimals uint32) *big.Int { | ||
| v := new(big.Int).Set(value) // clone value | ||
| func adaptDecimals(value *big.Int, fromDecimals, toDecimals uint32) (result *big.Int, remainder *big.Int) { | ||
| result = new(big.Int) | ||
| remainder = new(big.Int) | ||
| exp := big.NewInt(10) | ||
| if toDecimals > fromDecimals { | ||
| exp.Exp(exp, big.NewInt(int64(toDecimals-fromDecimals)), nil) | ||
| return v.Mul(v, exp) | ||
| result.Mul(value, exp) | ||
| } else { | ||
| exp.Exp(exp, big.NewInt(int64(fromDecimals-toDecimals)), nil) | ||
| result.DivMod(value, exp, remainder) | ||
| } | ||
| exp.Exp(exp, big.NewInt(int64(fromDecimals-toDecimals)), nil) | ||
| return v.Div(v, exp) | ||
| return | ||
| } | ||
|
|
||
| // wei => base tokens | ||
| func EthereumDecimalsToBaseTokenDecimals(value *big.Int, baseTokenDecimals uint32) uint64 { | ||
| v := adaptDecimals(value, ethereumDecimals, baseTokenDecimals) | ||
| if !v.IsUint64() { | ||
| func EthereumDecimalsToBaseTokenDecimals(value *big.Int, baseTokenDecimals uint32) (result uint64, remainder *big.Int) { | ||
| r, m := adaptDecimals(value, ethereumDecimals, baseTokenDecimals) | ||
| if !r.IsUint64() { | ||
| panic("cannot convert ether value to base tokens: too large") | ||
| } | ||
| return v.Uint64() | ||
| return r.Uint64(), m | ||
| } | ||
|
|
||
| func MustEthereumDecimalsToBaseTokenDecimalsExact(value *big.Int, baseTokenDecimals uint32) (result uint64) { | ||
| r, m := EthereumDecimalsToBaseTokenDecimals(value, baseTokenDecimals) | ||
| if m.Sign() != 0 { | ||
| panic("cannot convert ether value to base tokens: non-exact conversion") | ||
| } | ||
| return r | ||
| } | ||
|
|
||
| // base tokens => wei | ||
| func BaseTokensDecimalsToEthereumDecimals(value uint64, baseTokenDecimals uint32) *big.Int { | ||
| return adaptDecimals(new(big.Int).SetUint64(value), baseTokenDecimals, ethereumDecimals) | ||
| func BaseTokensDecimalsToEthereumDecimals(value uint64, baseTokenDecimals uint32) (result *big.Int, remainder uint64) { | ||
| r, m := adaptDecimals(new(big.Int).SetUint64(value), baseTokenDecimals, ethereumDecimals) | ||
| if !m.IsUint64() { | ||
| panic("cannot convert ether value to base tokens: too large") | ||
| } | ||
| return r, m.Uint64() | ||
| } | ||
|
|
||
| func MustBaseTokensDecimalsToEthereumDecimalsExact(value uint64, baseTokenDecimals uint32) (result *big.Int) { | ||
| r, m := BaseTokensDecimalsToEthereumDecimals(value, baseTokenDecimals) | ||
| if m != 0 { | ||
| panic("cannot convert base tokens value to ether: non-exact conversion") | ||
| } | ||
| return r | ||
| } |
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