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package runtime
import (
"github.com/dexon-foundation/decimal"
"github.com/dexon-foundation/dexon/core/vm/sqlvm/ast"
"github.com/dexon-foundation/dexon/core/vm/sqlvm/common"
dec "github.com/dexon-foundation/dexon/core/vm/sqlvm/common/decimal"
se "github.com/dexon-foundation/dexon/core/vm/sqlvm/errors"
)
// function identifier
const (
BLOCKHASH = "BLOCK_HASH"
)
type fn func(*common.Context, []*Operand, uint64) (*Operand, error)
var (
fnTable = map[string]fn{
BLOCKHASH: fnBlockHash,
}
)
func assignFuncResult(meta []ast.DataType, fn func() *Raw, length uint64) (result *Operand) {
result = &Operand{Meta: meta, Data: make([]Tuple, length)}
for i := uint64(0); i < length; i++ {
result.Data[i] = Tuple{fn()}
}
return
}
func evalBlockHash(ctx *common.Context, num, cur decimal.Decimal) (r *Raw, err error) {
r = &Raw{Bytes: make([]byte, 32)}
cNum := cur.Sub(dec.Dec257)
if num.Cmp(cNum) > 0 && num.Cmp(cur) < 0 {
var num64 uint64
num64, err = ast.DecimalToUint64(num)
if err != nil {
return
}
r.Bytes = ctx.GetHash(num64).Bytes()
}
return
}
func fnBlockHash(ctx *common.Context, ops []*Operand, length uint64) (result *Operand, err error) {
if len(ops) != 1 {
err = se.ErrorCodeInvalidOperandNum
return
}
meta := []ast.DataType{ast.ComposeDataType(ast.DataTypeMajorFixedBytes, 3)}
cNum := decimal.NewFromBigInt(ctx.BlockNumber, 0)
if ops[0].IsImmediate {
var r *Raw
r, err = evalBlockHash(ctx, ops[0].Data[0][0].Value, cNum)
if err != nil {
return
}
result = assignFuncResult(meta, r.clone, length)
} else {
result = &Operand{Meta: meta, Data: make([]Tuple, length)}
for i := uint64(0); i < length; i++ {
var r *Raw
r, err = evalBlockHash(ctx, ops[0].Data[i][0].Value, cNum)
if err != nil {
return
}
result.Data[i] = Tuple{r}
}
}
return
}
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