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big.go
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big.go
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package big
import (
"database/sql/driver"
"encoding/json"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common/hexutil"
bigmath "github.com/smartcontractkit/chainlink-common/pkg/utils/big_math"
"github.com/smartcontractkit/chainlink-common/pkg/utils/hex"
"github.com/smartcontractkit/chainlink-common/pkg/utils/bytes"
)
const base10 = 10
// BigFloat accepts both string and float JSON values.
type BigFloat big.Float
// MarshalJSON implements the json.Marshaler interface.
func (b BigFloat) MarshalJSON() ([]byte, error) {
var j = big.Float(b)
return json.Marshal(&j)
}
// UnmarshalJSON implements the json.Unmarshal interface.
func (b *BigFloat) UnmarshalJSON(buf []byte) error {
var n json.Number
if err := json.Unmarshal(buf, &n); err == nil {
f, _, err := new(big.Float).Parse(n.String(), 0)
if err != nil {
return err
}
*b = BigFloat(*f)
return nil
}
var bf big.Float
if err := json.Unmarshal(buf, &bf); err != nil {
return err
}
*b = BigFloat(bf)
return nil
}
// Value returns the big.Float value.
func (b *BigFloat) Value() *big.Float {
return (*big.Float)(b)
}
// Big stores large integers and can deserialize a variety of inputs.
type Big big.Int
// New constructs a Big from *big.Int.
func New(i *big.Int) *Big {
if i != nil {
var b big.Int
b.Set(i)
return (*Big)(&b)
}
return nil
}
// NewI constructs a Big from int64.
func NewI(i int64) *Big {
return New(big.NewInt(i))
}
// MarshalText marshals this instance to base 10 number as string.
func (b Big) MarshalText() ([]byte, error) {
return []byte((*big.Int)(&b).Text(base10)), nil
}
// MarshalJSON marshals this instance to base 10 number as string.
func (b Big) MarshalJSON() ([]byte, error) {
text, err := b.MarshalText()
if err != nil {
return nil, err
}
return json.Marshal(string(text))
}
// UnmarshalText implements encoding.TextUnmarshaler.
func (b *Big) UnmarshalText(input []byte) error {
input = bytes.TrimQuotes(input)
str := string(input)
if hex.HasPrefix(str) {
decoded, err := hexutil.DecodeBig(str)
if err != nil {
return err
}
*b = Big(*decoded)
return nil
}
_, ok := b.setString(str, 10)
if !ok {
return fmt.Errorf("unable to convert %s to Big", str)
}
return nil
}
func (b *Big) setString(s string, base int) (*Big, bool) {
w, ok := (*big.Int)(b).SetString(s, base)
return (*Big)(w), ok
}
// UnmarshalJSON implements encoding.JSONUnmarshaler.
func (b *Big) UnmarshalJSON(input []byte) error {
return b.UnmarshalText(input)
}
// Value returns this instance serialized for database storage.
func (b Big) Value() (driver.Value, error) {
return b.String(), nil
}
// Scan reads the database value and returns an instance.
func (b *Big) Scan(value interface{}) error {
switch v := value.(type) {
case string:
decoded, ok := b.setString(v, 10)
if !ok {
return fmt.Errorf("unable to set string %v of %T to base 10 big.Int for Big", value, value)
}
*b = *decoded
case []uint8:
// The SQL library returns numeric() types as []uint8 of the string representation
decoded, ok := b.setString(string(v), 10)
if !ok {
return fmt.Errorf("unable to set string %v of %T to base 10 big.Int for Big", value, value)
}
*b = *decoded
default:
return fmt.Errorf("unable to convert %v of %T to Big", value, value)
}
return nil
}
// ToInt converts b to a big.Int.
func (b *Big) ToInt() *big.Int {
return (*big.Int)(b)
}
// String returns the base 10 encoding of b.
func (b *Big) String() string {
return b.ToInt().String()
}
// Bytes returns the absolute value of b as a big-endian byte slice.
func (b *Big) Hex() string {
return hexutil.EncodeBig(b.ToInt())
}
// Bytes returns the
func (b *Big) Bytes() []byte {
return b.ToInt().Bytes()
}
// Cmp compares b and c as big.Ints.
func (b *Big) Cmp(c *Big) int {
return b.ToInt().Cmp(c.ToInt())
}
// Equal returns true if c is equal according to Cmp.
func (b *Big) Equal(c *Big) bool {
return b.Cmp(c) == 0
}
// Int64 casts b as an int64 type
func (b *Big) Int64() int64 {
return b.ToInt().Int64()
}
// Add returns the sum of b and c
func (b *Big) Add(c *Big) *Big {
return New(bigmath.Add(b.ToInt(), c.ToInt()))
}
// Sub returns the differencs between b and c
func (b *Big) Sub(c *Big) *Big {
return New(bigmath.Sub(b.ToInt(), c.ToInt()))
}
// Sub returns b % c
func (b *Big) Mod(c *Big) *Big {
return New(bigmath.Mod(b.ToInt(), c.ToInt()))
}