// parseFilesize converts strings of form 10GB to a size in bytes. Fractional
// sizes are truncated at the byte size.
func parseFilesize(strSize string) (string, error) {
units := []struct {
suffix string
multiplier int64
}{
{"kb", 1e3},
{"mb", 1e6},
{"gb", 1e9},
{"tb", 1e12},
{"kib", 1 << 10},
{"mib", 1 << 20},
{"gib", 1 << 30},
{"tib", 1 << 40},
{"b", 1}, // must be after others else it'll match on them all
{"", 1}, // no suffix is still a valid suffix
}
strSize = strings.ToLower(strSize)
for _, unit := range units {
if strings.HasSuffix(strSize, unit.suffix) {
r, ok := new(big.Rat).SetString(strings.TrimSuffix(strSize, unit.suffix))
if !ok {
return "", errUnableToParseSize
}
r.Mul(r, new(big.Rat).SetInt(big.NewInt(unit.multiplier)))
if !r.IsInt() {
f, _ := r.Float64()
return fmt.Sprintf("%d", int64(f)), nil
}
return r.RatString(), nil
}
}
return "", errUnableToParseSize
}
func ratProb(mode int) func(*big.Rat) *big.Rat {
return func(x *big.Rat) *big.Rat {
lo := big.NewInt(0)
hi := new(big.Int).Set(big2p63)
n := 0
for lo.Cmp(hi) != 0 {
m := new(big.Int).Add(lo, hi)
m = m.Rsh(m, 1)
if n++; n > 100 {
fmt.Printf("??? %v %v %v\n", lo, hi, m)
break
}
v := new(big.Rat).SetFrac(m, big2p63)
f, _ := v.Float64()
v.SetFloat64(f)
if v.Cmp(x) < 0 {
lo.Add(m, bigOne)
} else {
hi.Set(m)
}
}
switch mode {
default: // case 0
return new(big.Rat).SetFrac(lo, big2p63)
case 1:
if lo.Cmp(big.NewInt(cutoff1)) <= 0 {
lo.Add(lo, big.NewInt(1<<63-cutoff1))
}
return new(big.Rat).SetFrac(lo, big2p63)
case 2:
return new(big.Rat).SetFrac(lo, big.NewInt(cutoff1))
}
}
}
// walletbalancecmd retrieves and displays information about the wallet.
func walletbalancecmd() {
status := new(api.WalletGET)
err := getAPI("/wallet", status)
if err != nil {
die("Could not get wallet status:", err)
}
encStatus := "Unencrypted"
if status.Encrypted {
encStatus = "Encrypted"
}
lockStatus := "Locked"
balance := "Unlock the wallet to view balance"
if status.Unlocked {
lockStatus = "Unlocked"
// Divide by 1e24 to get SC.
r := new(big.Rat).SetFrac(status.ConfirmedSiacoinBalance.Big(), new(big.Int).Exp(big.NewInt(10), big.NewInt(24), nil))
sc, _ := r.Float64()
unconfirmedBalance := status.ConfirmedSiacoinBalance.Add(status.UnconfirmedIncomingSiacoins).Sub(status.UnconfirmedOutgoingSiacoins)
unconfirmedDifference := new(big.Int).Sub(unconfirmedBalance.Big(), status.ConfirmedSiacoinBalance.Big())
r = new(big.Rat).SetFrac(unconfirmedDifference, new(big.Int).Exp(big.NewInt(10), big.NewInt(24), nil))
usc, _ := r.Float64()
balance = fmt.Sprintf(`Confirmed Balance: %.2f SC
Unconfirmed Delta: %+.2f SC
Exact: %v H
Siafunds: %v SF
Siafund Claims: %v H
`, sc, usc, status.ConfirmedSiacoinBalance, status.SiafundBalance, status.SiacoinClaimBalance)
}
fmt.Printf(`Wallet status:
%s, %s
%s
`, encStatus, lockStatus, balance)
}
// walletstatuscmd retrieves and displays information about the wallet
func walletstatuscmd() {
status := new(api.WalletGET)
err := getAPI("/wallet", status)
if err != nil {
fmt.Println("Could not get wallet status:", err)
return
}
encStatus := "Unencrypted"
if status.Encrypted {
encStatus = "Encrypted"
}
lockStatus := "Locked"
if status.Unlocked {
lockStatus = "Unlocked"
}
// divide by 1e24 to get SC
r := new(big.Rat).SetFrac(status.ConfirmedSiacoinBalance.Big(), new(big.Int).Exp(big.NewInt(10), big.NewInt(24), nil))
sc, _ := r.Float64()
unconfirmedBalance := status.ConfirmedSiacoinBalance.Add(status.UnconfirmedIncomingSiacoins)
unconfirmedBalance = unconfirmedBalance.Sub(status.UnconfirmedOutgoingSiacoins)
r = new(big.Rat).SetFrac(unconfirmedBalance.Big(), new(big.Int).Exp(big.NewInt(10), big.NewInt(24), nil))
usc, _ := r.Float64()
fmt.Printf(`Wallet status:
%s, %s
Confirmed Balance: %.2f SC
Unconfirmed Balance: %.2f SC
Exact: %v H
`, encStatus, lockStatus, sc, usc, status.ConfirmedSiacoinBalance)
}
func ratToFloat32(x *big.Rat) (float32, bool) {
// Before 1.4, there's no Rat.Float32.
// Emulate it, albeit at the cost of
// imprecision in corner cases.
x64, exact := x.Float64()
x32 := float32(x64)
if math.IsInf(float64(x32), 0) {
exact = false
}
return x32, exact
}
// Returns the parsed duration in nanoseconds, support 'u', 's', 'm',
// 'h', 'd', 'W', 'M', and 'Y' suffixes.
func ParseTimeDuration(value string) (int64, error) {
var constant time.Duration
prefixSize := 1
switch value[len(value)-1] {
case 'u':
constant = time.Microsecond
case 's':
constant = time.Second
case 'm':
constant = time.Minute
case 'h':
constant = time.Hour
case 'd':
constant = 24 * time.Hour
case 'w', 'W':
constant = Week
case 'M':
constant = Month
case 'y', 'Y':
constant = Year
default:
prefixSize = 0
}
if value[len(value)-2:] == "ms" {
constant = time.Millisecond
prefixSize = 2
}
t := big.Rat{}
timeString := value
if prefixSize > 0 {
timeString = value[:len(value)-prefixSize]
}
_, err := fmt.Sscan(timeString, &t)
if err != nil {
return 0, err
}
if prefixSize > 0 {
c := big.Rat{}
c.SetFrac64(int64(constant), 1)
t.Mul(&t, &c)
}
if t.IsInt() {
return t.Num().Int64(), nil
}
f, _ := t.Float64()
return int64(f), nil
}
func main() {
ln2, _ := new(big.Rat).SetString("0.6931471805599453094172")
h := big.NewRat(1, 2)
h.Quo(h, ln2)
var f big.Rat
var w big.Int
for i := int64(1); i <= 17; i++ {
h.Quo(h.Mul(h, f.SetInt64(i)), ln2)
w.Quo(h.Num(), h.Denom())
f.Sub(h, f.SetInt(&w))
y, _ := f.Float64()
d := fmt.Sprintf("%.3f", y)
fmt.Printf("n: %2d h: %18d%s Nearly integer: %t\n",
i, &w, d[1:], d[2] == '0' || d[2] == '9')
}
}
func walletstatuscmd() {
status := new(modules.WalletInfo)
err := getAPI("/wallet/status", status)
if err != nil {
fmt.Println("Could not get wallet status:", err)
return
}
// divide by 1e24 to get SC
r := new(big.Rat).SetFrac(status.Balance.Big(), new(big.Int).Exp(big.NewInt(10), big.NewInt(24), nil))
sc, _ := r.Float64()
fmt.Printf(`Wallet status:
Balance: %.2f SC
Exact: %v H
Addresses: %d
`, sc, status.Balance, status.NumAddresses)
}
func plotPath(f func(*big.Rat) *big.Rat, fminx, fminy, fmaxx, fmaxy *big.Rat, r fixed.Rectangle26_6) raster.Path {
px := r.Min.X
var path raster.Path
for ; px <= r.Max.X; px += 1 << 6 {
fx := new(big.Rat).Add(fminx, new(big.Rat).Mul(new(big.Rat).Sub(fmaxx, fminx), new(big.Rat).Quo(big.NewRat(int64(px-r.Min.X), 1<<6), big.NewRat(int64(r.Max.X-r.Min.X), 1<<6))))
fy := f(fx)
fdy := new(big.Rat).Mul(new(big.Rat).Sub(fy, fminy), new(big.Rat).Quo(big.NewRat(int64(r.Max.Y-r.Min.Y), 1), new(big.Rat).Sub(fmaxy, fminy)))
dy, _ := fdy.Float64()
py := r.Min.Y + fixed.Int26_6(dy+0.5)
if len(path) == 0 {
path.Start(fixed.Point26_6{px, py})
} else {
path.Add1(fixed.Point26_6{px, py})
}
}
return path
}
// Returns an approximate Birthday probability calculation
// based on the number of blocks given and the hash size.
//
// It uses the simplified calculation: p = k(k-1) / (2N)
//
// From http://preshing.com/20110504/hash-collision-probabilities/
func BirthdayProblem(blocks int) string {
k := big.NewInt(int64(blocks))
km1 := big.NewInt(int64(blocks - 1))
ksq := k.Mul(k, km1)
n := big.NewInt(0)
n = n.Exp(big.NewInt(2), big.NewInt(int64(HashSize)*8), nil)
twoN := n.Add(n, n)
var t, t2 big.Rat
var res *big.Rat
//
res = t.SetFrac(ksq, twoN)
f64, _ := res.Float64()
inv := t2.Inv(res).FloatString(0)
invs := fmt.Sprintf(" ~ 1/%s ~ %v", inv, f64)
return "Collision probability is" + invs
}
// returns number of Nanoseconds
func (t *milliSecsOf256th) MilliSecs(m Measure) uint {
r := new(big.Rat)
r.Mul(t.Rat, big.NewRat(int64(int(m)), 1))
f, _ := r.Float64()
// fmt.Printf("Nanoseconds: %0.2f\n", f*1000000)
return uint(f * 1000000)
/*
a := big.NewRat(64, 60)
b := big.NewRat(1, int64(uint(t)))
z := new(big.Rat)
z = z.Mul(a, b)
z = z.Mul(z, big.NewRat(int64(int(m)), 1))
f, _ := z.Float64()
fmt.Printf("ticksPerMinute: %0.2f", f*1000)
return uint(f * 1000)
*/
}
// Returns the parsed duration in nanoseconds, support 'u', 's', 'm',
// 'h', 'd' and 'w' suffixes.
func ParseTimeDuration(value string) (int64, error) {
var constant time.Duration
hasPrefix := true
switch value[len(value)-1] {
case 'u':
constant = time.Microsecond
case 's':
constant = time.Second
case 'm':
constant = time.Minute
case 'h':
constant = time.Hour
case 'd':
constant = 24 * time.Hour
case 'w':
constant = 7 * 24 * time.Hour
case 'y':
constant = 365 * 24 * time.Hour
default:
hasPrefix = false
}
t := big.Rat{}
timeString := value
if hasPrefix {
timeString = value[:len(value)-1]
}
_, err := fmt.Sscan(timeString, &t)
if err != nil {
return 0, err
}
if hasPrefix {
c := big.Rat{}
c.SetFrac64(int64(constant), 1)
t.Mul(&t, &c)
}
if t.IsInt() {
return t.Num().Int64(), nil
}
f, _ := t.Float64()
return int64(f), nil
}
// measure via string
//func m_(s string) Measure {
func m_(s string) float64 {
r := new(big.Rat)
_, ok := r.SetString(s)
if !ok {
panic("can't convert to measure")
}
x := new(big.Rat)
// d := big.NewRat(1, 256)
d := big.NewRat(256, 1)
x.Mul(r, d)
f, _ := x.Float64()
//return Measure(int(f))
return f
}
// bigRatToValue converts 'number' to an SQL value with SQL type: valueType.
// If valueType is integral it truncates 'number' to the integer part according to the
// semantics of the big.Rat.Int method.
func bigRatToValue(number *big.Rat, valueType querypb.Type) sqltypes.Value {
var numberAsBytes []byte
switch {
case sqltypes.IsIntegral(valueType):
// 'number.Num()' returns a reference to the numerator of 'number'.
// We copy it here to avoid changing 'number'.
truncatedNumber := new(big.Int).Set(number.Num())
truncatedNumber.Quo(truncatedNumber, number.Denom())
numberAsBytes = bigIntToSliceOfBytes(truncatedNumber)
case sqltypes.IsFloat(valueType):
// Truncate to the closest 'float'.
// There's not much we can do if there isn't an exact representation.
numberAsFloat64, _ := number.Float64()
numberAsBytes = strconv.AppendFloat([]byte{}, numberAsFloat64, 'f', -1, 64)
default:
panic(fmt.Sprintf("Unsupported type: %v", valueType))
}
result, err := sqltypes.ValueFromBytes(valueType, numberAsBytes)
if err != nil {
panic(fmt.Sprintf("sqltypes.ValueFromBytes failed with: %v", err))
}
return result
}
// PriceString returns a human reprensetation of a price with a currency
func PriceString(price *big.Rat, currency string) string {
floatVal, _ := price.Float64()
return fmt.Sprintf("%s %s", humanize.Ftoa(floatVal), currency)
}
func ratFloat(rat *big.Rat) float64 {
f, _ := rat.Float64()
return f
}
func RatToFloat(v *big.Rat) float64 {
f, _ := v.Float64()
return f
}