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package dht
import (
"errors"
"fmt"
"math/rand"
"net"
"strconv"
)
const transIDBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
func newTransactionID() string {
b := make([]byte, 2)
for i := range b {
b[i] = transIDBytes[rand.Int63()%int64(len(transIDBytes))]
}
return string(b)
}
// makeQuery returns a query-formed data.
func makeQuery(t, q string, a map[string]interface{}) map[string]interface{} {
return map[string]interface{}{
"t": t,
"y": "q",
"q": q,
"a": a,
}
}
// makeResponse returns a response-formed data.
func makeResponse(t string, r map[string]interface{}) map[string]interface{} {
return map[string]interface{}{
"t": t,
"y": "r",
"r": r,
}
}
func getStringKey(data map[string]interface{}, key string) (string, error) {
val, ok := data[key]
if !ok {
return "", fmt.Errorf("krpc: missing key %s", key)
}
out, ok := val.(string)
if !ok {
return "", fmt.Errorf("krpc: key type mismatch")
}
return out, nil
}
func getMapKey(data map[string]interface{}, key string) (map[string]interface{}, error) {
val, ok := data[key]
if !ok {
return nil, fmt.Errorf("krpc: missing key %s", key)
}
out, ok := val.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("krpc: key type mismatch")
}
return out, nil
}
func getListKey(data map[string]interface{}, key string) ([]interface{}, error) {
val, ok := data[key]
if !ok {
return nil, fmt.Errorf("krpc: missing key %s", key)
}
out, ok := val.([]interface{})
if !ok {
return nil, fmt.Errorf("krpc: key type mismatch")
}
return out, nil
}
// parseKeys parses keys. It just wraps parseKey.
func checkKeys(data map[string]interface{}, pairs [][]string) (err error) {
for _, args := range pairs {
key, t := args[0], args[1]
if err = checkKey(data, key, t); err != nil {
break
}
}
return err
}
// parseKey parses the key in dict data. `t` is type of the keyed value.
// It's one of "int", "string", "map", "list".
func checkKey(data map[string]interface{}, key string, t string) error {
val, ok := data[key]
if !ok {
return fmt.Errorf("krpc: missing key %s", key)
}
switch t {
case "string":
_, ok = val.(string)
case "int":
_, ok = val.(int)
case "map":
_, ok = val.(map[string]interface{})
case "list":
_, ok = val.([]interface{})
default:
return errors.New("krpc: invalid type")
}
if !ok {
return errors.New("krpc: key type mismatch")
}
return nil
}
// Swiped from nictuku
func decodeCompactNodeAddr(cni string) string {
if len(cni) == 6 {
return fmt.Sprintf("%d.%d.%d.%d:%d", cni[0], cni[1], cni[2], cni[3], (uint16(cni[4])<<8)|uint16(cni[5]))
} else if len(cni) == 18 {
b := []byte(cni[:16])
return fmt.Sprintf("[%s]:%d", net.IP.String(b), (uint16(cni[16])<<8)|uint16(cni[17]))
} else {
return ""
}
}
func encodeCompactNodeAddr(addr string) string {
var a []uint8
host, port, _ := net.SplitHostPort(addr)
ip := net.ParseIP(host)
if ip == nil {
return ""
}
aa, _ := strconv.ParseUint(port, 10, 16)
c := uint16(aa)
if ip2 := net.IP.To4(ip); ip2 != nil {
a = make([]byte, net.IPv4len+2, net.IPv4len+2)
copy(a, ip2[0:net.IPv4len]) // ignore bytes IPv6 bytes if it's IPv4.
a[4] = byte(c >> 8)
a[5] = byte(c)
} else {
a = make([]byte, net.IPv6len+2, net.IPv6len+2)
copy(a, ip)
a[16] = byte(c >> 8)
a[17] = byte(c)
}
return string(a)
}
func int2bytes(val int64) []byte {
data, j := make([]byte, 8), -1
for i := 0; i < 8; i++ {
shift := uint64((7 - i) * 8)
data[i] = byte((val & (0xff << shift)) >> shift)
if j == -1 && data[i] != 0 {
j = i
}
}
if j != -1 {
return data[j:]
}
return data[:1]
}
|
