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package dhtsearch
import (
"errors"
"fmt"
"net"
)
// 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,
}
}
// parseKeys parses keys. It just wraps parseKey.
func parseKeys(data map[string]interface{}, pairs [][]string) error {
for _, args := range pairs {
key, t := args[0], args[1]
if err := parseKey(data, key, t); err != nil {
return err
}
}
return nil
}
// parseKey parses the key in dict data. `t` is type of the keyed value.
// It's one of "int", "string", "map", "list".
func parseKey(data map[string]interface{}, key string, t string) error {
val, ok := data[key]
if !ok {
return errors.New("lack of 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:
panic("invalid type")
}
if !ok {
return errors.New("invalid key type")
}
return nil
}
// parseMessage parses the basic data received from udp.
// It returns a map value.
func parseMessage(data interface{}) (map[string]interface{}, error) {
response, ok := data.(map[string]interface{})
if !ok {
return nil, errors.New("response is not dict")
}
if err := parseKeys(response, [][]string{{"t", "string"}, {"y", "string"}}); err != nil {
return nil, err
}
return response, nil
}
// Swiped from nictuku
func compactNodeInfoToString(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 ""
}
}
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