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package socketio
import (
// SessionID is just a string for now.
type SessionID string
const (
// Length of the session ids.
SessionIDLength = 16
// Charset from which to build the session ids.
SessionIDCharset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
// NewSessionID creates a new ~random session id that is SessionIDLength long and
// consists of random characters from the SessionIDCharset.
func NewSessionID() (sid SessionID, err os.Error) {
b := make([]byte, SessionIDLength)
if _, err = io.ReadFull(rand.Reader, b); err != nil {
for i := 0; i < SessionIDLength; i++ {
b[i] = SessionIDCharset[b[i]%uint8(len(SessionIDCharset))]
sid = SessionID(b)
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