Genkidama is a P2P content distribution system built using Java and DHT techniques. It uses NicoCache for storage and OpenChord for the DHT overlay. It supports 300 concurrent users and was developed by Daiki for uses including P2P SIP and livedoor. It provides a web dashboard and integrates various technologies like NAT traversal, XMLRPC, and a GUI.

1. Genkidama:

2. •
→
• BSD
• OpenBSD/sgi SMP
•

3. Genkidama
• NicoCache Java
→DHT
• NicoCache OpenChord
300
• →
• daiki P2P SIP
• livedoor
• OpenChord OverlayWeaver
• ↑ P2P SIP ←

5. NicoCache
•
• →
• →

6. Genkidama
• →DHT
DHT

7. DHT
•
get
• put
• : prefix + ID nc:sm1152439
• :
→
put

8. URL
• HTTP
Genkidama
• HTTP URL
http://124.32.128.131:50001/nc/sm11152439
• HTTP NicoCache
URL

9. •
•
•
• DHT
→

10. XMLRPC
• IP:port
→XMLRPC DB
• onlineUsers.fetch()
• DHT onlineUsers.register()
• cron

11. • XMLRPC DB
•
•
•
•
•

12. Web
• Genkidama Web Dashboard(http://genkidama.us/)
•
• Genkidama
•
•
•
• IP
DB IP

13. GUI
• AWT GUI
• Dashboard GUI
• JavaScript Genkidama HTTP JSON
→JS http://localhost:50001/ URL Genkidama
• HTTP
→ URL http://localhost:50001/ OK
http://genkidama.us/local/ URL
•

14. • Genkidama
• Genkidama HTTP proxy.pac
•
• firefox extention

15. Genkidama get/put
DHT
get/put Web

17. NAT
InetAddress.getLocalHost()
• hostname 127.0.0.1 InetAddress.getLocalHost()
127.0.0.1
• OverlayWeaver IP bind
InetAddress.getLocalHost() IP bind →127.0.0.1 bind
• IP InetAddress.getLocalHost()
IP DHT
• (><;;
• Java NIC IP API
• ANY bind OverlayWeaver

18. NAT
UPnP
•
• OverlayWeaver urn:schemas-upnp-org:service:WANIPConnection:1
urn:schemas-upnp-org:service:WANPPPConnection:1
• OverlayWeaver
UPnP CyberLink
• UPnPLib CyberLink
UPnPLib
• Azureus UPnP GPL
libupnp C →
• …

19. NAT
• UPnP
→UPnP
• XMLRPC
→globalIp.probe() XMLRPC IP
• IP OverlayWeaver

20. NAT
• UPnP
• HTTP UDP Hole Punching
• XMLRPC
TCP
→tcpPort.check() bind
• UDP

21. Genkidama DHT
• DHT URL
•
• remove
→
remove
• OverlayWeaver expire re-
put
→ remove

22. • Genkidama
join (´ ω `)
• OverlayWeaver
• OverlayWeaver
overlayweaver-ja
•
• MessagingTransport TCP
• ConnectionPool
close
• YO!

23. put
• DHT
put
• put
•
(´ ω `)
• ThreadExecutor put