P2P Resource Discovery for the Browser
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This document provides an overview of decentralized architectures and peer-to-peer (P2P) networks. It discusses early unstructured P2P networks like Gnutella 0.4 and introduces structured networks like Chord. Chord uses a distributed hash table and each node is responsible for a segment of data. The document also presents webrtc-explorer, a P2P overlay network designed for the web platform that uses Chord routing over WebRTC. Finally, it lists several related papers on topics like P2P resource discovery, distributed hash tables, and applications of P2P computing.
P2P Resource Discovery for the Browser
- 2. HI, I’M DAVID ://daviddias.me ://blog.daviddias.me ://github.com/diasdavid ://twitter.com/daviddias
- 7. RESOURCE DISCOVERY FOR THE WEB PLATFORM ON TOP OF A P2P OVERLAY NETWORK USING WEBRTC AS THE LAYER OF TRANSPORT
- 9. URL
- 21. P2P networks are only as useful as their Resource Discovery capabilities remain efficient when they scale up
- 22. P2P Overlay Networks primary focus is not to find a peer, it is to find a resource. Peers are ephemeral, resources should be permanent and discoverable.
- 23. GNUTELA 0.4
- 25. • march 2000, Justin Frankel and Tom Pepper • topology is completely random • routing and search using flooding with TTL and hop counter • really slow • lot’s of signalling traffic
- 31. GNUTELA 0.6
- 33. UNSTRUCTURED P2P NETWORKS Without an implicit way to organize content
- 35. CHORD
- 36. • DHT • Highly scalable • Each node only knows of m number of other nodes • Each node has a unique identifier • Each node is responsible for a segment of the data • Ids are 160 bits (SHA-1 for Uniform Distribution) • CHORD is awesome
- 39. 0 1 2 3 4 5 6 7 • 3 bit namespace • Id = hash(IP)
- 40. 0 1 2 3 4 5 6 7 • each node is responsible for a segment
- 41. 0 1 2 3 4 5 6 7 • minimum requirement - each node has to know their successor
- 42. 0 1 2 3 4 5 6 7 • each node is going to have it’s finger table
- 43. start interval sucessor start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = start(k) = start(k+1) sucessor - first node after start(k) n - ID of the peer m - number of bits used k - row number
- 44. 0 1 2 3 4 5 6 7 start interval sucessor start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k)
- 45. 0 1 2 3 4 5 6 7 start interval sucessor 1 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k) interval(k) = [(0+2*1-1) mod 23 , (0+2*2-1) mod 23) = [1,2)
- 46. 0 1 2 3 4 5 6 7 start interval sucessor 1 [1,2) 1 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k) interval(k) = [(0+2*1-1) mod 23 , (0+2*2-1) mod 23) =
- 47. 0 1 2 3 4 5 6 7 start interval sucessor 1 [1,2) 1 2 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k) interval(k) = [(0+2*2-1) mod 23 , (0+2*3-1) mod 23)
- 48. 0 1 2 3 4 5 6 7 start interval sucessor 1 [1,2) 1 2 [2,4) 3 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k) interval(k) = [(0+2*2-1) mod 23 , (0+2*3-1) mod 23)
- 49. 0 1 2 3 4 5 6 7 start interval sucessor 1 [1,2) 1 2 [2,4) 3 4 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k) interval(k) = [(0+2*3-1) mod 23 , (0+2*4-1) mod 23)
- 50. 0 1 2 3 4 5 6 7 start interval sucessor 1 [1,2) 1 2 [2,4) 3 4 [4,0) 6 start(k) = (n+2k-1) mod 2m, 1 ≤ k ≤ m interval(k) = [start(k), start(k+1) ) sucessor - first node after start(k)
- 52. WEBRTC-EXPLORER
- 53. • Chord inspired P2P overlay network designed for the Web Platform • Uses CHORD routing scheme • Uses WebRTC for transport • WebSockets for Signalling • Peers (browsers) route messages amongst them • 48 bits Ids • Brings a full DHT to the browser WEBRTC-EXPLORER
- 55. HOW DOES IT WORK
- 56. var Explorer = require(‘webrtc-explorer’); var config = { signalingURL: '<url>' }; var peer = new Explorer(config); peer.events.on(‘registered', function(data) { console.log('Id:', data.peerId); }); peer.events.on('ready', function() { console.log('ready to send messages'); }); peer.events.on('message', function(envelope) { console.log(envelope); }); peer.register(); //peer.send(‘<dst_id>’, <data_to_send>); s-register c-registered { id: “<this_peer_id>” }
- 59. DEMO
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- 65. THANK YOU! :D