feat: observe traffic and expose statistics (libp2p#243)

jacobheun · Feb 27, 2018 · a4521dd · a4521dd
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diff --git a/README.md b/README.md
@@ -29,6 +29,7 @@ libp2p-switch is used by [libp2p](https://github.com/libp2p/js-libp2p) but it ca
   - [`switch.start(callback)`](#swarmlistencallback)
   - [`switch.stop(callback)`](#swarmclosecallback)
   - [`switch.connection`](#connection)
+  - [`switch.stats`](#stats-api)
   - [Internal Transports API](#transports)
 - [Design Notes](#designnotes)
   - [Multitransport](#multitransport)
@@ -51,9 +52,26 @@ libp2p-switch is used by [libp2p](https://github.com/libp2p/js-libp2p) but it ca
 ```JavaScript
 const switch = require('libp2p-switch')
 
-const sw = new switch(peerInfo [, peerBook])
+const sw = new switch(peerInfo , peerBook [, options])
 ```
 
+If defined, `options` should be an object with the following keys and respective values:
+
+- `stats`: an object with the following keys and respective values:
+  - `maxOldPeersRetention`: maximum old peers retention. For when peers disconnect and keeping the stats around in case they reconnect. Defaults to `100`.
+  - `computeThrottleMaxQueueSize`: maximum queue size to perform stats computation throttling. Defaults to `1000`.
+  - `computeThrottleTimeout`: Throttle timeout, in miliseconds. Defaults to `2000`,
+  - `movingAverageIntervals`: Array containin the intervals, in miliseconds, for which moving averages are calculated. Defaults to:
+
+  ```js
+  [
+    60 * 1000, // 1 minute
+    5 * 60 * 1000, // 5 minutes
+    15 * 60 * 1000 // 15 minutes
+  ]
+  ```
+
+
 ## API
 
 - peerInfo is a [PeerInfo](https://github.com/libp2p/js-peer-info) object that has the peer information.
@@ -147,6 +165,111 @@ Enable circuit relaying.
         - active - is it an active or passive relay (default false)
 - `callback`
 
+### Stats API
+
+##### `switch.stats.emit('update')`
+
+Every time any stat value changes, this object emits an `update` event.
+
+#### Global stats
+
+##### `switch.stats.global.snapshot`
+
+Should return a stats snapshot, which is an object containing the following keys and respective values:
+
+- dataSent: amount of bytes sent, [Big](https://github.com/MikeMcl/big.js#readme) number
+- dataReceived: amount of bytes received, [Big](https://github.com/MikeMcl/big.js#readme) number
+
+##### `switch.stats.global.movingAverages`
+
+Returns an object containing the following keys:
+
+- dataSent
+- dataReceived
+
+Each one of them contains an object that has a key for each interval (`60000`, `300000` and `900000` miliseconds).
+
+Each one of these values is [an exponential moving-average instance](https://github.com/pgte/moving-average#readme).
+
+#### Per-transport stats
+
+##### `switch.stats.transports()`
+
+Returns an array containing the tags (string) for each observed transport.
+
+##### `switch.stats.forTransport(transportTag).snapshot`
+
+Should return a stats snapshot, which is an object containing the following keys and respective values:
+
+- dataSent: amount of bytes sent, [Big](https://github.com/MikeMcl/big.js#readme) number
+- dataReceived: amount of bytes received, [Big](https://github.com/MikeMcl/big.js#readme) number
+
+##### `switch.stats.forTransport(transportTag).movingAverages`
+
+Returns an object containing the following keys:
+
+ dataSent
+ dataReceived
+
+Each one of them contains an object that has a key for each interval (`60000`, `300000` and `900000` miliseconds).
+
+Each one of these values is [an exponential moving-average instance](https://github.com/pgte/moving-average#readme).
+
+#### Per-protocol stats
+
+##### `switch.stats.protocols()`
+
+Returns an array containing the tags (string) for each observed protocol.
+
+##### `switch.stats.forProtocol(protocolTag).snapshot`
+
+Should return a stats snapshot, which is an object containing the following keys and respective values:
+
+- dataSent: amount of bytes sent, [Big](https://github.com/MikeMcl/big.js#readme) number
+- dataReceived: amount of bytes received, [Big](https://github.com/MikeMcl/big.js#readme) number
+
+
+##### `switch.stats.forProtocol(protocolTag).movingAverages`
+
+Returns an object containing the following keys:
+
+- dataSent
+- dataReceived
+
+Each one of them contains an object that has a key for each interval (`60000`, `300000` and `900000` miliseconds).
+
+Each one of these values is [an exponential moving-average instance](https://github.com/pgte/moving-average#readme).
+
+#### Per-peer stats
+
+##### `switch.stats.peers()`
+
+Returns an array containing the peerIDs (B58-encoded string) for each observed peer.
+
+##### `switch.stats.forPeer(peerId:String).snapshot`
+
+Should return a stats snapshot, which is an object containing the following keys and respective values:
+
+- dataSent: amount of bytes sent, [Big](https://github.com/MikeMcl/big.js#readme) number
+- dataReceived: amount of bytes received, [Big](https://github.com/MikeMcl/big.js#readme) number
+
+
+##### `switch.stats.forPeer(peerId:String).movingAverages`
+
+Returns an object containing the following keys:
+
+- dataSent
+- dataReceived
+
+Each one of them contains an object that has a key for each interval (`60000`, `300000` and `900000` miliseconds).
+
+Each one of these values is [an exponential moving-average instance](https://github.com/pgte/moving-average#readme).
+
+#### Stats update interval
+
+Stats are not updated in real-time. Instead, measurements are buffered and stats are updated at an interval. The maximum interval can be defined through the `Switch` constructor option `stats.computeThrottleTimeout`, defined in miliseconds.
+
+
 ### Internal Transports API
 
 ##### `switch.transport.add(key, transport, options)`
@@ -212,9 +335,10 @@ Identify is a protocol that switchs mounts on top of itself, to identify the con
 - a) peer A dials a conn to peer B
 - b) that conn gets upgraded to a stream multiplexer that both peers agree
 - c) peer B executes de identify protocol
-- d) peer B now can open streams to peer A, knowing which is the identity of peer A
+- d) peer B now can open streams to peer A, knowing which is the
+identity of peer A
 
-In addition to this, we also share the 'observed addresses' by the other peer, which is extremely useful information for different kinds of network topologies.
+In addition to this, we also share the "observed addresses" by the other peer, which is extremely useful information for different kinds of network topologies.
 
 ### Notes
 

diff --git a/package.json b/package.json
@@ -56,18 +56,21 @@
   },
   "dependencies": {
     "async": "^2.6.0",
+    "big.js": "^5.0.3",
     "debug": "^3.1.0",
     "interface-connection": "~0.3.2",
     "ip-address": "^5.8.9",
     "libp2p-circuit": "~0.1.4",
     "libp2p-identify": "~0.6.3",
     "lodash.includes": "^4.3.0",
+    "moving-average": "^1.0.0",
     "multiaddr": "^3.0.2",
     "multistream-select": "~0.14.1",
     "once": "^1.4.0",
     "peer-id": "~0.10.6",
     "peer-info": "~0.11.6",
-    "pull-stream": "^3.6.1"
+    "pull-stream": "^3.6.1",
+    "quick-lru": "^1.1.0"
   },
   "contributors": [
     "Arnaud <arnaud.valensi@gmail.com>",

diff --git a/src/connection.js b/src/connection.js
@@ -4,36 +4,33 @@ const identify = require('libp2p-identify')
 const multistream = require('multistream-select')
 const waterfall = require('async/waterfall')
 const debug = require('debug')
-const log = debug('libp2p:swarm:connection')
+const log = debug('libp2p:switch:connection')
 const once = require('once')
 const setImmediate = require('async/setImmediate')
 
 const Circuit = require('libp2p-circuit')
 
-const protocolMuxer = require('./protocol-muxer')
 const plaintext = require('./plaintext')
 
-module.exports = function connection (swarm) {
+module.exports = function connection (swtch) {
   return {
     addUpgrade () {},
 
     addStreamMuxer (muxer) {
       // for dialing
-      swarm.muxers[muxer.multicodec] = muxer
+      swtch.muxers[muxer.multicodec] = muxer
 
       // for listening
-      swarm.handle(muxer.multicodec, (protocol, conn) => {
+      swtch.handle(muxer.multicodec, (protocol, conn) => {
         const muxedConn = muxer.listener(conn)
 
-        muxedConn.on('stream', (conn) => {
-          protocolMuxer(swarm.protocols, conn)
-        })
+        muxedConn.on('stream', swtch.protocolMuxer(null))
 
         // If identify is enabled
         //   1. overload getPeerInfo
         //   2. call getPeerInfo
         //   3. add this conn to the pool
-        if (swarm.identify) {
+        if (swtch.identify) {
           // overload peerInfo to use Identify instead
           conn.getPeerInfo = (cb) => {
             const conn = muxedConn.newStream()
@@ -46,11 +43,16 @@ module.exports = function connection (swarm) {
               (conn, cb) => identify.dialer(conn, cb),
               (peerInfo, observedAddrs, cb) => {
                 observedAddrs.forEach((oa) => {
-                  swarm._peerInfo.multiaddrs.addSafe(oa)
+                  swtch._peerInfo.multiaddrs.addSafe(oa)
                 })
                 cb(null, peerInfo)
               }
-            ], cb)
+            ], (err, pi) => {
+              if (pi) {
+                conn.setPeerInfo(pi)
+              }
+              cb(err, pi)
+            })
           }
 
           conn.getPeerInfo((err, peerInfo) => {
@@ -59,7 +61,7 @@ module.exports = function connection (swarm) {
             }
             const b58Str = peerInfo.id.toB58String()
 
-            swarm.muxedConns[b58Str] = { muxer: muxedConn }
+            swtch.muxedConns[b58Str] = { muxer: muxedConn }
 
             if (peerInfo.multiaddrs.size > 0) {
               // with incomming conn and through identify, going to pick one
@@ -72,16 +74,16 @@ module.exports = function connection (swarm) {
               // no addr, use just their IPFS id
               peerInfo.connect(`/ipfs/${b58Str}`)
             }
-            peerInfo = swarm._peerBook.put(peerInfo)
+            peerInfo = swtch._peerBook.put(peerInfo)
 
             muxedConn.on('close', () => {
-              delete swarm.muxedConns[b58Str]
+              delete swtch.muxedConns[b58Str]
               peerInfo.disconnect()
-              peerInfo = swarm._peerBook.put(peerInfo)
-              setImmediate(() => swarm.emit('peer-mux-closed', peerInfo))
+              peerInfo = swtch._peerBook.put(peerInfo)
+              setImmediate(() => swtch.emit('peer-mux-closed', peerInfo))
             })
 
-            setImmediate(() => swarm.emit('peer-mux-established', peerInfo))
+            setImmediate(() => swtch.emit('peer-mux-established', peerInfo))
           })
         }
 
@@ -90,9 +92,9 @@ module.exports = function connection (swarm) {
     },
 
     reuse () {
-      swarm.identify = true
-      swarm.handle(identify.multicodec, (protocol, conn) => {
-        identify.listener(conn, swarm._peerInfo)
+      swtch.identify = true
+      swtch.handle(identify.multicodec, (protocol, conn) => {
+        identify.listener(conn, swtch._peerInfo)
       })
     },
 
@@ -106,7 +108,7 @@ module.exports = function connection (swarm) {
 
         // TODO: (dryajov) should we enable circuit listener and
         // dialer by default?
-        swarm.transport.add(Circuit.tag, new Circuit(swarm, config))
+        swtch.transport.add(Circuit.tag, new Circuit(swtch, config))
       }
     },
 
@@ -116,15 +118,15 @@ module.exports = function connection (swarm) {
         encrypt = plaintext.encrypt
       }
 
-      swarm.unhandle(swarm.crypto.tag)
-      swarm.handle(tag, (protocol, conn) => {
-        const myId = swarm._peerInfo.id
+      swtch.unhandle(swtch.crypto.tag)
+      swtch.handle(tag, (protocol, conn) => {
+        const myId = swtch._peerInfo.id
         const secure = encrypt(myId, conn, undefined, () => {
-          protocolMuxer(swarm.protocols, secure)
+          swtch.protocolMuxer(null)(secure)
         })
       })
 
-      swarm.crypto = {tag, encrypt}
+      swtch.crypto = {tag, encrypt}
     }
   }
 }