feat: add autorenew functionality

Author: dryajov

src/index.js

@@ -4,20 +4,59 @@ const NatPmp = require('./mappers/pmp')
 const UPnP = require('./mappers/upnp')
 const EE = require('events')
 const tryEach = require('async/tryEach')
+const eachSeries = require('async/eachSeries')
 const parallel = require('async/parallel')
 const waterfall = require('async/waterfall')
 const network = require('network')
 
+const log = require('debug')('libp2p-nat-mngr')
+
 class NatManager extends EE {
-  constructor (mappers) {
+  constructor (mappers, options) {
     super()
 
+    options = options || {
+      autorenew: true,
+      every: 60 * 10 * 1000
+    }
+
     this.mappers = mappers || [
       new NatPmp(),
       new UPnP()
     ]
 
     this.activeMappings = {}
+
+    if (options.autorenew) {
+      setInterval(() => {
+        this.renewMappings()
+      }, options.every)
+    }
+  }
+
+  renewMappings (callback) {
+    callback = callback || (() => {})
+    this.getPublicIp((err, ip) => {
+      if (err) {
+        return log(err)
+      }
+
+      eachSeries(Object.keys(this.activeMappings), (key, cb) => {
+        const mapping = this.activeMappings[key].mappings[key]
+        if (mapping.externalIp !== ip) {
+          delete this.activeMappings[key]
+          this.addMapping(mapping.internalPort,
+            mapping.externalPort,
+            mapping.ttl,
+            (err) => {
+              if (err) {
+                return log(err)
+              }
+              return cb()
+            })
+        }
+      }, callback)
+    })
   }
 
   addMapping (intPort, extPort, ttl, callback) {
@@ -33,6 +72,7 @@ class NatManager extends EE {
 
             const mapKey = `${mapping.externalIp}:${mapping.externalPort}`
             this.activeMappings[mapKey] = mapper
+            this.emit('mapping', mapping)
             cb(null, mapping)
           })
       }

test/manager.js

@@ -17,7 +17,7 @@ describe('NAT manager', () => {
         super('mapper1')
       }
 
-      _addPortMapping (intPort, extPort, lifetime, cb) {
+      _addPortMapping (intPort, extPort, ttl, cb) {
         cb(null, this.newMapping(intPort))
       }
     }
@@ -38,7 +38,7 @@ describe('NAT manager', () => {
     let fail = true
 
     class Mapper1 extends Mapper {
-      _addPortMapping (intPort, extPort, lifetime, cb) {
+      _addPortMapping (intPort, extPort, ttl, cb) {
         cb(fail ? new Error('fail') : null, this.newMapping(intPort))
         fail = false
       }
@@ -57,4 +57,29 @@ describe('NAT manager', () => {
       done()
     })
   })
+
+  it('should renew mapping', (done) => {
+    class Mapper1 extends Mapper {
+      _addPortMapping (intPort, extPort, ttl, cb) {
+        const mapping = this.newMapping(intPort)
+        mapping.externalIp = '127.0.0.1'
+        mapping.externalPort = intPort
+        cb(null, mapping)
+      }
+    }
+
+    const manager = new Manager([
+      new Mapper1('1')
+    ])
+
+    manager.addMapping(55555, 55555, 0, (err, mapping) => {
+      manager.renewMappings(() => {
+        expect(err).to.not.exist()
+        expect(mapping).to.exist()
+        expect(mapping.protocol).to.eql('1')
+        expect(mapping.internalPort).to.eql(55555)
+        done()
+      })
+    })
+  })
 })