Add peer.remoteContiguousLength

lib/replicator.js

@@ -308,6 +308,7 @@ class Peer {
 
     this.remoteFork = 0
     this.remoteLength = 0
+    this.remoteContiguousLength = 0
     this.remoteCanUpgrade = false
     this.remoteUploading = true
     this.remoteDownloading = true
@@ -679,6 +680,11 @@ class Peer {
   }
 
   onrange ({ drop, start, length }) {
+    // console.log(this.stream.publicKey.slice(0, 3).toString('hex'), this.stream.remotePublicKey.slice(0, 3).toString('hex'), this.$id, 'onrange', { drop, start, length })
+
+    if (start === 0) this.remoteContiguousLength = length
+    if (drop) this.remoteContiguousLength = Math.min(this.remoteContiguousLength, start)
+
     const has = drop === false
 
     this.remoteBitfield.setRange(start, length, has)

test/remote-length.js

@@ -0,0 +1,187 @@
+const test = require('brittle')
+const { create, replicate } = require('./helpers')
+
+test('peer with partial remote contig length', async function (t) {
+  const core = await create()
+  const a = await create(core.key)
+  const b = await create(core.key)
+
+  await core.append(['a', 'b', 'c', 'd', 'e', 'f'])
+
+  replicate(core, a, t)
+  replicate(a, b, t)
+
+  // "A" has all the blocks
+  await a.download({ start: 0, end: core.length }).done()
+  t.is(a.contiguousLength, core.length)
+
+  // "B" gets them blocks from "A"
+  await b.get(0)
+  await b.get(1)
+  await b.get(2)
+  // await b.get(3)
+  // await b.get(4)
+  // await b.get(5)
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+
+  // For example, "A" wants to know if "B" is finished syncing
+  const peer = a.replicator.peers.find(peer => peer.remotePublicKey.equals(b.replicator.peers[0].stream.publicKey)) // (unsure if this peers[0] is precise)
+  console.log('B remote contig length', peer.remoteContiguousLength) // => 1
+  console.log('B local contig length ', b.contiguousLength) // => 3
+  t.is(b.contiguousLength, peer.remoteContiguousLength)
+
+  // One of them always shows "1" which is "B"
+  console.log(a.replicator.peers.map(peer => peer.remoteContiguousLength))
+  console.log(b.replicator.peers.map(peer => peer.remoteContiguousLength))
+})
+
+test('peer with complete remote contig length', async function (t) {
+  const core = await create()
+  const a = await create(core.key)
+  const b = await create(core.key)
+
+  await core.append(['a', 'b', 'c', 'd', 'e', 'f'])
+
+  replicate(core, a, t)
+  replicate(a, b, t)
+
+  await a.download({ start: 0, end: core.length }).done()
+  t.is(a.contiguousLength, core.length)
+
+  await b.get(0)
+  await b.get(1)
+  await b.get(2)
+  await b.get(3)
+  await b.get(4)
+  await b.get(5)
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+
+  const peer = a.replicator.peers.find(peer => peer.remotePublicKey.equals(b.replicator.peers[0].stream.publicKey))
+  t.is(b.contiguousLength, peer.remoteContiguousLength)
+})
+
+/* test.skip('basic replication', async function (t) {
+  const core = await create()
+  const a = await create(core.key)
+  const b = await create(core.key)
+  const c = await create(core.key)
+
+  await core.append(['a', 'b', 'c', 'd', 'e', 'f'])
+
+  // core.core.$id = 'w'
+  a.core.$id = 'a'
+  // b.core.$id = 'b'
+  // c.core.$id = 'c'
+
+  const ra = replicate(core, a, t)
+  const ab = replicate(a, b, t)
+  const bc = replicate(b, c, t)
+
+  console.log(ra[0].publicKey.slice(0, 3).toString('hex'), '=> core')
+  console.log(ra[1].publicKey.slice(0, 3).toString('hex'), '=> a')
+  console.log()
+
+  console.log(ab[0].publicKey.slice(0, 3).toString('hex'), '=> a')
+  console.log(ab[1].publicKey.slice(0, 3).toString('hex'), '=> b')
+  console.log()
+
+  console.log(bc[0].publicKey.slice(0, 3).toString('hex'), '=> b')
+  console.log(bc[1].publicKey.slice(0, 3).toString('hex'), '=> c')
+  console.log()
+
+  await a.update({ wait: true })
+  await b.update({ wait: true })
+  await c.update({ wait: true })
+
+  const peer = a.replicator.peers.find(peer => peer.remotePublicKey.equals(b.replicator.peers[0].stream.publicKey))
+  peer.$id = 'b'
+
+  // "A" has all the blocks
+  await a.download({ start: 0, end: core.length }).done()
+
+  // "B" is getting them from "A"
+  await b.get(1)
+  await b.get(2)
+  await b.get(0)
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+
+  console.log('writer length', core.contiguousLength, core.length) // 5 / 5 ()
+  console.log('a core length', a.contiguousLength, a.length) // 5 / 5 ()
+  console.log('b core length', b.contiguousLength, b.length) // 3 / 5 ()
+  console.log('c core length', c.contiguousLength, c.length) // 0 / 5 ()
+
+  // console.log(core.replicator.peers[0])
+
+  // From "a" perspective, this is "b" peer which it should have a remote contig length of 3
+  // console.log(a.replicator.peers[0])
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+})
+
+test.skip('basic replication', async function (t) {
+  const core = await create()
+  const a = await create(core.key)
+  const b = await create(core.key)
+  const c = await create(core.key)
+
+  core.core.$id = 'w'
+  a.core.$id = 'a'
+  b.core.$id = 'b'
+  c.core.$id = 'c'
+
+  const ra = replicate(core, a, t)
+  const ab = replicate(a, b, t)
+  const bc = replicate(b, c, t)
+
+  await a.update({ wait: true })
+  await b.update({ wait: true })
+
+  // const peer = a.replicator.peers.find(peer => peer.remotePublicKey.equals(b.replicator.peers[0].stream.publicKey)) // Or just peers[1]
+  // peer.$id = 'b'
+
+  const peer = b.replicator.peers.find(peer => peer.remotePublicKey.equals(c.replicator.peers[0].stream.publicKey)) // Or just peers[1]
+  peer.$id = 'c'
+
+  await core.append('a')
+  await a.get(0)
+  await b.get(0)
+
+  await core.append('b')
+  await a.get(1)
+  await b.get(1)
+
+  await core.append('c')
+  await a.get(2)
+  await b.get(2)
+
+  await core.append('d')
+  await a.get(3)
+  await b.get(3)
+  await c.get(3)
+
+  await core.append('e')
+  await a.get(4)
+
+  await core.append('f')
+  await a.get(5)
+
+  // await c.get(1)
+  await c.get(0)
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+
+  console.log('writer length', core.contiguousLength, core.length) // 5 / 5 ()
+  console.log('a core length', a.contiguousLength, a.length) // 5 / 5 ()
+  console.log('b core length', b.contiguousLength, b.length) // 3 / 5 ()
+  console.log('c core length', c.contiguousLength, c.length) // 0 / 5 ()
+
+  // console.log(core.replicator.peers[0])
+
+  // From "a" perspective, this is "b" peer which it should have a remote contig length of 3
+  // console.log(a.replicator.peers[0])
+
+  await new Promise(resolve => setTimeout(resolve, 100))
+}) */