Fix 'previous' in the members tangle

index.js

@@ -214,27 +214,40 @@ function init (ssb, config) {
    * (because they can't post messages to the group before then)
    */
 
+  const memberType = (type) => type === 'group/add-member' || type === 'group/exclude-member'
+
   /* Tangle: auto-add tangles.group info to all private-group messages */
-  const getGroupTangle = GetGroupTangle(ssb, keystore)
+  const getGroupTangle = GetGroupTangle(ssb, keystore, 'group')
+  const getMembersTangle = GetGroupTangle(ssb, keystore, 'members')
   ssb.publish.hook(function (publish, args) {
     const [content, cb] = args
     if (!content.recps) return publish.apply(this, args)
 
     if (!isGroup(content.recps[0])) return publish.apply(this, args)
 
     onKeystoreReady(() => {
-      getGroupTangle(content.recps[0], (err, tangle) => {
-        // NOTE there are two ways an err can occur in getGroupTangle
-        // 1. recps is not a groupId
-        // 2. unknown groupId,
+      if (!keystore.group.has(content.recps[0])) return cb(Error('unknown groupId'))
+
+      getGroupTangle(content.recps[0], (err, groupTangle) => {
+        if (err) return cb(Error("Couldn't get group tangle", { cause: err }))
 
-        // Rather than cb(err) here we we pass it on to boxers to see if an err is needed
-        if (err) return publish.apply(this, args)
+        // we only want to have to calculate the members tangle if it's gonna be used
+        const maybeMembersTangle = memberType(content.type)
+          ? getMembersTangle
+          : (_, cb) => cb()
 
-        set(content, 'tangles.group', tangle)
-        tanglePrune(content) // prune the group tangle down if needed
+        maybeMembersTangle(content.recps[0], (err, membersTangle) => {
+          if (err) return cb(Error("Couldn't get members tangle", { cause: err }))
 
-        publish.call(this, content, cb)
+          set(content, 'tangles.group', groupTangle)
+          tanglePrune(content) // prune the group tangle down if needed
+          if (memberType(content.type)) {
+            set(content, 'tangles.members', membersTangle)
+            tanglePrune(content, 'members')
+          }
+
+          publish.call(this, content, cb)
+        })
       })
     })
   })

lib/get-group-tangle.js

@@ -5,10 +5,8 @@ const Strategy = require('@tangle/strategy')
 
 // for figuring out what "previous" should be for the group
 
-const TANGLE = 'group'
-const strategy = new Strategy({})
-
-module.exports = function GetGroupTangle (server, keystore) {
+module.exports = function GetGroupTangle (server, keystore, tangle = 'group') {
+  const strategy = new Strategy({})
   const cache = new Map([]) // groupId > new Reduce (tangleTips)
 
   // LISTEN
@@ -50,10 +48,13 @@ module.exports = function GetGroupTangle (server, keystore) {
 
     // if it's in the cache, then get the cached value, then callback
     if (cache.has(groupId)) {
-      return cb(null, {
-        root: info.root,
-        previous: Object.keys(cache.get(groupId).state)
-      })
+      // this timeout seems to help for some reason. in some cases messages were posted too fast with tangles 'in parallel', e.g. 2 messages both just having previous: [rootMsgId]
+      return setTimeout(() => {
+        return cb(null, {
+          root: info.root,
+          previous: Object.keys(cache.get(groupId).state)
+        })
+      }, 0)
     }
     // if not in cache, compute it and add to the cache
 
@@ -64,7 +65,7 @@ module.exports = function GetGroupTangle (server, keystore) {
           value: {
             content: {
               tangles: {
-                [TANGLE]: { root: info.root }
+                [tangle]: { root: info.root }
               }
             }
           }
@@ -73,7 +74,7 @@ module.exports = function GetGroupTangle (server, keystore) {
       {
         $map: {
           key: ['key'],
-          previous: ['value', 'content', 'tangles', TANGLE, 'previous']
+          previous: ['value', 'content', 'tangles', tangle, 'previous']
         }
       }
     ]

method/group.js

@@ -99,13 +99,9 @@ module.exports = function GroupMethods (ssb, keystore, state) {
         type: 'group/exclude-member',
         excludes: authorIds,
         tangles: {
-          members: {
-            root,
-            previous: [root] // TODO calculate previous for members tangle
-          },
-
+          members: { root, previous: [root] },
           group: { root, previous: [root] }
-          // NOTE: this is a dummy entry which is over-written in publish hook
+          // NOTE: these are dummy entries which are over-written in the publish hook
         },
         recps: [groupId]
       }

test/api/exclude-members.test.js

@@ -38,7 +38,7 @@ test('tribes.excludeMembers', async t => {
       excludes: authorIds,
 
       tangles: {
-        members: { root: groupInitMsg.key, previous: [groupInitMsg.key] },
+        members: { root: groupInitMsg.key, previous: [...exclude.content.tangles.members.previous] },
         group: { root: groupInitMsg.key, previous: [...exclude.content.tangles.group.previous] }
       },
       recps: [groupId]

test/api/invite.test.js

@@ -8,6 +8,8 @@ test('tribes.invite', async t => {
   const { groupId, groupKey, groupInitMsg } = await p(kaitiaki.tribes.create)({})
   t.true(groupId, 'creates group')
 
+  const selfAdd = await p(kaitiaki.getLatest)(kaitiaki.id)
+
   const authorIds = [
     newPerson.id,
     FeedId()
@@ -28,8 +30,8 @@ test('tribes.invite', async t => {
     recps: [groupId, ...authorIds],
 
     tangles: {
-      group: { root: groupInitMsg.key, previous: [groupInitMsg.key] },
-      members: { root: groupInitMsg.key, previous: [groupInitMsg.key] }
+      group: { root: groupInitMsg.key, previous: [selfAdd.key] },
+      members: { root: groupInitMsg.key, previous: [selfAdd.key] }
     }
   }
   t.deepEqual(invite.content, expected, 'kaitiaki sent invite')

test/lib/get-group-tangle.test.js

@@ -1,3 +1,4 @@
+const { promisify: p } = require('util')
 const test = require('tape')
 const { Server, replicate } = require('../helpers')
 const pull = require('pull-stream')
@@ -89,13 +90,14 @@ test('get-group-tangle (cache)', t => {
   server.tribes.create(null, (err, data) => {
     if (err) throw err
 
-    t.equal(queryCalls, 1, 'no cache for publishing of group/add-member, a backlink query was run')
+    // 1 for group tangle, 1 for members tangle
+    t.equal(queryCalls, 2, 'no cache for publishing of group/add-member, a backlink query was run')
     const content = { type: 'memo', recps: [data.groupId] }
 
     server.publish(content, (err, msg) => {
       if (err) throw err
 
-      t.equal(queryCalls, 1, 'cache used for publishing next message')
+      t.equal(queryCalls, 2, 'cache used for publishing next message')
 
       server.close()
       t.end()
@@ -141,7 +143,7 @@ test(`get-group-tangle-${n}-publishes`, t => {
 test('get-group-tangle', t => {
   const tests = [
     {
-      plan: 4,
+      plan: 5,
       test: (t) => {
         const DESCRIPTION = 'auto adds group tangle'
         // this is an integration test, as we've hooked get-group-tangle into ssb.publish
@@ -150,27 +152,31 @@ test('get-group-tangle', t => {
         ssb.tribes.create(null, (err, data) => {
           t.error(err, 'create group')
 
-          const groupRoot = data.groupInitMsg.key
-          const groupId = data.groupId
+          ssb.getLatest(ssb.id, (err, selfAdd) => {
+            t.error(err, 'get self invite')
 
-          const content = {
-            type: 'yep',
-            recps: [groupId]
-          }
+            const groupRoot = data.groupInitMsg.key
+            const groupId = data.groupId
 
-          ssb.publish(content, (err, msg) => {
-            t.error(err, 'publish a message')
+            const content = {
+              type: 'yep',
+              recps: [groupId]
+            }
 
-            ssb.get({ id: msg.key, private: true }, (err, A) => {
-              t.error(err, 'get that message back')
+            ssb.publish(content, (err, msg) => {
+              t.error(err, 'publish a message')
 
-              t.deepEqual(
-                A.content.tangles.group, // actual
-                { root: groupRoot, previous: [groupRoot] }, // expected
-                DESCRIPTION + ' (auto added tangles.group)'
-              )
+              ssb.get({ id: msg.key, private: true }, (err, A) => {
+                t.error(err, 'get that message back')
 
-              ssb.close()
+                t.deepEqual(
+                  A.content.tangles.group, // actual
+                  { root: groupRoot, previous: [selfAdd.key] }, // expected
+                  DESCRIPTION + ' (auto added tangles.group)'
+                )
+
+                ssb.close()
+              })
             })
           })
         })
@@ -286,3 +292,44 @@ test('get-group-tangle with branch', t => {
     })
   }
 })
+
+test('members tangle', async t => {
+  const alice = Server()
+  const bob = Server()
+
+  const { groupId, root } = await p(alice.tribes.create)({})
+  await p(setTimeout)(300)
+  const bobInvite = await p(alice.tribes.invite)(groupId, [bob.id], {})
+
+  const keystore = { group: { get: () => ({ root }) } }
+
+  const _getGroupTangle = p(GetGroupTangle(alice, keystore, 'group'))
+  const _getMembersTangle = p(GetGroupTangle(alice, keystore, 'members'))
+  const getGroupTangle = p((id, cb) => {
+    setTimeout(() => _getGroupTangle(id, cb), 300)
+  })
+  const getMembersTangle = p((id, cb) => {
+    setTimeout(() => _getMembersTangle(id, cb), 300)
+  })
+
+  const firstGroup = await getGroupTangle(groupId)
+  const firstMembers = await getMembersTangle(groupId)
+
+  t.deepEqual(firstGroup, { root, previous: [bobInvite.key] }, 'group tangle generated after add msg is correct')
+  t.deepEqual(firstMembers, { root, previous: [bobInvite.key] }, 'members tangle generated after add msg is correct')
+
+  const { key: bobExcludeKey } = await p(alice.tribes.excludeMembers)(groupId, [bob.id])
+  const bobExclude = await p(alice.get)({ id: bobExcludeKey, private: true })
+
+  t.deepEqual(bobExclude.content.tangles, { group: firstGroup, members: firstMembers }, 'exclude message gets tangles')
+
+  const secondGroup = await getGroupTangle(groupId)
+  const secondMembers = await getMembersTangle(groupId)
+
+  t.deepEqual(secondGroup, { root, previous: [bobExcludeKey] }, 'group tangle generated after exclude msg is correct')
+  t.deepEqual(secondMembers, { root, previous: [bobExcludeKey] }, 'members tangle generated after exclude msg is correct')
+
+  await Promise.all([p(alice.close)(), p(bob.close)()])
+
+  t.end()
+})