clean up feed decay

lib/index.js

@@ -7,13 +7,28 @@ module.exports = {
   permissions: {
     anonymous: {},
   },
+
+  /**
+   * @param {any} peer
+   * @param {{
+   *   gc?: {
+   *     maxLogBytes?: number
+   *   }
+   * }} config
+   */
   init(peer, config) {
+    // Assertions
     if (!peer.goals) throw new Error('gc requires the goals plugin')
+    if (typeof config.gc?.maxLogBytes !== 'number') {
+      throw new Error('gc requires config.gc.maxLogBytes')
+    }
+
+    // State
     const debug = makeDebug('ppppp:gc')
 
-    function purgeGoallessMsgs(cb) {
-      debug('purge goalless msgs')
-      const done = multicb()
+    function cleanup(cb) {
+      debug('cleanup goalless started')
+      const done = multicb({ pluck: 1 })
       let waitingForDels = false
       for (const rec of peer.db.records()) {
         if (!rec.msg) continue
@@ -21,17 +36,22 @@ module.exports = {
         if (goals.length === 0) {
           peer.db.del(rec.id, done())
           waitingForDels = true
+        } else {
         }
       }
-      if (waitingForDels) done(cb)
-      else cb()
+      function whenEnded(err) {
+        // prettier-ignore
+        if (err) debug('cleanup goalless ended with an error %s', err.message ?? err)
+        else debug('cleanup goalless ended')
+        cb()
+      }
+      if (waitingForDels) done(whenEnded)
+      else whenEnded()
     }
 
-    function initiate() {}
-
     function forceImmediately(cb) {
       debug('force immediately')
-      purgeGoallessMsgs(cb)
+      cleanup(cb)
     }
 
     return {

test/feed-decay.test.js

@@ -0,0 +1,52 @@
+const test = require('node:test')
+const assert = require('node:assert')
+const p = require('node:util').promisify
+const { createPeer } = require('./util')
+
+function getTexts(msgs) {
+  return msgs.filter((msg) => msg.data?.text).map((msg) => msg.data.text)
+}
+
+test('feed decay', async (t) => {
+  const alice = createPeer({
+    name: 'alice',
+    gc: { maxLogBytes: 100 * 1024 * 1024 },
+  })
+
+  await alice.db.loaded()
+
+  // Alice creates her own account
+  const aliceID = await p(alice.db.account.create)({
+    domain: 'account',
+    _nonce: 'alice',
+  })
+
+  for (let i = 0; i < 5; i++) {
+    await p(alice.db.feed.publish)({
+      account: aliceID,
+      domain: 'post',
+      data: { text: 'A' + i },
+    })
+  }
+
+  assert.deepEqual(
+    getTexts([...alice.db.msgs()]),
+    ['A0', 'A1', 'A2', 'A3', 'A4'],
+    'alice has the whole feed'
+  )
+
+  alice.goals.set(aliceID, 'all') // alice wants her account tangle
+  const postFeedID = alice.db.feed.getID(aliceID, 'post')
+  alice.goals.set(postFeedID, 'newest-3')
+  assert('alice set a goal for newest-3 of post feed')
+
+  await p(alice.gc.forceImmediately)()
+
+  assert.deepEqual(
+    getTexts([...alice.db.msgs()]),
+    ['A2', 'A3', 'A4'],
+    'alice has only latest 3 msgs in the feed'
+  )
+
+  await p(alice.close)(true)
+})

test/orphan-weave.test.js

@@ -11,8 +11,11 @@ function getTexts(msgs) {
   return msgs.filter((msg) => msg.data?.text).map((msg) => msg.data.text)
 }
 
-test('purge an orphan weave', async (t) => {
-  const alice = createPeer({ name: 'alice' })
+test('orphan weave msgs', async (t) => {
+  const alice = createPeer({
+    name: 'alice',
+    gc: { maxLogBytes: 100 * 1024 * 1024 },
+  })
 
   await alice.db.loaded()
 
@@ -27,7 +30,7 @@ test('purge an orphan weave', async (t) => {
     keypair: bobKeypair,
     _nonce: 'bob',
   })
-  // Alice creates Bob
+  // Alice creates Carol
   const carolID = await p(alice.db.account.create)({
     domain: 'account',
     keypair: carolKeypair,