fix(discovery): show new public guilds on remote Explore immediately

Invalidate cached Explore listings when DIRECTORY_LISTING arrives, publish
new guilds to the discovery mesh after create, and re-sync on peer connect.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -754,10 +754,12 @@ class PearcordPlatform extends EventEmitter {
     if (!this.discovery || this._discoveryWired) return
     this._discoveryWired = true
     this.discovery.on('listing', (row) => {
+      this._invalidateDiscoveryListingsCache()
       this._noteDiscoveryListingDelta(row)
       this.emit('discovery')
     })
     this.discovery.on('listing-prune', ({ removed }) => {
+      this._invalidateDiscoveryListingsCache()
       if (removed > 0) {
         this._discoveryDiffHint = `${removed} stale listing${removed === 1 ? '' : 's'} pruned`
         this._discoveryDiffUntil = Date.now() + 8000
@@ -782,6 +784,7 @@ class PearcordPlatform extends EventEmitter {
       })
     })
     this.discovery.on('listing-revoke', (payload) => {
+      this._invalidateDiscoveryListingsCache()
       const guildId = payload?.guildId || payload?.id
       if (!guildId) return
       this.db
@@ -819,12 +822,21 @@ class PearcordPlatform extends EventEmitter {
       const members = await this.db.find(COLLECTIONS.MEMBERS, { guildId: g.id })
       const prev = publicRows.find((r) => r.id === g.id)
       const tags = await this.discovery.getGuildDiscoveryTags(g.id)
+      let inviteCode = prev?.inviteCode || null
+      if (!inviteCode && this.guild?.guild?.id === g.id) {
+        const inv = await this.createInvite().catch(() => null)
+        inviteCode = inv?.shareCode || inv?.code || null
+      }
       await this.discovery.announceGuild(g, {
-        inviteCode: prev?.inviteCode || null,
+        inviteCode,
         memberCount: members.length || 1,
         tags
       })
     }
+    if (this.discovery._meshJoined) {
+      await this.discovery.syncCachedListingsToMesh().catch(() => {})
+    }
+    this._invalidateDiscoveryListingsCache()
   }
 
   async _leaveMeshes () {
@@ -2451,6 +2463,25 @@ class PearcordPlatform extends EventEmitter {
     })
   }
 
+  _invalidateDiscoveryListingsCache () {
+    this._cachedPublicListings = null
+    this._cachedPublicListingsAt = 0
+  }
+
+  async _publishGuildToDiscoveryMesh (guild, opts = {}) {
+    if (!this.discovery || !guild?.id) return null
+    await this._joinDiscoveryMesh().catch(() => {})
+    const listed = await this.discovery.isGuildPublicListing(guild.id)
+    if (!listed) return null
+    const listing = await this.discovery.announceGuild(guild, opts)
+    if (listing && this.discovery._meshJoined) {
+      await this.discovery.syncCachedListingsToMesh().catch(() => {})
+    }
+    this._invalidateDiscoveryListingsCache()
+    this.emit('discovery')
+    return listing
+  }
+
   _noteDiscoveryListingDelta (row) {
     if (!row?.id) {
       this._discoveryDiffHint = 'Discovery listings updated'
@@ -2472,6 +2503,7 @@ class PearcordPlatform extends EventEmitter {
     const pruned = await this.discovery.pruneStaleListings()
     const synced = await this.discovery.syncCachedListingsToMesh()
     this._discoveryMeshRefreshAt = Date.now()
+    this._invalidateDiscoveryListingsCache()
     this.emit('discovery')
     return { synced, pruned: pruned.removed || 0 }
   }
@@ -2494,10 +2526,15 @@ class PearcordPlatform extends EventEmitter {
           inviteCode = prev?.inviteCode || null
           memberCount = prev?.memberCount || 1
         }
-        await this.discovery.announceGuild(guild, { inviteCode, memberCount, tags: row.discoveryTags })
-      }
+        await this._publishGuildToDiscoveryMesh(guild, {
+          inviteCode,
+          memberCount,
+          tags: row.discoveryTags
+        })
       }
+    } else {
       this.emit('discovery')
+    }
     return { guildId, tags: row.discoveryTags }
   }
 
@@ -7875,7 +7912,7 @@ class PearcordPlatform extends EventEmitter {
     }
     const inv = await this.createInvite().catch(() => null)
     if (listOnDiscovery) {
-      await this.discovery?.announceGuild(result.guild, {
+      await this._publishGuildToDiscoveryMesh(result.guild, {
         inviteCode: inv?.shareCode || inv?.code || null,
         memberCount: 1
       }).catch(() => {})
@@ -9023,9 +9060,11 @@ class PearcordPlatform extends EventEmitter {
           inviteCode = inv.shareCode || inv.code
           memberCount = (await this.guild.listMembers()).length
         }
-        await this.discovery.announceGuild(guild, { inviteCode, memberCount })
-      }
+        await this._publishGuildToDiscoveryMesh(guild, { inviteCode, memberCount })
+      } else {
+        this._invalidateDiscoveryListingsCache()
         this.emit('discovery')
+      }
       span.end({
         spanKind: 'discovery.publish',
         guildId,