2 files changed, 47 insertions, 0 deletions

diff --git a/server/lib/cache/actor-follow-score-cache.ts b/server/lib/cache/actor-follow-score-cache.ts
new file mode 100644
index 000000000..d070bde09
--- /dev/null
+++ b/server/lib/cache/actor-follow-score-cache.ts
@@ -0,0 +1,46 @@
+import { ACTOR_FOLLOW_SCORE } from '../../initializers'
+import { logger } from '../../helpers/logger'
+
+// Cache follows scores, instead of writing them too often in database
+// Keep data in memory, we don't really need Redis here as we don't really care to loose some scores
+class ActorFollowScoreCache {
+
+  private static instance: ActorFollowScoreCache
+  private pendingFollowsScore: { [ url: string ]: number } = {}
+
+  private constructor () {}
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+
+  updateActorFollowsScore (goodInboxes: string[], badInboxes: string[]) {
+    if (goodInboxes.length === 0 && badInboxes.length === 0) return
+
+    logger.info('Updating %d good actor follows and %d bad actor follows scores in cache.', goodInboxes.length, badInboxes.length)
+
+    for (const goodInbox of goodInboxes) {
+      if (this.pendingFollowsScore[goodInbox] === undefined) this.pendingFollowsScore[goodInbox] = 0
+
+      this.pendingFollowsScore[goodInbox] += ACTOR_FOLLOW_SCORE.BONUS
+    }
+
+    for (const badInbox of badInboxes) {
+      if (this.pendingFollowsScore[badInbox] === undefined) this.pendingFollowsScore[badInbox] = 0
+
+      this.pendingFollowsScore[badInbox] += ACTOR_FOLLOW_SCORE.PENALTY
+    }
+  }
+
+  getPendingFollowsScoreCopy () {
+    return this.pendingFollowsScore
+  }
+
+  clearPendingFollowsScore () {
+    this.pendingFollowsScore = {}
+  }
+}
+
+export {
+  ActorFollowScoreCache
+}
diff --git a/server/lib/cache/index.ts b/server/lib/cache/index.ts
index 54eb983fa..e921d04a7 100644
--- a/server/lib/cache/index.ts
+++ b/server/lib/cache/index.ts
@@ -1,2 +1,3 @@
+export * from './actor-follow-score-cache'
 export * from './videos-preview-cache'
 export * from './videos-caption-cache'