Move server follow in the job queue

It helps to track follow errors

4 files changed, 89 insertions, 64 deletions

diff --git a/server/controllers/api/server/follows.ts b/server/controllers/api/server/follows.ts
index bb0063473..e78361c9a 100644
--- a/server/controllers/api/server/follows.ts
+++ b/server/controllers/api/server/follows.ts
@@ -1,20 +1,22 @@
 import * as express from 'express'
 import { UserRight } from '../../../../shared/models/users'
-import { sanitizeHost } from '../../../helpers/core-utils'
-import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { logger } from '../../../helpers/logger'
 import { getFormattedObjects, getServerActor } from '../../../helpers/utils'
-import { loadActorUrlOrGetFromWebfinger } from '../../../helpers/webfinger'
-import { REMOTE_SCHEME, sequelizeTypescript, SERVER_ACTOR_NAME } from '../../../initializers'
-import { getOrCreateActorAndServerAndModel } from '../../../lib/activitypub/actor'
-import { sendFollow, sendUndoFollow } from '../../../lib/activitypub/send'
+import { sequelizeTypescript } from '../../../initializers'
+import { sendUndoFollow } from '../../../lib/activitypub/send'
 import {
-  asyncMiddleware, authenticate, ensureUserHasRight, paginationValidator, removeFollowingValidator, setBodyHostsPort, setDefaultSort,
-  setDefaultPagination
+  asyncMiddleware,
+  authenticate,
+  ensureUserHasRight,
+  paginationValidator,
+  removeFollowingValidator,
+  setBodyHostsPort,
+  setDefaultPagination,
+  setDefaultSort
 } from '../../../middlewares'
 import { followersSortValidator, followingSortValidator, followValidator } from '../../../middlewares/validators'
-import { ActorModel } from '../../../models/activitypub/actor'
 import { ActorFollowModel } from '../../../models/activitypub/actor-follow'
+import { JobQueue } from '../../../lib/job-queue'
 
 const serverFollowsRouter = express.Router()
 serverFollowsRouter.get('/following',
@@ -30,7 +32,7 @@ serverFollowsRouter.post('/following',
   ensureUserHasRight(UserRight.MANAGE_SERVER_FOLLOW),
   followValidator,
   setBodyHostsPort,
-  asyncMiddleware(followRetry)
+  asyncMiddleware(followInstance)
 )
 
 serverFollowsRouter.delete('/following/:host',
@@ -70,67 +72,17 @@ async function listFollowers (req: express.Request, res: express.Response, next:
   return res.json(getFormattedObjects(resultList.data, resultList.total))
 }
 
-async function followRetry (req: express.Request, res: express.Response, next: express.NextFunction) {
+async function followInstance (req: express.Request, res: express.Response, next: express.NextFunction) {
   const hosts = req.body.hosts as string[]
-  const fromActor = await getServerActor()
-
-  const tasks: Promise<any>[] = []
-  const actorName = SERVER_ACTOR_NAME
 
   for (const host of hosts) {
-    const sanitizedHost = sanitizeHost(host, REMOTE_SCHEME.HTTP)
-
-    // We process each host in a specific transaction
-    // First, we add the follow request in the database
-    // Then we send the follow request to other actor
-    const p = loadActorUrlOrGetFromWebfinger(actorName, sanitizedHost)
-      .then(actorUrl => getOrCreateActorAndServerAndModel(actorUrl))
-      .then(targetActor => {
-        const options = {
-          arguments: [ fromActor, targetActor ],
-          errorMessage: 'Cannot follow with many retries.'
-        }
-
-        return retryTransactionWrapper(follow, options)
-      })
-      .catch(err => logger.warn('Cannot follow server %s.', sanitizedHost, { err }))
-
-    tasks.push(p)
+    JobQueue.Instance.createJob({ type: 'activitypub-follow', payload: { host } })
+      .catch(err => logger.error('Cannot create follow job for %s.', host, err))
   }
 
-  // Don't make the client wait the tasks
-  Promise.all(tasks)
-    .catch(err => logger.error('Error in follow.', { err }))
-
   return res.status(204).end()
 }
 
-function follow (fromActor: ActorModel, targetActor: ActorModel) {
-  if (fromActor.id === targetActor.id) {
-    throw new Error('Follower is the same than target actor.')
-  }
-
-  return sequelizeTypescript.transaction(async t => {
-    const [ actorFollow ] = await ActorFollowModel.findOrCreate({
-      where: {
-        actorId: fromActor.id,
-        targetActorId: targetActor.id
-      },
-      defaults: {
-        state: 'pending',
-        actorId: fromActor.id,
-        targetActorId: targetActor.id
-      },
-      transaction: t
-    })
-    actorFollow.ActorFollowing = targetActor
-    actorFollow.ActorFollower = fromActor
-
-    // Send a notification to remote server
-    await sendFollow(actorFollow)
-  })
-}
-
 async function removeFollow (req: express.Request, res: express.Response, next: express.NextFunction) {
   const follow: ActorFollowModel = res.locals.follow
 
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 9fde989c5..ffcbe69b8 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -65,6 +65,7 @@ const JOB_ATTEMPTS: { [ id in JobType ]: number } = {
   'activitypub-http-broadcast': 5,
   'activitypub-http-unicast': 5,
   'activitypub-http-fetcher': 5,
+  'activitypub-follow': 5,
   'video-file': 1,
   'email': 5
 }
@@ -72,6 +73,7 @@ const JOB_CONCURRENCY: { [ id in JobType ]: number } = {
   'activitypub-http-broadcast': 1,
   'activitypub-http-unicast': 5,
   'activitypub-http-fetcher': 1,
+  'activitypub-follow': 3,
   'video-file': 1,
   'email': 5
 }
diff --git a/server/lib/job-queue/handlers/activitypub-follow.ts b/server/lib/job-queue/handlers/activitypub-follow.ts
new file mode 100644
index 000000000..6764a4037
--- /dev/null
+++ b/server/lib/job-queue/handlers/activitypub-follow.ts
@@ -0,0 +1,68 @@
+import * as kue from 'kue'
+import { logger } from '../../../helpers/logger'
+import { getServerActor } from '../../../helpers/utils'
+import { REMOTE_SCHEME, sequelizeTypescript, SERVER_ACTOR_NAME } from '../../../initializers'
+import { sendFollow } from '../../activitypub/send'
+import { sanitizeHost } from '../../../helpers/core-utils'
+import { loadActorUrlOrGetFromWebfinger } from '../../../helpers/webfinger'
+import { getOrCreateActorAndServerAndModel } from '../../activitypub/actor'
+import { retryTransactionWrapper } from '../../../helpers/database-utils'
+import { ActorFollowModel } from '../../../models/activitypub/actor-follow'
+import { ActorModel } from '../../../models/activitypub/actor'
+
+export type ActivitypubFollowPayload = {
+  host: string
+}
+
+async function processActivityPubFollow (job: kue.Job) {
+  const payload = job.data as ActivitypubFollowPayload
+  const host = payload.host
+
+  logger.info('Processing ActivityPub follow in job %d.', job.id)
+
+  const sanitizedHost = sanitizeHost(host, REMOTE_SCHEME.HTTP)
+
+  const actorUrl = await loadActorUrlOrGetFromWebfinger(SERVER_ACTOR_NAME, sanitizedHost)
+  const targetActor = await getOrCreateActorAndServerAndModel(actorUrl)
+
+  const fromActor = await getServerActor()
+  const options = {
+    arguments: [ fromActor, targetActor ],
+    errorMessage: 'Cannot follow with many retries.'
+  }
+
+  return retryTransactionWrapper(follow, options)
+}
+// ---------------------------------------------------------------------------
+
+export {
+  processActivityPubFollow
+}
+
+// ---------------------------------------------------------------------------
+
+function follow (fromActor: ActorModel, targetActor: ActorModel) {
+  if (fromActor.id === targetActor.id) {
+    throw new Error('Follower is the same than target actor.')
+  }
+
+  return sequelizeTypescript.transaction(async t => {
+    const [ actorFollow ] = await ActorFollowModel.findOrCreate({
+      where: {
+        actorId: fromActor.id,
+        targetActorId: targetActor.id
+      },
+      defaults: {
+        state: 'pending',
+        actorId: fromActor.id,
+        targetActorId: targetActor.id
+      },
+      transaction: t
+    })
+    actorFollow.ActorFollowing = targetActor
+    actorFollow.ActorFollower = fromActor
+
+    // Send a notification to remote server
+    await sendFollow(actorFollow)
+  })
+}
diff --git a/server/lib/job-queue/job-queue.ts b/server/lib/job-queue/job-queue.ts
index 1dc28755e..bf40a9206 100644
--- a/server/lib/job-queue/job-queue.ts
+++ b/server/lib/job-queue/job-queue.ts
@@ -8,11 +8,13 @@ import { ActivitypubHttpFetcherPayload, processActivityPubHttpFetcher } from './
 import { ActivitypubHttpUnicastPayload, processActivityPubHttpUnicast } from './handlers/activitypub-http-unicast'
 import { EmailPayload, processEmail } from './handlers/email'
 import { processVideoFile, VideoFilePayload } from './handlers/video-file'
+import { ActivitypubFollowPayload, processActivityPubFollow } from './handlers/activitypub-follow'
 
 type CreateJobArgument =
   { type: 'activitypub-http-broadcast', payload: ActivitypubHttpBroadcastPayload } |
   { type: 'activitypub-http-unicast', payload: ActivitypubHttpUnicastPayload } |
   { type: 'activitypub-http-fetcher', payload: ActivitypubHttpFetcherPayload } |
+  { type: 'activitypub-follow', payload: ActivitypubFollowPayload } |
   { type: 'video-file', payload: VideoFilePayload } |
   { type: 'email', payload: EmailPayload }
 
@@ -20,6 +22,7 @@ const handlers: { [ id in JobType ]: (job: kue.Job) => Promise<any>} = {
   'activitypub-http-broadcast': processActivityPubHttpBroadcast,
   'activitypub-http-unicast': processActivityPubHttpUnicast,
   'activitypub-http-fetcher': processActivityPubHttpFetcher,
+  'activitypub-follow': processActivityPubFollow,
   'video-file': processVideoFile,
   'email': processEmail
 }
@@ -50,7 +53,7 @@ class JobQueue {
       }
     })
 
-    this.jobQueue.setMaxListeners(15)
+    this.jobQueue.setMaxListeners(20)
 
     this.jobQueue.on('error', err => {
       logger.error('Error in job queue.', { err })