maintenance: break maintenance tasks into individual jobs.

Break the hourly/daily/weekly/monthly maintenance tasks down into
individual delayed jobs. This way if one task fails, it won't prevent
other tasks from running. Also, jobs can be run in parallel, and can be
individually retried if they fail.

test/jobs/prune_bans_job_test.rb

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+require 'test_helper'
+
+class PruneBansJobTest < ActiveJob::TestCase
+  context "PruneBansJob" do
+    should "prune all expired bans" do
+      @expired_ban = travel_to(1.month.ago) { create(:ban, duration: 1.week) }
+      @unexpired_ban = create(:ban, duration: 1.week)
+
+      assert_equal(true, @expired_ban.user.is_banned?)
+      assert_equal(true, @unexpired_ban.user.is_banned?)
+
+      PruneBansJob.perform_now
+
+      assert_equal(false, @expired_ban.user.reload.is_banned?)
+      assert_equal(true, @unexpired_ban.user.reload.is_banned?)
+    end
+  end
+end

test/jobs/prune_posts_job_test.rb

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+require 'test_helper'
+
+class PrunePostsJobTest < ActiveJob::TestCase
+  context "PrunePostsJob" do
+    should "prune expired posts" do
+      @pending = create(:post, is_pending: true, created_at: 5.days.ago)
+      @flagged = create(:post, is_flagged: true, created_at: 5.days.ago)
+      @appealed = create(:post, is_deleted: true, created_at: 5.days.ago)
+
+      @flag = create(:post_flag, post: @flagged, created_at: 4.days.ago)
+      @appeal = create(:post_appeal, post: @appealed, created_at: 4.days.ago)
+
+      PrunePostsJob.perform_now
+
+      assert_equal(true, @pending.reload.is_deleted?)
+      assert_equal(true, @flagged.reload.is_deleted?)
+      assert_equal(true, @appealed.reload.is_deleted?)
+      assert_equal(true, @flag.reload.succeeded?)
+      assert_equal(true, @appeal.reload.rejected?)
+    end
+  end
+end

test/jobs/prune_rate_limits_job_test.rb

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+require 'test_helper'
+
+class PruneRateLimitsJobTest < ActiveJob::TestCase
+  context "PruneRateLimitsJob" do
+    should "prune all stale rate limits" do
+      travel_to(2.hours.ago) { create(:rate_limit) }
+
+      assert_equal(1, RateLimit.count)
+      PruneRateLimitsJob.perform_now
+      assert_equal(0, RateLimit.count)
+    end
+  end
+end

test/jobs/prune_uploads_job_test.rb

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+require 'test_helper'
+
+class PruneUploadsJobTest < ActiveJob::TestCase
+  context "PruneUploadsJob" do
+    should "prune all old uploads" do
+      @uploader = create(:user)
+
+      as(@uploader) do
+        @completed_upload = travel_to(2.hours.ago) { create(:upload, uploader: @uploader, status: "completed") }
+        @stale_upload = travel_to(2.days.ago) { create(:upload, uploader: @uploader, status: "preprocessed") }
+        @failed_upload = travel_to(4.days.ago) { create(:upload, uploader: @uploader, status: "error") }
+      end
+
+      assert_equal(3, Upload.count)
+      PruneUploadsJob.perform_now
+      assert_equal(0, Upload.count)
+    end
+  end
+end

test/jobs/regenerate_post_counts_job_test.rb

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+require 'test_helper'
+
+class RegeneratePostCountsJobTest < ActiveJob::TestCase
+  context "RegeneratePostCountsJob" do
+    should "regenerate all incorrect tag post counts" do
+      tag1 = create(:tag, name: "touhou", post_count: -10)
+      tag2 = create(:tag, name: "bkub", post_count: 10)
+      tag3 = create(:tag, name: "chen", post_count: 10)
+      post = create(:post, tag_string: "touhou bkub")
+
+      RegeneratePostCountsJob.perform_now
+
+      assert_equal(1, Tag.find_by_name!("touhou").post_count)
+      assert_equal(1, Tag.find_by_name!("bkub").post_count)
+      assert_equal(0, Tag.find_by_name!("chen").post_count)
+    end
+  end
+end