Domain block service cleanup (#2490)

* Add coverage for domain block service with silence

* Get rid of warning about find_each and order

* Move domain_block to attr_reader

* Move optional clear_media into silence_accounts method

* Use blocked_domain method to reduce passed vars

* Extract blocked_domain_accounts method to find accounts on the domain

* Extract media_from_blocked_domain method to find relevant attachments

* Separate destruction of account images and account attachments

app/services/block_domain_service.rb

 # frozen_string_literal: true
 
 class BlockDomainService < BaseService
+  attr_reader :domain_block
+
   def call(domain_block)
+    @domain_block = domain_block
+    process_domain_block
+  end
+
+  private
+
+  def process_domain_block
     if domain_block.silence?
-      silence_accounts!(domain_block.domain)
-      clear_media!(domain_block.domain) if domain_block.reject_media?
+      silence_accounts!
     else
-      suspend_accounts!(domain_block.domain)
+      suspend_accounts!
     end
   end
 
-  private
+  def silence_accounts!
+    blocked_domain_accounts.update_all(silenced: true)
+    clear_media! if domain_block.reject_media?
+  end
 
-  def silence_accounts!(domain)
-    Account.where(domain: domain).update_all(silenced: true)
+  def clear_media!
+    clear_account_images
+    clear_account_attachments
+  end
+
+  def suspend_accounts!
+    blocked_domain_accounts.where(suspended: false).find_each do |account|
+      account.subscription(api_subscription_url(account.id)).unsubscribe if account.subscribed?
+      SuspendAccountService.new.call(account)
+    end
   end
 
-  def clear_media!(domain)
-    Account.where(domain: domain).find_each do |account|
+  def clear_account_images
+    blocked_domain_accounts.find_each do |account|
       account.avatar.destroy
       account.header.destroy
     end
+  end
 
-    MediaAttachment.where(account: Account.where(domain: domain)).find_each do |attachment|
+  def clear_account_attachments
+    media_from_blocked_domain.find_each do |attachment|
       attachment.file.destroy
     end
   end
 
-  def suspend_accounts!(domain)
-    Account.where(domain: domain).where(suspended: false).find_each do |account|
-      account.subscription(api_subscription_url(account.id)).unsubscribe if account.subscribed?
-      SuspendAccountService.new.call(account)
-    end
+  def blocked_domain
+    domain_block.domain
+  end
+
+  def blocked_domain_accounts
+    Account.where(domain: blocked_domain)
+  end
+
+  def media_from_blocked_domain
+    MediaAttachment.where(account: blocked_domain_accounts).reorder(nil)
   end
 end

spec/services/block_domain_service_spec.rb

@@ -13,21 +13,46 @@ RSpec.describe BlockDomainService do
     bad_status1
     bad_status2
     bad_attachment
-
-    subject.call(DomainBlock.create!(domain: 'evil.org', severity: :suspend))
   end
 
-  it 'creates a domain block' do
-    expect(DomainBlock.blocked?('evil.org')).to be true
-  end
+  describe 'for a suspension' do
+    before do
+      subject.call(DomainBlock.create!(domain: 'evil.org', severity: :suspend))
+    end
+
+    it 'creates a domain block' do
+      expect(DomainBlock.blocked?('evil.org')).to be true
+    end
+
+    it 'removes remote accounts from that domain' do
+      expect(Account.find_remote('badguy666', 'evil.org').suspended?).to be true
+    end
 
-  it 'removes remote accounts from that domain' do
-    expect(Account.find_remote('badguy666', 'evil.org').suspended?).to be true
+    it 'removes the remote accounts\'s statuses and media attachments' do
+      expect { bad_status1.reload }.to raise_exception ActiveRecord::RecordNotFound
+      expect { bad_status2.reload }.to raise_exception ActiveRecord::RecordNotFound
+      expect { bad_attachment.reload }.to raise_exception ActiveRecord::RecordNotFound
+    end
   end
 
-  it 'removes the remote accounts\'s statuses and media attachments' do
-    expect { bad_status1.reload }.to raise_exception ActiveRecord::RecordNotFound
-    expect { bad_status2.reload }.to raise_exception ActiveRecord::RecordNotFound
-    expect { bad_attachment.reload }.to raise_exception ActiveRecord::RecordNotFound
+  describe 'for a silence with reject media' do
+    before do
+      subject.call(DomainBlock.create!(domain: 'evil.org', severity: :silence, reject_media: true))
+    end
+
+    it 'does not create a domain block' do
+      expect(DomainBlock.blocked?('evil.org')).to be false
+    end
+
+    it 'silences remote accounts from that domain' do
+      expect(Account.find_remote('badguy666', 'evil.org').silenced?).to be true
+    end
+
+    it 'leaves the domains status and attachements, but clears media' do
+      expect { bad_status1.reload }.not_to raise_error
+      expect { bad_status2.reload }.not_to raise_error
+      expect { bad_attachment.reload }.not_to raise_error
+      expect(bad_attachment.file.exists?).to be false
+    end
   end
 end