Change delivery failure tracking to work with hostnames instead of URLs (#13437)

db/migrate/20200407201300_create_unavailable_domains.rb

@@ -0,0 +1,9 @@
+class CreateUnavailableDomains < ActiveRecord::Migration[5.2]
+  def change
+    create_table :unavailable_domains do |t|
+      t.string :domain, default: '', null: false, index: { unique: true }
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20200407202420_migrate_unavailable_inboxes.rb

@@ -0,0 +1,16 @@
+class MigrateUnavailableInboxes < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    urls = Redis.current.smembers('unavailable_inboxes')
+
+    urls.each do |url|
+      host = Addressable::URI.parse(url).normalized_host
+      UnavailableDomain.create(domain: host)
+    end
+
+    Redis.current.del(*(['unavailable_inboxes'] + Redis.current.keys('exhausted_deliveries:*')))
+  end
+
+  def down; end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_03_12_185443) do
+ActiveRecord::Schema.define(version: 2020_04_07_202420) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -769,6 +769,13 @@ ActiveRecord::Schema.define(version: 2020_03_12_185443) do
     t.index ["uri"], name: "index_tombstones_on_uri"
   end
 
+  create_table "unavailable_domains", force: :cascade do |t|
+    t.string "domain", default: "", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["domain"], name: "index_unavailable_domains_on_domain", unique: true
+  end
+
   create_table "user_invite_requests", force: :cascade do |t|
     t.bigint "user_id"
     t.text "text"