FEATURE: add backup directory for mmdb files

This new `DISCOURSE_MAXMIND_BACKUP_PATH` can be used a secondary location
for maxmind db. That way a build machine, for example can cache it on the
host and reuse between builds.

Also per 5bfeef77 added proper error raising for download fails from
dedicated rake task

This also moves "refresh_maxmind_db_during_precompile_days" to a global
setting, it did not make sense in a site setting

config/discourse_defaults.conf

@@ -208,3 +208,10 @@ max_old_rebakes_per_15_minutes = 300
 # maximum number of log messages in /logs
 max_logster_logs = 1000
 
+# during precompile update maxmind database if older than N days
+# set to 0 to disable
+refresh_maxmind_db_during_precompile_days = 2
+
+# backup path containing maxmind db files
+maxmind_backup_path =
+

config/site_settings.yml

@@ -1534,12 +1534,6 @@ developer:
   enable_safe_mode:
     default: true
     client: true
-  refresh_maxmind_db_during_precompile_days:
-    min: 0
-    max: 120
-    default: 2
-    hidden: true
-    shadowed_by_global: true
 
 embedding:
   feed_polling_enabled:

lib/discourse_ip_info.rb

@@ -27,20 +27,16 @@ class DiscourseIpInfo
   def self.mmdb_download(name)
     FileUtils.mkdir_p(path)
 
-    begin
-      gz_file = FileHelper.download(
-        "https://geolite.maxmind.com/geoip/databases/#{name}/update",
-        max_file_size: 100.megabytes,
-        tmp_file_name: "#{name}.gz"
-      )
+    gz_file = FileHelper.download(
+      "https://geolite.maxmind.com/geoip/databases/#{name}/update",
+      max_file_size: 100.megabytes,
+      tmp_file_name: "#{name}.gz"
+    )
 
-      Discourse::Utils.execute_command("gunzip", gz_file.path)
+    Discourse::Utils.execute_command("gunzip", gz_file.path)
 
-      path = gz_file.path.sub(/\.gz\z/, "")
-      FileUtils.mv(path, mmdb_path(name))
-    rescue OpenURI::HTTPError => e
-      Rails.logger.warn("MaxMindDB (#{name}) could not be downloaded: #{e}")
-    end
+    path = gz_file.path.sub(/\.gz\z/, "")
+    FileUtils.mv(path, mmdb_path(name))
   ensure
     gz_file&.close!
   end

lib/tasks/assets.rake

@@ -158,15 +158,75 @@ def concurrent?
   end
 end
 
+def get_mmdb_time(root_path)
+  mmdb_time = nil
+
+  %w{
+    GeoLite2-City
+    GeoLite2-ASN
+  }.map do |name|
+
+    path = File.join(root_path, "#{name}.mmdb")
+
+    if File.exist?(path)
+      mmdb_time = File.mtime(path)
+    else
+      mmdb_time = nil
+      break
+    end
+  end
+
+  mmdb_time
+end
+
+def copy_maxmind(from_path, to_path)
+  puts "Copying MaxMindDB from #{from_path} to #{to_path}"
+
+  %w{
+    GeoLite2-City
+    GeoLite2-ASN
+  }.each do |name|
+    from = File.join(from_path, "#{name}.mmdb")
+    to = File.join(to_path, "#{name}.mmdb")
+    FileUtils.cp(from, to, preserve: true)
+  end
+end
+
 task 'assets:precompile' => 'assets:precompile:before' do
-  if refresh_days = SiteSetting.refresh_maxmind_db_during_precompile_days
-    mmdb_path = DiscourseIpInfo.mmdb_path('GeoLite2-City')
-    mmdb_time = File.exist?(mmdb_path) && File.mtime(mmdb_path)
+
+  refresh_days = GlobalSetting.refresh_maxmind_db_during_precompile_days
+
+  if refresh_days.to_i > 0
+
+    mmdb_time = get_mmdb_time(DiscourseIpInfo.path)
+
+    backup_mmdb_time =
+      if GlobalSetting.maxmind_backup_path.present?
+        get_mmdb_time(GlobalSetting.maxmind_backup_path)
+      end
+
+    mmdb_time ||= backup_mmdb_time
+    if backup_mmdb_time && backup_mmdb_time >= mmdb_time
+      copy_maxmind(GlobalSetting.maxmind_backup_path, DiscourseIpInfo.path)
+    end
+
     if !mmdb_time || mmdb_time < refresh_days.days.ago
       puts "Downloading MaxMindDB..."
       mmdb_thread = Thread.new do
-        DiscourseIpInfo.mmdb_download('GeoLite2-City')
-        DiscourseIpInfo.mmdb_download('GeoLite2-ASN')
+        begin
+          DiscourseIpInfo.mmdb_download('GeoLite2-City')
+          DiscourseIpInfo.mmdb_download('GeoLite2-ASN')
+
+          if GlobalSetting.maxmind_backup_path.present?
+            copy_maxmind(DiscourseIpInfo.path, GlobalSetting.maxmind_backup_path)
+          end
+
+        rescue OpenURI::HTTPError => e
+          STDERR.puts("*" * 100)
+          STDERR.puts("MaxMindDB (#{name}) could not be downloaded: #{e}")
+          STDERR.puts("*" * 100)
+          Rails.logger.warn("MaxMindDB (#{name}) could not be downloaded: #{e}")
+        end
       end
     end
   end