+
+# This uses a pair of apps to get a seamless upgrades. ie the site is never
+# down, and connections that are open at the time of upgrade are given 10
+# seconds to close.
+#
+# Requirements:
+#
+# 1. There must be two apps with the same name except one has an underscore at
+# the end and the other doesn't.
+#
+# 2. One of these apps must be running, and must have the domain names mapped
+# to it.
+#
+# 3. The other must be stopped, and must not have the domain names mapped to
+# it. (just it's *.af.com address.)
+#
+# For now, pass only the name of the app which is currently stopped.
+commands.app_publish_seamless = (token, app_name, zip_file, callback) ->
+ # FIXME auto-detect which one is new by checking app_info.urls.length
+ # (should happen for all api calls?)
+ #
+ # for now, we assume that the passed app_name is the currently dormant one
+ if app_name.substr(-1) is '_'
+ old_app = app_name.substr 0, app_name.length - 1
+ new_app = app_name
+ else
+ old_app = app_name + '_'
+ new_app = app_name
+
+ async.auto {
+ push: (cb) => @api 'app_update_files', new_app, zip_file, cb
+ # TODO find out if app_update_files increments app_info.version
+ # if not, drop new_info's dependency on push
+ old_info: (cb) => @api 'app_info', old_app, cb
+ new_info: ['push', (cb) => @api 'app_info', new_app, cb ]
+ start_new: ['push', 'old_info', 'new_info', (cb, args) =>
+ args.new_info.state = 'STARTED'
+ for u in args.old_info.uris
+ args.new_info.uris.push u unless u.substr(-6) is '.af.cm'
+ @api 'app_set_info', new_app, args.new_info, cb
+ ]
+ hide_old: ['start_new', 'old_info', (cb, args) =>
+ just_af = []
+ for u in args.old_info.uris
+ just_af.push u if u.substr(-6) is '.af.cm'
+ args.old_info.uris = just_af
+ @api 'app_set_info', old_app, args.old_info, cb
+ ]
+ wait_for_old_connections: ['hide_old', (cb) =>
+ seconds = 10
+ log_id = @log_start "waiting #{seconds} seconds for connections to old instance to finish"
+ timeout seconds * 1000, =>
+ @log_end(log_id)
+ cb()
+ ]
+ old_info_again: ['hide_old', (cb) =>
+ @api 'app_info', old_app, cb
+ ]
+ stop_old: ['wait_for_old_connections', 'old_info_again', (cb, args) =>
+ args.old_info_again.state = 'STOPPED'
+ @api 'app_set_info', old_app, args.old_info_again, cb
+ ]
+ # TODO when we get into sending manifests, we may need to update_files to old_app too
+ }, callback
+