commit bd23a7da105d635414643dfcedd9c8f710d565b8
Author: Evan Prodromou <evan@e14n.com>
Date: Sat Jun 29 07:49:03 2013 -0400
Make the after flag work correctly
commit 5c5845a2f866f0bbffedd8e2e5d1f512f87d5329
Author: Evan Prodromou <evan@e14n.com>
Date: Sat Jun 29 06:14:43 2013 -0400
Add an 'after' flag for backup script
UserActivityStream -- used to create a full activity stream including subscriptions, favorites, notices, etc -- normally buffers everything into memory at once. This is infeasible for accounts with long histories of serious usage; it can take tens of seconds just to pull all records from the database, and working with them all in memory is very likely to hit resource limits.
This commit adds an alternate mode for this class which avoids pulling notices until during the actual output. Instead of pre-sorting and buffering all the notices, empty spaces between the other activities are filled in with notices as we're making output. This means more smaller queries spread out during operations, and less stuff kept in memory.
Callers (backupaccount action, and backupuser.php) which can stream their output pass an $outputMode param of UserActivityStream::OUTPUT_RAW, and during getString() it'll send straight to output as well as slurping the notices in this extra funky fashion.
Other callers will let it default to the OUTPUT_STRING mode, which keeps the previous behavior.
There should be a better way to do this, swapping out the stringer output for raw output more consitently.
