* It now works for users without using sessions.
Sessions should not be cluttered with things
unrelated to authentication and tokens.
* Public services doing api.php requests on behalf
of a users only need to set XFF headers (as normal)
for position wait logic to trigger. They can opt out
of ChronologyProtector via a new HTTP header
"ChronologyProtection: false".
* Requests across subdomains, such as the SUL2 handshake
for CentralAuth on account creation, now have position
wait logic applied. This helps avoid anomolies were a
row just written in the last request may not be seen.
* Use merge() to avoid rolling back master positions if
the user has multiple tabs open and doing writes at once.
* $_SESSION global state is gone from ChronologyProtector.
* Cleaned up post-send LBFactory::shutdown() logic for
avoiding master position writes with an explicit flag.
* Use 'replication' debug log group in more places.
Bug: T111264
Change-Id: Ib25d05994d62b25c2f89e67b7f51009c54f4bca8
LBFactory inherits $wgReadOnly, the LBs inherit
any LBFactory read only mode, and Database objects
inherit any LB read-only mode.
Add some methods callers can use to check if
a DB/LB handle is read-only before trying writes.
Additionally:
* Fix 5ec1e47475 regression where readOnlyBySection
read-only mode would not affect wfReadOnly() but only
lagged-slave read-only mode for LBFactoryMulti.
* Catch errors when getLaggedSlaveMode() is called after
master connection and object is established.
* Make getLaggedSlaveMode() a no-op if there are no slaves.
* Make string/false logic for read-only consistent everywhere.
* Remove mLaggedSlaveMode "m" prefix.
Change-Id: Ice3224caae564aa5ffb41b424c23d1593229117a
* No MediaWiki site can tolerate unbounded slave lag
without editing and account creation and such being
broken and unusable
* Also fix a few trivial __construct() IDEA errors
Change-Id: I95b8b73be2df3b5a87e7adbf53988cfbeb85c260
* wfGetDB( DB_MASTER )->getLBInfo() now shows the master flag
* A corresponding slave flag was also added
* Added a few badly needed LBFactory/LoadBalancer tests
Change-Id: I9254b12cff63af7d754a3a14c5db44276f58d280
