Before, when anything but the exact correct Login URI was entered, the
user would either get no error, or a pop up saying "Cannot retrieve grid
info from server."
With this patch, that pop up includes what went wrong and stresses that
they check if they entered the correct Login URI and where to find it.
I was motivated to write this after looking at crash report 8405 where
a user who had downloaded Singularity for the very first time crashed
twice when entering things like "aviworlds" and " aviworlds.com:8002"
(not the space), and "http:aviworlds.com:8002" (missing '//').
Especially in the light of FS accepting Login URI without the 'http://',
a lot of grid websites (like that of aviworlds) might instruct users
to enter the url without http://. Ie, this user was told to enter
just "aviworlds.com:8002", and when that failed was instructed to
add 'http' in front of it...
Now the code accepts also really WEIRD things, but will never mess
up a good entry. For example, if you enter "pssshht:aviworlds.com:8002"
then that will work, as a side effect. The real objective however is
of course to let things work like: "aviworlds.com:8002 ",
"http:aviworlds.com:8002", " http:/aviworlds.com:8002", and to give
a usable error message when there is a typo in the hostname (Cannot
resolve hostname) or they forget to add a port number (404, or
connection refused), plus the text "Make sure you entered the correct
Login URI. An example of a Login URI is: \"http://cool.grid.com:8002/\",
this url can usually be found on the website of the grid."
Blocking http requests (code using responders derived from
BlockingResponder) *do* call getRaw() and getLLSD to get the body of
server error messages. It is therefore perfectly ok if mStatus !=
HTTP_OK.
This fixes at least one case (crash report 8407), which comes
down to not cleanly informing a responder of failure when the
request url is empty (or so badly formed that it isn't a valid
url). As a result, the statemachine would abort() without
informing the responder - which is bad, sort of.
The previous cases where the responder needed to be informed
of a failure, namely "statemachine timed_out()" and "bad_socket()"
when a socket suddenly becomes bad for unknown reason, have been
replaced with the more general 'aborted()' function, which must
be called before the statemachine calls abort(). Clearly this
has been done for all cases of abort() now, so that if the
llerrs fires again in the future then that would have to be
after the statemachine calls finish(), which is still as "impossible"
as it was - hence the llerrs is still there to make sure.
The reason that this seldom happened on SL, and more often on
opensim, even more often on home-brew test grids, seems plausible:
malformed urls happen more in those cases.
I also took the opportunity to improve the robustness of cases
where the curl error code is checked: it makes no sense to check
what curl gives as error code when an internal error occurred.
This makes LLStringUtil thread-safe by removing a rather unnecessary
LLFastTimer from LLStringUtil::format.
Same thing for LLTrans::getString and LLTrans::findString, where
even a comment stated that the author wasn't interested in measuring
cpu time at all. In this case I added some code back to make sure
that we're not calling LLTrans::getString() in an inner loop, which
was the reason that the LLFastTimer was added.
Made one string static to avoid 45000 look ups during login, which
kinda triggered the above test.
Finally, LLNotificationsUtil::add is made thread-safe by making
LLNotificationChannelBase::mItems thread-safe and defering a call
to LLNotifications::updateItem to the main thread when called
from another thread (using a little statemachine).
