That gives us enough guarantees that we can simplify the error-handling
code.
We also ensure that the "new connection" handler in livedata_server runs
in a Fiber, which fixes a bug introduced in d049bf7506 where connections
from pre-pre1 clients would crash (due to Meteor.setTimeout which only
works in a Fiber).
be modified by hook callbacks.
Give the Hook constructor a named option to debug print and ignore
exceptions, as just passing in a string argument to do that wasn't
very clear.
Adds `Accounts.validateLoginAttempt`, `Accounts.onLogin`, and
`Accounts.onLoginFailure`.
The process for logging in a user is consolidated in accounts-base,
which is now the only package which directly accesses login tokens in
the database.
All login methods now go through `Accounts._loginMethod`, which
ensures that exceptions are captured and login hooks are called in all
cases.
The callback hook implementation code from livedata is extracted into
an internal `callback-hook` package, where it can be used by accounts.
