[Port of https://github.com/firebase/firebase-js-sdk/commit/0fa319e5e019dd0d40ab441d2ff9f8f6d4724e43]
* Refactored FSTOnlineState tracking out of FSTRemoteStore and into new
FSTOnlineStateTracker component.
* Added a 10 second timeout to transition from OnlineState.Unknown to
OnlineState.Offline rather than waiting indefinitely for the stream to
succeed or fail.
* Removed hack to run SpecTests using an FSTDispatchQueue that wrapped
dispatch_get_main_queue(). This was incompatible with [FSTDispatchQueue
runDelayedCallbacksUntil:] since it queues work and blocks waiting for
it to complete. Now spec tests create / use a proper FSTDispatchQueue.
* Added a SpecTest to verify OnlineState timeout behavior.
* Misc cleanup:
* Renamed FSTOnlineState states: Failed => Offline, Healthy => Online
* Renamed FSTTimerIds (ListenStreamConnection => ListenStreamConnectionBackoff)
* Added ability to run timers from spec tests.
* lazy replacing FST(Firebase)CredentialsProvider by (Firebase)CredentialsProvider
* lazy replacing FSTUser by User
* adding error-code parameter to TokenListener
* actually use const user& instead of pointer; also add an error util
* add HashUser and pass into the unordered_map
* use User in test
* use c++ CredentialsProvider and subclass in test
* fix unit test
* use explicit capture in lambda instead of capture all by reference
* cache currentUser explicitly when reset sync engineer test driver
* objc object should be captured by value in lambda
* replacing Auth/FSTUser by C++ auth implementation
* address changes
* replacing FSTGetTokenResult by C++ Token implementation
* address changes
* fix unintentional change in merging
* patch the change in objc Auth up-stream
* somehow, the lambda-version of set-user-change-listener does not work... fallback to block
* address changes
* fix another const& v.s. dispatch bug
* fix more const& v.s. dispatch bug zxu123 committed
* fix a bad sync line
* address changes
* address change
* address change
* fix upstream change from merge
* fix upstream changes
* Suggested fixes for cpp/port_auth (#846)
* Get rid of MockDatastore factory
This avoids the need to statically allocate (and leak) a credentials
provider
* Use absl::make_unique
std::make_unique technically does not exist until C++14.
* #include <utility> for std::move
* Use std::future for the initial user
* fix style
* Move all Firestore files to Objective-C++
* Update project file references
* Don't use module imports from Objective-C++
* Use extern "C" for C-accessible globals
* Work around more stringent type checking in Objective-C++
* NSMutableDictionary ivars aren't implicitly casted to NSDictionary
* FSTMaybeDocument callback can't be passed a function that accepts
FSTDocument
* NSComparisonResult can't be multiplied by -1 without casting
* Add a #include <inttypes.h> where needed
* Avoid using C++ keywords as variables
* Remove #if __cplusplus guards
Michael Lehenbauer