java.lang.AssertionError · Tried to resolve the auth promise

[mgoforth]

Hi,

First off, thanks for putting this plugin together it really saved me a lot of time with our new ReactNative project!

I'm currently seeing a few cases where the AssertionError is being thrown due to a null Promise in the AuthenticationCallback. I haven't been able to isolate the root cause, but it appears to be somewhat timing related with a cancel() being called.

On Authentication Succeeded:

java.lang.AssertionError Tried to resolve the auth promise, but it was already resolved / rejected. This shouldn't happen. 
    FingerprintModule.java:169 io.jari.fingerprint.FingerprintModule$AuthenticationCallback.onAuthenticationSucceeded
    FingerprintManagerCompat.java:301 android.support.v4.hardware.fingerprint.FingerprintManagerCompat$Api23FingerprintManagerCompatImpl$1.onAuthenticationSucceeded
    FingerprintManagerCompatApi23.java:114 android.support.v4.hardware.fingerprint.FingerprintManagerCompatApi23$1.onAuthenticationSucceeded
    FingerprintManager.java:1165 android.hardware.fingerprint.FingerprintManager$MyHandler.sendAuthenticatedSucceeded
    FingerprintManager.java:1096 android.hardware.fingerprint.FingerprintManager$MyHandler.handleMessage
    Handler.java:102 android.os.Handler.dispatchMessage
    Looper.java:154 android.os.Looper.loop
    ActivityThread.java:6688 android.app.ActivityThread.main
    Method.java:-2 java.lang.reflect.Method.invoke
    ZygoteInit.java:1468 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
    ZygoteInit.java:1358 com.android.internal.os.ZygoteInit.main

On Authentication Error:

java.lang.AssertionError Tried to reject the auth promise, but it was already resolved / rejected. This shouldn't happen. 
    FingerprintModule.java:147 io.jari.fingerprint.FingerprintModule$AuthenticationCallback.onAuthenticationError
    FingerprintManagerCompat.java:290 android.support.v4.hardware.fingerprint.FingerprintManagerCompat$Api23FingerprintManagerCompatImpl$1.onAuthenticationError
    FingerprintManagerCompatApi23.java:104 android.support.v4.hardware.fingerprint.FingerprintManagerCompatApi23$1.onAuthenticationError
    FingerprintManager.java:1136 android.hardware.fingerprint.FingerprintManager$MyHandler.sendErrorResult
    FingerprintManager.java:1102 android.hardware.fingerprint.FingerprintManager$MyHandler.handleMessage
    Handler.java:102 android.os.Handler.dispatchMessage
    Looper.java:154 android.os.Looper.loop
    ActivityThread.java:6688 android.app.ActivityThread.main
    Method.java:-2 java.lang.reflect.Method.invoke
    ZygoteInit.java:1468 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
    ZygoteInit.java:1358 com.android.internal.os.ZygoteInit.main

I know the Android Fingerprint documentation specifically mentions that after the onAuthenticationError callback executes no other callbacks should be called, but either that isn't true 100% of the time or there may be a currency issue of some kind. Regardless, would you consider downgrading the thrown AssertionError to log a warning instead? This would prevent a full application crash in these situations and shouldn't affect the existing JavaScript API since the Promise has already been resolved/rejected.

[jariz]

This is now 'fixed' by logging to console instead of throwing an error (#20), I'm gonna leave this issue open though, as the underlying issue has not been fixed as of yet (which is it getting called multiple times in the first place)