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Renew Cognito credentials on MQTT reconnection #37

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merged 1 commit into from
Jul 5, 2021
Merged

Renew Cognito credentials on MQTT reconnection #37

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17 changes: 17 additions & 0 deletions pysesame3/chsesame2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,22 @@ def _iot_shadow_callback(self, client, userdata, message) -> None: # type: igno
# TODO: handle exceptions correctly
pass

def _iot_on_offline(self) -> None:
"""Callback that gets called when the AWS IoT client is offline.

This is intended to update the credentials before reconnecting.
"""
if not isinstance(self.authenticator, CognitoAuth):
raise NotImplementedError("This feature is not suppoted by the Web API.")
if self._iot_client is None:
raise RuntimeError("subscribeMechStatus is not called yet.")

(access_key_id, secret_key, session_token) = self.authenticator.authenticate()

self._iot_client.configureIAMCredentials(
access_key_id, secret_key, session_token
)

def subscribeMechStatus(
self,
callback: Optional[Callable[["CHSesame2", CHSesame2MechStatus], None]] = None,
Expand Down Expand Up @@ -137,6 +153,7 @@ def subscribeMechStatus(
self._iot_client.configureIAMCredentials(
access_key_id, secret_key, session_token
)
self._iot_client.onOffline = self._iot_on_offline
self._iot_client.connect()
self._iot_client.subscribe(
"$aws/things/sesame2/shadow/name/{}/update/accepted".format(
Expand Down