feat: Add optional non blocking refresh for sync auth code by clundin25 · Pull Request #1368 · googleapis/google-auth-library-python

clundin25 · 2023-08-11T21:58:17Z

No description provided.

sai-sunder-s · 2023-09-13T17:45:46Z

google/auth/credentials.py

+        if not self.expiry:
+            return TokenState.FRESH
+
+        refresh_window = _helpers.utcnow() >= (self.expiry - _helpers.REFRESH_THRESHOLD)


rename this variable to something like is_fresh?

sai-sunder-s · 2023-09-13T17:47:30Z

google/auth/credentials.py

+                self.refresh(request)
+
+        if self.token_state == TokenState.INVALID:
            self.refresh(request)


Multiple requests may end up doing this refresh right?
Can we have a lock on this sync refresh?

The code is using a bounded queue which should reduce duplicate work. There is a risk that there is a small amount of duplicate work, if two threads queue work at the same time. The queue itself is thread safe + has locks.

I believe using the queue to reduce duplicate work is acceptable, and that multiple threads will perform the refresh occasionally.

There should be no data corruption due to this

…ptive-refresh

google/auth/_refresh_worker.py

google/auth/credentials.py

google/auth/_refresh_worker.py

westarle · 2023-12-15T19:28:31Z

google/auth/credentials.py

+    def with_non_blocking_refresh(self):
+        self._use_non_blocking_refresh = True
+
+    def get_background_refresh_error(self):


I think I would prefer to remove this from the public API:

it is not relevant without the feature flag

it isn't clear when you'd want to call it

it's hard to implement safely

westarle · 2023-12-15T19:29:05Z

google/auth/credentials.py

+class TokenState(Enum):
+    """
+    Tracks the state of a token.
+    FRESH: The token is valid. It is not expired or close to expired, or the token has no expiry. To make it mutually exclusive to STALE.


sorry about this: the "To make it mutually exclusive to STALE" part wasn't meant to be part of the comment.

westarle · 2023-12-15T19:40:15Z

google/auth/_refresh_worker.py

+                # rety this error.
+                err, self._worker._error_info = self._worker._error_info, None
+
+                raise e.RefreshError(


this has a kind of weird 'every 2nd call fails' pattern that doesn't seem quite right.

I would suggest we try to background refresh once, log and record the error, then do foreground refreshes from then on until we get a new token.

You might return false from start_refresh to cause the caller to call refresh on their own thread. The caller would be responsible for calling "clear error" any time they have a good token from refresh().

Sounds good!

westarle · 2023-12-15T19:41:27Z

google/auth/_refresh_worker.py

+                self._worker = RefreshThread(cred=cred, request=request)
+                self._worker.start()
+
+    def has_error(self):


I would remove this and get_error from the public API since they are subject to the lock and difficult to reason about outside of this class.

Okay that sounds good!

westarle · 2023-12-15T19:54:05Z

google/auth/credentials.py

+            self.refresh(request)
+
+    def _non_blocking_refresh(self, request):
+        if (


following the comment above, this would become:

if self.token_state == TokenState.FRESH: return need_refresh = True if self.token_state == TokenState.STALE: need_refresh = not self.refresh_worker.start_refresh(self, request) if need_refresh: self.refresh(request) self._refresh_worker.clear_error()

Done! I kept the INVALID case, should a refresh was never called in the STALE state.

westarle · 2023-12-15T19:57:41Z

google/auth/_refresh_worker.py

+        self._worker = None
+        self._lock = threading.Lock()  # protects access to worker threads.
+
+    def start_refresh(self, cred, request):


is request immutable or can we create a copy here?

Can you expand on why copy it? I don't think it is necessary, as the request should not be re-used in other places.

I think copying the request would be a breaking change.

I'd have to do some work to understand the implication of deep copying a request object.

google/auth/_refresh_worker.py

google/auth/credentials.py

clundin25 requested review from arithmetic1728 and sai-sunder-s August 11, 2023 21:59

clundin25 force-pushed the pre-emptive-refresh branch from 6dffc03 to b244471 Compare September 12, 2023 17:36

clundin25 marked this pull request as ready for review September 12, 2023 17:36

clundin25 requested review from a team September 12, 2023 17:36

clundin25 requested a review from a team as a code owner September 12, 2023 17:36

sai-sunder-s reviewed Sep 13, 2023

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clundin25 added 5 commits November 9, 2023 12:35

feat: Add optional non blocking refresh for sync auth code

a07551f

Rename refresh_window to is_stale.

20f8ec4

Add API to get background refresh errors.

377e19c

Apply error handling feedback.

31e2f33

chore: Refresh system test creds.

aab77bb

clundin25 force-pushed the pre-emptive-refresh branch from d99a734 to aab77bb Compare November 9, 2023 20:36

clundin25 added 5 commits November 9, 2023 13:12

Fix linter.

1848c2a

No cover issue.

8d741d5

Fix coverage test.

20941ed

Fix linter.

3ca4b97

chore: Refresh system test creds.

c7b11f8

clundin25 added the owlbot:run Add this label to trigger the Owlbot post processor. label Nov 10, 2023

gcf-owl-bot bot removed the owlbot:run Add this label to trigger the Owlbot post processor. label Nov 10, 2023

Fixed linter error.

0417312

BigTailWolf approved these changes Nov 13, 2023

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BigTailWolf and others added 5 commits November 13, 2023 10:27

Merge branch 'main' into pre-emptive-refresh

64e1c7c

Fix coverage test.

b94d6e1

Add no cover.

88c00e1

Merge remote-tracking branch 'origin/pre-emptive-refresh' into pre-em…

e2623f4

…ptive-refresh

chore: Refresh system test creds.

b5281bd

clundin25 added 6 commits December 13, 2023 17:04

PR feedback.

a19fe0d

Merge remote-tracking branch 'upstream/main' into pre-emptive-refresh

0e35c67

chore: Refresh system test creds.

f0b218e

Fix lint

a6b1815

Use field to store error in RefreshThread.

df7220c

Remove some left over constants. Combine locks.

89ceeeb

westarle reviewed Dec 14, 2023

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clundin25 added 4 commits December 14, 2023 10:53

PR feedback.

41042c2

Remove exception deadlock

f557447

Don't try to refresh stale tokens that have an active error.

4cecc4a

Fix cover check and logic error on has_error()

be2e2da

clundin25 added the owlbot:run Add this label to trigger the Owlbot post processor. label Dec 14, 2023

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clundin25 requested a review from westarle December 15, 2023 18:00

westarle reviewed Dec 15, 2023

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PR feedback.

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clundin25 requested a review from westarle December 15, 2023 22:38

Deep copy request object when starting background refresh.

f5e77e5

westarle approved these changes Dec 18, 2023

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PR feedback.

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clundin25 added the owlbot:run Add this label to trigger the Owlbot post processor. label Dec 18, 2023

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Merge remote-tracking branch 'upstream/main' into pre-emptive-refresh

fcf1f8a

clundin25 added the owlbot:run Add this label to trigger the Owlbot post processor. label Dec 18, 2023

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clundin25 merged commit a6dc2c3 into googleapis:main Dec 18, 2023

release-please bot mentioned this pull request Dec 15, 2023

chore(main): release 2.26.0 #1442

Merged

jackwotherspoon mentioned this pull request Mar 24, 2024

Token refresh uses blocking I/O in async function GoogleCloudPlatform/alloydb-python-connector#245

Closed

clundin25 mentioned this pull request Apr 19, 2024

Implement pre-emptive credential refresh googleapis/google-cloud-python#15200

Open

dbalabka mentioned this pull request Jun 27, 2024

Remove deprecated property usage fsspec/gcsfs#628

Open

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clundin25 commented Aug 11, 2023

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5 participants