refactor(retry): migrate from backoff to tenacity

[Kevin James (TheKevJames)]

Summary

backoff is now abandoned and starting to throw errors in newer Python
versions (see #999), so we need to consider an alternative. After playing with
tenacity and stamina, and evaluating a few others, it seems like tenacity is
a pretty nice fit it terms of useability vs simplicity and slotting into our
system.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the retry mechanism across the codebase, replacing the backoff library with tenacity. This change addresses the abandonment of backoff and its compatibility issues with newer Python versions, ensuring a more robust and maintainable retry strategy. The migration involved updating dependency configurations, modifying code to use tenacity's decorator-based retry patterns, and updating relevant documentation.

Highlights

• Retry Library Migration: The backoff library, which is no longer maintained and causes issues with newer Python versions, has been replaced with the tenacity library for implementing retry logic across the codebase.
• Dependency Updates: Project dependencies and lock files (.pre-commit-config.yaml, poetry.lock, pyproject.toml) have been updated to remove backoff and include tenacity.
• Code Refactoring: Existing retry implementations using backoff.on_exception and backoff.on_predicate have been refactored to use tenacity's @retry decorator, ensuring equivalent retry behavior.
• Documentation Refresh: Documentation examples in pubsub and storage modules have been updated to demonstrate retry policy configuration using tenacity.

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Changelog

• .pre-commit-config.yaml
  • Updated pre-commit hook dependencies to replace 'backoff' with 'tenacity'.
• auth/gcloud/aio/auth/token.py
  • Removed 'backoff' imports.
  • Added 'tenacity' imports for 'retry', 'retry_if_exception_type', 'stop_after_attempt', and 'wait_random_exponential'.
  • Replaced '@backoff.on_exception' decorator with 'Retry' for 'acquire_access_token' method, configuring it with equivalent retry logic.
• auth/poetry.lock
  • Removed 'backoff' package entry.
  • Added 'tenacity' package entry with version '9.1.4'.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Updated poetry lock file header to '2.3.2'.
  • Updated content hash.
• auth/pyproject.rest.toml
  • Replaced 'backoff' dependency with 'tenacity'.
• auth/pyproject.toml
  • Replaced 'backoff' dependency with 'tenacity'.
• bigquery/poetry.lock
  • Updated poetry lock file header to '2.3.2'.
  • Removed 'backoff' package entry.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.
• bigquery/tests/integration/smoke_test.py
  • Removed 'backoff' imports.
  • Added 'tenacity' imports for various retry components.
  • Refactored 'backoff.on_predicate' and 'backoff.on_exception' calls into 'Retry' decorated async helper functions for 'get_datastore_operation', 'get_source_table', and 'get_copy_table'.
• datastore/poetry.lock
  • Updated poetry lock file header to '2.3.2'.
  • Removed 'backoff' package entry.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.
• kms/poetry.lock
  • Updated poetry lock file header to '2.3.2'.
  • Removed 'backoff' package entry.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.
• pubsub/gcloud/aio/pubsub/init.py
  • Updated documentation example for retry policies to use 'tenacity' instead of 'backoff'.
  • Changed class name in example from 'SubscriberClientWithBackoff' to 'SubscriberClientWithRetry'.
  • Updated 'backoff' reference link to 'tenacity'.
• pubsub/poetry.lock
  • Updated poetry lock file header to '2.3.2'.
  • Removed 'backoff' package entry.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.
• storage/gcloud/aio/storage/init.py
  • Updated documentation examples for retry policies to use 'tenacity' instead of 'backoff'.
  • Changed class name in example from 'StorageWithBackoff' to 'StorageWithRetry'.
  • Updated 'backoff' reference link to 'tenacity'.
• storage/poetry.lock
  • Removed 'backoff' package entry.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.
• taskqueue/poetry.lock
  • Updated poetry lock file header to '2.3.2'.
  • Removed 'backoff' package entry.
  • Updated 'gcloud-aio-auth' version to '5.4.4'.
  • Updated 'chardet' version to '>= 2.0, < 7.0'.
  • Added 'tenacity' package entry with version '9.1.4'.

Activity

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[gemini-code-assist]

Code Review

This pull request successfully migrates the project's retry logic from the abandoned backoff library to tenacity. The changes span across dependency configurations, application code, test files, and documentation, ensuring a consistent and necessary update. The migration to tenacity is well-executed, with retry policies correctly translated. I've included a couple of suggestions to refactor duplicated retry logic in a test file for improved maintainability and conciseness.