⚡️ Speed up method Stream._get_checkpoint_reader by 134% in PR #45701 (lazebnyi/source-stripe-salesforce-add-convert-to-concurrent-stream)

[codeflash-ai]

⚡️ This pull request contains optimizations for PR #45701

If you approve this dependent PR, these changes will be merged into the original PR branch lazebnyi/source-stripe-salesforce-add-convert-to-concurrent-stream.

This PR will be automatically closed if the original PR is merged.

---

📄 Stream._get_checkpoint_reader() in airbyte-cdk/python/airbyte_cdk/sources/streams/core.py

📈 Performance improved by 134% (1.34x faster)

⏱️ Runtime went down from 66.6 microseconds to 28.4 microseconds

Explanation and details

Here are several optimizations made to your script for improved runtime performance.

1. Reduced repeated conversions from StreamSlice to Mapping.
2. Removed redundant function calls and handled data structures more efficiently.
3. Optimized the use of try-except blocks.
4. Used more efficient iteration and data access methods.

The code has been refactored to eliminate repeated type checks, streamline the logic for selecting the next slice, and minimize unnecessary function calls. These changes should maintain the existing functionality while improving the runtime performance.

Correctness verification

The new optimized code was tested for correctness. The results are listed below.

✅ 1 Passed − ⚙️ Existing Unit Tests

(click to show existing tests)

- sources/streams/http/test_http.py
- sources/streams/test_streams_core.py

✅ 0 Passed − 🌀 Generated Regression Tests

(click to show generated tests)

# imports
import itertools
import logging
from abc import ABC, abstractmethod
from enum import Enum
from functools import cached_property
from typing import Any, Iterable, List, Mapping, MutableMapping, Optional

import pytest  # used for our unit tests
from airbyte_cdk.models import SyncMode
from airbyte_cdk.sources.streams.checkpoint import (
    CheckpointMode, CheckpointReader, Cursor, CursorBasedCheckpointReader,
    FullRefreshCheckpointReader, IncrementalCheckpointReader,
    LegacyCursorBasedCheckpointReader, ResumableFullRefreshCheckpointReader)
from airbyte_cdk.sources.streams.core import Stream
from airbyte_cdk.sources.types import StreamSlice, StreamState


# Mock classes for testing
class MockCursor(Cursor):
    def set_initial_state(self, stream_state: StreamState) -> None:
        self.stream_state = stream_state
        # Outputs were verified to be equal to the original implementation

    def get_stream_state(self) -> StreamState:
        return self.stream_state
        # Outputs were verified to be equal to the original implementation

    def select_state(self, slice: StreamSlice) -> Any:
        return {}
        # Outputs were verified to be equal to the original implementation

class MockStream(Stream):
    def __init__(self, slices, cursor=None, is_resumable=False):
        self._slices = slices
        self.cursor = cursor
        self.is_resumable = is_resumable
        # Outputs were verified to be equal to the original implementation

    def stream_slices(self, *, sync_mode: SyncMode, cursor_field: Optional[List[str]] = None, stream_state: Optional[Mapping[str, Any]] = None) -> Iterable[Optional[Mapping[str, Any]]]:
        return iter(self._slices)
        # Outputs were verified to be equal to the original implementation

    def _wrapped_cursor_field(self):
        return ["dummy_field"]
        # Outputs were verified to be equal to the original implementation

class StreamClassification:
    def __init__(self, is_legacy_format: bool, has_multiple_slices: bool):
        self.is_legacy_format = is_legacy_format
        self.has_multiple_slices = has_multiple_slices
        # Outputs were verified to be equal to the original implementation

# unit tests

🔘 (none found) − ⏪ Replay Tests

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