⚡️ Speed up method BookStackDataSource.delete_shelf by 7%

[codeflash-ai]

📄 7% (0.07x) speedup for BookStackDataSource.delete_shelf in backend/python/app/sources/external/bookstack/bookstack.py

⏱️ Runtime : 2.50 milliseconds → 2.33 milliseconds (best of 272 runs)

📝 Explanation and details

The optimized code achieves a 7% runtime improvement and 0.7% throughput improvement through three key micro-optimizations:

Key Optimizations:

1. Efficient Header Merging in HTTPClient: Replaced {**self.headers, **request.headers} with self.headers.copy() followed by update(request.headers). This eliminates the overhead of dictionary unpacking and reconstruction, reducing memory allocation.

2. Direct Header Reference in BookStackDataSource: Removed unnecessary dict(self.http.headers) wrapper and directly passed self.http.headers to HTTPRequest. This eliminates redundant dictionary copying since the headers dict is stable and not mutated per request.

3. Eliminated Unused Variable Allocation: Removed the unused params: Dict[str, Union[str, int]] = {} variable and directly passed an empty dict {} to query_params, avoiding unnecessary memory allocation.

4. f-string URL Construction: Replaced .format() method with f-string for URL construction, which is slightly more efficient in Python.

Why These Optimizations Work:

• Dictionary operations are optimized in the critical path where headers are processed for every HTTP request
• Eliminating redundant allocations reduces memory pressure and GC overhead
• f-strings have less method call overhead compared to .format()

Best Performance Gains For:
Based on the test results, these optimizations are most effective for high-throughput scenarios with many concurrent requests (throughput tests with 50-200 operations), where the cumulative effect of reduced memory allocations and faster header processing becomes measurable. The improvements are consistent across both success and failure cases.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 618 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import asyncio  # used to run async functions
from typing import Dict, Union

import pytest  # used for our unit tests
from app.sources.external.bookstack.bookstack import BookStackDataSource

# --- Minimal stubs and helpers for dependencies ---

# HTTPRequest stub
class HTTPRequest:
    def __init__(self, method, url, headers, query_params, body):
        self.method = method
        self.url = url
        self.headers = headers
        self.query_params = query_params
        self.body = body

# BookStackResponse stub
class BookStackResponse:
    def __init__(self, success: bool, data=None, error=None):
        self.success = success
        self.data = data
        self.error = error

# --- Fake HTTPClient to simulate async behavior and responses ---

class FakeAsyncResponse:
    def __init__(self, status_code=200, json_data=None, raise_exc=None):
        self.status_code = status_code
        self._json_data = json_data or {}
        self._raise_exc = raise_exc

    def json(self):
        if self._raise_exc:
            raise self._raise_exc
        return self._json_data

class FakeHTTPClient:
    def __init__(self, responses=None, headers=None, base_url="http://localhost"):
        # responses: dict of shelf_id -> response
        self.responses = responses or {}
        self.headers = headers or {"Authorization": "Token dummy"}
        self.base_url = base_url

    def get_base_url(self):
        return self.base_url

    async def execute(self, request, **kwargs):
        # Extract shelf id from URL
        try:
            shelf_id = int(request.url.split("/")[-1])
        except Exception:
            shelf_id = None
        # Simulate response for shelf_id
        if shelf_id in self.responses:
            resp = self.responses[shelf_id]
            if isinstance(resp, Exception):
                raise resp
            return HTTPResponse(resp)
        # Default: simulate 404 for unknown shelf
        return HTTPResponse(FakeAsyncResponse(status_code=404, json_data={"error": "Shelf not found"}))

# --- BookStackClient stub ---

class BookStackClient:
    def __init__(self, http_client):
        self._client = http_client

    def get_client(self):
        return self._client
from app.sources.external.bookstack.bookstack import BookStackDataSource

# --- Unit Tests ---

@pytest.mark.asyncio
async def test_delete_shelf_basic_success():
    """Basic: Successful deletion returns success True and correct data"""
    # Setup: shelf id 1 returns success
    shelf_id = 1
    expected_json = {"message": "Shelf deleted", "id": shelf_id}
    fake_client = FakeHTTPClient(responses={
        shelf_id: FakeAsyncResponse(status_code=200, json_data=expected_json)
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    resp = await datasource.delete_shelf(shelf_id)

@pytest.mark.asyncio
async def test_delete_shelf_basic_not_found():
    """Basic: Deleting non-existent shelf returns success True with error info"""
    shelf_id = 999
    fake_client = FakeHTTPClient()
    datasource = BookStackDataSource(BookStackClient(fake_client))

    resp = await datasource.delete_shelf(shelf_id)

@pytest.mark.asyncio
async def test_delete_shelf_basic_exception_handling():
    """Basic: If client raises exception, success is False and error is set"""
    shelf_id = 2
    fake_client = FakeHTTPClient(responses={
        shelf_id: Exception("Network error")
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    resp = await datasource.delete_shelf(shelf_id)

@pytest.mark.asyncio
async def test_delete_shelf_edge_invalid_id_type():
    """Edge: Invalid shelf id type (string) should result in a 404 or error"""
    fake_client = FakeHTTPClient()
    datasource = BookStackDataSource(BookStackClient(fake_client))
    # Try passing a string instead of int
    resp = await datasource.delete_shelf("abc")  # type: ignore
    if resp.success:
        pass
    else:
        pass

@pytest.mark.asyncio
async def test_delete_shelf_edge_missing_http_client():
    """Edge: BookStackDataSource should raise ValueError if HTTP client is missing"""
    class DummyBookStackClient:
        def get_client(self):
            return None
    with pytest.raises(ValueError):
        BookStackDataSource(DummyBookStackClient())

@pytest.mark.asyncio
async def test_delete_shelf_edge_missing_base_url_method():
    """Edge: BookStackDataSource should raise ValueError if HTTP client lacks get_base_url"""
    class DummyHTTPClient:
        pass
    class DummyBookStackClient:
        def get_client(self):
            return DummyHTTPClient()
    with pytest.raises(ValueError):
        BookStackDataSource(DummyBookStackClient())

@pytest.mark.asyncio
async def test_delete_shelf_edge_concurrent_deletes():
    """Edge: Concurrent deletion requests should all complete correctly"""
    shelf_ids = [10, 20, 30]
    fake_client = FakeHTTPClient(responses={
        10: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": 10}),
        20: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": 20}),
        30: Exception("Delete failed")
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    # Run all deletes concurrently
    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in shelf_ids)
    )

@pytest.mark.asyncio
async def test_delete_shelf_large_scale_many_deletes():
    """Large Scale: Deleting many shelves concurrently should succeed for all"""
    num_shelves = 50
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid})
        for sid in range(1, num_shelves+1)
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in range(1, num_shelves+1))
    )
    # All should succeed
    for sid, resp in enumerate(results, start=1):
        pass

@pytest.mark.asyncio
async def test_delete_shelf_large_scale_mixed_success_failure():
    """Large Scale: Mixed success/failure for batch deletes"""
    num_shelves = 20
    # Odd ids succeed, even ids fail
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid}) if sid % 2 else Exception("Delete failed")
        for sid in range(1, num_shelves+1)
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in range(1, num_shelves+1))
    )
    for sid, resp in enumerate(results, start=1):
        if sid % 2:
            pass
        else:
            pass

# --- Throughput Tests ---

@pytest.mark.asyncio
async def test_delete_shelf_throughput_small_load():
    """Throughput: Small load (5 shelves) deletes should complete quickly and correctly"""
    shelf_ids = [101, 102, 103, 104, 105]
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid})
        for sid in shelf_ids
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in shelf_ids)
    )
    for sid, resp in zip(shelf_ids, results):
        pass

@pytest.mark.asyncio
async def test_delete_shelf_throughput_medium_load():
    """Throughput: Medium load (50 shelves) deletes should complete correctly"""
    shelf_ids = list(range(200, 250))
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid})
        for sid in shelf_ids
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in shelf_ids)
    )
    for sid, resp in zip(shelf_ids, results):
        pass

@pytest.mark.asyncio
async def test_delete_shelf_throughput_high_volume():
    """Throughput: High volume (200 shelves) deletes should complete correctly and efficiently"""
    shelf_ids = list(range(1000, 1200))
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid})
        for sid in shelf_ids
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    # Run all deletes concurrently
    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in shelf_ids)
    )
    # All should succeed
    for sid, resp in zip(shelf_ids, results):
        pass

@pytest.mark.asyncio
async def test_delete_shelf_throughput_mixed_load():
    """Throughput: Mixed load with some failures and successes"""
    shelf_ids = list(range(5000, 5020))
    # Every 3rd shelf id fails
    fake_client = FakeHTTPClient(responses={
        sid: FakeAsyncResponse(status_code=200, json_data={"message": "Deleted", "id": sid}) if sid % 3 else Exception("Delete failed")
        for sid in shelf_ids
    })
    datasource = BookStackDataSource(BookStackClient(fake_client))

    results = await asyncio.gather(
        *(datasource.delete_shelf(sid) for sid in shelf_ids)
    )
    for sid, resp in zip(shelf_ids, results):
        if sid % 3:
            pass
        else:
            pass
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
import asyncio
# Import the function under test, exactly as provided
# (Copy-paste from prompt)
from typing import Dict, Union

import pytest
from app.sources.external.bookstack.bookstack import BookStackDataSource

# Mocks and helpers for dependencies

class DummyAsyncClient:
    """A dummy async HTTP client to simulate httpx.AsyncClient behavior."""
    def __init__(self, should_fail=False, fail_with=None, response_json=None):
        self.should_fail = should_fail
        self.fail_with = fail_with
        self._response_json = response_json or {"message": "deleted"}
        self._request_calls = []

    async def request(self, method, url, **kwargs):
        self._request_calls.append((method, url, kwargs))
        if self.should_fail:
            raise self.fail_with if self.fail_with else Exception("Simulated failure")
        # Simulate a httpx.Response-like object
        class DummyResponse:
            def json(inner_self):
                return self._response_json
        return DummyResponse()

class DummyHTTPRequest:
    def __init__(self, method, url, headers, query_params, body):
        self.method = method
        self.url = url
        self.headers = headers
        self.query_params = query_params
        self.body = body
        self.path_params = {}  # not used in delete_shelf

class DummyHTTPResponse:
    def __init__(self, response):
        self._response = response
    def json(self):
        return self._response.json()

class DummyHTTPClient:
    """A dummy HTTP client that mimics the interface expected by BookStackDataSource."""
    def __init__(self, should_fail=False, fail_with=None, response_json=None):
        self.headers = {"Authorization": "Token dummy:dummy", "Content-Type": "application/json", "Accept": "application/json"}
        self.should_fail = should_fail
        self.fail_with = fail_with
        self._response_json = response_json
        self._client = DummyAsyncClient(should_fail, fail_with, response_json)
        self._base_url = "https://bookstack.example.com"
    async def execute(self, request, **kwargs):
        resp = await self._client.request(request.method, request.url, **kwargs)
        return DummyHTTPResponse(resp)
    def get_base_url(self):
        return self._base_url

class DummyBookStackRESTClientViaToken(DummyHTTPClient):
    def __init__(self, base_url="https://bookstack.example.com", should_fail=False, fail_with=None, response_json=None):
        super().__init__(should_fail=should_fail, fail_with=fail_with, response_json=response_json)
        self.base_url = base_url
    def get_base_url(self):
        return self.base_url

class DummyBookStackClient:
    """A dummy BookStackClient for dependency injection."""
    def __init__(self, client):
        self.client = client
    def get_client(self):
        return self.client


class BookStackResponse:
    def __init__(self, success: bool, data=None, error=None):
        self.success = success
        self.data = data
        self.error = error
from app.sources.external.bookstack.bookstack import BookStackDataSource

# ------------------- UNIT TESTS -------------------

# 1. Basic Test Cases

@pytest.mark.asyncio
async def test_delete_shelf_success_basic():
    """Test that delete_shelf returns success=True and correct data for a valid shelf id."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    result = await datasource.delete_shelf(42)

@pytest.mark.asyncio
async def test_delete_shelf_returns_expected_structure():
    """Test that the returned BookStackResponse has the expected attributes."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    result = await datasource.delete_shelf(1)

@pytest.mark.asyncio
async def test_delete_shelf_async_behavior():
    """Test that delete_shelf is awaitable and works with await."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    codeflash_output = datasource.delete_shelf(99); coro = codeflash_output
    result = await coro

# 2. Edge Test Cases

@pytest.mark.asyncio
async def test_delete_shelf_invalid_id_type():
    """Test delete_shelf with an invalid id type (e.g., string instead of int)."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    # The function will accept any id, but the URL will be constructed with it
    # Should not raise, but the URL will be malformed if id is not int
    result = await datasource.delete_shelf("not-an-int")

@pytest.mark.asyncio
async def test_delete_shelf_raises_exception_on_http_failure():
    """Test that delete_shelf returns success=False and error on HTTP client failure."""
    client = DummyBookStackRESTClientViaToken(should_fail=True, fail_with=RuntimeError("HTTP error"))
    datasource = BookStackDataSource(DummyBookStackClient(client))
    result = await datasource.delete_shelf(123)

@pytest.mark.asyncio
async def test_delete_shelf_handles_non_json_response():
    """Test that delete_shelf handles a response object whose json() raises an exception."""
    class BadResponse:
        def json(self):
            raise ValueError("Not JSON")
    class BadHTTPClient(DummyBookStackRESTClientViaToken):
        async def execute(self, request, **kwargs):
            return DummyHTTPResponse(BadResponse())
    datasource = BookStackDataSource(DummyBookStackClient(BadHTTPClient()))
    result = await datasource.delete_shelf(555)

@pytest.mark.asyncio
async def test_delete_shelf_concurrent_calls():
    """Test concurrent execution of delete_shelf with different ids."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    ids = [10, 20, 30, 40, 50]
    coros = [datasource.delete_shelf(i) for i in ids]
    results = await asyncio.gather(*coros)
    for result in results:
        pass

@pytest.mark.asyncio
async def test_delete_shelf_missing_http_client():
    """Test that an error is raised if the HTTP client is not initialized."""
    class NoClient:
        def get_client(self):
            return None
    with pytest.raises(ValueError, match="HTTP client is not initialized"):
        BookStackDataSource(NoClient())

@pytest.mark.asyncio
async def test_delete_shelf_http_client_missing_get_base_url():
    """Test that an error is raised if the HTTP client lacks get_base_url()."""
    class NoBaseUrlClient:
        def get_client(self):
            return object()
    with pytest.raises(ValueError, match="HTTP client does not have get_base_url method"):
        BookStackDataSource(NoBaseUrlClient())

# 3. Large Scale Test Cases

@pytest.mark.asyncio
async def test_delete_shelf_many_concurrent_calls():
    """Test delete_shelf with a large number of concurrent calls (50)."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    ids = list(range(100, 150))
    coros = [datasource.delete_shelf(i) for i in ids]
    results = await asyncio.gather(*coros)
    # All should succeed and return the dummy JSON
    for result in results:
        pass

@pytest.mark.asyncio
async def test_delete_shelf_concurrent_failures():
    """Test concurrent calls where some fail and some succeed."""
    # First 5 succeed, last 5 fail
    clients = [DummyBookStackRESTClientViaToken() for _ in range(5)] + [
        DummyBookStackRESTClientViaToken(should_fail=True, fail_with=RuntimeError("fail")) for _ in range(5)
    ]
    datasources = [BookStackDataSource(DummyBookStackClient(c)) for c in clients]
    coros = [ds.delete_shelf(i) for i, ds in enumerate(datasources)]
    results = await asyncio.gather(*coros)
    for i, result in enumerate(results):
        if i < 5:
            pass
        else:
            pass

# 4. Throughput Test Cases

@pytest.mark.asyncio
async def test_delete_shelf_throughput_small_load():
    """Throughput test: delete_shelf under small load (10 concurrent requests)."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    ids = list(range(10))
    coros = [datasource.delete_shelf(i) for i in ids]
    results = await asyncio.gather(*coros)
    for result in results:
        pass

@pytest.mark.asyncio
async def test_delete_shelf_throughput_medium_load():
    """Throughput test: delete_shelf under medium load (50 concurrent requests)."""
    client = DummyBookStackRESTClientViaToken()
    datasource = BookStackDataSource(DummyBookStackClient(client))
    ids = list(range(50))
    coros = [datasource.delete_shelf(i) for i in ids]
    results = await asyncio.gather(*coros)
    for result in results:
        pass

@pytest.mark.asyncio
async def test_delete_shelf_throughput_mixed_success_failure():
    """Throughput test: delete_shelf under mixed success/failure (25 succeed, 25 fail)."""
    clients = [DummyBookStackRESTClientViaToken() for _ in range(25)] + [
        DummyBookStackRESTClientViaToken(should_fail=True, fail_with=RuntimeError("fail")) for _ in range(25)
    ]
    datasources = [BookStackDataSource(DummyBookStackClient(c)) for c in clients]
    coros = [ds.delete_shelf(i) for i, ds in enumerate(datasources)]
    results = await asyncio.gather(*coros)
    for i, result in enumerate(results):
        if i < 25:
            pass
        else:
            pass
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
from app.sources.external.bookstack.bookstack import BookStackDataSource

To edit these changes git checkout codeflash/optimize-BookStackDataSource.delete_shelf-mhbm9esn and push.