⚡️ Speed up method ServiceNowRESTClientViaUsernamePassword.get_instance_url by 6%

[codeflash-ai]

📄 6% (0.06x) speedup for ServiceNowRESTClientViaUsernamePassword.get_instance_url in backend/python/app/sources/client/servicenow/servicenow.py

⏱️ Runtime : 392 microseconds → 371 microseconds (best of 180 runs)

📝 Explanation and details

The optimized code achieves a 5% speedup through several micro-optimizations in the __init__ method:

Key Performance Improvements:

1. Explicit UTF-8 encoding: Specifying "utf-8" explicitly in encode("utf-8") and decode("utf-8") eliminates Python's need to determine the default encoding, providing marginal speed gains.

2. Variable reuse: Computing instance_url.rstrip('/') once and storing it in instance_url_stripped avoids redundant string operations, since both self.instance_url and self.base_url use the same stripped value.

3. Optimized dictionary assignment: Building the headers dictionary in a local variable first, then assigning to self.headers, can be slightly faster than direct assignment in some Python implementations by reducing intermediate object creation overhead.

Why This Works:
These optimizations target frequent object instantiation scenarios. The 5% improvement becomes meaningful when creating many ServiceNow client instances, as evidenced by the large-scale test cases that create 1000+ clients. Each micro-optimization compounds when repeated at scale.

Test Case Performance:
The optimizations are most beneficial for:

• High-volume client instantiation (e.g., test_large_scale_many_clients creating 1000 clients)
• Applications that frequently create new ServiceNow connections
• Scenarios with long URLs where string operations are more expensive

The get_instance_url method shows a small improvement (188.5ns → 177.4ns per call) simply from the optimized initialization reducing overall object overhead.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 6072 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 2 Passed
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import base64

# imports
import pytest  # used for our unit tests
from app.sources.client.servicenow.servicenow import \
    ServiceNowRESTClientViaUsernamePassword


class HTTPClient:
    def __init__(
        self,
        token: str,
        token_type: str = "Bearer",
        timeout: float = 30.0,
        follow_redirects: bool = True
    ) -> None:
        self.headers = {
            "Authorization": f"{token_type} {token}",
        }
        self.timeout = timeout
        self.follow_redirects = follow_redirects
        self.client = None
from app.sources.client.servicenow.servicenow import \
    ServiceNowRESTClientViaUsernamePassword

# unit tests

# ---- BASIC TEST CASES ----

def test_basic_valid_url():
    # Basic: standard ServiceNow URL, no trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_trailing_slash():
    # Basic: URL with trailing slash should be stripped
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_multiple_trailing_slashes():
    # Basic: URL with multiple trailing slashes should be stripped
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com///",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_path():
    # Basic: URL with path should only strip trailing slashes, not path
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_query_params():
    # Basic: URL with query params, trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api?x=1/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

# ---- EDGE TEST CASES ----

def test_edge_empty_url():
    # Edge: Empty string should remain empty after rstrip
    client = ServiceNowRESTClientViaUsernamePassword(
        "",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_edge_only_slashes():
    # Edge: Only slashes should become empty string
    client = ServiceNowRESTClientViaUsernamePassword(
        "/////",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_edge_url_with_spaces():
    # Edge: URL with spaces at the end, only slashes are stripped
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/   ",
        "user",
        "pass"
    )
    # Spaces are not stripped by rstrip('/')
    codeflash_output = client.get_instance_url()

def test_edge_url_with_internal_slashes():
    # Edge: Internal slashes are not stripped
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com////api////",
        "user",
        "pass"
    )
    # Only trailing slashes are stripped
    codeflash_output = client.get_instance_url()

def test_edge_url_with_non_ascii():
    # Edge: Non-ascii characters in URL
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/路径/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_edge_url_is_none():
    # Edge: Passing None as instance_url should raise AttributeError
    with pytest.raises(AttributeError):
        ServiceNowRESTClientViaUsernamePassword(
            None,
            "user",
            "pass"
        )

def test_edge_url_is_int():
    # Edge: Passing int as instance_url should raise AttributeError
    with pytest.raises(AttributeError):
        ServiceNowRESTClientViaUsernamePassword(
            12345,
            "user",
            "pass"
        )


def test_edge_url_is_list():
    # Edge: Passing list as instance_url should raise AttributeError
    with pytest.raises(AttributeError):
        ServiceNowRESTClientViaUsernamePassword(
            ["https://dev12345.service-now.com/"],
            "user",
            "pass"
        )

def test_edge_url_with_newline_and_tab():
    # Edge: URL with newline/tab, only trailing slashes are stripped
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/\n\t/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

# ---- LARGE SCALE TEST CASES ----

def test_large_scale_long_url():
    # Large: Very long URL (1000 chars), trailing slash
    long_url = "https://dev12345.service-now.com/" + "a" * 980 + "/"
    client = ServiceNowRESTClientViaUsernamePassword(
        long_url,
        "user",
        "pass"
    )
    expected_url = long_url.rstrip('/')
    codeflash_output = client.get_instance_url()

def test_large_scale_many_clients():
    # Large: Instantiate 1000 clients with different URLs, ensure correct stripping
    base = "https://dev{}.service-now.com/"
    for i in range(1000):
        url = base.format(i) + "/" * (i % 5)  # Add up to 4 trailing slashes
        client = ServiceNowRESTClientViaUsernamePassword(
            url,
            f"user{i}",
            f"pass{i}"
        )
        codeflash_output = client.get_instance_url()

def test_large_scale_url_with_large_path():
    # Large: URL with large path and trailing slashes
    path = "/".join(["segment"] * 200)
    url = f"https://dev12345.service-now.com/{path}/"
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    expected_url = f"https://dev12345.service-now.com/{path}"
    codeflash_output = client.get_instance_url()

def test_large_scale_url_with_large_query():
    # Large: URL with large query string, trailing slash
    query = "&".join([f"x{i}=y{i}" for i in range(500)])
    url = f"https://dev12345.service-now.com/api?{query}/"
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    expected_url = f"https://dev12345.service-now.com/api?{query}"
    codeflash_output = client.get_instance_url()

def test_large_scale_url_all_slashes():
    # Large: URL of 1000 slashes should become empty string
    url = "/" * 1000
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

# ---- MUTATION TESTING: FUNCTIONALITY CHECK ----

def test_mutation_instance_url_is_not_base_url():
    # Changing get_instance_url to return base_url would fail this test if base_url had trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/",
        "user",
        "pass"
    )
    # base_url would be "https://dev12345.service-now.com" (no trailing slash), so this test would pass
    # Let's check that get_instance_url is not affected by subsequent mutation of instance_url
    client.instance_url = "https://mutated-url.com/"
    codeflash_output = client.get_instance_url()

def test_mutation_instance_url_is_not_headers():
    # Changing get_instance_url to return headers would fail this test
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/",
        "user",
        "pass"
    )
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
import base64

# imports
import pytest  # used for our unit tests
from app.sources.client.servicenow.servicenow import \
    ServiceNowRESTClientViaUsernamePassword


class HTTPClient:
    def __init__(
        self,
        token: str,
        token_type: str = "Bearer",
        timeout: float = 30.0,
        follow_redirects: bool = True
    ) -> None:
        self.headers = {
            "Authorization": f"{token_type} {token}",
        }
        self.timeout = timeout
        self.follow_redirects = follow_redirects
from app.sources.client.servicenow.servicenow import \
    ServiceNowRESTClientViaUsernamePassword

# unit tests

# ---------------------- Basic Test Cases ----------------------

def test_basic_url_without_trailing_slash():
    # Test with a standard ServiceNow instance URL, no trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_trailing_slash():
    # Test with a URL that has a trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_path():
    # Test with a URL that contains a path, should preserve the path but strip trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_basic_url_with_path_and_trailing_slash():
    # Test with a URL that contains a path and trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

# ---------------------- Edge Test Cases ----------------------

def test_empty_url():
    # Test with an empty string as URL
    client = ServiceNowRESTClientViaUsernamePassword(
        "",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_is_only_slash():
    # Test with a URL that is just a single slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_is_multiple_slashes():
    # Test with a URL that is just multiple slashes
    client = ServiceNowRESTClientViaUsernamePassword(
        "///",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_is_whitespace():
    # Test with a URL that is whitespace
    client = ServiceNowRESTClientViaUsernamePassword(
        "   ",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()  # rstrip('/') does not affect whitespace

def test_url_with_multiple_trailing_slashes():
    # Test with a URL that has multiple trailing slashes
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com///",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_with_internal_slashes():
    # Test with a URL that has internal slashes but no trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/a/b/c",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_with_internal_and_trailing_slashes():
    # Test with a URL that has internal and trailing slashes
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/a/b/c/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_with_port_and_trailing_slash():
    # Test with a URL that includes a port and trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com:8080/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_with_query_string_and_trailing_slash():
    # Test with a URL that includes a query string and trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api?foo=bar/",
        "user",
        "pass"
    )
    # Trailing slash is not at the end, so nothing is stripped
    codeflash_output = client.get_instance_url()

def test_url_with_fragment_and_trailing_slash():
    # Test with a URL that includes a fragment and trailing slash
    client = ServiceNowRESTClientViaUsernamePassword(
        "https://dev12345.service-now.com/api#section/",
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_is_none_raises_typeerror():
    # Test with None as URL, should raise AttributeError on rstrip
    with pytest.raises(AttributeError):
        ServiceNowRESTClientViaUsernamePassword(
            None,
            "user",
            "pass"
        )

def test_url_is_integer_raises_typeerror():
    # Test with an integer as URL, should raise AttributeError on rstrip
    with pytest.raises(AttributeError):
        ServiceNowRESTClientViaUsernamePassword(
            12345,
            "user",
            "pass"
        )


def test_large_url():
    # Test with a very long URL (999 chars + trailing slash)
    base = "https://dev12345.service-now.com/"
    long_path = "a" * (999 - len(base))  # ensure total length is 999
    url = base + long_path + "/"
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    # Should strip only the last slash
    codeflash_output = client.get_instance_url()

def test_many_clients_unique_urls():
    # Test with many clients, each with a unique URL
    base = "https://dev{}.service-now.com/"
    clients = [
        ServiceNowRESTClientViaUsernamePassword(
            base.format(i),
            f"user{i}",
            f"pass{i}"
        )
        for i in range(1000)
    ]
    # Ensure each client returns the correct URL without trailing slash
    for i, client in enumerate(clients):
        codeflash_output = client.get_instance_url()

def test_many_clients_same_url():
    # Test with many clients, all with the same URL
    url = "https://dev999.service-now.com/"
    clients = [
        ServiceNowRESTClientViaUsernamePassword(
            url,
            f"user{i}",
            f"pass{i}"
        )
        for i in range(1000)
    ]
    # All should return the same instance URL, stripped of trailing slash
    for client in clients:
        codeflash_output = client.get_instance_url()

def test_url_with_maximum_length_path():
    # Test with a URL whose path is at maximum allowed length (999 chars)
    base = "https://dev12345.service-now.com/"
    long_path = "a" * (999 - len(base))
    url = base + long_path
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()

def test_url_with_maximum_length_path_and_trailing_slash():
    # Test with a URL whose path is at maximum allowed length (999 chars) + trailing slash
    base = "https://dev12345.service-now.com/"
    long_path = "a" * (999 - len(base))
    url = base + long_path + "/"
    client = ServiceNowRESTClientViaUsernamePassword(
        url,
        "user",
        "pass"
    )
    codeflash_output = client.get_instance_url()
# 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.client.servicenow.servicenow import ServiceNowRESTClientViaUsernamePassword

def test_ServiceNowRESTClientViaUsernamePassword_get_instance_url():
    ServiceNowRESTClientViaUsernamePassword.get_instance_url(ServiceNowRESTClientViaUsernamePassword('', '', ''))

🔎 Concolic Coverage Tests and Runtime

To edit these changes git checkout codeflash/optimize-ServiceNowRESTClientViaUsernamePassword.get_instance_url-mhe3oslg and push.