⚡️ Speed up method BaseClient._parse_retry_after_header by 84%
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The optimization replaces the `.get()` method calls with direct dictionary-style lookups using `in` operator checks followed by `[]` access. This yields an **83% speedup** by eliminating redundant header key normalizations.
**Key changes:**
1. **Header lookup strategy**: Changed from `response_headers.get("retry-after-ms", None)` to `if "retry-after-ms" in response_headers: retry_ms_header = response_headers["retry-after-ms"]`
2. **Restructured control flow**: Combined the retry-after date parsing logic into the same conditional block to avoid duplicate header lookups
**Why this is faster:**
- `httpx.Headers.get()` performs case-insensitive header name normalization on every call, which involves string processing overhead
- The `in` operator and `[]` access are more direct operations that avoid this normalization step
- By checking for header existence first with `in`, we only perform the actual value retrieval when the header is present
- The restructured flow eliminates a separate `.get("retry-after")` call by reusing the header value already retrieved
**Performance characteristics:**
- Most effective when headers are missing (common case), as the optimized version can short-circuit faster
- Also benefits cases where headers are present due to reduced method call overhead
- The line profiler shows the header lookup operations dropped from ~30μs to ~21μs total time
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📄 84% (0.84x) speedup for
BaseClient._parse_retry_after_headerinsrc/openai/_base_client.py⏱️ Runtime :
14.9 microseconds→8.14 microseconds(best of31runs)📝 Explanation and details
The optimization replaces the
.get()method calls with direct dictionary-style lookups usinginoperator checks followed by[]access. This yields an 83% speedup by eliminating redundant header key normalizations.Key changes:
response_headers.get("retry-after-ms", None)toif "retry-after-ms" in response_headers: retry_ms_header = response_headers["retry-after-ms"]Why this is faster:
httpx.Headers.get()performs case-insensitive header name normalization on every call, which involves string processing overheadinoperator and[]access are more direct operations that avoid this normalization stepin, we only perform the actual value retrieval when the header is present.get("retry-after")call by reusing the header value already retrievedPerformance characteristics:
✅ Correctness verification report:
🔎 Concolic Coverage Tests and Runtime
codeflash_concolic_g6lys7gg/tmpi7fbcix4/test_concolic_coverage.py::test_BaseClient__parse_retry_after_headercodeflash_concolic_g6lys7gg/tmpi7fbcix4/test_concolic_coverage.py::test_BaseClient__parse_retry_after_header_2codeflash_concolic_g6lys7gg/tmpi7fbcix4/test_concolic_coverage.py::test_BaseClient__parse_retry_after_header_3To edit these changes
git checkout codeflash/optimize-BaseClient._parse_retry_after_header-mhd99b3band push.