Fast fingerprint of source tree based on file mtimes. Uses os.scandir (3x faster than os.walk on Windows — DirEntry.stat() reuses data from FindFirstFile, avoiding extra syscalls). Caches the result within the same process invocation (cleared after 0.5s).
()
| 127 | |
| 128 | |
| 129 | def _compute_src_fingerprint() -> str: |
| 130 | """Fast fingerprint of source tree based on file mtimes. |
| 131 | |
| 132 | Uses os.scandir (3x faster than os.walk on Windows — DirEntry.stat() |
| 133 | reuses data from FindFirstFile, avoiding extra syscalls). |
| 134 | Caches the result within the same process invocation (cleared after 0.5s). |
| 135 | """ |
| 136 | global _cached_fingerprint, _cached_fingerprint_time |
| 137 | now = time.monotonic() |
| 138 | if _cached_fingerprint is not None and (now - _cached_fingerprint_time) < 0.5: |
| 139 | return _cached_fingerprint |
| 140 | |
| 141 | h = hashlib.md5(usedforsecurity=False) |
| 142 | src_dir = str(PROJECT_ROOT / "src") |
| 143 | _EXTS = (".cpp", ".h", ".hpp", ".c") |
| 144 | |
| 145 | # Recursive scandir — on Windows, DirEntry.stat() is free (no extra syscall) |
| 146 | def _scan(path: str) -> None: |
| 147 | try: |
| 148 | entries = sorted(os.scandir(path), key=lambda e: e.name) |
| 149 | except OSError: |
| 150 | return |
| 151 | subdirs: list[str] = [] |
| 152 | for entry in entries: |
| 153 | if entry.is_dir(follow_symlinks=False): |
| 154 | subdirs.append(entry.path) |
| 155 | elif entry.is_file(follow_symlinks=False) and entry.name.endswith(_EXTS): |
| 156 | try: |
| 157 | st = entry.stat() |
| 158 | h.update(f"{entry.path}:{st.st_mtime:.6f}".encode()) |
| 159 | except OSError: |
| 160 | h.update(f"{entry.path}:MISSING".encode()) |
| 161 | for d in subdirs: |
| 162 | _scan(d) |
| 163 | |
| 164 | _scan(src_dir) |
| 165 | |
| 166 | # Also hash build config files that affect the library |
| 167 | for config_file in [ |
| 168 | PROJECT_ROOT / "src" / "platforms" / "wasm" / "compiler" / "build_flags.toml", |
| 169 | PROJECT_ROOT / "meson.build", |
| 170 | PROJECT_ROOT / "ci" / "meson" / "wasm" / "meson.build", |
| 171 | PROJECT_ROOT / "ci" / "meson" / "wasm_cross_file.ini", |
| 172 | ]: |
| 173 | try: |
| 174 | h.update(f"{config_file}:{config_file.stat().st_mtime:.6f}".encode()) |
| 175 | except OSError: |
| 176 | h.update(f"{config_file}:MISSING".encode()) |
| 177 | |
| 178 | _cached_fingerprint = h.hexdigest() |
| 179 | _cached_fingerprint_time = now |
| 180 | return _cached_fingerprint |
| 181 | |
| 182 | |
| 183 | def _iter_js_affecting_files() -> list[Path]: |
no test coverage detected