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Port gecko.py to a standalone script in tools/perf/python/ that uses
the perf module directly to convert perf.data profiles into Firefox
Gecko profile format.
Improvements compared to the legacy script:
- Encapsulate profiler state in GeckoCLI and CategoryData classes with
full type annotations, removing global variables.
- Harden the local HTTP server in _write_and_launch(): write the
temporary profile to an isolated tempfile.TemporaryDirectory() with a
randomized UUID filename instead of the current working directory,
bind HTTPServer exclusively to 127.0.0.1 on an OS-assigned ephemeral
port (0), restrict CORS Access-Control-Allow-Origin to
'https://profiler.firefox.com' instead of '*', and restrict HTTP GET
requests exclusively to the randomized profile filename (returning
HTTP 403 for directory listings and any other path).
- Add -i/--input and -e/--event CLI options via argparse.
Add a shell test (test_gecko_python.sh) to verify the standalone script.
Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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