migration: preserve frontend shell pages and styles
This commit is contained in:
leefer
@@ -0,0 +1,184 @@
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from __future__ import annotations
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import hashlib
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import json
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import re
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from pathlib import Path
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REPOSITORY_ROOT = Path(__file__).resolve().parents[2]
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ORIGINAL_STATIC = REPOSITORY_ROOT / "static"
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FRONTEND_ROOT = REPOSITORY_ROOT / "app" / "frontend"
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EVIDENCE_PATH = (
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REPOSITORY_ROOT
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/ "docs"
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/ "migration"
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/ "evidence"
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/ "slice-10"
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/ "frontend-source-map.json"
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)
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EXPECTED_SOURCE_SHA256 = "c020d0bc68f8a96b352a0ffa62c913a0ea3f5ca0afc41f70969f833e447166a6"
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RUNTIME_RANGES: dict[str, list[tuple[int, int]]] = {
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"pages/sentiment/page.js": [(1207, 1516)],
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"pages/pools/page.js": [(1517, 1915)],
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"pages/market/runtime.js": [(1916, 1957), (6893, 7719), (7969, 8426)],
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"pages/rotation/page.js": [(1958, 2124)],
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"pages/ladder/page.js": [(2125, 2216)],
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"pages/auction/page.js": [(2217, 2481)],
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"pages/themes/page.js": [(2482, 2583)],
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"pages/popularity/page.js": [(2584, 2659)],
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"pages/dragon-tiger/page.js": [(2660, 3028)],
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"pages/review/page.js": [(3029, 3470), (7720, 7968)],
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"pages/screener/page.js": [(3490, 4336), (6668, 6892)],
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"pages/mentor/page.js": [(4337, 4827)],
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"pages/heaven/page.js": [(4828, 6667)],
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"shared/export.js": [(8905, 9051)],
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}
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def digest(content: str) -> str:
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return hashlib.sha256(content.encode("utf-8")).hexdigest()
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def marker(start: int, end: int, kind: str) -> str:
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return f"/* PRESERVATION-SOURCE-{kind} app.js:{start}-{end} */"
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def wrapped_chunk(lines: list[str], start: int, end: int) -> str:
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content = "".join(lines[start - 1 : end])
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return f"{marker(start, end, 'BEGIN')}\n{content}{marker(start, end, 'END')}\n"
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def complement_ranges(total: int, moved: set[int]) -> list[tuple[int, int]]:
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ranges: list[tuple[int, int]] = []
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start = 0
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for number in range(1, total + 1):
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if number in moved:
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if start:
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ranges.append((start, number - 1))
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start = 0
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elif not start:
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start = number
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if start:
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ranges.append((start, total))
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return ranges
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def original_prefix(relative: str) -> str:
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source = ORIGINAL_STATIC / relative
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if not source.is_file():
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return ""
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return source.read_text(encoding="utf-8").rstrip("\n") + "\n\n"
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def extract_written_chunks(paths: list[Path]) -> dict[tuple[int, int], str]:
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pattern = re.compile(
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r"/\* PRESERVATION-SOURCE-BEGIN app\.js:(\d+)-(\d+) \*/\n"
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r"(.*?)"
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r"/\* PRESERVATION-SOURCE-END app\.js:\1-\2 \*/\n?",
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re.DOTALL,
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)
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chunks: dict[tuple[int, int], str] = {}
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for path in paths:
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content = path.read_text(encoding="utf-8")
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for match in pattern.finditer(content):
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key = (int(match.group(1)), int(match.group(2)))
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if key in chunks:
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raise RuntimeError(f"Duplicate preserved range {key}")
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chunks[key] = match.group(3)
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return chunks
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def main() -> None:
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source_path = ORIGINAL_STATIC / "app.js"
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target_path = FRONTEND_ROOT / "app.js"
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source_bytes = source_path.read_bytes()
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source_sha256 = hashlib.sha256(source_bytes).hexdigest()
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if source_sha256 != EXPECTED_SOURCE_SHA256:
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raise RuntimeError(
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f"Original app.js changed: expected {EXPECTED_SOURCE_SHA256}, got {source_sha256}"
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)
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if not target_path.is_file():
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raise RuntimeError(f"Missing target runtime: {target_path}")
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if hashlib.sha256(target_path.read_bytes()).hexdigest() != EXPECTED_SOURCE_SHA256:
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raise RuntimeError("Target app.js is not the exact pre-split original")
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source = source_bytes.decode("utf-8")
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lines = source.splitlines(keepends=True)
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moved_lines: set[int] = set()
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for ranges in RUNTIME_RANGES.values():
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for start, end in ranges:
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overlap = moved_lines.intersection(range(start, end + 1))
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if overlap:
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raise RuntimeError(f"Overlapping source ranges at line {min(overlap)}")
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moved_lines.update(range(start, end + 1))
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core_ranges = complement_ranges(len(lines), moved_lines)
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target_path.write_text(
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"\n".join(wrapped_chunk(lines, start, end).rstrip("\n") for start, end in core_ranges)
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+ "\n",
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encoding="utf-8",
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)
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written_paths = [target_path]
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for relative, ranges in RUNTIME_RANGES.items():
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path = FRONTEND_ROOT / relative
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path.parent.mkdir(parents=True, exist_ok=True)
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chunks = "\n".join(
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wrapped_chunk(lines, start, end).rstrip("\n") for start, end in ranges
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)
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path.write_text(original_prefix(relative) + chunks + "\n", encoding="utf-8")
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written_paths.append(path)
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extracted = extract_written_chunks(written_paths)
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expected_ranges = {
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source_range for ranges in RUNTIME_RANGES.values() for source_range in ranges
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} | set(core_ranges)
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if set(extracted) != expected_ranges:
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raise RuntimeError("Written source ranges do not cover the original runtime exactly")
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reassembled = [""] * len(lines)
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for (start, end), content in extracted.items():
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chunk_lines = content.splitlines(keepends=True)
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if len(chunk_lines) != end - start + 1:
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raise RuntimeError(f"Line count changed in preserved range {start}-{end}")
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reassembled[start - 1 : end] = chunk_lines
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reassembled_source = "".join(reassembled)
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if reassembled_source != source:
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raise RuntimeError("Split runtime cannot be reassembled byte-for-byte")
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manifest = {
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"source": "static/app.js",
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"source_sha256": source_sha256,
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"source_line_count": len(lines),
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"reassembled_sha256": digest(reassembled_source),
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"all_source_lines_preserved": True,
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"core": {
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"target": "app/frontend/app.js",
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"ranges": [{"start": start, "end": end} for start, end in core_ranges],
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},
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"modules": [
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{
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"target": f"app/frontend/{relative}",
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"ranges": [
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{
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"start": start,
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"end": end,
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"sha256": digest("".join(lines[start - 1 : end])),
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}
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for start, end in ranges
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],
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}
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for relative, ranges in RUNTIME_RANGES.items()
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],
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}
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EVIDENCE_PATH.parent.mkdir(parents=True, exist_ok=True)
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EVIDENCE_PATH.write_text(
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json.dumps(manifest, ensure_ascii=False, indent=2) + "\n", encoding="utf-8"
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)
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print(json.dumps(manifest, ensure_ascii=False, indent=2))
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if __name__ == "__main__":
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main()
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