move RLBootstrapDataset into a own class with its own test file

server/dataset/RLBootstrapDataset.py

@@ -0,0 +1,124 @@
+from datetime import UTC, datetime
+from pathlib import Path
+from typing import Any
+
+import gzip, json, os
+
+class RLBootstrapDataset:
+  def __init__(self):
+    self.enabled = self._env_bool("RL_BOOTSTRAP_ENABLED", default=False)
+    self.min_base_rows = self._env_int("RL_MIN_BASE_ROWS", default=5000)
+    self.base_dataset_path = Path(os.getenv("RL_BASE_DATASET", "data/dataset/best_moves.jsonl"))
+    self.output_path = Path(os.getenv("RL_BOOTSTRAP_OUTPUT", "data/dataset/rl_bootstrap.jsonl"))
+    self.max_bytes = int(float(os.getenv("RL_BOOTSTRAP_MAX_MB", "50")) * 1024 * 1024)
+    self.needs_more_data = False
+
+  @staticmethod
+  def _env_bool(name:str, default:bool=False) -> bool:
+    value = os.getenv(name)
+    if value is None:
+      return default
+    return value.lower() in {"1", "true", "yes", "on"}
+
+  @staticmethod
+  def _env_int(name:str, default:int) -> int:
+    value = os.getenv(name)
+    if value is None:
+      return default
+    try:
+      return int(value)
+    except ValueError:
+      return default
+
+  @staticmethod
+  def count_jsonl_rows(path:Path) -> int:
+    count = 0
+
+    candidates = [path]
+    if path.suffix == ".gz":
+      candidates.append(path.with_suffix(""))
+    else:
+      candidates.append(Path(f"{path}.gz"))
+
+    seen = set()
+    for candidate in candidates:
+      if candidate in seen:
+        continue
+      seen.add(candidate)
+
+      if not candidate.exists() or not candidate.is_file():
+        continue
+
+      open_fn = gzip.open if candidate.suffix == ".gz" else open
+      try:
+        with open_fn(candidate, "rt", encoding="utf-8") as handle:
+          for line in handle:
+            if line.strip():
+              count += 1
+      except (OSError, UnicodeError):
+        continue
+
+    return count
+
+  @staticmethod
+  def rotate_and_gzip_if_size_reached(path:Path, max_bytes:int) -> bool:
+    if max_bytes <= 0:
+      return False
+    if not path.exists() or not path.is_file():
+      return False
+    if path.stat().st_size < max_bytes:
+      return False
+
+    timestamp = datetime.now(UTC).strftime("%Y%m%d-%H%M%S")
+    if path.suffix == ".jsonl":
+      rotated_name = f"{path.stem}.{timestamp}.jsonl"
+    else:
+      rotated_name = f"{path.name}.{timestamp}"
+
+    rotated_path = path.with_name(rotated_name)
+    suffix = 1
+    while rotated_path.exists():
+      suffix += 1
+      if path.suffix == ".jsonl":
+        rotated_name = f"{path.stem}.{timestamp}.{suffix}.jsonl"
+      else:
+        rotated_name = f"{path.name}.{timestamp}.{suffix}"
+      rotated_path = path.with_name(rotated_name)
+
+    path.rename(rotated_path)
+    with rotated_path.open("rb") as src:
+      with gzip.open(f"{rotated_path}.gz", "wb") as dst:
+        dst.writelines(src)
+    rotated_path.unlink()
+    return True
+
+  def refresh_state(self):
+    if not self.enabled:
+      self.needs_more_data = False
+      return
+    base_rows = self.count_jsonl_rows(self.base_dataset_path)
+    self.needs_more_data = base_rows < self.min_base_rows
+
+  def record_sample(self, game_data:Any, move:str, safe_moves:dict[str, dict[str, int]], reason:str, scores:dict[str, float]|None=None,):
+    if not self.enabled or not self.needs_more_data:
+      return
+
+    try:
+      self.output_path.parent.mkdir(parents=True, exist_ok=True)
+      row = {
+        "source": "best_battlesnake_bootstrap",
+        "game_id": getattr(game_data, "id", None),
+        "turn": game_data.get_turn(),
+        "move": move,
+        "safe_moves": list(safe_moves.keys()),
+        "reason": reason,
+        "game_board": game_data.get_game_board_as_dict(),
+      }
+      if scores:
+        row["scores"] = {k: round(v, 5) for k, v in scores.items()}
+
+      with self.output_path.open("a", encoding="utf-8") as handle:
+        handle.write(json.dumps(row, ensure_ascii=False) + "\n")
+      self.rotate_and_gzip_if_size_reached(self.output_path, self.max_bytes)
+    except Exception:
+      return