[feat] add otel adapters

adapter/otel/logging.py

@@ -0,0 +1,57 @@
+from opentelemetry._logs import Logger as OtelApiLogger
+from opentelemetry._logs import SeverityNumber
+
+from usecase.interface import Attrs
+
+_LEVELS = {
+    'DEBUG': 10,
+    'INFO': 20,
+    'WARN': 30,
+    'WARNING': 30,
+    'ERROR': 40,
+    'FATAL': 50,
+    'CRITICAL': 50,
+}
+
+
+class OtelLogger:
+    def __init__(self, logger: OtelApiLogger, level: str) -> None:
+        self._logger = logger
+        self._threshold = _log_level_value(level)
+
+    def debug(self, message: str, attrs: Attrs | None = None) -> None:
+        self._emit('DEBUG', SeverityNumber.DEBUG, _LEVELS['DEBUG'], message, attrs)
+
+    def info(self, message: str, attrs: Attrs | None = None) -> None:
+        self._emit('INFO', SeverityNumber.INFO, _LEVELS['INFO'], message, attrs)
+
+    def warning(self, message: str, attrs: Attrs | None = None) -> None:
+        self._emit('WARN', SeverityNumber.WARN, _LEVELS['WARNING'], message, attrs)
+
+    def error(self, message: str, attrs: Attrs | None = None) -> None:
+        self._emit('ERROR', SeverityNumber.ERROR, _LEVELS['ERROR'], message, attrs)
+
+    def _emit(
+        self,
+        severity_text: str,
+        severity_number: SeverityNumber,
+        level: int,
+        message: str,
+        attrs: Attrs | None,
+    ) -> None:
+        if level < self._threshold:
+            return
+
+        self._logger.emit(
+            severity_text=severity_text,
+            severity_number=severity_number,
+            body=message,
+            attributes=None if attrs is None else dict(attrs),
+        )
+
+
+def _log_level_value(level: str) -> int:
+    normalized = level.strip().upper()
+    if normalized not in _LEVELS:
+        raise ValueError('invalid log level')
+    return _LEVELS[normalized]