Add trace_fields scaffolding

pythonbpf/trace.py

@@ -0,0 +1,54 @@
+class TraceEvent:
+    def __init__(self, timestamp, comm, pid, cpu, flags, message):
+        """Represents a parsed trace pipe event"""
+        self.timestamp = timestamp  # float: timestamp in seconds
+        self.comm = comm            # str: command name
+        self.pid = pid              # int: process ID
+        self.cpu = cpu              # int: CPU number
+        self.flags = flags          # str: trace flags
+        self.message = message      # str: the actual message
+
+    def __iter__(self):
+        """Allow unpacking like the original BCC tuple"""
+        yield self.comm
+        yield self.pid
+        yield self.cpu
+        yield self.flags
+        yield self.timestamp
+        yield self.message
+
+
+class TraceReader:
+    def __init__(self, trace_pipe_path="/sys/kernel/debug/tracing/trace_pipe"):
+        self.trace_pipe_path = trace_pipe_path
+        self.file = None
+
+    def __enter__(self):
+        self.file = open(self.trace_pipe_path, "r")
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if self.file:
+            self.file.close()
+
+    def __iter__(self):
+        while True:
+            event = self.trace_fields()
+            if event:
+                yield event
+
+    def trace_fields(self):
+        """Read and parse one line from the trace pipe"""
+        if not self.file:
+            self.file = open(self.trace_pipe_path, "r")
+        line = self.file.readline()
+        if not line:
+            return None
+        # Parse the line into components (simplified)
+        # Real implementation would need more robust parsing
+        parts = self._parse_trace_line(line)
+        return TraceEvent(*parts)
+
+    def _parse_trace_line(self, line):
+        # TODO: Implement
+        pass