From 893d98bbc435caf9399b95cfb42eebcc3a6e2735 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Wed, 14 Jan 2026 15:28:04 +0000
Subject: [PATCH] Add trace_agg/src/trace_agg/core.py

---
 trace_agg/src/trace_agg/core.py | 108 ++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 trace_agg/src/trace_agg/core.py

diff --git a/trace_agg/src/trace_agg/core.py b/trace_agg/src/trace_agg/core.py
new file mode 100644
index 0000000..d21f6f5
--- /dev/null
+++ b/trace_agg/src/trace_agg/core.py
@@ -0,0 +1,108 @@
+import json
+import logging
+from dataclasses import dataclass, asdict
+from pathlib import Path
+from typing import Any, Dict, List
+
+
+# Configure module-level logger
+logger = logging.getLogger(__name__)
+if not logger.handlers:
+    logging.basicConfig(level=logging.INFO, format='[%(levelname)s] %(message)s')
+
+
+@dataclass
+class TraceData:
+    """Data model representing aggregated trace event information."""
+
+    had_sched_switch: int
+    had_irq: int
+    had_softirq: int
+    cpu_ids_seen: List[int]
+
+    def to_dict(self) -> Dict[str, Any]:
+        return asdict(self)
+
+
+class TraceDataValidationError(Exception):
+    """Raised when the input trace data validation fails."""
+
+
+
+def _validate_trace_entry(entry: Dict[str, Any]) -> None:
+    required_fields = ["had_sched_switch", "had_irq", "had_softirq", "cpu_ids_seen"]
+    for field in required_fields:
+        if field not in entry:
+            raise TraceDataValidationError(f"Missing required field: {field}")
+    if not isinstance(entry["cpu_ids_seen"], list):
+        raise TraceDataValidationError("Field 'cpu_ids_seen' must be a list")
+    for f in ["had_sched_switch", "had_irq", "had_softirq"]:
+        if not isinstance(entry[f], int):
+            raise TraceDataValidationError(f"Field '{f}' must be of type int")
+
+
+
+def _classify_trace_data(trace: TraceData) -> str:
+    """Classify trace data based on event patterns."""
+    if trace.had_sched_switch == 0 and trace.had_irq == 0 and trace.had_softirq == 0:
+        return "no_activity"
+    if trace.had_sched_switch == 0 and (trace.had_irq or trace.had_softirq):
+        return "possible_hidden_switch"
+    if trace.had_sched_switch == 1 and (trace.had_irq + trace.had_softirq) > 1:
+        return "publish_race"
+    return "normal"
+
+
+
+def aggregate_trace_data(correlation_id: str) -> Dict[str, Any]:
+    """Aggregates eBPF trace data for a given correlation_id.
+
+    Args:
+        correlation_id: Identifier used to locate trace event file.
+
+    Returns:
+        A JSON-compatible dictionary summarizing the trace data.
+    """
+    assert isinstance(correlation_id, str) and correlation_id.strip(), "correlation_id must be a non-empty string"
+
+    # Locate input file
+    input_file = Path(f"data/raw_trace_{correlation_id}.json")
+    if not input_file.exists():
+        raise FileNotFoundError(f"Trace file not found: {input_file}")
+
+    logger.info(f"Aggregating trace data from {input_file} for correlation_id={correlation_id}")
+
+    # Load and validate input JSON
+    try:
+        with input_file.open('r', encoding='utf-8') as f:
+            raw_data = json.load(f)
+    except json.JSONDecodeError as e:
+        raise TraceDataValidationError(f"Invalid JSON format in {input_file}: {e}") from e
+
+    if isinstance(raw_data, dict):
+        entries = [raw_data]
+    elif isinstance(raw_data, list):
+        entries = raw_data
+    else:
+        raise TraceDataValidationError(f"Unexpected JSON structure in {input_file}")
+
+    aggregate = TraceData(had_sched_switch=0, had_irq=0, had_softirq=0, cpu_ids_seen=[])
+
+    for entry in entries:
+        _validate_trace_entry(entry)
+        aggregate.had_sched_switch |= int(entry["had_sched_switch"])
+        aggregate.had_irq |= int(entry["had_irq"])
+        aggregate.had_softirq |= int(entry["had_softirq"])
+        aggregate.cpu_ids_seen.extend(int(cpu) for cpu in entry["cpu_ids_seen"] if isinstance(cpu, int))
+
+    aggregate.cpu_ids_seen = sorted(set(aggregate.cpu_ids_seen))
+
+    classification = _classify_trace_data(aggregate)
+
+    result = aggregate.to_dict()
+    result["correlation_id"] = correlation_id
+    result["classification"] = classification
+
+    logger.info(f"Aggregation complete for correlation_id={correlation_id}: {classification}")
+
+    return result
\ No newline at end of file