feat: feed Evennia world events into Nexus websocket bridge

FIRST_LIGHT_REPORT_EVENNIA_BRIDGE.md

@@ -0,0 +1,49 @@
+# First Light Report — Evennia to Nexus Bridge
+
+Issue:
+- #727 Feed Evennia room/command events into the Nexus websocket bridge
+
+What was implemented:
+- `nexus/evennia_ws_bridge.py` — reads Evennia telemetry JSONL and publishes normalized Evennia→Nexus events into the local websocket bridge
+- `EVENNIA_NEXUS_EVENT_PROTOCOL.md` — canonical event family contract
+- `nexus/evennia_event_adapter.py` — normalization helpers (already merged in #725)
+- `nexus/perception_adapter.py` support for `evennia.actor_located`, `evennia.room_snapshot`, and `evennia.command_result`
+- tests locking the bridge parsing and event contract
+
+Proof method:
+1. Start local Nexus websocket bridge on `ws://127.0.0.1:8765`
+2. Open a websocket listener
+3. Replay a real committed Evennia example trace from `timmy-home`
+4. Confirm normalized events are received over the websocket
+
+Observed received messages (excerpt):
+```json
+[
+  {
+    "type": "evennia.session_bound",
+    "hermes_session_id": "world-basics-trace.example",
+    "evennia_account": "Timmy",
+    "evennia_character": "Timmy"
+  },
+  {
+    "type": "evennia.command_issued",
+    "actor_id": "timmy",
+    "command_text": "look"
+  },
+  {
+    "type": "evennia.command_result",
+    "actor_id": "timmy",
+    "command_text": "look",
+    "output_text": "Chapel A quiet room set apart for prayer, conscience, grief, and right alignment...",
+    "success": true
+  }
+]
+```
+
+Interpretation:
+- Evennia world telemetry can now be published into the Nexus websocket bridge without inventing a second world model.
+- The bridge is thin: it translates and forwards.
+- Nexus-side perception code can now consume these events as part of Timmy's sensorium.
+
+Why this matters:
+This is the first live seam where Timmy's persistent Evennia place can begin to appear inside the Nexus-facing world model.

nexus/evennia_ws_bridge.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+"""Publish Evennia telemetry logs into the Nexus websocket bridge."""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import json
+import re
+from pathlib import Path
+from typing import Iterable
+
+import websockets
+
+from nexus.evennia_event_adapter import actor_located, command_issued, command_result, room_snapshot, session_bound
+
+ANSI_RE = re.compile(r"\x1b\[[0-9;]*[A-Za-z]")
+
+
+def strip_ansi(text: str) -> str:
+    return ANSI_RE.sub("", text or "")
+
+
+def clean_lines(text: str) -> list[str]:
+    text = strip_ansi(text).replace("\r", "")
+    return [line.strip() for line in text.split("\n") if line.strip()]
+
+
+def parse_room_output(text: str):
+    lines = clean_lines(text)
+    if len(lines) < 2:
+        return None
+    title = lines[0]
+    desc = lines[1]
+    exits = []
+    objects = []
+    for line in lines[2:]:
+        if line.startswith("Exits:"):
+            raw = line.split(":", 1)[1].strip()
+            raw = raw.replace(" and ", ", ")
+            exits = [{"key": token.strip(), "destination_id": token.strip().title(), "destination_key": token.strip().title()} for token in raw.split(",") if token.strip()]
+        elif line.startswith("You see:"):
+            raw = line.split(":", 1)[1].strip()
+            raw = raw.replace(" and ", ", ")
+            parts = [token.strip() for token in raw.split(",") if token.strip()]
+            objects = [{"id": p.removeprefix('a ').removeprefix('an '), "key": p.removeprefix('a ').removeprefix('an '), "short_desc": p} for p in parts]
+    return {"title": title, "desc": desc, "exits": exits, "objects": objects}
+
+
+def normalize_event(raw: dict, hermes_session_id: str) -> list[dict]:
+    out: list[dict] = []
+    event = raw.get("event")
+    actor = raw.get("actor", "Timmy")
+    timestamp = raw.get("timestamp")
+
+    if event == "connect":
+        out.append(session_bound(hermes_session_id, evennia_account=actor, evennia_character=actor, timestamp=timestamp))
+        parsed = parse_room_output(raw.get("output", ""))
+        if parsed:
+            out.append(actor_located(actor, parsed["title"], parsed["title"], timestamp=timestamp))
+            out.append(room_snapshot(parsed["title"], parsed["title"], parsed["desc"], exits=parsed["exits"], objects=parsed["objects"], timestamp=timestamp))
+        return out
+
+    if event == "command":
+        cmd = raw.get("command", "")
+        output = raw.get("output", "")
+        out.append(command_issued(hermes_session_id, actor, cmd, timestamp=timestamp))
+        success = not output.startswith("Command '") and not output.startswith("Could not find")
+        out.append(command_result(hermes_session_id, actor, cmd, strip_ansi(output), success=success, timestamp=timestamp))
+        parsed = parse_room_output(output)
+        if parsed:
+            out.append(actor_located(actor, parsed["title"], parsed["title"], timestamp=timestamp))
+            out.append(room_snapshot(parsed["title"], parsed["title"], parsed["desc"], exits=parsed["exits"], objects=parsed["objects"], timestamp=timestamp))
+        return out
+
+    return out
+
+
+async def playback(log_path: Path, ws_url: str):
+    hermes_session_id = log_path.stem
+    async with websockets.connect(ws_url) as ws:
+        for line in log_path.read_text(encoding="utf-8").splitlines():
+            if not line.strip():
+                continue
+            raw = json.loads(line)
+            for event in normalize_event(raw, hermes_session_id):
+                await ws.send(json.dumps(event))
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Publish Evennia telemetry into the Nexus websocket bridge")
+    parser.add_argument("log_path", help="Path to Evennia telemetry JSONL")
+    parser.add_argument("--ws", default="ws://127.0.0.1:8765", help="Nexus websocket bridge URL")
+    args = parser.parse_args()
+    asyncio.run(playback(Path(args.log_path).expanduser(), args.ws))
+
+
+if __name__ == "__main__":
+    main()

tests/test_evennia_ws_bridge.py

@@ -0,0 +1,36 @@
+from nexus.evennia_ws_bridge import clean_lines, normalize_event, parse_room_output, strip_ansi
+
+
+def test_strip_ansi_removes_escape_codes():
+    assert strip_ansi('\x1b[1mGate\x1b[0m') == 'Gate'
+
+
+def test_parse_room_output_extracts_room_exits_and_objects():
+    parsed = parse_room_output('\x1b[1mChapel\x1b[0m\nQuiet room.\nExits: courtyard\nYou see: a Book of the Soul and a Prayer Wall')
+    assert parsed['title'] == 'Chapel'
+    assert parsed['exits'][0]['key'] == 'courtyard'
+    keys = [obj['key'] for obj in parsed['objects']]
+    assert 'Book of the Soul' in keys
+    assert 'Prayer Wall' in keys
+
+
+def test_normalize_connect_emits_session_and_room_events():
+    events = normalize_event({'event': 'connect', 'actor': 'Timmy', 'output': 'Gate\nA threshold.\nExits: enter'}, 'sess1')
+    types = [event['type'] for event in events]
+    assert 'evennia.session_bound' in types
+    assert 'evennia.actor_located' in types
+    assert 'evennia.room_snapshot' in types
+
+
+def test_normalize_command_emits_command_and_snapshot():
+    events = normalize_event({'event': 'command', 'actor': 'timmy', 'command': 'courtyard', 'output': 'Courtyard\nOpen court.\nExits: gate, workshop\nYou see: a Map Table'}, 'sess2')
+    types = [event['type'] for event in events]
+    assert types[0] == 'evennia.command_issued'
+    assert 'evennia.command_result' in types
+    assert 'evennia.room_snapshot' in types
+
+
+def test_normalize_failed_command_marks_failure():
+    events = normalize_event({'event': 'command', 'actor': 'timmy', 'command': 'workshop', 'output': "Command 'workshop' is not available."}, 'sess3')
+    result = [event for event in events if event['type'] == 'evennia.command_result'][0]
+    assert result['success'] is False