feat: add tracker registration routing
This commit is contained in:
Dobromir Popov
291
packages/tracker/meshnet_tracker/server.py
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291
packages/tracker/meshnet_tracker/server.py
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@@ -0,0 +1,291 @@
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"""Tracker HTTP server — node registry and route selection for the inference mesh.
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HTTP API contract:
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- POST /v1/nodes/register
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Request JSON: {
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"endpoint": "http://host:port", "shard_start": int, "shard_end": int,
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"hardware_profile": object, "score": number optional
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}
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Response 200: {"node_id": str}
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Response 400: {"error": str}
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- POST /v1/nodes/{node_id}/heartbeat
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Response 200: {}
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Response 404: {"error": "node not found"}
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- GET /v1/route?model=<preset>
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Response 200: {"route": ["http://node-a", "http://node-b"]}
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Response 400/404/503: {"error": str}
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"""
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import http.server
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import json
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import threading
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import time
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import urllib.parse
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import uuid
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DEFAULT_MODEL_PRESETS: dict[str, dict] = {
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"stub-model": {"layers_start": 0, "layers_end": 31},
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}
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class _NodeEntry:
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__slots__ = (
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"node_id", "endpoint", "shard_start", "shard_end",
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"hardware_profile", "score", "last_heartbeat",
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)
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def __init__(
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self,
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node_id: str,
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endpoint: str,
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shard_start: int,
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shard_end: int,
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hardware_profile: dict,
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score: float,
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) -> None:
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self.node_id = node_id
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self.endpoint = endpoint
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self.shard_start = shard_start
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self.shard_end = shard_end
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self.hardware_profile = hardware_profile
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self.score = score
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self.last_heartbeat: float = time.monotonic()
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def _select_route(
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nodes: list[_NodeEntry],
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required_start: int,
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required_end: int,
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) -> tuple[list[_NodeEntry], str]:
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"""Greedy interval-cover. Returns (ordered route, error_message)."""
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candidates = sorted(nodes, key=lambda n: (n.shard_start, -n.shard_end))
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route: list[_NodeEntry] = []
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covered_up_to = required_start - 1
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while covered_up_to < required_end:
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best: _NodeEntry | None = None
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for node in candidates:
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if node.shard_start <= covered_up_to + 1 and node.shard_end > covered_up_to:
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if best is None or node.shard_end > best.shard_end:
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best = node
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if best is None:
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missing = covered_up_to + 1
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return [], f"no route available: no registered node covers layer {missing}"
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route.append(best)
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covered_up_to = best.shard_end
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candidates = [n for n in candidates if n is not best]
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return route, ""
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class _TrackerHTTPServer(http.server.HTTPServer):
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def __init__(
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self,
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addr: tuple,
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handler,
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registry: dict,
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lock: threading.Lock,
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heartbeat_timeout: float,
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model_presets: dict,
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) -> None:
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super().__init__(addr, handler)
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self.registry = registry
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self.lock = lock
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self.heartbeat_timeout = heartbeat_timeout
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self.model_presets = model_presets
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class _TrackerHandler(http.server.BaseHTTPRequestHandler):
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def log_message(self, fmt, *args): # noqa: suppress request logs in tests
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pass
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def _send_json(self, status: int, data: dict) -> None:
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body = json.dumps(data).encode()
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self.send_response(status)
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self.send_header("Content-Type", "application/json")
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self.send_header("Content-Length", str(len(body)))
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self.end_headers()
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self.wfile.write(body)
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def _read_json_body(self) -> dict | None:
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length = int(self.headers.get("Content-Length", 0))
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try:
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body = json.loads(self.rfile.read(length) or b"{}")
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except json.JSONDecodeError:
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self._send_json(400, {"error": "invalid JSON body"})
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return None
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if not isinstance(body, dict):
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self._send_json(400, {"error": "JSON body must be an object"})
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return None
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return body
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def _purge_expired_nodes(self) -> None:
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server: _TrackerHTTPServer = self.server # type: ignore[assignment]
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now = time.monotonic()
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expired_ids = [
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node_id for node_id, entry in server.registry.items()
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if (now - entry.last_heartbeat) > server.heartbeat_timeout
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]
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for node_id in expired_ids:
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del server.registry[node_id]
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def do_POST(self):
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if self.path == "/v1/nodes/register":
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self._handle_register()
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return
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parts = self.path.split("/")
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# /v1/nodes/<node_id>/heartbeat -> ['', 'v1', 'nodes', '<id>', 'heartbeat']
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if len(parts) == 5 and parts[1] == "v1" and parts[2] == "nodes" and parts[4] == "heartbeat":
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self._handle_heartbeat(parts[3])
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return
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self.send_response(404)
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self.end_headers()
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def do_GET(self):
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parsed = urllib.parse.urlparse(self.path)
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if parsed.path == "/v1/route":
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self._handle_route(parsed)
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else:
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self.send_response(404)
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self.end_headers()
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def _handle_register(self):
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server: _TrackerHTTPServer = self.server # type: ignore[assignment]
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body = self._read_json_body()
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if body is None:
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return
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endpoint = body.get("endpoint")
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if not isinstance(endpoint, str) or not endpoint:
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self._send_json(400, {"error": "endpoint is required"})
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return
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parsed_endpoint = urllib.parse.urlparse(endpoint)
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if parsed_endpoint.scheme not in {"http", "https"} or not parsed_endpoint.netloc:
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self._send_json(400, {"error": "endpoint must be an http(s) URL"})
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return
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try:
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shard_start = int(body["shard_start"])
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shard_end = int(body["shard_end"])
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score = float(body.get("score", 1.0))
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except (KeyError, TypeError, ValueError):
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self._send_json(400, {"error": "shard_start, shard_end, and score must be numeric"})
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return
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if shard_start < 0 or shard_end < 0 or shard_start > shard_end:
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self._send_json(400, {"error": "shard range must be non-negative and ordered"})
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return
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hardware_profile = body.get("hardware_profile", {})
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if not isinstance(hardware_profile, dict):
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self._send_json(400, {"error": "hardware_profile must be an object"})
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return
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node_id = str(uuid.uuid4())
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entry = _NodeEntry(
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node_id=node_id,
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endpoint=endpoint.rstrip("/"),
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shard_start=shard_start,
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shard_end=shard_end,
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hardware_profile=hardware_profile,
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score=score,
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)
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with server.lock:
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self._purge_expired_nodes()
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server.registry[node_id] = entry
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self._send_json(200, {"node_id": node_id})
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def _handle_heartbeat(self, node_id: str):
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server: _TrackerHTTPServer = self.server # type: ignore[assignment]
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with server.lock:
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self._purge_expired_nodes()
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entry = server.registry.get(node_id)
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if entry is None:
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self._send_json(404, {"error": "node not found"})
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return
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entry.last_heartbeat = time.monotonic()
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self._send_json(200, {})
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def _handle_route(self, parsed: urllib.parse.ParseResult):
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server: _TrackerHTTPServer = self.server # type: ignore[assignment]
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params = urllib.parse.parse_qs(parsed.query)
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model_list = params.get("model")
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if not model_list:
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self._send_json(400, {"error": "missing 'model' query parameter"})
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return
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model = model_list[0]
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preset = server.model_presets.get(model)
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if preset is None:
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self._send_json(404, {"error": f"unknown model preset: {model!r}"})
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return
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required_start: int = preset["layers_start"]
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required_end: int = preset["layers_end"]
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with server.lock:
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self._purge_expired_nodes()
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alive = list(server.registry.values())
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route, error = _select_route(alive, required_start, required_end)
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if error:
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self._send_json(503, {"error": error})
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return
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self._send_json(200, {"route": [e.endpoint for e in route]})
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class TrackerServer:
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"""HTTP tracker that manages node registration and resolves inference routes.
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Nodes register via POST /v1/nodes/register and keep themselves alive with
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POST /v1/nodes/<id>/heartbeat. The gateway queries GET /v1/route?model=<name>
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to obtain an ordered list of node endpoints whose shards cover all layers.
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"""
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def __init__(
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self,
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host: str = "127.0.0.1",
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port: int = 0,
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heartbeat_timeout: float = 30.0,
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model_presets: dict | None = None,
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) -> None:
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self._host = host
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self._requested_port = port
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self._heartbeat_timeout = heartbeat_timeout
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self._model_presets: dict = (
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model_presets if model_presets is not None else dict(DEFAULT_MODEL_PRESETS)
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)
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self._registry: dict[str, _NodeEntry] = {}
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self._lock = threading.Lock()
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self._server: _TrackerHTTPServer | None = None
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self._thread: threading.Thread | None = None
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self.port: int | None = None
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def start(self) -> int:
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if self._server is not None:
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raise RuntimeError("TrackerServer is already running")
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self._server = _TrackerHTTPServer(
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(self._host, self._requested_port),
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_TrackerHandler,
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self._registry,
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self._lock,
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self._heartbeat_timeout,
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self._model_presets,
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)
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self.port = self._server.server_address[1]
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self._thread = threading.Thread(target=self._server.serve_forever, daemon=True)
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self._thread.start()
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return self.port
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def stop(self) -> None:
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if self._server is None:
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return
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self._server.shutdown()
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self._server.server_close()
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if self._thread is not None:
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self._thread.join(timeout=1)
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self._server = None
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self._thread = None
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self.port = None
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