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from __future__ import annotations
import asyncio
import html
import os
import resource
import secrets
import threading
import time
import uuid
from collections import Counter
from collections.abc import Awaitable, Callable
from contextlib import asynccontextmanager
from datetime import UTC, datetime
from typing import Annotated, Any
from fastapi import APIRouter, Depends, FastAPI, Header, HTTPException
from fastapi.responses import HTMLResponse, JSONResponse
from pydantic import Field, TypeAdapter
from starlette.background import BackgroundTask
from starlette.requests import Request
from flock.controller.reconcile import agent_state, record_heartbeat, worker_state
from flock.controller.spawn import (
Refused,
SpawnAck,
SpawnRequest,
agent_depth,
agent_for_token,
agent_may,
remove_subtree,
set_token_key,
worker_cap_conflicts,
)
from flock.controller.spawn import spawn as spawn_child
from flock.controller.store import Row, Store, agent_tokens
from flock.models import (
AgentState,
AgentStatus,
Command,
CommandBatch,
EventBatch,
Harness,
PromptAck,
PromptCommand,
PromptRequest,
SwarmSpec,
SwarmStatus,
TypeHealth,
TypeStatus,
WorkerHeartbeat,
WorkerState,
WorkerStatus,
)
MAX_WAIT = 30.0
_COMMAND = TypeAdapter(Annotated[Command, Field(discriminator="kind")])
def _now() -> datetime:
return datetime.now(UTC)
def _dt(ts: float | None) -> datetime | None:
return None if ts is None else datetime.fromtimestamp(ts, UTC)
class Notifier:
"""Wake-ups for long-polls. `notify` is safe to call from any thread."""
def __init__(self) -> None:
self._events: dict[str, asyncio.Event] = {}
self._loop: asyncio.AbstractEventLoop | None = None
def _fire(self, key: str) -> None:
ev = self._events.pop(key, None)
if ev is not None:
ev.set()
def notify(self, key: str) -> None:
loop = self._loop
if loop is None or loop.is_closed():
return
try:
same = asyncio.get_running_loop() is loop
except RuntimeError:
same = False
if same:
self._fire(key)
else:
loop.call_soon_threadsafe(self._fire, key)
async def wait(self, key: str, timeout: float) -> None:
self._loop = asyncio.get_running_loop()
ev = self._events.setdefault(key, asyncio.Event())
try:
await asyncio.wait_for(ev.wait(), timeout)
except TimeoutError:
pass
async def long_poll(self, key: str, check: Callable[[], Any], wait: float) -> Any:
"""Return check()'s first truthy result, or its last result after `wait` seconds."""
self._loop = asyncio.get_running_loop()
deadline = self._loop.time() + max(0.0, min(wait, MAX_WAIT))
while True:
ev = self._events.setdefault(key, asyncio.Event()) # grab before checking: no lost wake
result = check()
remaining = deadline - self._loop.time()
if result or remaining <= 0:
return result
try:
await asyncio.wait_for(ev.wait(), remaining)
except TimeoutError:
pass
class RequestStats:
"""Pure ASGI middleware counting requests per route template and status, with latency
(sum and max) and in-flight peak, for /healthz. Long-polls count their parked time."""
def __init__(self, app) -> None:
self.app = app
self.lock = threading.Lock()
self.routes: dict[str, dict[str, float]] = {}
self.statuses: Counter[str] = Counter()
self.in_flight = 0
self.peak_in_flight = 0
self.started = time.time()
async def __call__(self, scope, receive, send):
if scope["type"] != "http":
return await self.app(scope, receive, send)
status = {"code": 500}
async def send_wrapper(message):
if message["type"] == "http.response.start":
status["code"] = message["status"]
await send(message)
t0 = time.monotonic()
with self.lock:
self.in_flight += 1
self.peak_in_flight = max(self.peak_in_flight, self.in_flight)
try:
await self.app(scope, receive, send_wrapper)
finally:
dt = time.monotonic() - t0
route = scope.get("route")
key = f"{scope['method']} {getattr(route, 'path', 'unmatched')}"
with self.lock:
self.in_flight -= 1
r = self.routes.setdefault(key, {"n": 0, "sum_s": 0.0, "max_s": 0.0, "errors": 0})
r["n"] += 1
r["sum_s"] += dt
r["max_s"] = max(r["max_s"], dt)
if status["code"] >= 500:
r["errors"] += 1
self.statuses[f"{status['code'] // 100}xx"] += 1
def snapshot(self) -> dict:
with self.lock:
routes = {
k: {"n": int(v["n"]), "mean_s": round(v["sum_s"] / v["n"], 4),
"max_s": round(v["max_s"], 3), "5xx": int(v["errors"])}
for k, v in sorted(self.routes.items())
}
return {"since": self.started, "total": sum(self.statuses.values()),
"by_status": dict(self.statuses), "in_flight": self.in_flight,
"peak_in_flight": self.peak_in_flight, "routes": routes}
def process_stats() -> dict:
"""RSS and CPU seconds of the controller process (Spaces expose no metrics API)."""
try:
with open("/proc/self/statm") as f:
rss = int(f.read().split()[1]) * os.sysconf("SC_PAGE_SIZE")
except (OSError, ValueError, IndexError):
rss = 0
t = os.times()
return {"rss_mb": round(rss / 2**20, 1),
"max_rss_mb": round(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss / 1024, 1),
"cpu_s": round(t.user + t.system, 2), "threads": threading.active_count(),
"time": round(time.time(), 1)}
# --------------------------------------------------------------------------- status builders
def agent_status(
a: Row,
w: Row | None,
spec: SwarmSpec | None,
pending: int,
now: float,
children: list[str] | None = None,
):
ts = spec.types.get(a["type"]) if spec else None
return AgentStatus(
name=a["name"],
swarm=a["swarm"],
type=a["type"],
harness=ts.harness if ts else Harness.claude,
model=ts.model if ts else "unknown",
labels=ts.labels if ts else {},
state=agent_state(a, w, now),
idle_since=_dt(a["idle_since"]),
turn_id=a["turn_id"],
worker=a["worker"],
session_id=a["session_id"],
resumed=None if a["resumed"] is None else bool(a["resumed"]),
pending=pending,
tokens=agent_tokens(a),
cost_usd=a["cost"],
harness_estimate_usd=a["harness_estimate_usd"],
turns=a["turns"],
created_at=_dt(a["created_at"]),
last_heartbeat=_dt(a["last_heartbeat"]),
last_sync=_dt(a["last_sync"]),
msgboard_principal=a["msgboard_principal"],
parent=a["parent"],
children=children or [],
depth=agent_depth(spec, a),
)
def worker_status(w: Row, agents: list[str], now: float) -> WorkerStatus:
return WorkerStatus(
id=w["id"],
swarm=w["swarm"],
type=w["type"],
job_id=w["job_id"],
state=worker_state(w, now),
deadline=_dt(w["deadline"]),
agents=agents,
last_heartbeat=_dt(w["last_heartbeat"]),
launched_at=_dt(w["launched_at"] or w["created_at"]),
crashes=w["crashes"],
)
def swarm_status(store: Store, spec: SwarmSpec, now: float) -> SwarmStatus:
workers = {w["id"]: w for w in store.list_workers(spec.swarm)}
agents = store.list_agents(spec.swarm)
pending = store.pending_counts(spec.swarm)
types: dict[str, TypeStatus] = {}
for type_name in sorted(set(spec.types) | set(store.type_names(spec.swarm))):
ts = spec.types.get(type_name)
mine = [a for a in agents if a["type"] == type_name]
by_state = Counter(agent_state(a, workers.get(a["worker"]), now).value for a in mine)
w_state = Counter(
worker_state(w, now).value for w in workers.values() if w["type"] == type_name
)
types[type_name] = TypeStatus(
name=type_name,
health=TypeHealth(store.type_health(spec.swarm, type_name)),
replicas=ts.replicas if ts else 0,
agents_by_state=dict(by_state),
workers_by_state=dict(w_state),
cost_usd=round(sum(a["cost"] for a in mine), 6),
)
return SwarmStatus(
swarm=spec.swarm,
namespace=spec.namespace,
bucket=spec.bucket,
types=types,
agents_total=len(agents),
workers_total=len(workers),
pending_prompts=sum(pending.values()),
cost_usd=round(sum(t.cost_usd for t in types.values()), 6),
)
_AGENT_STATE_TONE = {
"working": "good",
"idle": "neutral",
"stuck": "warn",
"unknown": "serious",
"dead": "crit",
}
_WORKER_STATE_TONE = {
"launching": "accent",
"running": "good",
"draining": "warn",
"unknown": "serious",
"dead": "crit",
}
_STATE_ORDER = ["working", "idle", "stuck", "unknown", "dead", "launching", "running", "draining"]
_PAGE_CSS = """
:root{--bg:#fcfcfb;--card:#ffffff;--ink:#1b1b1a;--ink2:#5c5b57;--ink3:#8a8984;--line:#e6e5e1;
--accent:#2f6fde;--good:#0ca30c;--warn:#fab219;--serious:#ec835a;--crit:#d03b3b;--neutral:#9a9994;
--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
--sans:system-ui,-apple-system,"Segoe UI",Roboto,Inter,sans-serif}
@media(prefers-color-scheme:dark){:root{--bg:#1a1a19;--card:#232321;--ink:#f1f0ec;--ink2:#b3b2ac;
--ink3:#85847f;--line:#34342f;--accent:#7ea6ff}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 var(--sans)}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1100px;margin:0 auto;padding:24px 16px 48px}
header{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 16px;margin-bottom:24px}
header h1{font-size:18px;font-weight:650;letter-spacing:-.01em;margin:0}
header .meta{color:var(--ink3);font-size:13px;margin-left:auto}
.swarm{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:20px}
.swarm h2{font-size:17px;font-weight:650;margin:0;letter-spacing:-.01em}
.kicker{color:var(--ink3);font-size:12px;text-transform:uppercase;letter-spacing:.06em}
.head{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
.sub{color:var(--ink2);font-size:13px;margin:4px 0 16px;word-break:break-all}
.sub code{font-family:var(--mono);font-size:12px;color:var(--ink2)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:18px}
.stat{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:var(--bg)}
.stat .v{font-size:26px;font-weight:600;line-height:1.1;letter-spacing:-.02em}
.stat .l{color:var(--ink2);font-size:12.5px;margin-top:4px}
.tbl{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:14px}
th{text-align:left;color:var(--ink3);font-weight:500;font-size:12px;text-transform:uppercase;
letter-spacing:.04em;padding:6px 10px;border-bottom:1px solid var(--line)}
td{padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap}th.num{text-align:right}
td.name{font-weight:600}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;
padding:1px 9px 1px 7px;font-size:12.5px;color:var(--ink2);background:var(--bg);white-space:nowrap}
.chip b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
.chip i,.badge i{width:8px;height:8px;border-radius:50%;background:var(--neutral);display:inline-block}
.good i{background:var(--good)}.warn i{background:var(--warn)}.serious i{background:var(--serious)}
.crit i{background:var(--crit)}.accent i{background:var(--accent)}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
border-radius:999px;padding:1px 9px 1px 7px;border:1px solid var(--line)}
.badge.crit{color:var(--crit);border-color:var(--crit)}
.badge.warn{color:var(--ink);border-color:var(--warn)}
details{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}
summary{cursor:pointer;color:var(--ink2);font-size:13px;user-select:none}
summary:hover{color:var(--ink)}
.agents{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.agents a{font-family:var(--mono);font-size:12px;border:1px solid var(--line);border-radius:6px;
padding:2px 7px;color:var(--ink2);background:var(--bg)}
.agents a:hover{color:var(--accent);border-color:var(--accent);text-decoration:none}
.more{color:var(--ink3);font-size:12px;align-self:center}
.empty{border:1px dashed var(--line);border-radius:12px;padding:40px 20px;text-align:center;color:var(--ink2)}
.empty code{font-family:var(--mono);font-size:13px;color:var(--ink)}
footer{color:var(--ink3);font-size:12px;margin-top:24px}
"""
def _fmt_count(n: int) -> str:
if n >= 1_000_000:
return f"{n / 1_000_000:.1f}M"
if n >= 10_000:
return f"{n / 1_000:.1f}K"
return f"{n:,}"
def _chips(counts: dict[str, int], tones: dict[str, str]) -> str:
e = html.escape
keys = sorted(counts, key=lambda s: (_STATE_ORDER.index(s) if s in _STATE_ORDER else 99, s))
chips = [
f'<span class="chip {tones.get(s, "neutral")}"><i></i>{e(s)} <b>{counts[s]}</b></span>'
for s in keys
if counts[s]
]
return (
f'<div class="chips">{"".join(chips)}</div>' if chips else '<span class="more">none</span>'
)
def _status_page(store: Store, now: float) -> str:
e = html.escape
parts = []
for sw in store.list_swarms():
spec: SwarmSpec = sw["spec"]
st = swarm_status(store, spec, now)
removing = '<span class="badge warn"><i></i>removing</span>' if sw["removing"] else ""
stats = [
(_fmt_count(st.agents_total), "agents"),
(_fmt_count(st.workers_total), "workers"),
(_fmt_count(st.pending_prompts), "pending prompts"),
(f"${st.cost_usd:,.2f}", "cost"),
]
tiles = "".join(
f'<div class="stat"><div class="v">{v}</div><div class="l">{l}</div></div>'
for v, l in stats
)
rows = []
for t in st.types.values():
health = (
'<span class="badge good"><i></i>ok</span>'
if t.health.value == "ok"
else f'<span class="badge crit"><i></i>{e(t.health.value)}</span>'
)
rows.append(
f'<tr><td class="name">{e(t.name)}</td><td>{health}</td>'
f'<td class="num">{t.replicas:,}</td>'
f"<td>{_chips(t.agents_by_state, _AGENT_STATE_TONE)}</td>"
f"<td>{_chips(t.workers_by_state, _WORKER_STATE_TONE)}</td>"
f'<td class="num">${t.cost_usd:,.2f}</td></tr>'
)
table = (
'<div class="tbl"><table><thead><tr><th>agent type</th><th>health</th>'
'<th class="num">replicas</th><th>agents</th><th>workers</th><th class="num">cost</th>'
f"</tr></thead><tbody>{''.join(rows)}</tbody></table></div>"
)
details = []
for type_name in st.types:
names = [a["name"] for a in store.list_agents(spec.swarm, type_name)]
links = "".join(f'<a href="/agents/{e(n)}">{e(n)}</a>' for n in names[:200])
more = (
f'<span class="more">and {len(names) - 200:,} more</span>'
if len(names) > 200
else ""
)
details.append(
f"<details><summary>{e(type_name)} · {len(names):,} "
f"{'agent' if len(names) == 1 else 'agents'}</summary>"
f'<div class="agents">{links}{more}</div></details>'
)
parts.append(
f'<section class="swarm"><div class="head"><span class="kicker">swarm</span>'
f"<h2>{e(spec.swarm)}</h2>{removing}</div>"
f'<p class="sub">namespace <code>{e(spec.namespace)}</code> · bucket '
f"<code>{e(spec.bucket)}</code></p>"
f'<div class="stats">{tiles}</div>{table}{"".join(details)}</section>'
)
body = "".join(parts) or (
'<div class="empty">No swarms yet.<br>Apply one with '
"<code>flock apply spec.yaml</code></div>"
)
stamp = e(_dt(now).strftime("%Y-%m-%d %H:%M:%S UTC"))
return (
"<!doctype html><html lang='en'><head><meta charset='utf-8'>"
"<meta name='viewport' content='width=device-width,initial-scale=1'>"
"<meta name='color-scheme' content='light dark'><title>flock</title>"
f"<meta http-equiv='refresh' content='30'><style>{_PAGE_CSS}</style></head>"
'<body><div class="wrap"><header><h1>flock</h1>'
f'<span class="meta">{stamp} · refreshes every 30 s</span></header>{body}'
"<footer>Agent links return JSON and need the API bearer token.</footer>"
"</div></body></html>"
)
# --------------------------------------------------------------------------- app
def create_app(
store: Store,
token: str,
background: Callable[[Notifier], Awaitable[None]] | None = None,
clock: Callable[[], datetime] = _now,
stats: Callable[[], dict] | None = None,
) -> FastAPI:
notifier = Notifier()
store.listener = lambda kind, key: notifier.notify(f"{kind}:{key}")
set_token_key(store, token)
@asynccontextmanager
async def lifespan(app: FastAPI):
notifier._loop = asyncio.get_running_loop()
task = asyncio.create_task(background(notifier)) if background else None
yield
if task:
task.cancel()
app = FastAPI(title="flock controller", lifespan=lifespan)
app.state.store, app.state.notifier = store, notifier
request_stats: dict[str, RequestStats] = {}
def make_stats(app):
request_stats["mw"] = RequestStats(app)
return request_stats["mw"]
app.add_middleware(make_stats)
def auth(request: Request, authorization: str = Header(default="")) -> None:
"""The controller token has full access. An agent token (docs/spawn.md) acts as that
agent, scoped to itself, its subtree and prompting its parent."""
if token and secrets.compare_digest(authorization, f"Bearer {token}"):
return
bearer = authorization.removeprefix("Bearer ")
agent = agent_for_token(store, bearer) if bearer != authorization else None
if agent is None:
raise HTTPException(401, "bad or missing bearer token")
route = getattr(request.scope.get("route"), "path", "")
if not agent_may(
store, agent, request.method, route, request.path_params, request.query_params
):
raise HTTPException(403, f"agent {agent['name']} may not call {request.method} {route}")
request.state.agent = agent
api = APIRouter(dependencies=[Depends(auth)])
def spec_or_404(swarm: str) -> Row:
row = store.get_swarm(swarm)
if row is None:
raise HTTPException(404, f"no swarm {swarm!r}")
return row
def agent_or_404(name: str) -> Row:
a = store.get_agent(name)
if a is None:
raise HTTPException(404, f"no agent {name!r}")
return a
@app.get("/healthz")
def healthz() -> dict:
mw = request_stats.get("mw")
return {"ok": True, **(stats() if stats else {}), "process": process_stats(),
"requests": mw.snapshot() if mw else {}}
@app.get("/", response_class=HTMLResponse)
def index() -> str:
return _status_page(store, clock().timestamp())
# ------------------------------------------------------------- swarms
@api.get("/swarms")
def list_swarms() -> list[SwarmStatus]:
now = clock().timestamp()
return [swarm_status(store, sw["spec"], now) for sw in store.list_swarms()]
@api.put("/swarms/{swarm}")
def apply(swarm: str, spec: SwarmSpec) -> SwarmStatus:
if spec.swarm != swarm:
raise HTTPException(400, "spec.swarm does not match the path")
for type_name in spec.types:
owner = store.type_owner(type_name)
if owner not in (None, swarm):
raise HTTPException(409, f"type {type_name!r} already belongs to swarm {owner!r}")
if conflicts := worker_cap_conflicts(store, spec):
raise HTTPException(409, "; ".join(conflicts))
store.put_swarm(spec, clock().timestamp())
return swarm_status(store, spec, clock().timestamp())
@api.get("/swarms/{swarm}")
def get_swarm(swarm: str) -> dict:
row = spec_or_404(swarm)
status = swarm_status(store, row["spec"], clock().timestamp())
return {
"spec": row["spec"].model_dump(mode="json"),
"status": status.model_dump(mode="json"),
"removing": bool(row["removing"]),
}
@api.delete("/swarms/{swarm}", status_code=202)
def remove(swarm: str) -> dict:
spec_or_404(swarm)
store.set_removing(swarm)
return {"swarm": swarm, "removing": True}
@api.get("/swarms/{swarm}/agents")
def list_agents(
swarm: str,
type: str | None = None,
state: AgentState | None = None,
cursor: str | None = None,
limit: int = 500,
parent: str | None = None,
) -> dict:
spec = spec_or_404(swarm)["spec"]
now = clock().timestamp()
workers = {w["id"]: w for w in store.list_workers(swarm)}
pending = store.pending_counts(swarm)
kids = store.children_by_parent(swarm)
out: list[AgentStatus] = []
rows = sorted(store.list_agents(swarm, type, parent=parent), key=lambda a: a["name"])
for a in rows:
if cursor is not None and a["name"] <= cursor:
continue
st = agent_status(a, workers.get(a["worker"]), spec, pending.get(a["name"], 0), now,
kids.get(a["name"]))
if state is None or st.state == state:
out.append(st)
if len(out) >= max(1, limit):
break
more = len(out) >= max(1, limit) and out[-1].name != rows[-1]["name"]
return {
"agents": [x.model_dump(mode="json") for x in out],
"cursor": out[-1].name if more else None,
}
# ------------------------------------------------------------- agents
@api.get("/agents/{name}")
def get_agent(name: str) -> AgentStatus:
a = agent_or_404(name)
row = store.get_swarm(a["swarm"])
w = store.get_worker(a["worker"]) if a["worker"] else None
pending = store.pending_counts(a["swarm"]).get(name, 0)
kids = [c["name"] for c in store.list_agents(parent=name)]
return agent_status(a, w, row["spec"] if row else None, pending, clock().timestamp(), kids)
@api.post("/agents/{name}/spawn", status_code=201)
def spawn(name: str, req: SpawnRequest) -> SpawnAck:
try:
ack, created = spawn_child(store, name, req, clock().timestamp())
except KeyError:
raise HTTPException(404, f"no agent {name!r}") from None
except Refused as r:
return JSONResponse({"reason": r.reason, "detail": r.message}, status_code=409)
if not created:
return JSONResponse(ack.model_dump(mode="json"), status_code=200)
return ack
@api.delete("/agents/{name}")
def remove_agent(name: str) -> dict:
a = agent_or_404(name)
if a["parent"] is None:
return JSONResponse(
{"reason": "not_spawned", "detail": "replicas are removed by scaling their type"},
status_code=409,
)
removed = remove_subtree(store, name, "removed", clock().timestamp())
store.listener("reconcile", "")
return {"removed": [r["name"] for r in removed]}
@api.get("/whoami")
def whoami(request: Request) -> dict:
a = getattr(request.state, "agent", None)
if a is None:
return {"kind": "controller"}
row = store.get_swarm(a["swarm"])
return {
"kind": "agent",
"name": a["name"],
"swarm": a["swarm"],
"type": a["type"],
"parent": a["parent"],
"depth": agent_depth(row["spec"] if row else None, a),
"children": [c["name"] for c in store.list_agents(parent=a["name"])],
}
@api.post("/agents/{name}/prompt")
def prompt(name: str, req: PromptRequest) -> PromptAck:
a = agent_or_404(name)
cmd = PromptCommand(
agent=name,
prompt_id=uuid.uuid4().hex,
text=req.text,
timeout=req.timeout,
reply_to=req.reply_to,
)
now = clock().timestamp()
store.add_prompt(name, cmd.model_dump_json(), now)
w = store.get_worker(a["worker"]) if a["worker"] else None
live = w is not None and worker_state(w, now) == WorkerState.running
return PromptAck(
prompt_id=cmd.prompt_id, agent=name, status="queued" if live else "pending"
)
@api.get("/agents/{name}/events")
async def events(name: str, after: int = 0, wait: float = 0, limit: int = 1000) -> dict:
if store.get_agent(name) is None and store.event_count(name) == 0:
raise HTTPException(404, f"no agent {name!r}")
after = max(0, after)
await notifier.long_poll(f"events:{name}", lambda: store.event_count(name) > after, wait)
evs = store.read_events(name, after, limit=max(1, min(limit, 5000)))
return {"events": evs, "next": after + len(evs)}
# ------------------------------------------------------------- workers
@api.get("/workers")
def list_workers(swarm: str | None = None, type: str | None = None) -> list[WorkerStatus]:
now = clock().timestamp()
by_worker: dict[str, list[str]] = {}
for a in store.list_agents(swarm, type):
if a["worker"]:
by_worker.setdefault(a["worker"], []).append(a["name"])
return [
worker_status(w, by_worker.get(w["id"], []), now)
for w in store.list_workers(swarm, type)
]
def worker_or_404(worker_id: str) -> Row:
w = store.get_worker(worker_id)
if w is None:
raise HTTPException(404, f"no worker {worker_id!r}")
return w
@api.get("/workers/{worker_id}")
def get_worker(worker_id: str) -> WorkerStatus:
w = worker_or_404(worker_id)
names = [a["name"] for a in store.list_agents(worker=worker_id)]
return worker_status(w, names, clock().timestamp())
def stale(w: Row, incarnation: str | None) -> bool:
"""The caller is not the slot's current job. Workers that send no incarnation (older
versions) are trusted, as before."""
return incarnation is not None and w["incarnation"] != incarnation
@api.get("/workers/{worker_id}/commands")
async def commands(worker_id: str, wait: float = 25, incarnation: str | None = None):
if stale(worker_or_404(worker_id), incarnation):
raise HTTPException(409, "worker incarnation is not the slot's current job")
def check():
w = store.get_worker(worker_id)
if w is None or stale(w, incarnation):
return "stale" # replaced while this poll was parked: never hand it commands
if w["job_id"] is None:
return None # slot has no live job (stale process): give it nothing
cmds = store.commands_for(worker_id)
# A draining worker starts no turns; its prompts wait for the replacement job.
draining = w["draining"] or w["retire_at"]
prompts = [] if draining else store.prompts_for_worker(worker_id)
return (cmds, prompts) if cmds or prompts else None
found = await notifier.long_poll(f"commands:{worker_id}", check, wait)
if found == "stale":
raise HTTPException(409, "worker incarnation is not the slot's current job")
if not found:
return CommandBatch(commands=[])
cmds, prompts = found
batch = CommandBatch(
commands=[_COMMAND.validate_json(c["body"]) for c in cmds]
+ [PromptCommand.model_validate_json(p["body"]) for p in prompts]
)
def ack() -> None: # at-least-once: forget them only after the response went out
store.delete_commands([c["id"] for c in cmds])
store.delete_prompts([p["id"] for p in prompts])
return JSONResponse(batch.model_dump(mode="json"), background=BackgroundTask(ack))
@api.post("/workers/{worker_id}/heartbeat")
def heartbeat(worker_id: str, hb: WorkerHeartbeat, incarnation: str | None = None) -> dict:
if stale(worker_or_404(worker_id), incarnation):
raise HTTPException(409, "worker incarnation is not the slot's current job")
if hb.worker != worker_id:
raise HTTPException(400, "heartbeat worker does not match the path")
if not record_heartbeat(store, worker_id, hb, clock()):
raise HTTPException(409, "worker slot has no live job")
return {"ok": True}
@api.post("/workers/{worker_id}/events")
def post_events(worker_id: str, batch: EventBatch) -> dict:
w = worker_or_404(worker_id)
grouped: dict[str, list] = {}
for ev in batch.events:
grouped.setdefault(ev.agent, []).append(ev)
for agent, evs in grouped.items():
a = store.get_agent(agent)
store.append_events(a["swarm"] if a else w["swarm"], agent, evs)
return {"ok": True, "accepted": len(batch.events)}
app.include_router(api)
return app
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