feat(image-render): flux (ComfyUI 로컬) provider + GPU 장중 가드

services/image-render/providers/flux.py

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+"""FLUX 로컬 — ComfyUI HTTP API.
+
+POST {COMFYUI_URL}/prompt  (workflow JSON) → prompt_id
+GET  {COMFYUI_URL}/history/{prompt_id} → outputs → image filename
+GET  {COMFYUI_URL}/view?filename=... → PNG bytes → b64
+
+워크플로우 JSON은 `flux_workflow.json` (ComfyUI UI에서 "Save (API Format)"로 export, CLIPTextEncode 노드 text를 "%PROMPT%"로 수동 치환). 박재오 산출물.
+"""
+from __future__ import annotations
+
+import base64, json, logging, os, time
+from datetime import datetime, timezone, timedelta
+import requests
+
+from nas_client import webhook_update_task
+from providers._media import save_b64_png
+
+logger = logging.getLogger(__name__)
+COMFYUI_URL = os.getenv("COMFYUI_URL", "http://127.0.0.1:8188")
+WORKFLOW_PATH = os.path.join(os.path.dirname(__file__), "flux_workflow.json")
+POLL_INTERVAL = 2
+POLL_MAX = 120
+
+
+def _is_trading_hours() -> bool:
+    kst = timezone(timedelta(hours=9))
+    now = datetime.now(kst)
+    if now.weekday() >= 5:
+        return False
+    return (now.hour, now.minute) >= (9, 0) and (now.hour, now.minute) <= (15, 30)
+
+
+def _load_workflow(prompt: str, size: str) -> dict:
+    with open(WORKFLOW_PATH, encoding="utf-8") as f:
+        wf = json.load(f)
+    # CLIPTextEncode 노드의 text를 prompt로 치환 (workflow에 "%PROMPT%" placeholder 사용)
+    raw = json.dumps(wf).replace("%PROMPT%", prompt.replace('"', "'"))
+    return json.loads(raw)
+
+
+def _submit_prompt(workflow: dict) -> str:
+    r = requests.post(f"{COMFYUI_URL}/prompt", json={"prompt": workflow}, timeout=30)
+    r.raise_for_status()
+    return r.json()["prompt_id"]
+
+
+def _poll_image_b64(prompt_id: str):
+    for _ in range(POLL_MAX):
+        h = requests.get(f"{COMFYUI_URL}/history/{prompt_id}", timeout=10)
+        data = h.json().get(prompt_id)
+        if data and data.get("outputs"):
+            for node_out in data["outputs"].values():
+                for img in node_out.get("images", []):
+                    view = requests.get(f"{COMFYUI_URL}/view",
+                                        params={"filename": img["filename"], "subfolder": img.get("subfolder", ""), "type": img.get("type", "output")},
+                                        timeout=30)
+                    view.raise_for_status()
+                    return base64.b64encode(view.content).decode()
+        time.sleep(POLL_INTERVAL)
+    return None
+
+
+def run_flux_generation(task_id: str, params: dict) -> None:
+    try:
+        if os.getenv("FLUX_BLOCK_TRADING_HOURS") == "1" and _is_trading_hours():
+            webhook_update_task(task_id, "failed", 0, "", error="장중 GPU 보호 — FLUX 거부 (API provider 사용 권장)")
+            return
+        webhook_update_task(task_id, "processing", 10, "FLUX (ComfyUI) 생성 중...")
+        wf = _load_workflow(params["prompt"], params.get("size") or "1024x1024")
+        pid = _submit_prompt(wf)
+        b64 = _poll_image_b64(pid)
+        if not b64:
+            webhook_update_task(task_id, "failed", 0, "", error="ComfyUI 타임아웃 또는 출력 없음")
+            return
+        url = save_b64_png(task_id, b64)
+        webhook_update_task(task_id, "succeeded", 100, "완료", image_url=url)
+    except Exception as e:
+        logger.exception("flux task=%s 실패", task_id)
+        webhook_update_task(task_id, "failed", 0, "", error=str(e))

services/image-render/tests/test_flux.py

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+import providers.flux as fx
+
+def test_blocked_during_trading_hours(monkeypatch):
+    monkeypatch.setenv("FLUX_BLOCK_TRADING_HOURS", "1")
+    monkeypatch.setattr(fx, "_is_trading_hours", lambda: True)
+    calls = []
+    monkeypatch.setattr(fx, "webhook_update_task", lambda *a, **k: calls.append((a, k)))
+    fx.run_flux_generation("t1", {"prompt": "a cat"})
+    assert calls[-1][0][1] == "failed"
+    assert "장중" in calls[-1][1]["error"]
+
+def test_success_polls_history_and_saves(monkeypatch):
+    monkeypatch.setattr(fx, "_is_trading_hours", lambda: False)
+    calls = []
+    monkeypatch.setattr(fx, "webhook_update_task", lambda *a, **k: calls.append((a, k)))
+    monkeypatch.setattr(fx, "_load_workflow", lambda prompt, size: {"3": {}})
+    monkeypatch.setattr(fx, "_submit_prompt", lambda wf: "pid-1")
+    monkeypatch.setattr(fx, "_poll_image_b64", lambda pid: "ZmFrZQ==")
+    monkeypatch.setattr(fx, "save_b64_png", lambda tid, b64: "/media/image/t1.png")
+    fx.run_flux_generation("t1", {"prompt": "a cat"})
+    assert [c for c in calls if c[0][1] == "succeeded"]