Carousell new-listing monitor: NocoDB archive + Telegram alerts

.dockerignore

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+.git
+.gitignore
+.env
+.env.example
+__pycache__
+*.pyc
+*.md
+SECRETS.md
+docker-compose.yml

.env.example

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+# Copy to .env and fill in. All values are required.
+
+# NocoDB (container DNS when on bridge_hoelee; LAN IP from a desktop):
+NOCODB_URL=http://nocodb:10380
+NOCODB_BASE_ID=poqw1zjw3hnsk37
+NOCODB_TOKEN=
+
+# Telegram alerts (@HoeleeAgentBot):
+TELEGRAM_BOT_TOKEN=
+TELEGRAM_CHAT_ID=5648309582
+
+# Optional tuning:
+TICK_SECONDS=60
+HEALTH_STALE_SECONDS=600

.gitignore

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+.env
+__pycache__/
+*.pyc
+.DS_Store

AGENTS.md

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+# AGENTS.md
+
+Project: Carousell new-listing monitor (Python stdlib, Docker, NocoDB, Telegram).
+
+## What it does
+
+`monitor.py` polls Carousell search URLs (sort_by=3 = recent), extracts listings
+from the server-rendered `<script type="application/json">` Redux state
+(`SearchListing.listingCards`), dedupes by `product_url` (param-less), archives to a
+NocoDB base, and alerts Telegram `"<title>: N new listings"`. Runs 24/7 as a Docker
+container on DSM (network `bridge_hoelee`, reaches NocoDB at `http://nocodb:10380`).
+
+## Iron rules
+
+- Secrets NEVER in code or compose — only env vars / `SECRETS.md` (private repo).
+  Operational knobs (`enabled` / `notify` / `check_interval_minutes`) live in the
+  NocoDB **Settings** table, adjustable from the UI without redeploy.
+- Dedupe key is `product_url` (`https://www.carousell.com.my/p/<id>/`), not the raw
+  listing id and never the query-string URL.
+- First run per watch seeds the archive with **no** Telegram alert (`last_checked_at`
+  null == unseeded).
+- Docker HEALTHCHECK: container is unhealthy if the last tick is >10 min old or the
+  last run had a failure (failed extract / 403 / rate-limit).
+- Image thumbnail: `image` Attachment field stores the remote URL (NocoDB hotlinks
+  it — media.karousell.com is GCS-backed, `Access-Control-Allow-Origin: *`). The raw
+  URL is also kept in `image_url`.
+
+## Verified facts (2026-09-02)
+
+- Carousell search page: 1.6 MB HTML, state blob ~1.27 MB, ~49 `listingCards` per
+  load. Card fields: `listingID`, `title`, `price` (e.g. "RM85"), `thumbnailURL`,
+  `seller.username`, `aboveFold[time_created].timestampContent.seconds.low`,
+  `belowFold` paragraphs where `paragraph[1]` = condition (Like new/Brand new/...).
+- `https://www.carousell.com.my/p/<id>/` 301-redirects to the canonical slug URL.
+- NocoDB instance: DSM `http://192.168.137.2:10380` (IP drifts; container DNS
+  `nocodb:10380` on bridge_hoelee). Base `Carousell` = `poqw1zjw3hnsk37`.
+  Workspace token in SECRETS.md. v2 API: records use column *titles* as JSON keys;
+  Attachment field accepts a JSON string `[{"path","mimetype","title"}]` and keeps the
+  remote URL (does not re-host).
+
+## Build / deploy
+
+```bash
+docker build -t hoelee/carousell-monitor:latest .
+docker push hoelee/carousell-monitor:latest
+# then Portainer stack from /volume1/docker/carousell-monitor/docker-compose.yml
+```

Dockerfile

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+FROM python:3.11-alpine
+
+WORKDIR /app
+COPY monitor.py healthcheck.py /app/
+RUN mkdir -p /data
+
+VOLUME ["/data"]
+
+HEALTHCHECK --interval=60s --timeout=15s --start-period=120s --retries=3 \
+  CMD python /app/healthcheck.py
+
+CMD ["python", "-u", "/app/monitor.py"]

README.md

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+# carousell-monitor
+
+Watches Carousell search pages (sorted by *recent*) for new listings, archives every
+listing to a NocoDB base (with image URL + thumbnail), and alerts Telegram.
+
+## How it works
+
+- `monitor.py` runs in a Docker container on DSM, self-bootstrapping its NocoDB
+  schema (`Listings` + `Settings` tables) and looping forever.
+- Every `TICK_SECONDS` it reads the watch list from the **Settings** table and polls
+  each enabled watch's URL on its own `check_interval_minutes`.
+- Dedupe key = `product_url` (param-less listing URL). First run per watch = seed
+  archive only (no Telegram). After that, new listings are archived and alerted as
+  `"<title>: N new listings"`.
+- The container marks itself **unhealthy** (Docker healthcheck) if a tick fails to
+  extract / gets rate-limited / crashes.
+
+## Schema
+
+**Listings** — `product_url` (unique), `title`, `price` (numeric), `condition`
+(SingleSelect), `image_url`, `image` (Attachment → thumbnail), `seller_name`,
+`seller_url`, `search_title`, `search_url`, `listed_at`, `first_seen_at`.
+
+**Settings** — `title`, `url`, `enabled`, `notify`, `check_interval_minutes`,
+`last_checked_at`. Add/remove watches here from the NocoDB UI; no redeploy needed.
+
+## Run
+
+```bash
+# local (against LAN NocoDB)
+NOCODB_URL=http://192.168.137.2:10380 \
+NOCODB_TOKEN=... TELEGRAM_BOT_TOKEN=... TELEGRAM_CHAT_ID=... \
+python monitor.py
+
+# docker
+docker build -t hoelee/carousell-monitor:latest .
+docker compose up -d
+```
+
+## Deploy (DSM via Portainer)
+
+Image pushed to Docker Hub `hoelee/carousell-monitor:latest`; the compose at
+`/volume1/docker/carousell-monitor` is deployed as a Portainer stack with the
+secrets passed as stack environment variables.
+
+## Files
+
+- `monitor.py` — main loop, schema bootstrap, fetch/parse, NocoDB IO, Telegram.
+- `healthcheck.py` — Docker HEALTHCHECK probe (`/data/health.json`).
+- `Dockerfile`, `docker-compose.yml`, `.env.example`.
+- `AGENTS.md` — AI-agent entry. `SECRETS.md` — credentials (private repo).

SECRETS.md

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+# SECRETS.md — credentials (private repo only)
+
+| Var | Value / source |
+|---|---|
+| `NOCODB_URL` | `http://nocodb:10380` (container DNS on bridge_hoelee) · `http://192.168.137.2:10380` (LAN) |
+| `NOCODB_BASE_ID` | `poqw1zjw3hnsk37` (base "Carousell") |
+| `NOCODB_TOKEN` | `nc_pat_mDk7f6t4ZMAYYzv9GDrQvKpSr4oFZyiStxf0wxlL` (workspace-scoped, originally created for alist-serve-resource) |
+| `TELEGRAM_BOT_TOKEN` | @HoeleeAgentBot token — lives in `%LOCALAPPDATA%\hermes\.env` (`TELEGRAM_BOT_TOKEN=`) |
+| `TELEGRAM_CHAT_ID` | `5648309582` |

docker-compose.yml

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+# Carousell new-listing monitor -> NocoDB archive + Telegram alerts.
+# Deployed via Portainer on DSM. Secrets come from the stack's environment
+# (see .env.example); operational knobs (enabled / notify / interval) live in
+# the NocoDB "Settings" table.
+
+services:
+  carousell-monitor:
+    image: hoelee/carousell-monitor:latest
+    container_name: carousell-monitor
+    restart: unless-stopped
+    environment:
+      NOCODB_URL: ${NOCODB_URL:-http://nocodb:10380}
+      NOCODB_TOKEN: ${NOCODB_TOKEN}
+      NOCODB_BASE_ID: ${NOCODB_BASE_ID:-poqw1zjw3hnsk37}
+      TELEGRAM_BOT_TOKEN: ${TELEGRAM_BOT_TOKEN}
+      TELEGRAM_CHAT_ID: ${TELEGRAM_CHAT_ID}
+      TICK_SECONDS: ${TICK_SECONDS:-60}
+      HEALTH_STALE_SECONDS: ${HEALTH_STALE_SECONDS:-600}
+      TZ: Asia/Kuala_Lumpur
+    volumes:
+      - carousell-data:/data
+    networks:
+      - bridge_hoelee
+
+volumes:
+  carousell-data:
+
+networks:
+  bridge_hoelee:
+    external: true

healthcheck.py

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+#!/usr/bin/env python3
+"""Docker HEALTHCHECK: healthy iff a tick ran recently AND the last run was ok."""
+import json
+import os
+import sys
+import time
+
+DATA_DIR = os.environ.get("DATA_DIR", "/data")
+STALE = int(os.environ.get("HEALTH_STALE_SECONDS", "600"))
+
+try:
+    with open(os.path.join(DATA_DIR, "health.json"), encoding="utf-8") as f:
+        h = json.load(f)
+    age = time.time() - int(h.get("last_run_epoch", 0))
+    if age <= STALE and h.get("ok") is True:
+        sys.exit(0)
+except Exception:
+    pass
+sys.exit(1)

monitor.py

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+#!/usr/bin/env python3
+"""Carousell new-listing monitor -> NocoDB archive + Telegram alerts.
+
+Self-bootstrapping: on startup it ensures the NocoDB schema (Listings + Settings
+tables) exists, then loops forever. Each tick it reads the watch list from the
+Settings table, polls each enabled watch's Carousell search URL on its own
+interval, dedupes by product_url (param-less listing URL), archives every listing
+to NocoDB (title, numeric price, condition, image URL + thumbnail attachment,
+seller, link, timestamps), and — after the first seed — alerts Telegram with
+"<title>: N new listing(s)".
+
+Secrets via env vars; operational knobs (enabled / notify / interval) live in the
+NocoDB Settings table so they're adjustable from the UI without a redeploy.
+
+Writes /data/health.json every tick; the Docker HEALTHCHECK flags the container
+unhealthy on any failed extract / rate-limit / crash.
+
+Stdlib only.
+"""
+import json
+import os
+import re
+import sys
+import time
+import urllib.error
+import urllib.parse
+import urllib.request
+
+# --------------------------------------------------------------------------- #
+# Config (env)
+# --------------------------------------------------------------------------- #
+NOCODB_URL = os.environ.get("NOCODB_URL", "http://nocodb:10380").rstrip("/")
+NOCODB_TOKEN = os.environ.get("NOCODB_TOKEN", "")
+NOCODB_BASE_ID = os.environ.get("NOCODB_BASE_ID", "poqw1zjw3hnsk37")
+TELEGRAM_BOT_TOKEN = os.environ.get("TELEGRAM_BOT_TOKEN", "")
+TELEGRAM_CHAT_ID = os.environ.get("TELEGRAM_CHAT_ID", "")
+DATA_DIR = os.environ.get("DATA_DIR", "/data")
+TICK_SECONDS = int(os.environ.get("TICK_SECONDS", "60"))
+HEALTH_STALE_SECONDS = int(os.environ.get("HEALTH_STALE_SECONDS", "600"))
+DEFAULT_INTERVAL_MIN = int(os.environ.get("DEFAULT_INTERVAL_MIN", "5"))
+
+UA = ("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
+      "(KHTML, like Gecko) Chrome/120.0 Safari/537.36")
+
+CONDITIONS = ["Brand new", "Like new", "Lightly used", "Well used", "Heavily used"]
+PRODUCT_URL_TMPL = "https://www.carousell.com.my/p/{listing_id}/"
+SELLER_URL_TMPL = "https://www.carousell.com.my/u/{username}/"
+
+# Column definitions: table title -> list of (title, uidt)
+LISTINGS_COLS = [
+    ("product_url", "URL"),
+    ("title", "SingleLineText"),
+    ("price", "Decimal"),
+    ("condition", "SingleSelect"),   # options set via 2-pass below
+    ("image_url", "URL"),
+    ("image", "Attachment"),
+    ("seller_name", "SingleLineText"),
+    ("seller_url", "URL"),
+    ("search_title", "SingleLineText"),
+    ("search_url", "URL"),
+    ("listed_at", "DateTime"),
+    ("first_seen_at", "DateTime"),
+]
+SETTINGS_COLS = [
+    ("title", "SingleLineText"),
+    ("url", "URL"),
+    ("enabled", "Checkbox"),
+    ("notify", "Checkbox"),
+    ("check_interval_minutes", "Number"),
+    ("last_checked_at", "DateTime"),
+]
+
+
+# --------------------------------------------------------------------------- #
+# HTTP helpers
+# --------------------------------------------------------------------------- #
+def _http(method, url, body=None, headers=None, timeout=30):
+    h = {"User-Agent": UA}
+    if headers:
+        h.update(headers)
+    data = None
+    if body is not None:
+        data = json.dumps(body).encode("utf-8")
+        h["Content-Type"] = "application/json"
+    req = urllib.request.Request(url, data=data, method=method, headers=h)
+    with urllib.request.urlopen(req, timeout=timeout) as r:
+        raw = r.read().decode("utf-8", errors="ignore")
+        return r.status, raw
+
+
+def _json(status_raw):
+    status, raw = status_raw
+    return status, (json.loads(raw) if raw else None)
+
+
+def nc(method, path, body=None):
+    return _json(_http(method, f"{NOCODB_URL}{path}", body=body,
+                       headers={"xc-token": NOCODB_TOKEN}))
+
+
+def tg(method, payload):
+    return _json(_http(
+        method, f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/{method}",
+        body=payload))
+
+
+# --------------------------------------------------------------------------- #
+# Schema bootstrap (idempotent)
+# --------------------------------------------------------------------------- #
+def _ensure_table(title, cols):
+    st, tables = nc("GET", f"/api/v2/meta/bases/{NOCODB_BASE_ID}/tables")
+    if st != 200:
+        raise RuntimeError(f"list tables failed: {tables}")
+    tid = None
+    for t in tables.get("list", []):
+        if t.get("title") == title:
+            tid = t["id"]
+    if tid is None:
+        # NocoDB requires >=1 column inline on create; seed with the first.
+        st, out = nc("POST", f"/api/v2/meta/bases/{NOCODB_BASE_ID}/tables",
+                     {"title": title, "table_name": title, "type": "table",
+                      "columns": [{"title": cols[0][0], "uidt": cols[0][1]}]})
+        if st != 200:
+            raise RuntimeError(f"create table {title} failed: {out}")
+        tid = out["id"]
+
+    def _columns_by_title():
+        st, meta = nc("GET", f"/api/v2/meta/tables/{tid}")
+        return {c.get("title"): c for c in meta.get("columns", [])}
+
+    existing = _columns_by_title()
+    for (ctitle, uidt) in cols:
+        if ctitle in existing:
+            continue
+        st, out = nc("POST", f"/api/v2/meta/tables/{tid}/columns",
+                     {"title": ctitle, "uidt": uidt})
+        if st != 200:
+            raise RuntimeError(f"add column {ctitle} failed: {out}")
+
+    # SingleSelect options. Re-read meta for authoritative column ids: POST
+    # /columns returns the *table* object, not the column id.
+    existing = _columns_by_title()
+    for (ctitle, uidt) in cols:
+        if uidt != "SingleSelect" or ctitle not in existing:
+            continue
+        col = existing[ctitle]
+        opts = col.get("colOptions", {}).get("options") or []
+        if len(opts) >= len(CONDITIONS):
+            continue
+        opt_list = [{"title": c, "order": i + 1, "color": None}
+                    for i, c in enumerate(CONDITIONS)]
+        st, out = nc("PATCH", f"/api/v2/meta/columns/{col['id']}",
+                     {"colOptions": {"options": opt_list},
+                      "dtxp": ",".join(CONDITIONS)})
+        if st != 200:
+            raise RuntimeError(f"patch SingleSelect {ctitle} failed: {out}")
+
+    return tid
+
+
+def bootstrap():
+    listings_tid = _ensure_table("Listings", LISTINGS_COLS)
+    settings_tid = _ensure_table("Settings", SETTINGS_COLS)
+    return listings_tid, settings_tid
+
+
+# --------------------------------------------------------------------------- #
+# Carousell extraction
+# --------------------------------------------------------------------------- #
+def fetch_listings(search_url):
+    st, html = _http("GET", search_url)
+    if st != 200:
+        raise RuntimeError(f"carousell fetch HTTP {st}")
+    blobs = re.findall(r'<script type="application/json">(.*?)</script>',
+                       html, re.S)
+    if not blobs:
+        raise RuntimeError("no application/json state found (blocked/ratelimited?)")
+    state = json.loads(max(blobs, key=len))
+    cards = state["SearchListing"]["listingCards"]
+    out = []
+    for c in cards:
+        try:
+            lid = int(c["listingID"])
+            ts = None
+            for item in c.get("aboveFold", []):
+                if item.get("component") == "time_created":
+                    ts = item["timestampContent"]["seconds"]["low"]
+                    break
+            bf = c.get("belowFold", [])
+            title = next((i["stringContent"] for i in bf
+                          if i.get("component") == "header_1"), "")
+            price_raw = next((i["stringContent"] for i in bf
+                              if i.get("component") == "header_2"), "")
+            paras = [i.get("stringContent", "") for i in bf
+                     if i.get("component") == "paragraph"]
+            cond = paras[1].strip() if len(paras) > 1 else ""
+            if cond not in CONDITIONS:
+                cond = ""
+            thumb = c.get("thumbnailURL", "")
+            seller = (c.get("seller") or {}).get("username", "")
+            out.append({
+                "listing_id": lid,
+                "title": title,
+                "price": price_raw,
+                "condition": cond,
+                "thumbnail": thumb,
+                "seller": seller,
+                "ts": ts,
+            })
+        except (KeyError, TypeError, ValueError):
+            continue
+    return out
+
+
+def parse_price(s):
+    if not s:
+        return None
+    t = re.sub(r"[^0-9.]", "", s)
+    if not t:
+        return None
+    try:
+        return round(float(t), 2)
+    except ValueError:
+        return None
+
+
+def mimetype_for(url):
+    p = url.lower()
+    if ".png" in p:
+        return "image/png"
+    if ".webp" in p:
+        return "image/webp"
+    if ".gif" in p:
+        return "image/gif"
+    return "image/jpeg"
+
+
+def iso_now():
+    # UTC: NocoDB parses naive datetimes as UTC.
+    return time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime())
+
+
+def iso_from_epoch(epoch):
+    if not epoch:
+        return None
+    return time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(epoch))
+
+
+# --------------------------------------------------------------------------- #
+# NocoDB row IO
+# --------------------------------------------------------------------------- #
+def load_seen(listings_tid):
+    seen = set()
+    limit, offset = 1000, 0
+    while True:
+        st, j = nc("GET", f"/api/v2/tables/{listings_tid}/records"
+                   f"?limit={limit}&offset={offset}")
+        if st != 200:
+            raise RuntimeError(f"load seen failed: {j}")
+        lst = j.get("list", [])
+        for r in lst:
+            if r.get("product_url"):
+                seen.add(r["product_url"])
+        if len(lst) < limit:
+            break
+        offset += limit
+    return seen
+
+
+def load_watches(settings_tid):
+    st, j = nc("GET", f"/api/v2/tables/{settings_tid}/records?limit=1000")
+    if st != 200:
+        raise RuntimeError(f"load watches failed: {j}")
+    watches = []
+    for r in j.get("list", []):
+        if r.get("enabled"):
+            watches.append(r)
+    return watches
+
+
+def insert_listings(listings_tid, rows):
+    if not rows:
+        return
+    st, out = nc("POST", f"/api/v2/tables/{listings_tid}/records", rows)
+    if st != 200:
+        raise RuntimeError(f"insert listings failed: {out}")
+
+
+def update_checked(settings_tid, watch_id):
+    nc("PATCH", f"/api/v2/tables/{settings_tid}/records",
+       [{"Id": watch_id, "last_checked_at": iso_now()}])
+
+
+def build_row(l, watch):
+    row = {
+        "product_url": PRODUCT_URL_TMPL.format(listing_id=l["listing_id"]),
+        "title": l["title"],
+        "image_url": l["thumbnail"],
+        "image": json.dumps([{"path": l["thumbnail"],
+                              "mimetype": mimetype_for(l["thumbnail"]),
+                              "title": f"{l['listing_id']}.jpg"}]),
+        "seller_name": l["seller"],
+        "seller_url": SELLER_URL_TMPL.format(username=l["seller"]),
+        "search_title": watch.get("title", ""),
+        "search_url": watch.get("url", ""),
+        "first_seen_at": iso_now(),
+    }
+    price = parse_price(l["price"])
+    if price is not None:
+        row["price"] = price
+    if l["condition"]:
+        row["condition"] = l["condition"]
+    listed = iso_from_epoch(l["ts"])
+    if listed:
+        row["listed_at"] = listed
+    return row
+
+
+# --------------------------------------------------------------------------- #
+# Telegram
+# --------------------------------------------------------------------------- #
+def send_telegram(text):
+    if not TELEGRAM_BOT_TOKEN or not TELEGRAM_CHAT_ID:
+        return
+    try:
+        tg("sendMessage", {"chat_id": TELEGRAM_CHAT_ID, "text": text})
+    except urllib.error.HTTPError as e:
+        sys.stderr.write(f"telegram send failed: {e.code} {e.read()[:200]}\n")
+
+
+def plural(n, word):
+    return f"{n} {word}{'' if n == 1 else 's'}"
+
+
+# --------------------------------------------------------------------------- #
+# Health
+# --------------------------------------------------------------------------- #
+def write_health(ok, error, extra=None):
+    os.makedirs(DATA_DIR, exist_ok=True)
+    h = {"last_run_epoch": int(time.time()), "ok": ok, "error": error or ""}
+    if extra:
+        h.update(extra)
+    tmp = os.path.join(DATA_DIR, "health.json.tmp")
+    with open(tmp, "w", encoding="utf-8") as f:
+        json.dump(h, f)
+    os.replace(tmp, os.path.join(DATA_DIR, "health.json"))
+
+
+# --------------------------------------------------------------------------- #
+# Main loop
+# --------------------------------------------------------------------------- #
+def run_tick(listings_tid, settings_tid, seen, last_run):
+    failures = []
+    new_total = 0
+    watches = load_watches(settings_tid)
+    now = time.time()
+
+    for w in watches:
+        wid = w.get("Id")
+        interval_min = w.get("check_interval_minutes") or DEFAULT_INTERVAL_MIN
+        interval_sec = max(int(interval_min), 1) * 60
+        if wid in last_run and (now - last_run[wid]) < interval_sec:
+            continue
+
+        try:
+            listings = fetch_listings(w.get("url", ""))
+        except Exception as e:
+            failures.append(f"{w.get('title')}: {e}")
+            # still advance so a hard-failing watch doesn't hammer every tick
+            last_run[wid] = now
+            continue
+
+        first_seed = not w.get("last_checked_at")
+        fresh = [l for l in listings
+                 if PRODUCT_URL_TMPL.format(listing_id=l["listing_id"]) not in seen]
+
+        rows = [build_row(l, w) for l in fresh]
+        if rows:
+            insert_listings(listings_tid, rows)
+            for l in fresh:
+                seen.add(PRODUCT_URL_TMPL.format(listing_id=l["listing_id"]))
+
+        if fresh and not first_seed and w.get("notify", True):
+            send_telegram(f"{w.get('title')}: {plural(len(fresh), 'new listing')}")
+
+        new_total += len(fresh)
+        update_checked(settings_tid, wid)
+        last_run[wid] = now
+
+    ok = len(failures) == 0
+    return ok, ("; ".join(failures) if failures else ""), {
+        "watch_count": len(watches), "new_this_tick": new_total}
+
+
+def main():
+    if not NOCODB_TOKEN:
+        sys.stderr.write("NOCODB_TOKEN not set\n")
+        write_health(False, "NOCODB_TOKEN not set")
+        sys.exit(2)
+
+    listings_tid, settings_tid = bootstrap()
+    seen = load_seen(listings_tid)
+    last_run = {}
+
+    sys.stderr.write(f"ready: listings={listings_tid} settings={settings_tid} "
+                     f"seen={len(seen)}\n")
+
+    while True:
+        try:
+            ok, err, extra = run_tick(listings_tid, settings_tid, seen, last_run)
+        except Exception as e:
+            ok, err, extra = False, f"tick error: {e}", {}
+        write_health(ok, err, extra)
+        time.sleep(TICK_SECONDS)
+
+
+if __name__ == "__main__":
+    main()