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The gateway bot and APScheduler were long-lived stateful I/O loops running inside the async web app under a leader election. They move into a single Go binary that owns ONLY that I/O -- websocket, RESUME, heartbeat, backoff, timers. It owns no grading logic. Anything needing data calls back over a new internal-only surface (/internal/discord/grade, /internal/jobs/*). Grading depends on polars and the parquet cache; reimplementing it in Go would let the bot's grades drift from the API's. The grade route returns gateway-ready JSON and Go relays the bytes verbatim. The binary ships in the backend image and runs as a second compose service off the same tag, so the two ends of the /internal/* contract can never skew. deploy.sh rolls daemon alongside backend -- without that the service would never be created, since a single-service deploy uses --no-deps. It also probes the image first and skips the daemon when rolling a tag that predates the binary: infra tracks main while image tags are env-staged, so a host can legitimately be asked to roll an older backend image, and creating the service anyway would leave a container crash-looping on a missing binary. replicas: 1 with order: stop-first replaces the leader election -- Discord permits one gateway connection per bot token. THERMOGRAPH_INTERNAL_TOKEN is optional: both ends derive it from THERMOGRAPH_AUTH_SECRET via HMAC under a domain-separation label, so this needs no new vault entry. The derivation is pinned to a shared cross-language test vector asserted on both sides, so drift fails CI instead of 401ing every call. Fail closed when neither secret is set. Improvements over the Python: a close intended for RESUME uses 4000 rather than 1000 (Discord invalidates a session closed 1000, so the old default defeated its own resume); MESSAGE_CREATE runs on a bounded worker pool; and a malformed HELLO returns an error rather than a clean reconnect, which would otherwise reset backoff and hot-loop against the gateway. 365 Python tests pass; Go build/vet/test -race clean; shellcheck 0 findings. |
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|---|---|---|
| .. | ||
| internal | ||
| go.mod | ||
| go.sum | ||
| main.go | ||
| README.md | ||
thermograph-daemon
Single Go binary that owns the backend's long-lived stateful I/O: the Discord
gateway connection (IDENTIFY/RESUME/heartbeat/reconnect backoff) and the
recurring-job timers (warm-cities, IndexNow). It replaces the two in-process
background jobs web/app.py used to run under leader election — one daemon
replica makes the single-connection invariant a deployment fact instead of a
runtime election.
The Go/Python split
Go here owns no climate or grading logic. Grading depends on polars and the parquet cache, and the slash-command path deliberately shares one grade builder with the API so bot grades and API grades never drift. So anything data-shaped is a POST back into the Python app's internal-only routes:
| Route | Purpose |
|---|---|
POST /internal/discord/grade |
{"query": "phoenix"} → gateway-ready Discord message JSON, relayed to Discord verbatim |
POST /internal/jobs/warm-cities |
trigger the warm-cities job |
POST /internal/jobs/indexnow |
trigger the IndexNow check-and-submit |
Every request carries X-Thermograph-Internal-Token. Caddy never routes
/internal/* to the backend, so the token is defence in depth, not the only
control. If THERMOGRAPH_INTERNAL_TOKEN is unset, the Python side disables the
routes and this daemon refuses to start (fail closed on both ends).
Configuration (env)
| Var | Required | Meaning |
|---|---|---|
THERMOGRAPH_INTERNAL_TOKEN |
yes | shared secret for the internal routes |
THERMOGRAPH_API_BASE_INTERNAL |
yes | backend base URL, e.g. http://web:8137 |
THERMOGRAPH_DISCORD_BOT |
no | 1/true/yes/on enables the gateway |
THERMOGRAPH_DISCORD_BOT_TOKEN |
no | bot token (gateway stays off without it) |
THERMOGRAPH_WARM_CITIES_INTERVAL_HOURS |
no | default 24; malformed → default |
THERMOGRAPH_INDEXNOW_INTERVAL_HOURS |
no | default 6; malformed → default |
Run locally
cd backend/daemon
go build ./... && go vet ./... && go test ./...
THERMOGRAPH_INTERNAL_TOKEN=dev-token \
THERMOGRAPH_API_BASE_INTERNAL=http://localhost:8137 \
go run .
Deployed as /usr/local/bin/thermograph-daemon in the backend image.