Thermograph monorepo: graded-climate API + SSR frontend + infra, domain-specific containerized deploys
9eecfc8eef
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Ports frontend/ (Jinja2/FastAPI, ~1180 LOC) to Go with html/template. No climate math, no DB, no auth here -- every route fetches from the backend's /content/* API, so this is I/O-bound glue with no hard-porting wall; the risk was always in reproducing the rendering exactly, not the language. Verified with a golden-HTML diff, not just unit tests: both the Python original and the Go rewrite were run against the same committed fixtures (frontend/tests/fixtures/) and every one of the 11 routes compared byte-for-byte. The only surviving differences after that process are insignificant inter-tag whitespace and one attribute where Go's stricter escaper HTML-encodes an apostrophe Jinja left literal (functionally identical in every browser) -- confirmed programmatically by normalizing whitespace and unescaping before diffing, not by eyeballing. That process caught defects unit tests alone would have missed, because map[string]any has no compile-time field check: - Render-context keys were snake_case throughout (content.py's Jinja convention, ported verbatim) while the templates -- written independently -- read PascalCase fields. A missing map key doesn't error in html/template, it silently renders empty, so this was invisible in every status code and every "it built" signal: title, meta description, canonical URL, OpenGraph tags, the homepage's entire ranked list, and the brand-tag/nav-active state were all blank across every page. Fixed by renaming every key to match each template's own header comment (the authoritative per-page field contract) and, where an API struct's exported fields already matched what a template needed (contentapi.CityInfo, Crumb, HomeRanked, HubCountry, ...), passing the struct straight through instead of hand-rewrapping it in a map -- removes a whole layer of future drift risk, not just this instance of it. - Three pages 500'd outright: `.ToolHref` needed a fully-composed href string, not the bare "lat,lon" fragment the handlers were building; the all-time-records table needed the raw contentapi.AllTimeRecords struct, not a re-wrapped map. - JSON-LD was being double-encoded: `<script type="application/ld+json">` is JAVASCRIPT context to html/template's contextual escaper regardless of the script's `type` attribute, so a template.HTML-typed value placed there gets re-escaped as a quoted JS string instead of emitted raw -- the entire structured-data payload shipped as a JSON string containing JSON, which no crawler would parse as the intended object. Needed template.JS instead, the type that actually means "trusted JS source." The glossary term page's JSON-LD was simply never built at all (the Jinja original assembled it inline in the template rather than through content.py's context dict, and that got lost in translation) -- added. - html/template silently strips literal HTML comments AND JavaScript comments from the parsed output (verified in isolation, zero template actions involved) -- confirmed as real engine behavior, not a bug in either port, so both need a FuncMap function returning template.HTML / template.JS respectively to survive parsing rather than a literal `<!-- -->` or `//` in the template source. Packaging: multi-stage Go build, final image alpine (not distroless -- the Swarm stack's env-entrypoint.sh shim needs bash), 187MB -> 22.6MB. Two defects caught before they reached a host: - The Swarm stack overrides `entrypoint:` with no `command:`, which drops the image's own CMD entirely (Docker/Swarm semantics, not merged) -- env-entrypoint.sh then fell through to its hardcoded `exec uvicorn app:app` fallback, which doesn't exist in this image. Every deploy would have exited 127. Fixed with an explicit `command:` on the stack's frontend service, and corrected the shim's stale comment claiming CMD passes through automatically. - `COPY --chown=thermograph` resolves the group by NAME at copy time; Alpine's `adduser -S` with no `-G` doesn't create a same-named group, so the classic (non-BuildKit) Docker builder -- which this CI runner falls back to, since it installs plain `docker.io` with no buildx plugin -- failed outright. Fixed with an explicit group and numeric --chown. Verification: go build/vet/test -race clean across all packages; the Docker image builds and passes its embedded go test step under both BuildKit and the classic builder; shellcheck 0 findings on the one script touched; rebased onto current main (the ERA5 lake stack landed on both main and dev during this work -- confirmed additive, no overlap with frontend/daemon). |
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|---|---|---|
| .forgejo/workflows | ||
| backend | ||
| frontend | ||
| infra | ||
| observability | ||
| CLAUDE.md | ||
| CUTOVER-NOTES.md | ||
| README.md | ||
thermograph
The Thermograph monorepo — the split repos reunified (2026-07-22) with full history via subtree merges, while keeping everything the split was actually for: per-domain images, per-domain deploys, and an async FE/BE contract.
Domains
| Dir | What | CI |
|---|---|---|
backend/ |
FastAPI graded-climate API, accounts, notifications (Discord bot, push, mail), data pipeline | backend-build-push → image emi/thermograph/backend; backend-deploy[-prod|-dev] |
frontend/ |
Public client: static JS/CSS + SSR pages | frontend-* mirrors of the above; image emi/thermograph/frontend |
infra/ |
Compose, deploy scripts, terraform, SOPS secrets vault, ops cron | infra-sync (host checkout + secrets render), secrets-guard, ops-cron |
observability/ |
Loki + Grafana + Alloy stack | observability-validate |
thermograph-docs deliberately stays its own repo (ADRs + runbooks, no
build artifacts, different change cadence).
How CI stays decoupled
Every workflow in .forgejo/workflows/ is path-filtered to its domain: a
push touching only frontend/** builds/deploys nothing else. Images stay
separate (emi/thermograph/backend, emi/thermograph/frontend, each tagged
sha-<12hex>), deploys stay per-service (infra/deploy/deploy.sh SERVICE=backend|frontend|all), and the API version contract
(GET /api/version, PAYLOAD_VER) still lets FE and BE ship out of lockstep.
The one intentionally coupled piece is pr-build.yml: a single always-running
gate required check that builds only the domains a PR touches (a
path-filtered required check would deadlock auto-merge).
Branch model (unchanged from the split era): PRs → dev, main → beta,
release → prod; infra tracked via main on all hosts.
Before pointing anything live at this repo, read CUTOVER-NOTES.md.