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91 lines
4.2 KiB
Docker
91 lines
4.2 KiB
Docker
# Thermograph frontend: server-rendered content pages, the interactive tool's
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# SPA shells, and every static asset. Split from the monorepo (repo-split
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# Stage 7), rewritten as a Go service (server/). No migrations, no DB, no
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# pre-boot logic -- a plain exec-form CMD is enough (unlike backend, no
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# separate entrypoint script needed).
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#
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# Multi-stage: the golang builder runs vet + the full Go test suite before
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# building, so every published image provably passed the hermetic tier with
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# the exact toolchain that compiled the shipping binary (this replaces the
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# old in-image pytest step in .forgejo/workflows/build.yml -- the runtime
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# image carries no toolchain to test with). The final stage is Alpine, not
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# distroless: the Swarm stack (infra/deploy/stack/thermograph-stack.yml)
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# bind-mounts a bash entrypoint shim (env-entrypoint.sh) over this image's
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# entrypoint, so bash must exist inside the container; curl serves the
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# HEALTHCHECK, same line as ever.
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FROM golang:1.26 AS builder
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WORKDIR /src
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# Module graph first so the download layer caches across source-only changes.
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COPY server/go.mod server/go.sum ./
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RUN go mod download
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COPY server/ ./
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# internal/content's tests read two directories the same three-levels-up
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# relative path away from the test file's own package dir (go test always
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# runs with cwd set there): the committed golden fixtures (frontend/tests/
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# fixtures/*.json — the same set the Python golden-diff comparison used) and
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# the SSR copy (frontend/content/*.yaml, content_loader.go's LoadGlossary
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# etc.). This stage only copies server/ into /src (so /src has no "frontend/"
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# parent to climb to), which is why both land at container-root paths here
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# instead — same three-levels-up relationship the tests' relative paths
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# expect, just anchored differently.
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COPY tests/fixtures /tests/fixtures
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COPY content /content
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RUN test -z "$(gofmt -l .)" && go vet ./... && go test ./...
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# Static binary: CGO off (no libc dependency on Alpine), -trimpath for
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# reproducible paths, -s -w to strip debug info the container never uses.
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RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" \
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-o /out/thermograph-frontend .
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FROM alpine:3.22
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# bash: required by the Swarm stack's env-entrypoint.sh shim (see above).
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# curl: the HEALTHCHECK below (pulls in ca-certificates as a dependency).
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RUN apk add --no-cache bash curl
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# Same uid as the Python image: 10001 is the uid infra provisions readable
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# secrets for (deploy-stack.sh installs /etc/thermograph/stack.env
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# uid-10001-readable) -- do not change it. Explicit group (Alpine's `adduser
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# -S` with no -G falls back to an existing system group, not a same-named
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# one -- a bare `--chown=thermograph` below then has no "thermograph" group
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# to resolve, which the classic (non-BuildKit) builder rejects outright).
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RUN addgroup -S -g 10001 thermograph \
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&& adduser -S -u 10001 -G thermograph -h /home/thermograph thermograph
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COPY --from=builder /out/thermograph-frontend /usr/local/bin/thermograph-frontend
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# The binary embeds its HTML templates (server/internal/render); static/ and
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# content/ stay on disk, resolved relative to the working directory (see
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# server/internal/config: StaticDir="static", ContentDir="content"), so /app
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# mirrors the repo layout the config expects. Read-only at runtime -- the
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# service is stateless and holds no data of its own.
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#
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# Numeric --chown, not the name: needs no /etc/passwd|group lookup at COPY
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# time, so it works identically under BuildKit and the classic builder (the
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# CI runner installs plain `docker.io`, no buildx plugin, so a build there
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# silently uses the classic builder unless BuildKit is forced).
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COPY --chown=10001:10001 static/ /app/static/
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COPY --chown=10001:10001 content/ /app/content/
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USER thermograph
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WORKDIR /app
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# No WORKERS knob anymore: uvicorn needed a process count, the Go server
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# handles concurrency in one process. (The stack/compose files never set it
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# for frontend, so nothing references it.)
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ENV PORT=8080 \
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THERMOGRAPH_BASE=/
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EXPOSE 8080
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HEALTHCHECK --interval=30s --timeout=5s --start-period=40s --retries=3 \
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CMD curl -fsS http://127.0.0.1:${PORT}/healthz || exit 1
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# Exec form, no shell wrapper: the Swarm shim receives this CMD as $@ and
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# execs the binary directly; PID 1 gets SIGTERM and shuts down gracefully.
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CMD ["/usr/local/bin/thermograph-frontend"]
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