einherjar/spa-server
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spa-server/Dockerfile

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feat(spa-server): initial implementation — SPA/PWA container server (v1.0.0) Introduces code.nochebuena.dev/einherjar/spa-server — a container-first HTTP server for single-page applications and progressive web apps. Produces a Docker base image; downstream SPA Dockerfiles require only a single COPY instruction. Interfaces and types (CT-6: one TypeSpec per file): - Config — Port (EINHERJAR_SPA_PORT, default 8080) and StaticDir (EINHERJAR_SPA_STATIC_DIR, default /srv/www); parsed via os.Getenv - Server — implements lifecycle.Component; registered with launcher.New Implementation: - NewServer(logger, cfg) *Server — returns a lifecycle-managed HTTP server - OnInit: builds http.NewServeMux with GET /health and /* routes - OnStart: binds TCP listener synchronously via net.Listen (port conflicts surface immediately), then serves in a background goroutine - OnStop: graceful shutdown via http.Server.Shutdown with 10s timeout spa.NewHandler(logger, staticDir) http.Handler: - Uses http.Dir.Open for path sanitisation (prevents directory traversal) - File exists and is not a directory → served by http.FileServer - File missing or is a directory → serves index.html (SPA router owns all routes) - Directory listing is disabled health.NewHandler(logger) http.Handler: - Always responds 200 {"status":"UP","components":{}} - Wire format matches web/health.Response without importing the web module - No external checks — process reachability is the only meaningful health signal Config (EINHERJAR_SPA_* env vars): Port(8080), StaticDir(/srv/www) Docker: - Multi-stage: golang:1.26-alpine builder → alpine:3.21 runtime - Image published as: code.nochebuena.dev/einherjar/spa-server:v1.0.0 code.nochebuena.dev/einherjar/spa-server:latest - VOLUME ["/srv/www"] declared; consumer overrides via COPY or volume mount No external dependencies beyond contracts, core, and the Go standard library.
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FROM golang:1.26-alpine AS builder
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
ARG VERSION=dev
RUN CGO_ENABLED=0 GOOS=linux go build \
-ldflags="-s -w" \
-o spa-server \
./cmd/spa-server
FROM alpine:3.21
RUN apk add --no-cache ca-certificates tzdata
WORKDIR /app
COPY --from=builder /app/spa-server .
chore(spa-server): add Makefile and OCI image labels to Dockerfile Makefile: - dry-run target (default) shows registry, branch, SHA, version, all computed image tags, and build args — no side effects - build/push/release targets wire docker build and docker push - Branch-aware tag strategy: main → <version> + latest develop → <version>-dev-<short-sha> release/* → <version>-qa-<short-sha> - Version resolved from the highest semver tag at HEAD; falls back to the most recent reachable tag via git describe - BASE_DIGEST resolved at build time from the local Docker daemon; dry-run prints a hint when the base image is not yet pulled - Note: case/esac cannot be used inside $(shell) — Make's parser matches the pattern ")" as the function's closing paren before the shell sees it; if/elif/else/fi used instead Dockerfile: - OCI standard labels added to the final stage via build args (VERSION, GIT_SHA, BASE_DIGEST): org.opencontainers.image.source — repo URL org.opencontainers.image.version — semver tag org.opencontainers.image.revision — git commit SHA org.opencontainers.image.base.name — alpine:3.21 org.opencontainers.image.base.digest — digest of base image at build time - Custom label: dev.nochebuena.healthz — /health
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ARG VERSION=dev
ARG GIT_SHA=unknown
ARG BASE_DIGEST=
LABEL org.opencontainers.image.source="https://code.nochebuena.dev/einherjar/spa-server"
LABEL org.opencontainers.image.version="$VERSION"
LABEL org.opencontainers.image.revision="$GIT_SHA"
LABEL org.opencontainers.image.base.name="alpine:3.21"
LABEL org.opencontainers.image.base.digest="$BASE_DIGEST"
LABEL dev.nochebuena.healthz="/health"
feat(spa-server): initial implementation — SPA/PWA container server (v1.0.0) Introduces code.nochebuena.dev/einherjar/spa-server — a container-first HTTP server for single-page applications and progressive web apps. Produces a Docker base image; downstream SPA Dockerfiles require only a single COPY instruction. Interfaces and types (CT-6: one TypeSpec per file): - Config — Port (EINHERJAR_SPA_PORT, default 8080) and StaticDir (EINHERJAR_SPA_STATIC_DIR, default /srv/www); parsed via os.Getenv - Server — implements lifecycle.Component; registered with launcher.New Implementation: - NewServer(logger, cfg) *Server — returns a lifecycle-managed HTTP server - OnInit: builds http.NewServeMux with GET /health and /* routes - OnStart: binds TCP listener synchronously via net.Listen (port conflicts surface immediately), then serves in a background goroutine - OnStop: graceful shutdown via http.Server.Shutdown with 10s timeout spa.NewHandler(logger, staticDir) http.Handler: - Uses http.Dir.Open for path sanitisation (prevents directory traversal) - File exists and is not a directory → served by http.FileServer - File missing or is a directory → serves index.html (SPA router owns all routes) - Directory listing is disabled health.NewHandler(logger) http.Handler: - Always responds 200 {"status":"UP","components":{}} - Wire format matches web/health.Response without importing the web module - No external checks — process reachability is the only meaningful health signal Config (EINHERJAR_SPA_* env vars): Port(8080), StaticDir(/srv/www) Docker: - Multi-stage: golang:1.26-alpine builder → alpine:3.21 runtime - Image published as: code.nochebuena.dev/einherjar/spa-server:v1.0.0 code.nochebuena.dev/einherjar/spa-server:latest - VOLUME ["/srv/www"] declared; consumer overrides via COPY or volume mount No external dependencies beyond contracts, core, and the Go standard library.
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# Mount your SPA dist/ here, or COPY it in a downstream Dockerfile.
VOLUME ["/srv/www"]
EXPOSE 8080
ENTRYPOINT ["/app/spa-server"]
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