Files
spa-server/config.go

37 lines
911 B
Go
Raw Permalink Normal View History

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.
2026-06-02 18:49:05 +00:00
package spaserver
import (
"os"
"strconv"
)
// Config holds the server configuration.
// All fields are populated from environment variables by [DefaultConfig].
type Config struct {
// Port is the TCP port the server listens on.
Port int `env:"EINHERJAR_SPA_PORT" envDefault:"8080"`
// StaticDir is the filesystem path that contains index.html and all assets.
StaticDir string `env:"EINHERJAR_SPA_STATIC_DIR" envDefault:"/srv/www"`
}
// DefaultConfig returns a Config populated from environment variables,
// falling back to safe defaults when variables are unset.
func DefaultConfig() Config {
port := 8080
if v := os.Getenv("EINHERJAR_SPA_PORT"); v != "" {
if p, err := strconv.Atoi(v); err == nil && p > 0 {
port = p
}
}
staticDir := "/srv/www"
if v := os.Getenv("EINHERJAR_SPA_STATIC_DIR"); v != "" {
staticDir = v
}
return Config{
Port: port,
StaticDir: staticDir,
}
}