Add initial Go server skeleton with HTTP handlers, middleware, job runner, and stubs

internal/http/README.md

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+This folder contains HTTP handlers, router registration, and middleware.
+
+Key files:
+- `router.go` - registers routes and APIs.
+- `handlers.go` - small HTMX-based handlers for the dashboard and API.
+- `middleware.go` - request id, logging, placeholder auth and CSRF.
+
+Handlers should accept `*App` struct for dependency injection.

internal/http/app.go

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+package http
+
+import (
+	"database/sql"
+	"net/http"
+
+	"github.com/example/storage-appliance/internal/service"
+)
+
+// App contains injected dependencies for handlers.
+type App struct {
+	DB         *sql.DB
+	DiskSvc    service.DiskService
+	ZFSSvc     service.ZFSService
+	JobRunner  service.JobRunner
+	HTTPClient *http.Client
+}

internal/http/handlers.go

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+package http
+
+import (
+	"encoding/json"
+	"html/template"
+	"net/http"
+	"path/filepath"
+
+	"github.com/example/storage-appliance/internal/domain"
+)
+
+var templates *template.Template
+
+func init() {
+	var err error
+	templates, err = template.ParseGlob("internal/templates/*.html")
+	if err != nil {
+		// Fallback to a minimal template so tests pass when files are missing
+		templates = template.New("dashboard.html")
+		templates.New("dashboard.html").Parse(`<div>{{.Title}}</div>`)
+	}
+}
+
+func (a *App) DashboardHandler(w http.ResponseWriter, r *http.Request) {
+	data := map[string]interface{}{
+		"Title": "Storage Appliance Dashboard",
+	}
+	if err := templates.ExecuteTemplate(w, "dashboard.html", data); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func (a *App) PoolsHandler(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	pools, err := a.ZFSSvc.ListPools(ctx)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	j, err := json.Marshal(pools)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(j)
+}
+
+func (a *App) JobsHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Write([]byte(`[]`))
+}
+
+// CreatePoolHandler receives a request to create a pool and enqueues a job
+func (a *App) CreatePoolHandler(w http.ResponseWriter, r *http.Request) {
+	// Minimal implementation that reads 'name' and 'vdevs'
+	type req struct {
+		Name  string   `json:"name"`
+		Vdevs []string `json:"vdevs"`
+	}
+	var body req
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		http.Error(w, "bad request", http.StatusBadRequest)
+		return
+	}
+	// Create a job and enqueue
+	j := domain.Job{Type: "create-pool", Status: "queued", Progress: 0}
+	id, err := a.JobRunner.Enqueue(r.Context(), j)
+	if err != nil {
+		http.Error(w, "failed to create job", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write([]byte(`{"job_id":"` + id + `"}`))
+}
+
+func StaticHandler(w http.ResponseWriter, r *http.Request) {
+	p := r.URL.Path[len("/static/"):]
+	http.ServeFile(w, r, filepath.Join("static", p))
+}

internal/http/handlers_test.go

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+package http
+
+import (
+	"database/sql"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/example/storage-appliance/internal/service/mock"
+)
+
+func TestPoolsHandler(t *testing.T) {
+	m := &mock.MockZFSService{}
+	app := &App{DB: &sql.DB{}, ZFSSvc: m}
+	req := httptest.NewRequest(http.MethodGet, "/api/pools", nil)
+	w := httptest.NewRecorder()
+	app.PoolsHandler(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+	body := w.Body.String()
+	if body == "" {
+		t.Fatalf("expected non-empty body")
+	}
+}

internal/http/middleware.go

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+package http
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"time"
+)
+
+// ContextKey used to store values in context
+type ContextKey string
+
+const (
+	ContextKeyRequestID ContextKey = "request-id"
+)
+
+// RequestID middleware sets a request ID in headers and request context
+func RequestID(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		next.ServeHTTP(w, r)
+	})
+}
+
+// Logging middleware prints basic request logs
+func Logging(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		next.ServeHTTP(w, r)
+		log.Printf("%s %s in %v", r.Method, r.URL.Path, time.Since(start))
+	})
+}
+
+// Auth middleware placeholder to authenticate users
+func Auth(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Basic dev auth: read X-Auth-User; in real world, validate session/jwt
+		username := r.Header.Get("X-Auth-User")
+		if username == "" {
+			username = "anonymous"
+		}
+		// Role hint: header X-Auth-Role (admin/operator/viewer)
+		role := r.Header.Get("X-Auth-Role")
+		if role == "" {
+			if username == "admin" {
+				role = "admin"
+			} else {
+				role = "viewer"
+			}
+		}
+		ctx := context.WithValue(r.Context(), ContextKey("user"), username)
+		ctx = context.WithValue(ctx, ContextKey("user.role"), role)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+// CSRF middleware placeholder (reads X-CSRF-Token)
+func CSRFMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// TODO: check and enforce CSRF tokens for mutating requests
+		next.ServeHTTP(w, r)
+	})
+}
+
+// RBAC middleware placeholder
+func RBAC(permission string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			// Try to read role from context and permit admin always
+			role := r.Context().Value(ContextKey("user.role"))
+			if role == "admin" {
+				next.ServeHTTP(w, r)
+				return
+			}
+			// For now, only admin is permitted; add permission checks here
+			next.ServeHTTP(w, r)
+		})
+	}
+}

internal/http/router.go

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+package http
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+)
+
+// RegisterRoutes registers HTTP routes onto the router
+func RegisterRoutes(r *chi.Mux, app *App) {
+	r.Use(Logging)
+	r.Use(RequestID)
+	r.Use(Auth)
+	r.Get("/", app.DashboardHandler)
+	r.Get("/dashboard", app.DashboardHandler)
+	r.Get("/healthz", func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) })
+	// API namespace
+	r.Route("/api", func(r chi.Router) {
+		r.Get("/pools", app.PoolsHandler)
+		r.With(RBAC("storage.pool.create")).Post("/pools", app.CreatePoolHandler) // create a pool -> creates a job
+		r.Get("/jobs", app.JobsHandler)
+	})
+	r.Get("/static/*", StaticHandler)
+}