Energy

commit 9fa7d36610a0651fb6c521ef1373dd3050e26496 Author: Thomas Klaehn Date: Sat Apr 18 11:14:12 2026 +0200 Initial commit — energy dashboard frontend (TimescaleDB + Vue/Chart.js) diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..245e748 --- /dev/null +++ b/.env.example @@ -0,0 +1,5 @@ +# Copy to /srv/energy/frontend/.env +ENERGY_AUTH_USER=admin +ENERGY_AUTH_PASSWORD=changeme +ENERGY_AUTH_SECRET=changeme-random-secret +ENERGY_INFLUX_TOKEN=your_influxdb_token_here diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..e4c8736 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +dist/ +frontend/node_modules/ +*.env +!.env.example diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..e57a098 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,25 @@ +# Stage 1: Build frontend +FROM node:22-alpine AS frontend +WORKDIR /app/frontend +COPY frontend/package.json frontend/package-lock.json* ./ +RUN npm install +COPY frontend/ ./ +RUN npm run build + +# Stage 2: Build Go binary +FROM golang:1.24-alpine AS backend +WORKDIR /app +COPY go.mod go.sum ./ +RUN go mod download +COPY . . +COPY --from=frontend /app/dist ./dist +RUN CGO_ENABLED=0 go build -o energy-frontend . + +# Stage 3: Minimal runtime +FROM alpine:3.21 +RUN apk add --no-cache ca-certificates tzdata +WORKDIR /app +COPY --from=backend /app/energy-frontend . +EXPOSE 8080 +USER nobody:nobody +ENTRYPOINT ["./energy-frontend"] diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..77e0e4e --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,15 @@ +services: + energy-frontend: + build: . + container_name: energy-frontend + restart: unless-stopped + ports: + - "8383:8080" + env_file: /srv/energy/frontend/.env + environment: + ENERGY_PORT: 8080 + ENERGY_DB_DSN: postgres://energy:changeme@timescaledb:5432/energy + networks: + - proxy + - fitmonitor-network + diff --git a/frontend.go b/frontend.go new file mode 100644 index 0000000..71dccda --- /dev/null +++ b/frontend.go @@ -0,0 +1,6 @@ +package main + +import "embed" + +//go:embed all:dist +var frontendDist embed.FS diff --git a/frontend/index.html b/frontend/index.html new file mode 100644 index 0000000..2e295b6 --- /dev/null +++ b/frontend/index.html @@ -0,0 +1,12 @@ + + + + + + Energy + + +

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"devDependencies": { + "@vitejs/plugin-vue": "^5.2.0", + "typescript": "~5.7.0", + "vite": "^6.0.0", + "vue-tsc": "^2.2.0" + } +} diff --git a/frontend/src/App.vue b/frontend/src/App.vue new file mode 100644 index 0000000..b123510 --- /dev/null +++ b/frontend/src/App.vue @@ -0,0 +1,14 @@ + + + diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts new file mode 100644 index 0000000..f796895 --- /dev/null +++ b/frontend/src/api/client.ts @@ -0,0 +1,72 @@ +const BASE = '/energy/api' + +async function request(path: string, options?: RequestInit): Promise { + const res = await fetch(`${BASE}${path}`, { + credentials: 'include', + headers: { 'Content-Type': 'application/json' }, + ...options, + }) + + if (res.status === 401) { + if (window.location.pathname !== '/energy/login') { + window.location.href = '/energy/login' + } + throw new Error('Unauthorized') + } + + if (!res.ok) { + const body = await res.json().catch(() => ({ error: res.statusText })) + throw new Error(body.error || res.statusText) + } + + return res.json() +} + +export interface EnergyBar { + time: string + buy: number + sell: number + produce: number + consume: number +} + +export interface PowerPoint { + time: string + pv: number + house: number + barn: number +} + +export interface BatteryPoint { + time: string + level: number +} + +export const api = { + login(username: string, password: string) { + return request<{ status: string }>('/login', { + method: 'POST', + body: JSON.stringify({ username, password }), + }) + }, + + logout() { + return request<{ status: string }>('/logout', { method: 'POST' }) + }, + + checkAuth() { + return request<{ status: string }>('/auth/check') + }, + + getBars(period: 'day' | 'week' | 'month', count: number) { + return request<{ bars: EnergyBar[] }>(`/bars?period=${period}&count=${count}`) + }, + + getPower(range: string) { + return request<{ points: PowerPoint[] }>(`/power?range=${range}`) + }, + + getBattery(range: string) { + return request<{ points: BatteryPoint[] }>(`/battery?range=${range}`) + }, +} diff --git a/frontend/src/composables/useAuth.ts b/frontend/src/composables/useAuth.ts new file mode 100644 index 0000000..bb1b92d --- /dev/null +++ b/frontend/src/composables/useAuth.ts @@ -0,0 +1,27 @@ +import { ref } from 'vue' +import { api } from '@/api/client' + +const authenticated = ref(false) + +export function useAuth() { + async function login(username: string, password: string) { + await api.login(username, password) + authenticated.value = true + } + + async function logout() { + await api.logout() + authenticated.value = false + } + + async function checkAuth() { + try { + await api.checkAuth() + authenticated.value = true + } catch { + authenticated.value = false + } + } + + return { authenticated, login, logout, checkAuth } +} diff --git a/frontend/src/main.ts b/frontend/src/main.ts new file mode 100644 index 0000000..54ce204 --- /dev/null +++ b/frontend/src/main.ts @@ -0,0 +1,6 @@ +import { createApp } from 'vue' +import App from './App.vue' +import router from './router' +import './style.css' + +createApp(App).use(router).mount('#app') diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts new file mode 100644 index 0000000..bbd7123 --- /dev/null +++ b/frontend/src/router/index.ts @@ -0,0 +1,46 @@ +import { createRouter, createWebHistory } from 'vue-router' +import { useAuth } from '@/composables/useAuth' + +const router = createRouter({ + history: createWebHistory('/energy'), + routes: [ + { + path: '/login', + name: 'login', + component: () => import('@/views/LoginView.vue'), + }, + { + path: '/', + component: () => import('@/views/EnergyLayout.vue'), + meta: { requiresAuth: true }, + redirect: '/live', + children: [ + { + path: 'live', + name: 'live', + component: () => import('@/views/EnergyView.vue'), + }, + { + path: 'statistics', + name: 'statistics', + component: () => import('@/views/StatisticsView.vue'), + }, + ], + }, + ], +}) + +router.beforeEach(async (to) => { + if (!to.meta.requiresAuth) return true + + const { authenticated, checkAuth } = useAuth() + if (!authenticated.value) { + await checkAuth() + } + if (!authenticated.value) { + return { name: 'login', query: { redirect: to.fullPath } } + } + return true +}) + +export default router diff --git a/frontend/src/style.css b/frontend/src/style.css new file mode 100644 index 0000000..71c4a8f --- /dev/null +++ b/frontend/src/style.css @@ -0,0 +1,116 @@ +:root { + --bg: #0f1117; + --bg-card: #1a1d27; + --bg-input: #252830; + --border: #2e3140; + --text: #e4e6eb; + --text-muted: #8b8fa3; + --accent: #4f8ff7; + --accent-hover: #3a7ae0; + --green: #4caf50; + --orange: #ff9800; + --red: #f44336; + --radius: 8px; +} + +* { + margin: 0; + padding: 0; + box-sizing: border-box; +} + +body { + font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; + background: var(--bg); + color: var(--text); + line-height: 1.5; +} + +a { + color: var(--accent); + text-decoration: none; +} + +.navbar { + display: flex; + align-items: center; + justify-content: space-between; + padding: 0 1.5rem; + height: 56px; + background: var(--bg-card); + border-bottom: 1px solid var(--border); +} + +.nav-brand { + font-size: 1.1rem; + font-weight: 600; + color: var(--text); +} + +.card { + background: var(--bg-card); + border: 1px solid var(--border); + border-radius: var(--radius); + padding: 1.25rem; +} + +.btn { + background: var(--accent); + color: #fff; + border: none; + border-radius: var(--radius); + padding: 0.5rem 1rem; + font-size: 0.9rem; + cursor: pointer; + transition: background 0.15s; +} + +.btn:hover { + background: var(--accent-hover); +} + +.btn:disabled { + opacity: 0.6; + cursor: not-allowed; +} + +.btn-ghost { + background: transparent; + color: var(--text-muted); + border: none; + padding: 0.5rem 1rem; + font-size: 0.9rem; + cursor: pointer; + border-radius: var(--radius); + transition: color 0.15s, background 0.15s; +} + +.btn-ghost:hover { + color: var(--text); + background: var(--bg-input); +} + +input { + background: var(--bg-input); + border: 1px solid var(--border); + border-radius: var(--radius); + color: var(--text); + padding: 0.5rem 0.75rem; + font-size: 0.9rem; + width: 100%; +} + +input:focus { + outline: none; + border-color: var(--accent); +} + +.error { + color: var(--red); + font-size: 0.875rem; +} + +.text-muted { + color: var(--text-muted); + font-size: 0.85rem; +} diff --git a/frontend/src/views/EnergyLayout.vue b/frontend/src/views/EnergyLayout.vue new file mode 100644 index 0000000..f5dd3ac --- /dev/null +++ b/frontend/src/views/EnergyLayout.vue @@ -0,0 +1,132 @@ + + + + + diff --git a/frontend/src/views/EnergyView.vue b/frontend/src/views/EnergyView.vue new file mode 100644 index 0000000..f4395da --- /dev/null +++ b/frontend/src/views/EnergyView.vue @@ -0,0 +1,318 @@ + + + + + diff --git a/frontend/src/views/LoginView.vue b/frontend/src/views/LoginView.vue new file mode 100644 index 0000000..df8b64a --- /dev/null +++ b/frontend/src/views/LoginView.vue @@ -0,0 +1,63 @@ + + + + + diff --git a/frontend/src/views/StatisticsView.vue b/frontend/src/views/StatisticsView.vue new file mode 100644 index 0000000..f908da1 --- /dev/null +++ b/frontend/src/views/StatisticsView.vue @@ -0,0 +1,237 @@ + + + + + diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json new file mode 100644 index 0000000..4bfbaef --- /dev/null +++ b/frontend/tsconfig.json @@ -0,0 +1,20 @@ +{ + "compilerOptions": { + "target": "ES2020", + "module": "ESNext", + "moduleResolution": "bundler", + "strict": true, + "jsx": "preserve", + "resolveJsonModule": true, + "isolatedModules": true, + "esModuleInterop": true, + "lib": ["ES2020", "DOM", "DOM.Iterable"], + "skipLibCheck": true, + "noEmit": true, + "paths": { + "@/*": ["./src/*"] + }, + "baseUrl": "." + }, + "include": ["src/**/*.ts", "src/**/*.vue"] +} diff --git a/frontend/tsconfig.tsbuildinfo b/frontend/tsconfig.tsbuildinfo new file mode 100644 index 0000000..e1375e3 --- /dev/null +++ b/frontend/tsconfig.tsbuildinfo @@ -0,0 +1 @@ +{"root":["./src/main.ts","./src/api/client.ts","./src/composables/useAuth.ts","./src/router/index.ts","./src/App.vue","./src/views/DashboardView.vue","./src/views/LoginView.vue"],"version":"5.7.3"} \ No newline at end of file diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts new file mode 100644 index 0000000..d61ab3d --- /dev/null +++ b/frontend/vite.config.ts @@ -0,0 +1,28 @@ +import { defineConfig } from 'vite' +import vue from '@vitejs/plugin-vue' +import { fileURLToPath, URL } from 'node:url' + +export default defineConfig({ + plugins: [vue()], + resolve: { + alias: { + '@': fileURLToPath(new URL('./src', import.meta.url)) + } + }, + server: { + port: 5174, + host: '0.0.0.0', + allowedHosts: true, + proxy: { + '/api': { + target: 'http://localhost:8080', + changeOrigin: true + } + } + }, + base: '/energy/', + build: { + outDir: '../dist', + emptyOutDir: true + } +}) diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..6767504 --- /dev/null +++ b/go.mod @@ -0,0 +1,15 @@ +module energy-frontend + +go 1.24.0 + +toolchain go1.24.5 + +require github.com/jackc/pgx/v5 v5.8.0 + +require ( + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect + github.com/jackc/puddle/v2 v2.2.2 // indirect + golang.org/x/sync v0.17.0 // indirect + golang.org/x/text v0.29.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..87a6c8a --- /dev/null +++ b/go.sum @@ -0,0 +1,26 @@ +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM= +github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg= +github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo= +github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM= +github.com/jackc/pgx/v5 v5.8.0 h1:TYPDoleBBme0xGSAX3/+NujXXtpZn9HBONkQC7IEZSo= +github.com/jackc/pgx/v5 v5.8.0/go.mod h1:QVeDInX2m9VyzvNeiCJVjCkNFqzsNb43204HshNSZKw= +github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo= +github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= +github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= +github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= +github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U= +github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U= +golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug= +golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI= +golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk= +golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/internal/api/auth.go b/internal/api/auth.go new file mode 100644 index 0000000..14e7f16 --- /dev/null +++ b/internal/api/auth.go @@ -0,0 +1,113 @@ +package api + +import ( + "crypto/hmac" + "crypto/sha256" + "crypto/subtle" + "encoding/hex" + "encoding/json" + "fmt" + "net/http" + "strconv" + "strings" + "time" + + "energy-frontend/internal/config" +) + +const ( + cookieName = "energy_session" + cookieMaxAge = 7 * 24 * 3600 // 7 days + cookiePath = "/energy" +) + +type authHandler struct { + cfg config.AuthConfig +} + +func newAuthHandler(cfg config.AuthConfig) *authHandler { + return &authHandler{cfg: cfg} +} + +func (h *authHandler) loginHandler(w http.ResponseWriter, r *http.Request) { + var req struct { + Username string `json:"username"` + Password string `json:"password"` + } + if err := json.NewDecoder(r.Body).Decode(&req); err != nil { + writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid request"}) + return + } + + if subtle.ConstantTimeCompare([]byte(req.Username), []byte(h.cfg.Username)) != 1 || + subtle.ConstantTimeCompare([]byte(req.Password), []byte(h.cfg.Password)) != 1 { + writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "invalid credentials"}) + return + } + + http.SetCookie(w, h.createSessionCookie(req.Username)) + writeJSON(w, http.StatusOK, map[string]string{"status": "ok"}) +} + +func (h *authHandler) logoutHandler(w http.ResponseWriter, r *http.Request) { + http.SetCookie(w, &http.Cookie{ + Name: cookieName, + Value: "", + Path: cookiePath, + MaxAge: -1, + HttpOnly: true, + SameSite: http.SameSiteLaxMode, + }) + writeJSON(w, http.StatusOK, map[string]string{"status": "ok"}) +} + +func (h *authHandler) checkHandler(w http.ResponseWriter, r *http.Request) { + writeJSON(w, http.StatusOK, map[string]string{"status": "ok"}) +} + +func (h *authHandler) middleware(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + cookie, err := r.Cookie(cookieName) + if err != nil || !h.validateSession(cookie.Value) { + writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "unauthorized"}) + return + } + next.ServeHTTP(w, r) + }) +} + +func (h *authHandler) createSessionCookie(username string) *http.Cookie { + expires := time.Now().Add(time.Duration(cookieMaxAge) * time.Second) + payload := fmt.Sprintf("%s|%d", username, expires.Unix()) + sig := h.sign(payload) + return &http.Cookie{ + Name: cookieName, + Value: fmt.Sprintf("%s|%s", payload, sig), + Path: cookiePath, + MaxAge: cookieMaxAge, + HttpOnly: true, + SameSite: http.SameSiteLaxMode, + } +} + +func (h *authHandler) validateSession(value string) bool { + parts := strings.SplitN(value, "|", 3) + if len(parts) != 3 { + return false + } + payload := parts[0] + "|" + parts[1] + if !hmac.Equal([]byte(h.sign(payload)), []byte(parts[2])) { + return false + } + exp, err := strconv.ParseInt(parts[1], 10, 64) + if err != nil { + return false + } + return time.Now().Unix() < exp +} + +func (h *authHandler) sign(payload string) string { + mac := hmac.New(sha256.New, []byte(h.cfg.Secret)) + mac.Write([]byte(payload)) + return hex.EncodeToString(mac.Sum(nil)) +} diff --git a/internal/api/energy.go b/internal/api/energy.go new file mode 100644 index 0000000..99c754a --- /dev/null +++ b/internal/api/energy.go @@ -0,0 +1,260 @@ +package api + +import ( + "context" + "fmt" + "sort" + "time" + + "github.com/jackc/pgx/v5/pgxpool" +) + +type EnergyBar struct { + Time time.Time `json:"time"` + Buy float64 `json:"buy"` + Sell float64 `json:"sell"` + Produce float64 `json:"produce"` + Consume float64 `json:"consume"` +} + +type PowerPoint struct { + Time time.Time `json:"time"` + PV float64 `json:"pv"` + Barn float64 `json:"barn"` + House float64 `json:"house"` +} + +type BatteryPoint struct { + Time time.Time `json:"time"` + Level float64 `json:"level"` +} + +var periodDefaults = map[string]int{ + "day": 30, + "week": 12, + "month": 12, +} + +// viewForRange picks the right continuous aggregate views for the given time range. +func viewForRange(timeRange string) (invView, meterView, interval string) { + switch timeRange { + case "1h": + return "inverter_10m", "power_meter_10m", "1 hour" + case "6h": + return "inverter_10m", "power_meter_10m", "6 hours" + case "7d": + return "inverter_1h", "power_meter_1h", "7 days" + default: // "24h" and anything else + return "inverter_10m", "power_meter_10m", "24 hours" + } +} + +func sortedUnion(maps ...map[time.Time]float64) []time.Time { + seen := make(map[time.Time]bool) + for _, m := range maps { + for t := range m { + seen[t] = true + } + } + times := make([]time.Time, 0, len(seen)) + for t := range seen { + times = append(times, t) + } + sort.Slice(times, func(i, j int) bool { return times[i].Before(times[j]) }) + return times +} + +func getPower(ctx context.Context, pool *pgxpool.Pool, timeRange string) ([]PowerPoint, error) { + invView, meterView, interval := viewForRange(timeRange) + + type colRow struct { + bucket time.Time + value float64 + } + queryCol := func(sql string) (map[time.Time]float64, error) { + rows, err := pool.Query(ctx, sql) + if err != nil { + return nil, err + } + defer rows.Close() + m := make(map[time.Time]float64) + for rows.Next() { + var r colRow + if err := rows.Scan(&r.bucket, &r.value); err != nil { + return nil, err + } + m[r.bucket] = r.value + } + return m, rows.Err() + } + + pvSQL := fmt.Sprintf( + `SELECT bucket, COALESCE(pv_power, 0) FROM %s WHERE bucket >= NOW() - '%s'::interval ORDER BY bucket`, + invView, interval) + houseSQL := fmt.Sprintf( + `SELECT bucket, COALESCE(total_power, 0) FROM %s WHERE device = 'house' AND bucket >= NOW() - '%s'::interval ORDER BY bucket`, + meterView, interval) + barnSQL := fmt.Sprintf( + `SELECT bucket, COALESCE(total_power, 0) FROM %s WHERE device = 'barn' AND bucket >= NOW() - '%s'::interval ORDER BY bucket`, + meterView, interval) + + type result struct { + m map[time.Time]float64 + err error + } + pvCh := make(chan result, 1) + houseCh := make(chan result, 1) + barnCh := make(chan result, 1) + + go func() { m, e := queryCol(pvSQL); pvCh <- result{m, e} }() + go func() { m, e := queryCol(houseSQL); houseCh <- result{m, e} }() + go func() { m, e := queryCol(barnSQL); barnCh <- result{m, e} }() + + pvRes := <-pvCh + houseRes := <-houseCh + barnRes := <-barnCh + + if pvRes.err != nil { + return nil, pvRes.err + } + if houseRes.err != nil { + return nil, houseRes.err + } + if barnRes.err != nil { + return nil, barnRes.err + } + + times := sortedUnion(pvRes.m, houseRes.m, barnRes.m) + pts := make([]PowerPoint, 0, len(times)) + for _, t := range times { + pts = append(pts, PowerPoint{ + Time: t, + PV: pvRes.m[t], + House: houseRes.m[t], + Barn: barnRes.m[t], + }) + } + return pts, nil +} + +func getBattery(ctx context.Context, pool *pgxpool.Pool, timeRange string) ([]BatteryPoint, error) { + invView, _, interval := viewForRange(timeRange) + + sql := fmt.Sprintf( + `SELECT bucket, COALESCE(battery_soc, 0) FROM %s WHERE bucket >= NOW() - '%s'::interval ORDER BY bucket`, + invView, interval) + + rows, err := pool.Query(ctx, sql) + if err != nil { + return nil, err + } + defer rows.Close() + + var pts []BatteryPoint + for rows.Next() { + var p BatteryPoint + if err := rows.Scan(&p.Time, &p.Level); err != nil { + return nil, err + } + pts = append(pts, p) + } + return pts, rows.Err() +} + +func getBars(ctx context.Context, pool *pgxpool.Pool, period string, count int) ([]EnergyBar, error) { + var periodTrunc, rangeInterval string + switch period { + case "day": + periodTrunc = "day" + rangeInterval = fmt.Sprintf("%d days", count+1) + case "week": + periodTrunc = "week" + rangeInterval = fmt.Sprintf("%d weeks", count+1) + case "month": + periodTrunc = "month" + rangeInterval = fmt.Sprintf("%d months", count+1) + default: + return nil, fmt.Errorf("unknown period %q", period) + } + + // DISTINCT ON picks the last-written daily row for each period bucket, + // then LAG() computes the delta (energy consumed/produced/traded) over + // that period. Fetching count+1 rows ensures LAG has a previous value + // for the first bar; we trim to count at the end. + sql := fmt.Sprintf(` +WITH inv_last AS ( + SELECT DISTINCT ON (date_trunc('%[1]s', bucket)) + date_trunc('%[1]s', bucket) AS period, + grid_import_kwh, grid_export_kwh, pv_energy_kwh + FROM inverter_daily + WHERE bucket >= NOW() - '%[2]s'::interval + ORDER BY date_trunc('%[1]s', bucket), bucket DESC +), +house_last AS ( + SELECT DISTINCT ON (date_trunc('%[1]s', bucket)) + date_trunc('%[1]s', bucket) AS period, + import_kwh + FROM power_meter_daily + WHERE device = 'house' AND bucket >= NOW() - '%[2]s'::interval + ORDER BY date_trunc('%[1]s', bucket), bucket DESC +), +barn_last AS ( + SELECT DISTINCT ON (date_trunc('%[1]s', bucket)) + date_trunc('%[1]s', bucket) AS period, + import_kwh + FROM power_meter_daily + WHERE device = 'barn' AND bucket >= NOW() - '%[2]s'::interval + ORDER BY date_trunc('%[1]s', bucket), bucket DESC +), +joined AS ( + SELECT + i.period, + i.grid_import_kwh, + LAG(i.grid_import_kwh) OVER (ORDER BY i.period) AS prev_import, + i.grid_export_kwh, + LAG(i.grid_export_kwh) OVER (ORDER BY i.period) AS prev_export, + i.pv_energy_kwh, + LAG(i.pv_energy_kwh) OVER (ORDER BY i.period) AS prev_pv, + h.import_kwh AS house_kwh, + LAG(h.import_kwh) OVER (ORDER BY i.period) AS prev_house, + b.import_kwh AS barn_kwh, + LAG(b.import_kwh) OVER (ORDER BY i.period) AS prev_barn + FROM inv_last i + LEFT JOIN house_last h ON h.period = i.period + LEFT JOIN barn_last b ON b.period = i.period +) +SELECT + period, + GREATEST(0, grid_import_kwh - prev_import) AS buy, + GREATEST(0, grid_export_kwh - prev_export) AS sell, + GREATEST(0, pv_energy_kwh - prev_pv) AS produce, + GREATEST(0, COALESCE(house_kwh - prev_house, 0) + COALESCE(barn_kwh - prev_barn, 0)) AS consume +FROM joined +WHERE prev_import IS NOT NULL +ORDER BY period +`, periodTrunc, rangeInterval) + + rows, err := pool.Query(ctx, sql) + if err != nil { + return nil, err + } + defer rows.Close() + + var bars []EnergyBar + for rows.Next() { + var b EnergyBar + if err := rows.Scan(&b.Time, &b.Buy, &b.Sell, &b.Produce, &b.Consume); err != nil { + return nil, err + } + bars = append(bars, b) + } + if err := rows.Err(); err != nil { + return nil, err + } + + // Trim to the requested count (the LAG window requires one extra row) + if len(bars) > count { + bars = bars[len(bars)-count:] + } + return bars, nil +} diff --git a/internal/api/router.go b/internal/api/router.go new file mode 100644 index 0000000..7a316d8 --- /dev/null +++ b/internal/api/router.go @@ -0,0 +1,115 @@ +package api + +import ( + "context" + "encoding/json" + "io/fs" + "log" + "net/http" + "strconv" + "strings" + + "github.com/jackc/pgx/v5/pgxpool" + + "energy-frontend/internal/config" +) + +func NewRouter(cfg config.Config, frontendFS fs.FS) http.Handler { + pool, err := pgxpool.New(context.Background(), cfg.DB.DSN) + if err != nil { + log.Fatalf("db pool: %v", err) + } + + mux := http.NewServeMux() + auth := newAuthHandler(cfg.Auth) + + mux.HandleFunc("POST /api/login", auth.loginHandler) + mux.HandleFunc("POST /api/logout", auth.logoutHandler) + + protected := http.NewServeMux() + protected.HandleFunc("GET /api/auth/check", auth.checkHandler) + protected.HandleFunc("GET /api/bars", func(w http.ResponseWriter, r *http.Request) { + period := r.URL.Query().Get("period") + if period == "" { + period = "day" + } + count, err := strconv.Atoi(r.URL.Query().Get("count")) + if err != nil || count <= 0 { + count = periodDefaults[period] + } + bars, err := getBars(r.Context(), pool, period, count) + if err != nil { + writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()}) + return + } + writeJSON(w, http.StatusOK, map[string]interface{}{"bars": bars}) + }) + protected.HandleFunc("GET /api/power", func(w http.ResponseWriter, r *http.Request) { + tr := r.URL.Query().Get("range") + if tr == "" { + tr = "24h" + } + pts, err := getPower(r.Context(), pool, tr) + if err != nil { + writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()}) + return + } + writeJSON(w, http.StatusOK, map[string]interface{}{"points": pts}) + }) + protected.HandleFunc("GET /api/battery", func(w http.ResponseWriter, r *http.Request) { + tr := r.URL.Query().Get("range") + if tr == "" { + tr = "24h" + } + pts, err := getBattery(r.Context(), pool, tr) + if err != nil { + writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()}) + return + } + writeJSON(w, http.StatusOK, map[string]interface{}{"points": pts}) + }) + + mux.Handle("/api/", auth.middleware(protected)) + + if frontendFS != nil { + mux.Handle("/", spaHandler(frontendFS)) + } + + return corsMiddleware(mux) +} + +func spaHandler(frontendFS fs.FS) http.Handler { + fileServer := http.FileServer(http.FS(frontendFS)) + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + path := strings.TrimPrefix(r.URL.Path, "/") + if path == "" { + path = "index.html" + } + if _, err := fs.Stat(frontendFS, path); err == nil { + fileServer.ServeHTTP(w, r) + return + } + r.URL.Path = "/" + fileServer.ServeHTTP(w, r) + }) +} + +func corsMiddleware(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin")) + w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS") + w.Header().Set("Access-Control-Allow-Headers", "Content-Type") + w.Header().Set("Access-Control-Allow-Credentials", "true") + if r.Method == "OPTIONS" { + w.WriteHeader(http.StatusOK) + return + } + next.ServeHTTP(w, r) + }) +} + +func writeJSON(w http.ResponseWriter, status int, v interface{}) { + w.Header().Set("Content-Type", "application/json") + w.WriteHeader(status) + json.NewEncoder(w).Encode(v) +} diff --git a/internal/config/config.go b/internal/config/config.go new file mode 100644 index 0000000..19e3f01 --- /dev/null +++ b/internal/config/config.go @@ -0,0 +1,58 @@ +package config + +import ( + "os" + "strconv" +) + +type Config struct { + Server ServerConfig + Auth AuthConfig + DB DBConfig +} + +type ServerConfig struct { + Port int +} + +type AuthConfig struct { + Username string + Password string + Secret string +} + +type DBConfig struct { + DSN string +} + +func Load() *Config { + return &Config{ + Server: ServerConfig{ + Port: getEnvInt("ENERGY_PORT", 8080), + }, + Auth: AuthConfig{ + Username: getEnv("ENERGY_AUTH_USER", "admin"), + Password: getEnv("ENERGY_AUTH_PASSWORD", ""), + Secret: getEnv("ENERGY_AUTH_SECRET", "change-me-in-production"), + }, + DB: DBConfig{ + DSN: getEnv("ENERGY_DB_DSN", "postgres://energy:changeme@localhost:5433/energy"), + }, + } +} + +func getEnv(key, fallback string) string { + if v := os.Getenv(key); v != "" { + return v + } + return fallback +} + +func getEnvInt(key string, fallback int) int { + if v := os.Getenv(key); v != "" { + if i, err := strconv.Atoi(v); err == nil { + return i + } + } + return fallback +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..d90c66c --- /dev/null +++ b/main.go @@ -0,0 +1,49 @@ +package main + +import ( + "context" + "fmt" + "io/fs" + "log/slog" + "net/http" + "os" + "os/signal" + "syscall" + "time" + + "energy-frontend/internal/api" + "energy-frontend/internal/config" +) + +func main() { + cfg := config.Load() + + frontendFS, _ := fs.Sub(frontendDist, "dist") + router := api.NewRouter(*cfg, frontendFS) + + addr := fmt.Sprintf(":%d", cfg.Server.Port) + srv := &http.Server{ + Addr: addr, + Handler: router, + ReadTimeout: 15 * time.Second, + WriteTimeout: 30 * time.Second, + IdleTimeout: 60 * time.Second, + } + + go func() { + slog.Info("starting server", "addr", addr) + if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed { + slog.Error("server error", "error", err) + os.Exit(1) + } + }() + + sigChan := make(chan os.Signal, 1) + signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM) + <-sigChan + + slog.Info("shutting down") + ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + srv.Shutdown(ctx) +}

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