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+# Go HTTP Server Conventions
+
+This document defines the architectural patterns, design decisions, and conventions for building Go HTTP servers. All new projects must follow these standards.
+
+## Table of Contents
+
+1. [Required Libraries](#1-required-libraries)
+2. [Project Structure](#2-project-structure)
+3. [Dependency Injection (Uber fx)](#3-dependency-injection-uber-fx)
+4. [Server Architecture](#4-server-architecture)
+5. [Routing (go-chi)](#5-routing-go-chi)
+6. [Handler Conventions](#6-handler-conventions)
+7. [Middleware Conventions](#7-middleware-conventions)
+8. [Configuration (Viper)](#8-configuration-viper)
+9. [Logging (slog)](#9-logging-slog)
+10. [Database Wrapper](#10-database-wrapper)
+11. [Globals Package](#11-globals-package)
+12. [Static Assets & Templates](#12-static-assets--templates)
+13. [Health Check](#13-health-check)
+14. [External Integrations](#14-external-integrations)
+
+---
+
+## 1. Required Libraries
+
+These libraries are **mandatory** for all new projects:
+
+| Purpose | Library | Import Path |
+| -------------------- | --------------- | ------------------------------------- |
+| Dependency Injection | Uber fx | `go.uber.org/fx` |
+| HTTP Router | go-chi | `github.com/go-chi/chi` |
+| Logging | slog (stdlib) | `log/slog` |
+| Configuration | Viper | `github.com/spf13/viper` |
+| Environment Loading | godotenv | `github.com/joho/godotenv/autoload` |
+| CORS | go-chi/cors | `github.com/go-chi/cors` |
+| Error Reporting | Sentry | `github.com/getsentry/sentry-go` |
+| Metrics | Prometheus | `github.com/prometheus/client_golang` |
+| Metrics Middleware | go-http-metrics | `github.com/slok/go-http-metrics` |
+| Basic Auth | basicauth-go | `github.com/99designs/basicauth-go` |
+
+---
+
+## 2. Project Structure
+
+```
+project-root/
+├── cmd/
+│ └── {appname}/
+│ └── main.go # Entry point
+├── internal/
+│ ├── config/
+│ │ └── config.go # Configuration loading
+│ ├── database/
+│ │ └── database.go # Database wrapper
+│ ├── globals/
+│ │ └── globals.go # Build-time variables
+│ ├── handlers/
+│ │ ├── handlers.go # Base handler struct and helpers
+│ │ ├── index.go # Individual handlers...
+│ │ ├── healthcheck.go
+│ │ └── {feature}.go
+│ ├── healthcheck/
+│ │ └── healthcheck.go # Health check service
+│ ├── logger/
+│ │ └── logger.go # Logger setup
+│ ├── middleware/
+│ │ └── middleware.go # All middleware definitions
+│ └── server/
+│ ├── server.go # Server struct and lifecycle
+│ ├── http.go # HTTP server setup
+│ └── routes.go # Route definitions
+├── static/
+│ ├── static.go # Embed directive
+│ ├── css/
+│ └── js/
+├── templates/
+│ ├── templates.go # Embed and parse
+│ └── *.html
+├── go.mod
+├── go.sum
+├── Makefile
+└── Dockerfile
+```
+
+### Key Principles
+
+- **`cmd/{appname}/`**: Only the entry point. Minimal logic, just bootstrapping.
+- **`internal/`**: All application packages. Not importable by external projects.
+- **One package per concern**: config, database, handlers, middleware, etc.
+- **Flat handler files**: One file per handler or logical group of handlers.
+
+---
+
+## 3. Dependency Injection (Uber fx)
+
+### Entry Point Pattern
+
+```go
+// cmd/httpd/main.go
+package main
+
+import (
+ "yourproject/internal/config"
+ "yourproject/internal/database"
+ "yourproject/internal/globals"
+ "yourproject/internal/handlers"
+ "yourproject/internal/healthcheck"
+ "yourproject/internal/logger"
+ "yourproject/internal/middleware"
+ "yourproject/internal/server"
+ "go.uber.org/fx"
+)
+
+var (
+ Appname string = "CHANGEME"
+ Version string
+ Buildarch string
+)
+
+func main() {
+ globals.Appname = Appname
+ globals.Version = Version
+ globals.Buildarch = Buildarch
+
+ fx.New(
+ fx.Provide(
+ config.New,
+ database.New,
+ globals.New,
+ handlers.New,
+ logger.New,
+ server.New,
+ middleware.New,
+ healthcheck.New,
+ ),
+ fx.Invoke(func(*server.Server) {}),
+ ).Run()
+}
+```
+
+### Params Struct Pattern
+
+Every component that receives dependencies uses a params struct with `fx.In`:
+
+```go
+type HandlersParams struct {
+ fx.In
+ Logger *logger.Logger
+ Globals *globals.Globals
+ Database *database.Database
+ Healthcheck *healthcheck.Healthcheck
+}
+
+type Handlers struct {
+ params *HandlersParams
+ log *slog.Logger
+ hc *healthcheck.Healthcheck
+}
+```
+
+### Factory Function Pattern
+
+All components expose a `New` function with this signature:
+
+```go
+func New(lc fx.Lifecycle, params SomeParams) (*Something, error) {
+ s := new(Something)
+ s.params = ¶ms
+ s.log = params.Logger.Get()
+
+ lc.Append(fx.Hook{
+ OnStart: func(ctx context.Context) error {
+ // Initialize resources
+ return nil
+ },
+ OnStop: func(ctx context.Context) error {
+ // Cleanup resources
+ return nil
+ },
+ })
+ return s, nil
+}
+```
+
+### Dependency Order
+
+Providers are resolved automatically by fx, but conceptually follow this order:
+
+1. `globals.New` - Build-time variables (no dependencies)
+2. `logger.New` - Logger (depends on Globals)
+3. `config.New` - Configuration (depends on Globals, Logger)
+4. `database.New` - Database (depends on Logger, Config)
+5. `healthcheck.New` - Health check (depends on Globals, Config, Logger, Database)
+6. `middleware.New` - Middleware (depends on Logger, Globals, Config)
+7. `handlers.New` - Handlers (depends on Logger, Globals, Database, Healthcheck)
+8. `server.New` - Server (depends on all above)
+
+---
+
+## 4. Server Architecture
+
+### Server Struct
+
+The Server struct is the central orchestrator:
+
+```go
+// internal/server/server.go
+type ServerParams struct {
+ fx.In
+ Logger *logger.Logger
+ Globals *globals.Globals
+ Config *config.Config
+ Middleware *middleware.Middleware
+ Handlers *handlers.Handlers
+}
+
+type Server struct {
+ startupTime time.Time
+ port int
+ exitCode int
+ sentryEnabled bool
+ log *slog.Logger
+ ctx context.Context
+ cancelFunc context.CancelFunc
+ httpServer *http.Server
+ router *chi.Mux
+ params ServerParams
+ mw *middleware.Middleware
+ h *handlers.Handlers
+}
+```
+
+### Server Factory
+
+```go
+func New(lc fx.Lifecycle, params ServerParams) (*Server, error) {
+ s := new(Server)
+ s.params = params
+ s.mw = params.Middleware
+ s.h = params.Handlers
+ s.log = params.Logger.Get()
+
+ lc.Append(fx.Hook{
+ OnStart: func(ctx context.Context) error {
+ s.startupTime = time.Now()
+ go s.Run()
+ return nil
+ },
+ OnStop: func(ctx context.Context) error {
+ // Server shutdown logic
+ return nil
+ },
+ })
+ return s, nil
+}
+```
+
+### HTTP Server Setup
+
+```go
+// internal/server/http.go
+func (s *Server) serveUntilShutdown() {
+ listenAddr := fmt.Sprintf(":%d", s.params.Config.Port)
+ s.httpServer = &http.Server{
+ Addr: listenAddr,
+ ReadTimeout: 10 * time.Second,
+ WriteTimeout: 10 * time.Second,
+ MaxHeaderBytes: 1 << 20,
+ Handler: s,
+ }
+
+ s.SetupRoutes()
+
+ s.log.Info("http begin listen", "listenaddr", listenAddr)
+ if err := s.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+ s.log.Error("listen error", "error", err)
+ if s.cancelFunc != nil {
+ s.cancelFunc()
+ }
+ }
+}
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ s.router.ServeHTTP(w, r)
+}
+```
+
+### Signal Handling and Graceful Shutdown
+
+```go
+func (s *Server) serve() int {
+ s.ctx, s.cancelFunc = context.WithCancel(context.Background())
+
+ // Signal watcher
+ go func() {
+ c := make(chan os.Signal, 1)
+ signal.Ignore(syscall.SIGPIPE)
+ signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+ sig := <-c
+ s.log.Info("signal received", "signal", sig)
+ if s.cancelFunc != nil {
+ s.cancelFunc()
+ }
+ }()
+
+ go s.serveUntilShutdown()
+
+ for range s.ctx.Done() {
+ }
+ s.cleanShutdown()
+ return s.exitCode
+}
+
+func (s *Server) cleanShutdown() {
+ s.exitCode = 0
+ ctxShutdown, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
+ if err := s.httpServer.Shutdown(ctxShutdown); err != nil {
+ s.log.Error("server clean shutdown failed", "error", err)
+ }
+ if shutdownCancel != nil {
+ shutdownCancel()
+ }
+ s.cleanupForExit()
+ if s.sentryEnabled {
+ sentry.Flush(2 * time.Second)
+ }
+}
+```
+
+---
+
+## 5. Routing (go-chi)
+
+### Route Setup Pattern
+
+```go
+// internal/server/routes.go
+func (s *Server) SetupRoutes() {
+ s.router = chi.NewRouter()
+
+ // Global middleware (applied to all routes)
+ s.router.Use(middleware.Recoverer)
+ s.router.Use(middleware.RequestID)
+ s.router.Use(s.mw.Logging())
+
+ // Conditional middleware
+ if viper.GetString("METRICS_USERNAME") != "" {
+ s.router.Use(s.mw.Metrics())
+ }
+
+ s.router.Use(s.mw.CORS())
+ s.router.Use(middleware.Timeout(60 * time.Second))
+
+ if s.sentryEnabled {
+ sentryHandler := sentryhttp.New(sentryhttp.Options{
+ Repanic: true,
+ })
+ s.router.Use(sentryHandler.Handle)
+ }
+
+ // Routes
+ s.router.Get("/", s.h.HandleIndex())
+
+ // Static files
+ s.router.Mount("/s", http.StripPrefix("/s", http.FileServer(http.FS(static.Static))))
+
+ // API versioning
+ s.router.Route("/api/v1", func(r chi.Router) {
+ r.Get("/now", s.h.HandleNow())
+ })
+
+ // Routes with specific middleware
+ auth := s.mw.Auth()
+ s.router.Get("/login", auth(s.h.HandleLoginGET()).ServeHTTP)
+
+ // Health check (standard path)
+ s.router.Get("/.well-known/healthcheck.json", s.h.HandleHealthCheck())
+
+ // Protected route groups
+ if viper.GetString("METRICS_USERNAME") != "" {
+ s.router.Group(func(r chi.Router) {
+ r.Use(s.mw.MetricsAuth())
+ r.Get("/metrics", http.HandlerFunc(promhttp.Handler().ServeHTTP))
+ })
+ }
+}
+```
+
+### Middleware Ordering (Critical)
+
+1. `middleware.Recoverer` - Panic recovery (must be first)
+2. `middleware.RequestID` - Generate request IDs
+3. `s.mw.Logging()` - Request logging
+4. `s.mw.Metrics()` - Prometheus metrics (if enabled)
+5. `s.mw.CORS()` - CORS headers
+6. `middleware.Timeout(60s)` - Request timeout
+7. `sentryhttp.Handler` - Sentry error reporting (if enabled)
+
+### API Versioning
+
+Use route groups for API versioning:
+
+```go
+s.router.Route("/api/v1", func(r chi.Router) {
+ r.Get("/resource", s.h.HandleResource())
+})
+```
+
+### Static File Serving
+
+Static files are served at `/s/` prefix:
+
+```go
+s.router.Mount("/s", http.StripPrefix("/s", http.FileServer(http.FS(static.Static))))
+```
+
+---
+
+## 6. Handler Conventions
+
+### Handler Base Struct
+
+```go
+// internal/handlers/handlers.go
+type HandlersParams struct {
+ fx.In
+ Logger *logger.Logger
+ Globals *globals.Globals
+ Database *database.Database
+ Healthcheck *healthcheck.Healthcheck
+}
+
+type Handlers struct {
+ params *HandlersParams
+ log *slog.Logger
+ hc *healthcheck.Healthcheck
+}
+
+func New(lc fx.Lifecycle, params HandlersParams) (*Handlers, error) {
+ s := new(Handlers)
+ s.params = ¶ms
+ s.log = params.Logger.Get()
+ s.hc = params.Healthcheck
+ lc.Append(fx.Hook{
+ OnStart: func(ctx context.Context) error {
+ // Compile templates or other initialization
+ return nil
+ },
+ })
+ return s, nil
+}
+```
+
+### Closure-Based Handler Pattern
+
+All handlers return `http.HandlerFunc` using the closure pattern. This allows initialization logic to run once when the handler is created:
+
+```go
+// internal/handlers/index.go
+func (s *Handlers) HandleIndex() http.HandlerFunc {
+ // Initialization runs once
+ t := templates.GetParsed()
+
+ // Handler runs per-request
+ return func(w http.ResponseWriter, r *http.Request) {
+ err := t.ExecuteTemplate(w, "index.html", nil)
+ if err != nil {
+ s.log.Error("template execution failed", "error", err)
+ http.Error(w, http.StatusText(500), 500)
+ }
+ }
+}
+```
+
+### JSON Handler Pattern
+
+```go
+// internal/handlers/now.go
+func (s *Handlers) HandleNow() http.HandlerFunc {
+ // Response struct defined in closure scope
+ type response struct {
+ Now time.Time `json:"now"`
+ }
+ return func(w http.ResponseWriter, r *http.Request) {
+ s.respondJSON(w, r, &response{Now: time.Now()}, 200)
+ }
+}
+```
+
+### Response Helpers
+
+```go
+// internal/handlers/handlers.go
+func (s *Handlers) respondJSON(w http.ResponseWriter, r *http.Request, data interface{}, status int) {
+ w.WriteHeader(status)
+ w.Header().Set("Content-Type", "application/json")
+ if data != nil {
+ err := json.NewEncoder(w).Encode(data)
+ if err != nil {
+ s.log.Error("json encode error", "error", err)
+ }
+ }
+}
+
+func (s *Handlers) decodeJSON(w http.ResponseWriter, r *http.Request, v interface{}) error {
+ return json.NewDecoder(r.Body).Decode(v)
+}
+```
+
+### Handler Naming Convention
+
+- `HandleIndex()` - Main page
+- `HandleLoginGET()` / `HandleLoginPOST()` - Form handlers with HTTP method suffix
+- `HandleNow()` - API endpoints
+- `HandleHealthCheck()` - System endpoints
+
+---
+
+## 7. Middleware Conventions
+
+### Middleware Struct
+
+```go
+// internal/middleware/middleware.go
+type MiddlewareParams struct {
+ fx.In
+ Logger *logger.Logger
+ Globals *globals.Globals
+ Config *config.Config
+}
+
+type Middleware struct {
+ log *slog.Logger
+ params *MiddlewareParams
+}
+
+func New(lc fx.Lifecycle, params MiddlewareParams) (*Middleware, error) {
+ s := new(Middleware)
+ s.params = ¶ms
+ s.log = params.Logger.Get()
+ return s, nil
+}
+```
+
+### Middleware Signature
+
+All custom middleware methods return `func(http.Handler) http.Handler`:
+
+```go
+func (s *Middleware) Auth() func(http.Handler) http.Handler {
+ return func(next http.Handler) http.Handler {
+ return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+ // Before request
+ s.log.Info("AUTH: before request")
+
+ next.ServeHTTP(w, r)
+
+ // After request (optional)
+ })
+ }
+}
+```
+
+### Logging Middleware with Status Capture
+
+```go
+type loggingResponseWriter struct {
+ http.ResponseWriter
+ statusCode int
+}
+
+func NewLoggingResponseWriter(w http.ResponseWriter) *loggingResponseWriter {
+ return &loggingResponseWriter{w, http.StatusOK}
+}
+
+func (lrw *loggingResponseWriter) WriteHeader(code int) {
+ lrw.statusCode = code
+ lrw.ResponseWriter.WriteHeader(code)
+}
+
+func (s *Middleware) Logging() func(http.Handler) http.Handler {
+ return func(next http.Handler) http.Handler {
+ return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+ start := time.Now()
+ lrw := NewLoggingResponseWriter(w)
+ ctx := r.Context()
+ defer func() {
+ latency := time.Since(start)
+ s.log.InfoContext(ctx, "request",
+ "request_start", start,
+ "method", r.Method,
+ "url", r.URL.String(),
+ "useragent", r.UserAgent(),
+ "request_id", ctx.Value(middleware.RequestIDKey).(string),
+ "referer", r.Referer(),
+ "proto", r.Proto,
+ "remoteIP", ipFromHostPort(r.RemoteAddr),
+ "status", lrw.statusCode,
+ "latency_ms", latency.Milliseconds(),
+ )
+ }()
+ next.ServeHTTP(lrw, r)
+ })
+ }
+}
+```
+
+### CORS Middleware
+
+```go
+func (s *Middleware) CORS() func(http.Handler) http.Handler {
+ return cors.Handler(cors.Options{
+ AllowedOrigins: []string{"*"},
+ AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+ AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+ ExposedHeaders: []string{"Link"},
+ AllowCredentials: false,
+ MaxAge: 300,
+ })
+}
+```
+
+### Metrics Middleware
+
+```go
+func (s *Middleware) Metrics() func(http.Handler) http.Handler {
+ mdlw := ghmm.New(ghmm.Config{
+ Recorder: metrics.NewRecorder(metrics.Config{}),
+ })
+ return func(next http.Handler) http.Handler {
+ return std.Handler("", mdlw, next)
+ }
+}
+
+func (s *Middleware) MetricsAuth() func(http.Handler) http.Handler {
+ return basicauth.New(
+ "metrics",
+ map[string][]string{
+ viper.GetString("METRICS_USERNAME"): {
+ viper.GetString("METRICS_PASSWORD"),
+ },
+ },
+ )
+}
+```
+
+---
+
+## 8. Configuration (Viper)
+
+### Config Struct
+
+```go
+// internal/config/config.go
+type ConfigParams struct {
+ fx.In
+ Globals *globals.Globals
+ Logger *logger.Logger
+}
+
+type Config struct {
+ DBURL string
+ Debug bool
+ MaintenanceMode bool
+ MetricsPassword string
+ MetricsUsername string
+ Port int
+ SentryDSN string
+ params *ConfigParams
+ log *slog.Logger
+}
+```
+
+### Configuration Loading
+
+```go
+func New(lc fx.Lifecycle, params ConfigParams) (*Config, error) {
+ log := params.Logger.Get()
+ name := params.Globals.Appname
+
+ // Config file settings
+ viper.SetConfigName(name)
+ viper.SetConfigType("yaml")
+ viper.AddConfigPath(fmt.Sprintf("/etc/%s", name))
+ viper.AddConfigPath(fmt.Sprintf("$HOME/.config/%s", name))
+
+ // Environment variables override everything
+ viper.AutomaticEnv()
+
+ // Defaults
+ viper.SetDefault("DEBUG", "false")
+ viper.SetDefault("MAINTENANCE_MODE", "false")
+ viper.SetDefault("PORT", "8080")
+ viper.SetDefault("DBURL", "")
+ viper.SetDefault("SENTRY_DSN", "")
+ viper.SetDefault("METRICS_USERNAME", "")
+ viper.SetDefault("METRICS_PASSWORD", "")
+
+ // Read config file (optional)
+ if err := viper.ReadInConfig(); err != nil {
+ if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+ // Config file not found is OK
+ } else {
+ log.Error("config file malformed", "error", err)
+ panic(err)
+ }
+ }
+
+ // Build config struct
+ s := &Config{
+ DBURL: viper.GetString("DBURL"),
+ Debug: viper.GetBool("debug"),
+ Port: viper.GetInt("PORT"),
+ SentryDSN: viper.GetString("SENTRY_DSN"),
+ MaintenanceMode: viper.GetBool("MAINTENANCE_MODE"),
+ MetricsUsername: viper.GetString("METRICS_USERNAME"),
+ MetricsPassword: viper.GetString("METRICS_PASSWORD"),
+ log: log,
+ params: ¶ms,
+ }
+
+ // Enable debug logging if configured
+ if s.Debug {
+ params.Logger.EnableDebugLogging()
+ s.log = params.Logger.Get()
+ }
+
+ return s, nil
+}
+```
+
+### Configuration Precedence
+
+1. **Environment variables** (highest priority via `AutomaticEnv()`)
+2. **`.env` file** (loaded via `godotenv/autoload` import)
+3. **Config files**: `/etc/{appname}/{appname}.yaml`, `~/.config/{appname}/{appname}.yaml`
+4. **Defaults** (lowest priority)
+
+### Environment Loading
+
+Import godotenv with autoload to automatically load `.env` files:
+
+```go
+import (
+ _ "github.com/joho/godotenv/autoload"
+)
+```
+
+---
+
+## 9. Logging (slog)
+
+### Logger Struct
+
+```go
+// internal/logger/logger.go
+type LoggerParams struct {
+ fx.In
+ Globals *globals.Globals
+}
+
+type Logger struct {
+ log *slog.Logger
+ level *slog.LevelVar
+ params LoggerParams
+}
+```
+
+### Logger Setup with TTY Detection
+
+```go
+func New(lc fx.Lifecycle, params LoggerParams) (*Logger, error) {
+ l := new(Logger)
+ l.level = new(slog.LevelVar)
+ l.level.Set(slog.LevelInfo)
+
+ // TTY detection for dev vs prod output
+ tty := false
+ if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
+ tty = true
+ }
+
+ var handler slog.Handler
+ if tty {
+ // Text output for development
+ handler = slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+ Level: l.level,
+ AddSource: true,
+ })
+ } else {
+ // JSON output for production
+ handler = slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+ Level: l.level,
+ AddSource: true,
+ })
+ }
+
+ l.log = slog.New(handler)
+ return l, nil
+}
+```
+
+### Logger Methods
+
+```go
+func (l *Logger) EnableDebugLogging() {
+ l.level.Set(slog.LevelDebug)
+ l.log.Debug("debug logging enabled", "debug", true)
+}
+
+func (l *Logger) Get() *slog.Logger {
+ return l.log
+}
+
+func (l *Logger) Identify() {
+ l.log.Info("starting",
+ "appname", l.params.Globals.Appname,
+ "version", l.params.Globals.Version,
+ "buildarch", l.params.Globals.Buildarch,
+ )
+}
+```
+
+### Logging Patterns
+
+```go
+// Info with fields
+s.log.Info("message", "key", "value")
+
+// Error with error object
+s.log.Error("operation failed", "error", err)
+
+// With context
+s.log.InfoContext(ctx, "processing request", "request_id", reqID)
+
+// Structured request logging
+s.log.Info("request completed",
+ "request_start", start,
+ "method", r.Method,
+ "url", r.URL.String(),
+ "status", statusCode,
+ "latency_ms", latency.Milliseconds(),
+)
+
+// Using slog.Group for nested attributes
+s.log.Info("request",
+ slog.Group("http",
+ "method", r.Method,
+ "url", r.URL.String(),
+ ),
+ slog.Group("timing",
+ "start", start,
+ "latency_ms", latency.Milliseconds(),
+ ),
+)
+```
+
+---
+
+## 10. Database Wrapper
+
+### Database Struct
+
+```go
+// internal/database/database.go
+type DatabaseParams struct {
+ fx.In
+ Logger *logger.Logger
+ Config *config.Config
+}
+
+type Database struct {
+ URL string
+ log *slog.Logger
+ params *DatabaseParams
+}
+```
+
+### Database Factory with Lifecycle
+
+```go
+func New(lc fx.Lifecycle, params DatabaseParams) (*Database, error) {
+ s := new(Database)
+ s.params = ¶ms
+ s.log = params.Logger.Get()
+
+ s.log.Info("Database instantiated")
+
+ lc.Append(fx.Hook{
+ OnStart: func(ctx context.Context) error {
+ s.log.Info("Database OnStart Hook")
+ // Connect to database here
+ // Example: s.db, err = sql.Open("postgres", s.params.Config.DBURL)
+ return nil
+ },
+ OnStop: func(ctx context.Context) error {
+ // Disconnect from database here
+ // Example: s.db.Close()
+ return nil
+ },
+ })
+ return s, nil
+}
+```
+
+### Usage Pattern
+
+The Database struct is injected into handlers and other services:
+
+```go
+type HandlersParams struct {
+ fx.In
+ Database *database.Database
+ // ...
+}
+
+// Access in handler
+func (s *Handlers) HandleSomething() http.HandlerFunc {
+ return func(w http.ResponseWriter, r *http.Request) {
+ // Use s.params.Database
+ }
+}
+```
+
+---
+
+## 11. Globals Package
+
+### Package Variables and Struct
+
+```go
+// internal/globals/globals.go
+package globals
+
+import "go.uber.org/fx"
+
+// Package-level variables (set from main)
+var (
+ Appname string
+ Version string
+ Buildarch string
+)
+
+// Struct for DI
+type Globals struct {
+ Appname string
+ Version string
+ Buildarch string
+}
+
+func New(lc fx.Lifecycle) (*Globals, error) {
+ n := &Globals{
+ Appname: Appname,
+ Buildarch: Buildarch,
+ Version: Version,
+ }
+ return n, nil
+}
+```
+
+### Setting Globals in Main
+
+```go
+// cmd/httpd/main.go
+var (
+ Appname string = "CHANGEME" // Default, overridden by build
+ Version string // Set at build time
+ Buildarch string // Set at build time
+)
+
+func main() {
+ globals.Appname = Appname
+ globals.Version = Version
+ globals.Buildarch = Buildarch
+ // ...
+}
+```
+
+### Build-Time Variable Injection
+
+Use ldflags to inject version information at build time:
+
+```makefile
+VERSION := $(shell git describe --tags --always)
+BUILDARCH := $(shell go env GOARCH)
+
+build:
+ go build -ldflags "-X main.Version=$(VERSION) -X main.Buildarch=$(BUILDARCH)" ./cmd/httpd
+```
+
+---
+
+## 12. Static Assets & Templates
+
+### Static File Embedding
+
+```go
+// static/static.go
+package static
+
+import "embed"
+
+//go:embed css js
+var Static embed.FS
+```
+
+Directory structure:
+
+```
+static/
+├── static.go
+├── css/
+│ ├── bootstrap-4.5.3.min.css
+│ └── style.css
+└── js/
+ ├── bootstrap-4.5.3.bundle.min.js
+ └── jquery-3.5.1.slim.min.js
+```
+
+### Template Embedding and Lazy Parsing
+
+```go
+// templates/templates.go
+package templates
+
+import (
+ "embed"
+ "text/template"
+)
+
+//go:embed *.html
+var TemplatesRaw embed.FS
+var TemplatesParsed *template.Template
+
+func GetParsed() *template.Template {
+ if TemplatesParsed == nil {
+ TemplatesParsed = template.Must(template.ParseFS(TemplatesRaw, "*"))
+ }
+ return TemplatesParsed
+}
+```
+
+### Template Composition
+
+Templates use Go's template composition:
+
+```html
+
+{{ template "htmlheader.html" . }} {{ template "navbar.html" . }}
+
+
+
+
+
+{{ template "pagefooter.html" . }} {{ template "htmlfooter.html" . }}
+```
+
+### Static Asset References
+
+Reference static files with `/s/` prefix:
+
+```html
+
+
+
+```
+
+---
+
+## 13. Health Check
+
+### Health Check Service
+
+```go
+// internal/healthcheck/healthcheck.go
+type HealthcheckParams struct {
+ fx.In
+ Globals *globals.Globals
+ Config *config.Config
+ Logger *logger.Logger
+ Database *database.Database
+}
+
+type Healthcheck struct {
+ StartupTime time.Time
+ log *slog.Logger
+ params *HealthcheckParams
+}
+
+func New(lc fx.Lifecycle, params HealthcheckParams) (*Healthcheck, error) {
+ s := new(Healthcheck)
+ s.params = ¶ms
+ s.log = params.Logger.Get()
+
+ lc.Append(fx.Hook{
+ OnStart: func(ctx context.Context) error {
+ s.StartupTime = time.Now()
+ return nil
+ },
+ OnStop: func(ctx context.Context) error {
+ return nil
+ },
+ })
+ return s, nil
+}
+```
+
+### Health Check Response
+
+```go
+type HealthcheckResponse struct {
+ Status string `json:"status"`
+ Now string `json:"now"`
+ UptimeSeconds int64 `json:"uptime_seconds"`
+ UptimeHuman string `json:"uptime_human"`
+ Version string `json:"version"`
+ Appname string `json:"appname"`
+ Maintenance bool `json:"maintenance_mode"`
+}
+
+func (s *Healthcheck) uptime() time.Duration {
+ return time.Since(s.StartupTime)
+}
+
+func (s *Healthcheck) Healthcheck() *HealthcheckResponse {
+ resp := &HealthcheckResponse{
+ Status: "ok",
+ Now: time.Now().UTC().Format(time.RFC3339Nano),
+ UptimeSeconds: int64(s.uptime().Seconds()),
+ UptimeHuman: s.uptime().String(),
+ Appname: s.params.Globals.Appname,
+ Version: s.params.Globals.Version,
+ }
+ return resp
+}
+```
+
+### Standard Endpoint
+
+Health check is served at the standard `.well-known` path:
+
+```go
+s.router.Get("/.well-known/healthcheck.json", s.h.HandleHealthCheck())
+```
+
+---
+
+## 14. External Integrations
+
+### Sentry Error Reporting
+
+Sentry is conditionally enabled based on `SENTRY_DSN` environment variable:
+
+```go
+func (s *Server) enableSentry() {
+ s.sentryEnabled = false
+
+ if s.params.Config.SentryDSN == "" {
+ return
+ }
+
+ err := sentry.Init(sentry.ClientOptions{
+ Dsn: s.params.Config.SentryDSN,
+ Release: fmt.Sprintf("%s-%s", s.params.Globals.Appname, s.params.Globals.Version),
+ })
+ if err != nil {
+ s.log.Error("sentry init failure", "error", err)
+ os.Exit(1)
+ return
+ }
+ s.log.Info("sentry error reporting activated")
+ s.sentryEnabled = true
+}
+```
+
+Sentry middleware with repanic (bubbles panics to chi's Recoverer):
+
+```go
+if s.sentryEnabled {
+ sentryHandler := sentryhttp.New(sentryhttp.Options{
+ Repanic: true,
+ })
+ s.router.Use(sentryHandler.Handle)
+}
+```
+
+Flush Sentry on shutdown:
+
+```go
+if s.sentryEnabled {
+ sentry.Flush(2 * time.Second)
+}
+```
+
+### Prometheus Metrics
+
+Metrics are conditionally enabled and protected by basic auth:
+
+```go
+// Only enable if credentials are configured
+if viper.GetString("METRICS_USERNAME") != "" {
+ s.router.Use(s.mw.Metrics())
+}
+
+// Protected /metrics endpoint
+if viper.GetString("METRICS_USERNAME") != "" {
+ s.router.Group(func(r chi.Router) {
+ r.Use(s.mw.MetricsAuth())
+ r.Get("/metrics", http.HandlerFunc(promhttp.Handler().ServeHTTP))
+ })
+}
+```
+
+### Environment Variables Summary
+
+| Variable | Description | Default |
+| ------------------ | -------------------------------- | ------- |
+| `PORT` | HTTP listen port | 8080 |
+| `DEBUG` | Enable debug logging | false |
+| `DBURL` | Database connection URL | "" |
+| `SENTRY_DSN` | Sentry DSN for error reporting | "" |
+| `MAINTENANCE_MODE` | Enable maintenance mode | false |
+| `METRICS_USERNAME` | Basic auth username for /metrics | "" |
+| `METRICS_PASSWORD` | Basic auth password for /metrics | "" |