From 66b66e6118dd43ccbd1e85e33d44a02de7a2b812 Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Tue, 11 Jun 2024 10:07:25 +0200
Subject: server: automatically build, re-build and reload in dev

---
 internal/server/dev.go    | 71 +++++++++++++++++++++++++++++++++++++++++++++++
 internal/server/server.go | 54 +++++++++++++++++++++++++++++------
 2 files changed, 116 insertions(+), 9 deletions(-)
 create mode 100644 internal/server/dev.go

(limited to 'internal')

diff --git a/internal/server/dev.go b/internal/server/dev.go
new file mode 100644
index 0000000..f7ebb82
--- /dev/null
+++ b/internal/server/dev.go
@@ -0,0 +1,71 @@
+package server
+
+import (
+	"fmt"
+	"io/fs"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"time"
+	"website/internal/log"
+
+	"github.com/fsnotify/fsnotify"
+	"github.com/pkg/errors"
+)
+
+type FileWatcher struct {
+	*fsnotify.Watcher
+}
+
+func NewFileWatcher() (*FileWatcher, error) {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, errors.WithMessage(err, "could not create watcher")
+	}
+
+	return &FileWatcher{watcher}, nil
+}
+
+func (watcher FileWatcher) AddRecursive(from string) error {
+	log.Debug("walking directory tree", "root", from)
+	err := filepath.WalkDir(from, func(path string, entry fs.DirEntry, err error) error {
+		if err != nil {
+			return errors.WithMessagef(err, "could not walk directory %s", path)
+		}
+		if entry.IsDir() {
+			log.Debug("adding directory to watcher", "path", path)
+			if err = watcher.Add(path); err != nil {
+				return errors.WithMessagef(err, "could not add directory %s to watcher", path)
+			}
+		}
+
+		return nil
+	})
+
+	return errors.WithMessage(err, "error walking directory tree")
+}
+
+func (watcher FileWatcher) Start(callback func(string)) {
+	for {
+		select {
+		case event := <-watcher.Events:
+			if event.Has(fsnotify.Create) || event.Has(fsnotify.Rename) {
+				f, err := os.Stat(event.Name)
+				if err != nil {
+					slog.Error(fmt.Sprintf("error handling %s event: %v", event.Op.String(), err))
+				} else if f.IsDir() {
+					err = watcher.Add(event.Name)
+					if err != nil {
+						slog.Error(fmt.Sprintf("error adding new folder to watcher: %v", err))
+					}
+				}
+			}
+			if event.Has(fsnotify.Rename) || event.Has(fsnotify.Write) {
+				callback(event.Name)
+				time.Sleep(500 * time.Millisecond)
+			}
+		case err := <-watcher.Errors:
+			slog.Error(fmt.Sprintf("error in watcher: %v", err))
+		}
+	}
+}
diff --git a/internal/server/server.go b/internal/server/server.go
index 31db347..4692965 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -9,10 +9,12 @@ import (
 	"slices"
 	"time"
 
+	"website/internal/builder"
 	cfg "website/internal/config"
 	"website/internal/log"
 	"website/internal/website"
 
+	"github.com/osdevisnot/sorvor/pkg/livereload"
 	"github.com/pkg/errors"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/h2c"
@@ -25,8 +27,7 @@ var (
 )
 
 type Config struct {
-	Production    bool   `conf:"default:false"`
-	InDevServer   bool   `conf:"default:false"`
+	Development   bool   `conf:"default:false,flag:dev"`
 	Root          string `conf:"default:website"`
 	ListenAddress string `conf:"default:localhost"`
 	Port          string `conf:"default:3000,short:p"`
@@ -68,12 +69,43 @@ func New(runtimeConfig *Config) (*Server, error) {
 	}
 
 	listenAddress := net.JoinHostPort(runtimeConfig.ListenAddress, runtimeConfig.Port)
+	top := http.NewServeMux()
 
-	if !runtimeConfig.Production {
+	if runtimeConfig.Development {
 		applyDevModeOverrides(config, listenAddress)
+		builderConfig := builder.IOConfig{
+			Source:      "content",
+			Destination: runtimeConfig.Root,
+			BaseURL:     config.BaseURL,
+			Development: true,
+		}
+		builder.BuildSite(builderConfig)
+
+		liveReload := livereload.New()
+		top.Handle("/_/reload", liveReload)
+		liveReload.Start()
+		fw, err := NewFileWatcher()
+		if err != nil {
+			return nil, errors.WithMessage(err, "could not create file watcher")
+		}
+		for _, dir := range []string{"content", "static", "templates"} {
+			err := fw.AddRecursive(dir)
+			if err != nil {
+				return nil, errors.WithMessagef(
+					err,
+					"could not add directory %s to file watcher",
+					dir,
+				)
+			}
+		}
+		go fw.Start(func(filename string) {
+			log.Debug("file updated", "filename", filename)
+			builder.BuildSite(builderConfig)
+			liveReload.Reload()
+		})
 	}
 
-	top := http.NewServeMux()
+	loggingMux := http.NewServeMux()
 	mux, err := website.NewMux(config, runtimeConfig.Root)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not create website mux")
@@ -81,13 +113,19 @@ func New(runtimeConfig *Config) (*Server, error) {
 	log.Debug("binding main handler to", "host", listenAddress)
 	hostname := config.BaseURL.Hostname()
 
-	top.Handle(hostname+"/", mux)
+	loggingMux.Handle(hostname+"/", mux)
 
-	top.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+	loggingMux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		newURL := config.BaseURL.JoinPath(r.URL.String())
 		http.Redirect(w, r, newURL.String(), 301)
 	})
 
+	top.Handle("/",
+		serverHeaderHandler(
+			wrapHandlerWithLogging(loggingMux),
+		),
+	)
+
 	top.HandleFunc("/health", func(w http.ResponseWriter, _ *http.Request) {
 		w.WriteHeader(http.StatusNoContent)
 	})
@@ -97,9 +135,7 @@ func New(runtimeConfig *Config) (*Server, error) {
 			Addr:              listenAddress,
 			ReadHeaderTimeout: 1 * time.Minute,
 			Handler: http.MaxBytesHandler(h2c.NewHandler(
-				serverHeaderHandler(
-					wrapHandlerWithLogging(top),
-				),
+				top,
 				&http2.Server{
 					IdleTimeout: 15 * time.Minute,
 				},
-- 
cgit 1.4.1