139 lines
3 KiB
Go
139 lines
3 KiB
Go
package main
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import (
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"context"
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"embed"
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"fmt"
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"html/template"
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"log/slog"
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"net"
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"net/http"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"time"
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"unicode"
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"golang.org/x/text/runes"
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"golang.org/x/text/transform"
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"golang.org/x/text/unicode/norm"
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)
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//go:embed ods.txt
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var ods string
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//go:embed index.html
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var templatesFS embed.FS
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//go:embed static/*
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var static embed.FS
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// html templates
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var indexTemplate = template.Must(template.New("index").ParseFS(templatesFS, "index.html"))
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type IndexData struct {
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Invalid bool
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Query string
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}
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func getIndex() http.Handler {
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data := IndexData{
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Query: "",
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Invalid: true,
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Cache-Control", "no-store, no-cache")
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indexTemplate.ExecuteTemplate(w, "index.html", data)
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})
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}
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func postIndex() http.Handler {
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normalizer := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
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words := strings.Split(ods, "\n")
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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data := IndexData{
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Query: r.FormValue("query"),
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Invalid: true,
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}
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query, _, _ := transform.String(normalizer, strings.TrimSpace(strings.ToUpper(data.Query)))
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for _, w := range words {
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if w == query {
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data.Invalid = false
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break
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}
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}
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slog.Info("post", "word", query, "invalid", data.Invalid)
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indexTemplate.ExecuteTemplate(w, "index.html", data)
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})
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}
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func run(
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ctx context.Context,
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getenv func(string) string,
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) error {
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ctx, cancel := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGTERM)
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defer cancel()
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mux := http.NewServeMux()
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mux.Handle("GET /static/", http.FileServer(http.FS(static)))
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mux.Handle("GET /", getIndex())
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mux.Handle("POST /", postIndex())
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host := getenv("ODS_HOST")
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if host == "" {
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host = "127.0.0.1"
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}
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port := getenv("ODS_PORT")
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if port == "" {
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port = "8080"
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}
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httpServer := &http.Server{
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Addr: net.JoinHostPort(host, port),
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Handler: mux,
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}
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errChan := make(chan error, 1)
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go func() {
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slog.Info("backend http server listening", "address", httpServer.Addr)
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if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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errChan <- fmt.Errorf("error listening and serving backend http server on %s: %w", httpServer.Addr, err)
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}
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}()
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select {
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case err := <-errChan:
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return err
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case <-ctx.Done():
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slog.Info("backend http server shutting down")
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shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer shutdownCancel()
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if err := httpServer.Shutdown(shutdownCtx); err != nil {
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return fmt.Errorf("error shutting down backend http server: %w", err)
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}
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}
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return nil
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}
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func main() {
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ctx := context.Background()
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var opts *slog.HandlerOptions
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if os.Getenv("ODS_DEBUG") != "" {
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opts = &slog.HandlerOptions{
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AddSource: true,
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Level: slog.LevelDebug,
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}
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}
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logger := slog.New(slog.NewJSONHandler(os.Stdout, opts))
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slog.SetDefault(logger)
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if err := run(
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ctx,
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os.Getenv,
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); err != nil {
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fmt.Fprintf(os.Stderr, "%+v\n", err)
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os.Exit(1)
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}
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}
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