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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package web
import (
"log"
"net/http"
"net/http/httputil"
"net/url"
"os"
"os/exec"
"path/filepath"
"strings"
)
// startDevServer starts the JS dev server that does on-demand rebuilding
// and serving of web client JS and CSS resources.
func (s *Server) startDevServer() (cleanup func()) {
root := gitRootDir()
webClientPath := filepath.Join(root, "client", "web")
yarn := filepath.Join(root, "tool", "yarn")
node := filepath.Join(root, "tool", "node")
vite := filepath.Join(webClientPath, "node_modules", ".bin", "vite")
log.Printf("installing JavaScript deps using %s... (might take ~30s)", yarn)
out, err := exec.Command(yarn, "--non-interactive", "-s", "--cwd", webClientPath, "install").CombinedOutput()
if err != nil {
log.Fatalf("error running tailscale web's yarn install: %v, %s", err, out)
}
log.Printf("starting JavaScript dev server...")
cmd := exec.Command(node, vite)
cmd.Dir = webClientPath
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
log.Fatalf("Starting JS dev server: %v", err)
}
log.Printf("JavaScript dev server running as pid %d", cmd.Process.Pid)
return func() {
cmd.Process.Signal(os.Interrupt)
err := cmd.Wait()
log.Printf("JavaScript dev server exited: %v", err)
}
}
func (s *Server) addProxyToDevServer() {
if !s.devMode {
return // only using Vite proxy in dev mode
}
// We use Vite to develop on the web client.
// Vite starts up its own local server for development,
// which we proxy requests to from Server.ServeHTTP.
// Here we set up the proxy to Vite's server.
handleErr := func(w http.ResponseWriter, r *http.Request, err error) {
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusBadGateway)
w.Write([]byte("The web client development server isn't running. " +
"Run `./tool/yarn --cwd client/web start` from " +
"the repo root to start the development server."))
w.Write([]byte("\n\nError: " + err.Error()))
}
viteTarget, _ := url.Parse("http://127.0.0.1:4000")
s.devProxy = httputil.NewSingleHostReverseProxy(viteTarget)
s.devProxy.ErrorHandler = handleErr
}
func gitRootDir() string {
top, err := exec.Command("git", "rev-parse", "--show-toplevel").Output()
if err != nil {
log.Fatalf("failed to find git top level (not in corp git?): %v", err)
}
return strings.TrimSpace(string(top))
}
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