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tailscale/cmd/tsconnect/build.go

191 lines
4.9 KiB
Go

// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/fs"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"github.com/andybalholm/brotli"
esbuild "github.com/evanw/esbuild/pkg/api"
"golang.org/x/sync/errgroup"
)
func runBuild() {
buildOptions, err := commonSetup(prodMode)
if err != nil {
log.Fatalf("Cannot setup: %v", err)
}
if err := cleanDist(); err != nil {
log.Fatalf("Cannot clean %s: %v", *distDir, err)
}
buildOptions.Write = true
buildOptions.MinifyWhitespace = true
buildOptions.MinifyIdentifiers = true
buildOptions.MinifySyntax = true
buildOptions.EntryNames = "[dir]/[name]-[hash]"
buildOptions.AssetNames = "[name]-[hash]"
buildOptions.Metafile = true
log.Printf("Running esbuild...\n")
result := esbuild.Build(*buildOptions)
if len(result.Errors) > 0 {
log.Printf("ESBuild Error:\n")
for _, e := range result.Errors {
log.Printf("%v", e)
}
log.Fatal("Build failed")
}
if len(result.Warnings) > 0 {
log.Printf("ESBuild Warnings:\n")
for _, w := range result.Warnings {
log.Printf("%v", w)
}
}
// Preserve build metadata so we can extract hashed file names for serving.
metadataBytes, err := fixEsbuildMetadataPaths(result.Metafile)
if err != nil {
log.Fatalf("Cannot fix esbuild metadata paths: %v", err)
}
if err := ioutil.WriteFile(path.Join(*distDir, "/esbuild-metadata.json"), metadataBytes, 0666); err != nil {
log.Fatalf("Cannot write metadata: %v", err)
}
if er := precompressDist(); err != nil {
log.Fatalf("Cannot precompress resources: %v", er)
}
}
// fixEsbuildMetadataPaths re-keys the esbuild metadata file to use paths
// relative to the dist directory (it normally uses paths relative to the cwd,
// which are akward if we're running with a different cwd at serving time).
func fixEsbuildMetadataPaths(metadataStr string) ([]byte, error) {
var metadata EsbuildMetadata
if err := json.Unmarshal([]byte(metadataStr), &metadata); err != nil {
return nil, fmt.Errorf("Cannot parse metadata: %w", err)
}
distAbsPath, err := filepath.Abs(*distDir)
if err != nil {
return nil, fmt.Errorf("Cannot get absolute path from %s: %w", *distDir, err)
}
for outputPath, output := range metadata.Outputs {
outputAbsPath, err := filepath.Abs(outputPath)
if err != nil {
return nil, fmt.Errorf("Cannot get absolute path from %s: %w", outputPath, err)
}
outputRelPath, err := filepath.Rel(distAbsPath, outputAbsPath)
if err != nil {
return nil, fmt.Errorf("Cannot get relative path from %s: %w", outputRelPath, err)
}
delete(metadata.Outputs, outputPath)
metadata.Outputs[outputRelPath] = output
}
return json.Marshal(metadata)
}
// cleanDist removes files from the dist build directory, except the placeholder
// one that we keep to make sure Git still creates the directory.
func cleanDist() error {
log.Printf("Cleaning %s...\n", *distDir)
files, err := os.ReadDir(*distDir)
if err != nil {
if os.IsNotExist(err) {
return os.MkdirAll(*distDir, 0755)
}
return err
}
for _, file := range files {
if file.Name() != "placeholder" {
if err := os.Remove(filepath.Join(*distDir, file.Name())); err != nil {
return err
}
}
}
return nil
}
func precompressDist() error {
log.Printf("Pre-compressing files in %s/...\n", *distDir)
var eg errgroup.Group
err := fs.WalkDir(os.DirFS(*distDir), ".", func(p string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
if !compressibleExtensions[filepath.Ext(p)] {
return nil
}
p = path.Join(*distDir, p)
log.Printf("Pre-compressing %v\n", p)
eg.Go(func() error {
return precompress(p)
})
return nil
})
if err != nil {
return err
}
return eg.Wait()
}
var compressibleExtensions = map[string]bool{
".js": true,
".css": true,
".wasm": true,
}
func precompress(path string) error {
contents, err := os.ReadFile(path)
if err != nil {
return err
}
fi, err := os.Lstat(path)
if err != nil {
return err
}
err = writeCompressed(contents, func(w io.Writer) (io.WriteCloser, error) {
return gzip.NewWriterLevel(w, gzip.BestCompression)
}, path+".gz", fi.Mode())
if err != nil {
return err
}
return writeCompressed(contents, func(w io.Writer) (io.WriteCloser, error) {
return brotli.NewWriterLevel(w, brotli.BestCompression), nil
}, path+".br", fi.Mode())
}
func writeCompressed(contents []byte, compressedWriterCreator func(io.Writer) (io.WriteCloser, error), outputPath string, outputMode fs.FileMode) error {
var buf bytes.Buffer
compressedWriter, err := compressedWriterCreator(&buf)
if err != nil {
return err
}
if _, err := compressedWriter.Write(contents); err != nil {
return err
}
if err := compressedWriter.Close(); err != nil {
return err
}
return os.WriteFile(outputPath, buf.Bytes(), outputMode)
}