tailscale/cmd/tsconnect/common.go

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// 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 (
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strconv"
"time"
esbuild "github.com/evanw/esbuild/pkg/api"
"golang.org/x/exp/slices"
)
const (
devMode = true
prodMode = false
)
// commonSetup performs setup that is common to both dev and build modes.
func commonSetup(dev bool) (*esbuild.BuildOptions, error) {
// Change cwd to to where this file lives -- that's where all inputs for
// esbuild and other build steps live.
if _, filename, _, ok := runtime.Caller(0); ok {
if err := os.Chdir(path.Dir(filename)); err != nil {
return nil, fmt.Errorf("Cannot change cwd: %w", err)
}
}
if err := installJSDeps(); err != nil {
return nil, fmt.Errorf("Cannot install JS deps: %w", err)
}
return &esbuild.BuildOptions{
EntryPoints: []string{"src/app/index.ts", "src/app/index.css"},
Outdir: *distDir,
Bundle: true,
Sourcemap: esbuild.SourceMapLinked,
LogLevel: esbuild.LogLevelInfo,
Define: map[string]string{"DEBUG": strconv.FormatBool(dev)},
Target: esbuild.ES2017,
Plugins: []esbuild.Plugin{
{
Name: "tailscale-tailwind",
Setup: func(build esbuild.PluginBuild) {
setupEsbuildTailwind(build, dev)
},
},
{
Name: "tailscale-go-wasm-exec-js",
Setup: setupEsbuildWasmExecJS,
},
{
Name: "tailscale-wasm",
Setup: func(build esbuild.PluginBuild) {
setupEsbuildWasm(build, dev)
},
},
},
JSXMode: esbuild.JSXModeAutomatic,
}, nil
}
// cleanDir removes files from dirPath, except the ones specified by
// preserveFiles.
func cleanDir(dirPath string, preserveFiles ...string) error {
log.Printf("Cleaning %s...\n", dirPath)
files, err := os.ReadDir(dirPath)
if err != nil {
if os.IsNotExist(err) {
return os.MkdirAll(dirPath, 0755)
}
return err
}
for _, file := range files {
if !slices.Contains(preserveFiles, file.Name()) {
if err := os.Remove(filepath.Join(dirPath, file.Name())); err != nil {
return err
}
}
}
return nil
}
func runEsbuild(buildOptions esbuild.BuildOptions) esbuild.BuildResult {
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)
}
}
return result
}
// setupEsbuildWasmExecJS generates an esbuild plugin that serves the current
// wasm_exec.js runtime helper library from the Go toolchain.
func setupEsbuildWasmExecJS(build esbuild.PluginBuild) {
wasmExecSrcPath := filepath.Join(runtime.GOROOT(), "misc", "wasm", "wasm_exec.js")
build.OnResolve(esbuild.OnResolveOptions{
Filter: "./wasm_exec$",
}, func(args esbuild.OnResolveArgs) (esbuild.OnResolveResult, error) {
return esbuild.OnResolveResult{Path: wasmExecSrcPath}, nil
})
}
// setupEsbuildWasm generates an esbuild plugin that builds the Tailscale wasm
// binary and serves it as a file that the JS can load.
func setupEsbuildWasm(build esbuild.PluginBuild, dev bool) {
// Add a resolve hook to convince esbuild that the path exists.
build.OnResolve(esbuild.OnResolveOptions{
Filter: "./main.wasm$",
}, func(args esbuild.OnResolveArgs) (esbuild.OnResolveResult, error) {
return esbuild.OnResolveResult{
Path: "./src/main.wasm",
Namespace: "generated",
}, nil
})
build.OnLoad(esbuild.OnLoadOptions{
Filter: "./src/main.wasm$",
}, func(args esbuild.OnLoadArgs) (esbuild.OnLoadResult, error) {
contents, err := buildWasm(dev)
if err != nil {
return esbuild.OnLoadResult{}, fmt.Errorf("Cannot build main.wasm: %w", err)
}
contentsStr := string(contents)
return esbuild.OnLoadResult{
Contents: &contentsStr,
Loader: esbuild.LoaderFile,
}, nil
})
}
func buildWasm(dev bool) ([]byte, error) {
start := time.Now()
outputFile, err := ioutil.TempFile("", "main.*.wasm")
if err != nil {
return nil, fmt.Errorf("Cannot create main.wasm output file: %w", err)
}
outputPath := outputFile.Name()
defer os.Remove(outputPath)
args := []string{"build", "-tags", "tailscale_go,osusergo,netgo,nethttpomithttp2,omitidna,omitpemdecrypt"}
if !dev {
if *devControl != "" {
return nil, fmt.Errorf("Development control URL can only be used in dev mode.")
}
// Omit long paths and debug symbols in release builds, to reduce the
// generated WASM binary size.
args = append(args, "-trimpath", "-ldflags", "-s -w")
} else if *devControl != "" {
args = append(args, "-ldflags", fmt.Sprintf("-X 'main.ControlURL=%v'", *devControl))
}
args = append(args, "-o", outputPath, "./wasm")
cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
cmd.Env = append(os.Environ(), "GOOS=js", "GOARCH=wasm")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err = cmd.Run()
if err != nil {
return nil, fmt.Errorf("Cannot build main.wasm: %w", err)
}
log.Printf("Built wasm in %v\n", time.Since(start))
return os.ReadFile(outputPath)
}
// installJSDeps installs the JavaScript dependencies specified by package.json
func installJSDeps() error {
log.Printf("Installing JS deps...\n")
return runYarn()
}
func runYarn(args ...string) error {
cmd := exec.Command(*yarnPath, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
// EsbuildMetadata is the subset of metadata struct (described by
// https://esbuild.github.io/api/#metafile) that we care about for mapping
// from entry points to hashed file names.
type EsbuildMetadata struct {
Outputs map[string]struct {
Inputs map[string]struct {
BytesInOutput int64 `json:"bytesInOutput"`
} `json:"inputs,omitempty"`
EntryPoint string `json:"entryPoint,omitempty"`
} `json:"outputs,omitempty"`
}
func setupEsbuildTailwind(build esbuild.PluginBuild, dev bool) {
build.OnLoad(esbuild.OnLoadOptions{
Filter: "./src/.*\\.css$",
}, func(args esbuild.OnLoadArgs) (esbuild.OnLoadResult, error) {
start := time.Now()
yarnArgs := []string{"--silent", "tailwind", "-i", args.Path}
if !dev {
yarnArgs = append(yarnArgs, "--minify")
}
cmd := exec.Command(*yarnPath, yarnArgs...)
tailwindOutput, err := cmd.Output()
log.Printf("Ran tailwind in %v\n", time.Since(start))
if err != nil {
if exitErr, ok := err.(*exec.ExitError); ok {
log.Printf("Tailwind stderr: %s", exitErr.Stderr)
}
return esbuild.OnLoadResult{}, fmt.Errorf("Cannot run tailwind: %w", err)
}
tailwindOutputStr := string(tailwindOutput)
return esbuild.OnLoadResult{
Contents: &tailwindOutputStr,
Loader: esbuild.LoaderCSS,
}, nil
})
}