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// Copyright 2023 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package common
import (
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"time"
"dawn.googlesource.com/dawn/tools/src/fileutils"
)
type Builder struct {
Name string // 'standalone', 'node'
Out string // Absolute path to the output directory
CTS string // Absolute path to the CTS root directory
npx string // Path to the npx executable
}
// BuildIfRequired calls Build() if the CTS sources have been modified since the last build.
func (b *Builder) BuildIfRequired(verbose bool) error {
name := fmt.Sprintf("CTS-%v", b.Name)
// Scan the CTS source to determine the most recent change to the CTS source
mostRecentSourceChange, err := scanSourceTimestamps(filepath.Join(b.Out, "../src"), verbose)
if err != nil {
return fmt.Errorf("failed to scan source files for modified timestamps: %w", err)
}
type Cache struct {
BuildTimestamp map[string]time.Time // name -> most recent timestamp
}
cache := Cache{BuildTimestamp: map[string]time.Time{}}
cachePath := ""
if home, err := os.UserHomeDir(); err == nil {
cacheDir := filepath.Join(home, ".cache/webgpu")
cachePath = filepath.Join(cacheDir, "run-cts.json")
os.MkdirAll(cacheDir, 0777)
}
needsRebuild := true
if cachePath != "" { // consult the cache to see if we need to rebuild
if cacheFile, err := os.Open(cachePath); err == nil {
if err := json.NewDecoder(cacheFile).Decode(&cache); err == nil {
if fileutils.IsDir(b.Out) {
needsRebuild = mostRecentSourceChange.After(cache.BuildTimestamp[b.Name])
}
}
cacheFile.Close()
}
}
if verbose {
fmt.Println(name, "needs rebuild:", needsRebuild)
}
if needsRebuild {
if err := b.Build(verbose); err != nil {
return fmt.Errorf("failed to build %v: %w", name, err)
}
}
if cachePath != "" {
// Update the cache timestamp
if cacheFile, err := os.Create(cachePath); err == nil {
cache.BuildTimestamp[b.Name] = mostRecentSourceChange
json.NewEncoder(cacheFile).Encode(&cache)
cacheFile.Close()
}
}
return nil
}
// Build executes the necessary build commands to build the CTS, including
// copying the cache files from gen to the out directory and compiling the
// TypeScript files down to JavaScript.
func (b *Builder) Build(verbose bool) error {
if verbose {
start := time.Now()
fmt.Printf("Building CTS %v...\n", b.Name)
defer func() {
fmt.Println("completed in", time.Since(start))
}()
}
if err := os.MkdirAll(b.Out, 0777); err != nil {
return err
}
for _, action := range []string{"run:generate-version", b.Name} {
cmd := exec.Command(b.npx, "grunt", action)
cmd.Dir = b.CTS
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %v", err, string(out))
}
if verbose {
fmt.Println(string(out))
}
}
return nil
}