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debug.go
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debug.go
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/*
* Copyright 2018 Yuji Ito <llamerada.jp@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package seed
import (
"fmt"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/fsnotify/fsnotify"
)
const rootPath = "."
func InitDebug(mux *http.ServeMux) error {
dfw, err := newDebugFileWatcher(rootPath)
if err != nil {
return err
}
go func() {
for {
err := dfw.wait()
if err != nil {
log.Fatal(err)
}
time.Sleep(time.Second * 1)
err = build(rootPath)
if err != nil {
log.Print("failed to build:", err)
} else {
os.Exit(0)
}
}
}()
return nil
}
func build(rootPath string) error {
outs, err := execHelper(".", "make", []string{"build", "-C", rootPath})
for _, out := range outs {
fmt.Println(out)
}
return err
}
type debugFileWatcher struct {
rootPath string
watched []string
watcher *fsnotify.Watcher
}
func newDebugFileWatcher(rootPath string) (*debugFileWatcher, error) {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
return &debugFileWatcher{
rootPath: rootPath,
watched: make([]string, 0),
watcher: watcher,
}, nil
}
func (w *debugFileWatcher) wait() error {
isFirst := true
for {
work1, err := execHelper(w.rootPath, "git", []string{"ls-files"})
if err != nil {
return err
}
work2, err := execHelper(w.rootPath, "git", []string{"ls-files", "--exclude-standard", "-o"})
if err != nil {
return err
}
updated := false
for _, file := range append(work1, work2...) {
ignored := false
for _, watched := range w.watched {
if file == watched {
ignored = true
break
}
}
if !ignored {
w.watched = append(w.watched, file)
w.watcher.Add(filepath.Join(w.rootPath, file))
updated = true
}
}
if !isFirst && updated {
break
}
isFirst = false
event, ok := <-w.watcher.Events
if ok && event.Op&fsnotify.Write != 0 {
return nil
}
}
return nil
}
func execHelper(path, command string, args []string) ([]string, error) {
cmd := exec.Command(command, args...)
cmd.Dir = path
out, err := cmd.CombinedOutput()
if err != nil {
fmt.Println(string(out))
return nil, fmt.Errorf("error on execHelper %v", map[string]interface{}{
"path": path,
"command": command,
"args": args,
})
}
return strings.Split(string(out), "\n"), nil
}