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|
package service
import (
"errors"
"fmt"
"math/rand"
"os"
"strconv"
"strings"
"sync"
"time"
"git.server.ky/slackcoder/mirror/internal"
"git.server.ky/slackcoder/mirror/internal/github"
)
// These commands are required by the service to operate.
var requiredCommands = []string{
"git",
"rsync",
}
type Service struct {
cfg *Config
mirrorsLock sync.Mutex
mirrors []*Mirror
schedule []time.Time
stopCh chan struct{}
}
func NewService(cfg *Config) (*Service, error) {
// Apply defaults
cfg.Append(&DefaultConfig)
for _, cmd := range requiredCommands {
if err := internal.RequireCommand(cmd); err != nil {
return nil, err
}
}
srv := &Service{
cfg: cfg,
mirrors: nil,
stopCh: make(chan struct{}),
}
for _, m := range cfg.Mirrors {
err := srv.AddMirror(m)
if err != nil {
return nil, err
}
}
return srv, nil
}
func (s *Service) scheduleNextRun(arg *Mirror) {
// Be polite.
period := s.cfg.MaxInterval.Duration - s.cfg.MinInterval.Duration
at := time.Now().Add(s.cfg.MinInterval.Duration + time.Duration(rand.Intn(int(period))))
for i, m := range s.mirrors {
if m.Equal(arg) {
s.schedule[i] = at
}
}
}
func (s *Service) AddMirror(arg *Mirror) error {
defer s.mirrorsLock.Unlock()
s.mirrorsLock.Lock()
for _, m := range s.mirrors {
if m.Equal(arg) {
return errors.New("must be unique")
}
}
s.schedule = append(s.schedule, time.Time{})
s.mirrors = append(s.mirrors, arg)
s.scheduleNextRun(arg)
return nil
}
func (s *Service) scheduled(yield func(*Mirror) bool) {
defer s.mirrorsLock.Unlock()
s.mirrorsLock.Lock()
now := time.Now()
for i, m := range s.mirrors {
if s.schedule[i].After(now) {
continue
}
if !yield(m) {
break
}
}
}
func (s *Service) Mirror(arg *Mirror) error {
if arg.From.Path == "" || arg.To.Path == "" || arg.Method == "" {
return fmt.Errorf("badly formatted mirror '%s'", arg.String())
}
var err error
switch arg.Method {
case "git":
err = MirrorGit(arg.To, arg.From, arg.Description)
case "github-assets":
client := github.NewClient()
err = client.MirrorAssets(arg.To, arg.From)
case "rsync":
err = Rsync(arg.To, arg.From)
default:
err = fmt.Errorf("unknown method '%s'", arg.Method)
}
if err != nil {
return fmt.Errorf("could not clone from '%s': %w", arg.From, err)
}
return nil
}
func (s *Service) RemoveMirror(arg *Mirror) error {
defer s.mirrorsLock.Unlock()
s.mirrorsLock.Lock()
for i, m := range s.mirrors {
if m.Equal(arg) {
s.mirrors[i] = s.mirrors[len(s.mirrors)-1]
s.mirrors = s.mirrors[:len(s.mirrors)-1]
s.schedule[i] = s.schedule[len(s.schedule)-1]
s.schedule = s.schedule[:len(s.schedule)-1]
return nil
}
}
return errors.New("not found")
}
func (s *Service) Log(str string) {
escaped := []rune(strconv.Quote(strings.TrimSpace(str)))
escaped = escaped[1 : len(escaped)-1]
fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().Format(time.RFC822Z), string(escaped))
}
func (s *Service) Run() error {
wakeup := time.NewTicker(time.Second)
mainLoop:
for {
select {
case <-wakeup.C:
case <-s.stopCh:
break mainLoop
}
s.scheduled(func(m *Mirror) bool {
err := s.Mirror(m)
if err != nil {
s.Log(err.Error())
}
s.scheduleNextRun(m)
return true
})
}
return nil
}
func (s *Service) Stop() {
select {
case <-s.stopCh:
default:
close(s.stopCh)
}
}
|
