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|
package service
import (
"errors"
"fmt"
"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",
}
// Service data associated with each mirror.
type mirrorRecord struct {
*Mirror
LastRun time.Time
NextRun time.Time
}
func (s *mirrorRecord) String() string {
return fmt.Sprintf("%s: %s -> %s at %s", s.Method, s.From, s.To, s.NextRun.Format(time.Kitchen))
}
type Service struct {
cfg *Config
mirrorsLock sync.Mutex
mirrors []*mirrorRecord
stopCh chan struct{}
}
func NewService(arg *Config) (*Service, error) {
// Apply defaults
var cfg Config
cfg.Append(&DefaultConfig)
cfg.Append(arg)
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) 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")
}
}
record := &mirrorRecord{
Mirror: arg,
NextRun: time.Now().Add(RandomDuration(*s.cfg.MinInterval, *s.cfg.MaxInterval).Duration),
}
s.mirrors = append(s.mirrors, record)
return nil
}
func (s *Service) scheduled(yield func(*mirrorRecord) bool) {
defer s.mirrorsLock.Unlock()
s.mirrorsLock.Lock()
now := time.Now()
for _, m := range s.mirrors {
if m.NextRun.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()
index := -1
for i, m := range s.mirrors {
if m.Equal(arg) {
index = i
break
}
}
if index == -1 {
return errors.New("not found")
}
s.mirrors[index] = s.mirrors[len(s.mirrors)-1]
s.mirrors = s.mirrors[:len(s.mirrors)-1]
return nil
}
// Reload reloads the service with the given configuration.
func (s *Service) Reload(arg *Config) {
s.mirrorsLock.Lock()
defer s.mirrorsLock.Unlock()
var cfg Config
cfg.Append(&DefaultConfig)
cfg.Append(arg)
s.cfg = &cfg
mirrorsByDest := make(map[string]*mirrorRecord)
for _, m := range s.mirrors {
mirrorsByDest[m.To.String()] = m
}
mirrors := make([]*mirrorRecord, 0)
for _, m := range cfg.Mirrors {
oldM, ok := mirrorsByDest[m.To.String()]
if !ok {
mirrors = append(
mirrors,
&mirrorRecord{
Mirror: m,
LastRun: time.Time{},
NextRun: time.Now().Add(RandomDuration(*s.cfg.MinInterval, *s.cfg.MaxInterval).Duration),
},
)
continue
}
delete(mirrorsByDest, m.To.String())
lastRun := oldM.LastRun
if lastRun.IsZero() {
lastRun = time.Now()
}
untilNextRun := Duration{oldM.NextRun.Sub(lastRun)}
untilNextRun = cfg.MinInterval.Max(&untilNextRun)
untilNextRun = cfg.MaxInterval.Min(&untilNextRun)
// Records match up.
record := mirrorRecord{
Mirror: m,
LastRun: oldM.LastRun,
NextRun: time.Now().Add(untilNextRun.Duration),
}
mirrors = append(
mirrors,
&record,
)
}
s.mirrors = mirrors
}
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 *mirrorRecord) bool {
err := s.Mirror(m.Mirror)
if err != nil {
s.Log(err.Error())
}
m.LastRun = time.Now()
m.NextRun = time.Now().Add(RandomDuration(*s.cfg.MinInterval, *s.cfg.MaxInterval).Duration)
return true
})
}
return nil
}
func (s *Service) Stop() {
select {
case <-s.stopCh:
default:
close(s.stopCh)
}
}
|
