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cloudbox/sync/logic.go

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package sync
import log "github.com/sirupsen/logrus"
func (s *Sync) decideAction(syncState *state, fileName string) error {
var (
change = syncState.GetChangeFor(fileName)
logger = log.WithField("filename", fileName)
)
switch {
case !change.Changed():
// No changes at all: Get out of here
logger.Debug("File in sync")
return nil
case change.HasAll(ChangeLocalUpdate, ChangeRemoteUpdate):
// We do have local and remote changes: Check both are now the same or leave this to manual resolve
logger.Warn("File has local and remote updates, sync not possible")
case change.HasAll(ChangeLocalAdd, ChangeRemoteAdd):
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// Special case: Both are added, check they are the same file or leave this to manual resolve
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logger.Debug("File added locally as well as remotely")
// TODO: Handle special case
case change.HasAll(ChangeLocalDelete, ChangeRemoteDelete):
// Special case: Both vanished, we just need to clean up the sync cache
logger.Debug("File deleted locally as well as remotely")
if err := s.deleteDBFileInfo(sideLocal, fileName); err != nil {
logger.WithError(err).Error("Unable to delete local file info")
return nil
}
if err := s.deleteDBFileInfo(sideRemote, fileName); err != nil {
logger.WithError(err).Error("Unable to delete remote file info")
return nil
}
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case change.Is(ChangeLocalAdd) || change.Is(ChangeLocalUpdate):
logger.Debug("File added or changed locally, uploading...")
if err := s.transferFile(s.local, s.remote, sideLocal, sideRemote, fileName); err != nil {
logger.WithError(err).Error("Unable to upload file")
}
case change.Is(ChangeLocalDelete):
logger.Debug("File deleted locally, removing from remote...")
if err := s.deleteFile(s.remote, fileName); err != nil {
logger.WithError(err).Error("Unable to delete file from remote")
}
case change.Is(ChangeRemoteAdd) || change.Is(ChangeRemoteUpdate):
logger.Debug("File added or changed remotely, downloading...")
if err := s.transferFile(s.remote, s.local, sideRemote, sideLocal, fileName); err != nil {
logger.WithError(err).Error("Unable to download file")
}
case change.Is(ChangeRemoteDelete):
logger.Debug("File deleted remotely, removing from local...")
if err := s.deleteFile(s.local, fileName); err != nil {
logger.WithError(err).Error("Unable to delete file from local")
}
default:
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// Unhandled case (i.e. human screwed around in sync process)
// Stuff like: LocalUpdate + RemoteDelete, ...
logger.WithField("change", change.String()).Warn("Unhandled change case, sync not possible")
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}
return nil
}