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service.go
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service.go
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package settings
import (
"encoding/json"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshlog "github.com/cloudfoundry/bosh-utils/logger"
boshsys "github.com/cloudfoundry/bosh-utils/system"
"sync"
)
type Service interface {
LoadSettings() error
// GetSettings does not return error because without settings Agent cannot start.
GetSettings() Settings
GetPersistentDiskSettings(diskCID string) (DiskSettings, error)
GetAllPersistentDiskSettings() (map[string]DiskSettings, error)
SavePersistentDiskSettings(DiskSettings) error
RemovePersistentDiskSettings(string) error
PublicSSHKeyForUsername(string) (string, error)
InvalidateSettings() error
}
const settingsServiceLogTag = "settingsService"
type settingsService struct {
fs boshsys.FileSystem
settingsPath string
settings Settings
settingsMutex sync.Mutex
persistentDiskSettingsPath string
persistentDiskSettingsMutex sync.Mutex
settingsSource Source
defaultNetworkResolver DefaultNetworkResolver
logger boshlog.Logger
}
type DefaultNetworkResolver interface {
// Ideally we would find a network based on a MAC address
// but current CPI implementations do not include it
GetDefaultNetwork() (Network, error)
}
func NewService(
fs boshsys.FileSystem,
settingsPath string,
persistentDiskSettingsPath string,
settingsSource Source,
defaultNetworkResolver DefaultNetworkResolver,
logger boshlog.Logger,
) Service {
return &settingsService{
fs: fs,
settingsPath: settingsPath,
settings: Settings{},
persistentDiskSettingsPath: persistentDiskSettingsPath,
settingsSource: settingsSource,
defaultNetworkResolver: defaultNetworkResolver,
logger: logger,
}
}
func (s *settingsService) PublicSSHKeyForUsername(username string) (string, error) {
return s.settingsSource.PublicSSHKeyForUsername(username)
}
func (s *settingsService) LoadSettings() error {
s.logger.Debug(settingsServiceLogTag, "Loading settings from fetcher")
newSettings, fetchErr := s.settingsSource.Settings()
if fetchErr != nil {
s.logger.Error(settingsServiceLogTag, "Failed loading settings via fetcher: %v", fetchErr)
opts := boshsys.ReadOpts{Quiet: true}
existingSettingsJSON, readError := s.fs.ReadFileWithOpts(s.settingsPath, opts)
if readError != nil {
s.logger.Error(settingsServiceLogTag, "Failed reading settings from file %s", readError.Error())
return bosherr.WrapError(fetchErr, "Invoking settings fetcher")
}
s.logger.Debug(settingsServiceLogTag, "Successfully read settings from file")
cachedSettings := Settings{}
err := json.Unmarshal(existingSettingsJSON, &cachedSettings)
if err != nil {
s.logger.Error(settingsServiceLogTag, "Failed unmarshalling settings from file %s", err.Error())
return bosherr.WrapError(fetchErr, "Invoking settings fetcher")
}
s.settingsMutex.Lock()
s.settings = cachedSettings
s.settingsMutex.Unlock()
return nil
}
s.logger.Debug(settingsServiceLogTag, "Successfully received settings from fetcher")
s.settingsMutex.Lock()
s.settings = newSettings
s.settingsMutex.Unlock()
newSettingsJSON, err := json.Marshal(newSettings)
if err != nil {
return bosherr.WrapError(err, "Marshalling settings json")
}
err = s.fs.WriteFileQuietly(s.settingsPath, newSettingsJSON)
if err != nil {
return bosherr.WrapError(err, "Writing setting json")
}
return nil
}
func (s *settingsService) GetAllPersistentDiskSettings() (map[string]DiskSettings, error) {
s.persistentDiskSettingsMutex.Lock()
defer s.persistentDiskSettingsMutex.Unlock()
allPersistentDiskSettings := map[string]DiskSettings{}
settings := s.GetSettings()
for diskCID, settings := range settings.Disks.Persistent {
allPersistentDiskSettings[diskCID] = s.settings.populatePersistentDiskSettings(diskCID, settings)
}
persistentDiskSettings, err := s.getPersistentDiskSettingsWithoutLocking()
if err != nil {
return nil, bosherr.WrapError(err, "Reading persistent disk settings")
}
for diskCID, settings := range persistentDiskSettings {
allPersistentDiskSettings[diskCID] = settings
}
return allPersistentDiskSettings, nil
}
func (s *settingsService) GetPersistentDiskSettings(diskCID string) (DiskSettings, error) {
allDiskSettings, err := s.GetAllPersistentDiskSettings()
if err != nil {
return DiskSettings{}, bosherr.WrapError(err, "Getting all persistent disk settings")
}
settings, hasDiskSettings := allDiskSettings[diskCID]
if !hasDiskSettings {
return DiskSettings{}, bosherr.Errorf("Persistent disk with volume id '%s' could not be found", diskCID)
}
return settings, nil
}
func (s *settingsService) RemovePersistentDiskSettings(diskID string) error {
s.persistentDiskSettingsMutex.Lock()
defer s.persistentDiskSettingsMutex.Unlock()
persistentDiskSettings, err := s.getPersistentDiskSettingsWithoutLocking()
if err != nil {
return bosherr.WrapError(err, "Cannot remove entry from file due to read error")
}
delete(persistentDiskSettings, diskID)
if err := s.savePersistentDiskSettingsWithoutLocking(persistentDiskSettings); err != nil {
return bosherr.WrapError(err, "Saving persistent disk settings")
}
return nil
}
func (s *settingsService) SavePersistentDiskSettings(newDiskSettings DiskSettings) error {
s.persistentDiskSettingsMutex.Lock()
defer s.persistentDiskSettingsMutex.Unlock()
persistentDiskSettings, err := s.getPersistentDiskSettingsWithoutLocking()
if err != nil {
return bosherr.WrapError(err, "Reading all persistent disk settings")
}
persistentDiskSettings[newDiskSettings.ID] = newDiskSettings
if err := s.savePersistentDiskSettingsWithoutLocking(persistentDiskSettings); err != nil {
return bosherr.WrapError(err, "Saving persistent disk settings")
}
return nil
}
// GetSettings returns setting even if it fails to resolve IPs for dynamic networks.
func (s *settingsService) GetSettings() Settings {
s.settingsMutex.Lock()
settingsCopy := s.settings
if s.settings.Networks != nil {
settingsCopy.Networks = make(map[string]Network)
}
for networkName, network := range s.settings.Networks {
settingsCopy.Networks[networkName] = network
}
s.settingsMutex.Unlock()
for networkName, network := range settingsCopy.Networks {
if !network.IsDHCP() {
continue
}
resolvedNetwork, err := s.resolveNetwork(network)
if err != nil {
break
}
settingsCopy.Networks[networkName] = resolvedNetwork
}
return settingsCopy
}
func (s *settingsService) InvalidateSettings() error {
err := s.fs.RemoveAll(s.settingsPath)
if err != nil {
return bosherr.WrapError(err, "Removing settings file")
}
return nil
}
func (s *settingsService) resolveNetwork(network Network) (Network, error) {
// Ideally this would be GetNetworkByMACAddress(mac string)
// Currently, we are relying that if the default network does not contain
// the MAC adddress the InterfaceConfigurationCreator will fail.
resolvedNetwork, err := s.defaultNetworkResolver.GetDefaultNetwork()
if err != nil {
s.logger.Error(settingsServiceLogTag, "Failed retrieving default network %s", err.Error())
return Network{}, bosherr.WrapError(err, "Failed retrieving default network")
}
// resolvedNetwork does not have all information for a network
network.IP = resolvedNetwork.IP
network.Netmask = resolvedNetwork.Netmask
network.Gateway = resolvedNetwork.Gateway
network.Resolved = true
return network, nil
}
func (s *settingsService) savePersistentDiskSettingsWithoutLocking(persistentDiskSettings map[string]DiskSettings) error {
newPersistentDiskSettingsJSON, err := json.Marshal(persistentDiskSettings)
if err != nil {
return bosherr.WrapError(err, "Marshalling persistent disk settings json")
}
err = s.fs.WriteFile(s.persistentDiskSettingsPath, newPersistentDiskSettingsJSON)
if err != nil {
return bosherr.WrapError(err, "Writing persistent disk settings settings json")
}
return nil
}
func (s *settingsService) getPersistentDiskSettingsWithoutLocking() (map[string]DiskSettings, error) {
persistentDiskSettings := make(map[string]DiskSettings)
if s.fs.FileExists(s.persistentDiskSettingsPath) {
opts := boshsys.ReadOpts{Quiet: true}
existingSettingsJSON, readError := s.fs.ReadFileWithOpts(s.persistentDiskSettingsPath, opts)
if readError != nil {
return nil, bosherr.WrapError(readError, "Reading persistent disk settings from file")
}
err := json.Unmarshal(existingSettingsJSON, &persistentDiskSettings)
if err != nil {
return nil, bosherr.WrapError(err, "Unmarshalling persistent disk settings from file")
}
}
return persistentDiskSettings, nil
}