// ensureMongoServer ensures that mongo is installed and running,
// and ready for opening a state connection.
func (a *MachineAgent) ensureMongoServer(agentConfig agent.Config) (err error) {
a.mongoInitMutex.Lock()
defer a.mongoInitMutex.Unlock()
if a.mongoInitialized {
logger.Debugf("mongo is already initialized")
return nil
}
defer func() {
if err == nil {
a.mongoInitialized = true
}
}()
mongoInstalled, err := mongo.IsServiceInstalled()
if err != nil {
return errors.Annotate(err, "error while checking if mongodb service is installed")
}
if !mongoInstalled {
// EnsureMongoServer installs/upgrades the init config as necessary.
ensureServerParams, err := cmdutil.NewEnsureServerParams(agentConfig)
if err != nil {
return err
}
if err := cmdutil.EnsureMongoServer(ensureServerParams); err != nil {
return err
}
}
logger.Debugf("mongodb service is installed")
// Mongo is installed, record the version.
err = a.ChangeConfig(func(config agent.ConfigSetter) error {
config.SetMongoVersion(mongo.InstalledVersion())
return nil
})
if err != nil {
return errors.Annotate(err, "cannot set mongo version")
}
return nil
}
dumpName = "mongodump"
restoreName = "mongorestore"
)
// DBDumper is any type that dumps something to a dump dir.
type DBDumper interface {
// Dump something to dumpDir.
Dump(dumpDir string) error
}
var getMongodumpPath = func() (string, error) {
return getMongoToolPath(dumpName, os.Stat, exec.LookPath)
}
var getMongodPath = func() (string, error) {
return mongo.Path(mongo.InstalledVersion())
}
func getMongoToolPath(toolName string, stat func(name string) (os.FileInfo, error), lookPath func(file string) (string, error)) (string, error) {
mongod, err := getMongodPath()
if err != nil {
return "", errors.Annotate(err, "failed to get mongod path")
}
mongoTool := filepath.Join(filepath.Dir(mongod), toolName)
if _, err := stat(mongoTool); err == nil {
// It already exists so no need to continue.
return mongoTool, nil
}
path, err := lookPath(toolName)