// newHost returns an initialized Host, taking a set of dependencies as input.
// By making the dependencies an argument of the 'new' call, the host can be
// mocked such that the dependencies can return unexpected errors or unique
// behaviors during testing, enabling easier testing of the failure modes of
// the Host.
func newHost(dependencies dependencies, cs modules.ConsensusSet, tpool modules.TransactionPool, wallet modules.Wallet, listenerAddress string, persistDir string) (*Host, error) {
// Check that all the dependencies were provided.
if cs == nil {
return nil, errNilCS
}
if tpool == nil {
return nil, errNilTpool
}
if wallet == nil {
return nil, errNilWallet
}
// Create the host object.
h := &Host{
cs: cs,
tpool: tpool,
wallet: wallet,
dependencies: dependencies,
lockedStorageObligations: make(map[types.FileContractID]*siasync.TryMutex),
persistDir: persistDir,
}
// Call stop in the event of a partial startup.
var err error
defer func() {
if err != nil {
err = composeErrors(h.tg.Stop(), err)
}
}()
// Create the perist directory if it does not yet exist.
err = dependencies.mkdirAll(h.persistDir, 0700)
if err != nil {
return nil, err
}
// Initialize the logger, and set up the stop call that will close the
// logger.
h.log, err = dependencies.newLogger(filepath.Join(h.persistDir, logFile))
if err != nil {
return nil, err
}
h.tg.AfterStop(func() {
err = h.log.Close()
if err != nil {
// State of the logger is uncertain, a Println will have to
// suffice.
fmt.Println("Error when closing the logger:", err)
}
})
// Add the storage manager to the host, and set up the stop call that will
// close the storage manager.
h.StorageManager, err = storagemanager.New(filepath.Join(persistDir, "storagemanager"))
if err != nil {
h.log.Println("Could not open the storage manager:", err)
return nil, err
}
h.tg.AfterStop(func() {
err = h.StorageManager.Close()
if err != nil {
h.log.Println("Could not close storage manager:", err)
}
})
// After opening the database, it must be initialized. Most commonly,
// nothing happens. But for new databases, a set of buckets must be
// created. Initialization is also a good time to run sanity checks.
err = h.initDB()
if err != nil {
h.log.Println("Could not initalize database:", err)
return nil, err
}
// Load the prior persistence structures, and configure the host to save
// before shutting down.
err = h.load()
if err != nil {
return nil, err
}
h.tg.AfterStop(func() {
err = h.saveSync()
if err != nil {
h.log.Println("Could not save host upon shutdown:", err)
}
})
// Initialize the networking.
err = h.initNetworking(listenerAddress)
if err != nil {
h.log.Println("Could not initialize host networking:", err)
return nil, err
}
return h, nil
}
// newHost returns an initialized Host, taking a set of dependencies as input.
// By making the dependencies an argument of the 'new' call, the host can be
// mocked such that the dependencies can return unexpected errors or unique
// behaviors during testing, enabling easier testing of the failure modes of
// the Host.
func newHost(dependencies dependencies, cs modules.ConsensusSet, tpool modules.TransactionPool, wallet modules.Wallet, listenerAddress string, persistDir string) (*Host, error) {
// Check that all the dependencies were provided.
if cs == nil {
return nil, errNilCS
}
if tpool == nil {
return nil, errNilTpool
}
if wallet == nil {
return nil, errNilWallet
}
// Create the host object.
h := &Host{
cs: cs,
tpool: tpool,
wallet: wallet,
dependencies: dependencies,
lockedStorageObligations: make(map[types.FileContractID]struct{}),
persistDir: persistDir,
}
// Call stop in the event of a partial startup.
var err error
defer func() {
if err != nil {
err = composeErrors(h.tg.Stop(), err)
}
}()
// Add the storage manager to the host.
h.StorageManager, err = storagemanager.New(filepath.Join(persistDir, "storagemanager"))
if err != nil {
return nil, err
}
// Create the perist directory if it does not yet exist.
err = dependencies.mkdirAll(h.persistDir, 0700)
if err != nil {
return nil, err
}
// Initialize the logger. Logging should be initialized ASAP, because the
// rest of the initialization makes use of the logger.
h.log, err = dependencies.newLogger(filepath.Join(h.persistDir, logFile))
if err != nil {
return nil, err
}
// Open the database containing the host's storage obligation metadata.
h.db, err = dependencies.openDatabase(dbMetadata, filepath.Join(h.persistDir, dbFilename))
if err != nil {
// An error will be returned if the database has the wrong version, but
// as of writing there was only one version of the database and all
// other databases would be incompatible.
_ = h.log.Close()
return nil, err
}
// After opening the database, it must be initialized. Most commonly,
// nothing happens. But for new databases, a set of buckets must be
// created. Initialization is also a good time to run sanity checks.
err = h.initDB()
if err != nil {
_ = h.log.Close()
_ = h.db.Close()
return nil, err
}
// Load the prior persistence structures.
err = h.load()
if err != nil {
_ = h.log.Close()
_ = h.db.Close()
return nil, err
}
// Get the host established on the network.
err = h.initNetworking(listenerAddress)
if err != nil {
_ = h.log.Close()
_ = h.db.Close()
return nil, err
}
return h, nil
}