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dropbox: open the datastore in the background

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This commit is contained in:
Nick Craig-Wood 2014-07-12 12:38:30 +01:00
parent d2f187e1a1
commit e57a4c7c0c
1 changed files with 38 additions and 13 deletions
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51
dropbox/dropbox.go
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@ -100,6 +100,7 @@ type FsDropbox struct {
datastore *dropbox.Datastore
table *dropbox.Table
datastoreMutex sync.Mutex // lock this when using the datastore
datastoreErr error // pending errors on the datastore
}
// FsObjectDropbox describes a dropbox object
@ -171,17 +172,28 @@ func NewFs(name, path string) (fs.Fs, error) {
// Make a db to store rclone metadata in
f.datastoreManager = db.NewDatastoreManager()
// Open the rclone datastore
f.datastore, err = f.datastoreManager.OpenDatastore(datastoreName)
if err != nil {
return nil, err
}
// Open the datastore in the background
go func() {
f.datastoreMutex.Lock()
defer f.datastoreMutex.Unlock()
fs.Debug(f, "Open rclone datastore")
// Open the rclone datastore
f.datastore, err = f.datastoreManager.OpenDatastore(datastoreName)
if err != nil {
fs.Log(f, "Failed to open datastore: %v", err)
f.datastoreErr = err
return
}
// Get the table we are using
f.table, err = f.datastore.GetTable(tableName)
if err != nil {
return nil, err
}
// Get the table we are using
f.table, err = f.datastore.GetTable(tableName)
if err != nil {
fs.Log(f, "Failed to open datastore table: %v", err)
f.datastoreErr = err
return
}
fs.Debug(f, "Open rclone datastore finished")
}()
return f, nil
}
@ -368,6 +380,9 @@ func (f *FsDropbox) Purge() error {
func (f *FsDropbox) transaction(fn func() error) error {
f.datastoreMutex.Lock()
defer f.datastoreMutex.Unlock()
if f.datastoreErr != nil {
return f.datastoreErr
}
var err error
for i := 1; i <= maxCommitRetries; i++ {
err = fn()
@ -387,6 +402,18 @@ func (f *FsDropbox) transaction(fn func() error) error {
return nil
}
// Reads the record attached to key
//
// Holds datastore mutex while in progress
func (f *FsDropbox) readRecord(key string) (*dropbox.Record, error) {
f.datastoreMutex.Lock()
defer f.datastoreMutex.Unlock()
if f.datastoreErr != nil {
return nil, f.datastoreErr
}
return f.table.Get(key)
}
// ------------------------------------------------------------
// Return the parent Fs
@ -493,9 +520,7 @@ func (o *FsObjectDropbox) readMetaData() (err error) {
}
// fs.Debug(o, "Reading metadata from datastore")
o.dropbox.datastoreMutex.Lock()
record, err := o.dropbox.table.Get(o.metadataKey())
o.dropbox.datastoreMutex.Unlock()
record, err := o.dropbox.readRecord(o.metadataKey())
if err != nil {
fs.Debug(o, "Couldn't read metadata: %s", err)
record = nil