func (cf *Config) GetChainstore() (chainstore.Store, error) {
// chainstore.DefaultTimeout = 60 * time.Second // TODO: ....
// First, reset cache storage path
err := filepath.Walk(
cf.Chainstore.Path,
func(path string, info os.FileInfo, err error) error {
if cf.Chainstore.Path == path {
return nil // skip the root
}
if err = os.RemoveAll(path); err != nil {
return fmt.Errorf("Failed to remove or clean the directory: %s, because: %s", path, err)
}
return nil
},
)
if err != nil {
return nil, err
}
// Build the stores and setup the chain
memStore := metricsmgr.New("fn.store.mem",
memstore.New(cf.Chainstore.MemCacheSize*1024*1024),
)
diskStore := lrumgr.New(cf.Chainstore.DiskCacheSize*1024*1024,
metricsmgr.New("fn.store.bolt",
boltstore.New(cf.Chainstore.Path+"store.db", "imgry"),
),
)
var store chainstore.Store
if cf.Chainstore.S3AccessKey != "" && cf.Chainstore.S3SecretKey != "" {
s3Store := metricsmgr.New("fn.store.s3",
s3store.New(cf.Chainstore.S3Bucket, cf.Chainstore.S3AccessKey, cf.Chainstore.S3SecretKey),
)
// store = chainstore.New(memStore, chainstore.Async(diskStore, s3Store))
store = chainstore.New(memStore, chainstore.Async(nil, s3Store))
} else {
store = chainstore.New(memStore, chainstore.Async(nil, diskStore))
}
if err := store.Open(); err != nil {
return nil, err
}
return store, nil
}
func (cf *Config) GetChainstore() (chainstore.Store, error) {
// First, reset cache storage path
err := filepath.Walk(
cf.Chainstore.Path,
func(path string, info os.FileInfo, err error) error {
if cf.Chainstore.Path == path {
return nil // skip the root
}
if err = os.RemoveAll(path); err != nil {
return fmt.Errorf("Failed to remove or clean the directory: %s, because: %s", path, err)
}
return nil
},
)
if err != nil {
return nil, err
}
// TODO: impl another kind of lrumgr (or option) to be based on number of keys, not filesize
// at which point, we can add a method called .Keys() that will return the keys
// matching some query from a Store, and we can seed the LRU this way, and keep
// the bolt data..
// Build the stores and setup the chain
memStore := memstore.New(cf.Chainstore.MemCacheSize * 1024 * 1024)
diskStore := lrumgr.New(cf.Chainstore.DiskCacheSize*1024*1024,
metricsmgr.New("fn.store.bolt", nil,
levelstore.New(cf.Chainstore.Path),
),
)
var store chainstore.Store
if cf.Chainstore.S3AccessKey != "" && cf.Chainstore.S3SecretKey != "" {
s3Store := metricsmgr.New("fn.store.s3", nil,
s3store.New(cf.Chainstore.S3Bucket, cf.Chainstore.S3AccessKey, cf.Chainstore.S3SecretKey),
)
store = chainstore.New(memStore, chainstore.Async(diskStore, s3Store))
} else {
store = chainstore.New(memStore, chainstore.Async(diskStore))
}
if err := store.Open(); err != nil {
return nil, err
}
return store, nil
}
func main() {
diskStore := lrumgr.New(500*1024*1024, // 500MB of working data
metricsmgr.New("chainstore.ex.bolt", nil,
boltstore.New("/tmp/store.db", "myBucket"),
),
)
remoteStore := metricsmgr.New("chainstore.ex.s3", nil,
// NOTE: you'll have to supply your own keys in order for this example to work properly
s3store.New("myBucket", "access-key", "secret-key"),
)
dataStore := chainstore.New(diskStore, chainstore.Async(remoteStore))
// OR.. define inline. Except, I wanted to show store independence & state.
/*
dataStore := chainstore.New(
lrumgr.New(500*1024*1024, // 500MB of working data
metricsmgr.New("chainstore.ex.bolt", nil,
boltstore.New("/tmp/store.db", "myBucket"),
),
),
chainstore.Async( // calls stores in the async chain in a goroutine
metricsmgr.New("chainstore.ex.s3", nil,
// NOTE: you'll have to supply your own keys in order for this example to work properly
s3store.New("myBucket", "access-key", "secret-key"),
),
),
)
*/
err := dataStore.Open()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Since we've used the metricsManager above (metricsmgr), any calls to the boltstore
// and s3store will be measured. Next is to send metrics to librato, graphite, influxdb,
// whatever.. via github.com/rcrowley/go-metrics
// go librato.Librato(metrics.DefaultRegistry, 10e9, ...)
//--
// Save the object in the chain. It will be Put() synchronously into diskStore,
// the boltdb engine, and then immediately dispatch background Put()'s to the
// other stores down the chain, in this case S3.
fmt.Println("Example 1...")
obj := []byte{1, 2, 3}
dataStore.Put("k", obj)
fmt.Println("Put 'k':", obj, "in the chain")
v, _ := dataStore.Get("k")
fmt.Println("Grabbing 'k' from the chain:", v) // => [1 2 3]
// For demonstration, let's grab the key directly from the store instead of
// through the chain. This is pretty much the same as above, as the chain's Get()
// stops once it finds the object.
v, _ = diskStore.Get("k")
fmt.Println("Grabbing 'k' directly from boltdb:", v) // => [1 2 3]
// lets pause for a moment and then try to retrieve the value from the s3 store
time.Sleep(1e9)
// Grab the object from s3
v, _ = remoteStore.Get("k")
fmt.Println("Grabbing 'k' directly from s3:", v) // => [1 2 3]
// Delete the object from everywhere
dataStore.Del("k")
time.Sleep(1e9) // pause for s3 demo
v, _ = dataStore.Get("k")
fmt.Println("Deleted 'k' from the chain (all stores). Get(k) returns:", v)
//--
// Another interesting behavior of the chain is when doing a Get(), it goes down
// the entire chain looking for the value, and when found, it will Put() that
// object back up the chain for subsequent retrievals. Lets see..
fmt.Println("Example 2...")
obj = []byte("hope you enjoy")
dataStore.Put("hi", obj)
fmt.Println("Put 'hi':", obj, "in the chain")
time.Sleep(1e9) // lets wait for s3 again with more then enough time
diskStore.Del("hi")
v, _ = diskStore.Get("hi")
fmt.Println("Delete 'hi' from boltdb. diskStore.Get(k) returns:", v)
v, _ = dataStore.Get("hi")
fmt.Println("Let's ask the chain for 'hi':", v)
time.Sleep(1e9) // pause for bg routine to fill our local cache
// The diskStore now has the value again from remoteStore lower down the chain.
v, _ = diskStore.Get("hi")
fmt.Println("Now, let's ask our diskStore again! diskStore.Get(k) returns:", v)
// Also.. even though it hasn't been demonstrated here, the diskStore will only
// store a max of 500MB (as defined with diskLru) worth of objects. Give it a shot.
}