/
inmem_object_store.go
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/
inmem_object_store.go
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/*
* Copyright 2017-2018 IBM Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package storage
import (
"archive/zip"
"fmt"
"io"
"strings"
"sync"
"strconv"
log "github.com/sirupsen/logrus"
)
const (
// DataStoreTypeInMemory is the name that represents an in-memory data store
DataStoreTypeInMemory = "inmem_datastore"
)
var (
// store needs to be global as we different instances to access the same data
store map[string]map[string][]byte
createOnce sync.Once
)
type inMemObjectStore struct {
}
// NewInMemObjectStore implements an in-memor object store for testing.
func NewInMemObjectStore(conf map[string]string) (DataStore, error) {
createOnce.Do(func() {
store = make(map[string]map[string][]byte)
})
return &inMemObjectStore{}, nil
}
func (o *inMemObjectStore) Connect() error {
// nothing to do
return nil
}
func (o *inMemObjectStore) UploadArchive(container string, object string, payload []byte) error {
log.Infof("(fake) UploadArchive: container '%s', object '%s'", container, object)
if store[container] == nil {
store[container] = make(map[string][]byte)
}
store[container][object] = payload
return nil
}
func (o *inMemObjectStore) DownloadArchive(container string, object string) ([]byte, error) {
if store[container] != nil {
return store[container][object], nil
}
return nil, fmt.Errorf("container or object '%s/%s' not found", container, object)
}
func (o *inMemObjectStore) DeleteArchive(container string, object string) error {
if store[container] != nil {
delete(store[container], object)
// delete container if last item
if len(store[container]) == 0 {
delete(store, container)
}
}
return nil
}
func (o *inMemObjectStore) GetTrainedModelSize(path string, numLearners int32) (int64, error) {
// separate path in container and object
var container, objectPrefix string
index := strings.Index(path, "/")
if index < 0 {
container = path
} else {
container = path[0:index]
objectPrefix = path[index+1:]
}
var trainedModelSize int64
// find the objects with objectPrefix
objects := make(map[string][]byte)
for k, v := range store[container] {
if strings.HasPrefix(k, objectPrefix) {
objects[k] = v
size, err := strconv.Atoi(string(v))
if err != nil {
return 0, err
}
trainedModelSize += int64(size)
}
}
return trainedModelSize, nil
}
func (o *inMemObjectStore) DownloadTrainedModelAsZipStream(path string, numLearners int32, writer io.Writer) error {
// separate path in container and object
var container, objectPrefix string
index := strings.Index(path, "/")
if index < 0 {
container = path
} else {
container = path[0:index]
objectPrefix = path[index+1:]
}
// find the objects with objectPrefix
objects := make(map[string][]byte)
for k, v := range store[container] {
if strings.HasPrefix(k, objectPrefix) {
objects[k] = v
}
}
log.Debugf("Trained model object names: %v", objects)
w := zip.NewWriter(writer)
for k, v := range objects {
f, err := w.Create(k)
if err != nil {
return err
}
_, err = f.Write(v)
if err != nil {
return err
}
}
err := w.Close()
return err
}
func (o *inMemObjectStore) DownloadTrainedModelLogFile(path string, numLearners int32, learnerIndex int32, objectPath string, writer io.Writer) error {
// separate path in container and object
log.Debugf("inMemObjectStore DownloadTrainedModelLogFile: bucket: %s, key: %s", path, objectPath)
var container, objectPrefix string
index := strings.Index(path, "/")
if index < 0 {
container = path
} else {
container = path[0:index]
objectPrefix = path[index+1:]
}
// find the objects with objectPrefix
objects := make(map[string][]byte)
for k, v := range store[container] {
if strings.HasPrefix(k, objectPrefix) {
objects[k] = v
}
}
log.Debugf("Trained model object names: %v", objects)
fullObjectPath := objectPrefix + "/" + objectPath
foundit := false
for k, v := range objects {
if fullObjectPath == k {
_, err := writer.Write(v)
if err != nil {
return err
}
foundit = true
break
}
}
if foundit == false {
return fmt.Errorf("DownloadTrainedModelLogFile: Could not find object: %s", fullObjectPath)
}
return nil
}
func (o *inMemObjectStore) ContainerExists(name string) (bool, error) {
if _, ok := store[name]; ok {
return true, nil
}
return false, nil
}
func (o *inMemObjectStore) Disconnect() {
// nothing to do
}