Add everything back into one project hood, still missing iodine

pkg/storage/donut/donut.go

@@ -0,0 +1,87 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
+ *
+ * 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 donut
+
+import (
+	"errors"
+
+	"github.com/minio-io/iodine"
+)
+
+// donut struct internal data
+type donut struct {
+	name    string
+	buckets map[string]Bucket
+	nodes   map[string]Node
+}
+
+// config files used inside Donut
+const (
+	donutObjectMetadataConfig = "donutObjectMetadata.json"
+	objectMetadataConfig      = "objectMetadata.json"
+	donutConfig               = "donutMetadata.json"
+)
+
+// attachDonutNode - wrapper function to instantiate a new node for associated donut
+// based on the provided configuration
+func (d donut) attachDonutNode(hostname string, disks []string) error {
+	node, err := NewNode(hostname)
+	if err != nil {
+		return iodine.New(err, nil)
+	}
+	for i, disk := range disks {
+		// Order is necessary for maps, keep order number separately
+		newDisk, err := NewDisk(disk, i)
+		if err != nil {
+			return iodine.New(err, nil)
+		}
+		if err := newDisk.MakeDir(d.name); err != nil {
+			return iodine.New(err, nil)
+		}
+		if err := node.AttachDisk(newDisk); err != nil {
+			return iodine.New(err, nil)
+		}
+	}
+	if err := d.AttachNode(node); err != nil {
+		return iodine.New(err, nil)
+	}
+	return nil
+}
+
+// NewDonut - instantiate a new donut
+func NewDonut(donutName string, nodeDiskMap map[string][]string) (Donut, error) {
+	if donutName == "" || len(nodeDiskMap) == 0 {
+		return nil, iodine.New(errors.New("invalid argument"), nil)
+	}
+	nodes := make(map[string]Node)
+	buckets := make(map[string]Bucket)
+	d := donut{
+		name:    donutName,
+		nodes:   nodes,
+		buckets: buckets,
+	}
+	for k, v := range nodeDiskMap {
+		if len(v) == 0 {
+			return nil, iodine.New(errors.New("invalid number of disks per node"), nil)
+		}
+		err := d.attachDonutNode(k, v)
+		if err != nil {
+			return nil, iodine.New(err, nil)
+		}
+	}
+	return d, nil
+}