feat(zfs-localpv): initial commit

provisioning and deprovisioning of
the volumes on the node where zfs pool
has already been setup. Pool name and the volume
parameters has to be given in storage class
which will be used to provision the volume.

Signed-off-by: Pawan <pawan@mayadata.io>

pkg/builder/build.go

@@ -0,0 +1,208 @@
+/*
+Copyright 2019 The OpenEBS Authors
+
+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 builder
+
+import (
+	apis "github.com/openebs/zfs-localpv/pkg/apis/openebs.io/core/v1alpha1"
+	"github.com/openebs/zfs-localpv/pkg/common/errors"
+)
+
+// Builder is the builder object for ZFSVolume
+type Builder struct {
+	volume *ZFSVolume
+	errs   []error
+}
+
+// NewBuilder returns new instance of Builder
+func NewBuilder() *Builder {
+	return &Builder{
+		volume: &ZFSVolume{
+			Object: &apis.ZFSVolume{},
+		},
+	}
+}
+
+// BuildFrom returns new instance of Builder
+// from the provided api instance
+func BuildFrom(volume *apis.ZFSVolume) *Builder {
+	if volume == nil {
+		b := NewBuilder()
+		b.errs = append(
+			b.errs,
+			errors.New("failed to build volume object: nil volume"),
+		)
+		return b
+	}
+	return &Builder{
+		volume: &ZFSVolume{
+			Object: volume,
+		},
+	}
+}
+
+// WithNamespace sets the namespace of csi volume
+func (b *Builder) WithNamespace(namespace string) *Builder {
+	if namespace == "" {
+		b.errs = append(
+			b.errs,
+			errors.New(
+				"failed to build csi volume object: missing namespace",
+			),
+		)
+		return b
+	}
+	b.volume.Object.Namespace = namespace
+	return b
+}
+
+// WithName sets the name of csi volume
+func (b *Builder) WithName(name string) *Builder {
+	if name == "" {
+		b.errs = append(
+			b.errs,
+			errors.New(
+				"failed to build csi volume object: missing name",
+			),
+		)
+		return b
+	}
+	b.volume.Object.Name = name
+	return b
+}
+
+// WithCapacity sets the Capacity of csi volume by converting string
+// capacity into Quantity
+func (b *Builder) WithCapacity(capacity string) *Builder {
+	if capacity == "" {
+		b.errs = append(
+			b.errs,
+			errors.New(
+				"failed to build csi volume object: missing capacity",
+			),
+		)
+		return b
+	}
+	b.volume.Object.Spec.Capacity = capacity
+	return b
+}
+
+// WithCompression sets compression of CStorVolumeClaim
+func (b *Builder) WithCompression(compression string) *Builder {
+
+	comp := "off"
+	if compression == "on" {
+		comp = "on"
+	}
+	b.volume.Object.Spec.Compression = comp
+	return b
+}
+
+// WithDedup sets compression of CStorVolumeClaim
+func (b *Builder) WithDedup(dedup string) *Builder {
+
+	dp := "off"
+	if dedup == "on" {
+		dp = "on"
+	}
+	b.volume.Object.Spec.Dedup = dp
+	return b
+}
+
+// WithThinProv sets compression of CStorVolumeClaim
+func (b *Builder) WithThinProv(thinprov string) *Builder {
+
+	tp := "no"
+	if thinprov == "yes" {
+		tp = "yes"
+	}
+	b.volume.Object.Spec.ThinProvision = tp
+	return b
+}
+
+// WithBlockSize sets blocksize of CStorVolumeClaim
+func (b *Builder) WithBlockSize(blockSize string) *Builder {
+
+	bs := "4k"
+	if len(blockSize) > 0 {
+		bs = blockSize
+	}
+	b.volume.Object.Spec.BlockSize = bs
+	return b
+}
+
+func (b *Builder) WithPoolName(pool string) *Builder {
+	if pool == "" {
+		b.errs = append(
+			b.errs,
+			errors.New(
+				"failed to build csi volume object: missing pool name",
+			),
+		)
+		return b
+	}
+	b.volume.Object.Spec.PoolName = pool
+	return b
+}
+
+func (b *Builder) WithNodename(name string) *Builder {
+	if name == "" {
+		b.errs = append(
+			b.errs,
+			errors.New(
+				"failed to build csi volume object: missing node name",
+			),
+		)
+		return b
+	}
+	b.volume.Object.Spec.OwnerNodeID = name
+	return b
+}
+
+// WithLabels merges existing labels if any
+// with the ones that are provided here
+func (b *Builder) WithLabels(labels map[string]string) *Builder {
+	if len(labels) == 0 {
+		b.errs = append(
+			b.errs,
+			errors.New("failed to build cstorvolume object: missing labels"),
+		)
+		return b
+	}
+
+	if b.volume.Object.Labels == nil {
+		b.volume.Object.Labels = map[string]string{}
+	}
+
+	for key, value := range labels {
+		b.volume.Object.Labels[key] = value
+	}
+	return b
+}
+
+func (b *Builder) WithFinalizer(finalizer []string) *Builder {
+	b.volume.Object.Finalizers = append(b.volume.Object.Finalizers, finalizer...)
+	return b
+}
+
+// Build returns csi volume API object
+func (b *Builder) Build() (*apis.ZFSVolume, error) {
+	if len(b.errs) > 0 {
+		return nil, errors.Errorf("%+v", b.errs)
+	}
+
+	return b.volume.Object, nil
+}