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builder.go
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builder.go
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/*
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 pdetach
import (
"fmt"
"os/exec"
"reflect"
"runtime"
"strings"
"github.com/openebs/cstor-operators/pkg/zcmd/bin"
"github.com/pkg/errors"
)
const (
// Operation defines type of zfs operation
Operation = "detach"
)
//PoolDetach defines structure for pool 'Detach' operation
type PoolDetach struct {
//pool name
Pool string
// vdev name
Vdev string
// command string
Command string
// checks is list of predicate function used for validating object
checks []PredicateFunc
// error
err error
}
// NewPoolDetach returns new instance of object PoolDetach
func NewPoolDetach() *PoolDetach {
return &PoolDetach{}
}
// WithCheck add given check to checks list
func (p *PoolDetach) WithCheck(check ...PredicateFunc) *PoolDetach {
p.checks = append(p.checks, check...)
return p
}
// WithPool method fills the Pool field of PoolDetach object.
func (p *PoolDetach) WithPool(Pool string) *PoolDetach {
p.Pool = Pool
return p
}
// WithVdev method fills the Vdev field of PoolDetach object.
func (p *PoolDetach) WithVdev(Vdev string) *PoolDetach {
p.Vdev = Vdev
return p
}
// WithCommand method fills the Command field of PoolDetach object.
func (p *PoolDetach) WithCommand(Command string) *PoolDetach {
p.Command = Command
return p
}
// Validate is to validate generated PoolDetach object by builder
func (p *PoolDetach) Validate() *PoolDetach {
for _, check := range p.checks {
if !check(p) {
p.err = errors.Wrapf(p.err, "validation failed {%v}", runtime.FuncForPC(reflect.ValueOf(check).Pointer()).Name())
}
}
return p
}
// Execute is to execute generated PoolDetach object
func (p *PoolDetach) Execute() ([]byte, error) {
p, err := p.Build()
if err != nil {
return nil, err
}
// execute command here
// #nosec
return exec.Command(bin.BASH, "-c", p.Command).CombinedOutput()
}
// Build returns the PoolDetach object generated by builder
func (p *PoolDetach) Build() (*PoolDetach, error) {
var c strings.Builder
p = p.Validate()
p.appendCommand(&c, bin.ZPOOL)
p.appendCommand(&c, fmt.Sprintf(" %s ", Operation))
p.appendCommand(&c, fmt.Sprintf(" %s ", p.Pool))
p.appendCommand(&c, fmt.Sprintf(" %s ", p.Vdev))
p.Command = c.String()
return p, p.err
}
// appendCommand append string to given string builder
func (p *PoolDetach) appendCommand(c *strings.Builder, cmd string) {
_, err := c.WriteString(cmd)
if err != nil {
p.err = errors.Wrapf(p.err, "Failed to append cmd{%s} : %s", cmd, err.Error())
}
}