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file_delete.go
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file_delete.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* 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 file
import (
"context"
"crypto/md5"
"encoding/hex"
"fmt"
"github.com/chaosblade-io/chaosblade-exec-os/exec"
"github.com/chaosblade-io/chaosblade-spec-go/log"
"github.com/chaosblade-io/chaosblade-spec-go/spec"
"path"
"github.com/chaosblade-io/chaosblade-exec-os/exec/category"
)
const DeleteFileBin = "chaos_deletefile"
type FileDeleteActionSpec struct {
spec.BaseExpActionCommandSpec
}
func NewFileDeleteActionSpec() spec.ExpActionCommandSpec {
return &FileDeleteActionSpec{
spec.BaseExpActionCommandSpec{
ActionMatchers: fileCommFlags,
ActionFlags: []spec.ExpFlagSpec{
&spec.ExpFlag{
Name: "force",
Desc: "use --force flag can't be restored",
NoArgs: true,
},
},
ActionExecutor: &FileRemoveActionExecutor{},
ActionExample: `
# Delete the file /home/logs/nginx.log
blade create file delete --filepath /home/logs/nginx.log
# Force delete the file /home/logs/nginx.log unrecoverable
blade create file delete --filepath /home/logs/nginx.log --force
`,
ActionPrograms: []string{DeleteFileBin},
ActionCategories: []string{category.SystemFile},
},
}
}
func (*FileDeleteActionSpec) Name() string {
return "delete"
}
func (*FileDeleteActionSpec) Aliases() []string {
return []string{}
}
func (*FileDeleteActionSpec) ShortDesc() string {
return "File delete"
}
func (f *FileDeleteActionSpec) LongDesc() string {
return "File delete"
}
type FileRemoveActionExecutor struct {
channel spec.Channel
}
func (*FileRemoveActionExecutor) Name() string {
return "remove"
}
func (f *FileRemoveActionExecutor) Exec(uid string, ctx context.Context, model *spec.ExpModel) *spec.Response {
commands := []string{"rm", "mv"}
if response, ok := f.channel.IsAllCommandsAvailable(ctx, commands); !ok {
return response
}
filepath := model.ActionFlags["filepath"]
force := model.ActionFlags["force"] == "true"
if _, ok := spec.IsDestroy(ctx); ok {
return f.stop(filepath, force, ctx)
}
if !exec.CheckFilepathExists(ctx, f.channel, filepath) {
log.Errorf(ctx,"`%s`: file does not exist", filepath)
return spec.ResponseFailWithFlags(spec.ParameterInvalid, "filepath", filepath, "the file does not exist")
}
return f.start(filepath, force, ctx)
}
func md5Hex(s string) string {
m := md5.New()
m.Write([]byte(s))
return hex.EncodeToString(m.Sum(nil))
}
func (f *FileRemoveActionExecutor) start(filepath string, force bool, ctx context.Context) *spec.Response {
if force {
return f.channel.Run(ctx, "rm", fmt.Sprintf(`-rf "%s"`, filepath))
} else {
target := path.Join(path.Dir(filepath), "."+md5Hex(path.Base(filepath)))
return f.channel.Run(ctx, "mv", fmt.Sprintf(`"%s" "%s"`, filepath, target))
}
}
func (f *FileRemoveActionExecutor) stop(filepath string, force bool, ctx context.Context) *spec.Response {
if force {
// nothing to do
return nil
} else {
target := path.Join(path.Dir(filepath), "."+md5Hex(path.Base(filepath)))
return f.channel.Run(ctx, "mv", fmt.Sprintf(`"%s" "%s"`, target, filepath))
}
}
func (f *FileRemoveActionExecutor) SetChannel(channel spec.Channel) {
f.channel = channel
}