/
loader.go
104 lines (91 loc) · 2.33 KB
/
loader.go
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package model
import (
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
)
// Loader such as ssh, zip, tar, tgz
type Loader interface {
Name() string
Seperator() string
Support(FileItem) bool
Create(FileItem) (FileItem, error)
}
var (
loaders []Loader
loaderMap = make(map[string]Loader)
)
func init() {
fi, _ := os.Stat("/")
v := newFile("", fi)
root := &dir{v, &defaultDirOp{&defaultOp{v}}}
local := &localLoader{root}
registerLoader(local)
registerLoader(new(zipLoader))
registerLoader(new(tarLoader))
registerLoader(new(tgzLoader))
registerLoader(new(sshLoader))
}
// LoaderString return @xxx://
func LoaderString(loader Loader) string {
return fmt.Sprintf("@%s://", loader.Name())
}
type localLoader struct {
root FileItem
}
func (fp *localLoader) Name() string { return "file" }
func (fp *localLoader) Seperator() string { return string(filepath.Separator) }
func (fp *localLoader) Support(item FileItem) bool { return item.IsDir() }
func (fp *localLoader) Create(parent FileItem) (FileItem, error) { return fp.root, nil }
func registerLoader(loader Loader) {
loaderMap[loader.Name()] = loader
loaders = append([]Loader{loader}, loaders...)
}
// PathItem parse result
type PathItem struct {
Loader, Path, Seperator string
}
// ParsePath parse path
// /a/b/c.zip@zip:///hello/path
// /a/b/c.fff@ssh:///opt/c.tgz@tgz:///hello/path
func ParsePath(path string) []*PathItem {
p := "@file://" + path
tokens := regexp.MustCompile(`@(\w+)://`).FindAllStringSubmatchIndex(p, -1)
re := make([]*PathItem, 0)
for i, v := range tokens {
end := len(p)
if i < len(tokens)-1 {
end = tokens[i+1][0]
}
name, arg := p[v[2]:v[3]], p[v[1]:end]
re = append(re, &PathItem{name, arg, loaderMap[name].Seperator()})
}
return re
}
// Load file item from path
func Load(path string) (FileItem, error) {
var item FileItem
pis := ParsePath(path)
for _, p := range pis {
i, err := loaderMap[p.Loader].Create(item)
if err != nil {
return nil, err
}
item, err = i.(DirOp).To(p.Path)
if err != nil {
return nil, err
}
}
return item, nil
}
// LoadFile load a file as dir, such as .tar file
func LoadFile(item FileItem) (FileItem, error) {
for _, v := range loaders {
if v.Support(item) {
return v.Create(item)
}
}
return nil, errors.New("can not open file")
}