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/
box.go
236 lines (207 loc) · 5.28 KB
/
box.go
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package packr
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
"sync"
"github.com/gobuffalo/envy"
"github.com/gobuffalo/packd"
"github.com/gobuffalo/packr/v2/file"
"github.com/gobuffalo/packr/v2/file/resolver"
"github.com/gobuffalo/packr/v2/plog"
"github.com/markbates/oncer"
"github.com/pkg/errors"
)
var _ packd.Box = &Box{}
var _ packd.HTTPBox = Box{}
var _ packd.Addable = &Box{}
var _ packd.Walkable = &Box{}
var _ packd.Finder = Box{}
// NewBox returns a Box that can be used to
// retrieve files from either disk or the embedded
// binary.
func NewBox(path string) *Box {
oncer.Deprecate(0, "packr.NewBox", "Use packr.New instead.")
return New(path, path)
}
func resolutionDir(og string) string {
ng, _ := filepath.Abs(og)
exists := func(s string) bool {
_, err := os.Stat(s)
if err != nil {
return false
}
plog.Debug("packr", "resolutionDir", "original", og, "resolved", s)
return true
}
if exists(ng) {
return ng
}
_, filename, _, _ := runtime.Caller(2)
ng = filepath.Join(filepath.Dir(filename), og)
// // this little hack courtesy of the `-cover` flag!!
cov := filepath.Join("_test", "_obj_test")
ng = strings.Replace(ng, string(filepath.Separator)+cov, "", 1)
if exists(ng) {
return ng
}
ng = filepath.Join(envy.GoPath(), "src", ng)
if exists(ng) {
return ng
}
return og
}
func construct(name string, path string) *Box {
return &Box{
Path: path,
Name: name,
ResolutionDir: resolutionDir(path),
resolvers: map[string]resolver.Resolver{},
moot: &sync.RWMutex{},
}
}
func New(name string, path string) *Box {
plog.Debug("packr", "New", "name", name, "path", path)
b, _ := findBox(name)
if b != nil {
return b
}
b = construct(name, path)
plog.Debug(b, "New", "Box", b, "ResolutionDir", b.ResolutionDir)
b, err := placeBox(b)
if err != nil {
panic(err)
}
return b
}
// Box represent a folder on a disk you want to
// have access to in the built Go binary.
type Box struct {
Path string `json:"path"`
Name string `json:"name"`
ResolutionDir string `json:"resolution_dir"`
DefaultResolver resolver.Resolver `json:"default_resolver"`
resolvers map[string]resolver.Resolver
moot *sync.RWMutex
}
func (b *Box) SetResolver(file string, res resolver.Resolver) {
b.moot.Lock()
plog.Debug(b, "SetResolver", "file", file, "resolver", fmt.Sprintf("%T", res))
b.resolvers[resolver.Key(file)] = res
b.moot.Unlock()
}
// AddString converts t to a byteslice and delegates to AddBytes to add to b.data
func (b *Box) AddString(path string, t string) error {
return b.AddBytes(path, []byte(t))
}
// AddBytes sets t in b.data by the given path
func (b *Box) AddBytes(path string, t []byte) error {
m := map[string]file.File{}
f, err := file.NewFile(path, t)
if err != nil {
return errors.WithStack(err)
}
m[resolver.Key(path)] = f
res := resolver.NewInMemory(m)
b.SetResolver(path, res)
return nil
}
// FindString returns either the string of the requested
// file or an error if it can not be found.
func (b Box) FindString(name string) (string, error) {
bb, err := b.Find(name)
return string(bb), err
}
// Find returns either the byte slice of the requested
// file or an error if it can not be found.
func (b Box) Find(name string) ([]byte, error) {
f, err := b.Resolve(name)
if err != nil {
return []byte(""), err
}
bb := &bytes.Buffer{}
io.Copy(bb, f)
return bb.Bytes(), nil
}
// Has returns true if the resource exists in the box
func (b Box) Has(name string) bool {
_, err := b.Find(name)
if err != nil {
return false
}
return true
}
// Open returns a File using the http.File interface
func (b Box) Open(name string) (http.File, error) {
plog.Debug(b, "Open", "name", name)
if len(filepath.Ext(name)) == 0 {
d, err := file.NewDir(name)
plog.Debug(b, "Open", "name", name, "dir", d)
return d, err
}
f, err := b.Resolve(name)
if err != nil {
return f, err
}
f, err = file.NewFileR(name, f)
plog.Debug(b, "Open", "name", f.Name(), "file", f.Name())
return f, err
}
// List shows "What's in the box?"
func (b Box) List() []string {
var keys []string
b.Walk(func(path string, info File) error {
if info == nil {
return nil
}
finfo, _ := info.FileInfo()
if !finfo.IsDir() {
keys = append(keys, path)
}
return nil
})
sort.Strings(keys)
return keys
}
func (b *Box) Resolve(key string) (file.File, error) {
key = strings.TrimPrefix(key, "/")
b.moot.RLock()
r, ok := b.resolvers[resolver.Key(key)]
b.moot.RUnlock()
if !ok {
r = b.DefaultResolver
if r == nil {
r = resolver.DefaultResolver
if r == nil {
return nil, errors.New("resolver.DefaultResolver is nil")
}
}
}
plog.Debug(r, "Resolve", "box", b.Name, "key", key)
f, err := r.Resolve(b.Name, key)
if err != nil {
z := filepath.Join(resolver.OsPath(b.ResolutionDir), resolver.OsPath(key))
f, err = r.Resolve(b.Name, z)
if err != nil {
plog.Debug(r, "Resolve", "box", b.Name, "key", z, "err", err)
return f, err
}
b, err := ioutil.ReadAll(f)
if err != nil {
return f, errors.WithStack(err)
}
f, err = file.NewFile(key, b)
if err != nil {
return f, errors.WithStack(err)
}
}
plog.Debug(r, "Resolve", "box", b.Name, "key", key, "file", f.Name())
return f, nil
}