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|
package storage
import (
"fmt"
"github.com/viant/toolbox"
"io"
"io/ioutil"
"os"
"path"
"strings"
)
type StorageMapping struct {
SourceURL string
SourceCredential string
DestinationURI string
TargetFile string
TargetPackage string
UseTextFormat bool
}
var binaryFormats = map[string]bool{
".png": true,
".jpeg": true,
".ico": true,
".jpg": true,
}
//GenerateStorageCode create a *.go files with statically scanned content from source URL.
func GenerateStorageCode(mappings ...*StorageMapping) error {
destinationService := NewMemoryService()
for _, mapping := range mappings {
sourceService, err := NewServiceForURL(mapping.SourceURL, mapping.SourceCredential)
if err != nil {
return err
}
handler, writer, err := NewStorageMapperHandler(mapping.TargetFile, mapping.TargetPackage, mapping.UseTextFormat, binaryFormats)
if err != nil {
return err
}
defer writer.Close()
destinationURL := "mem://" + mapping.DestinationURI
err = copyStorageContent(sourceService, mapping.SourceURL, destinationService, destinationURL, nil, "", handler)
if err != nil {
return err
}
}
return nil
}
//NewStorageMapperHandler creates a template handler for generating go file that write static content into memory service.
func NewStorageMapperHandler(filename, pkg string, useTextFormat bool, binaryFormat map[string]bool) (CopyHandler, io.WriteCloser, error) {
_ = toolbox.RemoveFileIfExist(filename)
writer, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return nil, nil, err
}
template := &templateWriter{writer}
_ = template.Init(pkg)
return func(sourceObject Object, source io.Reader, destinationService Service, destinationURL string) error {
_, name := toolbox.URLSplit(destinationURL)
if strings.HasPrefix(name, ".") {
//skip hidden files
return nil
}
content, err := ioutil.ReadAll(source)
if err != nil {
return err
}
isText := useTextFormat
ext := path.Ext(destinationURL)
if binaryFormat[ext] {
isText = false
}
template.WriteStorageContent(destinationURL, content, isText)
return nil
}, template, nil
}
type templateWriter struct {
io.WriteCloser
}
func (t *templateWriter) Init(pkg string) error {
var begin = `package %v
import (
"bytes"
"github.com/viant/toolbox/storage"
"log"
)
func init() {
var memStorage = storage.NewMemoryService();
`
_, err := t.Write([]byte(fmt.Sprintf(begin, pkg)))
return err
}
func (t *templateWriter) WriteStorageContent(URL string, content []byte, useText bool) error {
if useText {
text := string(content)
var count = strings.Count(text, "`")
if count > 0 {
text = strings.Replace(text, "`", "`+\"`\"+`", count)
content = []byte(text)
}
}
var contentReader = fmt.Sprintf("bytes.NewReader([]byte(`%s`))", content)
if !toolbox.IsASCIIText(contentReader) && !useText {
var byteArray = make([]string, 0)
for _, b := range content {
byteArray = append(byteArray, fmt.Sprintf("%d", b))
}
contentReader = fmt.Sprintf("bytes.NewReader([]byte{%v})", strings.Join(byteArray, ","))
}
var payload = ` {
err := memStorage.Upload("%v", %v)
if err != nil {
log.Printf("failed to upload: %v %v", err)
}
}
`
payload = fmt.Sprintf(payload, URL, contentReader, URL, "%v")
_, err := t.Write([]byte(payload))
return err
}
func (t *templateWriter) Close() error {
var end = "}\n"
_, err := t.Write([]byte(end))
t.WriteCloser.Close()
return err
}
|
