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main.go
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main.go
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package skyhdd
import (
"fmt"
"golang.org/x/net/context"
"google.golang.org/appengine"
"google.golang.org/appengine/log"
"google.golang.org/cloud/storage"
"io"
"net/http"
)
func init() {
http.HandleFunc("/", handler)
}
const gcsBucket = "learning-1130.appspot.com"
type demo struct {
ctx context.Context
res http.ResponseWriter
bucket *storage.BucketHandle
client *storage.Client
}
func handler(res http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/" {
http.NotFound(res, req)
return
}
ctx := appengine.NewContext(req)
client, err := storage.NewClient(ctx)
if err != nil {
log.Errorf(ctx, "ERROR handler NewClient: ", err)
return
}
defer client.Close()
d := &demo{
ctx: ctx,
res: res,
client: client,
bucket: client.Bucket(gcsBucket),
}
d.delFiles()
d.createFiles()
d.listFiles()
io.WriteString(d.res, "\nFILE NAMES WITH PREFIX QUERY ( Prefix: folder1/folder2/ )\n")
d.listDelim()
}
func (d *demo) listDelim() {
// this will only give us files that have this prefix
query := &storage.Query{
Prefix: "folder1/folder2/",
}
objs, err := d.bucket.List(d.ctx, query)
if err != nil {
log.Errorf(d.ctx, "listBucketDirMode: unable to list bucket %q: %v", gcsBucket, err)
return
}
for _, obj := range objs.Results {
fmt.Fprintf(d.res, "%v\n", obj.Name)
}
fmt.Fprintf(d.res, "\nPREFIXES ( storage.ObjectList Prefixes )\n%v", objs.Prefixes)
}
func (d *demo) listFiles() {
io.WriteString(d.res, "ALL FILE NAMES\n")
objs, err := d.bucket.List(d.ctx, nil)
if err != nil {
log.Errorf(d.ctx, "%v", err)
return
}
for _, obj := range objs.Results {
io.WriteString(d.res, obj.Name+"\n")
}
}
func (d *demo) createFiles() {
for _, n := range []string{"firstobject", "folder1/folder2/secondobject"} {
d.createFile(n)
}
}
func (d *demo) createFile(fileName string) {
wc := d.bucket.Object(fileName).NewWriter(d.ctx)
wc.ContentType = "text/plain"
if _, err := wc.Write([]byte("abcde\n")); err != nil {
log.Errorf(d.ctx, "createFile: unable to write data to bucket %q, file %q: %v", gcsBucket, fileName, err)
return
}
if err := wc.Close(); err != nil {
log.Errorf(d.ctx, "createFile: unable to close bucket %q, file %q: %v", gcsBucket, fileName, err)
return
}
}
func (d *demo) delFiles() {
objs, err := d.bucket.List(d.ctx, nil)
if err != nil {
log.Errorf(d.ctx, "%v", err)
return
}
for _, obj := range objs.Results {
if err := d.bucket.Object(obj.Name).Delete(d.ctx); err != nil {
log.Errorf(d.ctx, "deleteFiles: unable to delete bucket %q, file %q: %v", d.bucket, obj.Name, err)
return
}
}
}