Golang blob.RefFromString函數代碼示例

func fakePhotosetsList(sets int) string {
	var photosets []*photosetInfo
	for i := 1; i <= sets; i++ {
		title := fmt.Sprintf("Photoset %d", i)
		photosetId := blob.RefFromString(title).DigestPrefix(10)
		primaryPhotoId := blob.RefFromString(fmt.Sprintf("Photo 1 on page 1 of photoset %s", photosetId)).DigestPrefix(10)
		item := &photosetInfo{
			Id:             photosetId,
			PrimaryPhotoId: primaryPhotoId,
			Title:          contentString{Content: title},
			Description:    contentString{Content: "fakePhotosetDescription"},
		}
		photosets = append(photosets, item)
	}

	setslist := struct {
		Photosets photosetList
	}{
		Photosets: photosetList{
			Photoset: photosets,
		},
	}

	list, err := json.MarshalIndent(&setslist, "", "	")
	if err != nil {
		log.Fatalf("%v", err)
	}
	return string(list)
}

// fakeCheckinsList returns a JSON checkins list of checkinsRequestLimit checkin
// items, starting at offset. It stops before checkinsRequestLimit if maxCheckin is
// reached. It uses towns to populate the venues. The returned list is saved in
// cached.
func fakeCheckinsList(offset, maxCheckin int, towns map[int]*venueLocationItem, cached map[int]string) string {
	if cl, ok := cached[offset]; ok {
		return cl
	}
	max := offset + checkinsRequestLimit
	if max > maxCheckin {
		max = maxCheckin
	}
	var items []*checkinItem
	tzCounter := 0
	venueCounter := 0
	for i := offset; i < max; i++ {
		shout := fmt.Sprintf("fakeShout %d", i)
		item := &checkinItem{
			Id:    blob.RefFromString(shout).DigestPrefix(10),
			Shout: shout,
			With: []*user{
				{
					Id:        "123",
					FirstName: "Kate",
					LastName:  "Pek",
					Photo: photoItem{
						Prefix: "https://irs3.4sqi.net/img/user/",
						Suffix: "/13674-S2IUMHALCCJJUTQO.jpg",
					},
				},
			},
			CreatedAt:      time.Now().Unix(),
			TimeZoneOffset: tzCounter * 60,
			Venue:          fakeVenue(venueCounter, towns),
		}
		items = append(items, item)
		tzCounter++
		venueCounter++
		if tzCounter == 24 {
			tzCounter = 0
		}
		if venueCounter == 5 {
			venueCounter = 0
		}
	}

	response := struct {
		Checkins struct {
			Items []*checkinItem
		}
	}{
		Checkins: struct {
			Items []*checkinItem
		}{
			Items: items,
		},
	}
	list, err := json.MarshalIndent(checkinsList{Response: response}, "", "	")
	if err != nil {
		log.Fatalf("%v", err)
	}
	cached[offset] = string(list)
	return cached[offset]
}

func fakePhotoEntry(photoNbr int, albumNbr int) picago.Entry {
	var content picago.EntryContent
	if photoNbr%2 == 0 {
		content = picago.EntryContent{
			URL:  "https://camlistore.org/pic/pudgy1.png",
			Type: "image/png",
		}
	}
	var point string
	if photoNbr%3 == 0 {
		point = "37.7447124 -122.4341914"
	} else {
		point = "45.1822842 5.7141854"
	}
	mediaContent := picago.MediaContent{
		URL:  "https://camlistore.org/pic/pudgy2.png",
		Type: "image/png",
	}
	media := &picago.Media{
		Title:       "fakePhotoTitle",
		Description: "fakePhotoDescription",
		Keywords:    "fakeKeyword1,fakeKeyword2",
		Content:     []picago.MediaContent{mediaContent},
	}
	// to be consistent, all the pics times should be anterior to their respective albums times. whatever.
	day := time.Hour * 24
	year := day * 365
	created := time.Now().Add(-time.Duration(photoNbr) * year)
	published := created.Add(day)
	updated := published.Add(day)

	exif := &picago.Exif{
		FStop:       7.7,
		Make:        "whatisthis?", // not obvious to me, needs doc in picago
		Model:       "potato",
		Exposure:    7.7,
		Flash:       false,
		FocalLength: 7.7,
		ISO:         100,
		Timestamp:   created.Unix(),
		UID:         "whatisthis?", // not obvious to me, needs doc in picago
	}

	title := fmt.Sprintf("Photo %d of album %d", photoNbr, albumNbr)
	return picago.Entry{
		ID:        blob.RefFromString(title).DigestPrefix(10),
		Exif:      exif,
		Summary:   "fakePhotoSummary",
		Title:     title,
		Location:  "fakePhotoLocation",
		Published: published,
		Updated:   updated,
		Media:     media,
		Point:     point,
		Content:   content,
	}
}

func fakePhotoItem() *photoItem {
	prefix := "https://camlistore.org/"
	suffix := "/pic/pudgy.png"
	return &photoItem{
		Id:     blob.RefFromString(prefix + suffix).DigestPrefix(10),
		Prefix: prefix,
		Suffix: suffix,
		Width:  704,
		Height: 186,
	}
}

// fakeCheckinsList returns a JSON checkins list of checkinsRequestLimit checkin
// items, starting at offset. It stops before checkinsRequestLimit if maxCheckin is
// reached. It uses towns to populate the venues. The returned list is saved in
// cached.
func fakeCheckinsList(offset, maxCheckin int, towns map[int]*venueLocationItem, cached map[int]string) string {
	if cl, ok := cached[offset]; ok {
		return cl
	}
	max := offset + checkinsRequestLimit
	if max > maxCheckin {
		max = maxCheckin
	}
	var items []*checkinItem
	tzCounter := 0
	venueCounter := 0
	for i := offset; i < max; i++ {
		shout := fmt.Sprintf("fakeShout %d", i)
		item := &checkinItem{
			Id:             blob.RefFromString(shout).DigestPrefix(10),
			Shout:          shout,
			CreatedAt:      time.Now().Unix(),
			TimeZoneOffset: tzCounter * 60,
			Venue:          fakeVenue(venueCounter, towns),
		}
		items = append(items, item)
		tzCounter++
		venueCounter++
		if tzCounter == 24 {
			tzCounter = 0
		}
		if venueCounter == 5 {
			venueCounter = 0
		}
	}

	response := struct {
		Checkins struct {
			Items []*checkinItem
		}
	}{
		Checkins: struct {
			Items []*checkinItem
		}{
			Items: items,
		},
	}
	list, err := json.MarshalIndent(checkinsList{Response: response}, "", "	")
	if err != nil {
		log.Fatalf("%v", err)
	}
	cached[offset] = string(list)
	return cached[offset]
}

func (im *imp) MakeTestData() http.RoundTripper {

	const (
		apiURL        = "https://picasaweb.google.com/data/feed/api"
		nAlbums       = 10 // Arbitrary number of albums generated.
		nEntries      = 3  // number of albums or photos returned in the feed at each call.
		defaultUserId = "default"
	)

	albumsListCached := make(map[int]string)
	okHeader := `HTTP/1.1 200 OK
Content-Type: application/json; charset=UTF-8

`

	responses := make(map[string]func() *http.Response)

	// register the get albums list calls
	for i := 1; i < nAlbums+1; i += nEntries {
		url := fmt.Sprintf("%s/user/%s?start-index=%d", apiURL, defaultUserId, i)
		response := okHeader + fakeAlbumsList(i, nAlbums, nEntries, albumsListCached)
		responses[url] = httputil.StaticResponder(response)
	}

	// register the get album calls
	for i := 1; i < nAlbums+1; i++ {
		albumId := blob.RefFromString(fmt.Sprintf("Album %d", i)).DigestPrefix(10)
		for j := 1; j < i+1; j += nEntries {
			url := fmt.Sprintf("%s/user/%s/albumid/%s?imgmax=d&start-index=%d", apiURL, defaultUserId, albumId, j)
			// Using i as nTotal argument means album N will have N photos in it.
			response := okHeader + fakePhotosList(j, i, nEntries)
			responses[url] = httputil.StaticResponder(response)
		}
	}

	// register the photo download calls
	pudgyPic := fakePhoto()
	photoURL1 := "https://camlistore.org/pic/pudgy1.png"
	photoURL2 := "https://camlistore.org/pic/pudgy2.png"
	responses[photoURL1] = httputil.FileResponder(pudgyPic)
	responses[photoURL2] = httputil.FileResponder(pudgyPic)

	return httputil.NewFakeTransport(responses)
}

func fakeVenue(counter int, towns map[int]*venueLocationItem) venueItem {
	prefix := "https://camlistore.org/"
	suffix := "/pic/pudgy.png"
	// TODO: add more.
	categories := []*venueCategory{
		{
			Primary: true,
			Name:    "town",
			Icon: &categoryIcon{
				Prefix: prefix,
				Suffix: suffix,
			},
		},
	}

	return venueItem{
		Id:         blob.RefFromString(towns[counter].City).DigestPrefix(10),
		Name:       towns[counter].City,
		Location:   towns[counter],
		Categories: categories,
	}
}

func fakeAlbum(counter int) picago.Entry {
	author := picago.Author{
		Name: "fakeAuthorName",
	}
	media := &picago.Media{
		Description: "fakeAlbumDescription",
		Keywords:    "fakeKeyword1,fakeKeyword2",
	}
	title := fmt.Sprintf("Album %d", counter)
	year := time.Hour * 24 * 365
	month := year / 12
	return picago.Entry{
		ID:        blob.RefFromString(title).DigestPrefix(10),
		Published: time.Now().Add(-time.Duration(counter) * year),
		Updated:   time.Now().Add(-time.Duration(counter) * month),
		Name:      "fakeAlbumName",
		Title:     title,
		Summary:   "fakeAlbumSummary",
		Location:  "fakeAlbumLocation",
		Author:    author,
		Media:     media,
	}
}

func (im *imp) MakeTestData() http.RoundTripper {

	const nCheckins = 150 // Arbitrary number of checkins generated.

	// if you add another venue, make sure the venueCounter reset
	// in fakeCheckinsList allows for that case to happen.
	// We could use global vars instead, but don't want to pollute the
	// fousquare pkg namespace.
	towns := map[int]*venueLocationItem{
		0: {
			Address:    "Baker street",
			City:       "Dublin",
			PostalCode: "0",
			State:      "none",
			Country:    "Ireland",
			Lat:        53.4053427,
			Lng:        -8.3320801,
		},
		1: {
			Address:    "Fish&Ships street",
			City:       "London",
			PostalCode: "1",
			State:      "none",
			Country:    "England",
			Lat:        55.3617609,
			Lng:        -3.4433238,
		},
		2: {
			Address:    "Haggis street",
			City:       "Glasgow",
			PostalCode: "2",
			State:      "none",
			Country:    "Scotland",
			Lat:        57.7394571,
			Lng:        -4.686997,
		},
		3: {
			Address:    "rue du croissant",
			City:       "Grenoble",
			PostalCode: "38000",
			State:      "none",
			Country:    "France",
			Lat:        45.1841655,
			Lng:        5.7155424,
		},
		4: {
			Address:    "burrito street",
			City:       "San Francisco",
			PostalCode: "94114",
			State:      "CA",
			Country:    "US",
			Lat:        37.7593625,
			Lng:        -122.4266995,
		},
	}

	// We need to compute the venueIds in advance, because the venue id is used as a parameter
	// in some of the requests we need to register.
	var venueIds []string
	for _, v := range towns {
		venueIds = append(venueIds, blob.RefFromString(v.City).DigestPrefix(10))
	}

	checkinsURL := apiURL + checkinsAPIPath
	checkinsListCached := make(map[int]string)
	okHeader := `HTTP/1.1 200 OK
Content-Type: application/json; charset=UTF-8

`

	responses := make(map[string]func() *http.Response)

	// register all the checkins calls; offset varies.
	for i := 0; i < nCheckins; i += checkinsRequestLimit {
		url := fmt.Sprintf("%s?limit=%d&oauth_token=fakeAccessToken&offset=%d&v=%s",
			checkinsURL, checkinsRequestLimit, i, apiVersion)
		response := okHeader + fakeCheckinsList(i, nCheckins, towns, checkinsListCached)
		responses[url] = httputil.StaticResponder(response)
	}

	// register all the venue photos calls (venueId varies)
	photosURL := apiURL + "venues"
	photosResponse := okHeader + fakePhotosList()
	for _, id := range venueIds {
		url := fmt.Sprintf("%s/%s/photos?limit=%d&oauth_token=fakeAccessToken&v=%s",
			photosURL, id, photosRequestLimit, apiVersion)
		responses[url] = httputil.StaticResponder(photosResponse)
	}

	// register the photoitem calls
	pudgyPic := fakePhoto()
	photoURL := "https://camlistore.org/pic/pudgy.png"
	originalPhotoURL := "https://camlistore.org/original/pic/pudgy.png"
	iconURL := "https://camlistore.org/bg_88/pic/pudgy.png"
	responses[photoURL] = httputil.FileResponder(pudgyPic)
	responses[originalPhotoURL] = httputil.FileResponder(pudgyPic)
	responses[iconURL] = httputil.FileResponder(pudgyPic)

	return httputil.NewFakeTransport(responses)
}

func (im imp) MakeTestData() http.RoundTripper {
	const (
		nPhotosets = 5 // Arbitrary number of sets.
		perPage    = 3 // number of photos per page (both when getting sets and when getting photos).
		fakeUserId = "fakeUserId"
	)
	// Photoset N has N photos, so we've got 15 ( = 5 + 4 + 3 + 2 + 1) photos in total.
	var nPhotos int
	for i := 1; i <= nPhotosets; i++ {
		nPhotos += i
	}
	nPhotosPages := nPhotos / perPage
	if nPhotos%perPage != 0 {
		nPhotosPages++
	}

	okHeader := `HTTP/1.1 200 OK
Content-Type: application/json; charset=UTF-8

`

	// TODO(mpl): this scheme does not take into account that we could have the same photo
	// in different albums. These two photos will end up with a different photoId.
	buildPhotoIds := func(nsets, perPage int) []string {
		var ids []string
		for i := 1; i <= nsets; i++ {
			photosetId := blob.RefFromString(fmt.Sprintf("Photoset %d", i)).DigestPrefix(10)
			page := 1
			// Photoset N has N photos.
			indexOnPage := 1
			for j := 1; j <= i; j++ {
				photoId := blob.RefFromString(fmt.Sprintf("Photo %d on page %d of photoset %s", indexOnPage, page, photosetId)).DigestPrefix(10)
				ids = append(ids, photoId)
				indexOnPage++
				if indexOnPage > perPage {
					page++
					indexOnPage = 1
				}
			}
		}
		return ids
	}
	photoIds := buildPhotoIds(nPhotosets, perPage)

	responses := make(map[string]func() *http.Response)
	// Initial photo sets list
	photosetsURL := fmt.Sprintf("%s?format=json&method=%s&nojsoncallback=1&user_id=%s", apiURL, photosetsAPIPath, fakeUserId)
	response := fmt.Sprintf("%s%s", okHeader, fakePhotosetsList(nPhotosets))
	responses[photosetsURL] = httputil.StaticResponder(response)

	// All the photoset calls. One call for each page of each photoset.
	// Each page as perPage photos, or maybe less if end of the photoset.
	{
		pageStart := 0
		albumEnd, pageEnd, albumNum, pages, page := 1, 1, 1, 1, 1
		photosetId := blob.RefFromString(fmt.Sprintf("Photoset %d", albumNum)).DigestPrefix(10)
		photosURL := fmt.Sprintf("%s?extras=original_format&format=json&method=%s&nojsoncallback=1&page=%d&photoset_id=%s&user_id=%s",
			apiURL, photosetAPIPath, page, photosetId, fakeUserId)
		response := fmt.Sprintf("%s%s", okHeader, fakePhotoset(photosetId, page, pages, photoIds[pageStart:pageEnd]))
		responses[photosURL] = httputil.StaticResponder(response)
		for k, _ := range photoIds {
			if k < pageEnd {
				continue
			}
			page++
			pageStart = k
			pageEnd = k + perPage
			if page > pages {
				albumNum++
				page = 1
				pages = albumNum / perPage
				if albumNum%perPage != 0 {
					pages++
				}
				albumEnd = pageStart + albumNum
				photosetId = blob.RefFromString(fmt.Sprintf("Photoset %d", albumNum)).DigestPrefix(10)
			}
			if pageEnd > albumEnd {
				pageEnd = albumEnd
			}
			photosURL := fmt.Sprintf("%s?extras=original_format&format=json&method=%s&nojsoncallback=1&page=%d&photoset_id=%s&user_id=%s",
				apiURL, photosetAPIPath, page, photosetId, fakeUserId)
			response := fmt.Sprintf("%s%s", okHeader, fakePhotoset(photosetId, page, pages, photoIds[pageStart:pageEnd]))
			responses[photosURL] = httputil.StaticResponder(response)
		}
	}

	// All the photo page calls (to get the photos info).
	// Each page has perPage photos, until end of photos.
	for i := 1; i <= nPhotosPages; i++ {
		photosURL := fmt.Sprintf("%s?extras=", apiURL) +
			url.QueryEscape("description,date_upload,date_taken,original_format,last_update,geo,tags,machine_tags,views,media,url_o") +
			fmt.Sprintf("&format=json&method=%s&nojsoncallback=1&page=%d&user_id=%s", photosAPIPath, i, fakeUserId)
		response := fmt.Sprintf("%s%s", okHeader, fakePhotosPage(i, nPhotosPages, perPage, photoIds))
		responses[photosURL] = httputil.StaticResponder(response)
	}

	// Actual photo(s) URL.
	pudgyPic := fakePicture()
	for _, v := range photoIds {
//.........這裏部分代碼省略.........

// IsDir reports whether root is a localdisk (file-per-blob) storage directory.
func IsDir(root string) (bool, error) {
	if osutil.DirExists(filepath.Join(root, blob.RefFromString("").HashName())) {
		return true, nil
	}
	return false, nil
}

// ReceiveString uploads the blob given by the string s to dst
// and returns its blobref and size.
func ReceiveString(dst BlobReceiver, s string) (blob.SizedRef, error) {
	return Receive(dst, blob.RefFromString(s), strings.NewReader(s))
}