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package storage
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
import (
"encoding/xml"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"time"
)
// GetPageRangesResponse contains the response fields from
// Get Page Ranges call.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type GetPageRangesResponse struct {
XMLName xml.Name `xml:"PageList"`
PageList []PageRange `xml:"PageRange"`
}
// PageRange contains information about a page of a page blob from
// Get Pages Range call.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type PageRange struct {
Start int64 `xml:"Start"`
End int64 `xml:"End"`
}
var (
errBlobCopyAborted = errors.New("storage: blob copy is aborted")
errBlobCopyIDMismatch = errors.New("storage: blob copy id is a mismatch")
)
// PutPageOptions includes the options for a put page operation
type PutPageOptions struct {
Timeout uint
LeaseID string `header:"x-ms-lease-id"`
IfSequenceNumberLessThanOrEqualTo *int `header:"x-ms-if-sequence-number-le"`
IfSequenceNumberLessThan *int `header:"x-ms-if-sequence-number-lt"`
IfSequenceNumberEqualTo *int `header:"x-ms-if-sequence-number-eq"`
IfModifiedSince *time.Time `header:"If-Modified-Since"`
IfUnmodifiedSince *time.Time `header:"If-Unmodified-Since"`
IfMatch string `header:"If-Match"`
IfNoneMatch string `header:"If-None-Match"`
RequestID string `header:"x-ms-client-request-id"`
}
// WriteRange writes a range of pages to a page blob.
// Ranges must be aligned with 512-byte boundaries and chunk must be of size
// multiplies by 512.
//
// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Put-Page
func (b *Blob) WriteRange(blobRange BlobRange, bytes io.Reader, options *PutPageOptions) error {
if bytes == nil {
return errors.New("bytes cannot be nil")
}
return b.modifyRange(blobRange, bytes, options)
}
// ClearRange clears the given range in a page blob.
// Ranges must be aligned with 512-byte boundaries and chunk must be of size
// multiplies by 512.
//
// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Put-Page
func (b *Blob) ClearRange(blobRange BlobRange, options *PutPageOptions) error {
return b.modifyRange(blobRange, nil, options)
}
func (b *Blob) modifyRange(blobRange BlobRange, bytes io.Reader, options *PutPageOptions) error {
if blobRange.End < blobRange.Start {
return errors.New("the value for rangeEnd must be greater than or equal to rangeStart")
}
if blobRange.Start%512 != 0 {
return errors.New("the value for rangeStart must be a multiple of 512")
}
if blobRange.End%512 != 511 {
return errors.New("the value for rangeEnd must be a multiple of 512 - 1")
}
params := url.Values{"comp": {"page"}}
// default to clear
write := "clear"
var cl uint64
// if bytes is not nil then this is an update operation
if bytes != nil {
write = "update"
cl = (blobRange.End - blobRange.Start) + 1
}
headers := b.Container.bsc.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-page-write"] = write
headers["x-ms-range"] = blobRange.String()
headers["Content-Length"] = fmt.Sprintf("%v", cl)
if options != nil {
params = addTimeout(params, options.Timeout)
headers = mergeHeaders(headers, headersFromStruct(*options))
}
uri := b.Container.bsc.client.getEndpoint(blobServiceName, b.buildPath(), params)
resp, err := b.Container.bsc.client.exec(http.MethodPut, uri, headers, bytes, b.Container.bsc.auth)
if err != nil {
return err
}
defer drainRespBody(resp)
return checkRespCode(resp, []int{http.StatusCreated})
}
// GetPageRangesOptions includes the options for a get page ranges operation
type GetPageRangesOptions struct {
Timeout uint
Snapshot *time.Time
PreviousSnapshot *time.Time
Range *BlobRange
LeaseID string `header:"x-ms-lease-id"`
RequestID string `header:"x-ms-client-request-id"`
}
// GetPageRanges returns the list of valid page ranges for a page blob.
//
// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Get-Page-Ranges
func (b *Blob) GetPageRanges(options *GetPageRangesOptions) (GetPageRangesResponse, error) {
params := url.Values{"comp": {"pagelist"}}
headers := b.Container.bsc.client.getStandardHeaders()
if options != nil {
params = addTimeout(params, options.Timeout)
params = addSnapshot(params, options.Snapshot)
if options.PreviousSnapshot != nil {
params.Add("prevsnapshot", timeRFC3339Formatted(*options.PreviousSnapshot))
}
if options.Range != nil {
headers["Range"] = options.Range.String()
}
headers = mergeHeaders(headers, headersFromStruct(*options))
}
uri := b.Container.bsc.client.getEndpoint(blobServiceName, b.buildPath(), params)
var out GetPageRangesResponse
resp, err := b.Container.bsc.client.exec(http.MethodGet, uri, headers, nil, b.Container.bsc.auth)
if err != nil {
return out, err
}
defer drainRespBody(resp)
if err = checkRespCode(resp, []int{http.StatusOK}); err != nil {
return out, err
}
err = xmlUnmarshal(resp.Body, &out)
return out, err
}
// PutPageBlob initializes an empty page blob with specified name and maximum
// size in bytes (size must be aligned to a 512-byte boundary). A page blob must
// be created using this method before writing pages.
//
// See CreateBlockBlobFromReader for more info on creating blobs.
//
// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Put-Blob
func (b *Blob) PutPageBlob(options *PutBlobOptions) error {
if b.Properties.ContentLength%512 != 0 {
return errors.New("Content length must be aligned to a 512-byte boundary")
}
params := url.Values{}
headers := b.Container.bsc.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-blob-content-length"] = fmt.Sprintf("%v", b.Properties.ContentLength)
headers["x-ms-blob-sequence-number"] = fmt.Sprintf("%v", b.Properties.SequenceNumber)
headers = mergeHeaders(headers, headersFromStruct(b.Properties))
headers = b.Container.bsc.client.addMetadataToHeaders(headers, b.Metadata)
if options != nil {
params = addTimeout(params, options.Timeout)
headers = mergeHeaders(headers, headersFromStruct(*options))
}
uri := b.Container.bsc.client.getEndpoint(blobServiceName, b.buildPath(), params)
resp, err := b.Container.bsc.client.exec(http.MethodPut, uri, headers, nil, b.Container.bsc.auth)
if err != nil {
return err
}
return b.respondCreation(resp, BlobTypePage)
}
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