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package files
import (
"context"
"fmt"
"net/http"
"strings"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/azure"
"github.com/Azure/go-autorest/autorest/validation"
"github.com/tombuildsstuff/giovanni/storage/internal/endpoints"
)
type GetByteRangeInput struct {
StartBytes int64
EndBytes int64
}
type GetByteRangeResult struct {
autorest.Response
Contents []byte
}
// GetByteRange returns the specified Byte Range from the specified File.
func (client Client) GetByteRange(ctx context.Context, accountName, shareName, path, fileName string, input GetByteRangeInput) (result GetByteRangeResult, err error) {
if accountName == "" {
return result, validation.NewError("files.Client", "GetByteRange", "`accountName` cannot be an empty string.")
}
if shareName == "" {
return result, validation.NewError("files.Client", "GetByteRange", "`shareName` cannot be an empty string.")
}
if strings.ToLower(shareName) != shareName {
return result, validation.NewError("files.Client", "GetByteRange", "`shareName` must be a lower-cased string.")
}
if fileName == "" {
return result, validation.NewError("files.Client", "GetByteRange", "`fileName` cannot be an empty string.")
}
if input.StartBytes < 0 {
return result, validation.NewError("files.Client", "GetByteRange", "`input.StartBytes` must be greater or equal to 0.")
}
if input.EndBytes <= 0 {
return result, validation.NewError("files.Client", "GetByteRange", "`input.EndBytes` must be greater than 0.")
}
expectedBytes := input.EndBytes - input.StartBytes
if expectedBytes < (4 * 1024) {
return result, validation.NewError("files.Client", "GetByteRange", "Requested Byte Range must be at least 4KB.")
}
if expectedBytes > (4 * 1024 * 1024) {
return result, validation.NewError("files.Client", "GetByteRange", "Requested Byte Range must be at most 4MB.")
}
req, err := client.GetByteRangePreparer(ctx, accountName, shareName, path, fileName, input)
if err != nil {
err = autorest.NewErrorWithError(err, "files.Client", "GetByteRange", nil, "Failure preparing request")
return
}
resp, err := client.GetByteRangeSender(req)
if err != nil {
result.Response = autorest.Response{Response: resp}
err = autorest.NewErrorWithError(err, "files.Client", "GetByteRange", resp, "Failure sending request")
return
}
result, err = client.GetByteRangeResponder(resp, expectedBytes)
if err != nil {
err = autorest.NewErrorWithError(err, "files.Client", "GetByteRange", resp, "Failure responding to request")
return
}
return
}
// GetByteRangePreparer prepares the GetByteRange request.
func (client Client) GetByteRangePreparer(ctx context.Context, accountName, shareName, path, fileName string, input GetByteRangeInput) (*http.Request, error) {
if path != "" {
path = fmt.Sprintf("%s/", path)
}
pathParameters := map[string]interface{}{
"shareName": autorest.Encode("path", shareName),
"directory": autorest.Encode("path", path),
"fileName": autorest.Encode("path", fileName),
}
headers := map[string]interface{}{
"x-ms-version": APIVersion,
"x-ms-range": fmt.Sprintf("bytes=%d-%d", input.StartBytes, input.EndBytes-1),
}
preparer := autorest.CreatePreparer(
autorest.AsGet(),
autorest.WithBaseURL(endpoints.GetFileEndpoint(client.BaseURI, accountName)),
autorest.WithPathParameters("/{shareName}/{directory}{fileName}", pathParameters),
autorest.WithHeaders(headers))
return preparer.Prepare((&http.Request{}).WithContext(ctx))
}
// GetByteRangeSender sends the GetByteRange request. The method will close the
// http.Response Body if it receives an error.
func (client Client) GetByteRangeSender(req *http.Request) (*http.Response, error) {
return autorest.SendWithSender(client, req,
azure.DoRetryWithRegistration(client.Client))
}
// GetByteRangeResponder handles the response to the GetByteRange request. The method always
// closes the http.Response Body.
func (client Client) GetByteRangeResponder(resp *http.Response, length int64) (result GetByteRangeResult, err error) {
result.Contents = make([]byte, length)
err = autorest.Respond(
resp,
client.ByInspecting(),
azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusPartialContent),
autorest.ByUnmarshallingBytes(&result.Contents),
autorest.ByClosing())
result.Response = autorest.Response{Response: resp}
return
}
|
