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package blobs
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 GetInput struct {
LeaseID *string
StartByte *int64
EndByte *int64
}
type GetResult struct {
autorest.Response
Contents []byte
}
// Get reads or downloads a blob from the system, including its metadata and properties.
func (client Client) Get(ctx context.Context, accountName, containerName, blobName string, input GetInput) (result GetResult, err error) {
if accountName == "" {
return result, validation.NewError("blobs.Client", "Get", "`accountName` cannot be an empty string.")
}
if containerName == "" {
return result, validation.NewError("blobs.Client", "Get", "`containerName` cannot be an empty string.")
}
if strings.ToLower(containerName) != containerName {
return result, validation.NewError("blobs.Client", "Get", "`containerName` must be a lower-cased string.")
}
if blobName == "" {
return result, validation.NewError("blobs.Client", "Get", "`blobName` cannot be an empty string.")
}
if input.LeaseID != nil && *input.LeaseID == "" {
return result, validation.NewError("blobs.Client", "Get", "`input.LeaseID` should either be specified or nil, not an empty string.")
}
if (input.StartByte != nil && input.EndByte == nil) || input.StartByte == nil && input.EndByte != nil {
return result, validation.NewError("blobs.Client", "Get", "`input.StartByte` and `input.EndByte` must both be specified, or both be nil.")
}
req, err := client.GetPreparer(ctx, accountName, containerName, blobName, input)
if err != nil {
err = autorest.NewErrorWithError(err, "blobs.Client", "Get", nil, "Failure preparing request")
return
}
resp, err := client.GetSender(req)
if err != nil {
result.Response = autorest.Response{Response: resp}
err = autorest.NewErrorWithError(err, "blobs.Client", "Get", resp, "Failure sending request")
return
}
result, err = client.GetResponder(resp)
if err != nil {
err = autorest.NewErrorWithError(err, "blobs.Client", "Get", resp, "Failure responding to request")
return
}
return
}
// GetPreparer prepares the Get request.
func (client Client) GetPreparer(ctx context.Context, accountName, containerName, blobName string, input GetInput) (*http.Request, error) {
pathParameters := map[string]interface{}{
"containerName": autorest.Encode("path", containerName),
"blobName": autorest.Encode("path", blobName),
}
headers := map[string]interface{}{
"x-ms-version": APIVersion,
}
if input.StartByte != nil && input.EndByte != nil {
headers["x-ms-range"] = fmt.Sprintf("bytes=%d-%d", *input.StartByte, *input.EndByte)
}
preparer := autorest.CreatePreparer(
autorest.AsGet(),
autorest.WithBaseURL(endpoints.GetBlobEndpoint(client.BaseURI, accountName)),
autorest.WithPathParameters("/{containerName}/{blobName}", pathParameters),
autorest.WithHeaders(headers))
return preparer.Prepare((&http.Request{}).WithContext(ctx))
}
// GetSender sends the Get request. The method will close the
// http.Response Body if it receives an error.
func (client Client) GetSender(req *http.Request) (*http.Response, error) {
return autorest.SendWithSender(client, req,
azure.DoRetryWithRegistration(client.Client))
}
// GetResponder handles the response to the Get request. The method always
// closes the http.Response Body.
func (client Client) GetResponder(resp *http.Response) (result GetResult, err error) {
if resp != nil && int(resp.ContentLength) > 0 {
result.Contents = make([]byte, resp.ContentLength)
}
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
}
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