forked from TrueCloudLab/restic
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
// +build go1.7
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package management
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// Copyright 2017 Microsoft Corporation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import (
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"encoding/xml"
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"errors"
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"fmt"
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"time"
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)
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var (
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// ErrOperationCancelled from WaitForOperation when the polling loop is
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// cancelled through signaling the channel.
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ErrOperationCancelled = errors.New("Polling for operation status cancelled")
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)
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// GetOperationStatusResponse represents an in-flight operation. Use
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// client.GetOperationStatus() to get the operation given the operation ID, or
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// use WaitForOperation() to poll and wait until the operation has completed.
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// See https://msdn.microsoft.com/en-us/library/azure/ee460783.aspx
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type GetOperationStatusResponse struct {
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XMLName xml.Name `xml:"http://schemas.microsoft.com/windowsazure Operation"`
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ID string
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Status OperationStatus
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HTTPStatusCode string
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Error *AzureError
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}
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// OperationStatus describes the states an Microsoft Azure Service Management
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// operation an be in.
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type OperationStatus string
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// List of states an operation can be reported as
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const (
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OperationStatusInProgress OperationStatus = "InProgress"
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OperationStatusSucceeded OperationStatus = "Succeeded"
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OperationStatusFailed OperationStatus = "Failed"
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)
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// OperationID is assigned by Azure API and can be used to look up the status of
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// an operation
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type OperationID string
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func (c client) GetOperationStatus(operationID OperationID) (GetOperationStatusResponse, error) {
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operation := GetOperationStatusResponse{}
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if operationID == "" {
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return operation, fmt.Errorf(errParamNotSpecified, "operationID")
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}
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url := fmt.Sprintf("operations/%s", operationID)
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response, azureErr := c.SendAzureGetRequest(url)
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if azureErr != nil {
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return operation, azureErr
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}
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err := xml.Unmarshal(response, &operation)
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return operation, err
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}
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func (c client) WaitForOperation(operationID OperationID, cancel chan struct{}) error {
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for {
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done, err := c.checkOperationStatus(operationID)
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if err != nil || done {
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return err
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}
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select {
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case <-time.After(c.config.OperationPollInterval):
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case <-cancel:
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return ErrOperationCancelled
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}
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}
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}
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func (c client) checkOperationStatus(id OperationID) (done bool, err error) {
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op, err := c.GetOperationStatus(id)
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if err != nil {
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return false, fmt.Errorf("Failed to get operation status '%s': %v", id, err)
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}
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switch op.Status {
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case OperationStatusSucceeded:
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return true, nil
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case OperationStatusFailed:
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if op.Error != nil {
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return true, op.Error
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}
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return true, fmt.Errorf("Azure Operation (x-ms-request-id=%s) has failed", id)
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case OperationStatusInProgress:
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return false, nil
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default:
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return false, fmt.Errorf("Unknown operation status returned from API: %s (x-ms-request-id=%s)", op.Status, id)
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}
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}
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