84 lines
2.7 KiB
Go
84 lines
2.7 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package aws
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import (
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"fmt"
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"net/url"
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"strings"
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"github.com/aws/aws-sdk-go/aws"
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)
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// awsVolumeID represents the ID of the volume in the AWS API, e.g. vol-12345678a
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// The "traditional" format is "vol-12345678"
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// A new longer format is also being introduced: "vol-12345678abcdef01"
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// We should not assume anything about the length or format, though it seems
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// reasonable to assume that volumes will continue to start with "vol-".
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type awsVolumeID string
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func (i awsVolumeID) awsString() *string {
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return aws.String(string(i))
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}
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// KubernetesVolumeID represents the id for a volume in the kubernetes API;
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// a few forms are recognized:
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// * aws://<zone>/<awsVolumeId>
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// * aws:///<awsVolumeId>
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// * <awsVolumeId>
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type KubernetesVolumeID string
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// mapToAWSVolumeID extracts the awsVolumeID from the KubernetesVolumeID
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func (name KubernetesVolumeID) mapToAWSVolumeID() (awsVolumeID, error) {
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// name looks like aws://availability-zone/awsVolumeId
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// The original idea of the URL-style name was to put the AZ into the
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// host, so we could find the AZ immediately from the name without
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// querying the API. But it turns out we don't actually need it for
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// multi-AZ clusters, as we put the AZ into the labels on the PV instead.
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// However, if in future we want to support multi-AZ cluster
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// volume-awareness without using PersistentVolumes, we likely will
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// want the AZ in the host.
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s := string(name)
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if !strings.HasPrefix(s, "aws://") {
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// Assume a bare aws volume id (vol-1234...)
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// Build a URL with an empty host (AZ)
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s = "aws://" + "" + "/" + s
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}
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url, err := url.Parse(s)
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if err != nil {
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// TODO: Maybe we should pass a URL into the Volume functions
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return "", fmt.Errorf("Invalid disk name (%s): %v", name, err)
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}
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if url.Scheme != "aws" {
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return "", fmt.Errorf("Invalid scheme for AWS volume (%s)", name)
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}
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awsID := url.Path
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awsID = strings.Trim(awsID, "/")
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// We sanity check the resulting volume; the two known formats are
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// vol-12345678 and vol-12345678abcdef01
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// TODO: Regex match?
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if strings.Contains(awsID, "/") || !strings.HasPrefix(awsID, "vol-") {
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return "", fmt.Errorf("Invalid format for AWS volume (%s)", name)
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}
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return awsVolumeID(awsID), nil
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}
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