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plugins/nova: split server_group_members usage measurement into a sep…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /******************************************************************************* | ||
| * | ||
| * Copyright 2020-2023 SAP SE | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You should have received a copy of the License along with this | ||
| * program. If not, you may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| *******************************************************************************/ | ||
|
|
||
| package plugins | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| "github.com/gophercloud/gophercloud" | ||
| "github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/servergroups" | ||
| ) | ||
|
|
||
| // The reason why this type exists at all is that: | ||
| // a) Nova does not report the usage for server_group_members directly, and | ||
| // b) we cannot ask for server groups in a specific foreign project. | ||
| // | ||
| // We can only list *all* server groups globally at once. Since this is very | ||
| // expensive, we only do it once every few minutes. | ||
| type novaServerGroupProber struct { | ||
| NovaV2 *gophercloud.ServiceClient | ||
| UsageByProjectID map[string]uint64 | ||
| LastScrapeTime time.Time // only initialized if .usageByProjectID != nil | ||
| } | ||
|
|
||
| func newNovaServerGroupProber(novaV2 *gophercloud.ServiceClient) *novaServerGroupProber { | ||
| return &novaServerGroupProber{NovaV2: novaV2} | ||
| } | ||
|
|
||
| func (p *novaServerGroupProber) GetMemberUsageForProject(projectID string) (uint64, error) { | ||
| //refresh cache if not initialized or outdated | ||
| var err error | ||
| if p.UsageByProjectID == nil || time.Since(p.LastScrapeTime) > 10*time.Minute { | ||
| err = p.fillCache() | ||
| } | ||
|
|
||
| return p.UsageByProjectID[projectID], err | ||
| } | ||
|
|
||
| func (p *novaServerGroupProber) fillCache() error { | ||
| //When paginating through the list of server groups, perform steps slightly | ||
| //smaller than the actual page size, in order to correctly detect insertions | ||
| //and deletions that may cause list entries to shift around while we iterate | ||
| //over them. | ||
| const pageSize int = 500 | ||
| stepSize := pageSize * 9 / 10 | ||
| var currentOffset int | ||
| serverGroupSeen := make(map[string]bool) | ||
| usageByProjectID := make(map[string]uint64) | ||
| for { | ||
| groups, err := p.getServerGroupsPage(pageSize, currentOffset) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, sg := range groups { | ||
| if !serverGroupSeen[sg.ID] { | ||
| usageByProjectID[sg.ProjectID] += uint64(len(sg.Members)) | ||
| serverGroupSeen[sg.ID] = true | ||
| } | ||
| } | ||
|
|
||
| //abort after the last page | ||
| if len(groups) < pageSize { | ||
| break | ||
| } | ||
| currentOffset += stepSize | ||
| } | ||
|
|
||
| p.UsageByProjectID = usageByProjectID | ||
| p.LastScrapeTime = time.Now() | ||
| return nil | ||
| } | ||
|
|
||
| func (p *novaServerGroupProber) getServerGroupsPage(limit, offset int) ([]servergroups.ServerGroup, error) { | ||
| allPages, err := servergroups.List(p.NovaV2, servergroups.ListOpts{AllProjects: true, Limit: limit, Offset: offset}).AllPages() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| allServerGroups, err := servergroups.ExtractServerGroups(allPages) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return allServerGroups, nil | ||
| } |