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// SPDX-License-Identifier: GPL-3.0-or-later
package scrape
import (
"fmt"
"strconv"
"strings"
"sync"
"time"
rs "github.com/netdata/netdata/go/go.d.plugin/modules/vsphere/resources"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"github.com/vmware/govmomi/performance"
"github.com/vmware/govmomi/vim25/types"
)
type Client interface {
Version() string
PerformanceMetrics([]types.PerfQuerySpec) ([]performance.EntityMetric, error)
}
func New(client Client) *Scraper {
v := &Scraper{Client: client}
v.calcMaxQuery()
return v
}
type Scraper struct {
*logger.Logger
Client
maxQuery int
}
// Default settings for vCenter 6.5 and above is 256, prior versions of vCenter have this set to 64.
func (c *Scraper) calcMaxQuery() {
major, minor, err := parseVersion(c.Version())
if err != nil || major < 6 || minor == 0 {
c.maxQuery = 64
return
}
c.maxQuery = 256
}
func (c Scraper) ScrapeHosts(hosts rs.Hosts) []performance.EntityMetric {
t := time.Now()
pqs := newHostsPerfQuerySpecs(hosts)
ms := c.scrapeMetrics(pqs)
c.Debugf("scraping : scraped metrics for %d/%d hosts, process took %s",
len(ms),
len(hosts),
time.Since(t),
)
return ms
}
func (c Scraper) ScrapeVMs(vms rs.VMs) []performance.EntityMetric {
t := time.Now()
pqs := newVMsPerfQuerySpecs(vms)
ms := c.scrapeMetrics(pqs)
c.Debugf("scraping : scraped metrics for %d/%d vms, process took %s",
len(ms),
len(vms),
time.Since(t),
)
return ms
}
func (c Scraper) scrapeMetrics(pqs []types.PerfQuerySpec) []performance.EntityMetric {
tc := newThrottledCaller(5)
var ms []performance.EntityMetric
lock := &sync.Mutex{}
chunks := chunkify(pqs, c.maxQuery)
for _, chunk := range chunks {
pqs := chunk
job := func() {
c.scrape(&ms, lock, pqs)
}
tc.call(job)
}
tc.wait()
return ms
}
func (c Scraper) scrape(metrics *[]performance.EntityMetric, lock *sync.Mutex, pqs []types.PerfQuerySpec) {
m, err := c.PerformanceMetrics(pqs)
if err != nil {
c.Error(err)
return
}
lock.Lock()
*metrics = append(*metrics, m...)
lock.Unlock()
}
func chunkify(pqs []types.PerfQuerySpec, chunkSize int) (chunks [][]types.PerfQuerySpec) {
for i := 0; i < len(pqs); i += chunkSize {
end := i + chunkSize
if end > len(pqs) {
end = len(pqs)
}
chunks = append(chunks, pqs[i:end])
}
return chunks
}
const (
pqsMaxSample = 1
pqsIntervalID = 20
pqsFormat = "normal"
)
func newHostsPerfQuerySpecs(hosts rs.Hosts) []types.PerfQuerySpec {
pqs := make([]types.PerfQuerySpec, 0, len(hosts))
for _, host := range hosts {
pq := types.PerfQuerySpec{
Entity: host.Ref,
MaxSample: pqsMaxSample,
MetricId: host.MetricList,
IntervalId: pqsIntervalID,
Format: pqsFormat,
}
pqs = append(pqs, pq)
}
return pqs
}
func newVMsPerfQuerySpecs(vms rs.VMs) []types.PerfQuerySpec {
pqs := make([]types.PerfQuerySpec, 0, len(vms))
for _, vm := range vms {
pq := types.PerfQuerySpec{
Entity: vm.Ref,
MaxSample: pqsMaxSample,
MetricId: vm.MetricList,
IntervalId: pqsIntervalID,
Format: pqsFormat,
}
pqs = append(pqs, pq)
}
return pqs
}
func parseVersion(version string) (major, minor int, err error) {
parts := strings.Split(version, ".")
if len(parts) < 2 {
return 0, 0, fmt.Errorf("unparsable version string : %s", version)
}
if major, err = strconv.Atoi(parts[0]); err != nil {
return 0, 0, err
}
if minor, err = strconv.Atoi(parts[1]); err != nil {
return 0, 0, err
}
return major, minor, nil
}
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