// CollectMetrics returns filled mts table with metric values. Limits and quotas
// are colllected once per tenant. All hypervisor related statistics are collected
// in one call. This method also performs lazy initalization of plugin. Error
// is returned if initalization or any of required call failed.
func (self *NovaPlugin) CollectMetrics(mts []plugin.MetricType) ([]plugin.MetricType, error) {
if len(mts) > 0 {
err := self.init(mts[0])
if err != nil {
return nil, err
}
} else {
return mts, nil
}
t := time.Now()
limitsFor := map[string]bool{}
quotasFor := map[string]bool{}
hypervisors := false
cluster := false
results := make([]plugin.MetricType, len(mts))
for _, mt := range mts {
id, group, subgroup, _ := parseName(mt.Namespace().Strings())
if group == GROUP_CLUSTER {
cluster = true
continue
}
if group == GROUP_HYPERVISOR {
hypervisors = true
} else {
if subgroup == SUBGROUP_LIMITS {
limitsFor[id] = true
} else {
quotasFor[id] = true
}
}
}
cachedLimits := map[string]map[string]interface{}{}
for tenant, _ := range limitsFor {
limits, err := self.collector.GetLimits(tenant)
if err != nil {
return nil, fmt.Errorf("cannot read limits for %v: (%v)", tenant, err)
}
cachedLimits[tenant] = limits
}
cachedQuotas := map[string]map[string]interface{}{}
var tenantIds map[string]string = nil
for tenant, _ := range quotasFor {
if tenantIds == nil {
tenantIds2, err := self.collector.GetTenants()
if err != nil {
return nil, fmt.Errorf("cannot get tenants list: (%v)", err)
}
tenantIds = tenantIds2
}
quotas, err := self.collector.GetQuotas(tenant, tenantIds[tenant])
if err != nil {
return nil, fmt.Errorf("cannot read quotas for %v: (%v)", tenant, err)
}
cachedQuotas[tenant] = quotas
}
cachedHypervisor := map[string]map[string]interface{}{}
if hypervisors {
hStats, err := self.collector.GetHypervisors()
if err != nil {
return nil, fmt.Errorf("cannot read hypervisors: (%v)", err)
}
cachedHypervisor = hStats
}
cachedClusterConfig := map[string]interface{}{}
if cluster {
cachedClusterConfig = self.collector.GetClusterConfig()
}
for i, mt := range mts {
id, group, subgroup, metric := parseName(mt.Namespace().Strings())
mt := plugin.MetricType{
Namespace_: mt.Namespace(),
Timestamp_: t,
}
if group == GROUP_CLUSTER && id == ID_CONFIG {
mt.Data_ = cachedClusterConfig[metric]
} else {
if group == GROUP_HYPERVISOR {
mt.Data_ = cachedHypervisor[id][metric]
} else {
if subgroup == SUBGROUP_LIMITS {
mt.Data_ = cachedLimits[id][metric]
} else {
mt.Data_ = cachedQuotas[id][metric]
}
}
}
results[i] = mt
}
return results, nil
}
func gathermts(host string, filter []string) ([]plugin.MetricType, error) {
resp, err := http.Get(fmt.Sprintf("%s/metrics", host))
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, errReqFailed
}
mtsmap := make(map[string]plugin.MetricType)
scanner := bufio.NewScanner(resp.Body)
if err != nil {
return nil, err
}
for scanner.Scan() {
txt := scanner.Text()
if !strings.Contains(txt, "{") && !strings.Contains(txt, "#") {
nsslice := strings.Split(txt, " ")
mtsmap[nsslice[0]] = plugin.MetricType{
Namespace_: core.NewNamespace("intel", "etcd", nsslice[0]),
Data_: nsslice[1],
Timestamp_: time.Now(),
}
}
}
// No filter given; this was a GetMetricTypes call.
if len(filter) == 0 {
mts := make([]plugin.MetricType, 0, len(mtsmap)+len(derivatives))
for _, v := range mtsmap {
mts = append(mts, v)
}
for k := range derivatives {
mts = append(mts, plugin.MetricType{Namespace_: core.NewNamespace("intel", "etcd", "derivative", k)})
}
return mts, nil
}
// Walk through filter and pluck out metrics.
// if we find the requested metric in derivatives,
// then derive the value from `from`.
mts := make([]plugin.MetricType, 0, len(filter))
for _, f := range filter {
from, ok := derivatives[f]
if ok {
mt := plugin.MetricType{
Namespace_: core.NewNamespace("intel", "etcd", "derivative", f),
Timestamp_: time.Now(),
}
sum, err := strconv.ParseFloat(mtsmap[from[0]].Data_.(string), 64)
if err != nil {
return nil, err
}
count, err := strconv.ParseFloat(mtsmap[from[1]].Data_.(string), 64)
if err != nil {
return nil, err
}
mt.Data_ = sum / count
mts = append(mts, mt)
continue
}
mt, ok := mtsmap[f]
if ok {
mts = append(mts, mt)
}
}
return mts, nil
}