mirror of
https://gitee.com/milvus-io/milvus.git
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138 lines
3.8 KiB
Go
138 lines
3.8 KiB
Go
/*
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* # Licensed to the LF AI & Data foundation under one
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* # or more contributor license agreements. See the NOTICE file
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* # distributed with this work for additional information
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* # regarding copyright ownership. The ASF licenses this file
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* # to you under the Apache License, Version 2.0 (the
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* # "License"); you may not use this file except in compliance
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* # with the License. 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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*/
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package metrics
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/*
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#cgo pkg-config: milvus_segcore milvus_common
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#include <stdlib.h>
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#include "segcore/metrics_c.h"
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*/
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import "C"
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import (
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"sort"
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"strings"
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"sync"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/pkg/log"
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)
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// metricSorter is a sortable slice of *dto.Metric.
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type metricSorter []*dto.Metric
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func (s metricSorter) Len() int {
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return len(s)
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}
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func (s metricSorter) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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func (s metricSorter) Less(i, j int) bool {
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if len(s[i].Label) != len(s[j].Label) {
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// This should not happen. The metrics are
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// inconsistent. However, we have to deal with the fact, as
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// people might use custom collectors or metric family injection
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// to create inconsistent metrics. So let's simply compare the
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// number of labels in this case. That will still yield
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// reproducible sorting.
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return len(s[i].Label) < len(s[j].Label)
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}
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for n, lp := range s[i].Label {
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vi := lp.GetValue()
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vj := s[j].Label[n].GetValue()
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if vi != vj {
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return vi < vj
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}
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}
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// We should never arrive here. Multiple metrics with the same
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// label set in the same scrape will lead to undefined ingestion
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// behavior. However, as above, we have to provide stable sorting
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// here, even for inconsistent metrics. So sort equal metrics
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// by their timestamp, with missing timestamps (implying "now")
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// coming last.
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if s[i].TimestampMs == nil {
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return false
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}
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if s[j].TimestampMs == nil {
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return true
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}
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return s[i].GetTimestampMs() < s[j].GetTimestampMs()
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}
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// NormalizeMetricFamilies returns a MetricFamily slice with empty
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// MetricFamilies pruned and the remaining MetricFamilies sorted by name within
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// the slice, with the contained Metrics sorted within each MetricFamily.
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func NormalizeMetricFamilies(metricFamiliesByName map[string]*dto.MetricFamily) []*dto.MetricFamily {
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for _, mf := range metricFamiliesByName {
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sort.Sort(metricSorter(mf.Metric))
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}
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names := make([]string, 0, len(metricFamiliesByName))
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for name, mf := range metricFamiliesByName {
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if len(mf.Metric) > 0 {
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names = append(names, name)
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}
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}
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sort.Strings(names)
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result := make([]*dto.MetricFamily, 0, len(names))
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for _, name := range names {
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result = append(result, metricFamiliesByName[name])
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}
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return result
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}
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func NewCRegistry() *CRegistry {
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return &CRegistry{
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Registry: prometheus.NewRegistry(),
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}
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}
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// only re-write the implementation of Gather()
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type CRegistry struct {
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*prometheus.Registry
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mtx sync.RWMutex
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}
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// Gather implements Gatherer.
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func (r *CRegistry) Gather() (res []*dto.MetricFamily, err error) {
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var parser expfmt.TextParser
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r.mtx.RLock()
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cMetricsStr := C.GetKnowhereMetrics()
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metricsStr := C.GoString(cMetricsStr)
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C.free(unsafe.Pointer(cMetricsStr))
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out, err := parser.TextToMetricFamilies(strings.NewReader(metricsStr))
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if err != nil {
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log.Error("fail to parse prometheus metrics", zap.Error(err))
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return
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}
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res = NormalizeMetricFamilies(out)
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return
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}
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