Cleanup collection of prometheus metrics
This commit is contained in:
Manuel de Brito Fontes
parent
1d38e3a384
commit
7ba389c1d0
11 changed files with 643 additions and 480 deletions
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/*
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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 main
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import (
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"encoding/json"
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"fmt"
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"github.com/golang/glog"
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"io/ioutil"
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"net/http"
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"regexp"
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"strconv"
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)
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var (
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ac = regexp.MustCompile(`Active connections: (\d+)`)
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sahr = regexp.MustCompile(`(\d+)\s(\d+)\s(\d+)`)
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reading = regexp.MustCompile(`Reading: (\d+)`)
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writing = regexp.MustCompile(`Writing: (\d+)`)
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waiting = regexp.MustCompile(`Waiting: (\d+)`)
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)
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type nginxStatus struct {
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// Active total number of active connections
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Active int
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// Accepted total number of accepted client connections
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Accepted int
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// Handled total number of handled connections. Generally, the parameter value is the same as accepts unless some resource limits have been reached (for example, the worker_connections limit).
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Handled int
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// Requests total number of client requests.
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Requests int
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// Reading current number of connections where nginx is reading the request header.
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Reading int
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// Writing current number of connections where nginx is writing the response back to the client.
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Writing int
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// Waiting current number of idle client connections waiting for a request.
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Waiting int
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}
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// https://github.com/vozlt/nginx-module-vts
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type Vts struct {
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NginxVersion string `json:"nginxVersion"`
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LoadMsec int `json:"loadMsec"`
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NowMsec int `json:"nowMsec"`
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// Total connections and requests(same as stub_status_module in NGINX)
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Connections Connections `json:"connections"`
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// Traffic(in/out) and request and response counts and cache hit ratio per each server zone
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ServerZones map[string]ServerZone `json:"serverZones"`
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// Traffic(in/out) and request and response counts and cache hit ratio per each server zone filtered through
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// the vhost_traffic_status_filter_by_set_key directive
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FilterZones map[string]map[string]FilterZone `json:"filterZones"`
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// Traffic(in/out) and request and response counts per server in each upstream group
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UpstreamZones map[string][]UpstreamZone `json:"upstreamZones"`
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}
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type ServerZone struct {
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RequestCounter float64 `json:"requestCounter"`
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InBytes float64 `json:"inBytes"`
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OutBytes float64 `json:"outBytes"`
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Responses Response `json:"responses"`
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Cache Cache `json:"responses"`
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}
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type FilterZone struct {
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RequestCounter float64 `json:"requestCounter"`
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InBytes float64 `json:"inBytes"`
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OutBytes float64 `json:"outBytes"`
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Cache Cache `json:"responses"`
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Responses Response `json:"responses"`
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}
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type UpstreamZone struct {
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Responses Response `json:"responses"`
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Server string `json:"server"`
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RequestCounter float64 `json:"requestCounter"`
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InBytes float64 `json:"inBytes"`
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OutBytes float64 `json:"outBytes"`
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ResponseMsec float64 `json:"responseMsec"`
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Weight float64 `json:"weight"`
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MaxFails float64 `json:"maxFails"`
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FailTimeout float64 `json:"failTimeout"`
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Backup BoolToFloat64 `json:"backup"`
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Down BoolToFloat64 `json:"down"`
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}
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type Cache struct {
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Miss float64 `json:"miss"`
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Bypass float64 `json:"bypass"`
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Expired float64 `json:"expired"`
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Stale float64 `json:"stale"`
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Updating float64 `json:"updating"`
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Revalidated float64 `json:"revalidated"`
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Hit float64 `json:"hit"`
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Scarce float64 `json:"scarce"`
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}
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type Response struct {
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OneXx float64 `json:"1xx"`
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TwoXx float64 `json:"2xx"`
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TheeXx float64 `json:"3xx"`
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FourXx float64 `json:"4xx"`
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FiveXx float64 `json:"5xx"`
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}
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type Connections struct {
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Active float64 `json:"active"`
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Reading float64 `json:"reading"`
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Writing float64 `json:"writing"`
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Waiting float64 `json:"waiting"`
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Accepted float64 `json:"accepted"`
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Handled float64 `json:"handled"`
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Requests float64 `json:"requests"`
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}
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type BoolToFloat64 float64
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func (bit BoolToFloat64) UnmarshalJSON(data []byte) error {
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asString := string(data)
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if asString == "1" || asString == "true" {
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bit = 1
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} else if asString == "0" || asString == "false" {
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bit = 0
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} else {
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return fmt.Errorf(fmt.Sprintf("Boolean unmarshal error: invalid input %s", asString))
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}
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return nil
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}
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func getNginxStatus() (*nginxStatus, error) {
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url := fmt.Sprintf("http://localhost:%v%v", ngxHealthPort, ngxStatusPath)
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glog.V(3).Infof("start scrapping url: %v", url)
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data, err := httpBody(url)
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if err != nil {
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return nil, fmt.Errorf("unexpected error scraping nginx status page: %v", err)
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}
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return parse(string(data)), nil
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}
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func httpBody(url string) ([]byte, error) {
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resp, err := http.DefaultClient.Get(url)
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if err != nil {
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return nil, fmt.Errorf("unexpected error scraping nginx : %v", err)
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}
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("unexpected error scraping nginx (%v)", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode < 200 || resp.StatusCode >= 400 {
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return nil, fmt.Errorf("unexpected error scraping nginx (status %v)", resp.StatusCode)
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}
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return data, nil
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}
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func getNginxVtsMetrics() (*Vts, error) {
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url := fmt.Sprintf("http://localhost:%v%v", ngxHealthPort, ngxVtsPath)
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glog.V(3).Infof("start scrapping url: %v", url)
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data, err := httpBody(url)
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if err != nil {
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return nil, fmt.Errorf("unexpected error scraping nginx vts (%v)", err)
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}
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var vts Vts
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err = json.Unmarshal(data, &vts)
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if err != nil {
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return nil, fmt.Errorf("unexpected error json unmarshal (%v)", err)
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}
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glog.V(3).Infof("scrap returned : %v", vts)
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return &vts, nil
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}
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func parse(data string) *nginxStatus {
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acr := ac.FindStringSubmatch(data)
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sahrr := sahr.FindStringSubmatch(data)
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readingr := reading.FindStringSubmatch(data)
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writingr := writing.FindStringSubmatch(data)
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waitingr := waiting.FindStringSubmatch(data)
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return &nginxStatus{
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toInt(acr, 1),
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toInt(sahrr, 1),
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toInt(sahrr, 2),
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toInt(sahrr, 3),
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toInt(readingr, 1),
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toInt(writingr, 1),
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toInt(waitingr, 1),
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}
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}
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func toInt(data []string, pos int) int {
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if len(data) == 0 {
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return 0
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}
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if pos > len(data) {
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return 0
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}
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if v, err := strconv.Atoi(data[pos]); err == nil {
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return v
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}
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return 0
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}
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