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refactor: gin prometheus for api (#1371)

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Signed-off-by: rfyiamcool <rfyiamcool@163.com>
pull/1348/head
fengyun.rui 1 year ago committed by GitHub
parent 2496a16a88
commit 65c1c412da
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1 changed files with 76 additions and 66 deletions
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92
pkg/common/ginprometheus/ginprometheus.go
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@ -3,7 +3,7 @@ package ginprometheus
import (
"bytes"
"fmt"
"io/ioutil"
"io"
"net/http"
"os"
"strconv"
@ -17,15 +17,16 @@ import (
var defaultMetricPath = "/metrics"
// counter, counter_vec, gauge, gauge_vec,
// histogram, histogram_vec, summary, summary_vec
var reqCnt = &Metric{
// histogram, histogram_vec, summary, summary_vec.
var (
reqCounter = &Metric{
ID: "reqCnt",
Name: "requests_total",
Description: "How many HTTP requests processed, partitioned by status code and HTTP method.",
Type: "counter_vec",
Args: []string{"code", "method", "handler", "host", "url"}}
var reqDur = &Metric{
reqDuration = &Metric{
ID: "reqDur",
Name: "request_duration_seconds",
Description: "The HTTP request latencies in seconds.",
@ -33,24 +34,25 @@ var reqDur = &Metric{
Args: []string{"code", "method", "url"},
}
var resSz = &Metric{
resSize = &Metric{
ID: "resSz",
Name: "response_size_bytes",
Description: "The HTTP response sizes in bytes.",
Type: "summary"}
var reqSz = &Metric{
reqSize = &Metric{
ID: "reqSz",
Name: "request_size_bytes",
Description: "The HTTP request sizes in bytes.",
Type: "summary"}
var standardMetrics = []*Metric{
reqCnt,
reqDur,
resSz,
reqSz,
standardMetrics = []*Metric{
reqCounter,
reqDuration,
resSize,
reqSize,
}
)
/*
RequestCounterURLLabelMappingFn is a function which can be supplied to the middleware to control
@ -74,7 +76,7 @@ which would map "/customer/alice" and "/customer/bob" to their template "/custom
type RequestCounterURLLabelMappingFn func(c *gin.Context) string
// Metric is a definition for the name, description, type, ID, and
// prometheus.Collector type (i.e. CounterVec, Summary, etc) of each metric
// prometheus.Collector type (i.e. CounterVec, Summary, etc) of each metric.
type Metric struct {
MetricCollector prometheus.Collector
ID string
@ -84,7 +86,7 @@ type Metric struct {
Args []string
}
// Prometheus contains the metrics gathered by the instance and its path
// Prometheus contains the metrics gathered by the instance and its path.
type Prometheus struct {
reqCnt *prometheus.CounterVec
reqDur *prometheus.HistogramVec
@ -102,7 +104,7 @@ type Prometheus struct {
URLLabelFromContext string
}
// PrometheusPushGateway contains the configuration for pushing to a Prometheus pushgateway (optional)
// PrometheusPushGateway contains the configuration for pushing to a Prometheus pushgateway (optional).
type PrometheusPushGateway struct {
// Push interval in seconds
@ -112,7 +114,7 @@ type PrometheusPushGateway struct {
// where JOBNAME can be any string of your choice
PushGatewayURL string
// Local metrics URL where metrics are fetched from, this could be ommited in the future
// Local metrics URL where metrics are fetched from, this could be omitted in the future
// if implemented using prometheus common/expfmt instead
MetricsURL string
@ -120,9 +122,11 @@ type PrometheusPushGateway struct {
Job string
}
// NewPrometheus generates a new set of metrics with a certain subsystem name
// NewPrometheus generates a new set of metrics with a certain subsystem name.
func NewPrometheus(subsystem string, customMetricsList ...[]*Metric) *Prometheus {
if subsystem == "" {
subsystem = "app"
}
var metricsList []*Metric
@ -131,16 +135,13 @@ func NewPrometheus(subsystem string, customMetricsList ...[]*Metric) *Prometheus
} else if len(customMetricsList) == 1 {
metricsList = customMetricsList[0]
}
for _, metric := range standardMetrics {
metricsList = append(metricsList, metric)
}
metricsList = append(metricsList, standardMetrics...)
p := &Prometheus{
MetricsList: metricsList,
MetricsPath: defaultMetricPath,
ReqCntURLLabelMappingFn: func(c *gin.Context) string {
return c.Request.URL.Path
return c.FullPath() // e.g. /user/:id , /user/:id/info
},
}
@ -150,7 +151,7 @@ func NewPrometheus(subsystem string, customMetricsList ...[]*Metric) *Prometheus
}
// SetPushGateway sends metrics to a remote pushgateway exposed on pushGatewayURL
// every pushIntervalSeconds. Metrics are fetched from metricsURL
// every pushIntervalSeconds. Metrics are fetched from metricsURL.
func (p *Prometheus) SetPushGateway(pushGatewayURL, metricsURL string, pushIntervalSeconds time.Duration) {
p.Ppg.PushGatewayURL = pushGatewayURL
p.Ppg.MetricsURL = metricsURL
@ -158,13 +159,13 @@ func (p *Prometheus) SetPushGateway(pushGatewayURL, metricsURL string, pushInter
p.startPushTicker()
}
// SetPushGatewayJob job name, defaults to "gin"
// SetPushGatewayJob job name, defaults to "gin".
func (p *Prometheus) SetPushGatewayJob(j string) {
p.Ppg.Job = j
}
// SetListenAddress for exposing metrics on address. If not set, it will be exposed at the
// same address of the gin engine that is being used
// same address of the gin engine that is being used.
func (p *Prometheus) SetListenAddress(address string) {
p.listenAddress = address
if p.listenAddress != "" {
@ -181,7 +182,7 @@ func (p *Prometheus) SetListenAddressWithRouter(listenAddress string, r *gin.Eng
}
}
// SetMetricsPath set metrics paths
// SetMetricsPath set metrics paths.
func (p *Prometheus) SetMetricsPath(e *gin.Engine) {
if p.listenAddress != "" {
@ -192,7 +193,7 @@ func (p *Prometheus) SetMetricsPath(e *gin.Engine) {
}
}
// SetMetricsPathWithAuth set metrics paths with authentication
// SetMetricsPathWithAuth set metrics paths with authentication.
func (p *Prometheus) SetMetricsPathWithAuth(e *gin.Engine, accounts gin.Accounts) {
if p.listenAddress != "" {
@ -205,34 +206,43 @@ func (p *Prometheus) SetMetricsPathWithAuth(e *gin.Engine, accounts gin.Accounts
}
func (p *Prometheus) runServer() {
if p.listenAddress != "" {
go p.router.Run(p.listenAddress)
}
}
func (p *Prometheus) getMetrics() []byte {
response, _ := http.Get(p.Ppg.MetricsURL)
response, err := http.Get(p.Ppg.MetricsURL)
if err != nil {
return nil
}
defer response.Body.Close()
body, _ := ioutil.ReadAll(response.Body)
body, _ := io.ReadAll(response.Body)
return body
}
var hostname, _ = os.Hostname()
func (p *Prometheus) getPushGatewayURL() string {
h, _ := os.Hostname()
if p.Ppg.Job == "" {
p.Ppg.Job = "gin"
}
return p.Ppg.PushGatewayURL + "/metrics/job/" + p.Ppg.Job + "/instance/" + h
return p.Ppg.PushGatewayURL + "/metrics/job/" + p.Ppg.Job + "/instance/" + hostname
}
func (p *Prometheus) sendMetricsToPushGateway(metrics []byte) {
req, err := http.NewRequest("POST", p.getPushGatewayURL(), bytes.NewBuffer(metrics))
if err != nil {
return
}
client := &http.Client{}
if _, err = client.Do(req); err != nil {
resp, err := client.Do(req)
if err != nil {
fmt.Println("Error sending to push gateway error:", err.Error())
}
resp.Body.Close()
}
func (p *Prometheus) startPushTicker() {
@ -244,7 +254,7 @@ func (p *Prometheus) startPushTicker() {
}()
}
// NewMetric associates prometheus.Collector based on Metric.Type
// NewMetric associates prometheus.Collector based on Metric.Type.
func NewMetric(m *Metric, subsystem string) prometheus.Collector {
var metric prometheus.Collector
switch m.Type {
@ -321,20 +331,20 @@ func NewMetric(m *Metric, subsystem string) prometheus.Collector {
}
func (p *Prometheus) registerMetrics(subsystem string) {
for _, metricDef := range p.MetricsList {
metric := NewMetric(metricDef, subsystem)
if err := prometheus.Register(metric); err != nil {
fmt.Println("could not be registered in Prometheus,metricDef.Name:", metricDef.Name, " error:", err.Error())
}
switch metricDef {
case reqCnt:
case reqCounter:
p.reqCnt = metric.(*prometheus.CounterVec)
case reqDur:
case reqDuration:
p.reqDur = metric.(*prometheus.HistogramVec)
case resSz:
case resSize:
p.resSz = metric.(prometheus.Summary)
case reqSz:
case reqSize:
p.reqSz = metric.(prometheus.Summary)
}
metricDef.MetricCollector = metric
@ -353,7 +363,7 @@ func (p *Prometheus) UseWithAuth(e *gin.Engine, accounts gin.Accounts) {
p.SetMetricsPathWithAuth(e, accounts)
}
// HandlerFunc defines handler function for middleware
// HandlerFunc defines handler function for middleware.
func (p *Prometheus) HandlerFunc() gin.HandlerFunc {
return func(c *gin.Context) {
if c.Request.URL.Path == p.MetricsPath {
@ -393,7 +403,7 @@ func prometheusHandler() gin.HandlerFunc {
}
func computeApproximateRequestSize(r *http.Request) int {
s := 0
var s int
if r.URL != nil {
s = len(r.URL.Path)
}

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