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metrics.go
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metrics.go
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package unleash
import (
"bytes"
"encoding/json"
"fmt"
"github.com/Unleash/unleash-client-go/internal/api"
"net/http"
"net/url"
"time"
)
// MetricsData represents the data sent to the unleash server.
type MetricsData struct {
// AppName is the name of the application.
AppName string `json:"appName"`
// InstanceID is the instance identifier.
InstanceID string `json:"instanceId"`
// Bucket is the payload data sent to the server.
Bucket api.Bucket `json:"bucket"`
}
// ClientData represents the data sent to the unleash during registration.
type ClientData struct {
// AppName is the name of the application.
AppName string `json:"appName"`
// InstanceID is the instance identifier.
InstanceID string `json:"instanceId"`
// Optional field that describes the sdk version (name:version)
SDKVersion string `json:"sdkVersion"`
// Strategies is a list of names of the strategies supported by the client.
Strategies []string `json:"strategies"`
// Started indicates the time at which the client was created.
Started time.Time `json:"started"`
// Interval specifies the time interval (in ms) that the client is using for refreshing
// feature toggles.
Interval int64 `json:"interval"`
}
type metric struct {
// Name is the name of the feature toggle.
Name string
// Enabled indicates whether the feature was enabled or not.
Enabled bool
}
type metrics struct {
metricsChannels
options metricsOptions
started time.Time
bucket api.Bucket
countChannel chan metric
stopped chan bool
timer *time.Timer
}
func newMetrics(options metricsOptions, channels metricsChannels) *metrics {
m := &metrics{
metricsChannels: channels,
options: options,
started: time.Now(),
countChannel: make(chan metric),
stopped: make(chan bool),
}
if m.options.httpClient == nil {
m.options.httpClient = http.DefaultClient
}
m.resetBucket()
if m.options.metricsInterval > 0 {
m.startTimer()
m.registerInstance()
go m.sync()
}
return m
}
func (m *metrics) Close() error {
m.stop()
return nil
}
func (m *metrics) startTimer() {
if m.options.disableMetrics {
return
}
m.timer = time.NewTimer(m.options.metricsInterval)
}
func (m *metrics) stop() {
if !m.timer.Stop() {
<-m.timer.C
}
m.stopped <- true
}
func (m *metrics) sync() {
for {
select {
case mc := <-m.countChannel:
t, exists := m.bucket.Toggles[mc.Name]
if !exists {
t = api.ToggleCount{}
}
if mc.Enabled {
t.Yes++
} else {
t.No++
}
m.metricsChannels.count <- mc
m.bucket.Toggles[mc.Name] = t
case <-m.timer.C:
m.sendMetrics()
case <-m.stopped:
m.options.disableMetrics = true
return
}
}
}
func (m *metrics) registerInstance() {
if m.options.disableMetrics {
return
}
u, _ := m.options.url.Parse("./client/register")
payload := m.getClientData()
resp, err := m.doPost(u, payload)
if err != nil {
m.err(err)
return
}
if resp.StatusCode < http.StatusOK || resp.StatusCode > http.StatusMultipleChoices {
m.warn(fmt.Errorf("%s return %d", u.String(), resp.StatusCode))
}
m.registered <- payload
}
func (m *metrics) sendMetrics() {
if m.options.disableMetrics {
return
}
if m.bucket.IsEmpty() {
m.resetBucket()
m.startTimer()
return
}
u, _ := m.options.url.Parse("./client/metrics")
payload := m.getPayload()
m.startTimer()
resp, err := m.doPost(u, payload)
if err != nil {
m.err(err)
return
}
if resp.StatusCode == http.StatusNotFound {
m.warn(fmt.Errorf("%s return 404, stopping metrics", u.String()))
m.stop()
return
}
if resp.StatusCode < http.StatusOK || resp.StatusCode > http.StatusMultipleChoices {
m.warn(fmt.Errorf("%s return %d", u.String(), resp.StatusCode))
}
m.sent <- payload
}
func (m *metrics) doPost(url *url.URL, payload interface{}) (*http.Response, error) {
var body bytes.Buffer
enc := json.NewEncoder(&body)
if err := enc.Encode(payload); err != nil {
return nil, err
}
req, err := http.NewRequest("POST", url.String(), &body)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add("UNLEASH-APPNAME", m.options.appName)
req.Header.Add("UNLEASH-INSTANCEID", m.options.instanceId)
req.Header.Add("User-Agent", m.options.appName)
for k, v := range m.options.customHeaders {
req.Header[k] = v
}
return m.options.httpClient.Do(req)
}
func (m metrics) count(name string, enabled bool) {
if m.options.disableMetrics {
return
}
m.countChannel <- metric{name, enabled}
}
func (m *metrics) resetBucket() {
m.bucket = api.Bucket{
Start: time.Now(),
Toggles: map[string]api.ToggleCount{},
}
}
func (m *metrics) closeBucket() {
m.bucket.Stop = time.Now()
}
func (m *metrics) getPayload() MetricsData {
m.closeBucket()
metricsData := m.getMetricsData()
m.resetBucket()
return metricsData
}
func (m metrics) getClientData() ClientData {
return ClientData{
m.options.appName,
m.options.instanceId,
fmt.Sprintf("%s:%s", clientName, clientVersion),
m.options.strategies,
m.started,
int64(m.options.metricsInterval.Seconds()),
}
}
func (m metrics) getMetricsData() MetricsData {
return MetricsData{
m.options.appName,
m.options.instanceId,
m.bucket,
}
}