chrly/eventsubscribers/stats_reporter.go

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package eventsubscribers
import (
"net/http"
"strings"
"sync"
"time"
"github.com/mono83/slf"
"github.com/elyby/chrly/api/mojang"
"github.com/elyby/chrly/dispatcher"
)
type StatsReporter struct {
Reporter slf.StatsReporter
Prefix string
timersMap sync.Map
}
func (s *StatsReporter) ConfigureWithDispatcher(d dispatcher.EventDispatcher) {
// Per request events
d.Subscribe("skinsystem:before_request", s.handleBeforeRequest)
d.Subscribe("skinsystem:after_request", s.handleAfterRequest)
// Authentication events
d.Subscribe("authenticator:success", s.incCounterHandler("authentication.challenge")) // TODO: legacy, remove in v5
d.Subscribe("authenticator:success", s.incCounterHandler("authentication.success"))
d.Subscribe("authentication:error", s.incCounterHandler("authentication.challenge")) // TODO: legacy, remove in v5
d.Subscribe("authentication:error", s.incCounterHandler("authentication.failed"))
// Mojang signed textures source events
d.Subscribe("mojang_textures:call", s.incCounterHandler("mojang_textures.request"))
d.Subscribe("mojang_textures:usernames:after_cache", func(username string, uuid string, err error) {
if err != nil {
return
}
if uuid == "" {
s.incCounter("mojang_textures:usernames:cache_hit_nil")
} else {
s.incCounter("mojang_textures:usernames:cache_hit")
}
})
d.Subscribe("mojang_textures:textures:after_cache", func(uuid string, textures *mojang.SignedTexturesResponse, err error) {
if err != nil {
return
}
if textures != nil {
s.incCounter("mojang_textures.textures.cache_hit")
}
})
d.Subscribe("mojang_textures:already_processing", s.incCounterHandler("mojang_textures.already_scheduled"))
d.Subscribe("mojang_textures:usernames:after_call", func(username string, profile *mojang.ProfileInfo, err error) {
if err != nil {
return
}
if profile == nil {
s.incCounter("mojang_textures.usernames.uuid_miss")
} else {
s.incCounter("mojang_textures.usernames.uuid_hit")
}
})
d.Subscribe("mojang_textures:textures:before_call", s.incCounterHandler("mojang_textures.textures.request"))
d.Subscribe("mojang_textures:textures:after_call", func(uuid string, textures *mojang.SignedTexturesResponse, err error) {
if err != nil {
return
}
if textures == nil {
s.incCounter("mojang_textures.usernames.textures_miss")
} else {
s.incCounter("mojang_textures.usernames.textures_hit")
}
})
d.Subscribe("mojang_textures:before_result", func(username string, uuid string) {
s.startTimeRecording("mojang_textures_result_time_" + username)
})
d.Subscribe("mojang_textures:after_result", func(username string, textures *mojang.SignedTexturesResponse, err error) {
s.finalizeTimeRecording("mojang_textures_result_time_"+username, "mojang_textures.result_time")
})
d.Subscribe("mojang_textures:textures:before_call", func(uuid string) {
s.startTimeRecording("mojang_textures_provider_time_" + uuid)
})
d.Subscribe("mojang_textures:textures:after_call", func(uuid string, textures *mojang.SignedTexturesResponse, err error) {
s.finalizeTimeRecording("mojang_textures_provider_time_"+uuid, "mojang_textures.textures.request_time")
})
// Mojang UUIDs batch provider metrics
d.Subscribe("mojang_textures:batch_uuids_provider:queued", s.incCounterHandler("mojang_textures.usernames.queued"))
d.Subscribe("mojang_textures:batch_uuids_provider:round", func(usernames []string, queueSize int) {
s.updateGauge("mojang_textures.usernames.iteration_size", int64(len(usernames)))
s.updateGauge("mojang_textures.usernames.queue_size", int64(queueSize))
})
d.Subscribe("mojang_textures:batch_uuids_provider:before_round", func() {
s.startTimeRecording("batch_uuids_provider_round_time")
})
d.Subscribe("mojang_textures:batch_uuids_provider:after_round", func() {
s.finalizeTimeRecording("batch_uuids_provider_round_time", "mojang_textures.usernames.round_time")
})
}
func (s *StatsReporter) handleBeforeRequest(req *http.Request) {
var key string
m := req.Method
p := req.URL.Path
if p == "/skins" {
key = "skins.get_request"
} else if strings.HasPrefix(p, "/skins/") {
key = "skins.request"
} else if p == "/cloaks" {
key = "capes.get_request"
} else if strings.HasPrefix(p, "/cloaks/") {
key = "capes.request"
} else if strings.HasPrefix(p, "/textures/signed/") {
key = "signed_textures.request"
} else if strings.HasPrefix(p, "/textures/") {
key = "textures.request"
} else if m == http.MethodPost && p == "/api/skins" {
key = "api.skins.post.request"
} else if m == http.MethodDelete && strings.HasPrefix(p, "/api/skins/") {
key = "api.skins.delete.request"
} else {
return
}
s.incCounter(key)
}
func (s *StatsReporter) handleAfterRequest(req *http.Request, code int) {
var key string
m := req.Method
p := req.URL.Path
if m == http.MethodPost && p == "/api/skins" && code == http.StatusCreated {
key = "api.skins.post.success"
} else if m == http.MethodPost && p == "/api/skins" && code == http.StatusBadRequest {
key = "api.skins.post.validation_failed"
} else if m == http.MethodDelete && strings.HasPrefix(p, "/api/skins/") && code == http.StatusNoContent {
key = "api.skins.delete.success"
} else if m == http.MethodDelete && strings.HasPrefix(p, "/api/skins/") && code == http.StatusNotFound {
key = "api.skins.delete.not_found"
} else {
return
}
s.incCounter(key)
}
func (s *StatsReporter) incCounterHandler(name string) func(...interface{}) {
return func(...interface{}) {
s.incCounter(name)
}
}
func (s *StatsReporter) startTimeRecording(timeKey string) {
s.timersMap.Store(timeKey, time.Now())
}
func (s *StatsReporter) finalizeTimeRecording(timeKey string, statName string) {
startedAtUncasted, ok := s.timersMap.Load(timeKey)
if !ok {
return
}
startedAt, ok := startedAtUncasted.(time.Time)
if !ok {
panic("unable to cast map value to the time.Time")
}
s.recordTimer(statName, time.Since(startedAt))
}
func (s *StatsReporter) incCounter(name string) {
s.Reporter.IncCounter(s.key(name), 1)
}
func (s *StatsReporter) updateGauge(name string, value int64) {
s.Reporter.UpdateGauge(s.key(name), value)
}
func (s *StatsReporter) recordTimer(name string, duration time.Duration) {
s.Reporter.RecordTimer(s.key(name), duration)
}
func (s *StatsReporter) key(name string) string {
return strings.Join([]string{s.Prefix, name}, ".")
}