forked from noise-lab/encore
/
stats.go
148 lines (125 loc) · 4.17 KB
/
stats.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"net/url"
"github.com/rcrowley/go-metrics"
"github.com/sburnett/encore/store"
)
type statsState struct {
CountResultsRequests chan store.CountResultsRequest
ResultsPerDayRequests chan store.ResultsPerDayRequest
ResultsPerCountryRequests chan store.ResultsPerCountryRequest
}
var refererRedirects = metrics.GetOrRegisterCounter("StatsRefererRedirects", nil)
var statsHits = metrics.GetOrRegisterCounter("StatsHits", nil)
var statsTemplateExecutionErrorCount = metrics.GetOrRegisterCounter("StatsTemplateExecutionError", nil)
func NewStatsServer(s store.Store, templatesPath string) http.Handler {
countResultsRequests := make(chan store.CountResultsRequest)
go s.CountResultsForReferrer(countResultsRequests)
resultsPerDayRequests := make(chan store.ResultsPerDayRequest)
go s.ResultsPerDayForReferrer(resultsPerDayRequests)
resultsPerCountryRequests := make(chan store.ResultsPerCountryRequest)
go s.ResultsPerCountryForReferrer(resultsPerCountryRequests)
return &statsState{
CountResultsRequests: countResultsRequests,
ResultsPerDayRequests: resultsPerDayRequests,
ResultsPerCountryRequests: resultsPerCountryRequests,
}
}
func refererRedirect(w http.ResponseWriter, r *http.Request) {
refererRedirects.Inc(1)
var referer string
referers, ok := r.Header["Referer"]
if !ok {
referer = ""
} else {
referer = referers[0]
}
parameters := url.Values{}
parameters.Set("referer", referer)
parameters.Encode()
redirectUrl := url.URL{
Path: "/stats.html",
RawQuery: parameters.Encode(),
}
log.Print(redirectUrl.String())
http.Redirect(w, r, redirectUrl.String(), http.StatusFound)
}
func formatReferer(refererString string) (string, error) {
referer, err := url.ParseRequestURI(refererString)
if err != nil {
invalidRefererCount.Inc(1)
return "", fmt.Errorf("invalid referer")
}
referer.RawQuery = "" // Remove query parameters for robustness.
return referer.String(), nil
}
func countResults(requests chan store.CountResultsRequest, referer string) (int, error) {
request := store.CountResultsRequest{
Referer: referer,
Response: make(chan store.CountResultsResponse),
}
requests <- request
response := <-request.Response
return response.Count, response.Err
}
func resultsPerDay(requests chan store.ResultsPerDayRequest, referer string) (map[string]int, error) {
request := store.ResultsPerDayRequest{
Referer: referer,
Response: make(chan store.ResultsPerDayResponse),
}
requests <- request
response := <-request.Response
return response.Results, response.Err
}
func resultsPerCountry(requests chan store.ResultsPerCountryRequest, referer string) (map[string]int, error) {
request := store.ResultsPerCountryRequest{
Referer: referer,
Response: make(chan store.ResultsPerCountryResponse),
}
requests <- request
response := <-request.Response
return response.Results, response.Err
}
func (state *statsState) ServeHTTP(w http.ResponseWriter, r *http.Request) {
statsHits.Inc(1)
referer := r.URL.Query().Get("referer")
refererString, err := formatReferer(referer)
if err != nil {
log.Printf("error formatting referer: %v", err)
refererString = ""
}
totalResults, err := countResults(state.CountResultsRequests, refererString)
if err != nil {
log.Printf("error counting results for this referer: %s", err)
totalResults = 0
}
perDay, err := resultsPerDay(state.ResultsPerDayRequests, refererString)
if err != nil {
log.Printf("error counting results per day for this referer: %s", err)
perDay = map[string]int{}
}
perCountry, err := resultsPerCountry(state.ResultsPerCountryRequests, refererString)
if err != nil {
log.Printf("error counting results per country for this referer: %s", err)
perCountry = map[string]int{}
}
encoder := json.NewEncoder(w)
if err := encoder.Encode(struct {
Site string
TotalResults int
ResultsPerDay map[string]int
ResultsPerCountry map[string]int
}{
Site: referer,
TotalResults: totalResults,
ResultsPerDay: perDay,
ResultsPerCountry: perCountry,
}); err != nil {
log.Printf("error encoding JSON result: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}