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server.go
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server.go
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package main
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"os"
"os/signal"
"strconv"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/rs/zerolog/log"
)
// defaults
const (
colour = "blue"
leftColour = "grey"
style = "flat"
text = "Visitors"
logo = "" // https://simpleicons.org/
logoColour = "white"
DEFAULT_SHIELDS = "https://img.shields.io"
)
var SHIELDS_URL = GetENV("SHIELDS_URL", DEFAULT_SHIELDS)
var badgeErrorCount = 0 // TODO: verify there isn't a race condition on this
var port = GetENV("PORT", "8080")
var key = GetENV("KEY", "guess_what")
var startTime time.Time
var processedBadges int64 = 0
// Visitor Badge URL Format: /badge?page_id=<key>
func main() {
debug := false
if strings.EqualFold(GetENV("DEBUG", ""), "enabled") {
debug = true
log.Debug().Msg("Enabled Debug Mode.")
}
maintenance := false
if strings.EqualFold(GetENV("MAINTENANCE", ""), "enabled") {
maintenance = true
log.Info().Msg("Enabled Maintenance Mode.")
}
// configure logging
configureLogger(debug)
ConnectRedis()
r := mux.NewRouter()
server := &http.Server{
Handler: r,
Addr: "0.0.0.0:" + port,
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
IdleTimeout: 60 * time.Second,
}
log.Info().Msg("Starting Visitor Badge Reloaded server")
// TODO: DEFAULT_*{COLOUR,STYLE,TEXT,LOGO}
log.Info().Msgf("Key is set to `%s`", key)
r.HandleFunc("/", getWebsite).Methods("GET")
r.HandleFunc("/index.html", getWebsite).Methods("GET")
r.HandleFunc("/ping", getPing).Methods("GET")
r.HandleFunc("/status", getStatus).Methods("GET")
r.HandleFunc("/badge", getBadge).Methods("GET")
// TODO: add auth middleware
r.HandleFunc("/health", getHealth).Methods("GET")
r.HandleFunc("/healthz", getHealth).Methods("GET")
if maintenance {
r.HandleFunc("/rec", getRec).Methods("GET")
}
r.Use(loggingMiddleware)
log.Info().Msg("Configuring cache")
startTime = time.Now()
// Run our server in a goroutine so that it doesn't block.
go func() {
if err := server.ListenAndServe(); err != nil {
logError(err)
}
}()
c := make(chan os.Signal, 1)
// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C)
// SIGKILL, SIGQUIT or SIGTERM (Ctrl+/) will not be caught.
signal.Notify(c, os.Interrupt)
// Block until we receive our signal.
<-c
wait := 15 * time.Second
// Create a deadline to wait for.
ctx, cancel := context.WithTimeout(context.Background(), wait)
defer cancel()
// Doesn't block if no connections, but will otherwise wait
// until the timeout deadline.
server.Shutdown(ctx)
// Optionally, you could run srv.Shutdown in a goroutine and block on
// <-ctx.Done() if your application should wait for other services
// to finalize based on context cancellation.
log.Info().Msg("shutting down...")
os.Exit(0)
}
func getBadge(w http.ResponseWriter, r *http.Request) {
page := qryParam("page_id", r, "")
if page == "" {
return
}
// TODO: time query speed
log.Info().Str("page", page).Msg("Look up")
hash := getHash(page)
colour := qryParam("color", r, colour)
labelColour := qryParam("lcolor", r, leftColour)
style := qryParam("style", r, style)
label := qryParam("text", r, text)
logo := qryParam("logo", r, logo)
logoColour := qryParam("logoColor", r, logoColour)
hit := true
hit_qry := qryParam("hit", r, "")
if len(hit_qry) > 0 && (hit_qry != "true" && hit_qry != "yes") {
hit = false
}
// TODO: DEPRECATED
useCache := false
if len(qryParam("cache", r, "")) > 0 {
useCache = true
}
var cnt string
if hit {
cnt = updateCounter(useCache, hash)
} else {
cnt = GetHash(hash)
}
custom := qryParam("custom", r, "")
if len(custom) > 0 {
escaped, _ := url.QueryUnescape(custom)
cnt = strings.Replace(
escaped,
"CNT", cnt, 1)
log.Info().Msg(cnt)
}
badge := generateBadge(SHIELDS_URL,
BadgeOptions{
Label: label,
Text: cnt,
Colour: colour,
LabelColour: labelColour,
Style: style,
Logo: logo,
LogoColour: logoColour,
Hit: hit,
})
date := time.Now().Add(time.Minute * -10).Format(http.TimeFormat)
expiry := date
if len(qryParam("unique", r, "")) > 0 {
expiry = time.Now().Add(time.Minute * 10).Format(http.TimeFormat)
} else {
w.Header().Set("Cache-Control", "no-cache,max-age=0")
}
w.Header().Set("Content-Type", "image/svg+xml")
w.Header().Set("Date", date)
w.Header().Set("Expires", expiry)
w.Write(badge)
log.Info().Str("page", page).Str("views", cnt).Msg("Generated badge")
}
func getHealth(w http.ResponseWriter, r *http.Request) {
// TODO: do health checks with redis and shields.io
return
}
func getRec(w http.ResponseWriter, r *http.Request) {
page := qryParam("page_id", r, "")
if page == "" {
return
}
cnt, err := strconv.ParseInt(qryParam("count", r, colour), 10, 64)
if err != nil {
return
}
hash := getHash(page)
res := IncrHashBy(hash, cnt)
log.Info().Str("page", page).Int64("old_count", cnt).Int64("views", res).Msg("Recovered badge")
}
func getWebsite(w http.ResponseWriter, r *http.Request) {
// fmt.Fprintf(w, "A website is currently unavailable :(")
http.Redirect(w, r, "https://github.com/Nathan13888/VisitorBadgeReloaded", http.StatusTemporaryRedirect)
}
func getPing(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "PONG!!! Refer to /status for more in-depth information.")
}
func getStatus(w http.ResponseWriter, r *http.Request) {
// TODO: include redis
res := StatusResponse{
ProcessedRequests: processedBadges,
Uptime: int64(time.Since(startTime).Seconds()),
CodeRepository: "https://github.com/Nathan13888/VisitorBadgeReloaded",
RedisStatus: "TBI",
Version: BuildVersion,
// TODO: more redis fields
}
json.NewEncoder(w).Encode(res)
}