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package storage
import (
"context"
"fmt"
"net/http"
"net/url"
"slices"
"strings"
"sync"
"time"
"git.anhgelus.world/anhgelus/small-web/backend/log"
)
const IPAddressKey = "ip_address"
type loadRequest struct {
target string
referer string
}
type loaded struct {
data map[string]loadRequest
mu *sync.RWMutex
}
func (l *loaded) Get(ip, target string) (loadRequest, bool) {
l.mu.RLock()
defer l.mu.RUnlock()
val, ok := l.data[ip]
if !ok {
return loadRequest{}, false
}
return val, val.target == target
}
func (l *loaded) Add(ip, referer, target string) {
l.mu.Lock()
defer l.mu.Unlock()
l.data[ip] = loadRequest{referer: referer, target: target}
}
func (l *loaded) Remove(ip, target string) {
if _, ok := l.Get(ip, target); ok {
l.mu.Lock()
defer l.mu.Unlock()
delete(l.data, ip)
}
}
var load = loaded{
data: make(map[string]loadRequest),
mu: new(sync.RWMutex),
}
// using /assets/styles.css to detect if a page is loaded → majority of bots will not load this
const HumanPageLoad = "/assets/styles.css"
func getReferer(r *http.Request, domain string) (string, bool) {
ref := r.Header.Get("Referer")
if len(ref) == 0 {
return "", false
}
refUrl, err := url.Parse(ref)
if err != nil {
return "", false
}
ref = refUrl.Host
if len(ref) == 0 {
return "", false
}
if ref == domain || ref == fmt.Sprintf("localhost:%d", 8000) {
ref = refUrl.Path
if !strings.HasPrefix(ref, "/") {
ref = "/" + ref
}
if ref == r.URL.Path || strings.HasPrefix(ref, "/admin") || ref == "/favicon.ico" {
return ref, false
}
}
return ref, true
}
func UpdateStats(ctx context.Context, r *http.Request, domain string) error {
target := r.URL.Path
if target == HumanPageLoad {
return humanLoad(ctx, r, domain)
}
if strings.HasPrefix(target, "/admin") {
return nil
}
ref, ok := getReferer(r, domain)
if !ok {
return nil
}
ip := ctx.Value(IPAddressKey).(string)
load.Add(ip, ref, target)
go func(ip, target string) {
time.Sleep(5 * time.Second)
load.Remove(ip, target)
}(ip, target)
return nil
}
func humanLoad(ctx context.Context, r *http.Request, domain string) error {
ip := ctx.Value(IPAddressKey).(string)
ref, ok := getReferer(r, domain)
if !ok {
return nil
}
lr, ok := load.Get(ip, ref)
if !ok {
lr.referer = "?"
lr.target = ref
}
db := getDB(ctx)
rows, err := db.QueryContext(ctx, "SELECT id, visit FROM stats WHERE origin = ? AND target = ?", lr.referer, lr.target)
if err != nil {
return err
}
defer func() {
if err == nil {
log.GetLogger(ctx).Debug("stats updated")
load.Remove(ip, lr.target)
}
}()
if !rows.Next() {
_, err = db.ExecContext(ctx, "INSERT INTO stats (origin, target, visit) VALUES (?, ?, 1)", lr.referer, lr.target)
return err
}
var id uint
var nb uint
err = rows.Scan(&id, &nb)
if err != nil {
return err
}
err = rows.Close()
if err != nil {
return err
}
_, err = db.ExecContext(ctx, "UPDATE stats SET visit = ? WHERE id = ?", nb+1, id)
return err
}
type StatsRow struct {
Origin string
Target string
Visit uint
}
const StatsPerPage = 25
func GetStatsRows(ctx context.Context, page uint) ([]StatsRow, error) {
rows, err := getDB(ctx).QueryContext(
ctx,
"SELECT origin, target, visit FROM stats ORDER BY visit DESC LIMIT ? OFFSET ?",
StatsPerPage, (page-1)*StatsPerPage,
)
if err != nil {
return nil, err
}
defer rows.Close()
statRows := make([]StatsRow, StatsPerPage)
var i uint8
for i = 0; rows.Next(); i++ {
var stat StatsRow
err = rows.Scan(&stat.Origin, &stat.Target, &stat.Visit)
if err != nil {
return nil, err
}
statRows[i] = stat
}
if i == 0 {
return nil, nil
}
return statRows[:i], nil
}
func GetUnionStatsRows(ctx context.Context) ([]StatsRow, error) {
rows, err := getDB(ctx).QueryContext(ctx, "SELECT target, visit FROM stats ORDER BY visit DESC")
if err != nil {
return nil, err
}
defer rows.Close()
data := make(map[string]uint)
for rows.Next() {
var stat StatsRow
err = rows.Scan(&stat.Target, &stat.Visit)
if err != nil {
return nil, err
}
if _, ok := data[stat.Target]; !ok {
data[stat.Target] = stat.Visit
} else {
data[stat.Target] += stat.Visit
}
}
var statRows []StatsRow
for k, v := range data {
statRows = append(statRows, StatsRow{
Target: k,
Visit: v,
})
}
slices.SortFunc(statRows, func(a, b StatsRow) int {
return int(b.Visit) - int(a.Visit)
})
return statRows, nil
}
|
