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redis.go
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redis.go
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package main
import (
"encoding/json"
"log"
"sort"
"strconv"
"time"
"github.com/gomodule/redigo/redis"
)
type RedisConfiguration struct {
Host string `yaml:"host"`
Port int `yaml:"port"`
Token string `yaml:"token"`
Connection []redis.Conn // db0 (used for whitelist), db1 (used for groups cache), db2 (used for api spam prevention)
Running []bool // concurrency check
CurrentDatabase int
}
var redisDBCount int = 3
// connect
func (r *RedisConfiguration) connect(rc RedisConfiguration) bool {
if rc.Host == "" || rc.Port == 0 || rc.Token == "" {
log.Print("redis.connect(): no redis database configuration was found")
return false
}
r.Connection = make([]redis.Conn, redisDBCount)
r.Running = make([]bool, redisDBCount)
log.Println("redis.connect(): connecting to redis database '" + rc.Host + ":" + strconv.Itoa(rc.Port) + "'")
for db := 0; db <= (redisDBCount - 1); db++ {
c, err := redis.Dial("tcp", rc.Host+":"+strconv.Itoa(rc.Port))
if err != nil {
log.Printf("redis.connect(): %v ", err)
return false
}
_, err = c.Do("AUTH", rc.Token)
if err != nil {
log.Printf("redis.connect(): %v ", err)
return false
}
_, err = c.Do("SELECT", db)
if err != nil {
log.Fatal("redis.connect():", err)
return false
}
r.Running[db] = false
r.Connection[db] = c
}
go r.keepAlive()
log.Println("redis.connect(): connected")
return true
}
// exec
func (r RedisConfiguration) exec(db int, commandName string, args ...interface{}) (reply interface{}, err error) {
r.wait(db)
r.Running[db] = true
reply, err = r.Connection[db].Do(commandName, args[:]...)
r.Running[db] = false
return reply, err
}
// wait
func (r RedisConfiguration) wait(db int) {
// redigo library doesn't support concurrency so we need to run single commands at a time
for ok := true; ok; ok = r.Running[db] {
// command currently running
}
}
// add ip
func (r RedisConfiguration) addIp(user string, ip string) bool {
_, err := r.exec(0, "SET", user, ip)
if err != nil {
log.Fatal("redis.addIp():", err)
return false
}
// expire this key in x hours
return r.setIpExpiry(user)
}
// set ttl on ip
func (r RedisConfiguration) setIpExpiry(user string) bool {
_, err := r.exec(0, "EXPIRE", user, strconv.Itoa(c.TTL*3600))
if err != nil {
log.Fatal("redis.setIpExpiry():", err)
return false
}
return true
}
// delete ip
func (r RedisConfiguration) deleteIp(user string) bool {
_, err := r.exec(0, "DEL", user)
if err != nil {
log.Fatal("redis.deleteIp():", err)
return false
}
return true
}
// get whitelist
func (r RedisConfiguration) getWhitelist() map[string]string {
wl := make(map[string]string)
redisResponse1 := time.Now()
keysI, err := redis.Values(r.exec(0, "KEYS", "*"))
if err != nil {
log.Fatal("redis.getWhitelist(): ", err)
}
if len(keysI) == 0 {
return wl
}
values, err := redis.Strings(r.exec(0, "MGET", keysI[:]...))
if err != nil {
log.Fatal("redis.getWhitelist(): ", err)
}
keys, err := redis.Strings(keysI, err)
if err != nil {
log.Fatal("redis.getWhitelist(): ", err)
}
for index, key := range keys {
ip := values[index]
wl[key] = ip
}
log.Println("redis.getWhitelist(): ## current ip whitelist ##")
sort.Strings(keys)
for _, key := range keys {
log.Println("redis.getWhitelist(): " + key + " : " + wl[key])
}
log.Println("redis.getWhitelist(): ## ##")
redisResponse2 := time.Now()
log.Println("redis.getWhitelist(): response time:", redisResponse2.Sub(redisResponse1))
return wl
}
// add group
func (r RedisConfiguration) addGroups(user string, groups []string) bool {
jsonGroups, err := json.Marshal(groups)
if err != nil {
log.Print("redis.addGroups():", err)
return false
}
_, err = r.exec(1, "SET", user, jsonGroups)
if err != nil {
log.Fatal("redis.addGroups():", err)
return false
}
// expire this key in x hours
return r.setGroupExpiry(user)
}
// set group expiry
func (r RedisConfiguration) setGroupExpiry(user string) bool {
_, err := r.exec(1, "EXPIRE", user, strconv.Itoa(c.TTL*3600+10))
if err != nil {
log.Fatal("redis.setGroupExpiry():", err)
return false
}
return true
}
// get groups
func (r RedisConfiguration) getGroups(user string) []string {
var g []string
redisResponse1 := time.Now()
keysI, err := redis.Values(r.exec(1, "KEYS", user))
if err != nil {
log.Print("redis.getGroups(): ", err)
return g
}
if len(keysI) == 0 {
return g
}
value, err := redis.String(r.exec(1, "GET", user))
if err != nil {
log.Print("redis.getGroups(): ", err)
return g
}
if err := json.Unmarshal([]byte(value), &g); err != nil {
log.Println("redis.getGroups():", err)
return g
}
redisResponse2 := time.Now()
if c.Debug {
log.Println("redis.getGroups(): response time:", redisResponse2.Sub(redisResponse1))
}
return g
}
// user caused api call
func (r RedisConfiguration) apiCalled(user string) {
// all user to cause api calls every 120 seconds
_, err := redis.String(r.exec(2, "SETEX", user, 120, "."))
if err != nil {
log.Fatal("redis.apiCalled():", err)
}
}
// can user call api
func (r RedisConfiguration) canCallApi(user string) bool {
exists, err := redis.Int(r.exec(2, "EXISTS", user))
if err != nil {
log.Fatal("redis.canCallApi():", err)
return false
}
if exists == 1 {
return false
} else {
return true
}
}
// keep alive
func (r RedisConfiguration) keepAlive() {
// run every 5 minutes
for range time.Tick(time.Minute * 5) {
for db := 0; db <= (redisDBCount - 1); db++ {
_, err := redis.Strings(r.exec(db, "KEYS", "1"))
if err != nil {
log.Fatal("redis.keepAlive(): ", err)
}
}
}
}