forked from mateusg/shield
/
redis.go
267 lines (239 loc) · 5.36 KB
/
redis.go
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package shield
import (
"github.com/garyburd/redigo/redis"
"log"
"strconv"
"time"
)
type RedisStore struct {
pool *redis.Pool
addr string
password string
sumKey string
classKey string
classesKey string
logger *log.Logger
prefix string
}
func NewRedisStore(addr, password string, logger *log.Logger, prefix string) Store {
return &RedisStore{
addr: addr,
password: password,
sumKey: "shield:sum",
classKey: "shield:class",
classesKey: "shield:classes",
logger: logger,
prefix: prefix,
}
}
func (rs *RedisStore) GetPool(server, password string) (*redis.Pool, error) {
if rs.pool == nil {
rs.pool = &redis.Pool{
MaxIdle: 3,
MaxActive: 200,
IdleTimeout: 20 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", server)
if err != nil {
return nil, err
}
if password != "" {
if _, err := c.Do("AUTH", password); err != nil {
c.Close()
return nil, err
}
}
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
}
return rs.pool, nil
}
func (rs *RedisStore) conn() (c redis.Conn, err error) {
pool, err := rs.GetPool(rs.addr, rs.password)
if err != nil {
return nil, err
}
c = pool.Get()
if rs.logger != nil {
c = redis.NewLoggingConn(c, rs.logger, rs.prefix)
}
return c, nil
}
func (rs *RedisStore) Classes() (a []string, err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
classes, err := redis.Strings(c.Do("SMEMBERS", rs.classesKey))
if err != nil {
return
}
for _, v := range classes {
a = append(a, string(v))
}
return
}
func (rs *RedisStore) AddClass(class string) (err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
if class == "" {
panic("invalid class: " + class)
}
_, err = c.Do("SADD", rs.classesKey, class)
return err
}
func (rs *RedisStore) ClassWordCounts(class string, words []string) (mc map[string]int64, err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
c.Send("MULTI")
key := rs.classKey + ":" + class
args := make([]interface{}, 0, len(words)+1)
args = append(args, key)
for _, v := range words {
args = append(args, v)
}
c.Send("HMGET", args...)
values, err := redis.Values(c.Do("EXEC"))
if err != nil {
return
}
if len(values) > 0 {
if x, ok := values[0].([]interface{}); ok {
values = x
}
}
var i int64
mc = make(map[string]int64)
for len(values) > 0 {
var count int64
values, err = redis.Scan(values, &count)
if err != nil {
return
}
mc[words[i]] = count
i++
}
return
}
func (rs *RedisStore) IncrementClassWordCounts(m map[string]map[string]int64) (err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
type tuple struct {
word string
d int64
}
decrTuples := make(map[string][]*tuple, len(m))
// Apply only positive increments
c.Send("MULTI")
for class, words := range m {
for word, d := range words {
if d > 0 {
c.Send("HINCRBY", rs.classKey+":"+class, word, d)
c.Send("HINCRBY", rs.sumKey, class, d)
} else {
decrTuples[class] = append(decrTuples[class], &tuple{
word: word,
d: d,
})
}
}
}
_, err = redis.Values(c.Do("EXEC"))
if err != nil {
return
}
// If we decrement something, we have to check if we are
// about to drop below 0 and adjust the value accordingly.
//
// TODO: This isn't terribly performant because we have to
// to 2 trips per value, try to optimize some time.
//
for class, paths := range decrTuples {
key := rs.classKey + ":" + class
// Build HMGET params
hmget := make([]interface{}, 0, len(paths))
hmget = append(hmget, key)
for _, path := range paths {
hmget = append(hmget, path.word)
}
values, err2 := redis.Strings(c.Do("HMGET", hmget...))
if err2 != nil {
return
}
c.Send("MULTI")
for i, v := range values {
path := paths[i]
x, err2 := strconv.ParseInt(v, 10, 64)
if err2 != nil {
panic(err2)
}
if x != 0 {
d := path.d
if (x + d) < 0 {
d = x * -1
}
c.Send("HINCRBY", key, path.word, d)
c.Send("HINCRBY", rs.sumKey, class, d)
}
}
_, err2 = c.Do("EXEC")
if err2 != nil {
return err2
}
}
return
}
func (rs *RedisStore) TotalClassWordCounts() (m map[string]int64, err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
values, err := redis.Values(c.Do("HGETALL", rs.sumKey))
if err != nil {
return
}
m = make(map[string]int64)
for len(values) > 0 {
var class string
var count int64
values, err = redis.Scan(values, &class, &count)
if err != nil {
return
}
m[class] = count
}
return
}
func (rs *RedisStore) Reset() (err error) {
c, err := rs.conn()
defer c.Close()
if err != nil {
return
}
a, err := redis.Strings(c.Do("KEYS", "shield:*"))
if err != nil {
return
}
c.Send("MULTI")
for _, key := range a {
c.Send("DEL", key)
}
_, err = c.Do("EXEC")
return
}