161 lines
3.3 KiB
Go
161 lines
3.3 KiB
Go
package main
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import (
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"fmt"
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"time"
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"github.com/gomodule/redigo/redis"
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)
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var globalPool *redis.Pool
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const lastvaluesPrefix string = "lastvalues:"
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const devPrefix string = "dev:"
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func newPool() *redis.Pool {
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return &redis.Pool{
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// Maximum number of idle connections in the pool.
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MaxIdle: 80,
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// max number of connections
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MaxActive: 12000,
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// Dial is an application supplied function for creating and
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// configuring a connection.
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Dial: func() (redis.Conn, error) {
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c, err := redis.Dial("tcp", ":6379")
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if err != nil {
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panic(err.Error())
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}
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return c, err
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},
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}
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}
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// ping tests connectivity for redis (PONG should be returned)
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func ping(c redis.Conn) error {
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// Send PING command to Redis
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// PING command returns a Redis "Simple String"
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// Use redis.String to convert the interface type to string
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_, err := redis.String(c.Do("PING"))
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if err != nil {
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return err
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}
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return nil
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}
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func initDB() {
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// newPool returns a pointer to a redis.Pool
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pool := newPool()
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// get a connection from the globalPool (redis.Conn)
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conn := pool.Get()
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defer conn.Close()
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globalPool = pool
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// wir machen einen Connection Test
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ping(conn)
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addValue("0000000000000000",uint16(time.Now().Unix()));
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}
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func closeDB() {
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globalPool.Close()
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}
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func checkDevAvailable(deveui string) bool {
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conn := globalPool.Get()
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defer conn.Close()
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_, err := redis.String(conn.Do("GET", lastvaluesPrefix + deveui))
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if (err == redis.ErrNil) {
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return true
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} else if err != nil {
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return false
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}
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return false
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}
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func getMaxValue(deveui string) uint16 {
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var res uint16 = 0
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var myvalues []uint16
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conn := globalPool.Get()
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defer conn.Close()
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values, _ := redis.Values(conn.Do("LRANGE", lastvaluesPrefix + deveui, 0, -1))
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if err := redis.ScanSlice(values, &myvalues); err != nil {
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fmt.Println(err)
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return 0
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}
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for _, value := range myvalues {
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if (uint16(value) > res) {
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res = uint16(value)
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}
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}
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return res
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}
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func addValue(deveui string, value uint16) {
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conn := globalPool.Get()
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defer conn.Close()
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_, err := conn.Do("LPUSH", lastvaluesPrefix + deveui, value)
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if err != nil {
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return
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}
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_, err2 := conn.Do("LTRIM", lastvaluesPrefix + deveui, 0, 4)
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if err2 != nil {
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return
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}
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// we set an expiration time of one hour
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_, err3 := conn.Do("EXPIRE", lastvaluesPrefix + deveui, 3600)
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if err3 != nil {
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return
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}
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}
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func getDevAlias(deveui string) string {
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res := deveui
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if deveui == "" {
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return res
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}
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conn := globalPool.Get()
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defer conn.Close()
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alias, err := redis.String(conn.Do("HGET", devPrefix+deveui, "alias"))
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if err == nil {
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res = alias
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} else {
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res = deveui
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}
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return res
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}
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func getSmsnumber(deveui string) string {
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res := ""
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if deveui == "" {
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return res
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}
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conn := globalPool.Get()
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defer conn.Close()
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smsnumber, err := redis.String(conn.Do("HGET", devPrefix+deveui, "smsnumber"))
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if err == nil {
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res = smsnumber
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}
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return res
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}
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