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connection.go
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connection.go
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package main
import (
"fmt"
"strconv"
"time"
"github.com/gomodule/redigo/redis"
"github.com/newrelic/infra-integrations-sdk/log"
)
type conn interface {
GetInfo() (string, error)
GetConfig() (map[string]string, error)
setKeysType(string, []string, map[string]keyInfo) error
setKeysLength(string, []string, map[string]keyInfo) error
GetRawCustomKeys(map[string][]string) (map[string]map[string]keyInfo, error)
Close()
}
type redisConn struct {
c redis.Conn
}
type keyInfo struct {
keyLength int64
keyType string
}
type configConnectionError struct {
cause error
}
func (c configConnectionError) Error() string {
return "can't execute redis 'CONFIG' command: " + c.cause.Error()
}
func newRedisCon(hostname string, port int, unixSocket string, password string) (conn, error) {
connectTimeout := redis.DialConnectTimeout(time.Second * 5)
readTimeout := redis.DialReadTimeout(time.Second * 5)
writeTimeout := redis.DialWriteTimeout(time.Second * 5)
redisPass := redis.DialPassword(password)
var c redis.Conn
var err error
switch {
case unixSocket != "":
c, err = redis.Dial("unix", unixSocket, connectTimeout, readTimeout, writeTimeout, redisPass)
if err != nil {
return nil, fmt.Errorf("Redis connection through Unix Socket failed, got error: %v", err)
}
log.Debug("Connected to Redis through Unix Socket")
case hostname != "" && port > 0:
URL := hostname + ":" + strconv.Itoa(port)
c, err = redis.Dial("tcp", URL, connectTimeout, readTimeout, writeTimeout, redisPass)
if err != nil {
return nil, fmt.Errorf("Redis connection through TCP failed, got error: %v", err)
}
log.Debug("Connected to Redis through TCP")
default:
return nil, fmt.Errorf("Redis connection failed, cannot connect either through TCP or Unix Socket")
}
return redisConn{c}, nil
}
func (r redisConn) GetInfo() (string, error) {
if err := r.c.Send("INFO"); err != nil {
return "", fmt.Errorf("can't write INFO Redis command: %v", err.Error())
}
if err := r.c.Flush(); err != nil {
return "", fmt.Errorf("can't send INFO Redis command: %v", err.Error())
}
return redis.String(r.c.Receive())
}
func (r redisConn) GetConfig() (map[string]string, error) {
if err := r.c.Send("CONFIG", "GET", "*"); err != nil {
return nil, configConnectionError{cause: err}
}
if err := r.c.Flush(); err != nil {
return nil, configConnectionError{cause: err}
}
return redis.StringMap(r.c.Receive())
}
func (r redisConn) Close() {
r.c.Close()
}
func (r redisConn) setKeysType(db string, keys []string, info map[string]keyInfo) error {
_, err := r.c.Do("SELECT", db)
if err != nil {
return fmt.Errorf("Cannot connect to db: %s, information for keys: %v will not be reported, got error: %v ", db, keys, err)
}
for _, key := range keys {
if err = r.c.Send("TYPE", key); err != nil {
log.Warn("Cannot get a type for key: %s, got error: %v", key, err)
}
}
if err = r.c.Flush(); err != nil {
return fmt.Errorf("Cannot get data for db: %s, got error: %v", db, err)
}
for _, key := range keys {
keyType, err := r.c.Receive()
if err != nil {
log.Warn("For db: %s and key: %s, got error: %v", db, key, err)
continue
}
tmp := info[key]
tmp.keyType = keyType.(string)
info[key] = tmp
}
return nil
}
func (r redisConn) setKeysLength(db string, keys []string, info map[string]keyInfo) error {
_, err := r.c.Do("SELECT", db)
if err != nil {
return fmt.Errorf("Cannot connect to db: %s, information for keys: %v will not be reported, got error: %v ", db, keys, err)
}
for _, key := range keys {
switch info[key].keyType {
case "list":
if err = r.c.Send("LLEN", key); err != nil {
log.Warn("Cannot retrieve a length of the key: %s from db: %s, got error: %v", key, db, err)
}
case "set":
if err = r.c.Send("SCARD", key); err != nil {
log.Warn("Cannot retrieve a length of the key: %s from db: %s, got error: %v", key, db, err)
}
case "zset":
if err = r.c.Send("ZCOUNT", key, "-inf", "+inf"); err != nil {
log.Warn("Cannot retrieve a length of the key: %s from db: %s, got error: %v", key, db, err)
}
case "hash":
if err = r.c.Send("HLEN", key); err != nil {
log.Warn("Cannot retrieve a length of the key: %s from db: %s, got error: %v", key, db, err)
}
case "string":
log.Warn("Key: %s from db: %s is a string type, cannot retrieve a length", key, db)
default:
log.Warn("Unknown type of the key: %s from db: %s, cannot retrieve a length", key, db)
}
}
if err = r.c.Flush(); err != nil {
return fmt.Errorf("Cannot get data for db: %s, got error: %v", db, err)
}
for _, key := range keys {
if info[key].keyType != "string" && info[key].keyType != "none" {
keyLength, err := r.c.Receive()
if err != nil {
log.Warn("For db: %s and key: %s, got error: %v", db, key, err)
continue
}
tmp := info[key]
tmp.keyLength = keyLength.(int64)
info[key] = tmp
} else {
delete(info, key)
}
}
return nil
}
func (r redisConn) GetRawCustomKeys(databaseKeys map[string][]string) (map[string]map[string]keyInfo, error) {
customKeysMetric := make(map[string]map[string]keyInfo)
for db, keys := range databaseKeys {
info := make(map[string]keyInfo)
err := r.setKeysType(db, keys, info)
if err != nil {
return nil, fmt.Errorf("Cannot get type for keys %s from db %s, got err: %v", keys, db, err)
}
err = r.setKeysLength(db, keys, info)
if err != nil {
return nil, fmt.Errorf("Cannot get length for keys %s from db %s, got err: %v", keys, db, err)
}
customKeysMetric["db"+db] = info
}
return customKeysMetric, nil
}