/
clickhouse.go
164 lines (137 loc) · 3.3 KB
/
clickhouse.go
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/*
* @author Viet Tran <viettranx@gmail.com>
* @copyright 2020 200lab <core@200lab.io>
* @license Apache-2.0
*/
package sdkclickhouse
import (
"flag"
"github.com/200Lab-Education/go-sdk/logger"
_ "github.com/ClickHouse/clickhouse-go"
"github.com/jmoiron/sqlx"
"sync"
"time"
)
const retryCount = 10
type CHDBOpt struct {
ChUri string
Prefix string
PingInterval int // in seconds
}
type clickhouseDB struct {
name string
logger logger.Logger
session *sqlx.DB
isRunning bool
once *sync.Once
*CHDBOpt
}
func NewClickHouseDB(name, prefix string) *clickhouseDB {
return &clickhouseDB{
CHDBOpt: &CHDBOpt{
Prefix: prefix,
},
name: name,
isRunning: false,
once: new(sync.Once),
}
}
func (chDB *clickhouseDB) GetPrefix() string {
return chDB.Prefix
}
func (chDB *clickhouseDB) Name() string {
return chDB.name
}
func (chDB *clickhouseDB) InitFlags() {
prefix := chDB.Prefix
if chDB.Prefix != "" {
prefix += "-"
}
flag.StringVar(&chDB.ChUri, prefix+"clickhouse-uri", "", "ClickHouse connection-string. Ex: tcp://host1:9000?username=user&password=qwerty&database=clicks")
flag.IntVar(&chDB.PingInterval, prefix+"clickhouse-ping-interval", 5, "ClickHouse ping check interval")
}
func (chDB *clickhouseDB) isDisabled() bool {
return chDB.ChUri == ""
}
func (chDB *clickhouseDB) Configure() error {
if chDB.isDisabled() || chDB.isRunning {
return nil
}
chDB.logger = logger.GetCurrent().GetLogger(chDB.name)
chDB.logger.Info("Connect to ClickHouse at ", chDB.ChUri, " ...")
var err error
chDB.session, err = chDB.getConnWithRetry()
if err != nil {
chDB.logger.Error("Error connect to ClickHouse at ", chDB.ChUri, ". ", err.Error())
return err
}
chDB.isRunning = true
return nil
}
func (chDB *clickhouseDB) Cleanup() {
if chDB.isDisabled() {
return
}
if chDB.session != nil {
_ = chDB.session.Close()
}
}
func (chDB *clickhouseDB) Run() error {
return chDB.Configure()
}
func (chDB *clickhouseDB) Stop() <-chan bool {
if chDB.session != nil {
_ = chDB.session.Close()
}
chDB.isRunning = false
c := make(chan bool)
go func() { c <- true }()
return c
}
func (chDB *clickhouseDB) Get() interface{} {
chDB.once.Do(func() {
if !chDB.isRunning && !chDB.isDisabled() {
if db, err := chDB.getConnWithRetry(); err == nil {
chDB.session = db
chDB.isRunning = true
} else {
chDB.logger.Fatalf("%s connection cannot reconnect\n", chDB.name)
}
}
})
if chDB.session == nil {
return nil
}
return chDB.session
}
func (chDB *clickhouseDB) getConnWithRetry() (*sqlx.DB, error) {
db, err := sqlx.Connect("clickhouse", chDB.ChUri)
if err != nil {
for {
time.Sleep(time.Second * 1)
chDB.logger.Errorf("Retry to connect %s.\n", chDB.name)
db, err = sqlx.Connect("clickhouse", chDB.ChUri)
if err == nil {
go chDB.reconnectIfNeeded()
break
}
}
} else {
go chDB.reconnectIfNeeded()
}
return db, err
}
func (chDB *clickhouseDB) reconnectIfNeeded() {
conn := chDB.session
for {
if err := conn.Ping(); err != nil {
_ = conn.Close()
chDB.logger.Errorf("%s connection is gone, try to reconnect\n", chDB.name)
chDB.isRunning = false
chDB.once = new(sync.Once)
_ = chDB.Get().(*sqlx.DB).Close()
return
}
time.Sleep(time.Second * time.Duration(chDB.PingInterval))
}
}