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bootstrap.go
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bootstrap.go
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package clickhouse
import (
"bufio"
"database/sql"
"database/sql/driver"
"fmt"
"io"
"log"
"net/url"
"os"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/ClickHouse/clickhouse-go/lib/binary"
"github.com/ClickHouse/clickhouse-go/lib/data"
"github.com/ClickHouse/clickhouse-go/lib/protocol"
)
const (
// DefaultDatabase when connecting to ClickHouse
DefaultDatabase = "default"
// DefaultUsername when connecting to ClickHouse
DefaultUsername = "default"
// DefaultConnTimeout when connecting to ClickHouse
DefaultConnTimeout = 5 * time.Second
// DefaultReadTimeout when reading query results
DefaultReadTimeout = time.Minute
// DefaultWriteTimeout when sending queries
DefaultWriteTimeout = time.Minute
)
var (
unixtime int64
logOutput io.Writer = os.Stdout
hostname, _ = os.Hostname()
poolInit sync.Once
)
func init() {
sql.Register("clickhouse", &bootstrap{})
go func() {
for tick := time.Tick(time.Second); ; {
select {
case <-tick:
atomic.AddInt64(&unixtime, int64(time.Second))
}
}
}()
}
func now() time.Time {
return time.Unix(0, atomic.LoadInt64(&unixtime))
}
type bootstrap struct{}
func (d *bootstrap) Open(dsn string) (driver.Conn, error) {
return Open(dsn)
}
// SetLogOutput allows to change output of the default logger
func SetLogOutput(output io.Writer) {
logOutput = output
}
// Open the connection
func Open(dsn string) (driver.Conn, error) {
clickhouse, err := open(dsn)
if err != nil {
return nil, err
}
return clickhouse, err
}
func open(dsn string) (*clickhouse, error) {
url, err := url.Parse(dsn)
if err != nil {
return nil, err
}
var (
hosts = []string{url.Host}
query = url.Query()
secure = false
skipVerify = false
tlsConfigName = query.Get("tls_config")
noDelay = true
compress = false
database = query.Get("database")
username = query.Get("username")
password = query.Get("password")
blockSize = 1000000
connTimeout = DefaultConnTimeout
readTimeout = DefaultReadTimeout
writeTimeout = DefaultWriteTimeout
connOpenStrategy = connOpenRandom
)
if len(database) == 0 {
database = DefaultDatabase
}
if len(username) == 0 {
username = DefaultUsername
}
if v, err := strconv.ParseBool(query.Get("no_delay")); err == nil {
noDelay = v
}
tlsConfig := getTLSConfigClone(tlsConfigName)
if tlsConfigName != "" && tlsConfig == nil {
return nil, fmt.Errorf("invalid tls_config - no config registered under name %s", tlsConfigName)
}
secure = tlsConfig != nil
if v, err := strconv.ParseBool(query.Get("secure")); err == nil {
secure = v
}
if v, err := strconv.ParseBool(query.Get("skip_verify")); err == nil {
skipVerify = v
}
if duration, err := strconv.ParseFloat(query.Get("timeout"), 64); err == nil {
connTimeout = time.Duration(duration * float64(time.Second))
}
if duration, err := strconv.ParseFloat(query.Get("read_timeout"), 64); err == nil {
readTimeout = time.Duration(duration * float64(time.Second))
}
if duration, err := strconv.ParseFloat(query.Get("write_timeout"), 64); err == nil {
writeTimeout = time.Duration(duration * float64(time.Second))
}
if size, err := strconv.ParseInt(query.Get("block_size"), 10, 64); err == nil {
blockSize = int(size)
}
if altHosts := strings.Split(query.Get("alt_hosts"), ","); len(altHosts) != 0 {
for _, host := range altHosts {
if len(host) != 0 {
hosts = append(hosts, host)
}
}
}
switch query.Get("connection_open_strategy") {
case "random":
connOpenStrategy = connOpenRandom
case "in_order":
connOpenStrategy = connOpenInOrder
case "time_random":
connOpenStrategy = connOpenTimeRandom
}
settings, err := makeQuerySettings(query)
if err != nil {
return nil, err
}
if v, err := strconv.ParseBool(query.Get("compress")); err == nil {
compress = v
}
var (
ch = clickhouse{
logf: func(string, ...interface{}) {},
settings: settings,
compress: compress,
blockSize: blockSize,
ServerInfo: data.ServerInfo{
Timezone: time.Local,
},
}
logger = log.New(logOutput, "[clickhouse]", 0)
)
if debug, err := strconv.ParseBool(url.Query().Get("debug")); err == nil && debug {
ch.logf = logger.Printf
}
ch.logf("host(s)=%s, database=%s, username=%s",
strings.Join(hosts, ", "),
database,
username,
)
options := connOptions{
secure: secure,
tlsConfig: tlsConfig,
skipVerify: skipVerify,
hosts: hosts,
connTimeout: connTimeout,
readTimeout: readTimeout,
writeTimeout: writeTimeout,
noDelay: noDelay,
openStrategy: connOpenStrategy,
logf: ch.logf,
}
if ch.conn, err = dial(options); err != nil {
return nil, err
}
logger.SetPrefix(fmt.Sprintf("[clickhouse][connect=%d]", ch.conn.ident))
ch.buffer = bufio.NewWriter(ch.conn)
ch.decoder = binary.NewDecoderWithCompress(ch.conn)
ch.encoder = binary.NewEncoderWithCompress(ch.buffer)
if err := ch.hello(database, username, password); err != nil {
ch.conn.Close()
return nil, err
}
return &ch, nil
}
func (ch *clickhouse) hello(database, username, password string) error {
ch.logf("[hello] -> %s", ch.ClientInfo)
{
ch.encoder.Uvarint(protocol.ClientHello)
if err := ch.ClientInfo.Write(ch.encoder); err != nil {
return err
}
{
ch.encoder.String(database)
ch.encoder.String(username)
ch.encoder.String(password)
}
if err := ch.encoder.Flush(); err != nil {
return err
}
}
{
packet, err := ch.decoder.Uvarint()
if err != nil {
return err
}
switch packet {
case protocol.ServerException:
return ch.exception()
case protocol.ServerHello:
if err := ch.ServerInfo.Read(ch.decoder); err != nil {
return err
}
case protocol.ServerEndOfStream:
ch.logf("[bootstrap] <- end of stream")
return nil
default:
return fmt.Errorf("[hello] unexpected packet [%d] from server", packet)
}
}
ch.logf("[hello] <- %s", ch.ServerInfo)
return nil
}