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conn_handshake.go
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/
conn_handshake.go
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package clickhouse
import (
"fmt"
"time"
"github.com/ClickHouse/clickhouse-go/v2/lib/proto"
)
func (c *connect) handshake(database, username, password string) error {
c.debugf("[handshake] -> %s", proto.ClientHandshake{})
c.conn.SetDeadline(time.Now().Add(c.opt.DialTimeout))
defer c.conn.SetDeadline(time.Time{})
{
c.encoder.Byte(proto.ClientHello)
if err := (&proto.ClientHandshake{}).Encode(c.encoder); err != nil {
return err
}
{
if err := c.encoder.String(database); err != nil {
return err
}
if err := c.encoder.String(username); err != nil {
return err
}
if err := c.encoder.String(password); err != nil {
return err
}
}
if err := c.encoder.Flush(); err != nil {
return err
}
}
{
packet, err := c.decoder.ReadByte()
if err != nil {
return err
}
switch packet {
case proto.ServerException:
return c.exception()
case proto.ServerHello:
if err := c.server.Decode(c.decoder); err != nil {
return err
}
case proto.ServerEndOfStream:
c.debugf("[handshake] <- end of stream")
return nil
default:
return fmt.Errorf("[handshake] unexpected packet [%d] from server", packet)
}
}
if c.server.Revision < proto.DBMS_MIN_REVISION_WITH_CLIENT_INFO {
return ErrUnsupportedServerRevision
}
if c.revision > c.server.Revision {
c.revision = c.server.Revision
c.debugf("[handshake] downgrade client proto")
}
c.debugf("[handshake] <- %s", c.server)
return nil
}