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// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package clickhouse
import (
"context"
"fmt"
"time"
"github.com/ClickHouse/clickhouse-go/v2/lib/proto"
)
// Connection::ping
// https://github.com/ClickHouse/ClickHouse/blob/master/src/Client/Connection.cpp
func (c *connect) ping(ctx context.Context) (err error) {
// set a read deadline - alternative to context.Read operation will fail if no data is received after deadline.
c.conn.SetReadDeadline(time.Now().Add(c.readTimeout))
defer c.conn.SetReadDeadline(time.Time{})
// context level deadlines override any read deadline
if deadline, ok := ctx.Deadline(); ok {
c.conn.SetDeadline(deadline)
defer c.conn.SetDeadline(time.Time{})
}
c.debugf("[ping] -> ping")
c.buffer.PutByte(proto.ClientPing)
if err := c.flush(); err != nil {
return err
}
var packet byte
for {
if packet, err = c.reader.ReadByte(); err != nil {
return err
}
switch packet {
case proto.ServerException:
return c.exception()
case proto.ServerProgress:
if _, err = c.progress(); err != nil {
return err
}
case proto.ServerPong:
c.debugf("[ping] <- pong")
return nil
default:
return fmt.Errorf("unexpected packet %d", packet)
}
}
}
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