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clickhouse.go
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clickhouse.go
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// Copyright 2021 iLogtail Authors
//
// Licensed 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 subscriber
import (
"context"
"encoding/json"
"errors"
"fmt"
"net"
"strings"
"time"
"github.com/ClickHouse/clickhouse-go/v2"
"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
"github.com/alibaba/ilogtail/pkg/doc"
"github.com/alibaba/ilogtail/pkg/logger"
"github.com/alibaba/ilogtail/pkg/protocol"
"github.com/mitchellh/mapstructure"
)
const clickHouseName = "clickhouse"
const clickhouseQuerySQL = "select _timestamp,_log from `%s`.`ilogtail_%s_buffer` where _timestamp > %v order by _timestamp"
type ClickHouseSubscriber struct {
Address string `mapstructure:"address" comment:"the clickhouse address"`
Username string `mapstructure:"username" comment:"the clickhouse username"`
Password string `mapstructure:"password" comment:"the clickhouse password"`
Database string `mapstructure:"database" comment:"the clickhouse database name to query from"`
Table string `mapstructure:"table" comment:"the clickhouse table name to query from"`
QueryIntervalMs int `mapstructure:"query_interval_ms" comment:"interval between queries select upserts records from clickhouse"`
CreateTable bool `mapstructure:"create_db" comment:"if create the database, default is true"`
client driver.Conn
lastTimestamp int64
channel chan *protocol.LogGroup
stopCh chan struct{}
}
func (i *ClickHouseSubscriber) Name() string {
return clickHouseName
}
func (i *ClickHouseSubscriber) Description() string {
return "this's a clickhouse subscriber, which will query inserted records from clickhouse periodically."
}
func (i *ClickHouseSubscriber) Start() error {
host, err := TryReplacePhysicalAddress(i.Address)
if err != nil {
return err
}
host = strings.ReplaceAll(host, "http://", "")
conn, err := clickhouse.Open(&clickhouse.Options{
Addr: []string{host},
Auth: clickhouse.Auth{
Database: i.Database,
},
DialContext: func(ctx context.Context, addr string) (net.Conn, error) {
var d net.Dialer
return d.DialContext(ctx, "tcp", addr)
},
Settings: clickhouse.Settings{
"max_execution_time": 60,
},
Compression: &clickhouse.Compression{
Method: clickhouse.CompressionLZ4,
},
DialTimeout: time.Duration(10) * time.Second,
MaxOpenConns: 5,
MaxIdleConns: 5,
ConnMaxLifetime: time.Duration(10) * time.Minute,
ConnOpenStrategy: clickhouse.ConnOpenInOrder,
BlockBufferSize: 10,
})
if err != nil {
logger.Warningf(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "failed to create clickhouse conn, host %, err: %s", host, err)
return err
}
i.client = conn
go i.runQueryRecordsTask()
return nil
}
func (i *ClickHouseSubscriber) Stop() {
close(i.stopCh)
}
func (i *ClickHouseSubscriber) SubscribeChan() <-chan *protocol.LogGroup {
return i.channel
}
func (i *ClickHouseSubscriber) FlusherConfig() string {
return ""
}
func (i *ClickHouseSubscriber) runQueryRecordsTask() {
for {
select {
case <-i.stopCh:
close(i.channel)
return
case <-time.After(time.Duration(i.QueryIntervalMs) * time.Millisecond):
logGroup, maxTimestamp, err := i.queryRecords()
if err != nil {
logger.Warning(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "err", err)
continue
}
logger.Debugf(context.Background(), "subscriber get new logs maxTimestamp: %d, count: %v", maxTimestamp, len(logGroup.Logs))
i.channel <- logGroup
if maxTimestamp > i.lastTimestamp {
i.lastTimestamp = maxTimestamp
}
}
}
}
func (i *ClickHouseSubscriber) queryRecords() (logGroup *protocol.LogGroup, maxTimestamp int64, err error) {
logGroup = &protocol.LogGroup{
Logs: []*protocol.Log{},
}
s := fmt.Sprintf(clickhouseQuerySQL, i.Database, i.Table, i.lastTimestamp)
rows, err := i.client.Query(context.Background(), s)
if err != nil {
logger.Warning(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "err", err)
return
}
logger.Debug(context.Background(), "sql", s)
type logContent struct {
Contents struct {
Index string `json:"Index"`
Name string `json:"_name"`
Value string `json:"_value"`
} `json:"contents"`
Tags struct {
HostIP string `json:"host.ip"`
HostName string `json:"host.name"`
} `json:"tags"`
Time int `json:"time"`
}
defer func() { _ = rows.Close() }()
for rows.Next() {
var (
t int64
l string
)
if err = rows.Scan(&t, &l); err != nil {
logger.Warning(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "failed to read clickhouse data, err", err)
return
}
log := &protocol.Log{}
lc := logContent{}
if err = json.Unmarshal([]byte(l), &lc); err != nil {
logger.Warning(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "failed to unmarshal data, err", err)
return
}
log.Contents = append(log.Contents, &protocol.Log_Content{
Key: "_name",
Value: lc.Contents.Name,
})
log.Contents = append(log.Contents, &protocol.Log_Content{
Key: "_value",
Value: lc.Contents.Value,
})
logGroup.Logs = append(logGroup.Logs, log)
}
return
}
func init() {
RegisterCreator(clickHouseName, func(spec map[string]interface{}) (Subscriber, error) {
i := &ClickHouseSubscriber{
CreateTable: true,
}
if err := mapstructure.Decode(spec, i); err != nil {
return nil, err
}
if i.Address == "" {
return nil, errors.New("addr must not be empty")
}
if i.Database == "" {
return nil, errors.New("database must not be empty")
}
if i.Table == "" {
return nil, errors.New("table must no be empty")
}
if i.QueryIntervalMs <= 0 {
i.QueryIntervalMs = 1000
}
i.channel = make(chan *protocol.LogGroup, 10)
i.stopCh = make(chan struct{})
return i, nil
})
doc.Register("subscriber", clickHouseName, new(ClickHouseSubscriber))
}