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mysql.go
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mysql.go
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package mysql
import (
"bytes"
"database/sql"
"fmt"
"sort"
"strings"
"sync"
_ "github.com/go-sql-driver/mysql"
"github.com/qiniu/pandora-go-sdk/base/ratelimit"
"github.com/qiniu/logkit/conf"
"github.com/qiniu/logkit/sender"
. "github.com/qiniu/logkit/sender/config"
"github.com/qiniu/logkit/utils/models"
)
const (
defaultMySQLPort = "3306"
)
var bufPool = sync.Pool{
New: func() interface{} { return new(bytes.Buffer) },
}
func init() {
sender.RegisterConstructor(TypeMySQL, NewSender)
}
type dbconn struct {
datasource string
table string
columns []string
queryPrefix string
placeholder string
db *sql.DB
inited bool
}
func (c *dbconn) init(firstData models.Data) error {
if c.inited || len(firstData) == 0 {
return nil
}
var err error
if c.db, err = sql.Open("mysql", c.datasource); err != nil {
return fmt.Errorf("cannot open DSN %q: %v", c.datasource, err)
}
for col := range firstData {
c.columns = append(c.columns, col)
}
sort.Strings(c.columns)
s := strings.Repeat("?,", len(c.columns))
c.placeholder = fmt.Sprintf("(%s)", s[:len(s)-1])
c.queryPrefix = fmt.Sprintf("INSERT INTO %s(%s) VALUES ",
c.table, strings.Join(c.columns, ","))
c.inited = true
return nil
}
func (c *dbconn) write(records []models.Data) error {
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
buf.WriteString(c.queryPrefix)
args := make([]interface{}, 0, len(records)*len(c.columns))
for _, data := range records {
buf.WriteString(c.placeholder)
buf.WriteByte(',')
for _, col := range c.columns {
args = append(args, data[col])
}
}
if buf.Len() > len(c.queryPrefix) {
buf.Truncate(buf.Len() - 1)
}
query := buf.String()
stmt, err := c.db.Prepare(query)
if err != nil {
return fmt.Errorf("prepare query %q: %v", query, err)
}
defer stmt.Close()
if _, err = stmt.Exec(args...); err != nil {
return fmt.Errorf("statement execute: %v", err)
}
return nil
}
func (c *dbconn) close() error {
if c.db != nil {
return c.db.Close()
}
return nil
}
type Sender struct {
c *dbconn
name string
limiter *ratelimit.Limiter
}
func NewSender(conf conf.MapConf) (s sender.Sender, err error) {
defer func() {
if r := recover(); r != nil {
switch v := r.(type) {
case error:
err = v
default:
err = fmt.Errorf("%s", v)
}
}
}()
datasource, err := conf.GetPasswordEnvString(KeyMySQLDataSource)
if err != nil {
return nil, err
}
table, err := conf.GetString(KeyMySQLTable)
if err != nil {
return nil, err
}
name, _ := conf.GetStringOr(KeyName, "")
rate, _ := conf.GetInt64Or(KeyMaxSendRate, -1)
return &Sender{
name: name,
c: &dbconn{
datasource: datasource,
table: table,
},
limiter: ratelimit.NewLimiter(rate),
}, nil
}
func (s *Sender) Send(records []models.Data) error {
if len(records) == 0 {
return nil
}
if err := s.c.init(records[0]); err != nil {
return err
}
s.limiter.Assign(int64(len(records)))
return s.c.write(records)
}
func (s *Sender) Name() string {
return s.name
}
func (s *Sender) Close() error {
s.limiter.Close()
return s.c.close()
}