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client.go
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client.go
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package clickhouse_20200328
import (
"context"
"database/sql"
"errors"
"fmt"
_ "github.com/ClickHouse/clickhouse-go"
"github.com/elastic/beats/v7/libbeat/logp"
"github.com/elastic/beats/v7/libbeat/outputs"
"github.com/vjeantet/grok"
"strings"
"sync"
"time"
)
type client struct {
log *logp.Logger
observer outputs.Observer
url string
table string
columns []string
grokStr string
grokField string
retryInterval int
connect *sql.DB
mutex sync.Mutex
skipUnexpectedTypeRow bool
g *grok.Grok
}
func newClient(
observer outputs.Observer,
url string,
table string,
columns []string,
grokStr string,
grokField string,
retryInterval int,
skipUnexpectedTypeRow bool,
) *client {
client := &client{
log: logp.NewLogger("clickhouse"),
observer: observer,
url: url,
table: table,
columns: columns,
grokStr: grokStr,
grokField: grokField,
retryInterval: retryInterval,
skipUnexpectedTypeRow: skipUnexpectedTypeRow,
}
if grokStr != "" && grokField != "" {
g, err := grok.NewWithConfig(&grok.Config{NamedCapturesOnly: true})
if err != nil {
client.log.Errorf("grok compile error: {%+v}", err)
return nil
}
client.g = g
}
return client
}
func (c *client) Connect() error {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.connect != nil {
c.log.Infof("connection reuse")
return nil
}
connect, err := sql.Open("clickhouse", c.url)
if err != nil {
c.connect = nil
c.log.Errorf("open clickhouse connection fail: {%+v}", err)
return err
}
if err = connect.Ping(); err != nil {
c.connect = nil
c.log.Errorf("ping clickhouse fail: {%+v}", err)
return err
}
c.log.Infof("new connection")
c.connect = connect
return err
}
func (c *client) Close() error {
c.log.Infof("close connection")
return c.connect.Close()
}
func (c *client) Publish(_ context.Context, batch publisher.Batch) error {
if c == nil {
panic("no client")
}
if batch == nil {
panic("no batch")
}
events := batch.Events()
c.observer.NewBatch(len(events))
rest, err := c.publish(events)
if rest != nil {
c.observer.Failed(len(rest))
c.sleepBeforeRetry(err)
batch.RetryEvents(rest)
return err
}
batch.ACK()
return err
}
func (c *client) String() string {
return "clickhouse(" + c.url + ")"
}
// publish events
func (c *client) publish(data []publisher.Event) ([]publisher.Event, error) {
ctx := context.Background()
formatRows := make([][]interface{}, 0)
// group events
okFormatEvents, failFormatEvents, formatRows := extractDataFromEvent(c.log, formatRows, data, c.columns, c.grokStr, c.grokField, c.g)
c.log.Infof("[check data format] ok-format-events: %d, fail-format-events: %d, format-rows: %d", len(okFormatEvents), len(failFormatEvents), len(formatRows))
if len(okFormatEvents) == 0 {
return failFormatEvents, errors.New("[check data format] all events match field fail")
}
tx, err := c.connect.BeginTx(ctx, nil)
if err != nil {
c.log.Errorf("[transaction] begin fail: {%+v}", err)
return data, err
}
stmt, err := tx.PrepareContext(ctx, generateSql(c.table, c.columns))
if err != nil {
c.log.Errorf("[transaction] stmt prepare fail: {%+v}", err)
return data, err
}
// defer
defer func(stmt *sql.Stmt) {
err = stmt.Close()
if err != nil {
c.log.Errorf("[transaction] stmt close fail: {%+v}", err)
}
}(stmt)
var lastErr error
var okExecEvents, failExecEvents []publisher.Event
for k, row := range formatRows {
_, err = stmt.ExecContext(ctx, row...)
if err != nil {
c.log.Errorf("[transaction] stmt exec fail: {%+v}", err)
lastErr = err
// fail
failExecEvents = append(failExecEvents, okFormatEvents[k])
continue
}
// ok
okExecEvents = append(okExecEvents, okFormatEvents[k])
}
c.log.Infof("[check data type] ok-exec-events: %d, fail-exec-events: %d", len(okExecEvents), len(failExecEvents))
// happen error, skip unexpected type row
if lastErr != nil && c.skipUnexpectedTypeRow {
// rollback
err = tx.Rollback()
if err != nil {
return nil, err
}
if len(okExecEvents) > 0 {
c.log.Infof("[skip unexpected type row] recall publish, ok-exec-events: %d, fail-exec-events: %d", len(okExecEvents), len(failExecEvents))
_, err = c.publish(okExecEvents)
if err != nil {
return nil, err
}
}
return nil, nil
}
if err = tx.Commit(); err != nil {
err = tx.Rollback()
if err != nil {
return nil, err
}
c.log.Errorf("[transaction] commit failed, ok-exec-events: %d, fail-exec-events: %d, err: {%+v}", len(okExecEvents), len(failExecEvents), err)
return data, err
}
c.log.Infof("[transaction] commit successed, ok-exec-events: %d, fail-exec-events: %d", len(okExecEvents), len(failExecEvents))
return failExecEvents, lastErr
}
// sleepBeforeRetry sleep before retry
func (c *client) sleepBeforeRetry(err error) {
c.log.Errorf("will sleep for %v seconds because an error occurs: %s", c.retryInterval, err)
time.Sleep(time.Second * time.Duration(c.retryInterval))
}
// generateSql
func generateSql(table string, columns []string) string {
size := len(columns) - 1
var columnStr, valueStr strings.Builder
for i, cl := range columns {
columnStr.WriteString(cl)
valueStr.WriteString("?")
if i < size {
columnStr.WriteString(",")
valueStr.WriteString(",")
}
}
return fmt.Sprint("insert into ", table, " (", columnStr.String(), ") values (", valueStr.String(), ")")
}
// extractDataFromEvent extract data
func extractDataFromEvent(
log *logp.Logger,
to [][]interface{},
data []publisher.Event,
columns []string,
grokStr string,
grokField string,
g *grok.Grok,
) ([]publisher.Event, []publisher.Event, [][]interface{}) {
var okEvents, failEvents []publisher.Event
for _, event := range data {
content := event.Content
var row []interface{}
var err error
if grokField != "" && grokStr != "" {
row, err = matchFieldsGrok(content, columns, grokStr, grokField, g)
} else {
row, err = matchFields(content, columns)
}
if err != nil {
log.Errorf("match field error: {%+v}", err)
// match fail then append fail-events
failEvents = append(failEvents, event)
continue
}
to = append(to, row)
// match successed then append ok-events
okEvents = append(okEvents, event)
}
return okEvents, failEvents, to
}
// matchFields match field format
func matchFields(content beat.Event, columns []string) ([]interface{}, error) {
row := make([]interface{}, 0)
for _, col := range columns {
if _, ok := content.Fields[col]; !ok {
return nil, errors.New("format error")
}
val, err := content.GetValue(col)
if err != nil {
return nil, err
}
row = append(row, val)
}
return row, nil
}
// matchFields match field format with grok
func matchFieldsGrok(content beat.Event, columns []string, grokStr, grokField string, g *grok.Grok) ([]interface{}, error) {
row := make([]interface{}, 0)
values, err := g.Parse(grokStr, content.Fields[grokField].(string))
if err != nil {
return nil, errors.New("grok cannot parse event")
}
for _, col := range columns {
if _, ok := values[col]; !ok {
return nil, errors.New("format error")
}
row = append(row, values[col])
}
return row, nil
}