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clickhouse.go
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clickhouse.go
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package clickhouse
import (
"context"
"errors"
"fmt"
"sync/atomic"
"time"
"github.com/ClickHouse/clickhouse-go/v2/lib/column"
"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
"github.com/ClickHouse/clickhouse-go/v2/lib/proto"
)
type (
Date time.Time
DateTime time.Time
)
type Conn = driver.Conn
type (
Progress = proto.Progress
Exception = proto.Exception
ProfileInfo = proto.ProfileInfo
ServerVersion = proto.ServerHandshake
)
var (
ErrBatchAlreadySent = errors.New("clickhouse: batch has already been sent")
ErrAcquireConnTimeout = errors.New("clickhouse: acquire conn timeout")
ErrUnsupportedServerRevision = errors.New("clickhouse: unsupported server revision")
ErrBindMixedNamedAndNumericParams = errors.New("clickhouse [bind]: mixed named and numeric parameters")
)
type OpError struct {
Op string
ColumnName string
Err error
}
func (e *OpError) Error() string {
switch err := e.Err.(type) {
case *column.Error:
return fmt.Sprintf("clickhouse [%s]: (%s %s) %s", e.Op, e.ColumnName, err.ColumnType, err.Err)
case *column.ColumnConverterError:
var hint string
if len(err.Hint) != 0 {
hint += ". " + err.Hint
}
return fmt.Sprintf("clickhouse [%s]: (%s) converting %s to %s is unsupported%s",
err.Op, e.ColumnName,
err.From, err.To,
hint,
)
}
return fmt.Sprintf("clickhouse [%s]: %s", e.Op, e.Err)
}
func Open(opt *Options) (driver.Conn, error) {
opt.setDefaults()
return &clickhouse{
opt: opt,
idle: make(chan *connect, opt.MaxIdleConns),
open: make(chan struct{}, opt.MaxOpenConns),
}, nil
}
type clickhouse struct {
opt *Options
idle chan *connect
open chan struct{}
connID int64
}
func (ch *clickhouse) ServerVersion() (*driver.ServerVersion, error) {
var (
ctx, cancel = context.WithTimeout(context.Background(), ch.opt.DialTimeout)
conn, err = ch.acquire(ctx)
)
defer cancel()
if err != nil {
return nil, err
}
defer ch.release(conn)
return &conn.server, nil
}
func (ch *clickhouse) Query(ctx context.Context, query string, args ...interface{}) (rows driver.Rows, err error) {
conn, err := ch.acquire(ctx)
if err != nil {
return nil, err
}
defer ch.release(conn)
return conn.query(ctx, query, args...)
}
func (ch *clickhouse) QueryRow(ctx context.Context, query string, args ...interface{}) (rows driver.Row) {
conn, err := ch.acquire(ctx)
if err != nil {
return &row{
err: err,
}
}
defer ch.release(conn)
return conn.queryRow(ctx, query, args...)
}
func (ch *clickhouse) Exec(ctx context.Context, query string, args ...interface{}) error {
conn, err := ch.acquire(ctx)
if err != nil {
return err
}
defer ch.release(conn)
return conn.exec(ctx, query, args...)
}
func (ch *clickhouse) PrepareBatch(ctx context.Context, query string) (driver.Batch, error) {
conn, err := ch.acquire(ctx)
if err != nil {
return nil, err
}
return conn.prepareBatch(ctx, query, ch.release)
}
func (ch *clickhouse) Ping(ctx context.Context) error {
conn, err := ch.acquire(ctx)
if err != nil {
return err
}
defer ch.release(conn)
return nil
}
func (ch *clickhouse) Stats() driver.Stats {
return driver.Stats{
Open: len(ch.open),
Idle: len(ch.idle),
MaxOpenConns: cap(ch.open),
MaxIdleConns: cap(ch.idle),
}
}
func (ch *clickhouse) dial() (conn *connect, err error) {
connID := int(atomic.AddInt64(&ch.connID, 1))
for num := range ch.opt.Addr {
if ch.opt.ConnOpenStrategy == ConnOpenRoundRobin {
num = int(connID) % len(ch.opt.Addr)
}
if conn, err = dial(ch.opt.Addr[num], connID, ch.opt); err == nil {
return conn, nil
}
}
return nil, err
}
func (ch *clickhouse) acquire(ctx context.Context) (conn *connect, err error) {
timer := time.NewTimer(time.Second)
defer timer.Stop()
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
select {
case <-timer.C:
return nil, ErrAcquireConnTimeout
case ch.open <- struct{}{}:
}
select {
case <-timer.C:
return nil, ErrAcquireConnTimeout
case conn := <-ch.idle:
if conn.isBad() {
conn.close()
return ch.dial()
}
conn.released = false
return conn, nil
default:
}
return ch.dial()
}
func (ch *clickhouse) release(conn *connect) {
if conn.released {
return
}
conn.released = true
select {
case <-ch.open:
default:
}
if conn.err != nil || time.Since(conn.connectedAt) >= ch.opt.ConnMaxLifetime {
conn.close()
return
}
select {
case ch.idle <- conn:
default:
conn.close()
}
}
func (ch *clickhouse) Close() error {
for {
select {
case c := <-ch.idle:
c.close()
default:
return nil
}
}
}