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transport.go
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transport.go
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package clickhouse
import (
"bytes"
"mime/multipart"
"net/http"
"net/url"
"strings"
"time"
)
const (
httpTransportBodyType = "text/plain"
)
type Transport interface {
Exec(conn *Conn, q Query, readOnly bool) (res string, err error)
}
type HttpTransport struct {
Timeout time.Duration
}
func (t HttpTransport) Exec(conn *Conn, q Query, readOnly bool) (res string, err error) {
var req *http.Request
var resp *http.Response
query := prepareHttp(q.Stmt, q.args)
client := &http.Client{Timeout: t.Timeout}
if readOnly {
if len(query) > 0 {
query = "?query=" + query
}
req, err = http.NewRequest("GET", conn.Host+query, nil)
if err != nil {
return "", err
}
} else {
req, err = prepareExecPostRequest(conn.Host, q)
if err != nil {
return "", err
}
}
if len(conn.User) > 0 {
req.Header.Set("X-ClickHouse-User", conn.User)
}
if len(conn.Password) > 0 {
req.Header.Set("X-ClickHouse-Key", conn.Password)
}
resp, err = client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
buf := new(bytes.Buffer)
_, err = buf.ReadFrom(resp.Body)
return buf.String(), err
}
func prepareExecPostRequest(host string, q Query) (*http.Request, error) {
query := prepareHttp(q.Stmt, q.args)
var req *http.Request
var err error = nil
if len(q.externals) > 0 {
if len(query) > 0 {
query = "?query=" + url.QueryEscape(query)
}
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
for _, ext := range q.externals {
query = query + "&" + ext.Name + "_structure=" + url.QueryEscape(ext.Structure)
part, err := writer.CreateFormFile(ext.Name, ext.Name)
if err != nil {
return nil, err
}
_, err = part.Write(ext.Data)
if err != nil {
return nil, err
}
}
err = writer.Close()
if err != nil {
return nil, err
}
req, err = http.NewRequest("POST", host+query, body)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", writer.FormDataContentType())
} else {
req, err = http.NewRequest("POST", host, strings.NewReader(query))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", httpTransportBodyType)
}
return req, err
}
func prepareHttp(stmt string, args []interface{}) string {
var res []byte
buf := []byte(stmt)
res = make([]byte, 0)
k := 0
for _, ch := range buf {
if ch == '?' {
res = append(res, []byte(marshal(args[k]))...)
k++
} else {
res = append(res, ch)
}
}
return string(res)
}