mirror of https://github.com/minio/minio.git
129 lines
3.3 KiB
Go
129 lines
3.3 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2018 Minio, Inc.
|
|
*
|
|
* 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 rpc
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"crypto/tls"
|
|
"encoding/gob"
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"net/http"
|
|
"reflect"
|
|
"time"
|
|
|
|
xhttp "github.com/minio/minio/cmd/http"
|
|
xnet "github.com/minio/minio/pkg/net"
|
|
)
|
|
|
|
// DefaultRPCTimeout - default RPC timeout is one minute.
|
|
const DefaultRPCTimeout = 1 * time.Minute
|
|
|
|
// Client - http based RPC client.
|
|
type Client struct {
|
|
httpClient *http.Client
|
|
serviceURL *xnet.URL
|
|
}
|
|
|
|
// Call - calls service method on RPC server.
|
|
func (client *Client) Call(serviceMethod string, args, reply interface{}) error {
|
|
replyKind := reflect.TypeOf(reply).Kind()
|
|
if replyKind != reflect.Ptr {
|
|
return fmt.Errorf("rpc reply must be a pointer type, but found %v", replyKind)
|
|
}
|
|
|
|
data, err := gobEncode(args)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
callRequest := CallRequest{
|
|
Method: serviceMethod,
|
|
ArgBytes: data,
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
if err = gob.NewEncoder(&buf).Encode(callRequest); err != nil {
|
|
return err
|
|
}
|
|
|
|
response, err := client.httpClient.Post(client.serviceURL.String(), "", &buf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer response.Body.Close()
|
|
|
|
if response.StatusCode != http.StatusOK {
|
|
return fmt.Errorf("%v rpc call failed with error code %v", serviceMethod, response.StatusCode)
|
|
}
|
|
|
|
var callResponse CallResponse
|
|
if err := gob.NewDecoder(response.Body).Decode(&callResponse); err != nil {
|
|
return err
|
|
}
|
|
|
|
if callResponse.Error != "" {
|
|
return errors.New(callResponse.Error)
|
|
}
|
|
|
|
return gobDecode(callResponse.ReplyBytes, reply)
|
|
}
|
|
|
|
// Close - does nothing and presents for interface compatibility.
|
|
func (client *Client) Close() error {
|
|
return nil
|
|
}
|
|
|
|
func newCustomDialContext(timeout time.Duration) func(ctx context.Context, network, addr string) (net.Conn, error) {
|
|
return func(ctx context.Context, network, addr string) (net.Conn, error) {
|
|
dialer := &net.Dialer{
|
|
Timeout: timeout,
|
|
KeepAlive: timeout,
|
|
DualStack: true,
|
|
}
|
|
|
|
conn, err := dialer.DialContext(ctx, network, addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return xhttp.NewTimeoutConn(conn, timeout, timeout), nil
|
|
}
|
|
}
|
|
|
|
// NewClient - returns new RPC client.
|
|
func NewClient(serviceURL *xnet.URL, tlsConfig *tls.Config, timeout time.Duration) *Client {
|
|
return &Client{
|
|
httpClient: &http.Client{
|
|
// Transport is exactly same as Go default in https://golang.org/pkg/net/http/#RoundTripper
|
|
// except custom DialContext and TLSClientConfig.
|
|
Transport: &http.Transport{
|
|
Proxy: http.ProxyFromEnvironment,
|
|
DialContext: newCustomDialContext(timeout),
|
|
MaxIdleConns: 100,
|
|
IdleConnTimeout: 90 * time.Second,
|
|
TLSHandshakeTimeout: 10 * time.Second,
|
|
ExpectContinueTimeout: 1 * time.Second,
|
|
TLSClientConfig: tlsConfig,
|
|
},
|
|
},
|
|
serviceURL: serviceURL,
|
|
}
|
|
}
|