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128 lines
3.3 KiB
128 lines
3.3 KiB
/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rpc
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import (
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"bytes"
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"context"
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"crypto/tls"
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"encoding/gob"
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"errors"
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"fmt"
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"net"
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"net/http"
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"reflect"
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"time"
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xhttp "github.com/minio/minio/cmd/http"
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xnet "github.com/minio/minio/pkg/net"
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)
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// DefaultRPCTimeout - default RPC timeout is one minute.
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const DefaultRPCTimeout = 1 * time.Minute
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// Client - http based RPC client.
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type Client struct {
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httpClient *http.Client
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serviceURL *xnet.URL
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}
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// Call - calls service method on RPC server.
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func (client *Client) Call(serviceMethod string, args, reply interface{}) error {
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replyKind := reflect.TypeOf(reply).Kind()
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if replyKind != reflect.Ptr {
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return fmt.Errorf("rpc reply must be a pointer type, but found %v", replyKind)
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}
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data, err := gobEncode(args)
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if err != nil {
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return err
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}
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callRequest := CallRequest{
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Method: serviceMethod,
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ArgBytes: data,
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}
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var buf bytes.Buffer
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if err = gob.NewEncoder(&buf).Encode(callRequest); err != nil {
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return err
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}
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response, err := client.httpClient.Post(client.serviceURL.String(), "", &buf)
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if err != nil {
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return err
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}
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defer response.Body.Close()
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if response.StatusCode != http.StatusOK {
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return fmt.Errorf("%v rpc call failed with error code %v", serviceMethod, response.StatusCode)
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}
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var callResponse CallResponse
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if err := gob.NewDecoder(response.Body).Decode(&callResponse); err != nil {
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return err
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}
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if callResponse.Error != "" {
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return errors.New(callResponse.Error)
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}
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return gobDecode(callResponse.ReplyBytes, reply)
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}
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// Close - does nothing and presents for interface compatibility.
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func (client *Client) Close() error {
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return nil
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}
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func newCustomDialContext(timeout time.Duration) func(ctx context.Context, network, addr string) (net.Conn, error) {
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return func(ctx context.Context, network, addr string) (net.Conn, error) {
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dialer := &net.Dialer{
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Timeout: timeout,
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KeepAlive: timeout,
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DualStack: true,
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}
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conn, err := dialer.DialContext(ctx, network, addr)
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if err != nil {
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return nil, err
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}
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return xhttp.NewTimeoutConn(conn, timeout, timeout), nil
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}
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}
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// NewClient - returns new RPC client.
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func NewClient(serviceURL *xnet.URL, tlsConfig *tls.Config, timeout time.Duration) *Client {
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return &Client{
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httpClient: &http.Client{
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// Transport is exactly same as Go default in https://golang.org/pkg/net/http/#RoundTripper
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// except custom DialContext and TLSClientConfig.
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Transport: &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: newCustomDialContext(timeout),
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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TLSClientConfig: tlsConfig,
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},
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},
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serviceURL: serviceURL,
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}
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}
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