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126 lines
3.7 KiB
126 lines
3.7 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 rest
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import (
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"context"
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"crypto/tls"
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"errors"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"time"
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xhttp "github.com/minio/minio/cmd/http"
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)
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// DefaultRESTTimeout - default RPC timeout is one minute.
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const DefaultRESTTimeout = 1 * time.Minute
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// NetworkError - error type in case of errors related to http/transport
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// for ex. connection refused, connection reset, dns resolution failure etc.
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// All errors returned by storage-rest-server (ex errFileNotFound, errDiskNotFound) are not considered to be network errors.
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type NetworkError struct {
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Err error
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}
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func (n *NetworkError) Error() string {
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return n.Err.Error()
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}
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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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httpIdleConnsCloser func()
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url *url.URL
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newAuthToken func() string
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}
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// Call - make a REST call.
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func (c *Client) Call(method string, values url.Values, body io.Reader, length int64) (reply io.ReadCloser, err error) {
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req, err := http.NewRequest(http.MethodPost, c.url.String()+"/"+method+"?"+values.Encode(), body)
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if err != nil {
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return nil, &NetworkError{err}
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}
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req.Header.Set("Authorization", "Bearer "+c.newAuthToken())
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req.Header.Set("X-Minio-Time", time.Now().UTC().Format(time.RFC3339))
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if length > 0 {
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req.ContentLength = length
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, &NetworkError{err}
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}
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if resp.StatusCode != http.StatusOK {
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defer xhttp.DrainBody(resp.Body)
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// Limit the ReadAll(), just in case, because of a bug, the server responds with large data.
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b, err := ioutil.ReadAll(io.LimitReader(resp.Body, 4096))
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if err != nil {
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return nil, err
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}
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if len(b) > 0 {
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return nil, errors.New(string(b))
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}
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return nil, errors.New(resp.Status)
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}
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return resp.Body, nil
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}
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// Close closes all idle connections of the underlying http client
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func (c *Client) Close() {
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if c.httpIdleConnsCloser != nil {
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c.httpIdleConnsCloser()
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}
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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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return dialer.DialContext(ctx, network, addr)
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}
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}
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// NewClient - returns new REST client.
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func NewClient(url *url.URL, tlsConfig *tls.Config, timeout time.Duration, newAuthToken func() string) (*Client, error) {
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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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tr := &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: newCustomDialContext(timeout),
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MaxIdleConnsPerHost: 256,
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IdleConnTimeout: 60 * time.Second,
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TLSHandshakeTimeout: 30 * time.Second,
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ExpectContinueTimeout: 10 * time.Second,
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TLSClientConfig: tlsConfig,
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DisableCompression: true,
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}
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return &Client{
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httpClient: &http.Client{Transport: tr},
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httpIdleConnsCloser: tr.CloseIdleConnections,
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url: url,
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newAuthToken: newAuthToken,
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}, nil
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}
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