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request.go
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request.go
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package client
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/docker/engine-api/client/transport/cancellable"
"golang.org/x/net/context"
)
// serverResponse is a wrapper for http API responses.
type serverResponse struct {
body io.ReadCloser
header http.Header
statusCode int
}
// head sends an http request to the docker API using the method HEAD.
func (cli *Client) head(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
return cli.sendRequest(ctx, "HEAD", path, query, nil, headers)
}
// getWithContext sends an http request to the docker API using the method GET with a specific go context.
func (cli *Client) get(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
return cli.sendRequest(ctx, "GET", path, query, nil, headers)
}
// postWithContext sends an http request to the docker API using the method POST with a specific go context.
func (cli *Client) post(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
return cli.sendRequest(ctx, "POST", path, query, obj, headers)
}
func (cli *Client) postRaw(ctx context.Context, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
return cli.sendClientRequest(ctx, "POST", path, query, body, headers)
}
// put sends an http request to the docker API using the method PUT.
func (cli *Client) put(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
return cli.sendRequest(ctx, "PUT", path, query, obj, headers)
}
// put sends an http request to the docker API using the method PUT.
func (cli *Client) putRaw(ctx context.Context, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
return cli.sendClientRequest(ctx, "PUT", path, query, body, headers)
}
// delete sends an http request to the docker API using the method DELETE.
func (cli *Client) delete(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
return cli.sendRequest(ctx, "DELETE", path, query, nil, headers)
}
func (cli *Client) sendRequest(ctx context.Context, method, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
var body io.Reader
if obj != nil {
var err error
body, err = encodeData(obj)
if err != nil {
return nil, err
}
if headers == nil {
headers = make(map[string][]string)
}
headers["Content-Type"] = []string{"application/json"}
}
return cli.sendClientRequest(ctx, method, path, query, body, headers)
}
func (cli *Client) sendClientRequest(ctx context.Context, method, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
serverResp := &serverResponse{
body: nil,
statusCode: -1,
}
expectedPayload := (method == "POST" || method == "PUT")
if expectedPayload && body == nil {
body = bytes.NewReader([]byte{})
}
req, err := cli.newRequest(method, path, query, body, headers)
if cli.proto == "unix" || cli.proto == "npipe" {
// For local communications, it doesn't matter what the host is. We just
// need a valid and meaningful host name. (See #189)
req.Host = "docker"
}
req.URL.Host = cli.addr
req.URL.Scheme = cli.transport.Scheme()
if expectedPayload && req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", "text/plain")
}
resp, err := cancellable.Do(ctx, cli.transport, req)
if resp != nil {
serverResp.statusCode = resp.StatusCode
}
if err != nil {
if isTimeout(err) || strings.Contains(err.Error(), "connection refused") || strings.Contains(err.Error(), "dial unix") {
return serverResp, ErrConnectionFailed
}
if !cli.transport.Secure() && strings.Contains(err.Error(), "malformed HTTP response") {
return serverResp, fmt.Errorf("%v.\n* Are you trying to connect to a TLS-enabled daemon without TLS?", err)
}
if cli.transport.Secure() && strings.Contains(err.Error(), "remote error: bad certificate") {
return serverResp, fmt.Errorf("The server probably has client authentication (--tlsverify) enabled. Please check your TLS client certification settings: %v", err)
}
return serverResp, fmt.Errorf("An error occurred trying to connect: %v", err)
}
if serverResp.statusCode < 200 || serverResp.statusCode >= 400 {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return serverResp, err
}
if len(body) == 0 {
return serverResp, fmt.Errorf("Error: request returned %s for API route and version %s, check if the server supports the requested API version", http.StatusText(serverResp.statusCode), req.URL)
}
return serverResp, fmt.Errorf("Error response from daemon: %s", bytes.TrimSpace(body))
}
serverResp.body = resp.Body
serverResp.header = resp.Header
return serverResp, nil
}
func (cli *Client) newRequest(method, path string, query url.Values, body io.Reader, headers map[string][]string) (*http.Request, error) {
apiPath := cli.getAPIPath(path, query)
req, err := http.NewRequest(method, apiPath, body)
if err != nil {
return nil, err
}
// Add CLI Config's HTTP Headers BEFORE we set the Docker headers
// then the user can't change OUR headers
for k, v := range cli.customHTTPHeaders {
req.Header.Set(k, v)
}
if headers != nil {
for k, v := range headers {
req.Header[k] = v
}
}
return req, nil
}
func encodeData(data interface{}) (*bytes.Buffer, error) {
params := bytes.NewBuffer(nil)
if data != nil {
if err := json.NewEncoder(params).Encode(data); err != nil {
return nil, err
}
}
return params, nil
}
func ensureReaderClosed(response *serverResponse) {
if response != nil && response.body != nil {
response.body.Close()
}
}
func isTimeout(err error) bool {
type timeout interface {
Timeout() bool
}
e := err
switch urlErr := err.(type) {
case *url.Error:
e = urlErr.Err
}
t, ok := e.(timeout)
return ok && t.Timeout()
}