Vendor main dependencies.

vendor/github.com/docker/engine-api/client/request.go

@@ -0,0 +1,207 @@
+package client
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/docker/engine-api/client/transport/cancellable"
+	"github.com/docker/engine-api/types"
+	"github.com/docker/engine-api/types/versions"
+	"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 err != nil {
+		return serverResp, err
+	}
+
+	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 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(), "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 resp != nil {
+		serverResp.statusCode = resp.StatusCode
+	}
+
+	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)
+		}
+
+		var errorMessage string
+		if (cli.version == "" || versions.GreaterThan(cli.version, "1.23")) &&
+			resp.Header.Get("Content-Type") == "application/json" {
+			var errorResponse types.ErrorResponse
+			if err := json.Unmarshal(body, &errorResponse); err != nil {
+				return serverResp, fmt.Errorf("Error reading JSON: %v", err)
+			}
+			errorMessage = errorResponse.Message
+		} else {
+			errorMessage = string(body)
+		}
+
+		return serverResp, fmt.Errorf("Error response from daemon: %s", strings.TrimSpace(errorMessage))
+	}
+
+	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 {
+		// Drain up to 512 bytes and close the body to let the Transport reuse the connection
+		io.CopyN(ioutil.Discard, response.body, 512)
+		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()
+}