207 lines
6.7 KiB
Go
207 lines
6.7 KiB
Go
package client
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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"github.com/docker/engine-api/client/transport/cancellable"
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"github.com/docker/engine-api/types"
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"github.com/docker/engine-api/types/versions"
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"golang.org/x/net/context"
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)
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// serverResponse is a wrapper for http API responses.
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type serverResponse struct {
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body io.ReadCloser
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header http.Header
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statusCode int
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}
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// head sends an http request to the docker API using the method HEAD.
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func (cli *Client) head(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
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return cli.sendRequest(ctx, "HEAD", path, query, nil, headers)
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}
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// getWithContext sends an http request to the docker API using the method GET with a specific go context.
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func (cli *Client) get(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
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return cli.sendRequest(ctx, "GET", path, query, nil, headers)
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}
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// postWithContext sends an http request to the docker API using the method POST with a specific go context.
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func (cli *Client) post(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
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return cli.sendRequest(ctx, "POST", path, query, obj, headers)
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}
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func (cli *Client) postRaw(ctx context.Context, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
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return cli.sendClientRequest(ctx, "POST", path, query, body, headers)
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}
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// put sends an http request to the docker API using the method PUT.
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func (cli *Client) put(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
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return cli.sendRequest(ctx, "PUT", path, query, obj, headers)
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}
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// put sends an http request to the docker API using the method PUT.
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func (cli *Client) putRaw(ctx context.Context, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
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return cli.sendClientRequest(ctx, "PUT", path, query, body, headers)
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}
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// delete sends an http request to the docker API using the method DELETE.
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func (cli *Client) delete(ctx context.Context, path string, query url.Values, headers map[string][]string) (*serverResponse, error) {
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return cli.sendRequest(ctx, "DELETE", path, query, nil, headers)
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}
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func (cli *Client) sendRequest(ctx context.Context, method, path string, query url.Values, obj interface{}, headers map[string][]string) (*serverResponse, error) {
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var body io.Reader
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if obj != nil {
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var err error
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body, err = encodeData(obj)
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if err != nil {
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return nil, err
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}
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if headers == nil {
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headers = make(map[string][]string)
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}
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headers["Content-Type"] = []string{"application/json"}
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}
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return cli.sendClientRequest(ctx, method, path, query, body, headers)
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}
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func (cli *Client) sendClientRequest(ctx context.Context, method, path string, query url.Values, body io.Reader, headers map[string][]string) (*serverResponse, error) {
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serverResp := &serverResponse{
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body: nil,
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statusCode: -1,
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}
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expectedPayload := (method == "POST" || method == "PUT")
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if expectedPayload && body == nil {
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body = bytes.NewReader([]byte{})
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}
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req, err := cli.newRequest(method, path, query, body, headers)
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if err != nil {
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return serverResp, err
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}
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if cli.proto == "unix" || cli.proto == "npipe" {
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// For local communications, it doesn't matter what the host is. We just
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// need a valid and meaningful host name. (See #189)
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req.Host = "docker"
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}
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req.URL.Host = cli.addr
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req.URL.Scheme = cli.transport.Scheme()
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if expectedPayload && req.Header.Get("Content-Type") == "" {
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req.Header.Set("Content-Type", "text/plain")
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}
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resp, err := cancellable.Do(ctx, cli.transport, req)
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if err != nil {
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if isTimeout(err) || strings.Contains(err.Error(), "connection refused") || strings.Contains(err.Error(), "dial unix") {
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return serverResp, ErrConnectionFailed
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}
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if !cli.transport.Secure() && strings.Contains(err.Error(), "malformed HTTP response") {
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return serverResp, fmt.Errorf("%v.\n* Are you trying to connect to a TLS-enabled daemon without TLS?", err)
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}
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if cli.transport.Secure() && strings.Contains(err.Error(), "bad certificate") {
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return serverResp, fmt.Errorf("The server probably has client authentication (--tlsverify) enabled. Please check your TLS client certification settings: %v", err)
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}
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return serverResp, fmt.Errorf("An error occurred trying to connect: %v", err)
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}
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if resp != nil {
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serverResp.statusCode = resp.StatusCode
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}
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if serverResp.statusCode < 200 || serverResp.statusCode >= 400 {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return serverResp, err
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}
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if len(body) == 0 {
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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)
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}
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var errorMessage string
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if (cli.version == "" || versions.GreaterThan(cli.version, "1.23")) &&
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resp.Header.Get("Content-Type") == "application/json" {
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var errorResponse types.ErrorResponse
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if err := json.Unmarshal(body, &errorResponse); err != nil {
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return serverResp, fmt.Errorf("Error reading JSON: %v", err)
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}
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errorMessage = errorResponse.Message
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} else {
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errorMessage = string(body)
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}
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return serverResp, fmt.Errorf("Error response from daemon: %s", strings.TrimSpace(errorMessage))
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}
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serverResp.body = resp.Body
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serverResp.header = resp.Header
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return serverResp, nil
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}
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func (cli *Client) newRequest(method, path string, query url.Values, body io.Reader, headers map[string][]string) (*http.Request, error) {
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apiPath := cli.getAPIPath(path, query)
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req, err := http.NewRequest(method, apiPath, body)
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if err != nil {
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return nil, err
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}
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// Add CLI Config's HTTP Headers BEFORE we set the Docker headers
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// then the user can't change OUR headers
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for k, v := range cli.customHTTPHeaders {
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req.Header.Set(k, v)
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}
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if headers != nil {
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for k, v := range headers {
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req.Header[k] = v
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}
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}
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return req, nil
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}
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func encodeData(data interface{}) (*bytes.Buffer, error) {
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params := bytes.NewBuffer(nil)
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if data != nil {
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if err := json.NewEncoder(params).Encode(data); err != nil {
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return nil, err
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}
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}
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return params, nil
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}
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func ensureReaderClosed(response *serverResponse) {
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if response != nil && response.body != nil {
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// Drain up to 512 bytes and close the body to let the Transport reuse the connection
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io.CopyN(ioutil.Discard, response.body, 512)
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response.body.Close()
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}
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}
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func isTimeout(err error) bool {
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type timeout interface {
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Timeout() bool
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}
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e := err
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switch urlErr := err.(type) {
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case *url.Error:
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e = urlErr.Err
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}
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t, ok := e.(timeout)
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return ok && t.Timeout()
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}
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