141 lines
4 KiB
Go
141 lines
4 KiB
Go
package client
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import (
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"fmt"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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"github.com/docker/engine-api/client/transport"
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"github.com/docker/go-connections/tlsconfig"
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)
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// Client is the API client that performs all operations
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// against a docker server.
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type Client struct {
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// proto holds the client protocol i.e. unix.
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proto string
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// addr holds the client address.
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addr string
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// basePath holds the path to prepend to the requests.
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basePath string
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// transport is the interface to send request with, it implements transport.Client.
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transport transport.Client
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// version of the server to talk to.
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version string
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// custom http headers configured by users.
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customHTTPHeaders map[string]string
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}
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// NewEnvClient initializes a new API client based on environment variables.
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// Use DOCKER_HOST to set the url to the docker server.
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// Use DOCKER_API_VERSION to set the version of the API to reach, leave empty for latest.
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// Use DOCKER_CERT_PATH to load the tls certificates from.
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// Use DOCKER_TLS_VERIFY to enable or disable TLS verification, off by default.
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func NewEnvClient() (*Client, error) {
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var client *http.Client
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if dockerCertPath := os.Getenv("DOCKER_CERT_PATH"); dockerCertPath != "" {
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options := tlsconfig.Options{
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CAFile: filepath.Join(dockerCertPath, "ca.pem"),
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CertFile: filepath.Join(dockerCertPath, "cert.pem"),
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KeyFile: filepath.Join(dockerCertPath, "key.pem"),
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InsecureSkipVerify: os.Getenv("DOCKER_TLS_VERIFY") == "",
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}
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tlsc, err := tlsconfig.Client(options)
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if err != nil {
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return nil, err
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}
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client = &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: tlsc,
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},
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}
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}
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host := os.Getenv("DOCKER_HOST")
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if host == "" {
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host = DefaultDockerHost
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}
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return NewClient(host, os.Getenv("DOCKER_API_VERSION"), client, nil)
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}
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// NewClient initializes a new API client for the given host and API version.
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// It won't send any version information if the version number is empty.
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// It uses the given http client as transport.
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// It also initializes the custom http headers to add to each request.
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func NewClient(host string, version string, client *http.Client, httpHeaders map[string]string) (*Client, error) {
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proto, addr, basePath, err := ParseHost(host)
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if err != nil {
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return nil, err
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}
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transport, err := transport.NewTransportWithHTTP(proto, addr, client)
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if err != nil {
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return nil, err
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}
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return &Client{
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proto: proto,
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addr: addr,
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basePath: basePath,
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transport: transport,
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version: version,
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customHTTPHeaders: httpHeaders,
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}, nil
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}
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// getAPIPath returns the versioned request path to call the api.
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// It appends the query parameters to the path if they are not empty.
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func (cli *Client) getAPIPath(p string, query url.Values) string {
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var apiPath string
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if cli.version != "" {
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v := strings.TrimPrefix(cli.version, "v")
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apiPath = fmt.Sprintf("%s/v%s%s", cli.basePath, v, p)
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} else {
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apiPath = fmt.Sprintf("%s%s", cli.basePath, p)
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}
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u := &url.URL{
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Path: apiPath,
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}
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if len(query) > 0 {
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u.RawQuery = query.Encode()
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}
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return u.String()
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}
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// ClientVersion returns the version string associated with this
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// instance of the Client. Note that this value can be changed
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// via the DOCKER_API_VERSION env var.
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func (cli *Client) ClientVersion() string {
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return cli.version
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}
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// UpdateClientVersion updates the version string associated with this
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// instance of the Client.
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func (cli *Client) UpdateClientVersion(v string) {
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cli.version = v
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}
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// ParseHost verifies that the given host strings is valid.
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func ParseHost(host string) (string, string, string, error) {
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protoAddrParts := strings.SplitN(host, "://", 2)
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if len(protoAddrParts) == 1 {
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return "", "", "", fmt.Errorf("unable to parse docker host `%s`", host)
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}
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var basePath string
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proto, addr := protoAddrParts[0], protoAddrParts[1]
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if proto == "tcp" {
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parsed, err := url.Parse("tcp://" + addr)
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if err != nil {
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return "", "", "", err
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}
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addr = parsed.Host
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basePath = parsed.Path
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}
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return proto, addr, basePath, nil
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}
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