woodpecker/shared/build/docker/client.go

379 lines
8.9 KiB
Go

package docker
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"os"
"strings"
"time"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/pkg/term"
"github.com/docker/docker/utils"
)
const (
APIVERSION = 1.9
DEFAULTHTTPPORT = 2375
DEFAULTUNIXSOCKET = "/var/run/docker.sock"
DEFAULTPROTOCOL = "unix"
DEFAULTTAG = "latest"
VERSION = "0.8.0"
)
// Enables verbose logging to the Terminal window
var Logging = true
// New creates an instance of the Docker Client
func New() *Client {
return NewHost("")
}
func NewHost(uri string) *Client {
var cli, _ = NewHostCert(uri, nil, nil)
return cli
}
func NewHostCertFile(uri, cert, key string) (*Client, error) {
if len(key) == 0 || len(cert) == 0 {
return NewHostCert(uri, nil, nil)
}
certfile, err := ioutil.ReadFile(cert)
if err != nil {
return nil, err
}
keyfile, err := ioutil.ReadFile(key)
if err != nil {
return nil, err
}
return NewHostCert(uri, certfile, keyfile)
}
func NewHostCert(uri string, cert, key []byte) (*Client, error) {
var host = GetHost(uri)
var proto, addr = SplitProtoAddr(host)
var cli = new(Client)
cli.proto = proto
cli.addr = addr
cli.scheme = "http"
cli.Images = &ImageService{cli}
cli.Containers = &ContainerService{cli}
// if no certificate is provided returns the
// client with no TLS configured.
if cert == nil || key == nil || len(cert) == 0 || len(key) == 0 {
return cli, nil
}
// loads the key value pair in pem format
pem, err := tls.X509KeyPair(cert, key)
if err != nil {
return nil, err
}
// setup the client TLS and store the certificate.
// also skip verification since we are (typically)
// going to be using certs for IP addresses.
cli.scheme = "https"
cli.tls = new(tls.Config)
cli.tls.InsecureSkipVerify = true
cli.tls.Certificates = []tls.Certificate{pem}
// disable compression for local socket communication.
if cli.proto == DEFAULTPROTOCOL {
cli.trans.DisableCompression = true
}
// creates a transport that uses the custom tls configuration
// to securely connect to remote Docker clients.
cli.trans = &http.Transport{
TLSClientConfig: cli.tls,
Dial: func(dial_network, dial_addr string) (net.Conn, error) {
return net.DialTimeout(cli.proto, cli.addr, 32*time.Second)
},
}
return cli, nil
}
// GetHost returns the Docker Host address in order to
// connect to the Docker Daemon. It implements a very
// simple set of fallthrough logic to determine which
// address to use.
func GetHost(host string) string {
// if a default value was provided this
// shoudl be used
if len(host) != 0 {
return host
}
// else attempt to use the DOCKER_HOST
// environment variable
var env = os.Getenv("DOCKER_HOST")
if len(env) != 0 {
return env
}
// else check to see if the default unix
// socket exists and return
_, err := os.Stat(DEFAULTUNIXSOCKET)
if err == nil {
return fmt.Sprintf("%s://%s", DEFAULTPROTOCOL, DEFAULTUNIXSOCKET)
}
// else return the standard TCP address
return fmt.Sprintf("tcp://0.0.0.0:%d", DEFAULTHTTPPORT)
}
// SplitProtoAddr is a helper function that splits
// a host into Protocol and Address.
func SplitProtoAddr(host string) (string, string) {
var parts = strings.Split(host, "://")
var proto, addr string
switch {
case len(parts) == 2:
proto = parts[0]
addr = parts[1]
default:
proto = "tcp"
addr = parts[0]
}
return proto, addr
}
type Client struct {
tls *tls.Config
trans *http.Transport
scheme string
proto string
addr string
Images *ImageService
Containers *ContainerService
}
var (
// Returned if the specified resource does not exist.
ErrNotFound = errors.New("Not Found")
// Return if something going wrong
ErrInternalServer = errors.New("Internal Server Error")
// Returned if the caller attempts to make a call or modify a resource
// for which the caller is not authorized.
//
// The request was a valid request, the caller's authentication credentials
// succeeded but those credentials do not grant the caller permission to
// access the resource.
ErrForbidden = errors.New("Forbidden")
// Returned if the call requires authentication and either the credentials
// provided failed or no credentials were provided.
ErrNotAuthorized = errors.New("Unauthorized")
// Returned if the caller submits a badly formed request. For example,
// the caller can receive this return if you forget a required parameter.
ErrBadRequest = errors.New("Bad Request")
)
// helper function used to make HTTP requests to the Docker daemon.
func (c *Client) do(method, path string, in, out interface{}) error {
// if data input is provided, serialize to JSON
var payload io.Reader
if in != nil {
buf, err := json.Marshal(in)
if err != nil {
return err
}
payload = bytes.NewBuffer(buf)
}
// create the request
req, err := http.NewRequest(method, fmt.Sprintf("/v%g%s", APIVERSION, path), payload)
if err != nil {
return err
}
// set the appropariate headers
req.Header = http.Header{}
req.Header.Set("User-Agent", "Docker-Client/"+VERSION)
req.Header.Set("Content-Type", "application/json")
// dial the host server
req.URL.Host = c.addr
req.URL.Scheme = "http"
if c.tls != nil {
req.URL.Scheme = "https"
}
resp, err := c.HTTPClient().Do(req)
if err != nil {
return err
}
// make sure we defer close the body
defer resp.Body.Close()
// Check for an http error status (ie not 200 StatusOK)
switch resp.StatusCode {
case 500:
return ErrInternalServer
case 404:
return ErrNotFound
case 403:
return ErrForbidden
case 401:
return ErrNotAuthorized
case 400:
return ErrBadRequest
}
// Decode the JSON response
if out != nil {
return json.NewDecoder(resp.Body).Decode(out)
}
return nil
}
func (c *Client) hijack(method, path string, setRawTerminal bool, out io.Writer) error {
req, err := http.NewRequest(method, fmt.Sprintf("/v%g%s", APIVERSION, path), nil)
if err != nil {
return err
}
req.Header.Set("User-Agent", "Docker-Client/"+VERSION)
req.Header.Set("Content-Type", "plain/text")
req.Host = c.addr
dial, err := c.Dial()
if err != nil {
if strings.Contains(err.Error(), "connection refused") {
return fmt.Errorf("Can't connect to docker daemon. Is 'docker -d' running on this host?")
}
return err
}
clientconn := httputil.NewClientConn(dial, nil)
defer clientconn.Close()
// Server hijacks the connection, error 'connection closed' expected
clientconn.Do(req)
// Hijack the connection to read / write
rwc, br := clientconn.Hijack()
defer rwc.Close()
// launch a goroutine to copy the stream
// of build output to the writer.
errStdout := make(chan error, 1)
go func() {
var err error
if setRawTerminal {
_, err = io.Copy(out, br)
} else {
_, err = stdcopy.StdCopy(out, out, br)
}
errStdout <- err
}()
// wait for a response
if err := <-errStdout; err != nil {
return err
}
return nil
}
func (c *Client) stream(method, path string, in io.Reader, out io.Writer, headers http.Header) error {
if (method == "POST" || method == "PUT") && in == nil {
in = bytes.NewReader(nil)
}
// setup the request
req, err := http.NewRequest(method, fmt.Sprintf("/v%g%s", APIVERSION, path), in)
if err != nil {
return err
}
// set default headers
req.Header = headers
req.Header.Set("User-Agent", "Docker-Client/0.6.4")
req.Header.Set("Content-Type", "plain/text")
// dial the host server
req.URL.Host = c.addr
req.URL.Scheme = "http"
if c.tls != nil {
req.URL.Scheme = "https"
}
resp, err := c.HTTPClient().Do(req)
if err != nil {
return err
}
// make sure we defer close the body
defer resp.Body.Close()
// Check for an http error status (ie not 200 StatusOK)
switch resp.StatusCode {
case 500:
return ErrInternalServer
case 404:
return ErrNotFound
case 403:
return ErrForbidden
case 401:
return ErrNotAuthorized
case 400:
return ErrBadRequest
}
// If no output we exit now with no errors
if out == nil {
io.Copy(ioutil.Discard, resp.Body)
return nil
}
// copy the output stream to the writer
if resp.Header.Get("Content-Type") == "application/json" {
var terminalFd = os.Stdin.Fd()
var isTerminal = term.IsTerminal(terminalFd)
// it may not make sense to put this code here, but it works for
// us at the moment, and I don't feel like refactoring
return utils.DisplayJSONMessagesStream(resp.Body, out, terminalFd, isTerminal)
}
// otherwise plain text
if _, err := io.Copy(out, resp.Body); err != nil {
return err
}
return nil
}
func (c *Client) HTTPClient() *http.Client {
if c.trans != nil {
return &http.Client{Transport: c.trans}
}
return &http.Client{
Transport: &http.Transport{
Dial: func(dial_network, dial_addr string) (net.Conn, error) {
return net.DialTimeout(c.proto, c.addr, 32*time.Second)
},
},
}
}
func (c *Client) Dial() (net.Conn, error) {
if c.tls != nil && c.proto != "unix" {
return tls.Dial(c.proto, c.addr, c.tls)
}
return net.Dial(c.proto, c.addr)
}