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dnet.go
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dnet.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"os"
"os/signal"
"strings"
"syscall"
"github.com/codegangsta/cli"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/reexec"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/term"
"github.com/docker/libnetwork"
"github.com/docker/libnetwork/api"
"github.com/docker/libnetwork/config"
"github.com/docker/libnetwork/driverapi"
"github.com/docker/libnetwork/netlabel"
"github.com/docker/libnetwork/options"
"github.com/gorilla/mux"
)
const (
// DefaultHTTPHost is used if only port is provided to -H flag e.g. docker -d -H tcp://:8080
DefaultHTTPHost = "0.0.0.0"
// DefaultHTTPPort is the default http port used by dnet
DefaultHTTPPort = 2385
// DefaultUnixSocket exported
DefaultUnixSocket = "/var/run/dnet.sock"
cfgFileEnv = "LIBNETWORK_CFG"
defaultCfgFile = "/etc/default/libnetwork.toml"
)
var epConn *dnetConnection
func main() {
if reexec.Init() {
return
}
_, stdout, stderr := term.StdStreams()
logrus.SetOutput(stderr)
err := dnetApp(stdout, stderr)
if err != nil {
os.Exit(1)
}
}
func parseConfig(cfgFile string) (*config.Config, error) {
if strings.Trim(cfgFile, " ") == "" {
cfgFile = os.Getenv(cfgFileEnv)
if strings.Trim(cfgFile, " ") == "" {
cfgFile = defaultCfgFile
}
}
return config.ParseConfig(cfgFile)
}
func processConfig(cfg *config.Config) []config.Option {
options := []config.Option{}
if cfg == nil {
return options
}
dn := "bridge"
if strings.TrimSpace(cfg.Daemon.DefaultNetwork) != "" {
dn = cfg.Daemon.DefaultNetwork
}
options = append(options, config.OptionDefaultNetwork(dn))
dd := "bridge"
if strings.TrimSpace(cfg.Daemon.DefaultDriver) != "" {
dd = cfg.Daemon.DefaultDriver
}
options = append(options, config.OptionDefaultDriver(dd))
if cfg.Daemon.Labels != nil {
options = append(options, config.OptionLabels(cfg.Daemon.Labels))
}
if strings.TrimSpace(cfg.GlobalStore.Client.Provider) != "" {
options = append(options, config.OptionKVProvider(cfg.GlobalStore.Client.Provider))
}
if strings.TrimSpace(cfg.GlobalStore.Client.Address) != "" {
options = append(options, config.OptionKVProviderURL(cfg.GlobalStore.Client.Address))
}
return options
}
func dnetApp(stdout, stderr io.Writer) error {
app := cli.NewApp()
app.Name = "dnet"
app.Usage = "A self-sufficient runtime for container networking."
app.Flags = dnetFlags
app.Before = processFlags
app.Commands = dnetCommands
app.Run(os.Args)
return nil
}
func createDefaultNetwork(c libnetwork.NetworkController) {
nw := c.Config().Daemon.DefaultNetwork
d := c.Config().Daemon.DefaultDriver
createOptions := []libnetwork.NetworkOption{}
genericOption := options.Generic{}
if nw != "" && d != "" {
// Bridge driver is special due to legacy reasons
if d == "bridge" {
genericOption[netlabel.GenericData] = map[string]interface{}{
"BridgeName": nw,
}
networkOption := libnetwork.NetworkOptionGeneric(genericOption)
createOptions = append(createOptions, networkOption)
}
_, err := c.NewNetwork(d, nw, createOptions...)
if err != nil {
logrus.Errorf("Error creating default network : %s : %v", nw, err)
}
}
}
type dnetConnection struct {
// proto holds the client protocol i.e. unix.
proto string
// addr holds the client address.
addr string
}
func (d *dnetConnection) dnetDaemon(cfgFile string) error {
if err := startTestDriver(); err != nil {
return fmt.Errorf("failed to start test driver: %v\n", err)
}
cfg, err := parseConfig(cfgFile)
var cOptions []config.Option
if err == nil {
cOptions = processConfig(cfg)
}
controller, err := libnetwork.New(cOptions...)
if err != nil {
fmt.Println("Error starting dnetDaemon :", err)
return err
}
createDefaultNetwork(controller)
httpHandler := api.NewHTTPHandler(controller)
r := mux.NewRouter().StrictSlash(false)
post := r.PathPrefix("/{.*}/networks").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/networks").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/{.*}/services").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/services").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/{.*}/sandboxes").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/sandboxes").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
handleSignals(controller)
return http.ListenAndServe(d.addr, r)
}
func handleSignals(controller libnetwork.NetworkController) {
c := make(chan os.Signal, 1)
signals := []os.Signal{os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT}
signal.Notify(c, signals...)
go func() {
for _ = range c {
controller.Stop()
os.Exit(0)
}
}()
}
func startTestDriver() error {
mux := http.NewServeMux()
server := httptest.NewServer(mux)
if server == nil {
return fmt.Errorf("Failed to start a HTTP Server")
}
mux.HandleFunc("/Plugin.Activate", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, `{"Implements": ["%s"]}`, driverapi.NetworkPluginEndpointType)
})
mux.HandleFunc(fmt.Sprintf("/%s.GetCapabilities", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, `{"Scope":"global"}`)
})
mux.HandleFunc(fmt.Sprintf("/%s.CreateNetwork", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.DeleteNetwork", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.CreateEndpoint", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.DeleteEndpoint", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.Join", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.Leave", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
if err := os.MkdirAll("/usr/share/docker/plugins", 0755); err != nil {
return err
}
if err := ioutil.WriteFile("/usr/share/docker/plugins/test.spec", []byte(server.URL), 0644); err != nil {
return err
}
return nil
}
func newDnetConnection(val string) (*dnetConnection, error) {
url, err := parsers.ParseHost(DefaultHTTPHost, DefaultUnixSocket, val)
if err != nil {
return nil, err
}
protoAddrParts := strings.SplitN(url, "://", 2)
if len(protoAddrParts) != 2 {
return nil, fmt.Errorf("bad format, expected tcp://ADDR")
}
if strings.ToLower(protoAddrParts[0]) != "tcp" {
return nil, fmt.Errorf("dnet currently only supports tcp transport")
}
return &dnetConnection{protoAddrParts[0], protoAddrParts[1]}, nil
}
func (d *dnetConnection) httpCall(method, path string, data interface{}, headers map[string][]string) (io.ReadCloser, http.Header, int, error) {
var in io.Reader
in, err := encodeData(data)
if err != nil {
return nil, nil, -1, err
}
req, err := http.NewRequest(method, fmt.Sprintf("%s", path), in)
if err != nil {
return nil, nil, -1, err
}
setupRequestHeaders(method, data, req, headers)
req.URL.Host = d.addr
req.URL.Scheme = "http"
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
statusCode := -1
if resp != nil {
statusCode = resp.StatusCode
}
if err != nil {
return nil, nil, statusCode, fmt.Errorf("error when trying to connect: %v", err)
}
if statusCode < 200 || statusCode >= 400 {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, nil, statusCode, err
}
return nil, nil, statusCode, fmt.Errorf("error : %s", bytes.TrimSpace(body))
}
return resp.Body, resp.Header, statusCode, nil
}
func setupRequestHeaders(method string, data interface{}, req *http.Request, headers map[string][]string) {
if data != nil {
if headers == nil {
headers = make(map[string][]string)
}
headers["Content-Type"] = []string{"application/json"}
}
expectedPayload := (method == "POST" || method == "PUT")
if expectedPayload && req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", "text/plain")
}
if headers != nil {
for k, v := range headers {
req.Header[k] = v
}
}
}
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
}