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|
// +build varlink,!remoteclient
package main
import (
"fmt"
"net"
"os"
"path/filepath"
"strings"
"time"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
iopodman "github.com/containers/libpod/cmd/podman/varlink"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/adapter"
api "github.com/containers/libpod/pkg/api/server"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/pkg/systemd"
"github.com/containers/libpod/pkg/util"
"github.com/containers/libpod/pkg/varlinkapi"
"github.com/containers/libpod/version"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/varlink/go/varlink"
)
var (
serviceCommand cliconfig.ServiceValues
serviceDescription = `Run an API service
Enable a listening service for API access to Podman commands.
`
_serviceCommand = &cobra.Command{
Use: "service [flags] [URI]",
Short: "Run API service",
Long: serviceDescription,
RunE: func(cmd *cobra.Command, args []string) error {
serviceCommand.InputArgs = args
serviceCommand.GlobalFlags = MainGlobalOpts
return serviceCmd(&serviceCommand)
},
}
)
func init() {
serviceCommand.Command = _serviceCommand
serviceCommand.SetHelpTemplate(HelpTemplate())
serviceCommand.SetUsageTemplate(UsageTemplate())
flags := serviceCommand.Flags()
flags.Int64VarP(&serviceCommand.Timeout, "timeout", "t", 5, "Time until the service session expires in seconds. Use 0 to disable the timeout")
flags.BoolVar(&serviceCommand.Varlink, "varlink", false, "Use legacy varlink service instead of REST")
}
func serviceCmd(c *cliconfig.ServiceValues) error {
apiURI, err := resolveApiURI(c)
if err != nil {
return err
}
// Create a single runtime api consumption
runtime, err := libpodruntime.GetRuntimeDisableFDs(getContext(), &c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer func() {
if err := runtime.Shutdown(false); err != nil {
fmt.Fprintf(os.Stderr, "Failed to shutdown libpod runtime: %v", err)
}
}()
timeout := time.Duration(c.Timeout) * time.Second
if c.Varlink {
return runVarlink(runtime, apiURI, timeout, c)
}
return runREST(runtime, apiURI, timeout)
}
func resolveApiURI(c *cliconfig.ServiceValues) (string, error) {
var apiURI string
// When determining _*THE*_ listening endpoint --
// 1) User input wins always
// 2) systemd socket activation
// 3) rootless honors XDG_RUNTIME_DIR
// 4) if varlink -- adapter.DefaultVarlinkAddress
// 5) lastly adapter.DefaultAPIAddress
if len(c.InputArgs) > 0 {
apiURI = c.InputArgs[0]
} else if ok := systemd.SocketActivated(); ok {
apiURI = ""
} else if rootless.IsRootless() {
xdg, err := util.GetRuntimeDir()
if err != nil {
return "", err
}
socketName := "podman.sock"
if c.Varlink {
socketName = "io.podman"
}
socketDir := filepath.Join(xdg, "podman", socketName)
if _, err := os.Stat(filepath.Dir(socketDir)); err != nil {
if os.IsNotExist(err) {
if err := os.Mkdir(filepath.Dir(socketDir), 0755); err != nil {
return "", err
}
} else {
return "", err
}
}
apiURI = "unix:" + socketDir
} else if c.Varlink {
apiURI = adapter.DefaultVarlinkAddress
} else {
// For V2, default to the REST socket
apiURI = adapter.DefaultAPIAddress
}
if "" == apiURI {
logrus.Info("using systemd socket activation to determine API endpoint")
} else {
logrus.Infof("using API endpoint: %s", apiURI)
}
return apiURI, nil
}
func runREST(r *libpod.Runtime, uri string, timeout time.Duration) error {
logrus.Warn("This function is EXPERIMENTAL")
fmt.Println("This function is EXPERIMENTAL.")
var listener *net.Listener
if uri != "" {
fields := strings.Split(uri, ":")
if len(fields) == 1 {
return errors.Errorf("%s is an invalid socket destination", uri)
}
address := strings.Join(fields[1:], ":")
l, err := net.Listen(fields[0], address)
if err != nil {
return errors.Wrapf(err, "unable to create socket %s", uri)
}
defer l.Close()
listener = &l
}
server, err := api.NewServerWithSettings(r, timeout, listener)
if err != nil {
return err
}
defer func() {
if err := server.Shutdown(); err != nil {
fmt.Fprintf(os.Stderr, "Error when stopping service: %s", err)
}
}()
err = server.Serve()
logrus.Debugf("%d/%d Active connections/Total connections\n", server.ActiveConnections, server.TotalConnections)
return err
}
func runVarlink(r *libpod.Runtime, uri string, timeout time.Duration, c *cliconfig.ServiceValues) error {
var varlinkInterfaces = []*iopodman.VarlinkInterface{varlinkapi.New(&c.PodmanCommand, r)}
service, err := varlink.NewService(
"Atomic",
"podman",
version.Version,
"https://github.com/containers/libpod",
)
if err != nil {
return errors.Wrapf(err, "unable to create new varlink service")
}
for _, i := range varlinkInterfaces {
if err := service.RegisterInterface(i); err != nil {
return errors.Errorf("unable to register varlink interface %v", i)
}
}
// Run the varlink server at the given address
if err = service.Listen(uri, timeout); err != nil {
switch err.(type) {
case varlink.ServiceTimeoutError:
logrus.Infof("varlink service expired (use --timeout to increase session time beyond %d ms, 0 means never timeout)", timeout.String())
return nil
default:
return errors.Wrapf(err, "unable to start varlink service")
}
}
return nil
}
|
