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create.go
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create.go
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package service
import (
"errors"
"fmt"
"strconv"
"strings"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/cmd/swarmctl/common"
"github.com/docker/swarmkit/cmd/swarmctl/network"
"github.com/spf13/cobra"
)
var (
createCmd = &cobra.Command{
Use: "create",
Short: "Create a service",
RunE: func(cmd *cobra.Command, args []string) error {
flags := cmd.Flags()
var spec *api.ServiceSpec
c, err := common.Dial(cmd)
if err != nil {
return err
}
if !flags.Changed("name") || !flags.Changed("image") {
return errors.New("--name and --image are mandatory")
}
name, err := flags.GetString("name")
if err != nil {
return err
}
image, err := flags.GetString("image")
if err != nil {
return err
}
mode, err := flags.GetString("mode")
if err != nil {
return err
}
instances, err := flags.GetUint64("instances")
if err != nil {
return err
}
containerArgs, err := flags.GetStringSlice("args")
if err != nil {
return err
}
env, err := flags.GetStringSlice("env")
if err != nil {
return err
}
spec = &api.ServiceSpec{
Annotations: api.Annotations{
Name: name,
},
Task: api.TaskSpec{
Runtime: &api.TaskSpec_Container{
Container: &api.ContainerSpec{
Image: image,
Command: containerArgs,
Args: args,
Env: env,
},
},
},
}
switch mode {
case "global":
spec.Mode = &api.ServiceSpec_Global{}
case "replicated":
spec.Mode = &api.ServiceSpec_Replicated{
Replicated: &api.ReplicatedService{
Instances: instances,
},
}
}
if flags.Changed("ports") {
portConfigs, err := flags.GetStringSlice("ports")
if err != nil {
return err
}
ports := []*api.PortConfig{}
for _, portConfig := range portConfigs {
name, protocol, port, swarmPort, err := parsePortConfig(portConfig)
if err != nil {
return err
}
ports = append(ports, &api.PortConfig{
Name: name,
Protocol: protocol,
Port: port,
SwarmPort: swarmPort,
})
}
spec.Endpoint = &api.EndpointSpec{
ExposedPorts: ports,
}
}
if flags.Changed("network") {
input, err := flags.GetString("network")
if err != nil {
return err
}
n, err := network.GetNetwork(common.Context(cmd), c, input)
if err != nil {
return err
}
spec.Networks = []*api.ServiceSpec_NetworkAttachmentConfig{
{
Target: n.ID,
},
}
}
r, err := c.CreateService(common.Context(cmd), &api.CreateServiceRequest{Spec: spec})
if err != nil {
return err
}
fmt.Println(r.Service.ID)
return nil
},
}
)
func parsePortConfig(portConfig string) (string, api.PortConfig_Protocol, uint32, uint32, error) {
protocol := api.ProtocolTCP
parts := strings.Split(portConfig, ":")
if len(parts) < 2 {
return "", protocol, 0, 0, fmt.Errorf("insuffient parameters in port configuration")
}
name := parts[0]
portSpec := parts[1]
protocol, port, err := parsePortSpec(portSpec)
if err != nil {
return "", protocol, 0, 0, fmt.Errorf("failed to parse port: %v", err)
}
if len(parts) > 2 {
var err error
portSpec := parts[2]
nodeProtocol, swarmPort, err := parsePortSpec(portSpec)
if err != nil {
return "", protocol, 0, 0, fmt.Errorf("failed to parse node port: %v", err)
}
if nodeProtocol != protocol {
return "", protocol, 0, 0, fmt.Errorf("protocol mismatch")
}
return name, protocol, port, swarmPort, nil
}
return name, protocol, port, 0, nil
}
func parsePortSpec(portSpec string) (api.PortConfig_Protocol, uint32, error) {
parts := strings.Split(portSpec, "/")
p := parts[0]
port, err := strconv.ParseUint(p, 10, 32)
if err != nil {
return 0, 0, err
}
if len(parts) > 1 {
proto := parts[1]
protocol, ok := api.PortConfig_Protocol_value[strings.ToUpper(proto)]
if !ok {
return 0, 0, fmt.Errorf("invalid protocol string: %s", proto)
}
return api.PortConfig_Protocol(protocol), uint32(port), nil
}
return api.ProtocolTCP, uint32(port), nil
}
func init() {
createCmd.Flags().String("name", "", "Service name")
createCmd.Flags().String("image", "", "Image")
createCmd.Flags().StringSlice("args", nil, "Args")
createCmd.Flags().StringSlice("env", nil, "Env")
createCmd.Flags().StringSlice("ports", nil, "Ports")
createCmd.Flags().StringP("file", "f", "", "Spec to use")
createCmd.Flags().String("network", "", "Network name")
// TODO(aluzzardi): This should be called `service-instances` so that every
// orchestrator can have its own flag namespace.
createCmd.Flags().String("mode", "replicated", "one of replicated, global")
createCmd.Flags().Uint64("instances", 1, "Number of instances for the service Service")
}