alibaba/kt-connect

package command

import (
    "fmt"
    "github.com/alibaba/kt-connect/pkg/kt/command/general"
    "github.com/alibaba/kt-connect/pkg/kt/command/mesh"
    opt "github.com/alibaba/kt-connect/pkg/kt/command/options"
    "github.com/alibaba/kt-connect/pkg/kt/util"
    "github.com/rs/zerolog/log"
    "github.com/spf13/cobra"
    "strings"
)

// NewMeshCommand return new mesh command
func NewMeshCommand() *cobra.Command {
    cmd := &cobra.Command{
        Use:  "mesh",
        Short: "Redirect marked requests of specified kubernetes service to local",
        PreRunE: func(cmd *cobra.Command, args []string) error {
            if len(args) == 0 {
                return fmt.Errorf("name of service to mesh is required")
            } else if len(args) > 1 {
                return fmt.Errorf("too many service names are spcified (%s), should be one", strings.Join(args, ",") )
            }
            return general.Prepare()
        },
        RunE: func(cmd *cobra.Command, args []string) error {
            return Mesh(args[0])
        },
        Example: "ktctl mesh <service-name> [command options]",
    }

    cmd.SetUsageTemplate(general.UsageTemplate(true))
    opt.SetOptions(cmd, cmd.Flags(), opt.Get().Mesh, opt.MeshFlags())
    return cmd
}

//Mesh exchange kubernetes workload
func Mesh(resourceName string) error {
    ch, err := general.SetupProcess(util.ComponentMesh)
    if err != nil {
        return err
    }

    if opt.Get().Mesh.SkipPortChecking {
        if port := util.FindBrokenLocalPort(opt.Get().Mesh.Expose); port != "" {
            return fmt.Errorf("no application is running on port %s", port)
        }
    }

  // Get service to mesh
    svc, err := general.GetServiceByResourceName(resourceName, opt.Get().Global.Namespace)
    if err != nil {
        return err
    }

    if port := util.FindInvalidRemotePort(opt.Get().Mesh.Expose, general.GetTargetPorts(svc)); port != "" {
        return fmt.Errorf("target port %s not exists in service %s", port, svc.Name)
    }

    log.Info().Msgf("Using %s mode", opt.Get().Mesh.Mode)
    if opt.Get().Mesh.Mode == util.MeshModeManual {
        err = mesh.ManualMesh(svc)
    } else if opt.Get().Mesh.Mode == util.MeshModeAuto {
        err = mesh.AutoMesh(svc)
    } else {
        err = fmt.Errorf("invalid mesh method '%s', supportted are %s, %s", opt.Get().Mesh.Mode,
            util.MeshModeAuto, util.MeshModeManual)
    }
    if err != nil {
        return err
    }

    // watch background process, clean the workspace and exit if background process occur exception
    s := <-ch
    log.Info().Msgf("Terminal Signal is %s", s)
    return nil
}