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exec.go
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exec.go
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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"github.com/fatih/color"
"github.com/joomcode/errorx"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/cluster/meta"
"github.com/pingcap/tiup/pkg/cluster/task"
"github.com/pingcap/tiup/pkg/logger"
"github.com/pingcap/tiup/pkg/logger/log"
"github.com/pingcap/tiup/pkg/set"
tiuputils "github.com/pingcap/tiup/pkg/utils"
"github.com/spf13/cobra"
)
type execOptions struct {
command string
sudo bool
}
func newExecCmd() *cobra.Command {
opt := execOptions{}
cmd := &cobra.Command{
Use: "exec <cluster-name>",
Short: "Run shell command on host in the dm cluster",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
return cmd.Help()
}
clusterName := args[0]
if tiuputils.IsNotExist(meta.ClusterPath(clusterName, meta.MetaFileName)) {
return errors.Errorf("cannot execute command on non-exists cluster %s", clusterName)
}
logger.EnableAuditLog()
metadata, err := meta.DMMetadata(clusterName)
if err != nil {
return err
}
filterRoles := set.NewStringSet(gOpt.Roles...)
filterNodes := set.NewStringSet(gOpt.Nodes...)
var shellTasks []task.Task
uniqueHosts := map[string]int{} // host -> ssh-port
metadata.Topology.IterInstance(func(inst meta.Instance) {
if _, found := uniqueHosts[inst.GetHost()]; !found {
if len(gOpt.Roles) > 0 && !filterRoles.Exist(inst.Role()) {
return
}
if len(gOpt.Nodes) > 0 && !filterNodes.Exist(inst.GetHost()) {
return
}
uniqueHosts[inst.GetHost()] = inst.GetSSHPort()
}
})
for host := range uniqueHosts {
shellTasks = append(shellTasks,
task.NewBuilder().
Shell(host, opt.command, opt.sudo).
Build())
}
t := task.NewBuilder().
SSHKeySet(
meta.ClusterPath(clusterName, "ssh", "id_rsa"),
meta.ClusterPath(clusterName, "ssh", "id_rsa.pub")).
ClusterSSH(metadata.Topology, metadata.User, gOpt.SSHTimeout).
Parallel(shellTasks...).
Build()
execCtx := task.NewContext()
if err := t.Execute(execCtx); err != nil {
if errorx.Cast(err) != nil {
// FIXME: Map possible task errors and give suggestions.
return err
}
return errors.Trace(err)
}
// print outputs
for host := range uniqueHosts {
stdout, stderr, ok := execCtx.GetOutputs(host)
if !ok {
continue
}
log.Infof("Outputs of %s on %s:",
color.CyanString(opt.command),
color.CyanString(host))
if len(stdout) > 0 {
log.Infof("%s:\n%s", color.GreenString("stdout"), stdout)
}
if len(stderr) > 0 {
log.Infof("%s:\n%s", color.RedString("stderr"), stderr)
}
}
return nil
},
}
cmd.Flags().StringVar(&opt.command, "command", "ls", "the command run on cluster host")
cmd.Flags().BoolVar(&opt.sudo, "sudo", false, "use root permissions (default false)")
cmd.Flags().StringSliceVarP(&gOpt.Roles, "role", "R", nil, "Only exec on host with specified roles")
cmd.Flags().StringSliceVarP(&gOpt.Nodes, "node", "N", nil, "Only exec on host with specified nodes")
return cmd
}