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node_drain.go
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node_drain.go
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package omcmd
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"sync"
"github.com/opensvc/om3/core/client"
"github.com/opensvc/om3/core/clientcontext"
"github.com/opensvc/om3/core/monitor"
"github.com/opensvc/om3/core/nodeaction"
"github.com/opensvc/om3/core/nodeselector"
"github.com/opensvc/om3/util/hostname"
)
type CmdNodeDrain struct {
OptsGlobal
OptsAsync
NodeSelector string
}
func (t *CmdNodeDrain) Run() error {
if t.Local {
t.NodeSelector = hostname.Hostname()
}
if !clientcontext.IsSet() && t.NodeSelector == "" {
t.NodeSelector = hostname.Hostname()
}
if t.NodeSelector == "" {
return fmt.Errorf("--node must be specified")
}
return t.doRemote()
}
func (t *CmdNodeDrain) doRemote() error {
c, err := client.New(client.WithURL(t.Server))
if err != nil {
return err
}
nodenames, err := nodeselector.New(t.NodeSelector, nodeselector.WithClient(c)).Expand()
if err != nil {
return err
}
errC := make(chan error)
for _, nodename := range nodenames {
go func(nodename string) {
err := nodeaction.New(
nodeaction.WithAsyncTarget("drained"),
nodeaction.WithAsyncTime(t.Time),
nodeaction.WithAsyncWait(t.Wait),
nodeaction.WithAsyncWaitNode(nodename),
nodeaction.WithFormat(t.Output),
nodeaction.WithColor(t.Color),
nodeaction.WithAsyncFunc(func(ctx context.Context) error {
if resp, err := c.PostPeerActionDrainWithResponse(ctx, nodename); err != nil {
return err
} else {
switch resp.StatusCode() {
case http.StatusOK:
fmt.Printf("%s: %s\n", nodename, *resp.JSON200)
case 400:
return fmt.Errorf("%s: %s", nodename, *resp.JSON400)
case 401:
return fmt.Errorf("%s: %s", nodename, *resp.JSON401)
case 403:
return fmt.Errorf("%s: %s", nodename, *resp.JSON403)
case 408:
return fmt.Errorf("%s: %s", nodename, *resp.JSON408)
case 409:
return fmt.Errorf("%s: %s", nodename, *resp.JSON409)
case 500:
return fmt.Errorf("%s: %s", nodename, *resp.JSON500)
default:
return fmt.Errorf("%s: unexpected status [%d]", nodename, resp.StatusCode())
}
}
return nil
}),
).Do()
errC <- err
}(nodename)
}
var (
errs error
count int
wg sync.WaitGroup
)
if t.Watch {
wg.Add(1)
go func() {
defer wg.Done()
m := monitor.New()
m.SetColor(t.Color)
m.SetFormat(t.Output)
m.SetSelector(t.ObjectSelector)
cli, e := client.New(client.WithURL(t.Server), client.WithTimeout(0))
if e != nil {
_, _ = fmt.Fprintln(os.Stderr, e)
return
}
statusGetter := cli.NewGetDaemonStatus().SetSelector(t.ObjectSelector)
evReader, err := cli.NewGetEvents().SetSelector(t.ObjectSelector).GetReader()
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, err)
return
}
err = m.DoWatch(statusGetter, evReader, os.Stdout)
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, err)
return
}
}()
}
for {
err := <-errC
errs = errors.Join(errs, err)
count++
if count == len(nodenames) {
break
}
}
wg.Wait()
return errs
}