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88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package cluster
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import (
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"log"
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"os"
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"time"
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"github.com/rqlite/rqlite/v8/cluster/proto"
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command "github.com/rqlite/rqlite/v8/command/proto"
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)
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const (
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removeRetries = 5
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removeDelay = 250 * time.Millisecond
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)
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// Control is an interface for interacting with a cluster.
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type Control interface {
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WaitForLeader(time.Duration) (string, error)
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WaitForRemoval(string, time.Duration) error
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}
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// Remover executes a node-removal operation.
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type Remover struct {
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timeout time.Duration
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control Control
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client *Client
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creds *proto.Credentials
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log *log.Logger
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}
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// / NewRemover returns an instantiated Remover.
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func NewRemover(client *Client, timeout time.Duration, control Control) *Remover {
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return &Remover{
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client: client,
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timeout: timeout,
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control: control,
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log: log.New(os.Stderr, "[cluster-remove] ", log.LstdFlags),
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}
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}
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// SetCredentials sets the credentials for the Remover.
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func (r *Remover) SetCredentials(creds *proto.Credentials) {
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r.creds = creds
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}
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// Do executes the node-removal operation.
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func (r *Remover) Do(id string, confirm bool) error {
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rn := &command.RemoveNodeRequest{
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Id: id,
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}
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nRetries := 0
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for {
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err := func() error {
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laddr, innerErr := r.control.WaitForLeader(r.timeout)
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if innerErr != nil {
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return innerErr
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}
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r.log.Printf("removing node %s from cluster via leader at %s", id, laddr)
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if innerErr = r.client.RemoveNode(rn, laddr, r.creds, r.timeout); innerErr != nil {
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r.log.Printf("failed to remove node %s from cluster via leader at %s: %s", id, laddr, innerErr)
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return innerErr
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}
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return nil
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}()
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if err == nil {
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break
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}
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nRetries++
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if nRetries == removeRetries {
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return err
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}
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time.Sleep(removeDelay)
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}
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if confirm {
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if err := r.control.WaitForRemoval(id, r.timeout); err != nil {
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return err
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}
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}
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return nil
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}
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