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cli_capture_list.go
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cli_capture_list.go
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// Copyright 2021 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 cli
import (
"context"
"github.com/pingcap/errors"
"github.com/spf13/cobra"
cmdcontext "github.com/tikv/migration/cdc/pkg/cmd/context"
"github.com/tikv/migration/cdc/pkg/cmd/factory"
"github.com/tikv/migration/cdc/pkg/cmd/util"
cerror "github.com/tikv/migration/cdc/pkg/errors"
"github.com/tikv/migration/cdc/pkg/etcd"
"go.etcd.io/etcd/client/v3/concurrency"
)
// capture holds capture information.
type capture struct {
ID string `json:"id"`
IsOwner bool `json:"is-owner"`
AdvertiseAddr string `json:"address"`
}
// listCaptureOptions defines flags for the `cli capture list` command.
type listCaptureOptions struct {
etcdClient *etcd.CDCEtcdClient
}
// newListCaptureOptions creates new listCaptureOptions for the `cli capture list` command.
func newListCaptureOptions() *listCaptureOptions {
return &listCaptureOptions{}
}
// complete adapts from the command line args to the data and client required.
func (o *listCaptureOptions) complete(f factory.Factory) error {
etcdClient, err := f.EtcdClient()
if err != nil {
return err
}
o.etcdClient = etcdClient
return nil
}
// run runs the `cli capture list` command.
func (o *listCaptureOptions) run(cmd *cobra.Command) error {
ctx := cmdcontext.GetDefaultContext()
captures, err := listCaptures(ctx, o.etcdClient)
if err != nil {
return err
}
return util.JSONPrint(cmd, captures)
}
// newCmdListCapture creates the `cli capture list` command.
func newCmdListCapture(f factory.Factory) *cobra.Command {
o := newListCaptureOptions()
command := &cobra.Command{
Use: "list",
Short: "List all captures in TiCDC cluster",
Args: cobra.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
err := o.complete(f)
if err != nil {
return err
}
return o.run(cmd)
},
}
return command
}
// listCaptures list all the captures from the etcd.
func listCaptures(ctx context.Context, etcdClient *etcd.CDCEtcdClient) ([]*capture, error) {
_, raw, err := etcdClient.GetCaptures(ctx)
if err != nil {
return nil, err
}
ownerID, err := etcdClient.GetOwnerID(ctx, etcd.CaptureOwnerKey)
if err != nil && errors.Cause(err) != concurrency.ErrElectionNoLeader {
return nil, err
}
captures := make([]*capture, 0, len(raw))
for _, c := range raw {
isOwner := c.ID == ownerID
captures = append(captures,
&capture{ID: c.ID, IsOwner: isOwner, AdvertiseAddr: c.AdvertiseAddr})
}
return captures, nil
}
// getOwnerCapture returns the owner capture.
func getOwnerCapture(ctx context.Context, etcdClient *etcd.CDCEtcdClient) (*capture, error) {
captures, err := listCaptures(ctx, etcdClient)
if err != nil {
return nil, err
}
for _, c := range captures {
if c.IsOwner {
return c, nil
}
}
return nil, errors.Trace(cerror.ErrOwnerNotFound)
}