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cluster_dm.go
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cluster_dm.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 meta
import (
"io/ioutil"
"os"
"github.com/joomcode/errorx"
"github.com/pingcap/errors"
"gopkg.in/yaml.v2"
)
// DMMeta is the specification of generic cluster metadata
type DMMeta struct {
User string `yaml:"user"` // the user to run and manage cluster on remote
Version string `yaml:"dm_version"` // the version of TiDB cluster
//EnableTLS bool `yaml:"enable_tls"`
//EnableFirewall bool `yaml:"firewall"`
Topology *DMTopologySpecification `yaml:"topology"`
}
// SaveDMMeta saves the cluster meta information to profile directory
func SaveDMMeta(clusterName string, meta *DMMeta) error {
wrapError := func(err error) *errorx.Error {
return ErrClusterSaveMetaFailed.Wrap(err, "Failed to save dm metadata")
}
metaFile := ClusterPath(clusterName, MetaFileName)
if err := EnsureClusterDir(clusterName); err != nil {
return wrapError(err)
}
f, err := os.OpenFile(metaFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, os.ModePerm)
if err != nil {
return wrapError(err)
}
defer f.Close()
if err := yaml.NewEncoder(f).Encode(meta); err != nil {
return wrapError(err)
}
return nil
}
// DMMetadata tries to read the metadata of a cluster from file
func DMMetadata(clusterName string) (*DMMeta, error) {
var cm DMMeta
topoFile := ClusterPath(clusterName, MetaFileName)
yamlFile, err := ioutil.ReadFile(topoFile)
if err != nil {
return nil, errors.Trace(err)
}
if err = yaml.Unmarshal(yamlFile, &cm); err != nil {
return nil, errors.Trace(err)
}
return &cm, nil
}