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|
package influxdb
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
)
const (
nodeFile = "node.json"
oldNodeFile = "id"
peersFilename = "peers.json"
)
type Node struct {
path string
ID uint64
}
// LoadNode will load the node information from disk if present
func LoadNode(path string) (*Node, error) {
// Always check to see if we are upgrading first
if err := upgradeNodeFile(path); err != nil {
return nil, err
}
n := &Node{
path: path,
}
f, err := os.Open(filepath.Join(path, nodeFile))
if err != nil {
return nil, err
}
defer f.Close()
if err := json.NewDecoder(f).Decode(n); err != nil {
return nil, err
}
return n, nil
}
// NewNode will return a new node
func NewNode(path string) *Node {
return &Node{
path: path,
}
}
// Save will save the node file to disk and replace the existing one if present
func (n *Node) Save() error {
file := filepath.Join(n.path, nodeFile)
tmpFile := file + "tmp"
f, err := os.Create(tmpFile)
if err != nil {
return err
}
if err = json.NewEncoder(f).Encode(n); err != nil {
f.Close()
return err
}
if err = f.Close(); nil != err {
return err
}
return os.Rename(tmpFile, file)
}
func upgradeNodeFile(path string) error {
oldFile := filepath.Join(path, oldNodeFile)
b, err := ioutil.ReadFile(oldFile)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
// We shouldn't have an empty ID file, but if we do, ignore it
if len(b) == 0 {
return nil
}
peers := []string{}
pb, err := ioutil.ReadFile(filepath.Join(path, peersFilename))
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
err = json.Unmarshal(pb, &peers)
if len(peers) > 1 {
return fmt.Errorf("to upgrade a cluster, please contact support at influxdata")
}
n := &Node{
path: path,
}
if n.ID, err = strconv.ParseUint(string(b), 10, 64); err != nil {
return err
}
if err := n.Save(); err != nil {
return err
}
if err := os.Remove(oldFile); err != nil {
return err
}
return nil
}
|
