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init.go
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init.go
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package config
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/ghodss/yaml"
"github.com/pkg/errors"
)
// Init holds all information needed to initialize a server.
type Init struct {
Address string
Cluster []string
}
var initialFilenames = []string{
"init.yaml",
"cluster.key",
"cluster.crt",
"failure-domain",
}
// Load init.yaml if present, or return nil otherwise.
func loadInit(dir string) (*Init, error) {
path := filepath.Join(dir, "init.yaml")
if _, err := os.Stat(path); err != nil {
if !os.IsNotExist(err) {
return nil, errors.Wrap(err, "check if init.yaml exists")
}
return nil, nil
}
// Check that the only files in the directory are the TLS certificate.
files, err := ioutil.ReadDir(dir)
if err != nil {
return nil, errors.Wrap(err, "list data directory")
}
for _, file := range files {
expected := false
for _, filename := range initialFilenames {
if filename == file.Name() {
expected = true
break
}
}
if !expected {
return nil, fmt.Errorf("data directory seems to have existing state: %s", file.Name())
}
}
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, errors.Wrap(err, "read init.yaml")
}
init := &Init{}
if err := yaml.Unmarshal(data, init); err != nil {
return nil, errors.Wrap(err, "parse init.yaml")
}
if init.Address == "" {
return nil, fmt.Errorf("server address is empty")
}
return init, nil
}