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metadata.go
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metadata.go
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//
// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package metadata provides agent metadata structs and info.
package metadata
import (
"io/fs"
"os"
"github.com/vdaas/vald/internal/encoding/json"
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/file"
"github.com/vdaas/vald/internal/io"
)
const (
AgentMetadataFileName = "metadata.json"
)
type Metadata struct {
IsInvalid bool `json:"is_invalid" yaml:"is_invalid"`
NGT *NGT `json:"ngt,omitempty" yaml:"ngt"`
}
type NGT struct {
IndexCount uint64 `json:"index_count" yaml:"index_count"`
}
func Load(path string) (meta *Metadata, err error) {
var fi os.FileInfo
exists, fi, err := file.ExistsWithDetail(path)
switch {
case !exists:
return nil, errors.ErrMetadataFileNotFound
case err != nil:
return nil, err
case fi == nil || fi.Size() == 0:
return nil, errors.ErrMetadataFileEmpty
}
f, err := file.Open(path, os.O_RDONLY|os.O_SYNC, fs.ModePerm)
if err != nil {
return nil, err
}
defer func() {
if f != nil {
derr := f.Close()
if derr != nil {
err = errors.Wrap(err, derr.Error())
}
}
}()
err = json.Decode(f, &meta)
if err != nil && err != io.EOF {
return nil, err
}
return meta, nil
}
func Store(path string, meta *Metadata) (err error) {
var f *os.File
f, err = file.Open(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
if err != nil {
return err
}
defer func() {
if f != nil {
derr := f.Close()
if derr != nil {
err = errors.Wrap(err, derr.Error())
}
}
}()
err = json.Encode(f, &meta)
if err != nil {
return err
}
err = f.Sync()
if err != nil {
return err
}
return nil
}