lotus/node/config/storage.go

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package config
import (
"encoding/json"
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"github.com/filecoin-project/sector-storage/stores"
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"io"
"io/ioutil"
"os"
"golang.org/x/xerrors"
)
func StorageFromFile(path string, def *stores.StorageConfig) (*stores.StorageConfig, error) {
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file, err := os.Open(path)
switch {
case os.IsNotExist(err):
if def == nil {
return nil, xerrors.Errorf("couldn't load storage config: %w", err)
}
return def, nil
case err != nil:
return nil, err
}
defer file.Close() //nolint:errcheck // The file is RO
return StorageFromReader(file)
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}
func StorageFromReader(reader io.Reader) (*stores.StorageConfig, error) {
var cfg stores.StorageConfig
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err := json.NewDecoder(reader).Decode(&cfg)
if err != nil {
return nil, err
}
return &cfg, nil
}
func WriteStorageFile(path string, config stores.StorageConfig) error {
b, err := json.MarshalIndent(config, "", " ")
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if err != nil {
return xerrors.Errorf("marshaling storage config: %w", err)
}
if err := ioutil.WriteFile(path, b, 0644); err != nil {
return xerrors.Errorf("persisting storage config (%s): %w", path, err)
}
return nil
}