58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package config
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"github.com/BurntSushi/toml"
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"github.com/kelseyhightower/envconfig"
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"golang.org/x/xerrors"
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)
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// FromFile loads config from a specified file overriding defaults specified in
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// the def parameter. If file does not exist or is empty defaults are asummed.
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func FromFile(path string, def interface{}) (interface{}, error) {
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file, err := os.Open(path)
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switch {
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case os.IsNotExist(err):
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return def, nil
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case err != nil:
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return nil, err
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}
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defer file.Close() //nolint:errcheck // The file is RO
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return FromReader(file, def)
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}
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// FromReader loads config from a reader instance.
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func FromReader(reader io.Reader, def interface{}) (interface{}, error) {
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cfg := def
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_, err := toml.DecodeReader(reader, cfg)
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if err != nil {
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return nil, err
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}
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err = envconfig.Process("LOTUS", cfg)
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if err != nil {
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return nil, fmt.Errorf("processing env vars overrides: %s", err)
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}
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return cfg, nil
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}
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func ConfigComment(t interface{}) ([]byte, error) {
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buf := new(bytes.Buffer)
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_, _ = buf.WriteString("# Default config:\n")
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e := toml.NewEncoder(buf)
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if err := e.Encode(t); err != nil {
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return nil, xerrors.Errorf("encoding config: %w", err)
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}
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b := buf.Bytes()
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b = bytes.ReplaceAll(b, []byte("\n"), []byte("\n#"))
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b = bytes.ReplaceAll(b, []byte("#["), []byte("["))
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return b, nil
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}
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