forked from TrueCloudLab/frostfs-node
[#316] locode/boltdb: Add option to enable read-only mode
Add ReadOnly function that returns Option that enables read-only mode in DB. RO mode can be used by processes that won't modify the DB in order to not acquire write flock. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
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2 changed files with 13 additions and 0 deletions
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@ -13,6 +13,8 @@ import (
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// Open opens underlying BoltDB instance.
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//
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// Timeout of BoltDB opening is 3s (only for Linux or Darwin).
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//
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// Opens BoltDB in read-only mode if DB is read-only.
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func (db *DB) Open() error {
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// copy-paste from metabase:
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// consider universal Open/Close for BoltDB wrappers
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@ -98,6 +100,7 @@ func recordFromValue(data []byte) (*locodedb.Record, error) {
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// The records are stored in internal binary JSON format.
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//
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// Must not be called before successful Open call.
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// Must not be called in read-only mode: behavior is undefined.
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func (db *DB) Put(key locodedb.Key, rec locodedb.Record) error {
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return db.bolt.Update(func(tx *bbolt.Tx) error {
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countryKey, err := countryBucketKey(key.CountryCode())
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@ -24,3 +24,13 @@ func defaultOpts() *options {
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},
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}
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}
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// ReadOnly enables read-only mode of the DB.
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//
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// Do not call DB.Put method on instances with
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// this option: the behavior is undefined.
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func ReadOnly() Option {
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return func(o *options) {
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o.boltOpts.ReadOnly = true
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}
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}
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