102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
package framework
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import (
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"context"
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"encoding/json"
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"strings"
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"time"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/vault/helper/jsonutil"
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"github.com/hashicorp/vault/logical"
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)
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// WALPrefix is the prefix within Storage where WAL entries will be written.
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const WALPrefix = "wal/"
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type WALEntry struct {
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ID string `json:"-"`
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Kind string `json:"type"`
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Data interface{} `json:"data"`
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CreatedAt int64 `json:"created_at"`
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}
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// PutWAL writes some data to the WAL.
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//
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// The kind parameter is used by the framework to allow users to store
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// multiple kinds of WAL data and to easily disambiguate what data they're
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// expecting.
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//
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// Data within the WAL that is uncommitted (CommitWAL hasn't be called)
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// will be given to the rollback callback when an rollback operation is
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// received, allowing the backend to clean up some partial states.
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//
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// The data must be JSON encodable.
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//
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// This returns a unique ID that can be used to reference this WAL data.
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// WAL data cannot be modified. You can only add to the WAL and commit existing
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// WAL entries.
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func PutWAL(ctx context.Context, s logical.Storage, kind string, data interface{}) (string, error) {
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value, err := json.Marshal(&WALEntry{
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Kind: kind,
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Data: data,
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CreatedAt: time.Now().UTC().Unix(),
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})
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if err != nil {
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return "", err
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}
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id, err := uuid.GenerateUUID()
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if err != nil {
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return "", err
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}
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return id, s.Put(ctx, &logical.StorageEntry{
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Key: WALPrefix + id,
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Value: value,
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})
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}
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// GetWAL reads a specific entry from the WAL. If the entry doesn't exist,
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// then nil value is returned.
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//
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// The kind, value, and error are returned.
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func GetWAL(ctx context.Context, s logical.Storage, id string) (*WALEntry, error) {
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entry, err := s.Get(ctx, WALPrefix+id)
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if err != nil {
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return nil, err
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}
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if entry == nil {
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return nil, nil
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}
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var raw WALEntry
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if err := jsonutil.DecodeJSON(entry.Value, &raw); err != nil {
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return nil, err
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}
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raw.ID = id
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return &raw, nil
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}
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// DeleteWAL commits the WAL entry with the given ID. Once committed,
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// it is assumed that the operation was a success and doesn't need to
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// be rolled back.
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func DeleteWAL(ctx context.Context, s logical.Storage, id string) error {
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return s.Delete(ctx, WALPrefix+id)
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}
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// ListWAL lists all the entries in the WAL.
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func ListWAL(ctx context.Context, s logical.Storage) ([]string, error) {
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keys, err := s.List(ctx, WALPrefix)
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if err != nil {
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return nil, err
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}
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for i, k := range keys {
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keys[i] = strings.TrimPrefix(k, WALPrefix)
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}
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return keys, nil
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}
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