49 lines
1.9 KiB
Go
49 lines
1.9 KiB
Go
package storage
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import (
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"io"
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"github.com/coreos/etcd/storage/storagepb"
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)
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type KV interface {
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// Range gets the keys in the range at rangeRev.
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// If rangeRev <=0, range gets the keys at currentRev.
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// If `end` is nil, the request returns the key.
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// If `end` is not nil, it gets the keys in range [key, range_end).
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// Limit limits the number of keys returned.
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// If the required rev is compacted, ErrCompacted will be returned.
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Range(key, end []byte, limit, rangeRev int64) (kvs []storagepb.KeyValue, rev int64, err error)
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// Put puts the given key,value into the store.
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// A put also increases the rev of the store, and generates one event in the event history.
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Put(key, value []byte) (rev int64)
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// DeleteRange deletes the given range from the store.
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// A deleteRange increases the rev of the store if any key in the range exists.
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// The number of key deleted will be returned.
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// It also generates one event for each key delete in the event history.
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// if the `end` is nil, deleteRange deletes the key.
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// if the `end` is not nil, deleteRange deletes the keys in range [key, range_end).
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DeleteRange(key, end []byte) (n, rev int64)
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// TxnBegin begins a txn. Only Txn prefixed operation can be executed, others will be blocked
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// until txn ends. Only one on-going txn is allowed.
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// TxnBegin returns an int64 txn ID.
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// All txn prefixed operations with same txn ID will be done with the same rev.
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TxnBegin() int64
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// TxnEnd ends the on-going txn with txn ID. If the on-going txn ID is not matched, error is returned.
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TxnEnd(txnID int64) error
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TxnRange(txnID int64, key, end []byte, limit, rangeRev int64) (kvs []storagepb.KeyValue, rev int64, err error)
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TxnPut(txnID int64, key, value []byte) (rev int64, err error)
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TxnDeleteRange(txnID int64, key, end []byte) (n, rev int64, err error)
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Compact(rev int64) error
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// Write a snapshot to the given io writer
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Snapshot(w io.Writer) (int64, error)
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Restore() error
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Close() error
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}
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