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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// TnxBegin begins a tnx. Only Tnx prefixed operation can be executed, others will be blocked
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// until tnx ends. Only one on-going tnx is allowed.
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// TnxBegin returns an int64 tnx ID.
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// All tnx prefixed operations with same tnx ID will be done with the same rev.
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TnxBegin() int64
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// TnxEnd ends the on-going tnx with tnx ID. If the on-going tnx ID is not matched, error is returned.
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TnxEnd(tnxID int64) error
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TnxRange(tnxID int64, key, end []byte, limit, rangeRev int64) (kvs []storagepb.KeyValue, rev int64, err error)
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TnxPut(tnxID int64, key, value []byte) (rev int64, err error)
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TnxDeleteRange(tnxID 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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