[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/mvcc/kv.go b/vendor/github.com/coreos/etcd/mvcc/kv.go
new file mode 100644
index 0000000..2dad3ad
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/mvcc/kv.go
@@ -0,0 +1,149 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mvcc
+
+import (
+ "github.com/coreos/etcd/lease"
+ "github.com/coreos/etcd/mvcc/backend"
+ "github.com/coreos/etcd/mvcc/mvccpb"
+)
+
+type RangeOptions struct {
+ Limit int64
+ Rev int64
+ Count bool
+}
+
+type RangeResult struct {
+ KVs []mvccpb.KeyValue
+ Rev int64
+ Count int
+}
+
+type ReadView interface {
+ // FirstRev returns the first KV revision at the time of opening the txn.
+ // After a compaction, the first revision increases to the compaction
+ // revision.
+ FirstRev() int64
+
+ // Rev returns the revision of the KV at the time of opening the txn.
+ Rev() int64
+
+ // Range gets the keys in the range at rangeRev.
+ // The returned rev is the current revision of the KV when the operation is executed.
+ // If rangeRev <=0, range gets the keys at currentRev.
+ // If `end` is nil, the request returns the key.
+ // If `end` is not nil and not empty, it gets the keys in range [key, range_end).
+ // If `end` is not nil and empty, it gets the keys greater than or equal to key.
+ // Limit limits the number of keys returned.
+ // If the required rev is compacted, ErrCompacted will be returned.
+ Range(key, end []byte, ro RangeOptions) (r *RangeResult, err error)
+}
+
+// TxnRead represents a read-only transaction with operations that will not
+// block other read transactions.
+type TxnRead interface {
+ ReadView
+ // End marks the transaction is complete and ready to commit.
+ End()
+}
+
+type WriteView interface {
+ // DeleteRange deletes the given range from the store.
+ // A deleteRange increases the rev of the store if any key in the range exists.
+ // The number of key deleted will be returned.
+ // The returned rev is the current revision of the KV when the operation is executed.
+ // It also generates one event for each key delete in the event history.
+ // if the `end` is nil, deleteRange deletes the key.
+ // if the `end` is not nil, deleteRange deletes the keys in range [key, range_end).
+ DeleteRange(key, end []byte) (n, rev int64)
+
+ // Put puts the given key, value into the store. Put also takes additional argument lease to
+ // attach a lease to a key-value pair as meta-data. KV implementation does not validate the lease
+ // id.
+ // A put also increases the rev of the store, and generates one event in the event history.
+ // The returned rev is the current revision of the KV when the operation is executed.
+ Put(key, value []byte, lease lease.LeaseID) (rev int64)
+}
+
+// TxnWrite represents a transaction that can modify the store.
+type TxnWrite interface {
+ TxnRead
+ WriteView
+ // Changes gets the changes made since opening the write txn.
+ Changes() []mvccpb.KeyValue
+}
+
+// txnReadWrite coerces a read txn to a write, panicking on any write operation.
+type txnReadWrite struct{ TxnRead }
+
+func (trw *txnReadWrite) DeleteRange(key, end []byte) (n, rev int64) { panic("unexpected DeleteRange") }
+func (trw *txnReadWrite) Put(key, value []byte, lease lease.LeaseID) (rev int64) {
+ panic("unexpected Put")
+}
+func (trw *txnReadWrite) Changes() []mvccpb.KeyValue { return nil }
+
+func NewReadOnlyTxnWrite(txn TxnRead) TxnWrite { return &txnReadWrite{txn} }
+
+type KV interface {
+ ReadView
+ WriteView
+
+ // Read creates a read transaction.
+ Read() TxnRead
+
+ // Write creates a write transaction.
+ Write() TxnWrite
+
+ // Hash computes the hash of the KV's backend.
+ Hash() (hash uint32, revision int64, err error)
+
+ // HashByRev computes the hash of all MVCC revisions up to a given revision.
+ HashByRev(rev int64) (hash uint32, revision int64, compactRev int64, err error)
+
+ // Compact frees all superseded keys with revisions less than rev.
+ Compact(rev int64) (<-chan struct{}, error)
+
+ // Commit commits outstanding txns into the underlying backend.
+ Commit()
+
+ // Restore restores the KV store from a backend.
+ Restore(b backend.Backend) error
+ Close() error
+}
+
+// WatchableKV is a KV that can be watched.
+type WatchableKV interface {
+ KV
+ Watchable
+}
+
+// Watchable is the interface that wraps the NewWatchStream function.
+type Watchable interface {
+ // NewWatchStream returns a WatchStream that can be used to
+ // watch events happened or happening on the KV.
+ NewWatchStream() WatchStream
+}
+
+// ConsistentWatchableKV is a WatchableKV that understands the consistency
+// algorithm and consistent index.
+// If the consistent index of executing entry is not larger than the
+// consistent index of ConsistentWatchableKV, all operations in
+// this entry are skipped and return empty response.
+type ConsistentWatchableKV interface {
+ WatchableKV
+ // ConsistentIndex returns the current consistent index of the KV.
+ ConsistentIndex() uint64
+}