Golang storage.KV类代码示例

func doDeleteRange(kv dstorage.KV, dr *pb.DeleteRangeRequest) *pb.DeleteRangeResponse {
	resp := &pb.DeleteRangeResponse{}
	resp.Header = &pb.ResponseHeader{}
	_, rev := kv.DeleteRange(dr.Key, dr.RangeEnd)
	resp.Header.Index = rev
	return resp
}

func applyPut(kv dstorage.KV, p *pb.PutRequest) (*pb.PutResponse, error) {
	resp := &pb.PutResponse{}
	resp.Header = &pb.ResponseHeader{}
	rev := kv.Put(p.Key, p.Value)
	resp.Header.Revision = rev
	return resp, nil
}

func doPut(kv dstorage.KV, p *pb.PutRequest) *pb.PutResponse {
	resp := &pb.PutResponse{}
	resp.Header = &pb.ResponseHeader{}
	rev := kv.Put(p.Key, p.Value)
	resp.Header.Index = rev
	return resp
}

func applyRange(txnID int64, kv dstorage.KV, r *pb.RangeRequest) (*pb.RangeResponse, error) {
	resp := &pb.RangeResponse{}
	resp.Header = &pb.ResponseHeader{}

	var (
		kvs []storagepb.KeyValue
		rev int64
		err error
	)

	if txnID != noTxn {
		kvs, rev, err = kv.TxnRange(txnID, r.Key, r.RangeEnd, r.Limit, 0)
		if err != nil {
			return nil, err
		}
	} else {
		kvs, rev, err = kv.Range(r.Key, r.RangeEnd, r.Limit, 0)
		if err != nil {
			return nil, err
		}
	}

	resp.Header.Revision = rev
	for i := range kvs {
		resp.Kvs = append(resp.Kvs, &kvs[i])
	}
	return resp, nil
}

func applyDeleteRange(kv dstorage.KV, dr *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
	resp := &pb.DeleteRangeResponse{}
	resp.Header = &pb.ResponseHeader{}
	_, rev := kv.DeleteRange(dr.Key, dr.RangeEnd)
	resp.Header.Revision = rev
	return resp, nil
}

func applyDeleteRange(txnID int64, kv dstorage.KV, dr *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
	resp := &pb.DeleteRangeResponse{}
	resp.Header = &pb.ResponseHeader{}

	var (
		n   int64
		rev int64
		err error
	)

	if isGteRange(dr.RangeEnd) {
		dr.RangeEnd = []byte{}
	}

	if txnID != noTxn {
		n, rev, err = kv.TxnDeleteRange(txnID, dr.Key, dr.RangeEnd)
		if err != nil {
			return nil, err
		}
	} else {
		n, rev = kv.DeleteRange(dr.Key, dr.RangeEnd)
	}

	resp.Deleted = n
	resp.Header.Revision = rev
	return resp, nil
}

func applyRange(txnID int64, kv dstorage.KV, r *pb.RangeRequest) (*pb.RangeResponse, error) {
	resp := &pb.RangeResponse{}
	resp.Header = &pb.ResponseHeader{}

	var (
		kvs []storagepb.KeyValue
		rev int64
		err error
	)

	limit := r.Limit
	if r.SortOrder != pb.RangeRequest_NONE {
		// fetch everything; sort and truncate afterwards
		limit = 0
	}

	if txnID != noTxn {
		kvs, rev, err = kv.TxnRange(txnID, r.Key, r.RangeEnd, limit, 0)
		if err != nil {
			return nil, err
		}
	} else {
		kvs, rev, err = kv.Range(r.Key, r.RangeEnd, limit, 0)
		if err != nil {
			return nil, err
		}
	}

	if r.SortOrder != pb.RangeRequest_NONE {
		var sorter sort.Interface
		switch {
		case r.SortTarget == pb.RangeRequest_KEY:
			sorter = &kvSortByKey{&kvSort{kvs}}
		case r.SortTarget == pb.RangeRequest_VERSION:
			sorter = &kvSortByVersion{&kvSort{kvs}}
		case r.SortTarget == pb.RangeRequest_CREATE:
			sorter = &kvSortByCreate{&kvSort{kvs}}
		case r.SortTarget == pb.RangeRequest_MOD:
			sorter = &kvSortByMod{&kvSort{kvs}}
		case r.SortTarget == pb.RangeRequest_VALUE:
			sorter = &kvSortByValue{&kvSort{kvs}}
		}
		switch {
		case r.SortOrder == pb.RangeRequest_ASCEND:
			sort.Sort(sorter)
		case r.SortOrder == pb.RangeRequest_DESCEND:
			sort.Sort(sort.Reverse(sorter))
		}
		if r.Limit > 0 && len(kvs) > int(r.Limit) {
			kvs = kvs[:r.Limit]
		}
	}

	resp.Header.Revision = rev
	for i := range kvs {
		resp.Kvs = append(resp.Kvs, &kvs[i])
	}
	return resp, nil
}

// applyCompare applies the compare request.
// applyCompare should only be called within a txn request and an valid txn ID must
// be presented. Or applyCompare panics.
// It returns the revision at which the comparison happens. If the comparison
// succeeds, the it returns true. Otherwise it returns false.
func applyCompare(txnID int64, kv dstorage.KV, c *pb.Compare) (int64, bool) {
	if txnID == noTxn {
		panic("applyCompare called with noTxn")
	}
	ckvs, rev, err := kv.TxnRange(txnID, c.Key, nil, 1, 0)
	if err != nil {
		if err == dstorage.ErrTxnIDMismatch {
			panic("unexpected txn ID mismatch error")
		}
		return rev, false
	}
	var ckv storagepb.KeyValue
	if len(ckvs) != 0 {
		ckv = ckvs[0]
	} else {
		// Use the zero value of ckv normally. However...
		if c.Target == pb.Compare_VALUE {
			// Always fail if we're comparing a value on a key that doesn't exist.
			// We can treat non-existence as the empty set explicitly, such that
			// even a key with a value of length 0 bytes is still a real key
			// that was written that way
			return rev, false
		}
	}

	// -1 is less, 0 is equal, 1 is greater
	var result int
	switch c.Target {
	case pb.Compare_VALUE:
		result = bytes.Compare(ckv.Value, c.Value)
	case pb.Compare_CREATE:
		result = compareInt64(ckv.CreateRevision, c.CreateRevision)
	case pb.Compare_MOD:
		result = compareInt64(ckv.ModRevision, c.ModRevision)
	case pb.Compare_VERSION:
		result = compareInt64(ckv.Version, c.Version)
	}

	switch c.Result {
	case pb.Compare_EQUAL:
		if result != 0 {
			return rev, false
		}
	case pb.Compare_GREATER:
		if result != 1 {
			return rev, false
		}
	case pb.Compare_LESS:
		if result != -1 {
			return rev, false
		}
	}
	return rev, true
}

func applyCompaction(kv dstorage.KV, compaction *pb.CompactionRequest) (*pb.CompactionResponse, error) {
	resp := &pb.CompactionResponse{}
	resp.Header = &pb.ResponseHeader{}
	err := kv.Compact(compaction.Revision)
	if err != nil {
		return nil, err
	}
	// get the current revision. which key to get is not important.
	_, resp.Header.Revision, _ = kv.Range([]byte("compaction"), nil, 1, 0)
	return resp, err
}

func doCompare(kv dstorage.KV, c *pb.Compare) (int64, bool) {
	ckvs, rev, err := kv.Range(c.Key, nil, 1, 0)
	if err != nil {
		return rev, false
	}
	var ckv storagepb.KeyValue
	if len(ckvs) != 0 {
		ckv = ckvs[0]
	}

	// -1 is less, 0 is equal, 1 is greater
	var result int
	switch c.Target {
	case pb.Compare_VALUE:
		tv, _ := c.TargetUnion.(*pb.Compare_Value)
		if tv != nil {
			result = bytes.Compare(ckv.Value, tv.Value)
		}
	case pb.Compare_CREATE:
		tv, _ := c.TargetUnion.(*pb.Compare_CreateRevision)
		if tv != nil {
			result = compareInt64(ckv.CreateRevision, tv.CreateRevision)
		}

	case pb.Compare_MOD:
		tv, _ := c.TargetUnion.(*pb.Compare_ModRevision)
		if tv != nil {
			result = compareInt64(ckv.ModRevision, tv.ModRevision)
		}
	case pb.Compare_VERSION:
		tv, _ := c.TargetUnion.(*pb.Compare_Version)
		if tv != nil {
			result = compareInt64(ckv.Version, tv.Version)
		}
	}

	switch c.Result {
	case pb.Compare_EQUAL:
		if result != 0 {
			return rev, false
		}
	case pb.Compare_GREATER:
		if result != 1 {
			return rev, false
		}
	case pb.Compare_LESS:
		if result != -1 {
			return rev, false
		}
	}
	return rev, true
}

func doRange(kv dstorage.KV, r *pb.RangeRequest) *pb.RangeResponse {
	resp := &pb.RangeResponse{}
	resp.Header = &pb.ResponseHeader{}
	kvs, rev, err := kv.Range(r.Key, r.RangeEnd, r.Limit, 0)
	if err != nil {
		panic("not handled error")
	}

	resp.Header.Index = rev
	for i := range kvs {
		resp.Kvs = append(resp.Kvs, &kvs[i])
	}
	return resp
}

func applyTxn(kv dstorage.KV, le lease.Lessor, rt *pb.TxnRequest) (*pb.TxnResponse, error) {
	var revision int64

	ok := true
	for _, c := range rt.Compare {
		if revision, ok = applyCompare(kv, c); !ok {
			break
		}
	}

	var reqs []*pb.RequestUnion
	if ok {
		reqs = rt.Success
	} else {
		reqs = rt.Failure
	}

	if err := checkRequestLeases(le, reqs); err != nil {
		return nil, err
	}
	if err := checkRequestRange(kv, reqs); err != nil {
		return nil, err
	}

	// When executing the operations of txn, we need to hold the txn lock.
	// So the reader will not see any intermediate results.
	txnID := kv.TxnBegin()
	defer func() {
		err := kv.TxnEnd(txnID)
		if err != nil {
			panic(fmt.Sprint("unexpected error when closing txn", txnID))
		}
	}()

	resps := make([]*pb.ResponseUnion, len(reqs))
	for i := range reqs {
		resps[i] = applyUnion(txnID, kv, reqs[i])
	}

	if len(resps) != 0 {
		revision += 1
	}

	txnResp := &pb.TxnResponse{}
	txnResp.Header = &pb.ResponseHeader{}
	txnResp.Header.Revision = revision
	txnResp.Responses = resps
	txnResp.Succeeded = ok
	return txnResp, nil
}

func applyRange(kv dstorage.KV, r *pb.RangeRequest) (*pb.RangeResponse, error) {
	resp := &pb.RangeResponse{}
	resp.Header = &pb.ResponseHeader{}
	kvs, rev, err := kv.Range(r.Key, r.RangeEnd, r.Limit, 0)
	if err != nil {
		return nil, err
	}

	resp.Header.Revision = rev
	for i := range kvs {
		resp.Kvs = append(resp.Kvs, &kvs[i])
	}
	return resp, nil
}

func checkRequestRange(kv dstorage.KV, reqs []*pb.RequestUnion) error {
	for _, requ := range reqs {
		greq := requ.RequestRange
		if greq == nil || greq.Revision == 0 {
			continue
		}

		if greq.Revision > kv.Rev() {
			return dstorage.ErrFutureRev
		}
		if greq.Revision < kv.FirstRev() {
			return dstorage.ErrCompacted
		}
	}
	return nil
}

func applyTxn(kv dstorage.KV, le lease.Lessor, rt *pb.TxnRequest) (*pb.TxnResponse, error) {
	var revision int64

	txnID := kv.TxnBegin()
	defer func() {
		err := kv.TxnEnd(txnID)
		if err != nil {
			panic(fmt.Sprint("unexpected error when closing txn", txnID))
		}
	}()

	ok := true
	for _, c := range rt.Compare {
		if revision, ok = applyCompare(txnID, kv, c); !ok {
			break
		}
	}

	// TODO: check potential errors before actually applying anything

	var reqs []*pb.RequestUnion
	if ok {
		reqs = rt.Success
	} else {
		reqs = rt.Failure
	}

	if err := checkRequestLeases(le, reqs); err != nil {
		return nil, err
	}

	resps := make([]*pb.ResponseUnion, len(reqs))
	for i := range reqs {
		resps[i] = applyUnion(txnID, kv, reqs[i])
	}

	if len(resps) != 0 {
		revision += 1
	}

	txnResp := &pb.TxnResponse{}
	txnResp.Header = &pb.ResponseHeader{}
	txnResp.Header.Revision = revision
	txnResp.Responses = resps
	txnResp.Succeeded = ok
	return txnResp, nil
}