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topo_utils.go
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topo_utils.go
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// Copyright 2013, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package vtgate
import (
"fmt"
"strings"
"github.com/youtube/vitess/go/vt/key"
tproto "github.com/youtube/vitess/go/vt/tabletserver/proto"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/vt/vtgate/proto"
"golang.org/x/net/context"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
func mapKeyspaceIdsToShards(ctx context.Context, topoServ SrvTopoServer, cell, keyspace string, tabletType pb.TabletType, keyspaceIds []key.KeyspaceId) (string, []string, error) {
keyspace, _, allShards, err := getKeyspaceShards(ctx, topoServ, cell, keyspace, tabletType)
if err != nil {
return "", nil, err
}
var shards = make(map[string]bool)
for _, ksID := range keyspaceIds {
shard, err := getShardForKeyspaceID(allShards, ksID)
if err != nil {
return "", nil, err
}
shards[shard] = true
}
var res = make([]string, 0, len(shards))
for s := range shards {
res = append(res, s)
}
return keyspace, res, nil
}
func getKeyspaceShards(ctx context.Context, topoServ SrvTopoServer, cell, keyspace string, tabletType pb.TabletType) (string, *topo.SrvKeyspace, []topo.ShardReference, error) {
srvKeyspace, err := topoServ.GetSrvKeyspace(ctx, cell, keyspace)
if err != nil {
return "", nil, nil, fmt.Errorf("keyspace %v fetch error: %v", keyspace, err)
}
// check if the keyspace has been redirected for this tabletType.
tt := topo.ProtoToTabletType(tabletType)
if servedFrom, ok := srvKeyspace.ServedFrom[tt]; ok {
keyspace = servedFrom
srvKeyspace, err = topoServ.GetSrvKeyspace(ctx, cell, keyspace)
if err != nil {
return "", nil, nil, fmt.Errorf("keyspace %v fetch error: %v", keyspace, err)
}
}
partition, ok := srvKeyspace.Partitions[tt]
if !ok {
return "", nil, nil, fmt.Errorf("No partition found for tabletType %v in keyspace %v", strings.ToLower(tabletType.String()), keyspace)
}
return keyspace, srvKeyspace, partition.ShardReferences, nil
}
func getShardForKeyspaceID(allShards []topo.ShardReference, keyspaceID key.KeyspaceId) (string, error) {
if len(allShards) == 0 {
return "", fmt.Errorf("No shards found for this tabletType")
}
for _, shardReference := range allShards {
if shardReference.KeyRange.Contains(keyspaceID) {
return shardReference.Name, nil
}
}
return "", fmt.Errorf("KeyspaceId %v didn't match any shards %+v", keyspaceID, allShards)
}
func mapEntityIdsToShards(ctx context.Context, topoServ SrvTopoServer, cell, keyspace string, entityIds []proto.EntityId, tabletType pb.TabletType) (string, map[string][]interface{}, error) {
keyspace, _, allShards, err := getKeyspaceShards(ctx, topoServ, cell, keyspace, tabletType)
if err != nil {
return "", nil, err
}
var shards = make(map[string][]interface{})
for _, eid := range entityIds {
shard, err := getShardForKeyspaceID(allShards, eid.KeyspaceID)
if err != nil {
return "", nil, err
}
shards[shard] = append(shards[shard], eid.ExternalID)
}
return keyspace, shards, nil
}
// This function implements the restriction of handling one keyrange
// and one shard since streaming doesn't support merge sorting the results.
// The input/output api is generic though.
func mapKeyRangesToShards(ctx context.Context, topoServ SrvTopoServer, cell, keyspace string, tabletType pb.TabletType, krs []key.KeyRange) (string, []string, error) {
keyspace, _, allShards, err := getKeyspaceShards(ctx, topoServ, cell, keyspace, tabletType)
if err != nil {
return "", nil, err
}
uniqueShards := make(map[string]bool)
for _, kr := range krs {
shards, err := resolveKeyRangeToShards(allShards, kr)
if err != nil {
return "", nil, err
}
for _, shard := range shards {
uniqueShards[shard] = true
}
}
var res = make([]string, 0, len(uniqueShards))
for s := range uniqueShards {
res = append(res, s)
}
return keyspace, res, nil
}
// This maps a list of keyranges to shard names.
func resolveKeyRangeToShards(allShards []topo.ShardReference, kr key.KeyRange) ([]string, error) {
shards := make([]string, 0, 1)
if !kr.IsPartial() {
for j := 0; j < len(allShards); j++ {
shards = append(shards, allShards[j].Name)
}
return shards, nil
}
for j := 0; j < len(allShards); j++ {
shard := allShards[j]
if key.KeyRangesIntersect(kr, shard.KeyRange) {
shards = append(shards, shard.Name)
}
}
return shards, nil
}
// mapExactShards maps a keyrange to shards only if there's a complete
// match. If there's any partial match the function returns no match.
func mapExactShards(ctx context.Context, topoServ SrvTopoServer, cell, keyspace string, tabletType pb.TabletType, kr key.KeyRange) (newkeyspace string, shards []string, err error) {
keyspace, _, allShards, err := getKeyspaceShards(ctx, topoServ, cell, keyspace, tabletType)
if err != nil {
return "", nil, err
}
shardnum := 0
for shardnum < len(allShards) {
if kr.Start == allShards[shardnum].KeyRange.Start {
break
}
shardnum++
}
for shardnum < len(allShards) {
shards = append(shards, allShards[shardnum].Name)
if kr.End == allShards[shardnum].KeyRange.End {
return keyspace, shards, nil
}
shardnum++
}
return keyspace, nil, fmt.Errorf("keyrange %v does not exactly match shards", kr)
}
func boundShardQueriesToScatterBatchRequest(boundQueries []proto.BoundShardQuery) *scatterBatchRequest {
requests := &scatterBatchRequest{
Length: len(boundQueries),
Requests: make(map[string]*shardBatchRequest),
}
for i, boundQuery := range boundQueries {
for shard := range unique(boundQuery.Shards) {
key := boundQuery.Keyspace + ":" + shard
request := requests.Requests[key]
if request == nil {
request = &shardBatchRequest{
Keyspace: boundQuery.Keyspace,
Shard: shard,
}
requests.Requests[key] = request
}
request.Queries = append(request.Queries, tproto.BoundQuery{
Sql: boundQuery.Sql,
BindVariables: boundQuery.BindVariables,
})
request.ResultIndexes = append(request.ResultIndexes, i)
}
}
return requests
}
func boundKeyspaceIDQueriesToBoundShardQueries(ctx context.Context, topoServ SrvTopoServer, cell string, tabletType pb.TabletType, idQueries []proto.BoundKeyspaceIdQuery) ([]proto.BoundShardQuery, error) {
shardQueries := make([]proto.BoundShardQuery, len(idQueries))
for i, idQuery := range idQueries {
keyspace, shards, err := mapKeyspaceIdsToShards(ctx, topoServ, cell, idQuery.Keyspace, tabletType, idQuery.KeyspaceIds)
if err != nil {
return nil, err
}
shardQueries[i] = proto.BoundShardQuery{
Sql: idQuery.Sql,
BindVariables: idQuery.BindVariables,
Keyspace: keyspace,
Shards: shards,
}
}
return shardQueries, nil
}