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cluster.go
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cluster.go
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// Copyright 2018-2022 Burak Sezer
//
// 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
//
// https://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 olric
import (
"context"
"fmt"
"strconv"
"github.com/buraksezer/olric/internal/protocol"
"github.com/tidwall/redcon"
)
type Route struct {
PrimaryOwners []string
ReplicaOwners []string
}
type RoutingTable map[uint64]Route
func mapToRoutingTable(slice []interface{}) (RoutingTable, error) {
rt := make(RoutingTable)
for _, raw := range slice {
item := raw.([]interface{})
rawPartID, rawPrimaryOwners, rawReplicaOwners := item[0], item[1], item[2]
var partID uint64
switch rawPartID.(type) {
case int64:
partID = uint64(rawPartID.(int64))
case string:
raw, err := strconv.ParseUint(rawPartID.(string), 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid partition id: %v: %w", rawPartID, err)
}
partID = raw
default:
return nil, fmt.Errorf("invalid partition id: %v", rawPartID)
}
r := Route{}
primaryOwners, ok := rawPrimaryOwners.([]interface{})
if !ok {
return nil, fmt.Errorf("invalid primary owners: %v", rawPrimaryOwners)
}
for _, rawOwner := range primaryOwners {
owner, ok := rawOwner.(string)
if !ok {
return nil, fmt.Errorf("invalid owner: %v", owner)
}
r.PrimaryOwners = append(r.PrimaryOwners, owner)
}
replicaOwners, ok := rawReplicaOwners.([]interface{})
if !ok {
return nil, fmt.Errorf("invalid replica owners: %v", rawPrimaryOwners)
}
for _, rawOwner := range replicaOwners {
owner, ok := rawOwner.(string)
if !ok {
return nil, fmt.Errorf("invalid owner: %v", owner)
}
r.ReplicaOwners = append(r.ReplicaOwners, owner)
}
rt[partID] = r
}
return rt, nil
}
func (db *Olric) clusterRoutingTableCommandHandler(conn redcon.Conn, cmd redcon.Command) {
_, err := protocol.ParseClusterRoutingTable(cmd)
if err != nil {
protocol.WriteError(conn, err)
return
}
coordinator := db.rt.Discovery().GetCoordinator()
if coordinator.CompareByID(db.rt.This()) {
conn.WriteArray(int(db.config.PartitionCount))
rt := db.fillRoutingTable()
for partID := uint64(0); partID < db.config.PartitionCount; partID++ {
conn.WriteArray(3)
conn.WriteUint64(partID)
r := rt[partID]
primaryOwners := r.PrimaryOwners
conn.WriteArray(len(primaryOwners))
for _, owner := range primaryOwners {
conn.WriteBulkString(owner)
}
replicaOwners := r.ReplicaOwners
conn.WriteArray(len(replicaOwners))
for _, owner := range replicaOwners {
conn.WriteBulkString(owner)
}
}
return
}
// Redirect to the cluster coordinator
rtCmd := protocol.NewClusterRoutingTable().Command(db.ctx)
rc := db.client.Get(coordinator.String())
err = rc.Process(db.ctx, rtCmd)
if err != nil {
protocol.WriteError(conn, err)
return
}
slice, err := rtCmd.Slice()
if err != nil {
protocol.WriteError(conn, err)
return
}
conn.WriteAny(slice)
}
func (db *Olric) fillRoutingTable() RoutingTable {
rt := make(RoutingTable)
for partID := uint64(0); partID < db.config.PartitionCount; partID++ {
r := Route{}
primaryOwners := db.primary.PartitionOwnersByID(partID)
for _, owner := range primaryOwners {
r.PrimaryOwners = append(r.PrimaryOwners, owner.String())
}
replicaOwners := db.backup.PartitionOwnersByID(partID)
for _, owner := range replicaOwners {
r.ReplicaOwners = append(r.ReplicaOwners, owner.String())
}
rt[partID] = r
}
return rt
}
func (db *Olric) routingTable(ctx context.Context) (RoutingTable, error) {
coordinator := db.rt.Discovery().GetCoordinator()
if coordinator.CompareByID(db.rt.This()) {
return db.fillRoutingTable(), nil
}
rtCmd := protocol.NewClusterRoutingTable().Command(ctx)
rc := db.client.Get(coordinator.String())
err := rc.Process(ctx, rtCmd)
if err != nil {
return nil, err
}
slice, err := rtCmd.Slice()
if err != nil {
return nil, err
}
return mapToRoutingTable(slice)
}
func (db *Olric) clusterMembersCommandHandler(conn redcon.Conn, cmd redcon.Command) {
_, err := protocol.ParseClusterMembers(cmd)
if err != nil {
protocol.WriteError(conn, err)
return
}
coordinator := db.rt.Discovery().GetCoordinator()
members := db.rt.Discovery().GetMembers()
conn.WriteArray(len(members))
for _, member := range members {
conn.WriteArray(3)
conn.WriteBulkString(member.Name)
// go-redis/redis package cannot handle uint64. At the time of this writing,
// there is no solution for this, and I don't want to use a soft fork to repair it.
//conn.WriteUint64(member.ID)
conn.WriteInt64(member.Birthdate)
if coordinator.CompareByID(member) {
conn.WriteBulkString("true")
} else {
conn.WriteBulkString("false")
}
}
}