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partition.go
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/
partition.go
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// Copyright 2019-present Open Networking Foundation.
//
// 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 storage
import (
"context"
"github.com/atomix/atomix-go-framework/pkg/atomix/storage/protocol/rsm"
streams "github.com/atomix/atomix-go-framework/pkg/atomix/stream"
"github.com/gogo/protobuf/proto"
"github.com/lni/dragonboat/v3"
"sort"
"sync"
"time"
)
const clientTimeout = 30 * time.Second
// newPartition returns a new Raft consensus partition client
func newPartition(protocol *Protocol, clusterID uint64, nodeID uint64, node *dragonboat.NodeHost, streams *streamManager) *Partition {
return &Partition{
protocol: protocol,
clusterID: clusterID,
nodeID: nodeID,
node: node,
streams: streams,
listeners: make(map[int]chan<- rsm.PartitionConfig),
}
}
// Partition is a Raft partition
type Partition struct {
protocol *Protocol
clusterID uint64
nodeID uint64
node *dragonboat.NodeHost
streams *streamManager
config rsm.PartitionConfig
listeners map[int]chan<- rsm.PartitionConfig
listenerID int
mu sync.RWMutex
}
// MustLeader returns whether the Raft partition requires a leader
func (c *Partition) MustLeader() bool {
return true
}
// IsLeader returns whether the local node is the leader for this partition
func (c *Partition) IsLeader() bool {
leader, ok, err := c.node.GetLeaderID(c.clusterID)
if !ok || err != nil {
return false
}
return leader == c.nodeID
}
// Leader returns the leader address for this partition
func (c *Partition) Leader() string {
c.mu.RLock()
defer c.mu.RUnlock()
return c.config.Leader
}
// Followers returns the current set of followers' addresses for this partition
func (c *Partition) Followers() []string {
c.mu.RLock()
defer c.mu.RUnlock()
return c.config.Followers
}
func (c *Partition) updateConfig(leader string) {
log.Infof("Updating leader for partition %d: %s", c.clusterID, leader)
c.mu.Lock()
defer c.mu.Unlock()
config := rsm.PartitionConfig{}
leaderID := c.protocol.getNodeID(leader)
apiAddresses := c.protocol.getAPIAddresses()
config.Leader = apiAddresses[leaderID]
config.Followers = make([]string, 0, len(apiAddresses))
for id, memberAddress := range apiAddresses {
if id != leaderID {
config.Followers = append(config.Followers, memberAddress)
}
}
sort.Slice(config.Followers, func(i, j int) bool {
return config.Followers[i] < config.Followers[j]
})
c.config = config
for _, listener := range c.listeners {
listener <- config
}
}
// WatchConfig watches the partition configuration for changes
func (c *Partition) WatchConfig(ctx context.Context, ch chan<- rsm.PartitionConfig) error {
c.listenerID++
id := c.listenerID
c.mu.Lock()
c.listeners[id] = ch
c.mu.Unlock()
go func() {
c.mu.RLock()
ch <- c.config
c.mu.RUnlock()
<-ctx.Done()
c.mu.Lock()
close(ch)
delete(c.listeners, id)
c.mu.Unlock()
}()
return nil
}
// SyncCommand executes a state machine command on the partition
func (c *Partition) SyncCommand(ctx context.Context, input []byte, stream streams.WriteStream) error {
streamID := c.streams.addStream(stream)
defer c.streams.removeStream(streamID)
entry := &Entry{
Value: input,
StreamID: streamID,
}
bytes, err := proto.Marshal(entry)
if err != nil {
return err
}
ctx, cancel := context.WithTimeout(ctx, clientTimeout)
defer cancel()
if _, err := c.node.SyncPropose(ctx, c.node.GetNoOPSession(c.clusterID), bytes); err != nil {
return err
}
return nil
}
// SyncQuery executes a state machine query on the partition
func (c *Partition) SyncQuery(ctx context.Context, input []byte, stream streams.WriteStream) error {
query := queryContext{
value: input,
stream: stream,
}
ctx, cancel := context.WithTimeout(ctx, clientTimeout)
defer cancel()
if _, err := c.node.SyncRead(ctx, c.clusterID, query); err != nil {
return err
}
return nil
}
// StaleQuery executes a state machine query on the partition
func (c *Partition) StaleQuery(ctx context.Context, input []byte, stream streams.WriteStream) error {
query := queryContext{
value: input,
stream: stream,
}
if _, err := c.node.StaleRead(c.clusterID, query); err != nil {
return err
}
return nil
}
var _ rsm.Partition = &Partition{}