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cluster_race.go
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cluster_race.go
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package ogimpl
import (
"context"
"errors"
"log/slog"
"sync"
"sync/atomic"
"github.com/symphony09/ograph"
"github.com/symphony09/ograph/ogcore"
)
var RaceClusterFactory = func() ogcore.Node {
return &RaceCluster{}
}
type RaceCluster struct {
ograph.BaseCluster
*slog.Logger
StateIsolation bool
}
func (cluster *RaceCluster) Run(ctx context.Context, state ogcore.State) error {
if cluster.Logger == nil {
cluster.Logger = slog.Default()
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
raceCh := make(chan struct{})
var failures atomic.Uint32
var once sync.Once
var winner string
for _, node := range cluster.Group {
go func(node ogcore.Node) {
var clusterState ogcore.State
if cluster.StateIsolation {
clusterState = NewOverlayState(state)
} else {
clusterState = NewGuardState(state, func(key any) (flag int) {
if ctx.Err() != nil {
return AllowRead
} else {
return AllowRead | AllowWrite
}
})
}
nodeName := "unknown"
if nameable, ok := node.(ogcore.Nameable); ok {
nodeName = nameable.Name()
}
if err := node.Run(ctx, clusterState); err != nil {
cluster.Warn("race node failed",
"RaceCluster", cluster.Name(), "RaceNode", nodeName, "Error", err)
if int(failures.Add(1)) == len(cluster.Group) {
close(raceCh)
}
} else {
once.Do(func() {
winner = nodeName
close(raceCh)
})
}
}(node)
}
<-raceCh
if int(failures.Load()) == len(cluster.Group) {
return errors.New("all race nodes failed")
}
cluster.Info("race cluster finish", "Winner", winner)
return nil
}