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cluster_choose.go
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cluster_choose.go
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package ogimpl
import (
"context"
"fmt"
"log/slog"
"github.com/symphony09/ograph"
"github.com/symphony09/ograph/ogcore"
)
var ChooseClusterFactory = func() ogcore.Node {
return &ChooseCluster{}
}
type ChooseCluster struct {
ograph.BaseCluster
*slog.Logger
ChooseNode string
ChooseFn func(ctx context.Context, state ogcore.State) int
}
func (cluster *ChooseCluster) Run(ctx context.Context, state ogcore.State) error {
if cluster.Logger == nil {
cluster.Logger = slog.Default()
}
var chosenNode ogcore.Node
if cluster.ChooseNode != "" {
chosenNode = cluster.NodeMap[cluster.ChooseNode]
} else if cluster.ChooseFn != nil {
n := cluster.ChooseFn(ctx, state)
if n > 0 || n <= len(cluster.Group) {
chosenNode = cluster.Group[n-1]
}
}
if chosenNode == nil {
return nil
}
nodeName := "unknown"
if nameable, ok := chosenNode.(ogcore.Nameable); ok {
nodeName = nameable.Name()
}
if err := chosenNode.Run(ctx, state); err != nil {
return fmt.Errorf("chosen node (%s) failed, err: %w", nodeName, err)
} else {
cluster.Info("choose cluster finish", "Chosen", nodeName)
return nil
}
}
func NewChooseClusterFactory(
chooseFn func(ctx context.Context, state ogcore.State) int,
) func() ogcore.Node {
return func() ogcore.Node {
return &ChooseCluster{
ChooseFn: chooseFn,
}
}
}