68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
package element
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import (
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"errors"
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"time"
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"github.com/hashicorp/memberlist"
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)
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const (
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defaultInterval = time.Second * 10
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nodeReconcileTimeout = defaultInterval * 3
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nodeUpdateTimeout = defaultInterval / 2
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)
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var (
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ErrUnknownConnectionType = errors.New("unknown connection type")
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)
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// Agent represents the node agent
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type Agent struct {
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config *Config
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members *memberlist.Memberlist
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peerUpdateChan chan bool
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nodeEventChan chan *NodeEvent
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registeredServices map[string]struct{}
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memberConfig *memberlist.Config
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}
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// NewAgent returns a new node agent
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func NewAgent(cfg *Config) (*Agent, error) {
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updateCh := make(chan bool)
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nodeEventCh := make(chan *NodeEvent)
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mc, err := cfg.memberListConfig(updateCh, nodeEventCh)
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if err != nil {
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return nil, err
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}
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ml, err := memberlist.Create(mc)
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if err != nil {
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return nil, err
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}
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return &Agent{
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config: cfg,
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members: ml,
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peerUpdateChan: updateCh,
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nodeEventChan: nodeEventCh,
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memberConfig: mc,
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}, nil
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}
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// SyncInterval returns the cluster sync interval
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func (a *Agent) SyncInterval() time.Duration {
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return a.memberConfig.PushPullInterval
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}
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// Subscribe subscribes to the node event channel
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func (a *Agent) Subscribe(ch chan *NodeEvent) {
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go func() {
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for {
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select {
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case evt := <-a.nodeEventChan:
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ch <- evt
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}
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}
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}()
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}
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