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Implements compute node heartbeats to requester node(s)
Adds pkg/node/heartbeat which contains a client and a server for sending heartbeat messages over NATS PubSub.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package heartbeat | ||
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| import ( | ||
| "context" | ||
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| natsPubSub "github.com/bacalhau-project/bacalhau/pkg/nats/pubsub" | ||
| "github.com/bacalhau-project/bacalhau/pkg/pubsub" | ||
| "github.com/rs/zerolog/log" | ||
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| "github.com/nats-io/nats.go" | ||
| ) | ||
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| type HeartbeatClient struct { | ||
| publisher *natsPubSub.PubSub[Heartbeat] | ||
| nodeID string | ||
| } | ||
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| func NewClient(conn *nats.Conn, nodeID string) (*HeartbeatClient, error) { | ||
| subParams := natsPubSub.PubSubParams{ | ||
| Subject: heartbeatTopic, | ||
| Conn: conn, | ||
| } | ||
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| publisher, err := natsPubSub.NewPubSub[Heartbeat](subParams) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return &HeartbeatClient{publisher: publisher, nodeID: nodeID}, nil | ||
| } | ||
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| func (h *HeartbeatClient) Start(ctx context.Context) error { | ||
| // Waits until we are cancelled and then closes the publisher | ||
| <-ctx.Done() | ||
| return h.publisher.Close(ctx) | ||
| } | ||
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| func (h *HeartbeatClient) SendHeartbeat(ctx context.Context, sequence uint64) error { | ||
| log.Ctx(ctx).Trace().Msgf("sending heartbeat seq: %d", sequence) | ||
| return h.Publish(ctx, Heartbeat{NodeID: h.nodeID, Sequence: sequence}) | ||
| } | ||
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| func (h *HeartbeatClient) Publish(ctx context.Context, message Heartbeat) error { | ||
| return h.publisher.Publish(ctx, message) | ||
| } | ||
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| var _ pubsub.Publisher[Heartbeat] = (*HeartbeatClient)(nil) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package heartbeat | ||
|
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| import ( | ||
| "context" | ||
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| natsPubSub "github.com/bacalhau-project/bacalhau/pkg/nats/pubsub" | ||
| "github.com/bacalhau-project/bacalhau/pkg/pubsub" | ||
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| "github.com/nats-io/nats.go" | ||
| "github.com/rs/zerolog/log" | ||
| ) | ||
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| type HeartbeatServer struct { | ||
| subscription *natsPubSub.PubSub[Heartbeat] | ||
| } | ||
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| func NewServer(conn *nats.Conn) (*HeartbeatServer, error) { | ||
| subParams := natsPubSub.PubSubParams{ | ||
| Subject: heartbeatTopic, | ||
| Conn: conn, | ||
| } | ||
|
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| subscription, err := natsPubSub.NewPubSub[Heartbeat](subParams) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &HeartbeatServer{subscription: subscription}, nil | ||
| } | ||
|
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| func (h *HeartbeatServer) Start(ctx context.Context) error { | ||
| if err := h.subscription.Subscribe(ctx, h); err != nil { | ||
| return err | ||
| } | ||
|
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| go func(ctx context.Context) { | ||
| log.Ctx(ctx).Info().Msg("Heartbeat server started") | ||
| <-ctx.Done() | ||
| _ = h.subscription.Close(ctx) | ||
| log.Ctx(ctx).Info().Msg("Heartbeat server shutdown") | ||
| }(ctx) | ||
|
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| return nil | ||
| } | ||
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| func (h *HeartbeatServer) Handle(ctx context.Context, message Heartbeat) error { | ||
| log.Ctx(ctx).Trace().Msgf("heartbeat received from %s", message.NodeID) | ||
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| // TODO: Process the heartbeat (e.g. update the node's last seen time) | ||
|
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| return nil | ||
| } | ||
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| var _ pubsub.Subscriber[Heartbeat] = (*HeartbeatServer)(nil) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package heartbeat | ||
|
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| const heartbeatTopic = "heartbeat" | ||
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| // Heartbeat represents a heartbeat message from a specific node. | ||
| // It contains the node ID and the sequence number of the heartbeat | ||
| // which is monotonically increasing (reboots aside). We do not | ||
| // use timestamps on the client, we rely solely on the server-side | ||
| // time to avoid clock drift issues. | ||
| type Heartbeat struct { | ||
| NodeID string | ||
| Sequence uint64 | ||
| } |
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