117 lines
3.5 KiB
Go
117 lines
3.5 KiB
Go
package mesh
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"sync/atomic"
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"time"
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"github.com/example/remote-access-platform/agents/rap-node-agent/internal/fabricproto"
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)
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var fabricControlForwardSequence atomic.Uint64
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type FabricControlForwardResult struct {
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Payload json.RawMessage `json:"payload,omitempty"`
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LatencyMs int64 `json:"latency_ms"`
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Endpoint string `json:"endpoint,omitempty"`
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}
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func FabricTransportTargetFromRegistryEndpoint(endpoint FabricRegistryEndpoint) FabricTransportTarget {
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return FabricTransportTarget{
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EndpointID: strings.TrimSpace(endpoint.EndpointID),
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PeerID: strings.TrimSpace(endpoint.EndpointID),
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Endpoint: fabricControlEndpointAddress(endpoint),
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Transport: strings.TrimSpace(endpoint.Transport),
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PeerCertSHA256: strings.TrimSpace(endpoint.PeerCertSHA256),
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Timeout: 5 * time.Second,
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InboundBuffer: 4,
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ErrorBuffer: 4,
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}
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}
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func fabricControlEndpointAddress(endpoint FabricRegistryEndpoint) string {
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if mapped := fabricControlMetadataString(endpoint.Metadata, "maps_to"); mapped != "" {
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if strings.Contains(mapped, "://") {
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return mapped
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}
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return "quic://" + mapped
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}
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return strings.TrimSpace(endpoint.Address)
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}
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func fabricControlMetadataString(raw json.RawMessage, key string) string {
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if len(raw) == 0 {
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return ""
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}
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var metadata map[string]any
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if err := json.Unmarshal(raw, &metadata); err != nil {
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return ""
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}
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value, _ := metadata[key].(string)
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return strings.TrimSpace(value)
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}
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func SendFabricControlForward(ctx context.Context, transport FabricTransport, endpoint FabricRegistryEndpoint, payload []byte, timeout time.Duration) (FabricControlForwardResult, error) {
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if transport == nil {
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return FabricControlForwardResult{}, fmt.Errorf("fabric control transport is unavailable")
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}
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if len(payload) == 0 {
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return FabricControlForwardResult{}, fmt.Errorf("fabric control payload is empty")
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}
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if timeout <= 0 {
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timeout = 5 * time.Second
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}
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target := FabricTransportTargetFromRegistryEndpoint(endpoint)
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target.Timeout = timeout
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session, err := transport.Connect(ctx, target)
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if err != nil {
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return FabricControlForwardResult{}, err
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}
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defer session.Close()
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sequence := fabricControlForwardSequence.Add(1)
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if err := session.Send(ctx, fabricproto.Frame{
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Type: fabricproto.FrameData,
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TrafficClass: fabricproto.TrafficClassReliable,
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StreamID: FabricControlForwardQUICStreamID,
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Sequence: sequence,
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Payload: append([]byte(nil), payload...),
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}); err != nil {
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return FabricControlForwardResult{}, err
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}
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waitCtx := ctx
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var cancel context.CancelFunc
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if timeout > 0 {
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waitCtx, cancel = context.WithTimeout(ctx, timeout)
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defer cancel()
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}
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startedAt := time.Now()
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for {
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select {
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case <-waitCtx.Done():
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return FabricControlForwardResult{}, waitCtx.Err()
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case err, ok := <-session.Errors():
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if !ok {
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return FabricControlForwardResult{}, fmt.Errorf("fabric control session closed")
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}
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if err != nil {
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return FabricControlForwardResult{}, err
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}
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case frame, ok := <-session.Frames():
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if !ok {
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return FabricControlForwardResult{}, fmt.Errorf("fabric control session closed")
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}
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if frame.Type != fabricproto.FrameData || frame.StreamID != FabricControlForwardQUICStreamID || frame.Sequence != sequence {
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continue
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}
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return FabricControlForwardResult{
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Payload: append(json.RawMessage(nil), frame.Payload...),
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LatencyMs: time.Since(startedAt).Milliseconds(),
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Endpoint: endpoint.Address,
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}, nil
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}
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}
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}
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