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connection.go
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connection.go
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package agent
import (
"fmt"
"time"
"github.com/jannfis/argocd-agent/internal/event"
"github.com/jannfis/argocd-agent/internal/grpcutil"
"github.com/jannfis/argocd-agent/pkg/api/grpc/eventstreamapi"
"github.com/sirupsen/logrus"
format "github.com/cloudevents/sdk-go/binding/format/protobuf/v2"
cloudevents "github.com/cloudevents/sdk-go/v2"
)
func (a *Agent) maintainConnection() error {
go func() {
var err error
for {
if !a.IsConnected() {
err = a.remote.Connect(a.context, false)
if err != nil {
log().Warnf("Could not connect to %s: %v", a.remote.Addr(), err)
} else {
err = a.queues.Create(a.remote.ClientID())
if err != nil {
log().Warnf("Could not create agent queue pair: %v", err)
} else {
a.SetConnected(true)
}
}
} else {
err = a.handleStreamEvents()
if err != nil {
log().Warnf("Error while handling stream events: %v", err)
}
}
time.Sleep(100 * time.Millisecond)
}
}()
return nil
}
func (a *Agent) sender(stream eventstreamapi.EventStream_SubscribeClient) error {
logCtx := log().WithFields(logrus.Fields{
"module": "StreamEvent",
"direction": "Send",
"client_addr": grpcutil.AddressFromContext(stream.Context()),
})
q := a.queues.SendQ(a.remote.ClientID())
if q == nil {
return fmt.Errorf("no send queue found for the remote principal")
}
// Get() is blocking until there is at least one item in the
// queue.
logCtx.Tracef("Waiting to grab an item from queue as it appears")
item, shutdown := q.Get()
if shutdown {
logCtx.Tracef("Queue shutdown in progress")
return nil
}
logCtx.Tracef("Grabbed an item")
if item == nil {
// FIXME: Is this really the right thing to do?
return nil
}
ev, ok := item.(*cloudevents.Event)
if !ok {
logCtx.Warnf("invalid data in sendqueue")
return nil
}
logCtx.Tracef("Sending an item to the event stream")
pev, err := format.ToProto(ev)
if err != nil {
logCtx.Warnf("Could not wire event: %v", err)
return nil
}
err = stream.Send(&eventstreamapi.Event{Event: pev})
if err != nil {
if grpcutil.NeedReconnectOnError(err) {
return err
} else {
logCtx.Infof("Error while sending: %v", err)
return nil
}
}
return nil
}
// receiver receives and processes a single event from the event stream. It
// will block until an event has been received, or an error has occured.
func (a *Agent) receiver(stream eventstreamapi.EventStream_SubscribeClient) error {
logCtx := log().WithFields(logrus.Fields{
"module": "StreamEvent",
"direction": "Recv",
"client_addr": grpcutil.AddressFromContext(stream.Context()),
})
rcvd, err := stream.Recv()
if err != nil {
if grpcutil.NeedReconnectOnError(err) {
return err
} else {
logCtx.Infof("Error while receiving: %v", err)
return nil
}
}
ev, err := event.FromWire(rcvd.Event)
if err != nil {
logCtx.Errorf("Could not unwrap event: %v", err)
return nil
}
logCtx.Debugf("Received a new event from stream")
err = a.processIncomingEvent(ev)
if err != nil {
logCtx.WithError(err).Errorf("Unable to process incoming event")
}
// switch ev.Type() {
// case event.Create:
// _, err := a.createApplication(incomingApp)
// if err != nil {
// logCtx.Errorf("Error creating application: %v", err)
// }
// case event.SpecUpdate:
// _, err = a.updateApplication(incomingApp)
// if err != nil {
// logCtx.Errorf("Error updating application: %v", err)
// }
// case event.Delete:
// err = a.deleteApplication(incomingApp)
// if err != nil {
// logCtx.Errorf("Error deleting application: %v", err)
// }
// default:
// logCtx.Warnf("Received an unknown event: %s. Protocol mismatch?", ev.Type())
// }
return nil
}
func (a *Agent) handleStreamEvents() error {
conn := a.remote.Conn()
client := eventstreamapi.NewEventStreamClient(conn)
stream, err := client.Subscribe(a.context)
if err != nil {
return err
}
logCtx := log().WithFields(logrus.Fields{
"module": "StreamEvent",
"server_addr": grpcutil.AddressFromContext(stream.Context()),
})
// Receive events from the subscription stream
go func() {
logCtx := logCtx.WithFields(logrus.Fields{
"direction": "recv",
})
logCtx.Info("Starting to receive events from event stream")
var err error
for a.IsConnected() && err == nil {
err = a.receiver(stream)
if err != nil {
if grpcutil.NeedReconnectOnError(err) {
a.SetConnected(false)
} else {
logCtx.Errorf("Error while sending to stream: %v", err)
}
}
}
}()
// Send events in the sendq to the event stream
go func() {
logCtx := logCtx.WithFields(logrus.Fields{
"direction": "send",
})
logCtx.Info("Starting to send events to event stream")
var err error
for a.IsConnected() && err == nil {
err = a.sender(stream)
if err != nil {
if grpcutil.NeedReconnectOnError(err) {
a.SetConnected(false)
} else {
logCtx.Errorf("Error while sending to stream: %v", err)
}
}
}
}()
for a.IsConnected() {
select {
case <-a.context.Done():
return nil
default:
time.Sleep(100 * time.Millisecond)
}
}
log().WithField("component", "EventHandler").Info("Stream closed")
err = a.queues.Delete(a.remote.ClientID(), true)
if err != nil {
log().Errorf("Could not remove agent queue: %v", err)
}
return nil
}