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responder.go
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responder.go
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package server
import (
"github.com/wandb/wandb/nexus/pkg/observability"
"github.com/wandb/wandb/nexus/pkg/service"
)
type Responder interface {
Respond(response *service.ServerResponse)
}
type ResponderEntry struct {
Responder Responder
ID string
}
type Dispatcher struct {
responders map[string]Responder
logger *observability.NexusLogger
}
// do is the main loop of the dispatcher to process incoming messages
func (d *Dispatcher) do(hChan, sChan <-chan *service.Result) {
defer d.logger.Reraise()
for hChan != nil || sChan != nil {
select {
case result, ok := <-hChan:
if !ok {
hChan = nil
continue
}
d.handleRespond(result)
case result, ok := <-sChan:
if !ok {
sChan = nil
continue
}
d.handleRespond(result)
}
}
d.logger.Debug("dispatch: finished")
}
// AddResponders adds the given responders to the stream's dispatcher.
func (d *Dispatcher) AddResponders(entries ...ResponderEntry) {
if d.responders == nil {
d.responders = make(map[string]Responder)
}
for _, entry := range entries {
responderId := entry.ID
if _, ok := d.responders[responderId]; !ok {
d.responders[responderId] = entry.Responder
} else {
d.logger.CaptureWarn("Responder already exists", "responder", responderId)
}
}
}
func (d *Dispatcher) handleRespond(result *service.Result) {
responderId := result.GetControl().GetConnectionId()
d.logger.Debug("dispatch: got result", "result", result)
if responderId == "" {
d.logger.Debug("dispatch: got result with no connection id", "result", result)
return
}
response := &service.ServerResponse{
ServerResponseType: &service.ServerResponse_ResultCommunicate{
ResultCommunicate: result,
},
}
d.responders[responderId].Respond(response)
}
func NewDispatcher(logger *observability.NexusLogger) *Dispatcher {
return &Dispatcher{
logger: logger,
responders: make(map[string]Responder),
}
}