alt/services/worker/internal/socket/handlers.go

package socket

import (
	protoSocket "git.toki-labs.com/toki/proto-socket/go"

	altv1 "git.toki-labs.com/toki/alt/packages/contracts/gen/go/alt/v1"
)

type sessionHandler struct {
	requestType string
	register    func(*protoSocket.WsClient)
}

// sessionHandlers returns the handlers registered on every worker session.
// Hello is always present; market and backtest command/query handlers attach
// through the same registry instead of bespoke registration paths.
func sessionHandlers(deps Deps) []sessionHandler {
	handlers := []sessionHandler{
		helloHandler(),
	}
	handlers = append(handlers, marketHandlers(deps)...)
	handlers = append(handlers, backtestHandlers(deps)...)
	return handlers
}

// registerSessionHandlers builds the OnClientConnected callback bound to the
// given dependencies.
func registerSessionHandlers(deps Deps) func(*protoSocket.WsClient) {
	handlers := sessionHandlers(deps)
	return func(client *protoSocket.WsClient) {
		registerHandlers(client, handlers)
	}
}

func registerHandlers(client *protoSocket.WsClient, handlers []sessionHandler) {
	for _, handler := range handlers {
		if handler.register == nil {
			continue
		}
		handler.register(client)
	}
}

func helloHandler() sessionHandler {
	return sessionHandler{
		requestType: protoSocket.TypeNameOf(&altv1.HelloRequest{}),
		register: func(client *protoSocket.WsClient) {
			protoSocket.AddRequestListenerTyped[*altv1.HelloRequest, *altv1.HelloResponse](&client.Communicator, handleHello)
		},
	}
}

func handleHello(req *altv1.HelloRequest) (*altv1.HelloResponse, error) {
	protocolVersion := req.GetAltProtocolVersion()
	if protocolVersion == "" {
		protocolVersion = defaultAltProtocolVersion
	}
	return &altv1.HelloResponse{
		ServerName:         serverName,
		ServerVersion:      serverVersion,
		AltProtocolVersion: protocolVersion,
		Capabilities: []string{
			"hello",
			"market-read",
			"worker-execution",
		},
	}, nil
}