edge/pkg/module/net/module.go

159 lines
3.1 KiB
Go

package net
import (
"context"
"forge.cadoles.com/arcad/edge/pkg/app"
"forge.cadoles.com/arcad/edge/pkg/bus"
edgeHTTP "forge.cadoles.com/arcad/edge/pkg/http"
"forge.cadoles.com/arcad/edge/pkg/module"
"forge.cadoles.com/arcad/edge/pkg/module/util"
"github.com/dop251/goja"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
type Module struct {
server *app.Server
bus bus.Bus
}
func (m *Module) Name() string {
return "net"
}
func (m *Module) Export(export *goja.Object) {
if err := export.Set("broadcast", m.broadcast); err != nil {
panic(errors.Wrap(err, "could not set 'broadcast' function"))
}
if err := export.Set("send", m.send); err != nil {
panic(errors.Wrap(err, "could not set 'send' function"))
}
}
func (m *Module) broadcast(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
if len(call.Arguments) < 1 {
panic(rt.ToValue(errors.New("invalid number of argument")))
}
data := call.Argument(0).Export()
msg := module.NewServerMessage(nil, data)
if err := m.bus.Publish(context.Background(), msg); err != nil {
panic(rt.ToValue(errors.WithStack(err)))
}
return nil
}
func (m *Module) send(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
if len(call.Arguments) < 2 {
panic(rt.ToValue(errors.New("invalid number of argument")))
}
var ctx context.Context
firstArg := call.Argument(0)
sessionID, ok := firstArg.Export().(string)
if ok {
ctx = module.WithContext(context.Background(), map[module.ContextKey]any{
edgeHTTP.ContextKeySessionID: sessionID,
})
} else {
ctx = util.AssertContext(firstArg, rt)
}
data := call.Argument(1).Export()
msg := module.NewServerMessage(ctx, data)
if err := m.bus.Publish(ctx, msg); err != nil {
panic(rt.ToValue(errors.WithStack(err)))
}
return nil
}
func (m *Module) handleClientMessages() {
ctx := context.Background()
logger.Debug(
ctx,
"subscribing to bus messages",
)
clientMessages, err := m.bus.Subscribe(ctx, module.MessageNamespaceClient)
if err != nil {
panic(errors.WithStack(err))
}
defer func() {
logger.Debug(
ctx,
"unsubscribing from bus messages",
)
m.bus.Unsubscribe(ctx, module.MessageNamespaceClient, clientMessages)
}()
for {
logger.Debug(
ctx,
"waiting for next message",
)
select {
case <-ctx.Done():
logger.Debug(
ctx,
"context done",
)
return
case msg := <-clientMessages:
clientMessage, ok := msg.(*module.ClientMessage)
if !ok {
logger.Error(
ctx,
"unexpected message type",
logger.F("message", msg),
)
continue
}
logger.Debug(
ctx,
"received client message",
logger.F("message", clientMessage),
)
if _, err := m.server.ExecFuncByName("onClientMessage", clientMessage.Context, clientMessage.Data); err != nil {
if errors.Is(err, app.ErrFuncDoesNotExist) {
continue
}
logger.Error(
ctx,
"on client message error",
logger.E(err),
)
}
}
}
}
func ModuleFactory(bus bus.Bus) app.ServerModuleFactory {
return func(server *app.Server) app.ServerModule {
module := &Module{
server: server,
bus: bus,
}
go module.handleClientMessages()
return module
}
}