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rpc_server.go
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rpc_server.go
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package copper
import (
"encoding/binary"
"fmt"
"io"
"github.com/snaury/copper/protocol"
)
func rpcWrapServer(stream Stream, server lowLevelServer) error {
rtype, readerr := rpcReadRequestType(stream)
if readerr != nil {
return EINVALID
}
switch rtype {
case protocol.RequestType_NewStream:
var buf [8]byte
_, err := stream.Read(buf[0:8])
if err != nil {
return EINVALID
}
targetID := binary.BigEndian.Uint64(buf[0:8])
return server.handleNewStream(int64(targetID), stream)
case protocol.RequestType_Subscribe:
var request protocol.SubscribeRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
targetID, err := server.subscribe(SubscribeSettings{
Options: rpcProtoToSubscribeOptions(request.GetOptions()),
DisableRoutes: request.GetDisableRoutes(),
})
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.SubscribeResponse{
TargetId: targetID,
})
case protocol.RequestType_GetEndpoints:
var request protocol.GetEndpointsRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
endpoints, err := server.getEndpoints(request.GetTargetId())
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.GetEndpointsResponse{
Endpoints: rpcEndpointsToProto(endpoints),
})
case protocol.RequestType_StreamEndpoints:
var request protocol.StreamEndpointsRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
changes, err := server.streamEndpoints(request.GetTargetId())
if err != nil {
return err
}
defer changes.Stop()
go func() {
// this goroutine detects when write side is closed, which closes
// the changes stream and unblocks a read below
defer changes.Stop()
<-stream.WriteClosed()
}()
for {
result, err := changes.Read()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
err = rpcWriteMessage(stream, &protocol.StreamEndpointsResponse{
Added: rpcEndpointsToProto(result.Added),
Removed: rpcEndpointsToProto(result.Removed),
})
if err != nil {
return err
}
}
case protocol.RequestType_Unsubscribe:
var request protocol.UnsubscribeRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
err = server.unsubscribe(request.GetTargetId())
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.UnsubscribeResponse{})
case protocol.RequestType_Publish:
var request protocol.PublishRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
err = server.publish(
request.GetTargetId(),
request.GetName(),
rpcProtoToPublishSettings(request.GetSettings()),
)
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.PublishResponse{})
case protocol.RequestType_Unpublish:
var request protocol.UnpublishRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
err = server.unpublish(request.GetTargetId())
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.UnpublishResponse{})
case protocol.RequestType_SetRoute:
var request protocol.SetRouteRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
err = server.setRoute(request.GetName(), rpcProtoToRoutes(request.GetRoutes())...)
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.SetRouteResponse{})
case protocol.RequestType_ListRoutes:
var request protocol.ListRoutesRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
names, err := server.listRoutes()
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.ListRoutesResponse{
Names: names,
})
case protocol.RequestType_LookupRoute:
var request protocol.LookupRouteRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
routes, err := server.lookupRoute(request.GetName())
if err != nil {
return err
}
return rpcWriteMessage(stream, &protocol.LookupRouteResponse{
Routes: rpcRoutesToProto(routes),
})
case protocol.RequestType_StreamServices:
var request protocol.StreamServicesRequest
err := rpcReadMessage(stream, &request)
if err != nil {
return EINVALID
}
changes, err := server.streamServices()
if err != nil {
return err
}
defer changes.Stop()
go func() {
// this goroutine detects when read side is closed, which closes
// the changes stream and unblocks a read below
defer changes.Stop()
<-stream.WriteClosed()
}()
for {
result, err := changes.Read()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
err = rpcWriteMessage(stream, &protocol.StreamServicesResponse{
Removed: result.Removed,
Changed: rpcServiceChangesToProto(result.Changed),
})
if err != nil {
return err
}
}
}
return copperError{
error: fmt.Errorf("unsupported request type %d", rtype),
code: EUNSUPPORTED,
}
}