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|
package tunserver
import (
"io"
"strings"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware/v2"
"gitlab.com/gitlab-org/cluster-integration/gitlab-agent/v16/internal/module/modshared"
"gitlab.com/gitlab-org/cluster-integration/gitlab-agent/v16/internal/tool/prototool"
"gitlab.com/gitlab-org/cluster-integration/gitlab-agent/v16/internal/tunnel/rpc"
"go.uber.org/zap"
statuspb "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
func (r *Router) routeToTunclient(srv interface{}, stream grpc.ServerStream) error {
ctx := stream.Context()
rpcAPI := modshared.RPCAPIFromContext(ctx)
tunnelFound, log, findHandle, err := r.plugin.FindTunnel(stream, rpcAPI)
if err != nil {
return err
}
defer findHandle.Done(ctx)
md, _ := metadata.FromIncomingContext(ctx)
// Overwrite incoming MD with sanitized MD
wrappedStream := grpc_middleware.WrapServerStream(stream)
wrappedStream.WrappedContext = metadata.NewIncomingContext(
wrappedStream.WrappedContext,
removeHopMeta(md),
)
ctx = wrappedStream.WrappedContext
stream = wrappedStream
if !tunnelFound {
err = stream.SendMsg(&rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_NoTunnel_{
NoTunnel: &rpc.GatewayResponse_NoTunnel{},
},
})
if err != nil {
return rpcAPI.HandleIOError(log, "SendMsg(GatewayResponse_NoTunnel) failed", err)
}
}
tun, err := findHandle.Get(ctx)
if err != nil {
return err
}
defer tun.Done(ctx)
err = stream.SendMsg(&rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_TunnelReady_{
TunnelReady: &rpc.GatewayResponse_TunnelReady{},
},
})
if err != nil {
return rpcAPI.HandleIOError(log, "SendMsg(GatewayResponse_TunnelReady) failed", err)
}
var start rpc.StartStreaming
err = stream.RecvMsg(&start)
if err != nil {
if err == io.EOF { //nolint:errorlint
// Routing kas decided not to proceed
return nil
}
return err
}
return tun.ForwardStream(log, rpcAPI, stream, newWrappingCallback(log, rpcAPI, stream))
}
func removeHopMeta(md metadata.MD) metadata.MD {
md = md.Copy()
for k := range md {
if strings.HasPrefix(k, RoutingHopPrefix) {
delete(md, k)
}
}
return md
}
type wrappingCallback struct {
log *zap.Logger
rpcAPI modshared.RPCAPI
stream grpc.ServerStream
}
func newWrappingCallback(log *zap.Logger, rpcAPI modshared.RPCAPI, stream grpc.ServerStream) *wrappingCallback {
return &wrappingCallback{
log: log,
rpcAPI: rpcAPI,
stream: stream,
}
}
func (c *wrappingCallback) Header(md map[string]*prototool.Values) error {
return c.sendMsg("SendMsg(GatewayResponse_Header) failed", &rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_Header_{
Header: &rpc.GatewayResponse_Header{
Meta: md,
},
},
})
}
func (c *wrappingCallback) Message(data []byte) error {
return c.sendMsg("SendMsg(GatewayResponse_Message) failed", &rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_Message_{
Message: &rpc.GatewayResponse_Message{
Data: data,
},
},
})
}
func (c *wrappingCallback) Trailer(md map[string]*prototool.Values) error {
return c.sendMsg("SendMsg(GatewayResponse_Trailer) failed", &rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_Trailer_{
Trailer: &rpc.GatewayResponse_Trailer{
Meta: md,
},
},
})
}
func (c *wrappingCallback) Error(stat *statuspb.Status) error {
return c.sendMsg("SendMsg(GatewayResponse_Error) failed", &rpc.GatewayResponse{
Msg: &rpc.GatewayResponse_Error_{
Error: &rpc.GatewayResponse_Error{
Status: stat,
},
},
})
}
func (c *wrappingCallback) sendMsg(errMsg string, msg *rpc.GatewayResponse) error {
err := c.stream.SendMsg(msg)
if err != nil {
return c.rpcAPI.HandleIOError(c.log, errMsg, err)
}
return nil
}
|
