envoy: Initial changes

internal/controlplane/xds.go

@@ -0,0 +1,105 @@
+package controlplane
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/pomerium/pomerium/config"
+
+	envoy_config_accesslog_v3 "github.com/envoyproxy/go-control-plane/envoy/config/accesslog/v3"
+	envoy_config_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
+	envoy_extensions_access_loggers_grpc_v3 "github.com/envoyproxy/go-control-plane/envoy/extensions/access_loggers/grpc/v3"
+	envoy_service_discovery_v3 "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
+	"github.com/golang/protobuf/ptypes"
+	"github.com/golang/protobuf/ptypes/any"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func (srv *Server) buildDiscoveryResponse(version string, typeURL string, options config.Options) (*envoy_service_discovery_v3.DiscoveryResponse, error) {
+	switch typeURL {
+	case "type.googleapis.com/envoy.config.listener.v3.Listener":
+		listeners := srv.buildListeners(options)
+		anys := make([]*any.Any, len(listeners))
+		for i, listener := range listeners {
+			a, err := ptypes.MarshalAny(listener)
+			if err != nil {
+				return nil, status.Errorf(codes.Internal, "error marshaling type to any: %v", err)
+			}
+			anys[i] = a
+		}
+		return &envoy_service_discovery_v3.DiscoveryResponse{
+			VersionInfo: version,
+			Resources:   anys,
+			TypeUrl:     typeURL,
+		}, nil
+	case "type.googleapis.com/envoy.config.cluster.v3.Cluster":
+		clusters := srv.buildClusters(options)
+		anys := make([]*any.Any, len(clusters))
+		for i, cluster := range clusters {
+			a, err := ptypes.MarshalAny(cluster)
+			if err != nil {
+				return nil, status.Errorf(codes.Internal, "error marshaling type to any: %v", err)
+			}
+			anys[i] = a
+		}
+		return &envoy_service_discovery_v3.DiscoveryResponse{
+			VersionInfo: version,
+			Resources:   anys,
+			TypeUrl:     typeURL,
+		}, nil
+	default:
+		return nil, status.Errorf(codes.Internal, "received request for unknown discovery request type: %s", typeURL)
+	}
+}
+
+func (srv *Server) buildAccessLog() *envoy_config_accesslog_v3.AccessLog {
+	tc, _ := ptypes.MarshalAny(&envoy_extensions_access_loggers_grpc_v3.HttpGrpcAccessLogConfig{
+		CommonConfig: &envoy_extensions_access_loggers_grpc_v3.CommonGrpcAccessLogConfig{
+			LogName: "ingress-http",
+			GrpcService: &envoy_config_core_v3.GrpcService{
+				TargetSpecifier: &envoy_config_core_v3.GrpcService_EnvoyGrpc_{
+					EnvoyGrpc: &envoy_config_core_v3.GrpcService_EnvoyGrpc{
+						ClusterName: "pomerium-control-plane-grpc",
+					},
+				},
+			},
+		},
+	})
+	return &envoy_config_accesslog_v3.AccessLog{
+		Name:       "envoy.access_loggers.http_grpc",
+		ConfigType: &envoy_config_accesslog_v3.AccessLog_TypedConfig{TypedConfig: tc},
+	}
+}
+
+func buildAddress(hostport string, defaultPort int) *envoy_config_core_v3.Address {
+	host, strport, err := net.SplitHostPort(hostport)
+	if err != nil {
+		host = hostport
+		strport = fmt.Sprint(defaultPort)
+	}
+	port, err := strconv.Atoi(strport)
+	if err != nil {
+		port = defaultPort
+	}
+	if host == "" {
+		host = "0.0.0.0"
+	}
+	return &envoy_config_core_v3.Address{
+		Address: &envoy_config_core_v3.Address_SocketAddress{SocketAddress: &envoy_config_core_v3.SocketAddress{
+			Address:       host,
+			PortSpecifier: &envoy_config_core_v3.SocketAddress_PortValue{PortValue: uint32(port)},
+		}},
+	}
+}
+
+func getAbsoluteFilePath(filename string) string {
+	if filepath.IsAbs(filename) {
+		return filename
+	}
+	wd, _ := os.Getwd()
+	return filepath.Join(wd, filename)
+}