mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-25 07:29:38 -05:00
273 lines
9.7 KiB
Go
273 lines
9.7 KiB
Go
package pubapi
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import (
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"context"
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"net"
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"time"
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"github.com/edgelesssys/constellation/coordinator/peer"
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"github.com/edgelesssys/constellation/coordinator/pubapi/pubproto"
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"github.com/edgelesssys/constellation/coordinator/role"
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"github.com/edgelesssys/constellation/coordinator/state"
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"github.com/edgelesssys/constellation/coordinator/vpnapi/vpnproto"
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"github.com/edgelesssys/constellation/internal/deploy/ssh"
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"go.uber.org/zap"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
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)
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/*
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+-------------+ +-------+
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| coordinator | | node |
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+-------------+ +-------+
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| initial request |
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|-------------------->|
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| | -------------------------------------------\
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| |-| update state "NodeWaitingForClusterJoin" |
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| | |------------------------------------------|
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| | ------------\
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| |-| setup VPN |
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| | |-----------|
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| | ---------------------\
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| |-| persist node state |
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| | |--------------------|
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| state disk uuid |
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|<--------------------|
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------------------------\ | |
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| derive state disk key |-| |
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|-----------------------| | |
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| state disk key |
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|-------------------->|
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| | -------------------------------\
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| |-| update state disk passphrase |
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| | |------------------------------|
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| VPN public key |
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|<--------------------|
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*/
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// ActivateAsNode is the RPC call to activate a Node.
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func (a *API) ActivateAsNode(stream pubproto.API_ActivateAsNodeServer) (reterr error) {
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a.mut.Lock()
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defer a.mut.Unlock()
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if err := a.core.RequireState(state.AcceptingInit); err != nil {
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return status.Errorf(codes.FailedPrecondition, "node is not in required state for activation: %v", err)
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}
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/*
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coordinator -> initial request -> node
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*/
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message, err := stream.Recv()
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if err != nil {
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return status.Errorf(codes.Internal, "could not receive initial request from coordinator: %v", err)
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}
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initialRequest, ok := message.GetRequest().(*pubproto.ActivateAsNodeRequest_InitialRequest)
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if !ok {
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return status.Error(codes.Internal, "expected initial request but got different message type")
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}
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in := initialRequest.InitialRequest
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if len(in.OwnerId) == 0 || len(in.ClusterId) == 0 {
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a.logger.Error("missing data to taint worker node as initialized")
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return status.Error(codes.InvalidArgument, "missing data to taint worker node as initialized")
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}
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// If any of the following actions fail, we cannot revert.
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// Thus, mark this peer as failed.
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defer func() {
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if reterr != nil {
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_ = a.core.AdvanceState(state.Failed, nil, nil)
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}
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}()
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// AdvanceState MUST be called before any other functions that are not sanity checks or otherwise required
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// This ensures the node is marked as initialzed before the node is in a state that allows code execution
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// Any new additions to ActivateAsNode MUST come after
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if err := a.core.AdvanceState(state.NodeWaitingForClusterJoin, in.OwnerId, in.ClusterId); err != nil {
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return status.Errorf(codes.Internal, "advance node state: %v", err)
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}
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// Setup SSH users for the node, if defined
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if len(in.SshUserKeys) != 0 {
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sshUserKeys := ssh.FromProtoSlice(in.SshUserKeys)
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if err := a.core.CreateSSHUsers(sshUserKeys); err != nil {
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return status.Errorf(codes.Internal, "creating SSH users on node: %v", err)
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}
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}
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vpnPubKey, err := a.core.GetVPNPubKey()
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if err != nil {
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return status.Errorf(codes.Internal, "get vpn publicKey: %v", err)
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}
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if err := a.core.SetVPNIP(in.NodeVpnIp); err != nil {
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return status.Errorf(codes.Internal, "setting node vpn IP address: %v", err)
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}
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// add initial peers
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if err := a.core.UpdatePeers(peer.FromPubProto(in.Peers)); err != nil {
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return status.Errorf(codes.Internal, "synchronizing peers with vpn state: %v", err)
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}
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// persist node state on disk
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if err := a.core.PersistNodeState(role.Node, in.NodeVpnIp, in.OwnerId, in.ClusterId); err != nil {
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return status.Errorf(codes.Internal, "persist node state: %v", err)
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}
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/*
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coordinator <- state disk uuid <- node
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*/
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diskUUID, err := a.core.GetDiskUUID()
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if err != nil {
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return status.Errorf(codes.Internal, "get disk uuid: %v", err)
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}
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if err := stream.Send(&pubproto.ActivateAsNodeResponse{
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Response: &pubproto.ActivateAsNodeResponse_StateDiskUuid{StateDiskUuid: diskUUID},
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}); err != nil {
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return status.Errorf(codes.Internal, "%v", err)
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}
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/*
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coordinator -> state disk key -> node
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*/
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message, err = stream.Recv()
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if err != nil {
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return status.Errorf(codes.Internal, "could not receive state disk key from coordinator: %v", err)
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}
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diskKey, ok := message.GetRequest().(*pubproto.ActivateAsNodeRequest_StateDiskKey)
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if !ok {
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return status.Error(codes.Internal, "expected state disk key but got different message type")
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}
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if diskKey.StateDiskKey == nil {
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return status.Error(codes.Internal, "empty state disk key message from coordinator")
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}
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if err := a.core.UpdateDiskPassphrase(string(diskKey.StateDiskKey)); err != nil {
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return status.Errorf(codes.Internal, "%v", err)
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}
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// regularly get (peer) updates from Coordinator
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a.StartUpdateLoop()
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/*
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coordinator <- VPN public key <- node
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*/
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if err := stream.Send(&pubproto.ActivateAsNodeResponse{
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Response: &pubproto.ActivateAsNodeResponse_NodeVpnPubKey{
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NodeVpnPubKey: vpnPubKey,
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},
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}); err != nil {
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return status.Errorf(codes.Internal, "%v", err)
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}
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return nil
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}
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// JoinCluster is the RPC call to request this node to join the cluster.
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func (a *API) JoinCluster(ctx context.Context, in *pubproto.JoinClusterRequest) (*pubproto.JoinClusterResponse, error) {
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a.mut.Lock()
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defer a.mut.Unlock()
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if err := a.core.RequireState(state.NodeWaitingForClusterJoin); err != nil {
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return nil, status.Errorf(codes.FailedPrecondition, "node is not in required state for cluster join: %v", err)
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}
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conn, err := a.dialer.DialInsecure(ctx, net.JoinHostPort(in.CoordinatorVpnIp, vpnAPIPort))
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if err != nil {
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return nil, status.Errorf(codes.Unavailable, "dial coordinator: %v", err)
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}
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resp, err := vpnproto.NewAPIClient(conn).GetK8SJoinArgs(ctx, &vpnproto.GetK8SJoinArgsRequest{})
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conn.Close()
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if err != nil {
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return nil, status.Errorf(codes.Internal, "request K8s join string: %v", err)
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}
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err = a.core.JoinCluster(context.TODO(), &kubeadm.BootstrapTokenDiscovery{
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APIServerEndpoint: resp.ApiServerEndpoint,
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Token: resp.Token,
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CACertHashes: []string{resp.DiscoveryTokenCaCertHash},
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}, "", role.Node)
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if err != nil {
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_ = a.core.AdvanceState(state.Failed, nil, nil)
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return nil, status.Errorf(codes.Internal, "joining Kubernetes cluster: %v", err)
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}
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if err := a.core.AdvanceState(state.IsNode, nil, nil); err != nil {
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return nil, status.Errorf(codes.Internal, "advance state to IsNode: %v", err)
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}
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return &pubproto.JoinClusterResponse{}, nil
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}
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// TriggerNodeUpdate is the RPC call to request this node to get an update from the Coordinator.
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func (a *API) TriggerNodeUpdate(ctx context.Context, in *pubproto.TriggerNodeUpdateRequest) (*pubproto.TriggerNodeUpdateResponse, error) {
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if err := a.core.RequireState(state.IsNode); err != nil {
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return nil, status.Errorf(codes.FailedPrecondition, "node is not in required state for receiving update command: %v", err)
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}
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if err := a.update(ctx); err != nil {
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return nil, status.Errorf(codes.Internal, "node update: %v", err)
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}
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return &pubproto.TriggerNodeUpdateResponse{}, nil
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}
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// StartUpdateLoop starts a loop that will periodically request updates from the Coordinator.
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func (a *API) StartUpdateLoop() {
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a.wgClose.Add(1)
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go a.updateLoop()
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}
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func (a *API) updateLoop() {
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defer a.wgClose.Done()
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ticker := time.NewTicker(updateInterval)
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for {
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if err := a.update(context.Background()); err != nil {
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a.logger.Error("updateLoop: update failed", zap.Error(err))
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}
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select {
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case <-a.stopUpdate:
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ticker.Stop()
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return
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case <-ticker.C:
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}
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}
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}
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func (a *API) update(ctx context.Context) error {
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a.mut.Lock()
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defer a.mut.Unlock()
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ctx, cancel := context.WithTimeout(ctx, deadlineDuration)
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defer cancel()
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// TODO: replace hardcoded IP
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conn, err := a.dialer.DialInsecure(ctx, net.JoinHostPort("10.118.0.1", vpnAPIPort))
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if err != nil {
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return err
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}
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resp, err := vpnproto.NewAPIClient(conn).GetUpdate(ctx, &vpnproto.GetUpdateRequest{ResourceVersion: int64(a.resourceVersion)})
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conn.Close()
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if err != nil {
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return err
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}
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resourceVersion := int(resp.ResourceVersion)
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if resourceVersion == a.resourceVersion {
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return nil
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}
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// TODO does this naive approach of performing full updates everytime need to be replaced by something more clever like watches in K8s?
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// https://kubernetes.io/docs/reference/using-api/api-concepts/#efficient-detection-of-changes
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if err := a.core.UpdatePeers(peer.FromVPNProto(resp.Peers)); err != nil {
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return err
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}
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a.resourceVersion = resourceVersion
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return nil
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}
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