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client_csi_endpoint.go
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client_csi_endpoint.go
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package nomad
import (
"fmt"
"math/rand"
"time"
metrics "github.com/armon/go-metrics"
log "github.com/hashicorp/go-hclog"
memdb "github.com/hashicorp/go-memdb"
cstructs "github.com/hashicorp/nomad/client/structs"
)
// ClientCSI is used to forward RPC requests to the targed Nomad client's
// CSIController endpoint.
type ClientCSI struct {
srv *Server
logger log.Logger
}
func (a *ClientCSI) ControllerAttachVolume(args *cstructs.ClientCSIControllerAttachVolumeRequest, reply *cstructs.ClientCSIControllerAttachVolumeResponse) error {
defer metrics.MeasureSince([]string{"nomad", "client_csi_controller", "attach_volume"}, time.Now())
// Get a Nomad client node for the controller
nodeID, err := a.nodeForController(args.PluginID, args.ControllerNodeID)
if err != nil {
return err
}
args.ControllerNodeID = nodeID
// Get the connection to the client
state, ok := a.srv.getNodeConn(args.ControllerNodeID)
if !ok {
return findNodeConnAndForward(a.srv, args.ControllerNodeID, "ClientCSI.ControllerAttachVolume", args, reply)
}
// Make the RPC
err = NodeRpc(state.Session, "CSI.ControllerAttachVolume", args, reply)
if err != nil {
return fmt.Errorf("controller attach volume: %v", err)
}
return nil
}
func (a *ClientCSI) ControllerValidateVolume(args *cstructs.ClientCSIControllerValidateVolumeRequest, reply *cstructs.ClientCSIControllerValidateVolumeResponse) error {
defer metrics.MeasureSince([]string{"nomad", "client_csi_controller", "validate_volume"}, time.Now())
// Get a Nomad client node for the controller
nodeID, err := a.nodeForController(args.PluginID, args.ControllerNodeID)
if err != nil {
return err
}
args.ControllerNodeID = nodeID
// Get the connection to the client
state, ok := a.srv.getNodeConn(args.ControllerNodeID)
if !ok {
return findNodeConnAndForward(a.srv, args.ControllerNodeID, "ClientCSI.ControllerValidateVolume", args, reply)
}
// Make the RPC
err = NodeRpc(state.Session, "CSI.ControllerValidateVolume", args, reply)
if err != nil {
return fmt.Errorf("validate volume: %v", err)
}
return nil
}
func (a *ClientCSI) ControllerDetachVolume(args *cstructs.ClientCSIControllerDetachVolumeRequest, reply *cstructs.ClientCSIControllerDetachVolumeResponse) error {
defer metrics.MeasureSince([]string{"nomad", "client_csi_controller", "detach_volume"}, time.Now())
// Get a Nomad client node for the controller
nodeID, err := a.nodeForController(args.PluginID, args.ControllerNodeID)
if err != nil {
return err
}
args.ControllerNodeID = nodeID
// Get the connection to the client
state, ok := a.srv.getNodeConn(args.ControllerNodeID)
if !ok {
return findNodeConnAndForward(a.srv, args.ControllerNodeID, "ClientCSI.ControllerDetachVolume", args, reply)
}
// Make the RPC
err = NodeRpc(state.Session, "CSI.ControllerDetachVolume", args, reply)
if err != nil {
return fmt.Errorf("controller detach volume: %v", err)
}
return nil
}
func (a *ClientCSI) NodeDetachVolume(args *cstructs.ClientCSINodeDetachVolumeRequest, reply *cstructs.ClientCSINodeDetachVolumeResponse) error {
defer metrics.MeasureSince([]string{"nomad", "client_csi_node", "detach_volume"}, time.Now())
// Make sure Node is valid and new enough to support RPC
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
_, err = getNodeForRpc(snap, args.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(args.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, args.NodeID, "ClientCSI.NodeDetachVolume", args, reply)
}
// Make the RPC
err = NodeRpc(state.Session, "CSI.NodeDetachVolume", args, reply)
if err != nil {
return fmt.Errorf("node detach volume: %v", err)
}
return nil
}
// nodeForController validates that the Nomad client node ID for
// a plugin exists and is new enough to support client RPC. If no node
// ID is passed, select a random node ID for the controller to load-balance
// long blocking RPCs across client nodes.
func (a *ClientCSI) nodeForController(pluginID, nodeID string) (string, error) {
snap, err := a.srv.State().Snapshot()
if err != nil {
return "", err
}
if nodeID != "" {
_, err = getNodeForRpc(snap, nodeID)
if err == nil {
return nodeID, nil
}
}
if pluginID == "" {
return "", fmt.Errorf("missing plugin ID")
}
ws := memdb.NewWatchSet()
// note: plugin IDs are not scoped to region/DC but volumes are.
// so any node we get for a controller is already in the same
// region/DC for the volume.
plugin, err := snap.CSIPluginByID(ws, pluginID)
if err != nil {
return "", fmt.Errorf("error getting plugin: %s, %v", pluginID, err)
}
if plugin == nil {
return "", fmt.Errorf("plugin missing: %s %v", pluginID, err)
}
count := len(plugin.Controllers)
if count == 0 {
return "", fmt.Errorf("no controllers available for plugin %q", plugin.ID)
}
// iterating maps is "random" but unspecified and isn't particularly
// random with small maps, so not well-suited for load balancing.
// so we shuffle the keys and iterate over them.
clientIDs := make([]string, count)
for clientID := range plugin.Controllers {
clientIDs = append(clientIDs, clientID)
}
rand.Shuffle(count, func(i, j int) {
clientIDs[i], clientIDs[j] = clientIDs[j], clientIDs[i]
})
for _, clientID := range clientIDs {
controller := plugin.Controllers[clientID]
if !controller.IsController() {
// we don't have separate types for CSIInfo depending on
// whether it's a controller or node. this error shouldn't
// make it to production but is to aid developers during
// development
err = fmt.Errorf("plugin is not a controller")
continue
}
_, err = getNodeForRpc(snap, clientID)
if err != nil {
continue
}
return clientID, nil
}
return "", err
}