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node.go
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node.go
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package controlapi
import (
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/identity"
"github.com/docker/swarmkit/manager/state/store"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
func validateNodeSpec(spec *api.NodeSpec) error {
if spec == nil {
return grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
return nil
}
// GetNode returns a Node given a NodeID.
// - Returns `InvalidArgument` if NodeID is not provided.
// - Returns `NotFound` if the Node is not found.
func (s *Server) GetNode(ctx context.Context, request *api.GetNodeRequest) (*api.GetNodeResponse, error) {
if request.NodeID == "" {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
var node *api.Node
s.store.View(func(tx store.ReadTx) {
node = store.GetNode(tx, request.NodeID)
})
if node == nil {
return nil, grpc.Errorf(codes.NotFound, "node %s not found", request.NodeID)
}
if s.raft != nil {
memberlist := s.raft.GetMemberlist()
raftID, err := identity.ParseNodeID(request.NodeID)
if err == nil && memberlist[raftID] != nil {
node.Manager = &api.Manager{Raft: *memberlist[raftID]}
}
}
return &api.GetNodeResponse{
Node: node,
}, nil
}
func filterNodes(candidates []*api.Node, filters ...func(*api.Node) bool) []*api.Node {
result := []*api.Node{}
for _, c := range candidates {
match := true
for _, f := range filters {
if !f(c) {
match = false
break
}
}
if match {
result = append(result, c)
}
}
return result
}
// ListNodes returns a list of all nodes.
func (s *Server) ListNodes(ctx context.Context, request *api.ListNodesRequest) (*api.ListNodesResponse, error) {
var (
nodes []*api.Node
err error
)
s.store.View(func(tx store.ReadTx) {
switch {
case request.Filters != nil && len(request.Filters.Names) > 0:
nodes, err = store.FindNodes(tx, buildFilters(store.ByName, request.Filters.Names))
case request.Filters != nil && len(request.Filters.IDPrefixes) > 0:
nodes, err = store.FindNodes(tx, buildFilters(store.ByIDPrefix, request.Filters.IDPrefixes))
case request.Filters != nil && len(request.Filters.Roles) > 0:
filters := make([]store.By, 0, len(request.Filters.Roles))
for _, v := range request.Filters.Roles {
filters = append(filters, store.ByRole(v))
}
nodes, err = store.FindNodes(tx, store.Or(filters...))
case request.Filters != nil && len(request.Filters.Memberships) > 0:
filters := make([]store.By, 0, len(request.Filters.Memberships))
for _, v := range request.Filters.Memberships {
filters = append(filters, store.ByMembership(v))
}
nodes, err = store.FindNodes(tx, store.Or(filters...))
default:
nodes, err = store.FindNodes(tx, store.All)
}
})
if err != nil {
return nil, err
}
if request.Filters != nil {
nodes = filterNodes(nodes,
func(e *api.Node) bool {
if len(request.Filters.Names) == 0 {
return true
}
if e.Description == nil {
return false
}
return filterContains(e.Description.Hostname, request.Filters.Names)
},
func(e *api.Node) bool {
return filterContainsPrefix(e.ID, request.Filters.IDPrefixes)
},
func(e *api.Node) bool {
if len(request.Filters.Labels) == 0 {
return true
}
if e.Description == nil {
return false
}
return filterMatchLabels(e.Description.Engine.Labels, request.Filters.Labels)
},
func(e *api.Node) bool {
if len(request.Filters.Roles) == 0 {
return true
}
for _, c := range request.Filters.Roles {
if c == e.Spec.Role {
return true
}
}
return false
},
func(e *api.Node) bool {
if len(request.Filters.Memberships) == 0 {
return true
}
for _, c := range request.Filters.Memberships {
if c == e.Spec.Membership {
return true
}
}
return false
},
)
}
// Add in manager information on nodes that are managers
if s.raft != nil {
memberlist := s.raft.GetMemberlist()
for _, n := range nodes {
raftID, err := identity.ParseNodeID(n.ID)
if err == nil && memberlist[raftID] != nil {
n.Manager = &api.Manager{Raft: *memberlist[raftID]}
}
}
}
return &api.ListNodesResponse{
Nodes: nodes,
}, nil
}
// UpdateNode updates a Node referenced by NodeID with the given NodeSpec.
// - Returns `NotFound` if the Node is not found.
// - Returns `InvalidArgument` if the NodeSpec is malformed.
// - Returns an error if the update fails.
func (s *Server) UpdateNode(ctx context.Context, request *api.UpdateNodeRequest) (*api.UpdateNodeResponse, error) {
if request.NodeID == "" || request.NodeVersion == nil {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if err := validateNodeSpec(request.Spec); err != nil {
return nil, err
}
var node *api.Node
err := s.store.Update(func(tx store.Tx) error {
node = store.GetNode(tx, request.NodeID)
if node == nil {
return nil
}
node.Meta.Version = *request.NodeVersion
node.Spec = *request.Spec.Copy()
return store.UpdateNode(tx, node)
})
if err != nil {
return nil, err
}
if node == nil {
return nil, grpc.Errorf(codes.NotFound, "node %s not found", request.NodeID)
}
return &api.UpdateNodeResponse{
Node: node,
}, nil
}
// RemoveNode updates a Node referenced by NodeID with the given NodeSpec.
// - Returns NotFound if the Node is not found.
// - Returns FailedPrecondition if the Node has manager role or not shut down.
// - Returns InvalidArgument if NodeID or NodeVersion is not valid.
// - Returns an error if the delete fails.
func (s *Server) RemoveNode(ctx context.Context, request *api.RemoveNodeRequest) (*api.RemoveNodeResponse, error) {
if request.NodeID == "" {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if s.raft != nil {
memberlist := s.raft.GetMemberlist()
raftID, err := identity.ParseNodeID(request.NodeID)
if err == nil && memberlist[raftID] != nil {
return nil, grpc.Errorf(codes.FailedPrecondition, "node %s is a cluster manager and is part of the quorum. It must be demoted to worker before removal", request.NodeID)
}
}
err := s.store.Update(func(tx store.Tx) error {
node := store.GetNode(tx, request.NodeID)
if node == nil {
return grpc.Errorf(codes.NotFound, "node %s not found", request.NodeID)
}
if node.Spec.Role == api.NodeRoleManager {
return grpc.Errorf(codes.FailedPrecondition, "node %s role is set to manager. It should be demoted to worker for safe removal", request.NodeID)
}
if node.Status.State == api.NodeStatus_READY {
return grpc.Errorf(codes.FailedPrecondition, "node %s is not down and can't be removed", request.NodeID)
}
return store.DeleteNode(tx, request.NodeID)
})
if err != nil {
return nil, err
}
return &api.RemoveNodeResponse{}, nil
}