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service.go
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service.go
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package controlapi
import (
"errors"
"reflect"
"strconv"
"github.com/docker/engine-api/types/reference"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/identity"
"github.com/docker/swarmkit/manager/scheduler"
"github.com/docker/swarmkit/manager/state/store"
"github.com/docker/swarmkit/protobuf/ptypes"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
var (
errNetworkUpdateNotSupported = errors.New("changing network in service is not supported")
errModeChangeNotAllowed = errors.New("service mode change is not allowed")
)
func validateResources(r *api.Resources) error {
if r == nil {
return nil
}
if r.NanoCPUs != 0 && r.NanoCPUs < 1e6 {
return grpc.Errorf(codes.InvalidArgument, "invalid cpu value %g: Must be at least %g", float64(r.NanoCPUs)/1e9, 1e6/1e9)
}
if r.MemoryBytes != 0 && r.MemoryBytes < 4*1024*1024 {
return grpc.Errorf(codes.InvalidArgument, "invalid memory value %d: Must be at least 4MiB", r.MemoryBytes)
}
return nil
}
func validateResourceRequirements(r *api.ResourceRequirements) error {
if r == nil {
return nil
}
if err := validateResources(r.Limits); err != nil {
return err
}
if err := validateResources(r.Reservations); err != nil {
return err
}
return nil
}
func validateRestartPolicy(rp *api.RestartPolicy) error {
if rp == nil {
return nil
}
if rp.Delay != nil {
delay, err := ptypes.Duration(rp.Delay)
if err != nil {
return err
}
if delay < 0 {
return grpc.Errorf(codes.InvalidArgument, "TaskSpec: restart-delay cannot be negative")
}
}
if rp.Window != nil {
win, err := ptypes.Duration(rp.Window)
if err != nil {
return err
}
if win < 0 {
return grpc.Errorf(codes.InvalidArgument, "TaskSpec: restart-window cannot be negative")
}
}
return nil
}
func validatePlacement(placement *api.Placement) error {
if placement == nil {
return nil
}
_, err := scheduler.ParseExprs(placement.Constraints)
return err
}
func validateUpdate(uc *api.UpdateConfig) error {
if uc == nil {
return nil
}
delay, err := ptypes.Duration(&uc.Delay)
if err != nil {
return err
}
if delay < 0 {
return grpc.Errorf(codes.InvalidArgument, "TaskSpec: update-delay cannot be negative")
}
return nil
}
func validateTask(taskSpec api.TaskSpec) error {
if err := validateResourceRequirements(taskSpec.Resources); err != nil {
return err
}
if err := validateRestartPolicy(taskSpec.Restart); err != nil {
return err
}
if err := validatePlacement(taskSpec.Placement); err != nil {
return err
}
if taskSpec.GetRuntime() == nil {
return grpc.Errorf(codes.InvalidArgument, "TaskSpec: missing runtime")
}
_, ok := taskSpec.GetRuntime().(*api.TaskSpec_Container)
if !ok {
return grpc.Errorf(codes.Unimplemented, "RuntimeSpec: unimplemented runtime in service spec")
}
container := taskSpec.GetContainer()
if container == nil {
return grpc.Errorf(codes.InvalidArgument, "ContainerSpec: missing in service spec")
}
if container.Image == "" {
return grpc.Errorf(codes.InvalidArgument, "ContainerSpec: image reference must be provided")
}
if _, _, err := reference.Parse(container.Image); err != nil {
return grpc.Errorf(codes.InvalidArgument, "ContainerSpec: %q is not a valid repository/tag", container.Image)
}
return nil
}
func validateEndpointSpec(epSpec *api.EndpointSpec) error {
// Endpoint spec is optional
if epSpec == nil {
return nil
}
if len(epSpec.Ports) > 0 && epSpec.Mode == api.ResolutionModeDNSRoundRobin {
return grpc.Errorf(codes.InvalidArgument, "EndpointSpec: ports can't be used with dnsrr mode")
}
portSet := make(map[api.PortConfig]struct{})
for _, port := range epSpec.Ports {
if _, ok := portSet[*port]; ok {
return grpc.Errorf(codes.InvalidArgument, "EndpointSpec: duplicate ports provided")
}
portSet[*port] = struct{}{}
}
return nil
}
func validateServiceSpec(spec *api.ServiceSpec) error {
if spec == nil {
return grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if err := validateAnnotations(spec.Annotations); err != nil {
return err
}
if err := validateTask(spec.Task); err != nil {
return err
}
if err := validateUpdate(spec.Update); err != nil {
return err
}
if err := validateEndpointSpec(spec.Endpoint); err != nil {
return err
}
return nil
}
// checkPortConflicts does a best effort to find if the passed in spec has port
// conflicts with existing services.
func (s *Server) checkPortConflicts(spec *api.ServiceSpec) error {
if spec.Endpoint == nil {
return nil
}
pcToString := func(pc *api.PortConfig) string {
port := strconv.FormatUint(uint64(pc.PublishedPort), 10)
return port + "/" + pc.Protocol.String()
}
reqPorts := make(map[string]bool)
for _, pc := range spec.Endpoint.Ports {
if pc.PublishedPort > 0 {
reqPorts[pcToString(pc)] = true
}
}
if len(reqPorts) == 0 {
return nil
}
var (
services []*api.Service
err error
)
s.store.View(func(tx store.ReadTx) {
services, err = store.FindServices(tx, store.All)
})
if err != nil {
return err
}
for _, service := range services {
if service.Spec.Endpoint != nil {
for _, pc := range service.Spec.Endpoint.Ports {
if reqPorts[pcToString(pc)] {
return grpc.Errorf(codes.InvalidArgument, "port '%d' is already in use by service %s", pc.PublishedPort, service.ID)
}
}
}
if service.Endpoint != nil {
for _, pc := range service.Endpoint.Ports {
if reqPorts[pcToString(pc)] {
return grpc.Errorf(codes.InvalidArgument, "port '%d' is already in use by service %s", pc.PublishedPort, service.ID)
}
}
}
}
return nil
}
// CreateService creates and return a Service based on the provided ServiceSpec.
// - Returns `InvalidArgument` if the ServiceSpec is malformed.
// - Returns `Unimplemented` if the ServiceSpec references unimplemented features.
// - Returns `AlreadyExists` if the ServiceID conflicts.
// - Returns an error if the creation fails.
func (s *Server) CreateService(ctx context.Context, request *api.CreateServiceRequest) (*api.CreateServiceResponse, error) {
if err := validateServiceSpec(request.Spec); err != nil {
return nil, err
}
if err := s.checkPortConflicts(request.Spec); err != nil {
return nil, err
}
// TODO(aluzzardi): Consider using `Name` as a primary key to handle
// duplicate creations. See #65
service := &api.Service{
ID: identity.NewID(),
Spec: *request.Spec,
}
err := s.store.Update(func(tx store.Tx) error {
return store.CreateService(tx, service)
})
if err != nil {
return nil, err
}
return &api.CreateServiceResponse{
Service: service,
}, nil
}
// GetService returns a Service given a ServiceID.
// - Returns `InvalidArgument` if ServiceID is not provided.
// - Returns `NotFound` if the Service is not found.
func (s *Server) GetService(ctx context.Context, request *api.GetServiceRequest) (*api.GetServiceResponse, error) {
if request.ServiceID == "" {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
var service *api.Service
s.store.View(func(tx store.ReadTx) {
service = store.GetService(tx, request.ServiceID)
})
if service == nil {
return nil, grpc.Errorf(codes.NotFound, "service %s not found", request.ServiceID)
}
return &api.GetServiceResponse{
Service: service,
}, nil
}
// UpdateService updates a Service referenced by ServiceID with the given ServiceSpec.
// - Returns `NotFound` if the Service is not found.
// - Returns `InvalidArgument` if the ServiceSpec is malformed.
// - Returns `Unimplemented` if the ServiceSpec references unimplemented features.
// - Returns an error if the update fails.
func (s *Server) UpdateService(ctx context.Context, request *api.UpdateServiceRequest) (*api.UpdateServiceResponse, error) {
if request.ServiceID == "" || request.ServiceVersion == nil {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if err := validateServiceSpec(request.Spec); err != nil {
return nil, err
}
var service *api.Service
s.store.View(func(tx store.ReadTx) {
service = store.GetService(tx, request.ServiceID)
})
if service == nil {
return nil, grpc.Errorf(codes.NotFound, "service %s not found", request.ServiceID)
}
if request.Spec.Endpoint != nil && !reflect.DeepEqual(request.Spec.Endpoint, service.Spec.Endpoint) {
if err := s.checkPortConflicts(request.Spec); err != nil {
return nil, err
}
}
err := s.store.Update(func(tx store.Tx) error {
service = store.GetService(tx, request.ServiceID)
if service == nil {
return nil
}
// temporary disable network update
if request.Spec != nil && !reflect.DeepEqual(request.Spec.Networks, service.Spec.Networks) {
return errNetworkUpdateNotSupported
}
// orchestrator is designed to be stateless, so it should not deal
// with service mode change (comparing current config with previous config).
// proper way to change service mode is to delete and re-add.
if request.Spec != nil && reflect.TypeOf(service.Spec.Mode) != reflect.TypeOf(request.Spec.Mode) {
return errModeChangeNotAllowed
}
service.Meta.Version = *request.ServiceVersion
service.Spec = *request.Spec.Copy()
// Reset update status
service.UpdateStatus = nil
return store.UpdateService(tx, service)
})
if err != nil {
return nil, err
}
if service == nil {
return nil, grpc.Errorf(codes.NotFound, "service %s not found", request.ServiceID)
}
return &api.UpdateServiceResponse{
Service: service,
}, nil
}
// RemoveService removes a Service referenced by ServiceID.
// - Returns `InvalidArgument` if ServiceID is not provided.
// - Returns `NotFound` if the Service is not found.
// - Returns an error if the deletion fails.
func (s *Server) RemoveService(ctx context.Context, request *api.RemoveServiceRequest) (*api.RemoveServiceResponse, error) {
if request.ServiceID == "" {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
err := s.store.Update(func(tx store.Tx) error {
return store.DeleteService(tx, request.ServiceID)
})
if err != nil {
if err == store.ErrNotExist {
return nil, grpc.Errorf(codes.NotFound, "service %s not found", request.ServiceID)
}
return nil, err
}
return &api.RemoveServiceResponse{}, nil
}
func filterServices(candidates []*api.Service, filters ...func(*api.Service) bool) []*api.Service {
result := []*api.Service{}
for _, c := range candidates {
match := true
for _, f := range filters {
if !f(c) {
match = false
break
}
}
if match {
result = append(result, c)
}
}
return result
}
// ListServices returns a list of all services.
func (s *Server) ListServices(ctx context.Context, request *api.ListServicesRequest) (*api.ListServicesResponse, error) {
var (
services []*api.Service
err error
)
s.store.View(func(tx store.ReadTx) {
switch {
case request.Filters != nil && len(request.Filters.Names) > 0:
services, err = store.FindServices(tx, buildFilters(store.ByName, request.Filters.Names))
case request.Filters != nil && len(request.Filters.NamePrefixes) > 0:
services, err = store.FindServices(tx, buildFilters(store.ByNamePrefix, request.Filters.NamePrefixes))
case request.Filters != nil && len(request.Filters.IDPrefixes) > 0:
services, err = store.FindServices(tx, buildFilters(store.ByIDPrefix, request.Filters.IDPrefixes))
default:
services, err = store.FindServices(tx, store.All)
}
})
if err != nil {
return nil, err
}
if request.Filters != nil {
services = filterServices(services,
func(e *api.Service) bool {
return filterContains(e.Spec.Annotations.Name, request.Filters.Names)
},
func(e *api.Service) bool {
return filterContainsPrefix(e.Spec.Annotations.Name, request.Filters.NamePrefixes)
},
func(e *api.Service) bool {
return filterContainsPrefix(e.ID, request.Filters.IDPrefixes)
},
func(e *api.Service) bool {
return filterMatchLabels(e.Spec.Annotations.Labels, request.Filters.Labels)
},
)
}
return &api.ListServicesResponse{
Services: services,
}, nil
}