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service.go
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service.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"
"google.golang.org/grpc/metadata"
)
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 %d: Must be at least %d", r.NanoCPUs, 1e6)
}
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 validateServiceSpecTemplate(spec *api.ServiceSpec) error {
if err := validateResourceRequirements(spec.Task.Resources); err != nil {
return err
}
if spec.Task.GetRuntime() == nil {
return grpc.Errorf(codes.InvalidArgument, "TaskSpec: missing runtime")
}
_, ok := spec.Task.GetRuntime().(*api.TaskSpec_Container)
if !ok {
return grpc.Errorf(codes.Unimplemented, "RuntimeSpec: unimplemented runtime in service spec")
}
container := spec.Task.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")
}
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 := validateServiceSpecTemplate(spec); err != nil {
return err
}
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
}
md, ok := metadata.FromContext(ctx)
if ok {
// retrieve registry auth from the metadata and update if non-empty
registryAuth, exists := md["x-registry-auth"]
// TODO(nishanttotla): We don't want to modify the spec. This is a temporary fix
// and should go away eventually
if exists {
request.Spec.Annotations.Labels["com.docker.swarm.registryauth"] = registryAuth[0]
}
}
// 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
}
md, ok := metadata.FromContext(ctx)
if ok {
// retrieve registry auth from the metadata and update if non-empty
registryAuth, exists := md["x-registry-auth"]
// TODO(nishanttotla): We don't want to modify the spec. This is a temporary fix
// and should go away eventually
if exists {
request.Spec.Annotations.Labels["com.docker.swarm.registryauth"] = registryAuth[0]
}
}
var service *api.Service
err := s.store.Update(func(tx store.Tx) error {
service = store.GetService(tx, request.ServiceID)
if service == nil {
return nil
}
service.Meta.Version = *request.ServiceVersion
service.Spec = *request.Spec.Copy()
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.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.ID, request.Filters.IDPrefixes)
},
func(e *api.Service) bool {
return filterMatchLabels(e.Spec.Annotations.Labels, request.Filters.Labels)
},
)
}
return &api.ListServicesResponse{
Services: services,
}, nil
}