DockerCLI/cli/command/service/generic_resource_opts.go

106 lines
3.1 KiB
Go

package service
import (
"fmt"
"strings"
"github.com/pkg/errors"
"github.com/docker/docker/api/types/swarm"
swarmapi "github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/api/genericresource"
)
// GenericResource is a concept that a user can use to advertise user-defined
// resources on a node and thus better place services based on these resources.
// E.g: NVIDIA GPUs, Intel FPGAs, ...
// See https://github.com/docker/swarmkit/blob/master/design/generic_resources.md
// ValidateSingleGenericResource validates that a single entry in the
// generic resource list is valid.
// i.e 'GPU=UID1' is valid however 'GPU:UID1' or 'UID1' isn't
func ValidateSingleGenericResource(val string) (string, error) {
if strings.Count(val, "=") < 1 {
return "", fmt.Errorf("invalid generic-resource format `%s` expected `name=value`", val)
}
return val, nil
}
// ParseGenericResources parses an array of Generic resourceResources
// Requesting Named Generic Resources for a service is not supported this
// is filtered here.
func ParseGenericResources(value []string) ([]swarm.GenericResource, error) {
if len(value) == 0 {
return nil, nil
}
resources, err := genericresource.Parse(value)
if err != nil {
return nil, errors.Wrapf(err, "invalid generic resource specification")
}
swarmResources := genericResourcesFromGRPC(resources)
for _, res := range swarmResources {
if res.NamedResourceSpec != nil {
return nil, fmt.Errorf("invalid generic-resource request `%s=%s`, Named Generic Resources is not supported for service create or update", res.NamedResourceSpec.Kind, res.NamedResourceSpec.Value)
}
}
return swarmResources, nil
}
// genericResourcesFromGRPC converts a GRPC GenericResource to a GenericResource
func genericResourcesFromGRPC(genericRes []*swarmapi.GenericResource) []swarm.GenericResource {
var generic []swarm.GenericResource
for _, res := range genericRes {
var current swarm.GenericResource
switch r := res.Resource.(type) {
case *swarmapi.GenericResource_DiscreteResourceSpec:
current.DiscreteResourceSpec = &swarm.DiscreteGenericResource{
Kind: r.DiscreteResourceSpec.Kind,
Value: r.DiscreteResourceSpec.Value,
}
case *swarmapi.GenericResource_NamedResourceSpec:
current.NamedResourceSpec = &swarm.NamedGenericResource{
Kind: r.NamedResourceSpec.Kind,
Value: r.NamedResourceSpec.Value,
}
}
generic = append(generic, current)
}
return generic
}
func buildGenericResourceMap(genericRes []swarm.GenericResource) (map[string]swarm.GenericResource, error) {
m := make(map[string]swarm.GenericResource)
for _, res := range genericRes {
if res.DiscreteResourceSpec == nil {
return nil, fmt.Errorf("invalid generic-resource `%+v` for service task", res)
}
_, ok := m[res.DiscreteResourceSpec.Kind]
if ok {
return nil, fmt.Errorf("duplicate generic-resource `%+v` for service task", res.DiscreteResourceSpec.Kind)
}
m[res.DiscreteResourceSpec.Kind] = res
}
return m, nil
}
func buildGenericResourceList(genericRes map[string]swarm.GenericResource) []swarm.GenericResource {
var l []swarm.GenericResource
for _, res := range genericRes {
l = append(l, res)
}
return l
}