Remove duplication in compose/convert

Signed-off-by: Daniel Nephin <dnephin@docker.com>

cli/compose/convert/compose.go

@@ -101,18 +101,11 @@ func Secrets(namespace Namespace, secrets map[string]composetypes.SecretConfig)
 			continue
 		}
 
-		data, err := ioutil.ReadFile(secret.File)
+		obj, err := fileObjectConfig(namespace, name, composetypes.FileObjectConfig(secret))
 		if err != nil {
 			return nil, err
 		}
-
-		result = append(result, swarm.SecretSpec{
-			Annotations: swarm.Annotations{
-				Name:   namespace.Scope(name),
-				Labels: AddStackLabel(namespace, secret.Labels),
-			},
-			Data: data,
-		})
+		result = append(result, swarm.SecretSpec{Annotations: obj.Annotations, Data: obj.Data})
 	}
 	return result, nil
 }
@@ -125,18 +118,31 @@ func Configs(namespace Namespace, configs map[string]composetypes.ConfigObjConfi
 			continue
 		}
 
-		data, err := ioutil.ReadFile(config.File)
+		obj, err := fileObjectConfig(namespace, name, composetypes.FileObjectConfig(config))
 		if err != nil {
 			return nil, err
 		}
-
-		result = append(result, swarm.ConfigSpec{
-			Annotations: swarm.Annotations{
-				Name:   namespace.Scope(name),
-				Labels: AddStackLabel(namespace, config.Labels),
-			},
-			Data: data,
-		})
+		result = append(result, swarm.ConfigSpec{Annotations: obj.Annotations, Data: obj.Data})
 	}
 	return result, nil
 }
+
+type swarmFileObject struct {
+	Annotations swarm.Annotations
+	Data        []byte
+}
+
+func fileObjectConfig(namespace Namespace, name string, obj composetypes.FileObjectConfig) (swarmFileObject, error) {
+	data, err := ioutil.ReadFile(obj.File)
+	if err != nil {
+		return swarmFileObject{}, err
+	}
+
+	return swarmFileObject{
+		Annotations: swarm.Annotations{
+			Name:   namespace.Scope(name),
+			Labels: AddStackLabel(namespace, obj.Labels),
+		},
+		Data: data,
+	}, nil
+}

cli/compose/convert/service.go

@@ -255,43 +255,24 @@ func convertServiceSecrets(
 	secretSpecs map[string]composetypes.SecretConfig,
 ) ([]*swarm.SecretReference, error) {
 	refs := []*swarm.SecretReference{}
-	for _, secret := range secrets {
-		target := secret.Target
-		if target == "" {
-			target = secret.Source
-		}
 
-		secretSpec, exists := secretSpecs[secret.Source]
+	lookup := func(key string) (composetypes.FileObjectConfig, error) {
+		configSpec, exists := secretSpecs[key]
 		if !exists {
-			return nil, errors.Errorf("undefined secret %q", secret.Source)
-		}
-
-		source := namespace.Scope(secret.Source)
-		if secretSpec.External.External {
-			source = secretSpec.External.Name
-		}
-
-		uid := secret.UID
-		gid := secret.GID
-		if uid == "" {
-			uid = "0"
-		}
-		if gid == "" {
-			gid = "0"
-		}
-		mode := secret.Mode
-		if mode == nil {
-			mode = uint32Ptr(0444)
+			return composetypes.FileObjectConfig{}, errors.Errorf("undefined secret %q", key)
+		}
+		return composetypes.FileObjectConfig(configSpec), nil
+	}
+	for _, config := range secrets {
+		obj, err := convertFileObject(namespace, composetypes.FileReferenceConfig(config), lookup)
+		if err != nil {
+			return nil, err
 		}
 
+		file := swarm.SecretReferenceFileTarget(obj.File)
 		refs = append(refs, &swarm.SecretReference{
-			File: &swarm.SecretReferenceFileTarget{
-				Name: target,
-				UID:  uid,
-				GID:  gid,
-				Mode: os.FileMode(*mode),
-			},
-			SecretName: source,
+			File:       &file,
+			SecretName: obj.Name,
 		})
 	}
 
@@ -312,43 +293,24 @@ func convertServiceConfigObjs(
 	configSpecs map[string]composetypes.ConfigObjConfig,
 ) ([]*swarm.ConfigReference, error) {
 	refs := []*swarm.ConfigReference{}
-	for _, config := range configs {
-		target := config.Target
-		if target == "" {
-			target = config.Source
-		}
 
-		configSpec, exists := configSpecs[config.Source]
+	lookup := func(key string) (composetypes.FileObjectConfig, error) {
+		configSpec, exists := configSpecs[key]
 		if !exists {
-			return nil, errors.Errorf("undefined config %q", config.Source)
-		}
-
-		source := namespace.Scope(config.Source)
-		if configSpec.External.External {
-			source = configSpec.External.Name
-		}
-
-		uid := config.UID
-		gid := config.GID
-		if uid == "" {
-			uid = "0"
-		}
-		if gid == "" {
-			gid = "0"
-		}
-		mode := config.Mode
-		if mode == nil {
-			mode = uint32Ptr(0444)
+			return composetypes.FileObjectConfig{}, errors.Errorf("undefined config %q", key)
+		}
+		return composetypes.FileObjectConfig(configSpec), nil
+	}
+	for _, config := range configs {
+		obj, err := convertFileObject(namespace, composetypes.FileReferenceConfig(config), lookup)
+		if err != nil {
+			return nil, err
 		}
 
+		file := swarm.ConfigReferenceFileTarget(obj.File)
 		refs = append(refs, &swarm.ConfigReference{
-			File: &swarm.ConfigReferenceFileTarget{
-				Name: target,
-				UID:  uid,
-				GID:  gid,
-				Mode: os.FileMode(*mode),
-			},
-			ConfigName: source,
+			File:       &file,
+			ConfigName: obj.Name,
 		})
 	}
 
@@ -361,6 +323,63 @@ func convertServiceConfigObjs(
 	return confs, err
 }
 
+type swarmReferenceTarget struct {
+	Name string
+	UID  string
+	GID  string
+	Mode os.FileMode
+}
+
+type swarmReferenceObject struct {
+	File swarmReferenceTarget
+	ID   string
+	Name string
+}
+
+func convertFileObject(
+	namespace Namespace,
+	config composetypes.FileReferenceConfig,
+	lookup func(key string) (composetypes.FileObjectConfig, error),
+) (swarmReferenceObject, error) {
+	target := config.Target
+	if target == "" {
+		target = config.Source
+	}
+
+	obj, err := lookup(config.Source)
+	if err != nil {
+		return swarmReferenceObject{}, err
+	}
+
+	source := namespace.Scope(config.Source)
+	if obj.External.External {
+		source = obj.External.Name
+	}
+
+	uid := config.UID
+	gid := config.GID
+	if uid == "" {
+		uid = "0"
+	}
+	if gid == "" {
+		gid = "0"
+	}
+	mode := config.Mode
+	if mode == nil {
+		mode = uint32Ptr(0444)
+	}
+
+	return swarmReferenceObject{
+		File: swarmReferenceTarget{
+			Name: target,
+			UID:  uid,
+			GID:  gid,
+			Mode: os.FileMode(*mode),
+		},
+		Name: source,
+	}, nil
+}
+
 func uint32Ptr(value uint32) *uint32 {
 	return &value
 }

cli/compose/types/types.go

@@ -278,7 +278,8 @@ type ServiceVolumeVolume struct {
 	NoCopy bool `mapstructure:"nocopy"`
 }
 
-type fileReferenceConfig struct {
+// FileReferenceConfig for a reference to a swarm file object
+type FileReferenceConfig struct {
 	Source string
 	Target string
 	UID    string
@@ -287,10 +288,10 @@ type fileReferenceConfig struct {
 }
 
 // ServiceConfigObjConfig is the config obj configuration for a service
-type ServiceConfigObjConfig fileReferenceConfig
+type ServiceConfigObjConfig FileReferenceConfig
 
 // ServiceSecretConfig is the secret configuration for a service
-type ServiceSecretConfig fileReferenceConfig
+type ServiceSecretConfig FileReferenceConfig
 
 // UlimitsConfig the ulimit configuration
 type UlimitsConfig struct {