resources

Documentation

Overview

Package resources defines the interface of various abstracted resources used by SafeScale

Package resources ...

Package resources ...

Index

• Constants
• type Bucket
• type Callback
• type Cluster
• type Consistent
• type Feature
• type FeatureSettings
• type Host
• type IndexedListOfClusterNodes
• type Label
• type Metadata
• type Network
• type Results
• type SecurityGroup
• type SecurityGroupActivation
• type SecurityGroupMark
• type Share
• type Subnet
• type Targetable
• type UnitResult
• type UnitResults
• type Volume

Constants

const (
	MarkSecurityGroupAsDefault      = true  // mark the Security Group as a default
	MarkSecurityGroupAsSupplemental = false // mark the Security Group as supplemental
	KeepCurrentSecurityGroupMark    = false // Do not change current Security Group mark
)

Types

type Bucket

type Bucket interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	Browse(ctx context.Context, callback func(bucket *abstract.ObjectStorageBucket) fail.Error) fail.Error
	Create(ctx context.Context, name string) fail.Error
	Delete(ctx context.Context) fail.Error
	Mount(ctx context.Context, hostname string, path string) fail.Error
	ToProtocol(ctx context.Context) (*protocol.BucketResponse, fail.Error)
	Unmount(ctx context.Context, hostname string) fail.Error
}

Bucket GetBucket defines the interface to manipulate Object Storage buckets

type Callback

type Callback = func(data.Clonable, *serialize.JSONProperties) fail.Error

Callback describes the function prototype to use to inspect metadata

type Cluster

type Cluster interface {
	Metadata
	Targetable
	Consistent

	GetName() string
	AddFeature(ctx context.Context, name string, vars data.Map, settings FeatureSettings) (Results, fail.Error)                                               // adds feature on cluster
	AddNodes(ctx context.Context, name string, count uint, def abstract.HostSizingRequirements, parameters data.Map, keepOnFailure bool) ([]Host, fail.Error) // adds several nodes
	Browse(ctx context.Context, callback func(*abstract.ClusterIdentity) fail.Error) fail.Error                                                               // browse in metadata clusters and execute a callback on each entry
	CheckFeature(ctx context.Context, name string, vars data.Map, settings FeatureSettings) (Results, fail.Error)                                             // checks feature on cluster
	Create(ctx context.Context, req abstract.ClusterRequest) fail.Error                                                                                       // creates a new cluster and save its metadata
	DeleteSpecificNode(ctx context.Context, hostID string, selectedMasterID string) fail.Error                                                                // deletes a node identified by its ID
	Delete(ctx context.Context, force bool) fail.Error                                                                                                        // deletes the cluster (Delete is not used to not collision with metadata)
	FindAvailableMaster(ctx context.Context) (Host, fail.Error)                                                                                               // returns ID of the first master available to execute order
	GetIdentity(ctx context.Context) (abstract.ClusterIdentity, fail.Error)                                                                                   // returns Cluster Identity
	GetFlavor(ctx context.Context) (clusterflavor.Enum, fail.Error)                                                                                           // returns the flavor of the cluster
	GetComplexity(ctx context.Context) (clustercomplexity.Enum, fail.Error)                                                                                   // returns the complexity of the cluster
	GetAdminPassword(ctx context.Context) (string, fail.Error)                                                                                                // returns the password of the cluster admin account
	GetKeyPair(ctx context.Context) (*abstract.KeyPair, fail.Error)                                                                                           // returns the key pair used in the cluster
	GetNetworkConfig(ctx context.Context) (*propertiesv3.ClusterNetwork, fail.Error)                                                                          // returns network configuration of the cluster
	GetState(ctx context.Context) (clusterstate.Enum, fail.Error)                                                                                             // returns the current state of the cluster
	IsFeatureInstalled(ctx context.Context, name string) (found bool, ferr fail.Error)                                                                        // tells if a feature is installed in Cluster using only metadata
	ListEligibleFeatures(ctx context.Context) ([]Feature, fail.Error)                                                                                         // returns the list of eligible features for the Cluster
	ListInstalledFeatures(ctx context.Context) ([]Feature, fail.Error)                                                                                        // returns the list of installed features on the Cluster
	ListMasters(ctx context.Context) (IndexedListOfClusterNodes, fail.Error)                                                                                  // lists the node instances corresponding to masters (if there is such masters in the flavor...)
	ListNodes(ctx context.Context) (IndexedListOfClusterNodes, fail.Error)                                                                                    // lists node instances corresponding to the nodes in the cluster
	RemoveFeature(ctx context.Context, name string, vars data.Map, settings FeatureSettings) (Results, fail.Error)                                            // removes feature from cluster
	Shrink(ctx context.Context, name string, count uint) ([]*propertiesv3.ClusterNode, fail.Error)                                                            // reduce the size of the cluster of 'count' nodes (the last created)
	Start(ctx context.Context) fail.Error                                                                                                                     // starts the cluster
	Stop(ctx context.Context) fail.Error                                                                                                                      // stops the cluster
	ToProtocol(ctx context.Context) (*protocol.ClusterResponse, fail.Error)
}

Cluster is the interface of all cluster object instances

type Consistent

type Consistent interface {
	Exists(context.Context) (bool, fail.Error) // Exists checks if the resource actually exists in provider side (not in stow metadata)
}

type Feature

type Feature interface {
	data.Identifiable

	GetName() string
	Add(ctx context.Context, t Targetable, v data.Map, fs FeatureSettings) (Results, fail.Error)    // installs the feature on the target
	Applicable(ctx context.Context, tg Targetable) (bool, fail.Error)                               // tells if the feature is installable on the target
	Check(ctx context.Context, t Targetable, v data.Map, fs FeatureSettings) (Results, fail.Error)  // check if feature is installed on target
	GetDisplayFilename(ctx context.Context) string                                                  // displays the filename of display (optionally adding '[embedded]' for embedded features)
	GetFilename(ctx context.Context) (string, fail.Error)                                           // returns the filename of the feature
	Dependencies(ctx context.Context) (map[string]struct{}, fail.Error)                             // returns the other features needed as requirements
	ListParametersWithControl(ctx context.Context) []string                                         // returns a list of parameter containing version information
	Remove(ctx context.Context, t Targetable, v data.Map, fs FeatureSettings) (Results, fail.Error) // uninstalls the feature from the target
	ToProtocol(ctx context.Context) *protocol.FeatureResponse
}

Feature defines the interface of feature

type FeatureSettings

type FeatureSettings struct {
	SkipProxy               bool // to tell not to try to set reverse proxy
	Serialize               bool // force not to parallel hosts in step
	SkipFeatureRequirements bool // tells not to install required features
	SkipSizingRequirements  bool // tells not to check sizing requirements
	AddUnconditionally      bool // tells to not check before addition (no effect for check or removal)
	IgnoreSuitability       bool // allows to not check if the feature is suitable for the target
	IgnoreTainted           bool
}

FeatureSettings are used to tune the feature

type Host

type Host interface {
	Metadata
	Targetable
	Consistent

	GetName() string
	BindLabel(ctx context.Context, labelInstance Label, value string) fail.Error
	BindSecurityGroup(ctx context.Context, sg SecurityGroup, enable SecurityGroupActivation) fail.Error                                                   // Binds a security group to host
	Browse(ctx context.Context, callback func(*abstract.HostCore) fail.Error) fail.Error                                                                  // ...
	Create(ctx context.Context, hostReq abstract.HostRequest, hostDef abstract.HostSizingRequirements, extra interface{}) (*userdata.Content, fail.Error) // creates a new host and its metadata
	Delete(ctx context.Context) fail.Error
	DisableSecurityGroup(ctx context.Context, sg SecurityGroup) fail.Error                                                 // disables a bound security group on host
	EnableSecurityGroup(ctx context.Context, sg SecurityGroup) fail.Error                                                  // enables a bound security group on host
	ForceGetState(ctx context.Context) (hoststate.Enum, fail.Error)                                                        // returns the real current state of the host, with error handling
	GetAccessIP(ctx context.Context) (string, fail.Error)                                                                  // returns the IP to reach the host, with error handling
	GetDefaultSubnet(ctx context.Context) (Subnet, fail.Error)                                                             // returns the resources.Subnet instance corresponding to the default subnet of the host, with error handling
	GetMounts(ctx context.Context) (*propertiesv1.HostMounts, fail.Error)                                                  // returns the mounts on the host
	GetPrivateIP(ctx context.Context) (string, fail.Error)                                                                 // returns the IP address of the host on the default subnet, with error handling
	GetPrivateIPOnSubnet(ctx context.Context, subnetID string) (string, fail.Error)                                        // returns the IP address of the host on the requested subnet, with error handling
	GetPublicIP(ctx context.Context) (string, fail.Error)                                                                  // returns the public IP address of the host, with error handling
	GetShare(ctx context.Context, shareRef string) (*propertiesv1.HostShare, fail.Error)                                   // returns a clone of the propertiesv1.HostShare corresponding to share 'shareRef'
	GetShares(ctx context.Context) (*propertiesv1.HostShares, fail.Error)                                                  // returns the shares hosted on the host
	GetSSHConfig(ctx context.Context) (sshapi.Config, fail.Error)                                                          // loads SSH configuration for host from metadata
	GetState(ctx context.Context) (hoststate.Enum, fail.Error)                                                             // returns the current state of the host, with error handling
	GetVolumes(ctx context.Context) (*propertiesv1.HostVolumes, fail.Error)                                                // returns the volumes attached to the host
	IsClusterMember(ctx context.Context) (bool, fail.Error)                                                                // returns true if the host is member of a cluster
	IsFeatureInstalled(ctx context.Context, name string) (bool, fail.Error)                                                // tells if a feature is installed on Host, using only metadata
	IsGateway(ctx context.Context) (bool, fail.Error)                                                                      // tells of  the host acts as a gateway
	IsSingle(ctx context.Context) (bool, fail.Error)                                                                       // tells of  the host acts as a gateway
	ListEligibleFeatures(ctx context.Context) ([]Feature, fail.Error)                                                      // returns the list of eligible features for the Cluster
	ListInstalledFeatures(ctx context.Context) ([]Feature, fail.Error)                                                     // returns the list of installed features on the Cluster
	ListSecurityGroups(ctx context.Context, state securitygroupstate.Enum) ([]*propertiesv1.SecurityGroupBond, fail.Error) // returns a slice of properties.SecurityGroupBond corresponding to bound Security Group of the host
	ListLabels(ctx context.Context) (list map[string]string, err fail.Error)
	Pull(ctx context.Context, target, source string, timeout time.Duration) (int, string, string, fail.Error)              // downloads a file from host
	Push(ctx context.Context, source, target, owner, mode string, timeout time.Duration) (int, string, string, fail.Error) // uploads a file to host
	PushStringToFileWithOwnership(ctx context.Context, content string, filename string, owner, mode string) fail.Error     // creates a file 'filename' on remote 'host' with the content 'content' and apply ownership to it
	Reboot(ctx context.Context, soft bool) fail.Error                                                                      // reboots the host
	ResetLabel(ctx context.Context, labelInstance Label) fail.Error
	Run(ctx context.Context, cmd string, outs outputs.Enum, connectionTimeout, executionTimeout time.Duration) (int, string, string, fail.Error) // tries to execute command 'cmd' on the host
	Start(ctx context.Context) fail.Error                                                                                                        // starts the host
	Stop(ctx context.Context) fail.Error                                                                                                         // stops the host
	ToProtocol(ctx context.Context) (*protocol.Host, fail.Error)                                                                                 // converts a host to equivalent gRPC message
	UnbindSecurityGroup(ctx context.Context, sg SecurityGroup) fail.Error                                                                        // Unbinds a security group from host
	UnbindLabel(ctx context.Context, label Label) fail.Error                                                                                     // Untag a host
	UpdateLabel(ctx context.Context, labelInstance Label, value string) fail.Error
	WaitSSHReady(ctx context.Context, timeout time.Duration) (status string, err fail.Error)
}

Host links Object Storage folder and Host

type IndexedListOfClusterNodes

type IndexedListOfClusterNodes map[uint]*propertiesv3.ClusterNode

IndexedListOfClusterNodes ...

type Label

type Label interface {
	Metadata
	data.Identifiable

	GetName() string
	BindToHost(ctx context.Context, hostInstance Host, value string) fail.Error                  // instructs Label to be bound to Host with overrided value (if not a Tag)
	Browse(ctx context.Context, callback func(*abstract.Label) fail.Error) fail.Error            // walks through all the metadata objects in labels
	Create(ctx context.Context, name string, hasDefault bool, defaultValue string) fail.Error    // creates a Label
	Delete(ctx context.Context) fail.Error                                                       // deletes a Label
	IsTag(ctx context.Context) (bool, fail.Error)                                                // tells if the label is a Tag (ie a Label that does not carry a value)
	DefaultValue(ctx context.Context) (string, fail.Error)                                       // returns the default value of the Label
	ToProtocol(ctx context.Context, withHosts bool) (*protocol.LabelInspectResponse, fail.Error) // converts Label to equivalent protocol message
	UnbindFromHost(ctx context.Context, hostInstance Host) fail.Error                            // instructs Label to unbind Host from it
}

Label links Object Storage folder and getTags

type Metadata

type Metadata interface {
	IsNull() bool
	Alter(ctx context.Context, callback Callback) fail.Error                           // protects the data for exclusive write
	BrowseFolder(ctx context.Context, callback func(buf []byte) fail.Error) fail.Error // walks through host folder and executes a callback for each entry
	Deserialize(ctx context.Context, buf []byte) fail.Error                            // Transforms a slice of bytes in struct
	Inspect(ctx context.Context, callback Callback) fail.Error                         // protects the data for shared read with first reloading data from Object Storage
	Read(ctx context.Context, ref string) fail.Error                                   // reads the data from Object Storage using ref as id or name
	ReadByID(ctx context.Context, id string) fail.Error                                // reads the data from Object Storage by id
	Reload(ctx context.Context) fail.Error                                             // Reloads the metadata from the Object Storage, overriding what is in the object
	Sdump(ctx context.Context) (string, fail.Error)
	Service() iaas.Service // Undocumented implicit dependency
}

Metadata contains the core functions of a persistent object

type Network

type Network interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	AbandonSubnet(ctx context.Context, subnetID string) fail.Error                      // used to detach a Subnet from the Network
	AdoptSubnet(ctx context.Context, subnet Subnet) fail.Error                          // used to attach a Subnet to the Network
	Browse(ctx context.Context, callback func(*abstract.Network) fail.Error) fail.Error // call the callback for each entry of the metadata folder of Networks
	Create(ctx context.Context, req abstract.NetworkRequest) fail.Error                 // creates a Network
	Delete(ctx context.Context) fail.Error
	Import(ctx context.Context, ref string) fail.Error
	InspectSubnet(ctx context.Context, subnetRef string) (Subnet, fail.Error) // returns the Subnet instance corresponding to Subnet reference (ID or name) provided (if Subnet is attached to the Network)
	ToProtocol(ctx context.Context) (*protocol.Network, fail.Error)           // converts the network to protobuf message
}

Network links Object Storage folder and Network

type Results

type Results interface {
	Add(string, UnitResults) error
	AddOne(string, string, UnitResult) error
	Successful() bool
	AllErrorMessages() string
	ErrorMessagesOfUnit(name string) (string, fail.Error)
	ErrorMessagesOfKey(name string) string
	ResultsOfKey(key string) UnitResults
	Keys() []string
}

Results ...

type SecurityGroup

type SecurityGroup interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	AddRule(context.Context, *abstract.SecurityGroupRule) fail.Error                                               // returns true if the host is member of a cluster
	AddRules(context.Context, abstract.SecurityGroupRules) fail.Error                                              // returns true if the host is member of a cluster
	BindToHost(context.Context, Host, SecurityGroupActivation, SecurityGroupMark) fail.Error                       // binds a security group to a host
	BindToSubnet(context.Context, Subnet, SecurityGroupActivation, SecurityGroupMark) fail.Error                   // binds a security group to a network
	Browse(ctx context.Context, callback func(*abstract.SecurityGroup) fail.Error) fail.Error                      // browses the metadata folder of Security Groups and call the callback on each entry
	Clear(ctx context.Context) fail.Error                                                                          // removes rules from the security group
	Create(ctx context.Context, networkID, name, description string, rules abstract.SecurityGroupRules) fail.Error // creates a new host and its metadata
	Delete(ctx context.Context, force bool) fail.Error                                                             // deletes the Security Group
	DeleteRule(ctx context.Context, rule *abstract.SecurityGroupRule) fail.Error                                   // deletes a rule from a Security Group
	GetBoundHosts(ctx context.Context) ([]*propertiesv1.SecurityGroupBond, fail.Error)                             // returns a slice of bonds corresponding to hosts bound to the security group
	GetBoundSubnets(ctx context.Context) ([]*propertiesv1.SecurityGroupBond, fail.Error)                           // returns a slice of bonds corresponding to networks bound to the security group
	Reset(ctx context.Context) fail.Error                                                                          // resets the rules of the security group from the ones registered in metadata
	ToProtocol(ctx context.Context) (*protocol.SecurityGroupResponse, fail.Error)                                  // converts a SecurityGroup to equivalent gRPC message
	UnbindFromHost(context.Context, Host) fail.Error                                                               // unbinds a Security Group from Host
	UnbindFromHostByReference(context.Context, string) fail.Error                                                  // unbinds a Security Group from Host
	UnbindFromSubnet(context.Context, Subnet) fail.Error                                                           // unbinds a Security Group from Subnet
	UnbindFromSubnetByReference(context.Context, string) fail.Error                                                // unbinds a Security group from a Subnet identified by reference (ID or name)
}

SecurityGroup links Object Storage folder and SecurityGroup

type SecurityGroupActivation

type SecurityGroupActivation bool

SecurityGroupActivation represents activation state of a Security Group

const (
	// SecurityGroupEnable means the security group is enabled
	SecurityGroupEnable SecurityGroupActivation = true
	// SecurityGroupDisable means the security group is disabled
	SecurityGroupDisable SecurityGroupActivation = false
)

type SecurityGroupMark

type SecurityGroupMark bool

type Share

type Share interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	Browse(ctx context.Context, callback func(hostName string, shareID string) fail.Error) fail.Error
	Create(ctx context.Context, shareName string, host Host, path string, options string) fail.Error // creates a share on host
	Delete(ctx context.Context) fail.Error
	GetServer(ctx context.Context) (Host, fail.Error)                                                              // returns the *Host acting as share server, with error handling
	Mount(ctx context.Context, host Host, path string, withCache bool) (*propertiesv1.HostRemoteMount, fail.Error) // mounts a share on a local directory of a host
	Unmount(ctx context.Context, host Host) fail.Error                                                             // unmounts a share from local directory of a host
	ToProtocol(ctx context.Context) (*protocol.ShareMountList, fail.Error)
}

Share contains information to maintain in Object Storage a list of shared folders

type Subnet

type Subnet interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	DetachHost(ctx context.Context, hostID string) fail.Error                                                                                       // unlinks host ID from subnet
	AttachHost(context.Context, Host) fail.Error                                                                                                    // links Host to the Subnet
	BindSecurityGroup(context.Context, SecurityGroup, SecurityGroupActivation) fail.Error                                                           // binds a Security Group to the Subnet
	Browse(ctx context.Context, callback func(*abstract.Subnet) fail.Error) fail.Error                                                              // ...
	Create(ctx context.Context, req abstract.SubnetRequest, gwname string, gwSizing *abstract.HostSizingRequirements, extra interface{}) fail.Error // creates a Subnet
	Delete(ctx context.Context) fail.Error                                                                                                          // deletes a Subnet
	DisableSecurityGroup(context.Context, SecurityGroup) fail.Error                                                                                 // disables a bound Security Group on Subnet
	EnableSecurityGroup(context.Context, SecurityGroup) fail.Error                                                                                  // enables a bound Security Group on Subnet
	GetGatewayPublicIP(ctx context.Context, primary bool) (string, fail.Error)                                                                      // returns the gateway related to Subnet
	GetGatewayPublicIPs(ctx context.Context) ([]string, fail.Error)                                                                                 // returns the gateway IPs of the Subnet
	GetDefaultRouteIP(ctx context.Context) (string, fail.Error)                                                                                     // returns the private IP of the default route of the Subnet
	GetEndpointIP(ctx context.Context) (string, fail.Error)                                                                                         // returns the public IP to reach the Subnet from Internet
	GetCIDR(ctx context.Context) (string, fail.Error)                                                                                               // return the CIDR
	GetState(ctx context.Context) (subnetstate.Enum, fail.Error)                                                                                    // gives the current state of the Subnet
	HasVirtualIP(ctx context.Context) (bool, fail.Error)                                                                                            // tells if the Subnet is using a VIP as default route
	InspectGateway(ctx context.Context, primary bool) (Host, fail.Error)                                                                            // returns the gateway related to Subnet
	InspectGatewaySecurityGroup(ctx context.Context) (SecurityGroup, fail.Error)                                                                    // returns the SecurityGroup responsible of network security on Gateway
	InspectInternalSecurityGroup(ctx context.Context) (SecurityGroup, fail.Error)                                                                   // returns the SecurityGroup responsible of internal network security
	InspectPublicIPSecurityGroup(ctx context.Context) (SecurityGroup, fail.Error)                                                                   // returns the SecurityGroup responsible of Hosts with Public IP (excluding gateways)
	InspectNetwork(ctx context.Context) (Network, fail.Error)                                                                                       // returns the instance of the parent Network of the Subnet
	ListHosts(ctx context.Context) ([]Host, fail.Error)                                                                                             // returns the list of Host attached to the subnet (excluding gateway)
	ListSecurityGroups(ctx context.Context, state securitygroupstate.Enum) ([]*propertiesv1.SecurityGroupBond, fail.Error)                          // lists the security groups bound to the subnet
	ToProtocol(ctx context.Context) (*protocol.Subnet, fail.Error)                                                                                  // converts the subnet to protobuf message
	UnbindSecurityGroup(context.Context, SecurityGroup) fail.Error                                                                                  // unbinds a security group from the subnet
}

Subnet links Object Storage folder and Network

type Targetable

type Targetable interface {
	data.Identifiable

	GetName() string
	ComplementFeatureParameters(ctx context.Context, v data.Map) fail.Error                                // adds parameters corresponding to the Target in preparation of feature installation
	UnregisterFeature(ctx context.Context, feat string) fail.Error                                         // unregisters a Feature from Target in metadata
	InstalledFeatures(ctx context.Context) ([]string, fail.Error)                                          // returns a list of installed features
	InstallMethods(ctx context.Context) (map[uint8]installmethod.Enum, fail.Error)                         // returns a list of installation methods usable on the target, ordered from upper to lower preference (1 = the highest preference)
	RegisterFeature(ctx context.Context, feat Feature, requiredBy Feature, clusterContext bool) fail.Error // registers a feature on target in metadata
	Service() iaas.Service                                                                                 // returns the iaas.Service used by the target
	TargetType() featuretargettype.Enum                                                                    // returns the type of the target
}

Targetable is an interface that target must satisfy to be able to install something on it

type UnitResult

type UnitResult interface {
	Successful() bool
	Completed() bool
	Error() error
	ErrorMessage() string
}

UnitResult ...

type UnitResults

type UnitResults interface {
	AddOne(string, UnitResult)
	Completed() bool
	Uncompleted() []string
	ErrorMessages() string
	Successful() bool
	Keys() []string
	ResultOfKey(key string) UnitResult
}

UnitResults ...

type Volume

type Volume interface {
	Metadata
	data.Identifiable
	Consistent

	GetName() string
	Attach(ctx context.Context, host Host, path, format string, doNotFormat, doNotMount bool) fail.Error // attaches a volume to a host
	Browse(ctx context.Context, callback func(*abstract.Volume) fail.Error) fail.Error                   // walks through all the metadata objects in network
	Create(ctx context.Context, req abstract.VolumeRequest) fail.Error                                   // creates a volume
	Delete(ctx context.Context) fail.Error                                                               // deletes a volume
	Detach(ctx context.Context, host Host) fail.Error                                                    // detaches the volume identified by ref, ref can be the name or the id
	GetAttachments(ctx context.Context) (*propertiesv1.VolumeAttachments, fail.Error)                    // returns the property containing where the volume is attached
	GetSize(ctx context.Context) (int, fail.Error)                                                       // returns the size of volume in GB
	GetSpeed(ctx context.Context) (volumespeed.Enum, fail.Error)                                         // returns the speed of the volume (more or less the type of hardware)
	ToProtocol(ctx context.Context) (*protocol.VolumeInspectResponse, fail.Error)                        // converts volume to equivalent protocol message
}

Volume links Object Storage folder and getVolumes