flags

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 Go to latest Published: Jun 21, 2021 License: BSD-3-Clause Imports: 13 Imported by: 18

Documentation

Overview

Package flags implements utilities to augment the standard Go flag package. It defines commonly used Vanadium flags, and implementations of the flag.Value interface for those flags to ensure that only valid values of those flags are supplied. Some of these flags may also be specified using environment variables directly and are documented accordingly; in these cases the command line value takes precedence over the environment variable.

Flags are defined as 'groups' of related flags so that the caller may choose which ones to use without having to be burdened with the full set. The groups may be used directly or via the Flags type that aggregates multiple groups. In all cases, the flags are registered with a supplied flag.FlagSet and hence are not forced onto the command line unless the caller passes in flag.CommandLine as the flag.FlagSet to use.

In general, this package will be used by vanadium profiles and the runtime implementations, but can also be used by any application that wants access to the flags and environment variables it supports.

Default values are provided for all flags that can be overridden either by calling functions in this package, or globally, by providing an alternative implementation of the ./flags/sitedefaults package. sitedefaults is sub-module that can be overridden using a 'replace' statement in go.mod to provide site specific defaults.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DefaultCredentialsDir 

func DefaultCredentialsDir() string

DefaultCredentialsDir returns the current default for --v23.credentials taking V23_CREDENTIALS into account

func DefaultCredentialsDirNoEnv 

func DefaultCredentialsDirNoEnv() string

DefaultCredentialsDirNoEnv returns the current default for --v23.credentials ignoring V23_CREDENTIALS

func DefaultHostPort 

func DefaultHostPort() string

DefaultHostPort returns the current default host port.

func DefaultNamespaceRoots 

func DefaultNamespaceRoots() []string

DefaultNamespaceRoots returns the current default value of -v23.namespace.root taking the environment variables V23_NAMESPACE_ROOT0... into account.

func DefaultNamespaceRootsNoEnv 

func DefaultNamespaceRootsNoEnv() []string

DefaultNamespaceRootsNoEnv returns the current default value of -v23.namespace.root ignoring V23_NAMESPACE_ROOT0...

func DefaultPermissions 

func DefaultPermissions() map[string]string

DefaultPermissions returns the current default values for --v23.permissions.file as a map.

func DefaultPermissionsLiteral 

func DefaultPermissionsLiteral() string

DefaultPermissionsLiteral returns the current default value for --v23.permissions.literal.

func DefaultProtocol 

func DefaultProtocol() string

DefaultProtocol returns the current default protocol.

func DefaultProxy 

func DefaultProxy() string

DefaultProxy returns the current default proxy.

func DefaultProxyLimit added in v0.1.10 

func DefaultProxyLimit() int

DefaultProxyLimit returns the current default proxy limit.

func DefaultProxyPolicy added in v0.1.10 

func DefaultProxyPolicy() rpc.ProxyPolicy

DefaultProxyPolicy returns the current default proxy policy.

func RegisterListenFlags 

func RegisterListenFlags(fs *flag.FlagSet, f *ListenFlags) error

RegisterListenFlags registers the supplied ListenFlags variable with the supplied FlagSet.

func RegisterPermissionsFlags 

func RegisterPermissionsFlags(fs *flag.FlagSet, f *PermissionsFlags) error

RegisterPermissionsFlags registers the supplied PermissionsFlags with the supplied FlagSet.

func RegisterRuntimeFlags 

func RegisterRuntimeFlags(fs *flag.FlagSet, f *RuntimeFlags) error

RegisterRuntimeFlags registers the supplied RuntimeFlags variable with the supplied FlagSet.

func RegisterVirtualizedFlags added in v0.1.10 

func RegisterVirtualizedFlags(fs *flag.FlagSet, f *VirtualizedFlags) error

RegisterVirtualizedFlags registers the supplied VirtualizedFlags variable with the supplied FlagSet.

func SetDefaultCredentialsDir 

func SetDefaultCredentialsDir(credentialsDir string)

SetDefaultCredentialsDir sets the default value for --v23.credentials. It must be called before flags are parsed for it to take effect.

func SetDefaultHostPort 

func SetDefaultHostPort(s string)

SetDefaultHostPort sets the default host and port used when --v23.tcp.address is not provided. It must be called before flags are parsed for it to take effect.

func SetDefaultNamespaceRoots 

func SetDefaultNamespaceRoots(roots ...string)

SetDefaultNamespaceRoots sets the default value for --v23.namespace.root

func SetDefaultPermissions 

func SetDefaultPermissions(name, file string)

SetDefaultPermissions adds a name, file pair to the default value for --v23.permissions.file.

func SetDefaultPermissionsLiteral 

func SetDefaultPermissionsLiteral(literal string)

SetDefaultPermissionsLiteral sets the default value for --v23.permissions.literal.

func SetDefaultProtocol 

func SetDefaultProtocol(protocol string)

SetDefaultProtocol sets the default protocol used when --v23.tcp.protocol is not provided. It must be called before flags are parsed for it to take effect.

func SetDefaultProxy 

func SetDefaultProxy(s string)

SetDefaultProxy sets the default proxy used when --v23.proxy is not provided. It must be called before flags are parsed for it to take effect.

func SetDefaultProxyLimit added in v0.1.10 

func SetDefaultProxyLimit(l int)

SetDefaultProxyLimit sets the default proxy used when --v23.proxy.limit is not provided. It must be called before flags are parsed for it to take effect.

func SetDefaultProxyPolicy added in v0.1.10 

func SetDefaultProxyPolicy(p rpc.ProxyPolicy)

SetDefaultProxyPolicy sets the default proxy used when --v23.proxy.policy is not provided. It must be called before flags are parsed for it to take effect.

func SetDefaultVirtualizedFlagValues added in v0.1.10 

func SetDefaultVirtualizedFlagValues(values VirtualizedFlagDefaults)

SetDefaultVirtualizedFlagValues sets the default values to use for the Virtualized flags group.

func SetDefaultVtraceFlags added in v0.1.17 

func SetDefaultVtraceFlags(values VtraceFlags)

Types

type FlagGroup 

type FlagGroup int

FlagGroup is the type for identifying groups of related flags. 

const (
	// Runtime identifies the flags and associated environment variables
	// used by the Vanadium process runtime. Namely:
	// --v23.namespace.root (which may be repeated to supply multiple values)
	// --v23.credentials
	// --v23.vtrace.sample-rate
	// --v23.vtrace.dump-on-shutdown
	// --v23.vtrace.cache-size
	// --v23.vtrace.collect-regexp
	// --v23.vtrace.enable-aws-xray
	// --v23.vtrace.root-span-name
	Runtime FlagGroup = iota
	// Listen identifies the flags typically required to configure
	// rpc.ListenSpec. Namely:
	// --v23.tcp.protocol
	// --v23.tcp.address
	// --v23.proxy
	// --v23.proxy.policy
	// --v23.proxy.limit
	Listen
	// Permissions identifies the flags typically required to configure
	// authorization.
	// --v23.permissions.file (which may be repeated to supply multiple values)
	// Permissions files are named - i.e. --v23.permissions.file=<name>:<file>
	// with the name "runtime" reserved for use by the runtime. "file" is
	// a JSON-encoded representation of the Permissions type defined in the
	// VDL package v.io/v23/security/access
	// --v23.permissions.literal (which may be repeated to supply multiple values
	// which will be concatenated)
	// This flag allows permissions to specified directly on the command line.
	Permissions
	// Virtualized identifies the flags typically required to configure a server
	// running in some form of virtualized or isolated environment such
	// as AWS, GCE or within a docker container.
	// v23.virtualized.docker
	// v23.virtualized.provider
	// v23.virtualized.discover-public-address
	// v23.virtualized.tcp.public-protocol
	// v23.virtualized.tcp.public-address
	// v23.virtualized.dns.public-name
	Virtualized
)

type Flags 

type Flags struct {
	FlagSet *flag.FlagSet
	// contains filtered or unexported fields
}

Flags represents the set of flag groups created by a call to CreateAndRegister.

func CreateAndRegister 

func CreateAndRegister(fs *flag.FlagSet, groups ...FlagGroup) (*Flags, error)

CreateAndRegister creates a new set of flag groups as specified by the supplied flag group parameters and registers them with the supplied flag.FlagSet.

func (*Flags) Args 

func (f *Flags) Args() []string

Args returns the unparsed args, as per flag.Args.

func (*Flags) HasGroup 

func (f *Flags) HasGroup(group FlagGroup) bool

HasGroup returns group if the supplied FlagGroup has been created for these Flags.

func (*Flags) ListenFlags 

func (f *Flags) ListenFlags() ListenFlags

ListenFlags returns a copy of the Listen flag group stored in Flags. This copy will contain default values if the Listen flag group was not specified when CreateAndRegister was called. The HasGroup method can be used for testing to see if any given group was configured.

func (*Flags) Parse 

func (f *Flags) Parse(args []string, cfg map[string]string) error

Parse parses the supplied args, as per flag.Parse. The config can optionally specify flag overrides. Any default values modified since the last call to Parse will used.

func (*Flags) PermissionsFlags 

func (f *Flags) PermissionsFlags() PermissionsFlags

PermissionsFlags returns a copy of the Permissions flag group stored in Flags. This copy will contain default values if the Permissions flag group was not specified when CreateAndRegister was called. The HasGroup method can be used for testing to see if any given group was configured.

func (*Flags) RuntimeFlags 

func (f *Flags) RuntimeFlags() RuntimeFlags

RuntimeFlags returns the Runtime flag subset stored in its Flags instance.

func (*Flags) VirtualizedFlags added in v0.1.10 

func (f *Flags) VirtualizedFlags() VirtualizedFlags

VirtualizedFlags returns a copy of the Virtualized flag group stored in Flags. This copy will contain default values if the Virtualized flag group was not specified when CreateAndRegister was called. The HasGroup method can be used for testing to see if any given group was configured.

type HostPortFlag added in v0.1.10 

type HostPortFlag struct {
	Host string
	Port string
}

HostPortFlag implements flag.Value to provide validation of the command line value it is set to. The allowed format is <host>:<port>. The host may be specified as a hostname or as an IP address (v4 or v6). A DNS hostname is never resolved.

func (HostPortFlag) Get added in v0.1.10 

func (ip HostPortFlag) Get() interface{}

Get implements flag.Getter.

func (*HostPortFlag) Set added in v0.1.10 

func (ip *HostPortFlag) Set(s string) error

Set implements flag.Value.

func (HostPortFlag) String added in v0.1.10 

func (ip HostPortFlag) String() string

Implements flag.Value.String

type IPFlag 

type IPFlag struct{ net.IP }

IPFlag implements flag.Value in order to provide validation of IP addresses in the flag package.

func (IPFlag) Get 

func (ip IPFlag) Get() interface{}

Get implements flag.Getter.

func (*IPFlag) Set 

func (ip *IPFlag) Set(s string) error

Set implements flag.Value.

func (IPFlag) String 

func (ip IPFlag) String() string

Implements flag.Value.String

type IPHostPortFlag 

type IPHostPortFlag struct {
	Address string
	Host    string
	IP      []*net.IPAddr
	Port    string
}

IPHostPortFlag implements flag.Value to provide validation of the command line value it is set to. The allowed format is <host>:<port> in ip4 and ip6 formats. The host may be specified as a hostname or as an IP address (v4 or v6). If a hostname is used and it resolves to multiple IP addresses then all of those addresses are stored in IPHostPort.

func (IPHostPortFlag) Get 

func (ip IPHostPortFlag) Get() interface{}

Get implements flag.Getter.

func (*IPHostPortFlag) Set 

func (ip *IPHostPortFlag) Set(s string) error

Set implements flag.Value.

func (IPHostPortFlag) String 

func (ip IPHostPortFlag) String() string

Implements flag.Value.String

type ListenAddrs 

type ListenAddrs []struct {
	Protocol, Address string
}

ListenAddrs is the set of listen addresses captured from the command line. ListenAddrs mirrors rpc.ListenAddrs.

type ListenFlags 

type ListenFlags struct {
	Addrs       ListenAddrs
	Proxy       string             `cmdline:"v23.proxy,,object name of proxy service to use to export services across network boundaries"`
	ProxyPolicy ProxyPolicyFlag    `cmdline:"v23.proxy.policy,,policy for choosing from a set of available proxy instances"`
	ProxyLimit  int                `` /* 132-byte string literal not displayed */
	Protocol    tcpProtocolFlagVar `cmdline:"v23.tcp.protocol,,protocol to listen with"`
	Addresses   ipHostPortFlagVar  `cmdline:"v23.tcp.address,,address to listen on"`
}

ListenFlags contains the values of the Listen flag group.

func CreateAndRegisterListenFlags 

func CreateAndRegisterListenFlags(fs *flag.FlagSet) (*ListenFlags, error)

CreateAndRegisterListenFlags creates and registers the ListenFlags group with the supplied flag.FlagSet.

func NewListenFlags 

func NewListenFlags() (*ListenFlags, error)

NewListenFlags creates a new ListenFlags with appropriate defaults.

type NamespaceRootFlag 

type NamespaceRootFlag struct {
	Roots []string
	// contains filtered or unexported fields
}

NamespaceRootFlag represents a flag.Value for --v23.namespace.root.

func (*NamespaceRootFlag) Set 

func (nsr *NamespaceRootFlag) Set(v string) error

Set implements flag.Value

func (*NamespaceRootFlag) String 

func (nsr *NamespaceRootFlag) String() string

String implements flag.Value.

type PermissionsFlag 

type PermissionsFlag struct {
	// contains filtered or unexported fields
}

PermissionsFlag represents a flag.Value for --v23.permissions.file

func (*PermissionsFlag) Set 

func (permsf *PermissionsFlag) Set(v string) error

Set implements flag.Value.

func (*PermissionsFlag) String 

func (permsf *PermissionsFlag) String() string

String implements flag.Value.

type PermissionsFlags 

type PermissionsFlags struct {
	// List of named Permissions files.
	Files PermissionsFlag `cmdline:"v23.permissions.file,,specify a perms file as <name>:<permsfile>"`

	// Literal permissions, override everything else.
	Literal PermissionsLiteralFlag `` /* 152-byte string literal not displayed */
}

PermissionsFlags contains the values of the PermissionsFlags flag group.

func CreateAndRegisterPermissionsFlags 

func CreateAndRegisterPermissionsFlags(fs *flag.FlagSet) (*PermissionsFlags, error)

CreateAndRegisterPermissionsFlags creates and registers a PermissionsFlags with the supplied FlagSet.

func NewPermissionsFlags 

func NewPermissionsFlags() (*PermissionsFlags, error)

NewPermissionsFlags creates a PermissionsFlags with appropriate defaults.

func (PermissionsFlags) AddPermissionsFile 

func (af PermissionsFlags) AddPermissionsFile(arg string) error

AddPermissionsFile adds a permissions file, which must be in the same format as accepted by --v23.permissions.file

func (PermissionsFlags) AddPermissionsLiteral 

func (af PermissionsFlags) AddPermissionsLiteral(arg string) error

AddPermissionsLiteral adds another literal permissions statement.

func (PermissionsFlags) ExplicitlySpecified added in v0.1.2 

func (af PermissionsFlags) ExplicitlySpecified() bool

ExplicitlySpecified returns true if either of the permissions flags was explicitly set on the command line.

func (PermissionsFlags) PermissionsFile 

func (af PermissionsFlags) PermissionsFile(name string) string

PermissionsFile returns the file which is presumed to contain Permissions information associated with the supplied name parameter.

func (PermissionsFlags) PermissionsLiteral 

func (af PermissionsFlags) PermissionsLiteral() string

PermissionsLiteral returns the in-line literal permissions provided on the command line.

func (PermissionsFlags) PermissionsNamesAndFiles 

func (af PermissionsFlags) PermissionsNamesAndFiles() map[string]string

PermissionsNamesAndFiles returns the set of permission names and associated files specified using --v23.permissions.file.

type PermissionsLiteralFlag 

type PermissionsLiteralFlag struct {
	// contains filtered or unexported fields
}

PermissionsLiteralFlag represents a flag.Value for --v23.permissions.literal

func (*PermissionsLiteralFlag) Set 

func (permsl *PermissionsLiteralFlag) Set(v string) error

Set implements flag.Value.

func (*PermissionsLiteralFlag) String 

func (permsl *PermissionsLiteralFlag) String() string

String implements flag.Value.

type ProxyPolicyFlag added in v0.1.10 

type ProxyPolicyFlag rpc.ProxyPolicy

func (ProxyPolicyFlag) Get added in v0.1.10 

func (policy ProxyPolicyFlag) Get() interface{}

func (*ProxyPolicyFlag) Set added in v0.1.10 

func (policy *ProxyPolicyFlag) Set(s string) error

func (ProxyPolicyFlag) String added in v0.1.10 

func (policy ProxyPolicyFlag) String() string

func (ProxyPolicyFlag) Value added in v0.1.10 

func (policy ProxyPolicyFlag) Value() rpc.ProxyPolicy

type RuntimeFlags 

type RuntimeFlags struct {
	// NamespaceRoots may be initialized by ref.EnvNamespacePrefix* enivornment
	// variables as well as --v23.namespace.root. The command line
	// will override the environment.
	NamespaceRoots NamespaceRootFlag `cmdline:"v23.namespace.root,,local namespace root; can be repeated to provided multiple roots"`

	// Credentials may be initialized by the ref.EnvCredentials
	// environment variable. The command line will override the environment.
	// TODO(cnicolaou): provide flag.Value impl
	Credentials string `cmdline:"v23.credentials,,directory to use for storing security credentials"`

	// VtraceFlags control various aspects of Vtrace.
	VtraceFlags
}

RuntimeFlags contains the values of the Runtime flag group.

func CreateAndRegisterRuntimeFlags 

func CreateAndRegisterRuntimeFlags(fs *flag.FlagSet) (*RuntimeFlags, error)

CreateAndRegisterRuntimeFlags creates and registers a RuntimeFlags with the supplied flag.FlagSet.

func NewRuntimeFlags 

func NewRuntimeFlags() (*RuntimeFlags, error)

NewRuntimeFlags creates a new RuntimeFlags with appropriate defaults.

type TCPProtocolFlag 

type TCPProtocolFlag struct {
	Protocol string
}

TCPProtocolFlag implements flag.Value to provide validation of the command line values passed to it: tcp, tcp4, tcp6, ws, ws4, ws6, wsh, wsh4, and wsh6 being the only allowed values.

func (TCPProtocolFlag) Get 

func (t TCPProtocolFlag) Get() interface{}

Get implements flag.Getter.

func (*TCPProtocolFlag) Set 

func (t *TCPProtocolFlag) Set(s string) error

Set implements flag.Value.

func (TCPProtocolFlag) String 

func (t TCPProtocolFlag) String() string

String implements flag.Value.

type VirtualizationProvider added in v0.1.10 

type VirtualizationProvider string

VirtualizationProvider identifies a particular virtualization provider/cloud computing vendor. Popular providers are defined here, but applications may chose to add define and act on others by creating additional runtime factories. 

const (
	// Native is reserved for any/all non-virtualized environments.
	Native VirtualizationProvider = ""
	// AWS is reserved for Amazon Web Services.
	AWS VirtualizationProvider = "AWS"
	// GCP is reserved for Google's Compute Platform.
	GCP VirtualizationProvider = "GCP"
)

type VirtualizationProviderFlag added in v0.1.10 

type VirtualizationProviderFlag struct {
	Provider VirtualizationProvider
}

VirtualizationProviderFlag represents

func (VirtualizationProviderFlag) Get added in v0.1.10 

func (vp VirtualizationProviderFlag) Get() interface{}

Get implements flat.Getter.

func (*VirtualizationProviderFlag) Set added in v0.1.10 

func (vp *VirtualizationProviderFlag) Set(v string) error

Set implements flat.Value.

func (*VirtualizationProviderFlag) String added in v0.1.10 

func (vp *VirtualizationProviderFlag) String() string

String implements flat.Value.

type VirtualizedFlagDefaults added in v0.1.10 

type VirtualizedFlagDefaults struct {
	Dockerized                bool
	VirtualizationProvider    string
	PublicProtocol            string
	PublicAddress             string
	PublicDNSName             string
	AdvertisePrivateAddresses bool
}

VirtualizedFlagDefaults is used to set defaults for the Virtualized flag group.

func DefaultVirtualizedFlagValues added in v0.1.10 

func DefaultVirtualizedFlagValues() VirtualizedFlagDefaults

DefaultVirtualizedFlagValues returns the default values to use for the Virtualized flags group taking V23_VIRTUALIZATION_PROVIDER into account. In addition, if V23_EXPECT_GOOGLE_COMPUTE_ENGINE is set then GCP is assumed to be the virtualization provider. V23_EXPECT_GOOGLE_COMPUTE_ENGINE will be removed in the near future (as of 7/30/20). V23_VIRTUALIZATION_PROVIDER will override the effect of V23_EXPECT_GOOGLE_COMPUTE_ENGINE.

type VirtualizedFlags added in v0.1.10 

type VirtualizedFlags struct {
	Dockerized                bool                       `` /* 135-byte string literal not displayed */
	VirtualizationProvider    VirtualizationProviderFlag `` /* 163-byte string literal not displayed */
	DissallowNativeFallback   bool                       `` /* 175-byte string literal not displayed */
	PublicProtocol            TCPProtocolFlag            `cmdline:"v23.virtualized.tcp.public-protocol,,if set the process will use this protocol for its entry in the mounttable"`
	PublicAddress             IPHostPortFlag             `` /* 153-byte string literal not displayed */
	PublicDNSName             HostPortFlag               `` /* 154-byte string literal not displayed */
	AdvertisePrivateAddresses bool                       `cmdline:"v23.virtualized.advertise-private-addresses,,if set the process will also advertise its private addresses"`
}

VirtualizedFlags contains the values of the Virtualized flag group.

func CreateAndRegisterVirtualizedFlags added in v0.1.10 

func CreateAndRegisterVirtualizedFlags(fs *flag.FlagSet) (*VirtualizedFlags, error)

CreateAndRegisterVirtualizedFlags creates and registers the VirtualizedFlags group with the supplied flag.FlagSet.

func NewVirtualizedFlags added in v0.1.10 

func NewVirtualizedFlags() (*VirtualizedFlags, error)

NewVirtualizedFlags creates a new VirtualizedFlags with appropriate defaults.

type VtraceFlags 

type VtraceFlags struct {
	// VtraceSampleRate is the rate (from 0.0 - 1.0) at which
	// vtrace traces started by this process are sampled for collection.
	SampleRate float64 `cmdline:"v23.vtrace.sample-rate,,Rate (from 0.0 to 1.0) to sample vtrace traces"`

	// VtraceDumpOnShutdown tells the runtime to dump all stored traces
	// to Stderr at shutdown if true.
	DumpOnShutdown bool `cmdline:"v23.vtrace.dump-on-shutdown,true,'If true, dump all stored traces on runtime shutdown'"`

	// VtraceCacheSize is the number of traces to cache in memory.
	// TODO(mattr): Traces can be of widely varying size, we should have
	// some better measurement then just number of traces.
	CacheSize int `cmdline:"v23.vtrace.cache-size,1024,The number of vtrace traces to store in memory"`

	// LogLevel is the level of vlogs that should be collected as part of
	// the trace
	LogLevel int `cmdline:"v23.vtrace.v,,The verbosity level of the log messages to be captured in traces"`

	// SpanRegexp matches a regular expression against span names and
	// annotations and forces any trace matching trace to be collected.
	CollectRegexp string `cmdline:"v23.vtrace.collect-regexp,,Spans and annotations that match this regular expression will trigger trace collection"`

	EnableAWSXRay bool `cmdline:"v23.vtrace.enable-aws-xray,false,Enable the use of AWS x-ray integration with vtrace"`

	RootSpanName string `cmdline:"v23.vtrace.root-span-name,,Set the name of the root vtrace span created by the runtime at startup"`
}

VtraceFlags represents the flags used to configure rpc tracing.

func DefaultVtraceFlags added in v0.1.17 

func DefaultVtraceFlags() VtraceFlags

Source Files

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sitedefaults module

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