337 lines
8.8 KiB
Go
337 lines
8.8 KiB
Go
package opts
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import (
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"fmt"
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"net"
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"path"
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"regexp"
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"strings"
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units "github.com/docker/go-units"
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)
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var (
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alphaRegexp = regexp.MustCompile(`[a-zA-Z]`)
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domainRegexp = regexp.MustCompile(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`)
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)
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// ListOpts holds a list of values and a validation function.
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type ListOpts struct {
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values *[]string
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validator ValidatorFctType
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}
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// NewListOpts creates a new ListOpts with the specified validator.
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func NewListOpts(validator ValidatorFctType) ListOpts {
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var values []string
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return *NewListOptsRef(&values, validator)
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}
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// NewListOptsRef creates a new ListOpts with the specified values and validator.
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func NewListOptsRef(values *[]string, validator ValidatorFctType) *ListOpts {
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return &ListOpts{
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values: values,
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validator: validator,
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}
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}
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func (opts *ListOpts) String() string {
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if len(*opts.values) == 0 {
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return ""
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}
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return fmt.Sprintf("%v", *opts.values)
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}
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// Set validates if needed the input value and adds it to the
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// internal slice.
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func (opts *ListOpts) Set(value string) error {
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if opts.validator != nil {
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v, err := opts.validator(value)
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if err != nil {
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return err
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}
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value = v
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}
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(*opts.values) = append((*opts.values), value)
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return nil
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}
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// Delete removes the specified element from the slice.
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func (opts *ListOpts) Delete(key string) {
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for i, k := range *opts.values {
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if k == key {
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(*opts.values) = append((*opts.values)[:i], (*opts.values)[i+1:]...)
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return
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}
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}
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}
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// GetMap returns the content of values in a map in order to avoid
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// duplicates.
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func (opts *ListOpts) GetMap() map[string]struct{} {
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ret := make(map[string]struct{})
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for _, k := range *opts.values {
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ret[k] = struct{}{}
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}
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return ret
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}
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// GetAll returns the values of slice.
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func (opts *ListOpts) GetAll() []string {
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return (*opts.values)
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}
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// GetAllOrEmpty returns the values of the slice
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// or an empty slice when there are no values.
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func (opts *ListOpts) GetAllOrEmpty() []string {
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v := *opts.values
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if v == nil {
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return make([]string, 0)
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}
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return v
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}
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// Get checks the existence of the specified key.
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func (opts *ListOpts) Get(key string) bool {
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for _, k := range *opts.values {
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if k == key {
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return true
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}
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}
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return false
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}
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// Len returns the amount of element in the slice.
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func (opts *ListOpts) Len() int {
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return len((*opts.values))
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}
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// Type returns a string name for this Option type
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func (opts *ListOpts) Type() string {
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return "list"
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}
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// WithValidator returns the ListOpts with validator set.
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func (opts *ListOpts) WithValidator(validator ValidatorFctType) *ListOpts {
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opts.validator = validator
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return opts
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}
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// NamedOption is an interface that list and map options
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// with names implement.
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type NamedOption interface {
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Name() string
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}
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// NamedListOpts is a ListOpts with a configuration name.
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// This struct is useful to keep reference to the assigned
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// field name in the internal configuration struct.
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type NamedListOpts struct {
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name string
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ListOpts
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}
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var _ NamedOption = &NamedListOpts{}
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// NewNamedListOptsRef creates a reference to a new NamedListOpts struct.
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func NewNamedListOptsRef(name string, values *[]string, validator ValidatorFctType) *NamedListOpts {
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return &NamedListOpts{
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name: name,
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ListOpts: *NewListOptsRef(values, validator),
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}
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}
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// Name returns the name of the NamedListOpts in the configuration.
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func (o *NamedListOpts) Name() string {
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return o.name
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}
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// MapOpts holds a map of values and a validation function.
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type MapOpts struct {
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values map[string]string
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validator ValidatorFctType
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}
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// Set validates if needed the input value and add it to the
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// internal map, by splitting on '='.
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func (opts *MapOpts) Set(value string) error {
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if opts.validator != nil {
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v, err := opts.validator(value)
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if err != nil {
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return err
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}
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value = v
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}
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vals := strings.SplitN(value, "=", 2)
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if len(vals) == 1 {
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(opts.values)[vals[0]] = ""
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} else {
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(opts.values)[vals[0]] = vals[1]
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}
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return nil
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}
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// GetAll returns the values of MapOpts as a map.
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func (opts *MapOpts) GetAll() map[string]string {
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return opts.values
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}
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func (opts *MapOpts) String() string {
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return fmt.Sprintf("%v", opts.values)
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}
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// Type returns a string name for this Option type
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func (opts *MapOpts) Type() string {
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return "map"
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}
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// NewMapOpts creates a new MapOpts with the specified map of values and a validator.
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func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts {
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if values == nil {
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values = make(map[string]string)
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}
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return &MapOpts{
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values: values,
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validator: validator,
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}
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}
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// NamedMapOpts is a MapOpts struct with a configuration name.
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// This struct is useful to keep reference to the assigned
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// field name in the internal configuration struct.
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type NamedMapOpts struct {
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name string
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MapOpts
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}
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var _ NamedOption = &NamedMapOpts{}
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// NewNamedMapOpts creates a reference to a new NamedMapOpts struct.
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func NewNamedMapOpts(name string, values map[string]string, validator ValidatorFctType) *NamedMapOpts {
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return &NamedMapOpts{
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name: name,
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MapOpts: *NewMapOpts(values, validator),
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}
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}
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// Name returns the name of the NamedMapOpts in the configuration.
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func (o *NamedMapOpts) Name() string {
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return o.name
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}
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// ValidatorFctType defines a validator function that returns a validated string and/or an error.
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type ValidatorFctType func(val string) (string, error)
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// ValidatorFctListType defines a validator function that returns a validated list of string and/or an error
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type ValidatorFctListType func(val string) ([]string, error)
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// ValidateIPAddress validates an Ip address.
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func ValidateIPAddress(val string) (string, error) {
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var ip = net.ParseIP(strings.TrimSpace(val))
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if ip != nil {
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return ip.String(), nil
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}
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return "", fmt.Errorf("%s is not an ip address", val)
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}
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// ValidateDNSSearch validates domain for resolvconf search configuration.
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// A zero length domain is represented by a dot (.).
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func ValidateDNSSearch(val string) (string, error) {
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if val = strings.Trim(val, " "); val == "." {
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return val, nil
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}
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return validateDomain(val)
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}
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func validateDomain(val string) (string, error) {
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if alphaRegexp.FindString(val) == "" {
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return "", fmt.Errorf("%s is not a valid domain", val)
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}
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ns := domainRegexp.FindSubmatch([]byte(val))
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if len(ns) > 0 && len(ns[1]) < 255 {
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return string(ns[1]), nil
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}
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return "", fmt.Errorf("%s is not a valid domain", val)
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}
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// ValidateLabel validates that the specified string is a valid label, and returns it.
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// Labels are in the form on key=value.
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func ValidateLabel(val string) (string, error) {
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if strings.Count(val, "=") < 1 {
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return "", fmt.Errorf("bad attribute format: %s", val)
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}
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return val, nil
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}
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// ValidateSingleGenericResource validates that a single entry in the
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// generic resource list is valid.
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// i.e 'GPU=UID1' is valid however 'GPU:UID1' or 'UID1' isn't
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func ValidateSingleGenericResource(val string) (string, error) {
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if strings.Count(val, "=") < 1 {
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return "", fmt.Errorf("invalid node-generic-resource format `%s` expected `name=value`", val)
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}
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return val, nil
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}
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// ParseLink parses and validates the specified string as a link format (name:alias)
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func ParseLink(val string) (string, string, error) {
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if val == "" {
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return "", "", fmt.Errorf("empty string specified for links")
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}
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arr := strings.Split(val, ":")
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if len(arr) > 2 {
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return "", "", fmt.Errorf("bad format for links: %s", val)
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}
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if len(arr) == 1 {
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return val, val, nil
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}
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// This is kept because we can actually get a HostConfig with links
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// from an already created container and the format is not `foo:bar`
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// but `/foo:/c1/bar`
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if strings.HasPrefix(arr[0], "/") {
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_, alias := path.Split(arr[1])
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return arr[0][1:], alias, nil
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}
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return arr[0], arr[1], nil
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}
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// MemBytes is a type for human readable memory bytes (like 128M, 2g, etc)
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type MemBytes int64
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// String returns the string format of the human readable memory bytes
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func (m *MemBytes) String() string {
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// NOTE: In spf13/pflag/flag.go, "0" is considered as "zero value" while "0 B" is not.
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// We return "0" in case value is 0 here so that the default value is hidden.
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// (Sometimes "default 0 B" is actually misleading)
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if m.Value() != 0 {
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return units.BytesSize(float64(m.Value()))
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}
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return "0"
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}
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// Set sets the value of the MemBytes by passing a string
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func (m *MemBytes) Set(value string) error {
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val, err := units.RAMInBytes(value)
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*m = MemBytes(val)
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return err
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}
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// Type returns the type
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func (m *MemBytes) Type() string {
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return "bytes"
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}
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// Value returns the value in int64
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func (m *MemBytes) Value() int64 {
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return int64(*m)
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}
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// UnmarshalJSON is the customized unmarshaler for MemBytes
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func (m *MemBytes) UnmarshalJSON(s []byte) error {
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if len(s) <= 2 || s[0] != '"' || s[len(s)-1] != '"' {
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return fmt.Errorf("invalid size: %q", s)
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}
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val, err := units.RAMInBytes(string(s[1 : len(s)-1]))
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*m = MemBytes(val)
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return err
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}
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