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wait.go
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wait.go
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package config
import (
"errors"
"fmt"
"strings"
"time"
)
var (
// ErrWaitStringEmpty is the error returned when wait is specified as an empty
// string.
ErrWaitStringEmpty = errors.New("wait: cannot be empty")
// ErrWaitInvalidFormat is the error returned when the wait is specified
// incorrectly.
ErrWaitInvalidFormat = errors.New("wait: invalid format")
// ErrWaitNegative is the error returned with the wait is negative.
ErrWaitNegative = errors.New("wait: cannot be negative")
// ErrWaitMinLTMax is the error returned with the minimum wait time is not
// less than the maximum wait time.
ErrWaitMinLTMax = errors.New("wait: min must be less than max")
)
// WaitConfig is the Min/Max duration used by the Watcher
type WaitConfig struct {
// Enabled determines if this wait is enabled.
Enabled *bool `mapstructure:"bool"`
// Min and Max are the minimum and maximum time, respectively, to wait for
// data changes before rendering a new template to disk.
Min *time.Duration `mapstructure:"min"`
Max *time.Duration `mapstructure:"max"`
}
// DefaultWaitConfig is the default configuration.
func DefaultWaitConfig() *WaitConfig {
return &WaitConfig{}
}
// Copy returns a deep copy of this configuration.
func (c *WaitConfig) Copy() *WaitConfig {
if c == nil {
return nil
}
var o WaitConfig
o.Enabled = c.Enabled
o.Min = c.Min
o.Max = c.Max
return &o
}
// Merge combines all values in this configuration with the values in the other
// configuration, with values in the other configuration taking precedence.
// Maps and slices are merged, most other values are overwritten. Complex
// structs define their own merge functionality.
func (c *WaitConfig) Merge(o *WaitConfig) *WaitConfig {
if c == nil {
if o == nil {
return nil
}
return o.Copy()
}
if o == nil {
return c.Copy()
}
r := c.Copy()
if o.Enabled != nil {
r.Enabled = o.Enabled
}
if o.Min != nil {
r.Min = o.Min
}
if o.Max != nil {
r.Max = o.Max
}
return r
}
// Finalize ensures there no nil pointers.
func (c *WaitConfig) Finalize() {
if c.Enabled == nil {
c.Enabled = Bool(TimeDurationPresent(c.Min))
}
if c.Min == nil {
c.Min = TimeDuration(0 * time.Second)
}
if c.Max == nil {
c.Max = TimeDuration(4 * *c.Min)
}
}
// GoString defines the printable version of this struct.
func (c *WaitConfig) GoString() string {
if c == nil {
return "(*WaitConfig)(nil)"
}
return fmt.Sprintf("&WaitConfig{"+
"Enabled:%s, "+
"Min:%s, "+
"Max:%s"+
"}",
BoolGoString(c.Enabled),
TimeDurationGoString(c.Min),
TimeDurationGoString(c.Max),
)
}
// ParseWaitConfig parses a string of the format `minimum(:maximum)` into a
// WaitConfig.
func ParseWaitConfig(s string) (*WaitConfig, error) {
s = strings.TrimSpace(s)
if len(s) < 1 {
return nil, ErrWaitStringEmpty
}
parts := strings.Split(s, ":")
var min, max time.Duration
var err error
switch len(parts) {
case 1:
min, err = time.ParseDuration(strings.TrimSpace(parts[0]))
if err != nil {
return nil, err
}
max = 4 * min
case 2:
min, err = time.ParseDuration(strings.TrimSpace(parts[0]))
if err != nil {
return nil, err
}
max, err = time.ParseDuration(strings.TrimSpace(parts[1]))
if err != nil {
return nil, err
}
default:
return nil, ErrWaitInvalidFormat
}
if min < 0 || max < 0 {
return nil, ErrWaitNegative
}
if max < min {
return nil, ErrWaitMinLTMax
}
var c WaitConfig
c.Min = TimeDuration(min)
c.Max = TimeDuration(max)
return &c, nil
}
// WaitVar implements the Flag.Value interface and allows the user to specify
// a watch interval using Go's flag parsing library.
type WaitVar WaitConfig
// Set sets the value in the format min[:max] for a wait timer.
func (w *WaitVar) Set(value string) error {
wait, err := ParseWaitConfig(value)
if err != nil {
return err
}
w.Min = wait.Min
w.Max = wait.Max
return nil
}
// String returns the string format for this wait variable
func (w *WaitVar) String() string {
return fmt.Sprintf("%s:%s", w.Min, w.Max)
}