helper

Documentation

Index

• Constants
• func CastInt64ToUint(in *int64) (uint, error)
• func CastToStringMapSlice(iface interface{}) []map[string]string
• func CastToStringMapSliceE(iface interface{}) ([]map[string]string, error)
• func Hash(s string) uint32
• func IncUint(value uint, by int) uint
• func Must(v interface{}, err error) interface{}
• func SubUint(a uint, by uint) int
• func SubUint2(a uint, by uint) uint
• type LatestGradient
  • func (lg *LatestGradient) Get(value float32, timestamp time.Time) float32
  • func (lg *LatestGradient) Update(value float32, timestamp time.Time)
  • func (lg *LatestGradient) UpdateAndGet(value float32, timestamp time.Time) float32
• type SimpleTime
  • func NewTime(hour, minute uint) (SimpleTime, error)
  • func NewTimeFromMinute(minutes uint) (SimpleTime, error)
  • func (s SimpleTime) Minutes() uint
  • func (s SimpleTime) String() string

Constants

const (
	MaxUint = ^uint(0)
	MinUint = 0
	MaxInt  = int(MaxUint >> 1)
	MinInt  = -MaxInt - 1
)

Functions

func CastInt64ToUint

func CastInt64ToUint(in *int64) (uint, error)

CastInt64ToUint safely casts the given int64 pointer value to uint value. If the input is nil then an error will be returned. If the input is < 0 then 0 is returned.

func CastToStringMapSlice

func CastToStringMapSlice(iface interface{}) []map[string]string

CastToStringMapSlice casts the given input to a slice of string:string map's

func CastToStringMapSliceE

func CastToStringMapSliceE(iface interface{}) ([]map[string]string, error)

CastToStringMapSliceE casts the given input to a slice of string:string map's

func Hash

func Hash(s string) uint32

Hash creates a 32-bit FNV-1a hash out of the given string.

func IncUint

func IncUint(value uint, by int) uint

IncUint increments the given value (unsigned) by the given amount (signed) and returns the result as unsigned int (safe from under-/overflow)

func Must

func Must(v interface{}, err error) interface{}

Must is a helper that checks if a error returned by a function is nil in this case Must will end the program with a fatal printing out the error. If the error is nil the result of the function will be returned.

func SubUint

func SubUint(a uint, by uint) int

SubUint substracts two uint's and returns the signed difference Avoids over-/underflow.

func SubUint2

func SubUint2(a uint, by uint) uint

SubUint2 substracts two uint's and returns the unsigned difference Avoids over-/underflow.

Types

type LatestGradient

type LatestGradient struct {
	Value     float32
	Timestamp time.Time
	// contains filtered or unexported fields
}

LatestGradient is a structure that can be used to calculate the gradient of the two latest values of a field.

func (*LatestGradient) Get

func (lg *LatestGradient) Get(value float32, timestamp time.Time) float32

Get returns the gradient.

func (*LatestGradient) Update

func (lg *LatestGradient) Update(value float32, timestamp time.Time)

Update sets new values for the gradient.

func (*LatestGradient) UpdateAndGet

func (lg *LatestGradient) UpdateAndGet(value float32, timestamp time.Time) float32

UpdateAndGet is a thread safe method to calculate the gradient between the latest value and the current value. With each call to UpdateAndGet the given value and timestamp are stored internally. Furthermore the gradient is calculated by (currentValue-lastValue)/(currentTimeStamp-lastTimestamp).

type SimpleTime

type SimpleTime struct {
	Hour   uint `json:"hour,omitempty"`
	Minute uint `json:"minute,omitempty"`
}

SimpleTime just to express hours and minutes

func NewTime

func NewTime(hour, minute uint) (SimpleTime, error)

NewTime creates a new SimpleTime instance based on the given parameters

func NewTimeFromMinute

func NewTimeFromMinute(minutes uint) (SimpleTime, error)

NewTimeFromMinute creates a new SimpleTime instance based on the given parameters

func (SimpleTime) Minutes

func (s SimpleTime) Minutes() uint

Minutes returns the time in minutes

func (SimpleTime) String

func (s SimpleTime) String() string