swissknife

README

swiss-knife

Library with all sorts of things to create code prototypes super fast

install

go get github.com/Sagleft/swiss-knife

usage example

package main

import (
    "fmt"
    swissknife "github.com/Sagleft/swiss-knife"
)

func main() {
    fmt.Println("Hello, World!")
    swissknife.RunInBackground()
}

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Documentation

Index

• func CheckErrors(errChecks ...ErrorFunc) error
• func FloatToString(val float64) string
• func FormatDuration(duration time.Duration) string
• func GetRandomInt(max int) int
• func GetRandomString(length int) string
• func GetValuePrecision(val float64) int
• func HttpGET(url string) ([]byte, error)
• func IntArrContains(a []int64, x int64) bool
• func IntArrFind(a []int64, x int64) int
• func IsFileExists(filepath string) bool
• func MD5(val []byte) string
• func ParseConfigFromEnv(cfgPointer any) error
• func ParseStructFromJSON(jsonBytes []byte, destinationPointer interface{}) error
• func ParseStructFromJSONFile(filepath string, destinationPointer interface{}) error
• func ParseStructFromYaml(jsonBytes []byte, destinationPointer interface{}) error
• func ParseStructFromYamlFile(filepath string, destinationPointer interface{}) error
• func PrintIntroMessage(appName, cryptoAddress string, cryptoCoinTag ...string)
• func PrintObject(o any)
• func ReadFile(filepath string) ([]byte, error)
• func ReadFileLines(filePath string) ([]string, error)
• func ReadFileToBytes(filepath string) ([]byte, error)
• func ReadFileToString(filepath string) (string, error)
• func Reconnect(task ReconnectTask)
• func RunInBackground()
• func SaveStringToFile(filepath string, content string) error
• func SaveStructToJSONFile(i interface{}, filepath string) error
• func SaveStructToJSONFileIndent(i interface{}, filepath string) error
• func SaveStructToYamlFile(i interface{}, filepath string) error
• func Ternary(statement bool, a, b interface{}) interface{}
• func WaitForAppFinish()
• type ChannelWorker
  • func NewChannelWorker(callback func(event interface{}), maxCapacity int) *ChannelWorker
  • func (w *ChannelWorker) AddEvent(event interface{})
  • func (w *ChannelWorker) GetMessagesAvailableCount() int
  • func (w *ChannelWorker) SetAsync(asyncMode bool) *ChannelWorker
  • func (w *ChannelWorker) Start()
  • func (w *ChannelWorker) Stop()
• type ConnFunc
• type ErrorFunc
• type ReconnectTask

Functions

func CheckErrors

func CheckErrors(errChecks ...ErrorFunc) error

CheckErrors - check some errors

func FloatToString

func FloatToString(val float64) string

FloatToString - convert float to string

func FormatDuration

func FormatDuration(duration time.Duration) string

FormatDuration - format duration 52h -> "2 days 4 hours"

func GetRandomInt

func GetRandomInt(max int) int

GetRandomInt returns non-negative pseudo-random number in the half-open interval [0,max)

func GetRandomString

func GetRandomString(length int) string

GetRandomString - superfast string generation. 139 ns/op 32 B/op 2 allocs/op. topic: https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-go

func GetValuePrecision

func GetValuePrecision(val float64) int

GetValuePrecision - find out the precision of the numeric value

func HttpGET

func HttpGET(url string) ([]byte, error)

func IntArrContains

func IntArrContains(a []int64, x int64) bool

IntArrContains indicates whether x is contained in a.

func IntArrFind

func IntArrFind(a []int64, x int64) int

IntArrFind find element index in arr. -1 if not found

func IsFileExists

func IsFileExists(filepath string) bool

IsFileExists - check file exists

func MD5

func MD5(val []byte) string

MD5 - calc MD5 checksum

func ParseConfigFromEnv

func ParseConfigFromEnv(cfgPointer any) error

func ParseStructFromJSON

func ParseStructFromJSON(jsonBytes []byte, destinationPointer interface{}) error

func ParseStructFromJSONFile

func ParseStructFromJSONFile(filepath string, destinationPointer interface{}) error

func ParseStructFromYaml

func ParseStructFromYaml(jsonBytes []byte, destinationPointer interface{}) error

func ParseStructFromYamlFile

func ParseStructFromYamlFile(filepath string, destinationPointer interface{}) error

func PrintIntroMessage

func PrintIntroMessage(appName, cryptoAddress string, cryptoCoinTag ...string)

PrintIntroMessage - publishes a funny message in the log asking to donate to the developer

func PrintObject

func PrintObject(o any)

func ReadFile

func ReadFile(filepath string) ([]byte, error)

ReadFile read file to string

func ReadFileLines

func ReadFileLines(filePath string) ([]string, error)

ReadFileLines - read file to lines

func ReadFileToBytes

func ReadFileToBytes(filepath string) ([]byte, error)

ReadFileToString read file to bytes

func ReadFileToString

func ReadFileToString(filepath string) (string, error)

ReadFileToString read file to string

func Reconnect

func Reconnect(task ReconnectTask)

Reconnect - setup reconnect

func RunInBackground

func RunInBackground()

RunInBackground - blocking method with no exit

func SaveStringToFile

func SaveStringToFile(filepath string, content string) error

SaveStringToFile save arbitrary string to file

func SaveStructToJSONFile

func SaveStructToJSONFile(i interface{}, filepath string) error

SaveStructToJSONFile save structure to JSON file

func SaveStructToJSONFileIndent

func SaveStructToJSONFileIndent(i interface{}, filepath string) error

SaveStructToJSONFileIndent save structure to JSON file

func SaveStructToYamlFile

func SaveStructToYamlFile(i interface{}, filepath string) error

SaveStructToYamlFile save structure to YAML file (in plain text)

func Ternary

func Ternary(statement bool, a, b interface{}) interface{}

Ternary operator. conditional operator usage example: var res = ternary(val > 0, "positive", "negative")

func WaitForAppFinish

func WaitForAppFinish()

Types

type ChannelWorker

type ChannelWorker struct {
	MaxCapacity          int
	Events               chan interface{}
	EventHandlerCallback func(event interface{})
	ProcessingEvents     bool
	IsFinished           bool
	// contains filtered or unexported fields
}

func NewChannelWorker

func NewChannelWorker(callback func(event interface{}), maxCapacity int) *ChannelWorker

func (*ChannelWorker) AddEvent

func (w *ChannelWorker) AddEvent(event interface{})

func (*ChannelWorker) GetMessagesAvailableCount

func (w *ChannelWorker) GetMessagesAvailableCount() int

func (*ChannelWorker) SetAsync

func (w *ChannelWorker) SetAsync(asyncMode bool) *ChannelWorker

func (*ChannelWorker) Start

func (w *ChannelWorker) Start()

Start handle events NOTE: it's blocking method

func (*ChannelWorker) Stop

func (w *ChannelWorker) Stop()

type ConnFunc

type ConnFunc func() error

ConnFunc - some func

type ErrorFunc

type ErrorFunc func() error

ErrorFunc - func with error result

type ReconnectTask

type ReconnectTask struct {
	ConnectionDescription      string // connection name
	ReconnectionAttemptsNumber int
	ConnectionTimeout          time.Duration
	ReconnectAfterTimeout      time.Duration
	WaitingBetweenAttempts     time.Duration

	// callbacks
	ConnCallback  ConnFunc
	ErrorCallback func(error)
	LogCallback   func(string)
}