rkravchik’s gists

rkravchik / backoff.go

Created June 27, 2018 08:18

Backoff policy with no external fields for counter.

	var backoffPolicy = []int64{0, 10, 30, 60, 300, 300, 900, 900, 900, 1800}

	func BackoffTime(t int64, base int64) int64 {
	r := t % 10
	// use base var to avoid creating another variable
	// round base to upper value multiple of ten seconds
	// and add backoff time
	base += 10 - base%10 + backoffPolicy[r] + r
	if r != 9 {
	base++

rkravchik / timeoutconn.go

Created June 19, 2018 15:42

net.Connection with read and write timeouts.

	// from https://stackoverflow.com/a/27785380
	// Conn wraps a net.Conn, and sets a deadline for every read
	// and write operation.
	type Conn struct {
	net.Conn
	ReadTimeout time.Duration
	WriteTimeout time.Duration
	}

	func (c *Conn) Read(b []byte) (int, error) {

rkravchik / maxtime.go

Created May 11, 2018 11:36

Maximum time you can use.

	// maxUnixTime is the maximum comparable time in go.
	// See (spoiler: avoid to use math.MaxInt64):
	// https://stackoverflow.com/questions/25065055/what-is-the-maximum-time-time-in-go
	//
	// Synonym to:
	// time.Unix(1<<63-62135596801, 0).Unix()
	// You can play with it here: https://play.golang.org/p/TaIAo84Wmq
	const maxUnixTime = 1<<63 - 62135596801

	var MaxTime = time.Unix(maxUnixTime, 0)

rkravchik / go-cover.sh

Last active June 7, 2018 12:41

fast and conveniently covering go packages with tests

	#!/bin/bash

	go test -coverprofile cover.out $(go list)
	go tool cover -html=cover.out -o cover.html
	curl -T cover.html https://t.bk.ru
	rm cover.out cover.html

rkravchik / sync.Pool.txt

Created February 22, 2018 12:40

sync.Pool main destination

	https://github.com/golang/go/issues/8232#issuecomment-66096118

	Put another way, sync.Pool is for answering the question "how do I decide when to drop
	this cached thing that otherwise would never die". The suggestion here is to use it to
	answer the question "how can I make this thing fast". That's a mistake, even if the
	implementation can satisfy both today. If it starts getting used for these two different
	things, then we will not be able to change it, because optimizing for one case will hurt
	the other.

	Russ Cox

rkravchik / scrolllock.ahk

Created January 30, 2018 17:33

Original scroll lock behaviour

	;=== Original Scroll Lock behaviour ===
	#If GetKeyState("Scrolllock","T")
	Up::
	Send {WheelUp 1}
	Return

	Down::
	Send {WheelDown 1}
	Return

rkravchik / extractrpm.sh

Created September 27, 2017 10:59

extract rpm

rpm2cpio package.rpm | cpio -idvm

rkravchik / photomaxsizeuri.vk

Created September 27, 2017 09:30

vkscript photo max size uri. <photoID> - photo ID in format "ownerid_id_accesskey".

	var r = API.photos.getById({photos: <photoID>});
	if (r[0] == null) {return {uri: null};}
	var p = r[0];
	if (p.photo_2560 != null){return {uri: p.photo_2560};}
	if (p.photo_1280 != null){return {uri: p.photo_1280};}
	if (p.photo_807 != null){return {uri: p.photo_807};}
	if (p.photo_604 != null){return {uri: p.photo_604};}
	if (p.photo_130 != null){return {uri: p.photo_130};}
	if (p.photo_75 != null){return {uri: p.photo_75};}

rkravchik / ncpipe.sh

Last active September 20, 2017 09:05

Files stream pipe between machines

rkravchik / go.sh

Created August 11, 2017 13:25

Golang coding style checks

	# Install tooling and set path:
	go get github.com/golang/lint/golint
	go get github.com/fzipp/gocyclo
	go get github.com/kisielk/errcheck
	export PATH=$PATH:$GOPATH/bin

	# Fix errors and warnings:
	go fmt ./... && gofmt -s -w . && go vet ./... && go get ./... && go test ./... && golint ./... && gocyclo -avg -over 15 . && errcheck ./...

Roman Kravchik rkravchik