nanmu42

// pkcs7strip remove pkcs7 padding
func pkcs7strip(data []byte, blockSize int) ([]byte, error) {
	length := len(data)
	if length == 0 {
		return nil, errors.New("pkcs7: Data is empty")
	}
	if length%blockSize != 0 {
		return nil, errors.New("pkcs7: Data is not block-aligned")
	}
	padLen := int(data[length-1])

nanmu42

#!/usr/bin/env bash

set -e

# dependecies
apt update
apt install -y git automake build-essential pkg-config libevent-dev libncurses5-dev byacc

# where our temp file locates
rm -rf /tmp/tmux

nanmu42

// source: https://stackoverflow.com/questions/41240761/check-if-ip-address-is-in-private-network-space
var privateIPBlocks []*net.IPNet

func init() {
	for _, cidr := range []string{
		"127.0.0.0/8",    // IPv4 loopback
		"10.0.0.0/8",     // RFC1918
		"172.16.0.0/12",  // RFC1918
		"192.168.0.0/16", // RFC1918
		"169.254.0.0/16", // RFC3927 link-local

nanmu42

This is the gist version of my blog post Quick Dockerfile for Python Poetry Projects.

I hope you find it useful.

nanmu42

FROM golang:1-alpine as golang
RUN apk --no-cache add git zip tzdata ca-certificates
# avoid go path, use go mod
WORKDIR /app
COPY . .
RUN CGO_ENABLED=0 go build -ldflags "-s -w -extldflags "-static"" ./cmd/appnamehere
WORKDIR /usr/share/zoneinfo
# -0 means no compression.  Needed because go's
# tz loader doesn't handle compressed data.
RUN zip -r -0 /zoneinfo.zip .

nanmu42

{
   "123":"application/vnd.lotus-1-2-3",
   "ez":"application/andrew-inset",
   "aw":"application/applixware",
   "atom":"application/atom+xml",
   "atomcat":"application/atomcat+xml",
   "atomsvc":"application/atomsvc+xml",
   "ccxml":"application/ccxml+xml",
   "cdmia":"application/cdmi-capability",
   "cdmic":"application/cdmi-container",

nanmu42

func openBrowser(url string) {
	var err error

	switch runtime.GOOS {
	case "linux":
		err = exec.Command("xdg-open", url).Start()
	case "windows":
		err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
	case "darwin":
		err = exec.Command("open", url).Start()

nanmu42

Flink has a deadlock case and can be caused by the combination of Flink's backpressure mechanism with iterations (more likely when there is heavy feedback load).

There is a proposal to resolve this issue, but it seems to be abondoned.

The walkaround, suggested by Gábor Hermann, is to throttle messages into the iteration.

Here is my implementation.

nanmu42

FROM golang:buster as golang
RUN apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get install -y \
    ca-certificates \
    tzdata \
    build-essential \
    tar \
    bash
WORKDIR /app
COPY . .

nanmu42

func firstNUTF8AtMost(s string, n int) string {
	i := 0
	for j := range s {
		if i >= n {
			return s[:j]
		}
		i++
	}
	return s
}