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nanmu42 / pkcs7padding.go
Last active Dec 20, 2022
Golang PKCS7 Padding/Unpadding
View pkcs7padding.go
// 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
nanmu42 / openinbrowser.go
Created May 20, 2019
Golang: Open URL in Browser
View openinbrowser.go
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
nanmu42 / update_tmux.sh
Last active Apr 5, 2022
Update tmux to latest version
View update_tmux.sh
#!/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
nanmu42 / Flink: throttle messages to walkaround deadlock under heavy iteration feedback load.md
Last active Oct 11, 2021
Flink: throttle messages to walkaround deadlock under heavy iteration feedback load
View Flink: throttle messages to walkaround deadlock under heavy iteration feedback load.md
@nanmu42
nanmu42 / Dockerfile
Created Mar 22, 2021
Golang: Dockerfile based on Debian
View Dockerfile
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
nanmu42 / firstn.go
Created Mar 8, 2021
Golang: returns first n UTF-8 character at Most
View firstn.go
func firstNUTF8AtMost(s string, n int) string {
i := 0
for j := range s {
if i >= n {
return s[:j]
}
i++
}
return s
}
@nanmu42
nanmu42 / fileserver.go
Created Mar 6, 2021
Golang Quick Static File Server
View fileserver.go
package main
import (
"flag"
"fmt"
"net"
"net/http"
)
var (
@nanmu42
nanmu42 / Dockerfile
Last active Jan 29, 2021
Minimal-sized Golang Docker Image
View Dockerfile
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
nanmu42 / isPrivateIP.go
Created Jan 19, 2021
Golang: check if IP address is private
View isPrivateIP.go
// 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
nanmu42 / vue.config.js
Created Jan 13, 2021
A vue.config.js example for starting new project
View vue.config.js
const CompressionPlugin = require("compression-webpack-plugin");
const fileToCompressRegex = /\.(js|css|htm|html|svg|png|txt|json|wasm)$/
const productionMode = process.env.NODE_ENV === 'production'
let plugins = []
if (productionMode) {
plugins.push(new CompressionPlugin({
filename: '[path][base].br[query]',
algorithm: 'brotliCompress',
test: fileToCompressRegex,