Evan Lin kkdai

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

Writing a reddit bot with Go and OAuth2

Preface
Quick Start
Implicit Grant Authorization
See Also

Preface

Oh my zsh.

Install with curl

sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

Enabling Plugins (zsh-autosuggestions & zsh-syntax-highlighting)

Download zsh-autosuggestions by

	{
	"id": "nsqadmin-http",
	"kind": "Service",
	"apiVersion": "v1beta1",
	"port": 14171,
	"protocol": "TCP",
	"selector": { "name": "nsqadmin" }
	}

	NSURL *url = [NSURL URLWithString:@"http://opendata.dot.taipei.gov.tw/opendata/alldescriptions.json"];
	NSURLRequest *request = [NSURLRequest requestWithURL:url];
	[NSURLConnection sendAsynchronousRequest:request
	queue:[NSOperationQueue mainQueue]
	completionHandler:^(NSURLResponse response, NSData data, NSError *connectionError) {
	unsigned long big5 = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingBig5_HKSCS_1999);
	NSString *json = [[NSString alloc] initWithData:data encoding:big5];
	NSError *error;
	NSDictionary *dictionary =
	[NSJSONSerialization JSONObjectWithData:[json dataUsingEncoding:NSUTF8StringEncoding]

	package main

	import (
	"bufio"
	"flag"
	"fmt"
	"io"
	"os"
	"strings"
	)

	import (
	"archive/zip"
	"io"
	"os"
	"path/filepath"
	"strings"
	)

	func zipit(source, target string) error {
	zipfile, err := os.Create(target)

	~/tmp $ go build -gcflags=-S test-1.go \| more
	# command-line-arguments
	"".main t=1 size=256 value=0 args=0x0 locals=0x70
	0x0000 00000 (/Users/patrick/tmp/test-1.go:7) TEXT "".main(SB), $112-0
	0x0000 00000 (/Users/patrick/tmp/test-1.go:7) MOVQ (TLS), CX
	0x0009 00009 (/Users/patrick/tmp/test-1.go:7) CMPQ SP, 16(CX)
	0x000d 00013 (/Users/patrick/tmp/test-1.go:7) JLS 231
	0x0013 00019 (/Users/patrick/tmp/test-1.go:7) SUBQ $112, SP
	0x0017 00023 (/Users/patrick/tmp/test-1.go:7) FUNCDATA $0, gclocals·7d2d5fca80364273fb07d5820a76fef4(SB)
	0x0017 00023 (/Users/patrick/tmp/test-1.go:7) FUNCDATA $1, gclocals·5ef976c2593056b9243adf402ae9d952(SB)

	1. 編輯你的fullchain.pem vim /etc/letsencrypt/live/blaha.tw/fullchain.pem
	2. 把這個intermediate certificate(https://letsencrypt.org/certs/letsencryptauthorityx1.pem.txt)加入fullchain的兩個certificate中間
	3. restart你的webserver

	ln -s $(go list -f "{{.Dir}}" github.com/c9s/fsrename/fsrename) \
	$(go list -f "{{.Root}}" github.com/c9s/fsrename/fsrename)/src/fsrename