{"id":570,"date":"2022-04-23T18:42:29","date_gmt":"2022-04-23T18:42:29","guid":{"rendered":"https:\/\/andrejacobs.org\/?p=570"},"modified":"2022-04-27T09:53:19","modified_gmt":"2022-04-27T09:53:19","slug":"learning-go-day-6","status":"publish","type":"post","link":"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/","title":{"rendered":"Learning Go &#8211; Day 6"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Featured image by&nbsp;<a href=\"https:\/\/github.com\/egonelbre\/gophers\" target=\"_blank\" rel=\"noreferrer noopener\">Egon Elbre<\/a><\/p>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><ul>\n<li>YouTube video of the day\n<ul>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=nok0aYiGiYA\">GopherCon 2019: Dave Cheney &#8211; Two Go Programs, Three Different Profiling Techniques<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Lets continue on our journey<\/h3>\n<p>Installing Go (1.18) using the download from <a href=\"https:\/\/go.dev\/\">https:\/\/go.dev\/<\/a> on macOS Monterey, the GOPATH environment variable is not set by default. However reading the help for <code>go help install<\/code> they state the following.<\/p>\n<blockquote>\n<p>Executables are installed in the directory named by the GOBIN environment\nvariable, which defaults to $GOPATH\/bin or $HOME\/go\/bin if the GOPATH\nenvironment variable is not set.<\/p>\n<\/blockquote>\n<p><strong>NOTE:<\/strong> At this point in time you might get some conflicting or out of date information regarding how to start a go project and or to do with paths. From what I can tell is that at some point they added modules to go and also allowed you to have your modules\/code outside of the GOPATH.<\/p>\n<pre><code class=\"language-bash\">$ ls ~\/go\nbin\/ pkg\/\n<\/code><\/pre>\n<ul>\n<li>Installing a module.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ go install github.com\/spf13\/cobra-cli@latest\ngo: downloading github.com\/spf13\/cobra-cli v1.3.0\ngo: downloading github.com\/spf13\/cobra v1.3.0\n...\n<\/code><\/pre>\n<ul>\n<li>Binaries will go to <code>$GOPATH\/bin<\/code> or <code>$HOME\/go\/bin<\/code> as stated by the documentation.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ ls -la ~\/go\/bin\n...\n-rwxr-xr-x  1 andre  staff   7.9M 27 Apr 10:40 cobra-cli*\n<\/code><\/pre>\n<ul>\n<li>Modules go to <code>$GOPATH\/pkg\/mod<\/code> or <code>$HOME\/go\/pkg\/mod<\/code>.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ ls ~\/go\/pkg\/mod\ncache\/      github.com\/ golang.org\/ gopkg.in\/   honnef.co\/  mvdan.cc\/\n\n$ ls ~\/go\/pkg\/mod\/github.com\nfsnotify\/   hashicorp\/  magiconair\/ mitchellh\/  pelletier\/  spf13\/      subosito\/   yuin\/\n<\/code><\/pre>\n<ul>\n<li>Installing a package. Note not everything is a module and you will need to install packages using <code>go get<\/code>. You run this from the directory in which your <code>go.mod<\/code> file lives.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">$ go get -u github.com\/spf13\/cobra@latest\ngo: downloading github.com\/spf13\/cobra v1.4.0\ngo: downloading github.com\/inconshreveable\/mousetrap v1.0.0\n...\n\n$ cat go.mod\nmodule learn\n\ngo 1.18\n\nrequire (\n\tgithub.com\/inconshreveable\/mousetrap v1.0.0 \/\/ indirect\n\tgithub.com\/spf13\/cobra v1.4.0 \/\/ indirect\n\tgithub.com\/spf13\/pflag v1.0.5 \/\/ indirect\n)\n<\/code><\/pre>\n<ul>\n<li>Formatting code to look like every one else\u2019s code using <code>gofmt<\/code>. I hear people on YouTube pronounce it \u201cgo fomt\u201d and same for the fmt package being pronounced \u201cfomt\u201d.\nVisual Studio Code with the Go extension automatically does the formatting on save.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ gofmt --help\nusage: gofmt [flags] [path ...]\n  -cpuprofile string\n    \twrite cpu profile to this file\n  -d\tdisplay diffs instead of rewriting files\n  -e\treport all errors (not just the first 10 on different lines)\n  -l\tlist files whose formatting differs from gofmt's\n  -r string\n    \trewrite rule (e.g., 'a[b:len(a)] -&gt; a[b:]')\n  -s\tsimplify code\n  -w\twrite result to (source) file instead of stdout\n\n# To format a file in place\n$ gofmt -s -w \/path\/to\/file.go\n<\/code><\/pre>\n<h3>Documentation right at your fingertips<\/h3>\n<ul>\n<li>You can lookup documentation for packages from the shell.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">$ go doc PACKAGE\n\n$ go doc flag\n...\n\n# See the documentation for flag.StringVar function\n$ go doc flag.StringVar\npackage flag \/\/ import &quot;flag&quot;\n\nfunc StringVar(p *string, name string, value string, usage string)\n    StringVar defines a string flag with specified name, default value, and\n    usage string. The argument p points to a string variable in which to store\n    the value of the flag.You can also use [godoc](http:\/\/golang.org\/x\/tools\/cmd\/godoc) to serve the documentation from your local machine.\n<\/code><\/pre>\n<ul>\n<li>You can find the list of standard library packages here: <a href=\"https:\/\/pkg.go.dev\/std\">https:\/\/pkg.go.dev\/std<\/a><\/li>\n<\/ul>\n<h3>Parsing CLI flags<\/h3>\n<p>I have seen a number of people use <a href=\"https:\/\/github.com\/spf13\/cobra\">Cobra<\/a> and <a href=\"https:\/\/github.com\/spf13\/viper\">Viper<\/a> from <a href=\"https:\/\/github.com\/spf13\">spf13<\/a> (which rang a bell with me from when I used <a href=\"https:\/\/gohugo.io\/\">Hugo<\/a> in 2016, nice one I see he now works for Google).<\/p>\n<p>However the standard library includes the <code>flag<\/code> package that suits most basic needs.<\/p>\n<p>Example of parsing a string flag named \u201cflagName\u201d.<\/p>\n<pre><code class=\"language-go\">import &quot;flag&quot;\n\nvar name string\nflag.StringVar(&amp;name, &quot;flagName&quot;, &quot;default value&quot;, &quot;help description&quot;\nflag.Parser()\n<\/code><\/pre>\n<p>Usage would be:<\/p>\n<pre><code class=\"language-bash\">$ go run . --help\n...\n  -flagName string\n      help description (default &quot;default value&quot;)\n\n$ go run . -flagName Awesome\n<\/code><\/pre>\n<ul>\n<li>fmt.Printf supports \u201c%q\u201d that will wrap a string in quotes in the output. Thats nice!<\/li>\n<li>Note: You can use single hyphen \u201c-flagName\u201d or double hyphen \u201c\u2014flagName\u201d.<\/li>\n<li>You can exit a program with <code>panic<\/code> to indicate something went bust.<\/li>\n<li>Note: A nice package for some extra string manipulation is <code>strings<\/code> from the standard library.<\/li>\n<\/ul>\n<h3>Cross compiling<\/h3>\n<p>Recall that you can set the environment variable <code>GOOS<\/code> to \u201clinux\u201d, \u201cdarwin\u201d or \u201cwindows\u201d for the operating system before issuing <code>go build<\/code>.<\/p>\n<p>You can also set the CPU architecture using the environment variable <code>GOARCH<\/code>.<\/p>\n<p>For example: <code>GOOS=linux GOARCH=arm64 go build -o linux-arm64<\/code><\/p>\n<h3>Seeing is believing<\/h3>\n<p>I want to test out this theory of cross compiling a binary to be run on another system. In fact the whole reason I got into learning Go is because I have some applications I want to run on my own Linux server.<\/p>\n<p>The test is to cross compile a binary from my M1 Mac (arm64) and deploy it to my Ubuntu Linux running on Intel (amd64).<\/p>\n<p>This <a href=\"https:\/\/stackoverflow.com\/questions\/36024542\/how-do-i-determine-whether-the-program-was-built-as-32-bit-or-64-bit-in-go\">answer<\/a> from SO has a good list of platforms.<\/p>\n<ul>\n<li>Hello world program<\/li>\n<\/ul>\n<pre><code class=\"language-go\">package main\n\nimport (\n\t&quot;fmt&quot;\n)\n\nfunc main() {\n\tfmt.Println(&quot;Hello world!&quot;)\n}\n<\/code><\/pre>\n<ul>\n<li>Build as normal on the M1 Mac to see what the architecture is. The executable is in the Mach-O format and for arm64.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ go build\n$ file learngo\nlearngo: Mach-O 64-bit executable arm64\n<\/code><\/pre>\n<ul>\n<li>Build for my Intel Linux machine. The executable should be in the ELF format for amd64 (aka x86-64)<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ GOOS=linux GOARCH=amd64 go build\n$ file learngo\nlearngo: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=LRHZBB1HCcIFDEba0O6c\/Py1hw-sG8Pu6TgGtF0rJ\/SFoJuDdRWvikPZWchfmu\/dTdG6qmbhalIb0BLOgw0, not stripped\n<\/code><\/pre>\n<ul>\n<li>Transfer to my Linux machine and run to verify this works.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ rsync -av learngo andre@SERVER:\/home\/andre\/\n\n$ # SSH into my linux server\nandre@simba:~$ file learngo\nlearngo: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=LRHZBB1HCcIFDEba0O6c\/Py1hw-sG8Pu6TgGtF0rJ\/SFoJuDdRWvikPZWchfmu\/dTdG6qmbhalIb0BLOgw0, not stripped\n\nandre@simba:~$ .\/learngo\nHello world!\n<\/code><\/pre>\n<ul>\n<li>Okay this is pretty cool!<\/li>\n<li>Can I build a go binary on my Linux machine to run on my M1 Mac? I will come back later to explore this question once I have installed Go on my Ubuntu Linux machine.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Featured image by&nbsp;Egon Elbre [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":2,"featured_media":567,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[52],"tags":[53],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Learning Go - Day 6 - Andr\u00e9 Jacobs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learning Go - Day 6 - Andr\u00e9 Jacobs\" \/>\n<meta property=\"og:description\" content=\"Featured image by&nbsp;Egon Elbre [...]Read more &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/\" \/>\n<meta property=\"og:site_name\" content=\"Andr\u00e9 Jacobs\" \/>\n<meta property=\"article:published_time\" content=\"2022-04-23T18:42:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-04-27T09:53:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2022\/04\/poking-fire.png\" \/>\n\t<meta property=\"og:image:width\" content=\"610\" \/>\n\t<meta property=\"og:image:height\" content=\"504\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Andr\u00e9 Jacobs\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@andrejacobs81\" \/>\n<meta name=\"twitter:site\" content=\"@andrejacobs81\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Andr\u00e9 Jacobs\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-6\/\"},\"author\":{\"name\":\"Andr\u00e9 Jacobs\",\"@id\":\"https:\/\/andrejacobs.org\/#\/schema\/person\/3d38360883015e883c80c2fb875c5a68\"},\"headline\":\"Learning Go &#8211; 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