go demo for TwinGo

prerequisites

• have go 1.11+ installed
• set env variables:
  • GOROOT to the directory of your go runtime
  • GOPATH to any other directory (go tools you install will be installed here, as well as any go code you write without using modules)
• run go mod tidy in the go_demo directory

ide

• IntelliJ has a golang Plugin that works reasonably well, but is discontinued because
• Jetbrains published GoLand as dedicated ide for Go
• Visual Studio Code also supports Go

running, building, testing

• go run [any_neccessary_files.go,...] will run main.main() found in the files supplied
• go build [any_neccessary_files.go,...] will build a binary for your architecture
• env GOOS=linux | GOARCH=arm GOarm=5 go build [any_neccessary_files.go,...] will build a binary for linux | running on arm v5
• env GOOS=linux | GOARCH=amd64 | go build [any_neccessary_files.go,...] will build a binary for linux | running on amd64 |
• go o test [-bench=.] will run any tests [and benchmarks] in the current directory (go recognizes tests by the _test suffix)
• go o test source.go source_test.go will run all tests found in source_test.go, you need to also provide the source to the compiler though.

supported architectures

GOOS	GOARCH
android	arm
darwin	386
darwin	amd64
darwin	arm
darwin	arm 64
dragonfly	amd64
freebsd	386
freebsd	amd64
freebsd	arm
linux	386
linux	amd64
linux	arm
linux	arm 64
linux	ppc64
linux	ppc64le
linux	mips
linux	mipsle
linux	mips64
linux	mips64le
netbsd	386
netbsd	amd64
netbsd	arm
openbsd	386
openbsd	amd64
openbsd	arm
plan9	386
plan9	amd64
solaris	amd64
windows	386
windows	amd64

initializing your own projects

$> mkdir myproject
$> go mod init mymodulename

then simply create .go files, and import github dependencies. go run | build | mod tidy | mod download will download any added dependencies and pin their version to the current ones.

benchmarking

https://flaviocopes.com/golang-profiling/

testing frameworks

there are many in development, none of which are as rich as the java landscape. go delivers the basics itself, but things like mocking has to be done by you.

This requires you to write testable code, iE use interfaces where you might need to mock.

Gos community has however come up with multiple ways to handle common use cases, eg. start docker containers for integrationtests, etc.

dependencies

To reinfoce go's base in open source, all major packages, libraries or frameworks are hosted on github. It is safe to assume, that major applications or storage engines have go bindings (elastic, solr, realtion databases, common no-sql engines like redis, mongo cassandra etc.)