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Go At Work
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Bryan Liles
December 18, 2014
Programming
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220
Go At Work
You know how to program Go. How do you program Go at work?
Bryan Liles
December 18, 2014
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Transcript
digitalocean.com Go At Work
digitalocean.com Go At DigitalOcean
digitalocean.com Bryan Liles @bryanl @digitalocean
digitalocean.com Wow GO!
digitalocean.com
digitalocean.com Dependencies :|
digitalocean.com package main import "github.com/go-martini/martini" func main() { m :=
martini.Classic() m.Get("/", func() string { return "Hello world!" }) m.Run() }
digitalocean.com package main import ( "fmt" "net/http" "github.com/codegangsta/negroni" ) func
main() { mux := http.NewServeMux() mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) { fmt.Fprintf(w, "Hello world!") }) n := negroni.Classic() n.UseHandler(mux) n.Run(":3000") }
digitalocean.com package main import ( "fmt" "net/http" ) func handler(w
http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello world!") } func main() { http.HandleFunc("/", handler) http.ListenAndServe(":3000", nil) }
digitalocean.com package main import ( "fmt" "net/http" "github.com/gorilla/mux" ) func
main() { r := mux.NewRouter() r.HandleFunc("/", homeHandler) http.Handle("/", r) http.ListenAndServe(":3000", nil) } func homeHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, "Hello world!") }
digitalocean.com “You wouldn’t go around picking stuff off the street
and eating it. Why do so with your dependencies?”
digitalocean.com Fancy Stuff Standard Lib
digitalocean.com Standard Lib Fancy Stuff
digitalocean.com Standard Lib Fancy Stuff
digitalocean.com Fancy Stuff Standard Lib
digitalocean.com Managing the GOPATH
digitalocean.com There’s more than one way to do it.
digitalocean.com single GOPATH
digitalocean.com GOPATH for each project
digitalocean.com Dependency manager
digitalocean.com Go @digitalocean
digitalocean.com single GOPATH
digitalocean.com a DOGE
digitalocean.com vendor repos import "bits.do.co/vendor/cli"
digitalocean.com Beyond gofmt
digitalocean.com Sometimes the default sorting of your imports just doesn’t
satisfy…
digitalocean.com import ( "database/sql" "doge/log" "doge/notify" "fmt" "os" "services/migration" "time"
_ "github.com/go-sql-driver/mysql" "github.com/ianschenck/envflag" )
digitalocean.com import ( "database/sql" "fmt" "os" "time" "doge/log" "doge/notify" "services/migration"
_ "github.com/go-sql-driver/mysql" "github.com/ianschenck/envflag" )
digitalocean.com http://golang.org/pkg/go/parser/ (and friends)
digitalocean.com Test the GO
digitalocean.com You are writing tests, right?
digitalocean.com func TestSquare(t *testing.T) { expected := 25 got :=
square(5) if got != expected { t.Errorf("expected %d, got %d", expected, got) } }
digitalocean.com undefined: square
digitalocean.com func square(x int) int { return 0 }
digitalocean.com --- FAIL: TestSquare (0.00 seconds) square_test.go:14: expected 25, got
0 FAIL
digitalocean.com func square(x int) int { return 25 }
digitalocean.com $ go test . ok _/Users/bryan/gothamgo2014 0.005s
digitalocean.com func TestSquare0(t *testing.T) { expected := 0 got :=
square(0) if got != expected { t.Errorf("expected %d, got %d", expected, got) } }
digitalocean.com --- FAIL: TestSquare0 (0.00 seconds) square_test.go:23: expected 0, got
25 FAIL
digitalocean.com func square(x int) int { return x * x
}
digitalocean.com go test . ok _/Users/bryan/gothamgo2014 0.006s
digitalocean.com func TestSquare(t *testing.T) { cases := []struct { arg
int expected int }{ {5, 25}, {0, 0}, {-1, 1}, } for i, c := range cases { got := square(c.arg) if got != c.expected { t.Errorf("case %d: expected %d, got %d", i, c.expected, got) } } }
digitalocean.com looper https://github.com/nathany/looper
digitalocean.com
digitalocean.com GoConvey http://goconvey.co/
digitalocean.com
digitalocean.com • 10 things you (probably) don't know about Go
• Testing Techniques
digitalocean.com Code Reviews
digitalocean.com https://code.google.com/p/go-wiki/wiki/CodeReviewComments Start here
digitalocean.com WHY > HOW
digitalocean.com Continuous Integration
digitalocean.com Drone CI
digitalocean.com We ❤️ Artifacts
digitalocean.com Deploying GO
digitalocean.com Little Deploys = ansible
digitalocean.com Big Deploys = Chef
digitalocean.com
digitalocean.com The End.