Go At Work - Speaker Deck

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digitalocean.com Go At Work

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digitalocean.com Go At DigitalOcean

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digitalocean.com Bryan Liles @bryanl @digitalocean

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digitalocean.com Wow GO!

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digitalocean.com

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digitalocean.com Dependencies :|

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digitalocean.com package main import "github.com/go-martini/martini" func main() { m := martini.Classic() m.Get("/", func() string { return "Hello world!" }) m.Run() }

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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") }

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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) }

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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!") }

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digitalocean.com “You wouldn’t go around picking stuﬀ oﬀ the street and eating it. Why do so with your dependencies?”

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digitalocean.com Fancy Stuﬀ Standard Lib

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digitalocean.com Standard Lib Fancy Stuﬀ

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digitalocean.com Standard Lib Fancy Stuﬀ

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digitalocean.com Fancy Stuﬀ Standard Lib

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digitalocean.com Managing the GOPATH

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digitalocean.com There’s more than one way to do it.

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digitalocean.com single GOPATH

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digitalocean.com GOPATH for each project

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digitalocean.com Dependency manager

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digitalocean.com Go @digitalocean

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digitalocean.com single GOPATH

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digitalocean.com a DOGE

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digitalocean.com vendor repos import "bits.do.co/vendor/cli"

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digitalocean.com Beyond gofmt

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digitalocean.com Sometimes the default sorting of your imports just doesn’t satisfy…

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digitalocean.com import ( "database/sql" "doge/log" "doge/notify" "fmt" "os" "services/migration" "time" _ "github.com/go-sql-driver/mysql" "github.com/ianschenck/envflag" )

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digitalocean.com import ( "database/sql" "fmt" "os" "time" "doge/log" "doge/notify" "services/migration" _ "github.com/go-sql-driver/mysql" "github.com/ianschenck/envflag" )

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digitalocean.com http://golang.org/pkg/go/parser/ (and friends)

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digitalocean.com Test the GO

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digitalocean.com You are writing tests, right?

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digitalocean.com func TestSquare(t *testing.T) { expected := 25 got := square(5) if got != expected { t.Errorf("expected %d, got %d", expected, got) } }

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digitalocean.com undefined: square

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digitalocean.com func square(x int) int { return 0 }

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digitalocean.com --- FAIL: TestSquare (0.00 seconds) square_test.go:14: expected 25, got 0 FAIL

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digitalocean.com func square(x int) int { return 25 }

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digitalocean.com $ go test . ok _/Users/bryan/gothamgo2014 0.005s

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digitalocean.com func TestSquare0(t *testing.T) { expected := 0 got := square(0) if got != expected { t.Errorf("expected %d, got %d", expected, got) } }

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digitalocean.com --- FAIL: TestSquare0 (0.00 seconds) square_test.go:23: expected 0, got 25 FAIL

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digitalocean.com func square(x int) int { return x * x }

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digitalocean.com go test . ok _/Users/bryan/gothamgo2014 0.006s

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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) } } }

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digitalocean.com looper https://github.com/nathany/looper

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digitalocean.com

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digitalocean.com GoConvey http://goconvey.co/

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digitalocean.com

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digitalocean.com • 10 things you (probably) don't know about Go • Testing Techniques

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digitalocean.com Code Reviews

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digitalocean.com https://code.google.com/p/go-wiki/wiki/CodeReviewComments Start here