�ݺ�ߣ

Go? ? ???? ????
Go? ??? ?? ??? ????? ??? ??? ??? ???
DEVSISTERS ???
1

? Go????
Go? ? ???? ????
?? ??? ??
and
4

? Go????
Go? ? ???? ????
??
???? ?? ????
Spring ????��
?? ?? ????? Scalable?? ???
== MySQL ? ??? ???? ??
?? ??? ? ??? ?
C++ (quic), lua (?? ??), ��
5

? Go????
Go? ? ???? ????
???
6

? Go????
Go? ? ???? ????
Type safety
7

? Go????
Go? ? ???? ????
Type safety ???? ??
8

? Go????
Go? ? ???? ????
Type safety ???? ?? IDE support
9

? Go????
Go? ? ???? ????
Type safety ???? ?? IDE support ???? ???
10

? Go????
Go? ? ???? ????
?��?? ????!?
11

? Go????
Go? ? ???? ????
???? ????
???
?? ??
??
12

? Go????
Go? ? ???? ????
???? ???? ?? ?? ??? ?
???
?? ??
??
?? ??
?? ??
??? ????
13

? Go????
Go? ? ???? ????
???? ???? ?? ?? ??? ? Deploy?? ????
???
?? ??
??
?? ??
?? ??
??
???
???
?? ??? ????
14

? Go????
Go? ? ???? ????
?? ????
15

? Go????
Go? ? ???? ????
Go? ???? ??? ?
17

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? Channel? ??? ??? Concurrency ??
18

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? ??? ???!
19
????? ?? ??? ?? ??? ??? ???
�� ? ???? ?? ??? ???? ?? ??
�� ????? ???? ?? ??? ???

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? ??? ???!
? ??? ?? ???? ?? ??? ??
20

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? ??? ???!
? ??? ?? ???? ?? ??? ??
? Interface? ???
21
?? Cap��n proto? protobuf? ?? serialization library??
??? ??

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? ??? ???!
? ??? ?? ???? ?? ??? ??
? Interface? ???
? ?? ??? ??? ?? ?? ??? ???? ??? ??
22

? Go????
Go? ? ???? ????
Go? ???? ??? ?
? ??? ???!
? ??? ?? ???? ?? ??? ??
? Interface? ???
? ?? ??? ??? ?? ?? ??? ???? ??? ??
? ?? ???? ??? ???
23

? Go????
Go? ? ???? ????
????? ???
24

? Go????
Go? ? ???? ????
????? ??
? ??? Full-featured Debugger? ??
the ability to use the debugger to understand a Go program's
full environment will likely never work, and improving gdb
support is not a priority for the team.
- Rob Pike, on March 2014
???? Debugger (gdb, lldb, delve, godebug, ��) ?
? ??? ???? Go ?? ??? ??? print?? ????
? Function call ? ???? ???
? Goroutine? ?? ?? ? ??? ???? ???
25

? Go????
Go? ? ???? ????
????? ??
? ?? ??? ????? ???? ????? ??
26

? Go????
Go? ? ???? ????
????? ??
? ?? ??? ????? ???? ????? ??
? ?? ?? ??? ????��
Simple Typing? ?? ??? ? ????��
??? Generic? ????
Int8Contains, Int16Contains, Int32Contains, Int64Contains,
Int8Random, Int16Random, ��? ???? ???? ?��
28

? Go????
Go? ? ???? ????
????? ??
? ?? ??? ????? ???? ????? ??
? ??? Generic? ????
? ??? ?? ??? ?? ?? ???
if err := (��); err != nil { return err }
?? ?? ??? ???? ??? ???? ??? ??
29

Concurrent Map
??, ??, ??��
Go? ? ???? ???? 31
Go? map? thread-safe ?? ??

Concurrent Map
??, ??, ??��
Go? ? ???? ???? 32
type Director struct {
pidMap map[int]*Actor
}
func (d *Director) Start() (*Actor, Pid) {
pid := d.createPid()
actor := NewActor(pid)
d.pidMap[pid] = actor
return actor, pid
}
panic: runtime error: invalid memory address or nil pointer dereference

Concurrent Map
??, ??, ??��
Go? ? ???? ???? 33
type Director struct {
sync.RWMutex
pidMap map[int]*Actor
}
func (d *Director) Start() (*Actor, Pid) {
pid := d.createPid()
actor := NewActor(pid)
d.Lock()
defer d.Unlock()
d.pidMap[pid] = actor
return actor, pid
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 34
func AssertPositive(i int) *MathError {
if i < 0 {
return &MathError{i}
}
return nil
}
func Root(i int) (int, error) {
err := AssertPositive(i)
if err != nil {
return 0, err
}
return int(math.Sqrt(float64(i))), err
}
func main() {
sqrt, err := Root(81)
if err != nil {
fmt.Println("error is not nil:", err)
} else {
fmt.Println(sqrt)
}
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 35
if i < 0 {
}
return nil
}
if err != nil {
return 0, err
}
}
func main() {
if err != nil {
} else {
fmt.Println(sqrt)
}
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 36
if i < 0 {
}
return nil
}
if err != nil {
return 0, err
}
}
func main() {
if err != nil {
} else {
fmt.Println(sqrt)
}
}
type: *MathError
Value: nil
type: error (interface)
Value: typed nil >.<
Error interface? ???? ?
?? nil??? type? nil? ????
Interface nil? ?? ??

Typed nil
??, ??, ??��
Go? ? ???? ???? 37
if i < 0 {
}
return nil
}
if err != nil {
return 0, err
}
return int(math.Sqrt(float64(i))), nil
}
func main() {
if err != nil {
} else {
fmt.Println(sqrt)
}
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 38
func RootStr(s string) (int, error) {
i, err := strconv.Atoi(s)
if err != nil {
return 0, err
}
err = AssertPositive(i)
if err != nil {
return 0, err
}
}
func main() {
sqrt, err := RootStr("81")
if err != nil {
} else {
fmt.Println(sqrt)
}
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 39
func RootStr(s string) (int, error) {
i, err := strconv.Atoi(s)
if err != nil {
return 0, err
}
err = AssertPositive(i)
if err != nil {
return 0, err
}
}
func main() {
sqrt, err := RootStr("81")
if err != nil {
} else {
fmt.Println(sqrt)
}
}

Typed nil
??, ??, ??��
Go? ? ???? ???? 40
Nil? ???? ????? ��nil��??? ??? ??? ?
(X) if err == nil { return response, err }
(O) if err == nil { return response, nil }

Typed nil
??, ??, ??��
Go? ? ???? ???? 41
Nil? ???? ????? ��nil��??? ??? ??? ?
?? ?? ??? err ??? ??? ????? ? ?
if err := Something(); err != nil { ... }
? ??? ???? if? ??? ??? Scope? ????? ?? ??

Typed nil
??, ??, ??��
Go? ? ???? ???? 42
Nil? ???? ????? ��nil��??? ??? ??? ?
?? ?? ??? err ??? ??? ????? ? ?
??? ??? ??? ?? ??? return type? ��error�� ?????? ??? ?

??, ??, ??��
Go? ? ???? ???? 43
??? ?? ???

??? ?? ???
??, ??, ??��
Go? ? ???? ???? 44
//go:generate ./some_runnable_command_here.sh �Copt1 --opt2=foobar
$ go generate
$ go build
$ go test

??? ?? ???
??, ??, ??��
Go? ? ???? ???? 45
cat <<< "
package generated
var BaseDir = "$BASEDIR"
var Version = struct {
ServerRevision string
ProtocolRevision string
DeployDate string
}{
"$SERVER_HASH",
"$PROTOCOL_HASH",
"$DEPLOY_DATE",
}
" > generated/version.go

??? ?? ???
??, ??, ??��
Go? ? ???? ???? 46
type Ints []int
func (a Ints) Val() []int
func (a Ints) Copy() Ints
func (a Ints) Cut(i int, j int)
func (a Ints) Insert(i int, x int) Ints
func (a Ints) Append(x ...int) Ints
func (a Ints) Reverse()
func (a Ints) Filter(f func(i int, value interface{}) bool) Ints
func (a Ints) Each(f func(i int, value interface{}))
func (a Ints) Map(f func(i int, value interface{}) int) Ints
Type Int32s []int32
......
Type Int64s []int64

??? ?? ???
??, ??, ??��
Go? ? ???? ???? 47
? shell script? ???
? ?? ??? ??? ?? ??? ??? ?
? Go, Python ?? ??? ???????
? ??? ??? ??! ???, ???? ?? ?? ??? ?
? ? ?? ? ?
? Go? ast, parser ??? ???
? ?? ? ??? ast, parser? ??? ??? ?? ??
? ???? ??? ??
? ??? ?? ?? ? ???? ??��

vim-go
??? ??? ??????
Go? ? ???? ???? 49

Godeps
??? ??? ??????
Go? ? ???? ???? 50
? Dependency Manager & Vendoring tool
? Copy all dependencies into Workspace
directory ( ~= virtualenv in Python )
? Fix Go version, Library version, ��
{
"ImportPath": "github.com/devsisters/gb-server",
"GoVersion": "go1.4.2",
"Deps": [
{
"ImportPath": "golang.org/x/net/context",
"Rev": "0b492c5a9642fa1365f77ad20bbb259a25572507"
},
{
"ImportPath": "golang.org/x/oauth2",
"Rev": "ce5ea7da934b76b1066c527632359e2b8f65db97"
},
{
"ImportPath": "google.golang.org/api/googleapi",
"Rev": "c34364630fd76916db716b46fd3a75403b161768"
},
....

go-errors
??? ??? ??????
Go? ? ???? ????
var Crashed = errors.Errorf("oh dear")
func Crash() error {
return errors.New(Crashed)
}
if err != nil {
if errors.Is(err, crashy.Crashed) {
fmt.Println(err.(*errors.Error).ErrorStack())
} else {
panic(err)
}
}
51

GoConvey
??? ??? ??????
Go? ? ???? ????
http://goconvey.co/
52

GoConvey
??? ??? ??????
Go? ? ???? ????
http://goconvey.co/
53

GoConvey
??? ??? ??????
Go? ? ???? ????
http://goconvey.co/
54

Test function
testing/quick
??? ??? ??????
Go? ? ???? ????
func TestOddMultipleOfThree(t *testing.T) {
f := func(x int) bool {
y := OddMultipleOfThree(x)
return y%2 == 1 && y%3 == 0
}
if err := quick.Check(f, nil); err != nil {
t.Error(err)
}
}
Target function
Inject random
valid parameter
Check if target function
is working well
55

Cine
??? ??? ??????
Go? ? ???? ????
github.com/devsisters/cine
? Actor model for Go (like erlang)
? All actor is identified by unique PID
? Remote actor is treated same as local one
? Supports synchronous / asynchronous function call
Cine
Host 1 Host 2 Host 3
Actor Actor Actor Actor Actor
57

Cine
??? ??? ??????
Go? ? ???? ????
github.com/devsisters/cine
type Phonebook struct {
cine.Actor
book map[string]int
}
cine.Init("127.0.0.1:8000")
phonebook := Phonebook{cine.Actor{}, make(map[string]int)}
pid := cine.StartActor(&phonebook)
// For asynchronous call (ignore all errors)
cine.Cast(pid, nil, (*Phonebook).Add, "Jane", 1234)
// For synchronous call
ret, _ := cine.Call(pid, (*Phonebook).Lookup, "Jane")
number := ret[0].(int)
58

GoQuic
??? ??? ??????
Go? ? ???? ????
github.com/devsisters/goquic
https://www.youtube.com/watch?v=hQZ-0mXFmk8
59

??? ??? ??????
Go? ? ???? ????
QUIC vs TCP+TLS+SPDY/HTTP2
? 0-RTT support
? Multiplexing without Head-of-line blocking
? Forward error correction
? Connection Migration
60

GoQuic
??? ??? ??????
Go? ? ???? ????
github.com/devsisters/goquic
Chromium
Extract QUIC core devsisters/
libquic
Go binding w/ cgo devsisters/
goquic
devsisters.github.io/goquic
// server
goquic.ListenAndServe(":8080", 1, nil)
// client
client := &http.Client{
Transport: goquic.NewRoundTripper(false),
}
resp, err := client.Get("http://example.com/")
61

Q. ??? Go? ? ????? ?? ????
???��?
Go? ? ???? ???? 63

Q. ??? Go? ? ????? ?? ????
???��?
Go? ? ???? ????
A. ???? ??? ???? ?????????
????? ????? ?? ?
?, ???? ?? ???
?? ??? ??? ??? ?
64

Q. ??? ???2 ?? ????
???��?
Go? ? ???? ???? 65

Q. ??? ???2 ?? ????
???��?
Go? ? ???? ????
A. ????? (??)
66

Q. ??? Go ??? ????
???��?
Go? ? ???? ???? 67

�ݺ�ߣ

Go? ? ???? ????

More Related Content

Go? ? ???? ????