GDG DevFest Kyoto 2014　これからのGoの話をしよう

1. GDG DevFest Kyoto 2014
䝷䜲䝣
䛣䜜䛛䜙䛾Go䛾ヰ䜢䛧䜘䛖
䜏䜣䛺䛾
GDG⚄ᡞ䚷㔝⏣ᝅᚿ

2. ⮬ᕫ⤂௓䛳䛶኱஦䛰䜘䛽
㔝⏣䛷䛩䚹 ௨ୖ

3. ⎔ቃ
OS
䚷Ubuntu14.04 x64 (VMware Player 6)
Go Version
䚷1.3.3䚷(୍㒊1.2.2)

4. 㛤Ⓨ⎔ቃ 䍦䚷Vim

5. ୓䛸ゝ䜟䛪ி䛾୍䛾ᛕ䛾ᛕ䛾ᛕ䛾䛯䜑
Vim䜲䞁䝇䝖䞊䝹
䚷$ sudo apt-get install vim
.profile䛻GOROOT䛸GOPATH䜢タᐃ
䚷export GOROOT=/usr/local/go
䚷export GOPATH=$HOME/go
䚷export PATH=$GOPATH/bin:$GOROOT/bin:$PATH
GOPATH䛿go get䛷䝷䜲䝤䝷䝸䛜᱁⣡䛥䜜䜛䝕䜱䝺䜽䝖䝸䚹㐺ᙜ䛷 OK
䛒䛸䚸䝋䞊䝇䝣䜯䜲䝹䛿 GOPATH௨ୗ䛾src䝕䜱䝺䜽䝖䝸䛻స䛳䛶䛔䛟䛸Ⰻ䛔䜘 (ᚋ䛷ㄝ᫂)

6. ୓䛸ゝ䜟䛪ி䛾୍䛾ᛕ䛾ᛕ䛾ᛕ䛾䛯䜑
git䛸hg䝁䝬䞁䝗䛜౑䛘䜛䜘䛖䛻䜲䞁䝇䝖䞊䝹
䚷$ sudo apt-get install git
䚷$ sudo apt-get install mercurial
Github䜔GoogleCode䛛䜙Ⰽ䚻ྲྀ䛳䛶䛟䜛䛛䜙

7. gocode
䜲䞁䝔䝸䝉䞁䝇䜢౑䛘䜛䜘䛖䛻䛺䜛
䚷$ go get -u github.com/nsf/gocode
Vim䛾ሙྜ䚸"."䛾ᚋ䛻<C-x><C-o>䛷⿵᏶䛥䜜䜛

8. go get䛩䜛䛸䚸GOPATH௨ୗ䛻bin䚸pkg䚸src䛜⮬ືⓗ䛻స䜙
䜜䜛
ᚲせ䛺䛔䝕䜱䝺䜽䝖䝸䛿స䜙䜜䛺䛔
⮬ศ䛷సᡂ䛧䛯䝋䞊䝇䜢go install䛧䛶䝟䝑䜿䞊䝆䜢స䜛ሙྜ䚸
GOPATH௨ୗ䛾src䛸ྠ㝵ᒙ䛻䛒䜛pkg䛻䝟䝑䜿䞊䝆䛜సᡂ䛥
䜜䜛
䛺䛾䛷䚸GOPATH௨ୗ䛾src䛻䝋䞊䝇䝣䜯䜲䝹స䛳䛶䛔䛟䛸Ⰻ䛔䜘䛳䛶ヰ

9. .vimrc (൅䛾䛿䛣䜣䛺ឤ䛨)
filetype off
filetype plugin off "indent off
set runtimepath+=$GOROOT/misc/vim
exe "set runtimepath+=".globpath($GOPATH, "src/github.com/nsf/gocode/vim")
set number "⾜␒ྕ䜢⾲♧
set tabstop=4 "䜲䞁䝕䞁䝖䜢䝇䝨䞊䝇4䛴ศ䛻タᐃ
set smartindent "ᨵ⾜᫬䛾䜸䞊䝖䜲䞁䝕䞁䝖
set completeopt=menuone "䝁䞊䝗⿵᏶᫬䛾䝥䝺䝡䝳䞊䜢↓ຠ䛻䛩䜛
set ignorecase "኱ᩥᏐ/ᑠᩥᏐ䛾༊ู䛺䛟᳨⣴䛩䜛
set incsearch "᳨⣴䝣䝺䞊䝈䛻㒊ศ䝬䝑䝏䛧䛶䛔䜛㒊ศ䜢⾲♧䛩䜛
set hlsearch "䝬䝑䝏䛩䜛䛩䜉䜢ᙉㄪ⾲♧䛩䜛
set smartcase "᳨⣴ᩥᏐิ䛻኱ᩥᏐ䛜ྵ䜎䜜䛶䛔䜛ሙྜ䛿༊ู䛧䛶᳨⣴䛩䜛
"䝞䝑䝣䜯䛾๓ᚋษ䜚᭰䛘
nmap <C-p> :bp<CR>
nmap <C-n> :bn<CR>
filetype plugin on "indent on

10. 䜽䝻䝇䝁䞁䝟䜲䝹

11. ᭱ึ䛻ᑐ㇟䛸䛺䜛䝥䝷䝑䝖䝣䜷䞊䝮䛾䜽䝻䝇䝁䞁䝟䜲䝹⎔ቃ䜢స
ᡂ䛩䜛ᚲせ䛜䛒䜛
GOOS䛻ᑐ㇟OS䚸GOARCH䛻ᑐ㇟䜰䞊䜻䝔䜽䝏䝱䜢ᣦᐃ
䚷$ cd $GOROOT/src
䚷$ sudo GOOS=windows GOARCH=amd64 ./make.bash
GOOS䛸GOARCH䛾⤌䜏ྜ䜟䛫䛿ୗグཧ↷
http://golang.org/doc/install/source

12. GOOS䚸GOARCH䜢ᣦᐃ䛧䛶go build䛩䜛䛸䚸ᑐ㇟䝥䝷䝑䝖
䝣䜷䞊䝮䛾ᐇ⾜䝣䜯䜲䝹䛜సᡂ䛥䜜䜛
䚷$ GOOS=windows GOARCH=amd64 go build sample.go

13. SQL

14. SQL Driver
SQL Driver䛾୍ぴ
https://code.google.com/p/go-wiki/
source/browse/SQLDrivers.wiki?repo=wiki
MyMySQL
https://github.com/ziutek/mymysql
MySQL䛿ධ䜜䛸䛔䛶䛽䟿௒ᅇ䛿 MySQL5.5䜢౑䛳䛶䜛䜘

15. MyMySQL䜢ྲྀ䛳䛶䛟䜛
䚷$ go get github.com/ziutek/mymysql/thrsafe
䚷$ go get github.com/ziutek/mymysql/autorc
䚷$ go get github.com/ziutek/mymysql/godrv

16. import䛻
䚷_ "github.com/ziutek/mymysql/thrsafe"
䜢ධ䜜䛶䛚䛟
import (
"fmt"
"github.com/ziutek/mymysql/mysql"
_ "github.com/ziutek/mymysql/thrsafe"
"os"
)

17. ┤᥋౑䛖䜟䛡䛨䜓䛺䛔䛡䛹䚸thrsafe.go䛾init㛵ᩘ䛜࿧䜀䜜䚸
DB᥋⥆䛾‽ഛ䜢䛩䜛
thrsafe䛿䝇䝺䝑䝗䝉䞊䝣䛺DB᥋⥆䛻䛺䜛
_ "github.com/ziutek/mymysql/native"
䜢thrsafe䛾௦䜟䜚䛻import䛧䛶䜒Ⰻ䛔
mysql.go䛾init㛵ᩘ䛜࿧䜀䜜䚸ྠ䛨䛟DB᥋⥆䛾‽ഛ䜢䛩䜛
thrsafe䛸䛾㐪䛔䛿䚸䛣䛳䛱䛿䝇䝺䝑䝗䜰䞁䝉䞊䝣䛺DB᥋⥆䛻䛺
䜛

18. DB᥋⥆᝟ሗ䜢సᡂ䛧䚸᥋⥆䛩䜛
➨஧ᘬᩘ䛿䝻䞊䜹䝹䜰䝗䝺䝇䚹➨୕ᘬᩘ䛜䝃䞊䝞䜰䝗䝺䝇
db := mysql.New("tcp", "", "127.0.0.1:3306", "sampleuser",
"samplepw", "sampledb")
db.Connect()

19. 㐜ᘏᐇ⾜䛷DB䜢㛢䛨䜘䛖䛻䛧䛶䛚䛟
defer func() {
db.Close()
}()

20. 䜽䜶䝸䜢ᐇ⾜䛩䜛䛻䛿Query䜢౑䛖
➨୍ᘬᩘ䛻䜽䜶䝸䚸➨஧ᘬᩘ䛻䝟䝷䝯䞊䝍(ྍኚ)䜢タᐃ䛩䜛
sqlstr := "INSERT INTO sample_table (name) VALUES
('test_%d')"
db.Query(sqlstr, 1)

21. SELECTᩥ䛾ᐇ⾜⤖ᯝ䛾䝬䝑䝢䞁䜾
sqlstr := "SELECT * FROM sample_table"
rows, res, _ := db.Query(sqlstr)
id := res.Map("id")
name := res.Map("name")

22. 䝺䝁䞊䝗䛿䛣䜣䛺ឤ䛨䛷ぢ䜜䜛
for _, row := range rows {
// ⤖ᯝ䜢1⾜䛪䛴⾲♧䛩䜛
fmt.Printf("| %d | %s |n", row.Int(id), row.Str(name))
}

23. 䝖䝷䞁䝄䜽䝅䝵䞁䛿䛣䜣䛺ឤ䛨
tr, err := db.Begin()
sqlstr := "UPDATE sample_table SET name='test'"
_, err = tr.Start(sqlstr)
䝁䝭䝑䝖䛿tr.Commit()䚸䝻䞊䝹䝞䝑䜽䛿tr.Rollback()䜢࿧䜆

24. OpenCV

25. OpenCV䜢䜲䞁䝇䝖䞊䝹
䚷$ sudo apt-get install ocl-icd-libopencl1
䚷$ sudo apt-get install libopencv-dev
1䛴┠䛾䜢䜲䞁䝇䝖䞊䝹䛧䛺䛔䛸䚸ḟᅇ䝻䜾䜲䞁᫬䛻 XWindow䛜䛣䛡䛶
䝻䜾䜲䞁䛷䛝䛺䛟䛺䜛䝞䜾䛜䛒䜛䛳䜍䛔
http://computationaldiary.blogspot.jp/2013/11/ubuntu-1310-opencv-245-apt-get.html

26. OpenCV䛜౑䛘䜛䜘䛖䛻䛩䜛(䝞䜲䞁䝕䜱䞁䜾䛧䛶䛟䜜䜛)
䚷$ go get github.com/lazywei/go-opencv
$GOPATH/src/github.com/lazywei/go-opencv/samples
䛻Ⰽ䚻䝃䞁䝥䝹ධ䛳䛶䜛䜘䚹

27. Demo

28. Gobot

29. Gobot
http://gobot.io/
Arduino䜔Sphero(2.0)䚸ARDrone䛺䛹11䛾䝥䝷䝑䝖䝣䜷䞊䝮䛻
ᑐᛂ
௒ᅇ䛿Arduino(Arduino UNO R3)䛷LED䜢ග䜙䛫䜛䜘

30. Firmata
Firmata(䝣䜵䝹䝬䞊䝍)䛸䛔䛖䝥䝻䝖䝁䝹䜢౑䛖
䜎䛪䛿Arduino UNO R3䛻Firmata䜢᭩䛝㎸䜐
Arduino UNO R3䜢᥋⥆䛧䚸ArduinoIDE䛛䜙䚸
File -> Examples -> Firmata -> StandardFirmata
䜢㛤䛔䛶䚸Upload
ArduinoIDE
http://arduino.cc/en/main/software

31. Gobot䜢ྲྀ䛳䛶䛝䛶䚸ྛ䝟䝑䜿䞊䝆䜢⏝ព䛩䜛
䚷$ go get -u github.com/hybridgroup/gobot
䚷$ go install github.com/hybridgroup/gobot/platforms/firmata
䚷$ go install github.com/hybridgroup/gobot/platforms/gpio
䝅䝸䜰䝹㏻ಙ䛜ฟ᮶䜛䜘䛖䛻goserial䜒ධ䜜䜛
䚷$ go get -u github.com/tarm/goserial
Gobot䛾䝞䞊䝆䝵䞁☜ㄆ䛿ୗグ䛷ฟ᮶䜛䜘䛖䛻䛺䜛䜘
䚷$ go get -u github.com/hybridgroup/gobot/gobot
䚷$ gobot -v

32. gobot/examples䛾ୗ䛾firmata_blink.go
䝫䞊䝖␒ྕ䛺䛹㐺ᐅኚ᭦
firmataAdaptor := firmata.NewFirmataAdaptor("arduino",
"/dev/ttyACM0")
led := gpio.NewLedDriver(firmataAdaptor, "led", "7")

33. Demo

34. ぢ䛶䜏䜝䜘䚸LEDග䛳䛶䜛䛰䜝䠛
䛣䜜䚸Go䛷ື䛔䛶䜛䜣䛰䛬䟿

35. ೵Ṇ䛩䜛䛻䛿Ctrl+C
䜒䛧䛂open /dev/ttyACM0: "Permission denied"䛃䛸ฟ䜛ሙྜ
$ sudo chown (䝴䞊䝄ྡ) /dev/ttyACM0

36. GoAndroid

37. GoAndroid
Android䛻䛿JNI䛸䛔䛖䝛䜲䝔䜱䝤ゝㄒ䜢Java⤒⏤䛷ᐇ⾜䛩䜛௙
⤌䜏䛜䛒䜛
Go䜢JNI䛷ᐇ⾜䛷䛝䜛䜘䛖䛻䛧䛯䛾䛜GoAndroid䛸䛔䛖䝟䝑䝏
䝟䝑䝏䛺䛾䛷Go䝋䞊䝇䛛䜙䝡䝹䝗䛩䜛ᚲせ䛜䛒䜛䜘

38. 䜎䛪䛿Android SDK䛸䛛JDK䛸䛛䜒䜝䜒䜝ྲྀ䛳䛶䛟䜛
Android SDK
http://developer.android.com/sdk/index.html
SDK䛰䛡䛷䛔䛔䛺䜙䚸䛂 VIEW ALL DOWNLOADS AND SIZES䛃->䛂SDK Tools Only䛃䛛䜙
㐺ᙜ䛺䛸䛣䜝䛻ᒎ㛤䛧䛶.profile䛻ୗグ䜢㏣ຍ
export ANDROID_HOME=$HOME/android-sdk-linux

39. JDK䚸ant䚸adb䜢ධ䜜䜛
䚷$ sudo apt-get install openjdk-7-jdk
䚷$ sudo apt-get install ant
䚷$ sudo apt-get install android-tools-adb
ヨ䛧䛻➃ᮎ䛜ㄆ㆑䛥䜜䜛䛛☜ㄆ䛧䛶䛚䛟䚹䜒䛧ㄆ㆑䛥䜜䛶䛔䛺䛔ሙྜ䛿 rules䝣䜯䜲䝹䜢సᡂ䛧䛶䛽
䚷$ adb devices
SDKManager䜢㉳ື䛧䚸➃ᮎ䛾API䝺䝧䝹䛻ྜ䜟䛫䛶䚸
䜲䞁䝇䝖䞊䝹
䚷$ $ANDROID_HOME/tools/android

40. JNI䜢฼⏝䛩䜛䛻䛿Android NDK䛜ᚲせ
https://developer.android.com/intl/ja/tools/sdk/ndk/index.html
ᒎ㛤䛩䜛
䚷$ chmod a+x android-ndk-r10c-linux-x86_64.bin
䚷$ ./android-ndk-r10c-linux-x86_64.bin
Linux䛾x86䛿ၥ㢟䛺䛛䛳䛯䜣䛰䛡䛹䚸 x64䛾᪉䛿඲↛ᒎ㛤䛥䜜䛺䛔 …
䛷䚸ㄪ䜉䛶䜏䛯䜙 Issue䛻䛿ୖ䛜䛳䛶䛯 ( https://code.google.com/p/android/issues/detail?id=78148 )
௨ୗ䜢ᐇ⾜䛧䛶ᒎ㛤䛩䜜䜀 OK䜏䛯䛔
䚷$ sudo dpkg --add-architecture i386
䚷$ sudo apt-get update
䚷$ sudo apt-get install libstdc++6:i386

41. 㐺⏝䛺䛸䛣䜝䛻ᒎ㛤䛧䛶.profile䛻ୗグ䜢㏣ຍ
export NDK=$HOME/android-ndk
䝞䞊䝆䝵䞁㑧㨱䛰䛳䛯䛾䛷 android-ndk䛻䝸䝛䞊䝮䛧䛶䜛䜘

42. NDKToolchain䜢సᡂ䛩䜛
Androidྥ䛡䝷䜲䝤䝷䝸䜢స䜛᫬䛻౑䛖䜏䛯䛔
$ $NDK/build/tools/make-standalone-toolchain.sh --
toolchain=arm-linux-androideabi-4.9 --platform=android-18
--install-dir=ndk-toolchain

43. 䞉toolchain
䚷ᑐ㇟➃ᮎ䛾䜰䞊䜻䝔䜽䝏䝱タᐃ
䚷䛂arm-linux-androideabi-4.x䛃䛿ARM➃ᮎ
䚷䛂x86-4.x䛃䛿x86➃ᮎ
䚷䛂mipsel-linux-android-4.x䛃䛿MIPS➃ᮎ
䚷
䞉platform
䚷ᑐ㇟➃ᮎ䛾API䝺䝧䝹䛾タᐃ
䚷䚷௒ᅇ䛿Nexus7(2013)䛻ධ䜜䜘䛖䛸ᛮ䛳䛶䜛䛾䛷䚸䛸䜚䛒䛘䛪 18

44. 䞉install-dir
䚷NDKToolchain䛾సᡂඛ䝕䜱䝺䜽䝖䝸
ndk-toolchain䝕䜱䝺䜽䝖䝸䛜సᡂ䛥䜜䛯䜙䚸NDK_ROOT䜢タᐃ
䛧䛶䛚䛟
export NDK_ROOT=$HOME/ndk-toolchain

45. GoAndroid
https://github.com/eliasnaur/goandroid
ARMv7௨㝆䛾CPU䛻ᑐᛂ䛧䛶䛔䜛
Go1.2䛻ᑐᛂ䚹Go1.3䛿䝃䝫䞊䝖ᑐ㇟እ
䛘䞊䛳䛶ឤ䛨䛰䛡䛹䚸䛭䜜䛻䛴䛔䛶䛿ᚋ㏙

46. 䛸䜚䛒䛘䛪௒ᅇ䛿Go䝋䞊䝇䛿1.2.2䜢ྲྀ䛳䛶䛟䜛
䚷$ hg clone -u go1.2.2 https://code.google.com/p/go
᪤䛻ྲྀᚓ῭䜏䛷 1.2.2䛷䛺䛔䛺䜙䝤䝷䞁䝏䜢ษ䜚᭰䛘䜛
䚷$ hg update -C release-branch.go1.2
1.2.2䛾᪉䛻$GOROOT䜢タᐃ䛩䜛

47. GoAndroid䜢ྲྀ䛳䛶䛟䜛
䚷$ git clone https://github.com/eliasnaur/goandroid.git
goandroid䝕䜱䝺䜽䝖䝸䛻⛣ື䛧䚸patches䝕䜱䝺䜽䝖䝸
䜢$GOROOT௨ୗ䜈䝁䝢䞊䛩䜛
䚷$ cp -a patches $GOROOT/.hg

48. $GOROOT/.hg/hgrc䛻ୗグ䜢㏣グ䛩䜛
username䛿㐺ᙜ䛻ኚ䛘䜛䛸䛔䛔䜘
[extensions]
mq =
codereview = !
[ui]
username = name<sample@mail.com>

49. 䝟䝑䝏䜢䛒䛶䜛
䚷$ cd $GOROOT/src
䚷$ hg qpush -a
䝡䝹䝗䛩䜛
䚷$ CGO_ENABLED=0 GOOS=linux GOARCH=arm ./make.bash
CC="$NDK_ROOT/bin/arm-linux-androideabi-gcc" GOOS=linux
GOARCH=arm GOARM=7 CGO_ENABLED=1
$GOROOT/bin/go install -tags android -a -v std

50. 䝃䞁䝥䝹䜢ᐇ⾜䛧䛶䜏䜛
goandroid/hello-gl2/䜈⛣ື
build.sh䜢㛤䛝䚸
$GOANDROID/bin/go
䜢
$GOROOT/bin/go
䛻᭩䛝᥮䛘䜛

51. 䝡䝹䝗ᐇ⾜
䚷$ ./build.sh
android䝕䜱䝺䜽䝖䝸䛾project.properties䜢㛤䛝䚸
౑⏝䛩䜛API䝞䞊䝆䝵䞁䛻᭩䛝᥮䛘
൅䛾Nexus7(2013)䛾ሙྜ䚸target=android-18䛸䛩䜛

52. ➃ᮎ䜢PC䛻⧅䛞䚸䜲䞁䝇䝖䞊䝹
䚷$ ant -f android/build.xml clean debug install
䛂BUILD SUCCESSFUL䛃
䛸ฟຊ䛥䜜䛶䛔䜜䜀ᡂຌ
➃ᮎ䛻䛂Go GL2!䛃䛸䛔䛖䜰䝥䝸䛜䛒䜛䛿䛪

53. Demo

54. ぢ䛶䜏䜝䜘
䛣䜜䚸Go䛷ື䛔䛶䜛䜣䛰䛬䟿

55. 䜒䛧
䛂error while loading shared libraries: libz.so.1: cannot open
shared object file: No such file or directory䛃
䛾䜶䝷䞊䛷ኻᩋ䛧䛯ሙྜ(䛚䛭䜙䛟x64䛾ሙྜ䛾䜏)
䚷$ sudo apt-get install lib32z1
䛷䚸䜒䛖୍ᗘ䜲䞁䝇䝖䞊䝹ᐇ⾜

56. 䛱䜗䛳䛸䛰䛡
䛣䜜䛛䜙䛾Go䜢⪃䛘䛶䜏䜛

57. GoAndroid䛷䛿䚸Go1.3䛿䝃䝫䞊䝖ᑐ㇟እ
䛺䚸䛺䜣䛰䛳䛶䞊䟿䛳䛶ឤ䛨䛰䛡䛹䚸䛹䛖䜔䜙䚸Go1.4䛻ྥ䛡䛶
‽ഛ䛧䛶䛔䜛䜏䛯䛔
შ䛷䛿䚸GoAndroid䜢⤌䜏㎸䜣䛷䚸Go1.4䛛䜙GOOS䛻
android䛜㏣ຍ䛥䜜䜛䛛䜒䟿
http://www.infoq.com/jp/news/2014/07/golang-google-android-native-dev
䛒䛸Gobot䜒䛒䜛䛧
䛴䛔䛻 PhysicalGo 䛾᫬௦䛛䟿䠛

58. 䛣䜜䛛䜙䜒⇕䛔䛬䟿
golang䟿

59. 䛤Ύ⫈
䛒䜚䛜䛸䛖䛤䛦䛔䜎䛧䛯

60. 䛚䜎䛡
GopherCon2014
http://confreaks.com/events/gophercon2014
௒ᖺ䛾᫓䛤䜝䛻䜔䛳䛶䛯䚸Go䛾䜲䝧䞁䝖䛾ື⏬
௒ᅇ䛾Gobot䛿䛣䛣䛛䜙ぢ䛴䛡䛶䛝䛯䜘