golang_hikaru.pdf

Transcript

1. How to create a Web application for Golang @yosuke_furukawa
2. @yosuke_furukawa Node.jsϢʔβʔάϧʔϓ୅ද / DeNAॴଐ
3. Golangྺɿ2ϲ݄͘Β͍ ࡞ͬͨ΋ͷ ! - socket.io-go-emitter - golang + angularjs Ͱ chat sample - qiita ΞυϕϯτΧϨϯμʔΛεΫϨΠϐϯά͢ Δπʔϧ
4. WebΞϓϦͷ࡞Γํ
5. WebΞϓϦͷ࡞Γํ net/httpͰͷwebαʔόͷݐͯํ DBΞΫηε/ORM Web Application Framework
6. golangͷษڧձΛ༗ࢤͷ਺໊ ूΊͯDeNAͰ΍ͬͯͨ
7. golangͷษڧձΛDeNAͰ ΍ͬͯͨ
8. ࠓճͷ࿩͸ͦͷ·ͱΊ
9. GoͰweb applicationΛ ࡞Δ࣌ʹ஌͓͍ͬͯͨํ͕ ྑ͍͜ͱ
10. net/httpͰWebαʔόΛͨͯͯΈΔ IUUQTHJTUHJUIVCDPNZPTVLFGVSVLBXB
11. net/httpͰWebαʔόΛͨͯΔ package main ! import ( "fmt" "net/http" "log" ) ! func hello(w http.ResponseWriter, r *http.Request) { //fmt.FprintfͰwʹೖΔ΋ͷ͕ΫϥΠΞϯτʹग़ྗ͞ΕΔ fmt.Fprintf(w, "Hello World!") } ! func main() { // ΞΫηεͷϧʔςΟϯάΛઃఆ͢Δ http.HandleFunc("/", hello) // portΛࢦఆͯ͠ىಈ err := http.ListenAndServe(":9090", nil) if err != nil { log.Fatal("ListenAndServe: ", err) } }
12. net/httpͰWebαʔόΛͨͯΔ package main ! import ( "fmt" "net/http" "log" ) ! func hello(w http.ResponseWriter, r *http.Request) { //fmt.FprintfͰwʹೖΔ΋ͷ͕ΫϥΠΞϯτʹग़ྗ͞ΕΔ fmt.Fprintf(w, "Hello World!") } ! func main() { // ΞΫηεͷϧʔςΟϯάΛઃఆ͢Δ http.HandleFunc("/", hello) // portΛࢦఆͯ͠ىಈ err := http.ListenAndServe(":9090", nil) if err != nil { log.Fatal("ListenAndServe: ", err) } } )BOEMF'VODͰSPVUJOH -JTUFO"OE4FSWFͰQPSUΛࢦఆͯ͠ىಈ
13. ListenAndServeͷಈ͖ func (srv *Server) Serve(l net.Listener) error { defer l.Close() var tempDelay time.Duration // how long to sleep on accept failure for { rw, e := l.Accept() if e != nil { if ne, ok := e.(net.Error); ok && ne.Temporary() { if tempDelay == 0 { tempDelay = 5 * time.Millisecond } else { tempDelay *= 2 } if max := 1 * time.Second; tempDelay > max { tempDelay = max } log.Printf("http: Accept error: %v; retrying in %v", e, tempDelay) time.Sleep(tempDelay) continue } return e } tempDelay = 0 c, err := srv.newConn(rw) if err != nil { continue } go c.serve() } }
14. ListenAndServeͷಈ͖ func (srv *Server) Serve(l net.Listener) error { defer l.Close() var tempDelay time.Duration // how long to sleep on accept failure for { rw, e := l.Accept() if e != nil { if ne, ok := e.(net.Error); ok && ne.Temporary() { if tempDelay == 0 { tempDelay = 5 * time.Millisecond } else { tempDelay *= 2 } if max := 1 * time.Second; tempDelay > max { tempDelay = max } log.Printf("http: Accept error: %v; retrying in %v", e, tempDelay) time.Sleep(tempDelay) continue } return e } tempDelay = 0 c, err := srv.newConn(rw) if err != nil { continue } go c.serve() } } ϦεφʔΛ௨ͯ͡ϦΫΤετΛड͚औΔ ৽͘͠ίωΫγϣϯͷJOTUBODFΛ࡞Δ HPSPVUJOFΛىಈ͠ɺϦΫΤετΛॲཧ
    Ϣʔβʔ͔ΒͷϦΫΤετ͸શͯ৽͍͠HPSPVUJOF
    ͰߦΘΕɺޓ͍ʹӨڹ͠ͳ͍࡞Γʹͳ͍ͬͯΔ
15. GoͰRESTFul APIΛ࡞Δ
16. RESTFul API͓͞Β͍ ֤URI͕ϦιʔεΛද͢ ͜ͷϦιʔεΛૢ࡞͢ΔͨΊ4ͭͷ HTTPͷϝιουΛѻ͏
17. RESTFul API͓͞Β͍ VTFSTJE ϢʔβʔΛදݱ͢ΔͨΊͷϦιʔε (&5
    1045
    165
    %&-&5& )551
    NFUIPEΛ࢖ͬͯૢ࡞͢Δ
18. RESTFul APIΛ࡞Δ package main ! import ( "fmt" "github.com/drone/routes" "net/http" ) ! // GET༻ͷHandler func getuser(w http.ResponseWriter, r *http.Request) { params := r.URL.Query() id := params.Get(":id") fmt.Fprintf(w, "you are get user %s", id) } // PUT, DELETE, POST༻ͷ… ! func main() { mux := routes.New() // GET, PUT, DELETE, POST ༻ͷϋϯυϥʔؔ਺Λrouting͢Δ mux.Get("/users/:id", getuser) mux.Put("/users/:id", modifyuser) mux.Del("/users/:id", deleteuser) mux.Post("/users/", adduser) http.Handle("/", mux) http.ListenAndServe(":9090", nil) }
19. RESTFul APIΛ࡞Δ package main ! import ( "fmt" "github.com/drone/routes" "net/http" ) ! // GET༻ͷHandler func getuser(w http.ResponseWriter, r *http.Request) { params := r.URL.Query() id := params.Get(":id") fmt.Fprintf(w, "you are get user %s", id) } // PUT, DELETE, POST༻ͷ… ! func main() { mux := routes.New() // GET, PUT, DELETE, POST ༻ͷϋϯυϥʔؔ਺Λrouting͢Δ mux.Get("/users/:id", getuser) mux.Put("/users/:id", modifyuser) mux.Del("/users/:id", deleteuser) mux.Post("/users/", adduser) http.Handle("/", mux) http.ListenAndServe(":9090", nil) } ESPOFSPVUFTͱ͔HPXFCͱ͔ͷ
    ϧʔςΟϯά༻ͷ
    SE
    NPEVMFTΛ࢖͏ େͨ͜͠ͱ͸΍ͬͯͳ͍ͷͰɺ
    OFUIUUQ͚ͩͰؤுΔࣄ΋Մೳ͕ͩɺ
    JE͔Β࢝·Δจࣈͷύʔεͱ
    NFUIPEʹΑΔSPVUJOHॲཧ͕໘౗ͳΒ
    ͜͏͍͏Ϟδϡʔϧ࢖͏ͷ΋͋Γɻ
    
20. ͜Ε͚ͩͰ؆୯ͳREST API͸࡞ΕΔ
21. DBΞΫηε IUUQTHJTUHJUIVCDPNZPTVLFGVSVLBXB
22. DBΞΫηε package main ! import ( "database/sql" _ "github.com/go-sql-driver/mysql" "log" ) ! func main() { ɹɹ// sql.Open ୈҰҾ਺ʹdriverͷछྨɺୈೋҾ਺ʹ઀ଓΞυϨεΛࢦఆɺ͜͜Ͱ͸hello ʹ઀ଓ͢Δ͜ͱΛએݴɻ db, err := sql.Open("mysql", "root@tcp(127.0.0.1:3306)/hello") // err͕͋Ε͹ͦΕΛදࣔ if err != nil { log.Fatal(err) } // deferͰؔ਺ͷऴΘΓʹͦΕΛclose defer db.Close() }
23. DBΞΫηε package main ! import ( "database/sql" _ "github.com/go-sql-driver/mysql" "log" ) ! func main() { ɹɹ// sql.Open ୈҰҾ਺ʹdriverͷछྨɺୈೋҾ਺ʹ઀ଓΞυϨεΛࢦఆɺ͜͜Ͱ͸hello ʹ઀ଓ͢Δ͜ͱΛએݴɻ db, err := sql.Open("mysql", "root@tcp(127.0.0.1:3306)/hello") // err͕͋Ε͹ͦΕΛදࣔ if err != nil { log.Fatal(err) } // deferͰؔ਺ͷऴΘΓʹͦΕΛclose defer db.Close() } TRM0QFOͰ%#ΞΫηε։࢝
24. SELECTૢ࡞ var ( id int name string ) // db.PrepareͰPreparedStatement࣮ߦ stmt, err := db.Prepare("select id, name from users where id = ?") if err != nil { log.Fatal(err) } // statementͷClose๨Εͣʹɻ defer stmt.Close() // stmt.QueryͰQueryΛ࣮ߦ rows, err := stmt.Query(1); for rows.Next() { err := rows.Scan(&id, &name) if err != nil { log.Fatal(err) } log.Println(id, name) } defer rows.Close();
25. SELECTૢ࡞ var ( id int name string ) // db.PrepareͰPreparedStatement࣮ߦ stmt, err := db.Prepare("select id, name from users where id = ?") if err != nil { log.Fatal(err) } // statementͷClose๨Εͣʹɻ defer stmt.Close() // stmt.QueryͰQueryΛ࣮ߦ rows, err := stmt.Query(1); for rows.Next() { err := rows.Scan(&id, &name) if err != nil { log.Fatal(err) } log.Println(id, name) } defer rows.Close(); EC1SFQBSFͰ42-࣮ߦ͢Δ TUNU2VFSZͰ2VFSZΛ࣮ߦ
    ͜͜Ͱ͸ɺJEΛ࣮ߦ
26. INSERTͱ͔UPDATEͱ͔DELETEͱ͔ ! stmt, err := db.Prepare("INSERT INTO users(id, name) VALUES(?, ?)") if err != nil { log.Fatal(err) } res, err := stmt.Exec(2, "haruyama") if err != nil { log.Fatal(err) }
27. INSERTͱ͔UPDATEͱ͔DELETEͱ͔ ! stmt, err := db.Prepare("INSERT INTO users(id, name) VALUES(?, ?)") if err != nil { log.Fatal(err) } res, err := stmt.Exec(2, "gopher") if err != nil { log.Fatal(err) } TUNU&YFDͰߋ৽ܥͷ2VFSZΛൃߦ͢Δ
28. ͜͜·ͰͰ؆୯ͳDBΞΫηεͱӬଓԽ͸Ͱ͖Δ
29. ORM
30. ͜Μ͚ͩ͋Δ…
31. ͋Μ·Γࢼͤͯͳ͍… γϯϓϧͰquery builderͬΆ͍gorp͔ gorm͕ྑͦ͞͏͚ͩͲɺAPIతʹ͸ ͲΕ΋༗ҙࠩ͸ͳ͍
32. Web Application Frameworks IUUQTHJTUHJUIVCDPNZPTVLFGVSVLBXB
33. TL;DR OFUIUUQ NBSUJOJ
    CFFHP SFWFM
    GBMDPSF HPXFC
    
    ESPOFSPVUFT HPSJMMBOFHSPOJ OFFE
    TJNQMF 3&45
    'SBNFXPSL UPPMLJUDPNQBUJCMF
    XJUI
    OFUIUUQ 4JOBUSB&YQSFTT
    MJLF 'VMMTUBDL
    3P3
    MJLF
34. martini ! • ϑϧελοΫϑϨʔϜϫʔΫ • martini͕sinatraͳΒͬͪ͜͸RoR, Play FrameworkɺͪͳΈʹॳظϖʔδ͘͢͝PlayͬΆ͍ • தʹmail sender΍websocket΋૊Έࠐ·ΕͯΔ • ϛυϧ΢ΣΞ΋ϑΟϧλʔͱ͍͏֓೦Λ࢖͏͜ͱͰ࢖ ͑Δ • ίʔυมߋΛݕ஌ͯࣗ͠ಈϦϩʔυ/ςετϑϨʔϜ ϫʔΫ͕தʹ͋ΔɺͳͲ։ൃʹ΋ศར
35. Falcore • զΒ͕ngmoco੡ɺ࠷ۙ͸ϝϯςΛfitstar͞Μʹ ৡ͍ͬͯΔ༷ࢠ • ϑϧελοΫϑϨʔϜϫʔΫ • HUPΛૹͬͨΒࣗಈͰprocessΛforkͯ͠ࢠϓϩ ηε͕readyʹͳͬͨΒࣗ෼Λࡴ͢ಈ͖Λ͢Δ • ͜ΕʹΑΓɺhot restart͕Մೳʹͳ͍ͬͯΔ
36. beego • revel΄ͲߴػೳͰ͸ͳ͍͕ɺҰԠϑϧελοΫϑϨʔϜϫʔΫ • υΩϡϝϯτ͕௒਌੾ • beego/ORMΛαϙʔτ͠ɺMVCʹ
 ಛԽ͍ͯ͠Δ • தࠃͰ͸࠾༻࣮੷͋Γ? ! ! ! ! !
37. martini ! ! • ਓؾ͕͋Δ(github/starతͳҙຯͰ) • ͘͢͝Sinatra/ExpressϥΠΫ • جຊతͳػೳ͔͠ίΞʹ͸ଘࡏͤͣɺϛυϧ ΢ΣΞͰػೳ֦ு͢Δ • ๛෋ͳϛυϧ΢ΣΞ͕ଘࡏ͍ͯ͠Δɻ • ͨͩ͠ɺ࡞ऀ͸͋Μ·Γਪͯ͠ͳ͍ɻ
38. martini ! ! • Martiniͷ࡞ऀ͕HTTP serverΛΑΓ؆қతʹɺΠσΟ ΦϜతʹѻ͑ΔΑ͏ʹ͢ΔͨΊʹ։ൃͨ͠ϥΠϒϥϦ • ਖ਼֬ʹ͸ϑϨʔϜϫʔΫͰ͸ͳ͘ɺϥΠϒϥϦ܈ • ࠓޙMartiniͷ୅ΘΓʹελϯμʔυʹͳΔՄೳੑ͕͋ Δ͔΋ɻ ! !
39. martini ! ! • ͪ͜Β΋ਖ਼֬ʹ͸πʔϧΩοτ • router, secure session, websocket౳ɺ·͊WebΞϓϦ࡞ Δʹ͸࢖͏ΑͶ͍ͬͯ͏ͷ͕ἧͬͯΔɻ • isucon ͍ͬͯ͏web ΞϓϦߴ଎Խνϡʔχϯάίϯςετ Ͱ࢖ΘΕͯΔɻ • ଞʹ΋࣮͸revelͷதͰ࢖ΘΕͯͨΓͱ൚༻ੑߴ͍ɻ !
40. WAF·ͱΊ OFUIUUQ NBSUJOJ
    CFFHP SFWFM
    GBMDPSF HPXFC
    
    ESPOFSPVUFT HPSJMMBOFHSPOJ OFFE
    TJNQMF 3&45
    'SBNFXPSL UPPMLJUDPNQBUJCMF
    XJUI
    OFUIUUQ 4JOBUSB&YQSFTT
    MJLF 'VMMTUBDL
    3P3
    MJLF
41. ·ͱΊ • Webαʔόͷݐͯํͱnet/httpͷ
 جૅతͳ࿩ • DBΞΫηεͷํ๏ • Web Application Framework
 ·ͱΊ
42. ࠓޙ΍Γ͍ͨࣄ
43. ࠓޙ΍Γ͍ͨࣄ (P
    
    TPDLFUJP
    Ͱࢮ͵༧ఆ