sendmailのラッパーをGo言語で作ってみた話

Transcript

1. ໦ଜ޿ւ
   
   (.0
   1FQBCP
   *OD
   
   ϗεςΟϯάࣄۀ෦
   5FDI
   .5(
   TFOENBJMͷϥούʔΛ
   (PݴޠͰ࡞ͬͯΈͨ࿩

2. ΤϯδχΞ ໦ଜ޿ւ
   
   !LJNSPNJ ϗεςΟϯάࣄۀ෦
   ϜʔϜʔυϝΠϯνʔϜ

3. ຖि༵͓ۚனͷ
   (P
   -VODI

4. ͳΜ͔ॻ͍ͯΈ͍ͨͳ͊

5. None

6. ॻ͍ͯΈͨʂ

7. TFOENBJMMPHHFS IUUQTHJUIVCDPNLJNSPNJTFOENBJMMPHHFS ͍ͨͩ·W

8. TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJM Ϣʔβʔ ɾϢʔβʔొ࿥
   ɾυϝΠϯऔಘɺߋ৽
   ɾظݶ੾ΕؒۙͷҊ಺
   ɹɹɹɹɹɹͳͲͷϝʔϧ

9. TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJMMPHHFS Ϣʔβʔ ɾϢʔβʔొ࿥
   ɾυϝΠϯऔಘɺߋ৽
   ɾظݶ੾ΕؒۙͷҊ಺
   ɹɹɹɹɹɹͳͲͷϝʔϧ

   TFOENBJM NBJM
   MPH

10. TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJMMPHHFS Ϣʔβʔ ɾϢʔβʔొ࿥
    ɾυϝΠϯऔಘɺߋ৽
    ɾظݶ੾ΕؒۙͷҊ಺
    ɹɹɹɹɹɹͳͲͷϝʔϧ

    TFOENBJM NBJM
    MPH UBJM

11. Ͳ͏͍͍ͷʁ w ސ٬؅ཧ͔Βϝʔϧૹ৴ঢ়گΛӾཡͰ͖Δ ظݶ੾Εલʹϝʔϧ͕͜ͳ͔ͬͨΜͰ͚͢ͲʂʁʹରԠ͠΍͍͢ w ֬ೝ༻ͷϝʔϧΞυϨε΁ͷϝʔϧૹ৴͕ෆཁʹ Ϣʔβʔ΁̍௨ɺ֬ೝ༻ϝʔϧΞυϨε΁̍௨ͷ̎௨ૹ৴͍ͯ͠Δɾɾ

12. Πϯετʔϧ logfile: /var/log/sendmail.log $ wget -O /usr/local/bin/sendmail-logger https:// github.com/kimromi/sendmail-logger/releases/download/ v0.0.2/sendmail-logger_linux_amd64

    $ chmod 755 /usr/local/bin/sendmail-logger ઃఆϑΝΠϧ
    
    FUDTFOENBJMMPHHFSDPOpHZBNM ྫ
    $FOU04
    CJU όΠφϦΛ(JUIVCʹஔ͍͍ͯΔͷͰ
    04ʹ͋ͬͨ΋ͷΛμ΢ϯϩʔυ͢Δ͚ͩ

13. ઃఆํ๏ 1)1 sendmail_path = /usr/sbin/sendmail -t -i sendmail_path = /usr/local/bin/sendmail-logger

    QIQJOJ sendmail_path = sendmail-logger # path௨ͬͯΕ͹

14. ઃఆํ๏ 3VCZ
    
    "DUJWF.BJMFS
    PO
    3BJMT Rails.application.configure do .. config.action_mailer.delivery_method = :sendmail config.action_mailer.sendmail_settings =

    { location: "/usr/local/bin/sendmail-logger" } end DPOpHFOWJSPONFOUT3"*-4@&/7SC

15. ࣮૷͔Β഑෍·ͰͷಓͷΓ w ࣮૷
    w ΫϩείϯύΠϧ
    w όΠφϦ഑෍ ҙ֎ͱ͢ΜͳΓ͍͚ͨΫϚʔ

16. ࣮૷ 1.

17. TFOENBJMMPHHFSͰ΍͍ͬͯΔ͜ͱ w ࣮ߦϩάग़ྗ
    w ඪ४ೖྗಡΈࠐΈ
    w ZBNMϑΝΠϧಡΈࠐΈ
    w ϝʔϧϩάϑΝΠϧग़ྗ
    w

    TFOENBJMίϚϯυ࣮ߦ

18. ࣮ߦϩάग़ྗ w MPH
    
    (Pඪ४ͷMPHϥΠϒϥϦ package main import ( "log" "os" )

    func init() { f, _ := os.OpenFile("out.log", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666) log.SetOutput(f) } func main() { log.Print("loglog") } ¥ 3FBE
    BOE
    8SJUF ϑΝΠϧͳ͔ͬͨΒ࡞Δ ຤ඌʹςΩετ௥Ճ

19. ඪ४ೖྗಡΈࠐΈ w CVpP
    
    (Pඪ४ͷ*0όοϑΝϦϯά package main import ( "bufio" "fmt" "os"

    ) func main() { body := "" scanner := bufio.NewScanner(os.Stdin) for scanner.Scan() { body += scanner.Text() + "\n" } if err := scanner.Err(); err != nil { fmt.Print(err) } } ෳ਺ߦͷೖྗ͕͋Δͱ͖͸
    GPS
    Ͱશߦऔಘ͢Δ

20. ZBNMϑΝΠϧಡΈࠐΈ w HPZBNMZBNM
    
    ZBNMಡΈࠐΈϥΠϒϥϦ IUUQTHJUIVCDPNHPZBNMZBNM package main import ( "fmt" "io/ioutil"

    yaml "gopkg.in/yaml.v2" ) type Config struct { LogFile string `yaml:"logfile"` } func main() { file, _ := ioutil.ReadFile("/etc/sendmail-logger/config.yaml") conf := Config{} yaml.Unmarshal([]byte(file), &conf) fmt.Print(conf) } ZBNMϑΝΠϧͰͷઃఆ໊Λ
    TUSVDUͰఆ͓ٛͯ͘͠

21. ϝʔϧϩάϑΝΠϧग़ྗ package main import ( "fmt" "os" ) func main()

    { file, err := os.OpenFile("mail.log", os.O_WRONLY | os.O_CREATE | os.O_APPEND, 0664) if err != nil { fmt.Print(err) } defer file.Close() file.Write(([]byte)("write")) } w PT
    
    (Pඪ४ͷ04ػೳ΁ͷΠϯλʔϑΣʔεύοέʔδ 8SJUF
    0OMZ EFGFSͰ࣮ߦ׬ྃ࣌ʹ
    ϑΝΠϧΫϩʔζ͢Δ

22. TFOENBJMίϚϯυ࣮ߦ w PTFYFD
    
    (Pඪ४ͷ֎෦ίϚϯυ࣮ߦύοέʔδ package main import ( "fmt" "os/exec" )

    func main() { out, err := exec.Command("ls", "-la").Output() if err != nil { fmt.Print(err) } fmt.Print(string(out)) } ίϚϯυ࣮ߦͭͭ͠
    ඪ४ग़ྗΛม਺ʹऔΓࠐΉ

23. ΫϩείϯύΠϧ 2.

24. HPY w ΫϩείϯύΠϧ༻ͷύοέʔδ $ go get github.com/mitchellh/gox $ gox Number

    of parallel builds: 3 --> linux/arm: _/Users/PMAC243S/repos/github.com/kimromi/sendmail-logger --> darwin/386: _/Users/PMAC243S/repos/github.com/kimromi/sendmail-logger --> linux/386: _/Users/PMAC243S/repos/github.com/kimromi/sendmail-logger --> netbsd/arm: _/Users/PMAC243S/repos/github.com/kimromi/sendmail-logger ɾɾɾ IUUQTHJUIVCDPNNJUDIFMMIHPY ίϚϯυൃͰ
    ֤04༻ͷόΠφϦΛ࡞੒ HP
    HFUͰΠϯετʔϧ

25. όΠφϦ഑෍ 3.

26. HIS w HJUIVCDPNʹWFSTJPO
    UBH෇͖ͰϦϦʔε IUUQTHJUIVCDPNUDOLTNHIS $ go get github.com/tcnksm/ghr $ gox

    -output "pkg/{{.Dir}}_{{.OS}}_{{.Arch}}" $ ghr v0.0.2 pkg/ WFSTJPO
    UBHΛ෇༩ͯ͠ϦϦʔε
    όΠφϦμ΢ϯϩʔυͰ͖Δ HP
    HFUͰΠϯετʔϧ

27. ͓ΘΓɻ؆୯ɻ

28. ͳΜ͔ॻ͍ͯΈ·͠ΐʂ
    ๻͕Ͱ͖͔ͨΒΈΜͳͰ͖Δ

29. ࠓޙ w ςετॻ͍ͯͳ͍ɾɾɾ
    w TNUQͷରԠͱ͔
    w qVFOUEͱ࿈ܞͯ͠5SFBTVSF%BUB΁ʢݕূதʣ
    w ސ٬؅ཧ͔Βϝʔϧ಺༰ΛݟΕΔΑ͏ʹ
    w

    ֬ೝ༻ϝʔϧΞυϨε΁ͷૹ৴Λ๾໓