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sendmailのラッパーをGo言語で作ってみた話
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Hiromi Kimura
December 15, 2016
Technology
1
2.1k
sendmailのラッパーをGo言語で作ってみた話
Hiromi Kimura
December 15, 2016
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Transcript
ଜւ(.01FQBCP *OD ϗεςΟϯάࣄۀ෦5FDI.5( TFOENBJMͷϥούʔΛ (PݴޠͰ࡞ͬͯΈͨ
ΤϯδχΞ ଜւ!LJNSPNJ ϗεςΟϯάࣄۀ෦ϜʔϜʔυϝΠϯνʔϜ
ຖि༵͓ۚனͷ (P-VODI
ͳΜ͔ॻ͍ͯΈ͍ͨͳ͊
None
ॻ͍ͯΈͨʂ
TFOENBJMMPHHFS IUUQTHJUIVCDPNLJNSPNJTFOENBJMMPHHFS ͍ͨͩ·W
TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJM Ϣʔβʔ ɾϢʔβʔొ ɾυϝΠϯऔಘɺߋ৽ ɾظݶΕؒۙͷҊ ɹɹɹɹɹɹͳͲͷϝʔϧ
TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJMMPHHFS Ϣʔβʔ ɾϢʔβʔొ ɾυϝΠϯऔಘɺߋ৽ ɾظݶΕؒۙͷҊ ɹɹɹɹɹɹͳͲͷϝʔϧ
TFOENBJM NBJM MPH
TFOENBJMMPHHFSʁ ϜʔϜʔυϝΠϯ 1)1ɾ3VCZ "QQMJDBUJPO TFOENBJMMPHHFS Ϣʔβʔ ɾϢʔβʔొ ɾυϝΠϯऔಘɺߋ৽ ɾظݶΕؒۙͷҊ ɹɹɹɹɹɹͳͲͷϝʔϧ
TFOENBJM NBJM MPH UBJM
Ͳ͏͍͍ͷʁ w ސ٬ཧ͔Βϝʔϧૹ৴ঢ়گΛӾཡͰ͖Δ ظݶΕલʹϝʔϧ͕͜ͳ͔ͬͨΜͰ͚͢ͲʂʁʹରԠ͍͢͠ w ֬ೝ༻ͷϝʔϧΞυϨεͷϝʔϧૹ৴͕ෆཁʹ Ϣʔβʔ̍௨ɺ֬ೝ༻ϝʔϧΞυϨε̍௨ͷ̎௨ૹ৴͍ͯ͠Δɾɾ
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 ઃఆϑΝΠϧFUDTFOENBJMMPHHFSDPOpHZBNM ྫ $FOU04CJU όΠφϦΛ(JUIVCʹஔ͍͍ͯΔͷͰ 04ʹ͋ͬͨͷΛμϯϩʔυ͢Δ͚ͩ
ઃఆํ๏ 1)1 sendmail_path = /usr/sbin/sendmail -t -i sendmail_path = /usr/local/bin/sendmail-logger
QIQJOJ sendmail_path = sendmail-logger # path௨ͬͯΕ
ઃఆํ๏ 3VCZ"DUJWF.BJMFSPO3BJMT 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
࣮͔Β·ͰͷಓͷΓ w ࣮ w ΫϩείϯύΠϧ w όΠφϦ ҙ֎ͱ͢ΜͳΓ͍͚ͨΫϚʔ
࣮ 1.
TFOENBJMMPHHFSͰ͍ͬͯΔ͜ͱ w ࣮ߦϩάग़ྗ w ඪ४ೖྗಡΈࠐΈ w ZBNMϑΝΠϧಡΈࠐΈ w ϝʔϧϩάϑΝΠϧग़ྗ w
TFOENBJMίϚϯυ࣮ߦ
࣮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") } ¥ 3FBEBOE8SJUF ϑΝΠϧͳ͔ͬͨΒ࡞Δ ඌʹςΩετՃ
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 GPSͰશߦऔಘ͢Δ
ZBNMϑΝΠϧಡΈࠐΈ w HPZBNMZBNMZBNMಡΈࠐΈϥΠϒϥϦ 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
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(Pඪ४ͷ04ػೳͷΠϯλʔϑΣʔεύοέʔδ 8SJUF0OMZ EFGFSͰ࣮ߦྃ࣌ʹ ϑΝΠϧΫϩʔζ͢Δ
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 ඪ४ग़ྗΛมʹऔΓࠐΉ
ΫϩείϯύΠϧ 2.
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࡞ HPHFUͰΠϯετʔϧ
όΠφϦ 3.
HIS w HJUIVCDPNʹWFSTJPOUBH͖ͰϦϦʔε IUUQTHJUIVCDPNUDOLTNHIS $ go get github.com/tcnksm/ghr $ gox
-output "pkg/{{.Dir}}_{{.OS}}_{{.Arch}}" $ ghr v0.0.2 pkg/ WFSTJPOUBHΛ༩ͯ͠ϦϦʔε όΠφϦμϯϩʔυͰ͖Δ HPHFUͰΠϯετʔϧ
͓ΘΓɻ؆୯ɻ
ͳΜ͔ॻ͍ͯΈ·͠ΐʂ ͕Ͱ͖͔ͨΒΈΜͳͰ͖Δ
ࠓޙ w ςετॻ͍ͯͳ͍ɾɾɾ w TNUQͷରԠͱ͔ w qVFOUEͱ࿈ܞͯ͠5SFBTVSF%BUBʢݕূதʣ w ސ٬ཧ͔Βϝʔϧ༰ΛݟΕΔΑ͏ʹ w
֬ೝ༻ϝʔϧΞυϨεͷૹ৴Λ໓