GoͱTOML Tatsuhiko Kubo@cubicdaiya Gunosy.go#12@2015/04/13 

ࣗݾ঺հ • ٱอୡ඙(Tatsuhiko Kubo) • bokko@cubicdaiya • Software Engineer in Infrastructure Engineering • Mercari, Inc. 

OSS࡞ͬͨΓίϯτϦϏϡʔτͨ͠Γ 

Agenda GoͰϓϩάϥϜΛॻ͘ࡍͷઃఆϑΝΠϧʹ͍ͭͯ 

Έͳ͞ΜɺઃఆϑΝΠϧʹ͸ ීஈԿΛ࢖ͬͯ·͔͢ʁ 

JSON΍YAMLʹINIɺ ࠷ۙͩͱTOML ͳΜ͔΋͋Γ·͢ΑͶ 

ࠓճ͸๻͕ීஈGoͰ։ൃ͢Δࡍʹ ར༻͢ΔઃఆϑΝΠϧܗࣜͷTOMLʹ ͍࣮ͭͯྫΛ౿·͑ͳ͕Βղઆ͠·͢ 

ͦ΋ͦ΋ઃఆϑΝΠϧ͕ඞཁͳཧ༝ • ͨ͘͞ΜͷίϚϯυϥΠϯҾ਺ • ϓϩάϥϜͷύϥϝʔλ੍ޚ • ϓϩάϥϜ಺෦ͷৄࡉ͕Θ͔Βͳ͍ਓͰ΋ϓ ϩάϥϜͷมߋΛՄೳʹ͍ͨ͠ 

ઃఆهड़ݴޠ(ͱͯ͠࢖͑ͦ͏ͳ΋ͷ) • XML • INI • JSON • YAML • TOML • ܰྔݴޠ(Lua, mruby, etc…) 

ݸਓతʹ΋͏͍͍΍ͱࢥͬͯΔ΍ͭ • XML • ਓ͕ؒॻ͘΋ͷ͡Όͳ͍ • YAML • ਓؒʹ͸ॻ͖΍͍͚͢Ͳ࢓༷͕ෳࡶ • JSON • ίϝϯτ͕ॻ͚ͳ͍ • 8ਐ਺͕࢖͑ͳ͍(e.g. ύʔϛογϣϯͱ͔) • ຤ඌͷΧϯϚফ͠๨ΕͯγϯλοΫεΤϥʔorz • σʔλϑΥʔϚοτͱͯ͠͸༏ल͕ͩઃఆϑΝΠϧͱͯ͠͸ͭΒ͍ 

ઃఆهड़ݴޠ(ͱͯ͠࢖͑ͦ͏ͳ΋ͷ) • INI • TOML • ܰྔݴޠ(Lua, mruby, etc…) 

ઃఆهड़ݴޠ(ͱͯ͠࢖͑ͦ͏ͳ΋ͷ) • INI • TOML • ܰྔݴޠ(Lua, mruby, etc…) ࠓճ͸͕࣌ؒͳ͍ͷͰল͖·͢ 

TOML • ͋ΔҙຯAdvanced-INI • ਓ͕ؒಡΈॻ͖͠΍͍͢ • ഑ྻɺ֊૚ߏ଄͕ѻ͑Δ • ࠷ۙࣗ෼͕GoͰ։ൃ͢Δ࣌͸΄΅͜Ε 

TOMLͷGo࣮૷ • ͍Ζ͍Ζ͋Δ͚ͲˣΛ࢖ͬͯ·͢ • github.com/BurntSushi/toml • ઃఆϑΝΠϧͷ஋Λͦͷ··ߏ଄ମʹϚοϐϯάՄೳ • encoding/jsonͷMarshalͱUnMarshalΈ͍ͨͳײ͡ • TOMLͷઃఆࣗମΛੜ੒͢Δ͜ͱ΋Մೳ 

TOML in Go cachectlͷ৔߹ 

cachectl • GoͰॻ͔ΕͨOSͷϖʔδΩϟογϡ֬ೝɾ࡟আπʔϧ • https://github.com/cubicdaiya/cachectl • ແବͳϖʔδΩϟογϡΛղ์͢Δͷʹར༻ • cachectld͍ͬͯ͏σʔϞϯ͕෇͍ͯΔ • ͜ͷσʔϞϯͷઃఆϑΝΠϧ͕TOML 

cachectld.toml 

slackboard • GoͰॻ͔ΕͨSlackϓϩΩγ • https://github.com/cubicdaiya/slackboard • ͜ΕͷઃఆϑΝΠϧ΋TOML 

slackboard.toml [core] port = "29800" slack_url = "https://hooks.slack.com/services/..." [[tags]] tag = "general" channel = "#general" [[tags]] tag = "random" channel = "#random" username = "slackboard" icon_emoji = ":clipboard:" parse = "full" [log] access_log = "stdout" error_log = "stderr" level = "error" [ui] root = "/var/www/slackboard" 

TOMLઃఆ༻ͷߏ଄ମఆٛ(cachectld.toml) type ConfToml struct { Targets []SectionTarget `toml:"targets"` } type SectionTarget struct { Path string `toml:"path"` PurgeInterval uint64 `toml:"purge_interval"` Filter string `toml:"filter"` Rate float64 `toml:"rate"` } encoding/jsonϥΠΫͳΞϊςʔγϣϯ 

TOMLઃఆ༻ͷߏ଄ମఆٛ(slackboard.toml) type ConfToml struct { Core SectionCore `toml:"core"` Tags []SectionTag `toml:"tags"` Log SectionLog `toml:"log"` UI SectionUI `toml:"ui"` } type SectionCore struct { Port string `toml:"port"` SlackURL string `toml:"slack_url"` } type SectionTag struct { Tag string `toml:"tag"` Channel string `toml:"channel"` Username string `toml:"username"` IconEmoji string `toml:"icon_emoji"` Parse string `toml:"parse"` } type SectionLog struct { AccessLog string `toml:"access_log"` ErrorLog string `toml:"error_log"` Level string `toml:"level"` } type SectionUI struct { Root string `toml:"root"` } 

TOMLϑΝΠϧͷϩʔυ func LoadConf(confPath string, confToml *ConfToml) error { _, err := toml.DecodeFile(confPath, confToml) if err != nil { return err } return nil } ؆୯Ͱ͢Ͷ 

TOMLઃఆͷΤΫεϙʔτ var b bytes.Buffer // ݱࡏͷTOMLͷઃఆΛόοϑΝʹॻ͖ग़͢ e := toml.NewEncoder(&b) err := e.Encode(confToml) if err != nil { log.Fatal(err.Error()) } // ઃఆϑΝΠϧͷ಺༰Λग़ྗ fmt.Println(b.String()) 

·ͱΊ • TOML͍͍ΑTOML • GoͳΒˣ͕͓͢͢Ί • github.com/BurntSushi/toml • P.S. • ঺հ͢Δ࣌ؒͳ͔͚ͬͨͲgopher-luaͱ͔ྑͦ͞͏