Configuration language for Go is any good?

TL;DR; HCLを使え

Transcript

1. HCL/TOML
   ศར @linyows / Fukuoka.go
2. @linyows / Tomohisa Oda GMO pepabo, inc
   ٕज़ج൫νʔϜ
   SCRAPTURE
3. ͓஌Βͤ དྷि໦༵
   ೔
   
   ʹ
   
   5SBWJT
   .FFUVQ
   JO
   ෱Ԭɹ͕͋Γ·͢
   5SBWJT
   $*ͷ
   )JSP
   "TBSJ͞Μ
   ͕དྷ೔ʢདྷ෱ʣ͞ΕΔͷͰɺ͓࿩Λ ࢕ͬͨΓ࣭໰ͨ͠Γ͢ΔձͰ͢ɻ-5ืूதͰ͢ʂʂʂ
   IUUQLJCBOEPPSLFFQFSKQFWFOUT
4. ઃఆϑΝΠϧͲ͏ͯ͠Δʁ JSON / YAML / GO…
5. JSON { "foo": { "bar": "hello", "baz": { "key": 7, "hoge": true, "values": [0, 1, 2] } } } • なんか冗長すぎる • コメントが書けない • Structにtag書くの面倒 • 記述に迷う事はない
6. YAML foo: bar: hello baz: key: 7 hoge: off on: 'true' # comment~ values: [0, 1, 2] fuga: !str 123 "999": ~ • シンプルに書ける（コンパクト） • 色々な表現が出来る Anchor/Alias 型宣言 • 逆に敷居が高いのかも… キーにハイフンとか • でもまあ、yamlで良い気がするけど
7. ͡Ό͋ GoͰ… func MyConfig() *Config { return &Config{ Bar: "hello", Baz: BazConfig{ Key: 7, Hoge: true, Values: []int{1, 2, 3}, }, } } • ださい…し、Goの知識がない人はつらい
8. HCL !?
9. HCLͱ͸ HashiCorp Configuration Language
   ͷུ
   Vagrant, Serf…
   ͱ͔ͷ
   HashCorp੡
   JSONޓ׵…
   JSON΍YAMLΛผͳݴޠʹஔ͖׵͑Δ΋ͷͰ͸ͳ͍ผͷϨΠϠʔ
   JSONΛϑϨϯυϦʔʹͨ͠΋ͷ
10. Grammar hclData := ` a = "Easy!" b { c = 2 // comment~ d = [3, 4] e = true } ` variable "foo" { default = "bar" description = "bar" } variable "amis" { default = { east = "foo" } }
11. Decode type Config struct { A string B struct { C int D []int E bool } } hclObject, _ := hcl.Parse(hclData) fmt.Println(hclObject) // &{ 7 [0x2081f0240 0x2081f0390 0x2081f0480 0x2081f0600 0x2081f0690] <nil>} fmt.Println(hclObject.Get("b", false).Get("e", false).Value) // true var c Config hcl.DecodeObject(&c, hclObject) fmt.Println(c) // {Easy! {2 [3 4] true} false}
12. TOML !?
13. TOMLͱ͸ Tom's Obvious, Minimal Language
    ͷུ
    Github Cofounder
    ͷ Tom Preston-Werner (@mojombo)੡
    ϑϨϯυϦʔͳಡΈॻ͖
    ύʔαΛॻ͘ͷ͕؆୯Β͍͠
14. Grammar hclData := ` A = "Easy!" ! [B] C = 2 D = [3, 4] E = true ` title = "TOML Example" ! [owner] name = "Tom Preston-Werner" organization = "GitHub" bio = "GitHub Cofounder & CEO\nLikes tater tots and beer." dob = 1979-05-27T07:32:00Z # First class dates? Why not? ! [database] server = "192.168.1.1" ports = [ 8001, 8001, 8002 ] connection_max = 5000 enabled = true [servers] ! # comment [servers.alpha] ip = "10.0.0.1" dc = "eqdc10" ! [servers.beta] ip = "10.0.0.2" dc = "eqdc10"
15. Decode type Config struct { A string B struct { C int D []int E bool } } var c Config meta, _ := toml.Decode(tomlData, &config) fmt.Println(config) // {Easy! {2 [3 4] true}} fmt.Println(meta) // {map[A:Easy! B:map[D:[3 4] E:true C:2]] map[A:String B:Hash B.C:Integer B.D:Array B.E:Bool] [[A] [B] [B C] [B D] [B E]] map[B.C:true B.D:true B.E:true A:true B:true] []}
16. ͋Γ͕ͱ͏͍͟͝·ͨ͠