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DIίϯςφΛΘͳ͍DI
golang.tokyo#11 2017/12/11
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ࣗݾհ
• Name: ᅳ ହฏ (Morikuni Taihei)
• GitHub: @morikuni
• Twi9er: @inukirom
• ॴଐ
• גࣜձࣾϝϧΧϦ/ικ
• ϝϧΧϦ Χϧ
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ຊͷ༰
❌ DIͰ͖ΔΑ͏ʹίʔυΛॻ͘ํ๏
⭕ DIίϯςφΛΘͣʹґଘؔΛղܾ͢Δํ๏
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Ͳ͏ͬͯґଘؔΛղܾ͢Δʁ
• mainʹॻ͘
• DIίϯςφΛ͏
• DI༻ͷؔΛఆٛ͢Δ
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ྫ
ҎԼͷ3ͭͷؔΛͬͯServiceͷΠϯελϯεΛ࡞Εɻ
func NewService(repo Repository, mailer Mailer) Service { ... }
func NewRepository(db *sql.DB) Repository { ... }
func NewMailer() Mailer { ... }
ServiceRepositoryͱMailerʹґଘ͍ͯ͠Δɻ
Repository*sql.DBʹґଘ͍ͯ͠Δɻ
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mainʹॻ͘
func main() {
db, err := sql.Open("db", "dsn")
if err != nil { ... }
repo := NewRepository(db)
mailer := NewMailer()
service := NewService(repo, mailer)
}
ΦϒδΣΫτ͕૿͑Δʹmain͕ංେԽ͍͖ͯ͠Մಡੑ͕͍
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DIίϯςφΛ͏ (goldi*1)
• yamlʹґଘؔΛهड़͢Δ
• DIίϯςφ༻ͷίʔυΛੜ͢Δ
• DIίϯςφ͔ΒඞཁͳΠϯελϯεΛऔಘ͢Δ
DIίϯςφͷ͍ํΛ֮͑Δඞཁ͕͋Δ
*1 ࣮ࡍʹgoldiΛͬͨ͜ͱͳ͍ͷͰؒҧ͍ͬͯΔՄೳੑ͕͋Γ·͢
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types:
db:
package: database/sql
type: *DB
factory: Open
arguments:
- "db"
- "dsn"
repository:
package: github.com/morikuni/hoge
type: Repository
factory: NewRepository
arguments:
- "@db"
mailer:
package: github.com/morikuni/hoge
type: Mailer
factory: NewMailer
service:
package: github.com/morikuni/hoge
type: Service
factory: NewService
arguments:
- "@repository"
- "@mailer"
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DI༻ͷؔΛఆٛ͢Δ(Injectؔ)
• ΦϒδΣΫτ͕Ҿ0ݸͰऔಘͰ͖ΔΑ͏ʹ͢Δؔ
• ͋ΔΦϒδΣΫτʹ͍ͭͯɺґଘઌ͕Ҿ0ݸͰऔಘͰ͖Εͦ
ͷΦϒδΣΫτҾ0ݸͰऔಘͰ͖Δ
• InjectؔΛΈ߹ΘͤΔ͜ͱͰInjectؔΛ࡞Δ
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Injectؔͷ࣮
InjectDB*sql.DB͕Ҿ0ݸͰऔಘͰ͖ΔΑ͏ʹ͢Δ
func InjectDB() *sql.DB {
db, err := sql.Open("db", "dsn")
if err != nil {
panic(err)
}
return db
}
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Injectؔͷ࣮
*sql.DB͕Ҿ0ݸͰऔಘͰ͖ΔͷͰRepositoryҾ0ݸͰऔಘͰ͖Δ
func InjectRepository() Repository {
return NewRepository(
InjectDB(),
)
}
func InjectMailer() Mailer {
return NewMailer()
}
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Injectؔͷ࣮
RepositoryͱMailer͕Ҿ0ݸͰऔಘͰ͖ΔͷͰɺService
Ҿ0ݸͰऔಘͰ͖ΔΑ͏ʹͳΔ
func InjectService() Service {
return NewService(
InjectRepository(),
InjectMailer(),
)
}
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InjectؔΛ͏ར
• ґଘઌ͕૿ݮͨ͠ͱͯ͠ӨڹൣғInjectؔʹऩ·Δ
• ࣮͕ॻ͔ΕΔpackage͕มΘͬͯӨڹൣғInjectؔʹ
ऩ·Δ
• GoͷίʔυͰॻ͚ΔͷͰߏจΛ৽֮͑͘͠Δඞཁ͕ͳ͍
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ৄ͘͠WebͰʂ
໌(12/12)ͷQiita Advent Calender Go4ʹ
͏গ͠ৄ͍͠هࣄΛॻ͖·͢ʂ
h"ps:/
/qiita.com/advent-calendar/2017/go4