GoͱΞΫλʔϞσϧͰ ES+CQRSΛ࣮ફ SEN Developer Meetup vol.2

Pro fi le • ஛ᖒ ༗و a.k.a ytake • ઍגࣜձࣾ CTO / ΄͔ٕज़ސ໰ • Go / Scala • ΞΫλʔϞσϧେ޷͖

GoͰຊ֨తͳΞΫλʔϞσϧʂ

݁ہͷͱ͜Ζ • ΞΫλʔϞσϧ͸ϓϩάϥϛϯάύϥμΠϜ͕ͪΐͬͱҧ͏΋ͷ • ฉ͚ͩ͘Ͱ͸ͳ͔ͳ͔೉͍͠ͷͰɺͥͻ৮ͬͯΈ͍ͯͩ͘͞ • εςʔτϑϧʹ

No content

Proto.Actor • Akka / Pekkoͱڞ௨ͷ֓೦ʹجͮ͘΋ͷ • Akka / Pekko΄ͲߴػೳͰ͸ͳ͍͕ɺෆࣗ༝͕ͳ͍͘Β͍ἧ͍ͬͯΔ • ࠓճ͸ӬଓԽ౳ʹؔ͢Δ΋ͷ

ΞΫλʔϞσϧʹ͍ͭͯཧղ͢ΔͨΊʹ

ΑΓཧղ͢ΔͨΊʹ

No content

؆୯ʹ֓೦঺հ

ΞΫλʔϞσϧ • ฒߦܭࢉͷͨΊͷϞσϧ • ఻౷తͳϓϩάϥϛϯάελΠϧͱଟগ͜ͱͳΓɺ ͢΂ͯͷΞΫλʔ͸ಠཱͯ͠ฒߦ • ΦϒδΣΫτͷ֎͔Β௚઀ίʔϧͯ͠ґཔ͢ΔͳͲ͸Ͱ͖·ͤΜ

No content

֊૚ߏ଄Λ΋ͭ

No content

No content

ES+CQRSʹ͍ͭͯ

No content

Command • γεςϜ΁ͷมߋࢦࣔ • ίϚϯυ͕࣮ߦ͞ΕΔͱɺγεςϜ͕৽͍͠ঢ়ଶʹมԽ

No content

Query • ϢʔβʔʹσʔλΛදࣔͨ͠Γɺ • ผͷγεςϜʹૹ৴ͨ͠Γɺ ίϚϯυͱ͸ผͷ໨తͰ࢖༻ • ίϚϯυͱ͸Ϟσϧ͕ผͱ͍͏͜ͱ

No content

Event Store? • ίϚϯυΛड͚ͯ৽͍͠ঢ়ଶʹมԽ • ͜ΕΛΠϕϯτͱͯ͠อ؅ʢΠϕϯτετΞ΁ʣ • ΠϕϯτετΞ͸௚઀ΫΤϦʹར༻͞ΕΔΘ͚Ͱ͸ͳ͍

No content

No content

ӬଓԽ͢Δʹ͸ • Protocol BuffersΛར༻͢Δ • ΠϕϯτετΞʹ͍ͭͯ͸ΠϯλʔϑΣʔεΛ࣮૷ • ΠϕϯτͷӬଓԽΛߦ͍ɺ֘౰ͷΞΫλʔͷঢ়ଶΛ؅ཧ • ঢ়ଶ෮ݩ͸ࣗಈͰ࣮ߦ͞Ε·͢

package persistence import ( "google.golang.org/protobuf/proto" ) // Provider is the abstraction used for persistence type Provider interface { GetState() ProviderState } // ProviderState is an object containing the implementation for the provider type ProviderState interface { SnapshotStore EventStore Restart() GetSnapshotInterval() int } type SnapshotStore interface { GetSnapshot(actorName string) (snapshot interface{}, eventIndex int, ok bool) PersistSnapshot(actorName string, snapshotIndex int, snapshot proto.Message) DeleteSnapshots(actorName string, inclusiveToIndex int) } type EventStore interface { GetEvents(actorName string, eventIndexStart int, eventIndexEnd int, callback func(e interface{})) PersistEvent(actorName string, eventIndex int, event proto.Message) DeleteEvents(actorName string, inclusiveToIndex int) }

package persistence import ( "google.golang.org/protobuf/proto" ) // Provider is the abstraction used for persistence type Provider interface { GetState() ProviderState } // ProviderState is an object containing the implementation for the provider type ProviderState interface { SnapshotStore EventStore Restart() GetSnapshotInterval() int } type SnapshotStore interface { GetSnapshot(actorName string) (snapshot interface{}, eventIndex int, ok bool) PersistSnapshot(actorName string, snapshotIndex int, snapshot proto.Message) DeleteSnapshots(actorName string, inclusiveToIndex int) } type EventStore interface { GetEvents(actorName string, eventIndexStart int, eventIndexEnd int, callback func(e interface{})) PersistEvent(actorName string, eventIndex int, event proto.Message) DeleteEvents(actorName string, inclusiveToIndex int) } ঢ়ଶͷӬଓԽʹͳʹΛ࢖͏͔

package persistence import ( "google.golang.org/protobuf/proto" ) // Provider is the abstraction used for persistence type Provider interface { GetState() ProviderState } // ProviderState is an object containing the implementation for the provider type ProviderState interface { SnapshotStore EventStore Restart() GetSnapshotInterval() int } type SnapshotStore interface { GetSnapshot(actorName string) (snapshot interface{}, eventIndex int, ok bool) PersistSnapshot(actorName string, snapshotIndex int, snapshot proto.Message) DeleteSnapshots(actorName string, inclusiveToIndex int) } type EventStore interface { GetEvents(actorName string, eventIndexStart int, eventIndexEnd int, callback func(e interface{})) PersistEvent(actorName string, eventIndex int, event proto.Message) DeleteEvents(actorName string, inclusiveToIndex int) } ΠϕϯτετΞʢδϟʔφϧʣ޲͚ ӬଓԽͷํ๏ʢΫΤϦʣ΍ ෮ݩ࣌ͷΫΤϦͳͲ

package persistence import ( "google.golang.org/protobuf/proto" ) // Provider is the abstraction used for persistence type Provider interface { GetState() ProviderState } // ProviderState is an object containing the implementation for the provider type ProviderState interface { SnapshotStore EventStore Restart() GetSnapshotInterval() int } type SnapshotStore interface { GetSnapshot(actorName string) (snapshot interface{}, eventIndex int, ok bool) PersistSnapshot(actorName string, snapshotIndex int, snapshot proto.Message) DeleteSnapshots(actorName string, inclusiveToIndex int) } type EventStore interface { GetEvents(actorName string, eventIndexStart int, eventIndexEnd int, callback func(e interface{})) PersistEvent(actorName string, eventIndex int, event proto.Message) DeleteEvents(actorName string, inclusiveToIndex int) } εφοϓγϣοτ޲͚ ӬଓԽͷํ๏ʢΫΤϦʣ΍ ෮ݩ࣌ͷΫΤϦͳͲ

ӬଓԽ • δϟʔφϧ͸ঢ়ଶมߋΛৗʹهԱ • δϟʔφϧΛ͍͔ͭ͘ॻ͖ࠐΉͨͼʹεφοϓγϣοτΛอ؅ • ෮ݩ͸಄͔Β࣮ߦ͞ΕΔ͕ɺεφοϓγϣοτ͕͋Ε͹͔ͦ͜Β෮ݩ

type Actor interface { Receive(c Context) }

package acme import ( "errors" "fmt" "github.com/asynkron/protoactor-go/actor" "github.com/asynkron/protoactor-go/persistence" // ུ "google.golang.org/protobuf/proto" ) // Cart is an actor to create cart type Cart struct { persistence.Mixin stream *actor.PID state *cart.Items }

package acme import ( "errors" "fmt" "github.com/asynkron/protoactor-go/actor" "github.com/asynkron/protoactor-go/persistence" // ུ "google.golang.org/protobuf/proto" ) // Cart is an actor to create cart type Cart struct { persistence.Mixin stream *actor.PID state *cart.Items } ΞΫλʔͷӬଓԽΛར༻͢Δ৔߹ʹ ඞਢ

package acme import ( "errors" "fmt" "github.com/asynkron/protoactor-go/actor" "github.com/asynkron/protoactor-go/persistence" // ུ "google.golang.org/protobuf/proto" ) // Cart is an actor to create cart type Cart struct { persistence.Mixin stream *actor.PID state *cart.Items } $BSUΞΫλʔͷঢ়ଶ

package acme import ( "errors" "fmt" "github.com/asynkron/protoactor-go/actor" "github.com/asynkron/protoactor-go/persistence" // ུ "google.golang.org/protobuf/proto" ) // Cart is an actor to create cart type Cart struct { persistence.Mixin stream *actor.PID state *cart.Items } ϦʔυϞσϧߋ৽ΞΫλʔͳͲ΁

No content

No content

ΞΫλʔͷঢ়ଶΛมߋ υϝΠϯϞσϧʹ߹Θͤͯදݱ

ΞΫλʔͷঢ়ଶΛมߋ υϝΠϯΠϕϯτ

ΠϕϯτετΞͰ ΠϕϯτӬଓԽ

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Name) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } }

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Email) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } } ίϚϯυΛडऔɺ ࣗΞΫλʔͷঢ়ଶΛมߋ ঢ়ଶมߋΛΠϕϯτͱͯ͠ӬଓԽ

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Name) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } } ͢Ͱʹঢ়ଶ͕͋Δʢੜ੒ࡁΈͳͲʣ৔߹͸ ࣗ਎Λมߋͤͣʹϝοηʔδฦ৴

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Name) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } } ϦʔυϞσϧߋ৽ϋϯυϥʢΞΫλʔʣ΁

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Name) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } } ॲཧऴྃޙʹΞΫλʔΛ࡟আ

func (u *Cart) Receive(context actor.Context) { defer context.Poison(context.Self()) switch msg := context.Message().(type) { case *persistence.RequestSnapshot: u.PersistSnapshot(u.state) case *persistence.ReplayComplete: // ϦϓϨΠ͕׬ྃͨ͠Β಺෦ঢ়ଶΛมߋ͢Δ context.Logger().Info( fmt.Sprintf("replay completed, internal state changed to '%v'", u.state)) case *command.AddItem: if u.IsStateExists(msg.Name) { context.Send(u.stream, &message.AddItemError{Message: "item already exists"}) return } // ུ u.persistence(context, ev) // xxxੜ੒ΠϕϯτΛΠϕϯτετϦʔϜ΁ context.Send(u.stream, ev) case *event.ItemAdded: if msg.String() != "" { // event ͕ϦϓϨΠ͞Εͨ৔߹͸ঢ়ଶΛߋ৽͢Δ u.state = msg u.sendToReadModelUpdater(context, msg) } } } ΞΫλʔੜ੒ʢ࠶ੜ੒ɺϦελʔτͳͲʣ࣌ աڈͷঢ়ଶ͕͋Ε͹ɺ ࠷ॳͷΠϕϯτ͔Βड৴͠ɺঢ়ଶΛ෮ݩ

No content

ϦʔυϞσϧߋ৽ΞΫλʔ͕ 2VFSZ༻ͷσʔλϕʔεΛߋ৽

// ReadModelUpdate is actor to update read model type ReadModelUpdate struct { query mysql.RegistrationItemExecutor } // NewReadModelUpdate is constructor for ReadModelUpdate func NewReadModelUpdate(query mysql.RegistrationItemExecutor) actor.Actor { return &ReadModelUpdate{ query: query, } } // Receive is sent messages to be processed from the mailbox associated with the instance of the actor func (u *ReadModelUpdate) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *event.ItemAdded: // ΠϕϯτΛಡΈࠐΜͰɺRead ModelΛߋ৽͢Δ // ͜͜Ͱ͸Read ModelʹΞΠςϜ͕ଘࡏ͠ͳ͍৔߹ʹ࡞੒͢Δ෩ err := u.query.AddItemIfNotExists(context.Background(), mysql.AddItemParams{ Name: msg.ItemName, ID: msg.ItemID, }) if err != nil { // Τϥʔ͕ൃੜͨ͠৔߹͸ϩάΛग़ྗ͢Δ ctx.Logger().Error(err.Error()) return } } }

// ReadModelUpdate is actor to update read model type ReadModelUpdate struct { query mysql.RegistrationItemExecutor } // NewReadModelUpdate is constructor for ReadModelUpdate func NewReadModelUpdate(query mysql.RegistrationItemExecutor) actor.Actor { return &ReadModelUpdate{ query: query, } } // Receive is sent messages to be processed from the mailbox associated with the instance of the actor func (u *ReadModelUpdate) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *event.ItemAdded: // ΠϕϯτΛಡΈࠐΜͰɺRead ModelΛߋ৽͢Δ // ͜͜Ͱ͸Read ModelʹΞΠςϜ͕ଘࡏ͠ͳ͍৔߹ʹ࡞੒͢Δ෩ err := u.query.AddItemIfNotExists(context.Background(), mysql.AddItemParams{ Name: msg.ItemName, ID: msg.ItemID, }) if err != nil { // Τϥʔ͕ൃੜͨ͠৔߹͸ϩάΛग़ྗ͢Δ ctx.Logger().Error(err.Error()) return } } } 2VFSZͰར༻͍ͨ͠ςʔϒϧͳͲʹ൓ө

ΞΫλʔΛੜ੒ • ͜ͷྫͰ͸RestAPIΞΫλʔΛϧʔτʹ • ίϚϯυ͔Βঢ়ଶมԽɺ ΫΤϦͰඞཁͳςʔϒϧͷՃ޻ʢϦʔυϞσϧߋ৽ϋϯυϥʣ ͦΕͧΕͷΞΫλʔΛੜ੒

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } }

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } } ϦʔυϞσϧߋ৽ΞΫλʔ

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } } ίϚϯυΛड͚෇͚ΔΞΫλʔ

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } } ΞΫλʔͷӬଓԽࢦࣔ 1SPUP"DUPSͰ͸ϛυϧ΢ΣΞͱͯ͠දݱ

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } } ಠཱͨ͠ΞΫλʔʹࣝผՄೳͳ໊લΛ༩͑ɺ ෮ݩ࣌ʹಠཱͯ͠෮ݩ͞ΕΔ

func (a *RestAPI) Receive(ctx actor.Context) { switch msg := ctx.Message().(type) { case *actor.Started: a.rmu = ctx.Spawn(actor.PropsFromProducer(func() actor.Actor { return registration.NewItemModelUpdate(a.db) })) case *command.AddItem: ref, err := ctx.SpawnNamed( actor.PropsFromProducer(func() actor.Actor { return registration.NewItem(msg.Stream, a.rmu) }, actor.WithReceiverMiddleware(persistence.Using(a.provider))), "item-"+msg.Name) if errors.Is(err, actor.ErrNameExists) { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("item %s already exists", msg.Email)}) return } if err != nil { ctx.Send(msg.Stream, &message.ItemCreateError{Message: fmt.Sprintf("failed error %s", err.Error())}) return } ctx.Send(ref, msg) } } ΞΫλʔ͕ੜ੒Ͱ͖ͳ͔ͬͨ৔߹ͷΤϥʔ

ΞΫλʔγεςϜ͕શମΛ؅ཧ ো֐ͳͲʹ΋ڧ͘ɺ ಄͔Β࣮֬ʹ෮چ

No content

func (u *ItemRegistration) Handle(c echo.Context) error { ui := new(itemInput) if err := c.Bind(ui); err != nil { return echo.NewHTTPError(http.StatusBadRequest, err.Error()) } if err := c.Validate(ui); err != nil { return err } go func() { u.system.Root.Send(u.ref, &command.AddItem{ // ུ Name: ui.Name, Stream: u.stream.PID(), }) }() res := <-u.stream.C() if res.IsSuccess() { return c.JSON(http.StatusOK, res) } return c.JSON(http.StatusBadRequest, res) }

func (u *ItemRegistration) Handle(c echo.Context) error { ui := new(itemInput) if err := c.Bind(ui); err != nil { return echo.NewHTTPError(http.StatusBadRequest, err.Error()) } if err := c.Validate(ui); err != nil { return err } go func() { u.system.Root.Send(u.ref, &command.AddItem{ // ུ Name: ui.Name, Stream: u.stream.PID(), }) }() res := <-u.stream.C() if res.IsSuccess() { return c.JSON(http.StatusOK, res) } return c.JSON(http.StatusBadRequest, res) } 1SPUP"DUPS΁ૹ৴

func (u *ItemRegistration) Handle(c echo.Context) error { ui := new(itemInput) if err := c.Bind(ui); err != nil { return echo.NewHTTPError(http.StatusBadRequest, err.Error()) } if err := c.Validate(ui); err != nil { return err } go func() { u.system.Root.Send(u.ref, &command.AddItem{ // ུ Name: ui.Name, Stream: u.stream.PID(), }) }() res := <-u.stream.C() if res.IsSuccess() { return c.JSON(http.StatusOK, res) } return c.JSON(http.StatusBadRequest, res) } ΄͍͠ϝοηʔδΛετϦʔϜ͔ΒऔΓग़͢ ଞʹ΋'VUVSFΛ࢖͏ͳͲ΋͋Γ·͢

·ͱΊ • ΞΫλʔϞσϧ͸ϓϩάϥϛϯάύϥμΠϜ͕ͪΐͬͱҧ͏΋ͷ • ฉ͚ͩ͘Ͱ͸ͳ͔ͳ͔೉͍͠ͷͰɺͥͻ৮ͬͯΈ͍ͯͩ͘͞ • ཧղ͑͞Ͱ͖Ε͹ڧྗͳπʔϧʹʂ