more

2025-10-14 12:30:12 +02:00
parent 7a79efbb9f
commit 0b9c14c231
9 changed files with 201 additions and 25 deletions
--- a/cmd/cart/cart-grain.go
+++ b/cmd/cart/cart-grain.go
@@ -59,12 +59,20 @@ type CartDelivery struct {
 	PickupPoint *messages.PickupPoint `json:"pickupPoint,omitempty"`
 }

+type CartNotification struct {
+	LinkedId int    `json:"id"`
+	Provider string `json:"provider"`
+	Title    string `json:"title"`
+	Content  string `json:"content"`
+}
+
 type CartGrain struct {
 	mu                sync.RWMutex
 	lastItemId        int
 	lastDeliveryId    int
 	lastAccess        time.Time
 	lastChange        time.Time // unix seconds of last successful mutation (replay sets from event ts)
+	userId            string
 	Id                CartId             `json:"id"`
 	Items             []*CartItem        `json:"items"`
 	TotalPrice        int64              `json:"totalPrice"`
@@ -77,6 +85,7 @@ type CartGrain struct {
 	OrderReference    string             `json:"orderReference,omitempty"`
 	PaymentStatus     string             `json:"paymentStatus,omitempty"`
 	Vouchers          []*voucher.Voucher `json:"vouchers,omitempty"`
+	Notifications     []CartNotification `json:"cartNotification,omitempty"`
 }

 func (c *CartGrain) GetId() uint64 {
--- a/cmd/cart/pool-server.go
+++ b/cmd/cart/pool-server.go
@@ -29,7 +29,7 @@ func NewPoolServer(pool actor.GrainPool[*CartGrain], pod_name string, klarnaClie
 	}
 }

-func (s *PoolServer) ApplyLocal(id CartId, mutation ...proto.Message) (*CartGrain, error) {
+func (s *PoolServer) ApplyLocal(id CartId, mutation ...proto.Message) (*actor.MutationResult[*CartGrain], error) {
 	return s.Apply(uint64(id), mutation...)
 }

@@ -55,7 +55,7 @@ func (s *PoolServer) AddSkuToCartHandler(w http.ResponseWriter, r *http.Request,
 	return s.WriteResult(w, data)
 }

-func (s *PoolServer) WriteResult(w http.ResponseWriter, result *CartGrain) error {
+func (s *PoolServer) WriteResult(w http.ResponseWriter, result any) error {
 	w.Header().Set("Content-Type", "application/json")
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Access-Control-Allow-Origin", "*")
@@ -311,9 +311,9 @@ func (s *PoolServer) CreateOrUpdateCheckout(host string, id CartId) (*CheckoutOr
 	}
 }

-func (s *PoolServer) ApplyCheckoutStarted(klarnaOrder *CheckoutOrder, id CartId) (*CartGrain, error) {
+func (s *PoolServer) ApplyCheckoutStarted(klarnaOrder *CheckoutOrder, id CartId) (*actor.MutationResult[*CartGrain], error) {
 	// Persist initialization state via mutation (best-effort)
-	return s.Apply(uint64(id), &messages.InitializeCheckout{
+	return s.ApplyLocal(id, &messages.InitializeCheckout{
 		OrderId:           klarnaOrder.ID,
 		Status:            klarnaOrder.Status,
 		PaymentInProgress: true,
@@ -440,7 +440,7 @@ func (s *PoolServer) ProxyHandler(fn func(w http.ResponseWriter, r *http.Request
 func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, cartId CartId) error {
 	msg := &messages.AddVoucher{}
 	json.NewDecoder(r.Body).Decode(msg)
-	reply, err := s.Apply(uint64(cartId), msg)
+	reply, err := s.ApplyLocal(cartId, msg)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))
--- a/go.mod
+++ b/go.mod
@@ -21,8 +21,10 @@ require (
 	github.com/bits-and-blooms/bitset v1.24.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 // indirect
 	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
+	github.com/getkin/kin-openapi v0.132.0 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-openapi/jsonpointer v0.22.1 // indirect
 	github.com/go-openapi/jsonreference v0.21.2 // indirect
@@ -41,28 +43,43 @@ require (
 	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/gorilla/schema v1.4.1 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
 	github.com/mschoch/smat v0.2.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/oapi-codegen/oapi-codegen/v2 v2.5.0 // indirect
+	github.com/oasdiff/yaml v0.0.0-20250309154309-f31be36b4037 // indirect
+	github.com/oasdiff/yaml3 v0.0.0-20250309153720-d2182401db90 // indirect
+	github.com/perimeterx/marshmallow v1.1.5 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.67.1 // indirect
 	github.com/prometheus/procfs v0.17.0 // indirect
+	github.com/speakeasy-api/jsonpath v0.6.0 // indirect
+	github.com/speakeasy-api/openapi-overlay v0.10.2 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/vmware-labs/yaml-jsonpath v0.3.2 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/mod v0.28.0 // indirect
 	golang.org/x/net v0.46.0 // indirect
 	golang.org/x/oauth2 v0.32.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
 	golang.org/x/sys v0.37.0 // indirect
 	golang.org/x/term v0.36.0 // indirect
 	golang.org/x/text v0.30.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
+	golang.org/x/tools v0.37.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.130.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
 	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 // indirect
@@ -71,3 +88,5 @@ require (
 	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
 	sigs.k8s.io/yaml v1.6.0 // indirect
 )
+
+tool github.com/oapi-codegen/oapi-codegen/v2/cmd/oapi-codegen
--- a/go.sum
+++ b/go.sum
@@ -7,14 +7,25 @@ github.com/bits-and-blooms/bitset v1.24.0 h1:H4x4TuulnokZKvHLfzVRTHJfFfnHEeSYJiz
 github.com/bits-and-blooms/bitset v1.24.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dprotaso/go-yit v0.0.0-20191028211022-135eb7262960/go.mod h1:9HQzr9D/0PGwMEbC3d5AB7oi67+h4TsQqItC1GVYG58=
+github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 h1:PRxIJD8XjimM5aTknUK9w6DHLDox2r2M3DI4i2pnd3w=
+github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936/go.mod h1:ttYvX5qlB+mlV1okblJqcSMtR4c52UKxDiX9GRBS8+Q=
 github.com/emicklei/go-restful/v3 v3.13.0 h1:C4Bl2xDndpU6nJ4bc1jXd+uTmYPVUwkD6bFY/oTyCes=
 github.com/emicklei/go-restful/v3 v3.13.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fxamacker/cbor/v2 v2.9.0 h1:NpKPmjDBgUfBms6tr6JZkTHtfFGcMKsw3eGcmD/sapM=
 github.com/fxamacker/cbor/v2 v2.9.0/go.mod h1:vM4b+DJCtHn+zz7h3FFp/hDAI9WNWCsZj23V5ytsSxQ=
+github.com/getkin/kin-openapi v0.132.0 h1:3ISeLMsQzcb5v26yeJrBcdTCEQTag36ZjaGk7MIRUwk=
+github.com/getkin/kin-openapi v0.132.0/go.mod h1:3OlG51PCYNsPByuiMB0t4fjnNlIDnaEDsjiKUV8nL58=
 github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
 github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
 github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
@@ -49,35 +60,62 @@ github.com/go-openapi/swag/typeutils v0.25.1 h1:rD/9HsEQieewNt6/k+JBwkxuAHktFtH3
 github.com/go-openapi/swag/typeutils v0.25.1/go.mod h1:9McMC/oCdS4BKwk2shEB7x17P6HmMmA6dQRtAkSnNb8=
 github.com/go-openapi/swag/yamlutils v0.25.1 h1:mry5ez8joJwzvMbaTGLhw8pXUnhDK91oSJLDPF1bmGk=
 github.com/go-openapi/swag/yamlutils v0.25.1/go.mod h1:cm9ywbzncy3y6uPm/97ysW8+wZ09qsks+9RS8fLWKqg=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
 github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
+github.com/go-test/deep v1.0.8 h1:TDsG77qcSprGbC6vTN8OuXp5g+J+b5Pcguhf7Zt61VM=
+github.com/go-test/deep v1.0.8/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
+github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
+github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
+github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
+github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
 github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/gnostic-models v0.7.0 h1:qwTtogB15McXDaNqTZdzPJRHvaVJlAl+HVQnLmJEJxo=
 github.com/google/gnostic-models v0.7.0/go.mod h1:whL5G0m6dmc5cPxKc5bdKdEN3UjI7OUGxBlw57miDrQ=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20241029153458-d1b30febd7db h1:097atOisP2aRj7vFgYQBbFN4U4JNXUNYpxael3UzMyo=
 github.com/google/pprof v0.0.0-20241029153458-d1b30febd7db/go.mod h1:vavhavw2zAxS5dIdcRluK6cSGGPlZynqzFM8NdvU144=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/schema v1.4.1 h1:jUg5hUjCSDZpNGLuXQOgIWGdlgrIdYvgQ0wZtdK1M3E=
 github.com/gorilla/schema v1.4.1/go.mod h1:Dg5SSm5PV60mhF2NFaTV1xuYYj8tV8NOPRo4FggUMnM=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
+github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
+github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
 github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
+github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 github.com/matst80/slask-finder v0.0.0-20251009175145-ce05aff5a548 h1:lkxVz5lNPlU78El49cx1c3Rxo/bp7Gbzp2BjSRFgg1U=
 github.com/matst80/slask-finder v0.0.0-20251009175145-ce05aff5a548/go.mod h1:k4lo5gFYb3AqrgftlraCnv95xvjB/w8udRqJQJ12mAE=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
@@ -86,14 +124,38 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
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@@ -108,15 +170,27 @@ github.com/rabbitmq/amqp091-go v1.10.0 h1:STpn5XsHlHGcecLmMFCtg7mqq0RnD+zFr4uzuk
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@@ -144,26 +218,50 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
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@@ -171,6 +269,7 @@ golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
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@@ -184,15 +283,34 @@ google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff h1:
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--- a/pkg/actor/grain_pool.go
+++ b/pkg/actor/grain_pool.go
@@ -6,8 +6,13 @@ import (
 	"github.com/gogo/protobuf/proto"
 )

+type MutationResult[V any] struct {
+	Result    V             `json:"result"`
+	Mutations []ApplyResult `json:"mutations,omitempty"`
+}
+
 type GrainPool[V any] interface {
-	Apply(id uint64, mutation ...proto.Message) (V, error)
+	Apply(id uint64, mutation ...proto.Message) (*MutationResult[V], error)
 	Get(id uint64) (V, error)
 	OwnerHost(id uint64) (Host, bool)
 	Hostname() string
--- a/pkg/actor/mutation_registry.go
+++ b/pkg/actor/mutation_registry.go
@@ -9,8 +9,14 @@ import (
 	"github.com/gogo/protobuf/proto"
 )

+type ApplyResult struct {
+	Type     string        `json:"type"`
+	Mutation proto.Message `json:"mutation"`
+	Error    error         `json:"error,omitempty"`
+}
+
 type MutationRegistry interface {
-	Apply(grain any, msg ...proto.Message) error
+	Apply(grain any, msg ...proto.Message) ([]ApplyResult, error)
 	RegisterMutations(handlers ...MutationHandler)
 	Create(typeName string) (proto.Message, bool)
 	GetTypeName(msg proto.Message) (string, bool)
@@ -145,12 +151,14 @@ func (r *ProtoMutationRegistry) Create(typeName string) (proto.Message, bool) {
 // Returns updated grain if successful.
 //
 // If the mutation is not registered, returns (nil, ErrMutationNotRegistered).
-func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) error {
+func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) ([]ApplyResult, error) {
+	results := make([]ApplyResult, 0, len(msg))
+
 	if grain == nil {
-		return fmt.Errorf("nil grain")
+		return results, fmt.Errorf("nil grain")
 	}
 	if msg == nil {
-		return fmt.Errorf("nil mutation message")
+		return results, fmt.Errorf("nil mutation message")
 	}

 	for _, m := range msg {
@@ -159,18 +167,18 @@ func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) error {
 		entry, ok := r.mutationRegistry[rt]
 		r.mutationRegistryMu.RUnlock()
 		if !ok {
-			return ErrMutationNotRegistered
-		}
-		if err := entry.Handle(grain, m); err != nil {
-			return err
+			results = append(results, ApplyResult{Error: ErrMutationNotRegistered, Type: rt.Name(), Mutation: m})
+			continue
 		}
+		err := entry.Handle(grain, m)
+		results = append(results, ApplyResult{Error: err, Type: rt.Name(), Mutation: m})
 	}

 	// if entry.updateTotals {
 	// 	grain.UpdateTotals()
 	// }

-	return nil
+	return results, nil
 }

 // RegisteredMutations returns metadata for all registered mutations (snapshot).
--- a/pkg/actor/mutation_registry_test.go
+++ b/pkg/actor/mutation_registry_test.go
@@ -78,7 +78,7 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	// Apply happy path
 	state := &cartState{}
 	add := &messages.AddItem{ItemId: 42, Quantity: 3, Sku: "ABC"}
-	if err := reg.Apply(state, add); err != nil {
+	if _, err := reg.Apply(state, add); err != nil {
 		t.Fatalf("Apply returned error: %v", err)
 	}
 	if state.calls != 1 {
@@ -89,17 +89,17 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	}

 	// Apply nil grain
-	if err := reg.Apply(nil, add); err == nil {
+	if _, err := reg.Apply(nil, add); err == nil {
 		t.Fatalf("expected error for nil grain")
 	}

 	// Apply nil message
-	if err := reg.Apply(state, nil); err == nil {
+	if _, err := reg.Apply(state, nil); err == nil {
 		t.Fatalf("expected error for nil mutation message")
 	}

 	// Apply unregistered message
-	if err := reg.Apply(state, &messages.Noop{}); !errors.Is(err, ErrMutationNotRegistered) {
+	if _, err := reg.Apply(state, &messages.Noop{}); !errors.Is(err, ErrMutationNotRegistered) {
 		t.Fatalf("expected ErrMutationNotRegistered, got %v", err)
 	}
 }
--- a/pkg/actor/simple_grain_pool.go
+++ b/pkg/actor/simple_grain_pool.go
@@ -371,13 +371,15 @@ func (p *SimpleGrainPool[V]) getOrClaimGrain(id uint64) (Grain[V], error) {
 // var ErrNotOwner = fmt.Errorf("not owner")

 // Apply applies a mutation to a grain.
-func (p *SimpleGrainPool[V]) Apply(id uint64, mutation ...proto.Message) (*V, error) {
+func (p *SimpleGrainPool[V]) Apply(id uint64, mutation ...proto.Message) (*MutationResult[*V], error) {
 	grain, err := p.getOrClaimGrain(id)
 	if err != nil {
 		return nil, err
 	}
-	if applyErr := p.mutationRegistry.Apply(grain, mutation...); applyErr != nil {
-		return nil, applyErr
+
+	mutations, err := p.mutationRegistry.Apply(grain, mutation...)
+	if err != nil {
+		return nil, err
 	}
 	if p.storage != nil {
 		go func() {
@@ -386,7 +388,14 @@ func (p *SimpleGrainPool[V]) Apply(id uint64, mutation ...proto.Message) (*V, er
 			}
 		}()
 	}
-	return grain.GetCurrentState()
+	result, err := grain.GetCurrentState()
+	if err != nil {
+		return nil, err
+	}
+	return &MutationResult[*V]{
+		Result:    result,
+		Mutations: mutations,
+	}, nil
 }

 // Get returns the current state of a grain.
--- a/pkg/voucher/service.go
+++ b/pkg/voucher/service.go
@@ -1,6 +1,9 @@
 package voucher

-import "math"
+import (
+	"errors"
+	"math"
+)

 type Rule struct {
 	Type  string `json:"type"`
@@ -20,8 +23,13 @@ type Service struct {

 }

+var ErrInvalidCode = errors.New("invalid vouchercode")
+
 func (s *Service) GetVoucher(code string) (*Voucher, error) {
 	value := int64(math.Round(100 * math.Pow(10, 2)))
+	if code == "" {
+		return nil, ErrInvalidCode
+	}
 	return &Voucher{
 		Code:     code,
 		Value:    value,