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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // Copyright 2022 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package linearizability | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/anishathalye/porcupine" | ||
| ) | ||
|
|
||
| const ( | ||
| Append Operation = "append" | ||
| ) | ||
|
|
||
| type AppendRequest struct { | ||
| Op Operation | ||
| Key string | ||
| AppendData string | ||
| } | ||
|
|
||
| type AppendResponse struct { | ||
| GetData string | ||
| } | ||
|
|
||
| type AppendState struct { | ||
| Key string | ||
| Elements []string | ||
| } | ||
|
|
||
| var appendModel = porcupine.Model{ | ||
| Init: func() interface{} { return "{}" }, | ||
| Step: func(st interface{}, in interface{}, out interface{}) (bool, interface{}) { | ||
| var state AppendState | ||
| err := json.Unmarshal([]byte(st.(string)), &state) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| ok, state := appendModelStep(state, in.(AppendRequest), out.(AppendResponse)) | ||
| data, err := json.Marshal(state) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return ok, string(data) | ||
| }, | ||
| DescribeOperation: func(in, out interface{}) string { | ||
| request := in.(AppendRequest) | ||
| response := out.(AppendResponse) | ||
| switch request.Op { | ||
| case Get: | ||
| elements := strings.Split(response.GetData, ",") | ||
| return fmt.Sprintf("get(%q) -> %q", request.Key, elements[len(elements)-1]) | ||
| case Append: | ||
| return fmt.Sprintf("append(%q, %q)", request.Key, request.AppendData) | ||
| default: | ||
| return "<invalid>" | ||
| } | ||
| }, | ||
| } | ||
|
|
||
| func appendModelStep(state AppendState, request AppendRequest, response AppendResponse) (bool, AppendState) { | ||
| if request.Key == "" { | ||
| panic("invalid request") | ||
| } | ||
| if state.Key == "" { | ||
| return true, initAppendState(request, response) | ||
| } | ||
| if state.Key != request.Key { | ||
| panic("Multiple keys not supported") | ||
| } | ||
| switch request.Op { | ||
| case Get: | ||
| return stepAppendGet(state, request, response) | ||
| case Append: | ||
| return stepAppend(state, request, response) | ||
| default: | ||
| panic("Unknown operation") | ||
| } | ||
| } | ||
|
|
||
| func initAppendState(request AppendRequest, response AppendResponse) AppendState { | ||
| state := AppendState{ | ||
| Key: request.Key, | ||
| } | ||
| switch request.Op { | ||
| case Get: | ||
| state.Elements = elements(response) | ||
| case Append: | ||
| state.Elements = []string{request.AppendData} | ||
| default: | ||
| panic("Unknown operation") | ||
| } | ||
| return state | ||
| } | ||
|
|
||
| func stepAppendGet(state AppendState, request AppendRequest, response AppendResponse) (bool, AppendState) { | ||
| newElements := elements(response) | ||
| if len(newElements) < len(state.Elements) { | ||
| return false, state | ||
| } | ||
|
|
||
| for i := 0; i < len(state.Elements); i++ { | ||
| if state.Elements[i] != newElements[i] { | ||
| return false, state | ||
| } | ||
| } | ||
| state.Elements = newElements | ||
| return true, state | ||
| } | ||
|
|
||
| func stepAppend(state AppendState, request AppendRequest, response AppendResponse) (bool, AppendState) { | ||
| if request.AppendData == "" { | ||
| panic("unsupported empty appendData") | ||
| } | ||
| state.Elements = append(state.Elements, request.AppendData) | ||
| return true, state | ||
| } | ||
|
|
||
| func elements(response AppendResponse) []string { | ||
| elements := strings.Split(response.GetData, ",") | ||
| if len(elements) == 1 && elements[0] == "" { | ||
| elements = []string{} | ||
| } | ||
| return elements | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // Copyright 2022 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package linearizability | ||
|
|
||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestAppendModel(t *testing.T) { | ||
| tcs := []struct { | ||
| name string | ||
| operations []testAppendOperation | ||
| }{ | ||
| { | ||
| name: "Append appends", | ||
| operations: []testAppendOperation{ | ||
| {req: AppendRequest{Key: "key", Op: Append, AppendData: "1"}, resp: AppendResponse{}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1"}}, | ||
| {req: AppendRequest{Key: "key", Op: Append, AppendData: "2"}, resp: AppendResponse{}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1,3"}, failure: true}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1,2"}}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "Get validates prefix matches", | ||
| operations: []testAppendOperation{ | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: ""}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1"}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "2"}, failure: true}, | ||
| {req: AppendRequest{Key: "key", Op: Append, AppendData: "2"}, resp: AppendResponse{}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1,3"}, failure: true}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "1,2,3"}}, | ||
| {req: AppendRequest{Key: "key", Op: Get}, resp: AppendResponse{GetData: "2,3"}, failure: true}, | ||
| }, | ||
| }, | ||
| } | ||
| for _, tc := range tcs { | ||
| var ok bool | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| state := appendModel.Init() | ||
| for _, op := range tc.operations { | ||
| t.Logf("state: %v", state) | ||
| ok, state = appendModel.Step(state, op.req, op.resp) | ||
| if ok != !op.failure { | ||
| t.Errorf("Unexpected operation result, expect: %v, got: %v, operation: %s", !op.failure, ok, appendModel.DescribeOperation(op.req, op.resp)) | ||
| } | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| type testAppendOperation struct { | ||
| req AppendRequest | ||
| resp AppendResponse | ||
| failure bool | ||
| } |
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