diff --git a/contrib/saga/go.mod b/contrib/saga/go.mod new file mode 100644 index 000000000..a1560c8ce --- /dev/null +++ b/contrib/saga/go.mod @@ -0,0 +1,12 @@ +module go.temporal.io/sdk/contrib/saga + +go 1.16 + +require ( + github.com/stretchr/testify v1.8.0 + go.temporal.io/sdk v1.17.0 + go.uber.org/multierr v1.1.0 + go.uber.org/zap v1.10.0 +) + +replace go.temporal.io/sdk => ../../ diff --git a/contrib/saga/go.sum b/contrib/saga/go.sum new file mode 100644 index 000000000..e4c696fad --- /dev/null +++ b/contrib/saga/go.sum @@ -0,0 +1,239 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod 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All rights reserved. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package saga + +import ( + "errors" + "time" + + "go.temporal.io/sdk/interceptor" + "go.temporal.io/sdk/workflow" + "go.uber.org/multierr" + "go.uber.org/zap" +) + +const ( + malformedActivity = "args of saga activity != 1" +) + +var ( + defaultActivityOpts = workflow.ActivityOptions{ + ScheduleToStartTimeout: 1 * time.Minute, + StartToCloseTimeout: 5 * time.Minute, + } +) + +type ( + // CompensateOptions is options for compensate. + CompensateOptions struct { + // ActivityType is the name of compensate activity. + ActivityType string + // ActivityOptions is the activity execute options, local activity is not supported. + ActivityOptions *workflow.ActivityOptions + // Convertor optional. Convert req & response to request for compensate activity. + // currently, activity func is not available for worker, so decode futures should be done by developer. + Convertor func(ctx workflow.Context, f workflow.Future, args interface{}) (interface{}, error) + } + + //InterceptorOptions is options for saga interceptor. + InterceptorOptions struct { + // WorkflowRegistry names for workflow to be treated as Saga transaction. + WorkflowRegistry map[string]struct{} + // ActivityRegistry Action -> CompensateAction, key is activity type for action. + ActivityRegistry map[string]CompensateOptions + } + + sagaInterceptor struct { + interceptor.WorkerInterceptorBase + options InterceptorOptions + } + + workflowInboundInterceptor struct { + interceptor.WorkflowInboundInterceptorBase + root *sagaInterceptor + ctx sagaContext + } + workflowOutboundInterceptor struct { + interceptor.WorkflowOutboundInterceptorBase + root *sagaInterceptor + ctx *sagaContext + } + + action struct { + ActivityType string + Future workflow.Future + Arg interface{} + } + + sagaContext struct { + Actions []*action + } +) + +// NewInterceptor creates an interceptor for execute in Saga patterns. +// when workflow fails, registered compensate activities will be executed automatically. +// NOTE: action&compensate activity has only one arg, +// like func(ctx context.Context, arg interface{}) (interface{}, error), +// or func(ctx context.Context, arg interface{}) error. +func NewInterceptor(options InterceptorOptions) (interceptor.WorkerInterceptor, error) { + return &sagaInterceptor{options: options}, nil +} + +func (s *sagaInterceptor) InterceptWorkflow( + ctx workflow.Context, + next interceptor.WorkflowInboundInterceptor, +) interceptor.WorkflowInboundInterceptor { + if _, ok := s.options.WorkflowRegistry[workflow.GetInfo(ctx).WorkflowType.Name]; !ok { + return next + } + + workflow.GetLogger(ctx).Debug("intercept saga workflow") + i := &workflowInboundInterceptor{root: s} + i.Next = next + return i +} + +func (w *workflowInboundInterceptor) Init(outbound interceptor.WorkflowOutboundInterceptor) error { + i := &workflowOutboundInterceptor{root: w.root, ctx: &w.ctx} + i.Next = outbound + return w.Next.Init(i) +} + +func (w *workflowInboundInterceptor) ExecuteWorkflow( + ctx workflow.Context, + in *interceptor.ExecuteWorkflowInput, +) (ret interface{}, err error) { + workflow.GetLogger(ctx).Debug("intercept ExecuteWorkflow") + ret, wferr := w.Next.ExecuteWorkflow(ctx, in) + if wferr == nil || len(w.ctx.Actions) == 0 { + return ret, wferr + } + + ctx, cancel := workflow.NewDisconnectedContext(ctx) + defer cancel() + for i := len(w.ctx.Actions) - 1; i >= 0; i-- { + a := w.ctx.Actions[i] + opt, ok := w.root.options.ActivityRegistry[a.ActivityType] + if !ok { + workflow.GetLogger(ctx).Warn("action in history has no compensate activity", + "activity_type", a.ActivityType) + continue + } + + // only compensate action with success + if err := a.Future.Get(ctx, nil); err != nil { + continue + } + + // add opts if not config + activityOpts := opt.ActivityOptions + if activityOpts == nil { + activityOpts = &defaultActivityOpts + } + ctx = workflow.WithActivityOptions(ctx, *activityOpts) + + // use arg in action as default for compensate + arg := a.Arg + if opt.Convertor != nil { + arg, err = opt.Convertor(ctx, a.Future, arg) + if err != nil { + workflow.GetLogger(ctx).Error("failed to convert to compensate req", zap.Error(err)) + return ret, multierr.Append(wferr, err) + } + } + + if err := workflow.ExecuteActivity(ctx, opt.ActivityType, arg).Get(ctx, nil); err != nil { + return ret, multierr.Append(wferr, err) + } + } + return ret, wferr +} + +func (w *workflowOutboundInterceptor) ExecuteActivity( + ctx workflow.Context, + activityType string, + args ...interface{}, +) workflow.Future { + workflow.GetLogger(ctx).Debug("intercept ExecuteActivity") + f := w.Next.ExecuteActivity(ctx, activityType, args...) + if _, ok := w.root.options.ActivityRegistry[activityType]; ok { + workflow.GetLogger(ctx).Debug("save action future", "activity_type", activityType) + if len(args) != 1 { + f, set := workflow.NewFuture(ctx) + set.SetError(errors.New(malformedActivity)) + return f + } + w.ctx.Actions = append(w.ctx.Actions, &action{ + ActivityType: activityType, + Future: f, + Arg: args[0], + }) + } + + return f +} + +func (w *workflowOutboundInterceptor) ExecuteLocalActivity( + ctx workflow.Context, + activityType string, + args ...interface{}, +) workflow.Future { + workflow.GetLogger(ctx).Debug("intercept ExecuteLocalActivity") + f := w.Next.ExecuteLocalActivity(ctx, activityType, args...) + if _, ok := w.root.options.ActivityRegistry[activityType]; ok { + workflow.GetLogger(ctx).Debug("save action future", "activity_type", activityType) + if len(args) != 1 { + f, set := workflow.NewFuture(ctx) + set.SetError(errors.New(malformedActivity)) + return f + } + w.ctx.Actions = append(w.ctx.Actions, &action{ + ActivityType: activityType, + Future: f, + Arg: args[0], + }) + } + + return f +} diff --git a/contrib/saga/interceptor_test.go b/contrib/saga/interceptor_test.go new file mode 100644 index 000000000..a090fcb68 --- /dev/null +++ b/contrib/saga/interceptor_test.go @@ -0,0 +1,161 @@ +// The MIT License +// +// Copyright (c) 2021 Temporal Technologies Inc. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package saga + +import ( + "context" + "errors" + "testing" + "time" + + "github.com/stretchr/testify/require" + "go.temporal.io/sdk/activity" + "go.temporal.io/sdk/interceptor" + "go.temporal.io/sdk/testsuite" + "go.temporal.io/sdk/worker" + "go.temporal.io/sdk/workflow" + "go.uber.org/zap" +) + +type orderInfo struct { + ID string + IsDelete bool +} + +var ( + orders = map[string]*orderInfo{} + amount = 1 + suite testsuite.WorkflowTestSuite +) + +func init() { + logger, _ := zap.NewDevelopmentConfig().Build() + zap.ReplaceGlobals(logger) +} + +func createOrder(ctx context.Context, amount int) (string, error) { + zap.L().Info("enter createOrder") + id := "abc" + orders[id] = &orderInfo{ + ID: id, + } + return id, nil +} + +func deleteOrder(ctx context.Context, id string) error { + zap.L().Info("enter deleteOrder", zap.String("id", id)) + orders[id].IsDelete = true + return nil +} + +func stockDeduct(ctx context.Context, in int) error { + zap.L().Info("enter stockDeduct") + amount -= in + return nil +} + +func stockInc(ctx context.Context, in int) error { + zap.L().Info("enter stockInc") + amount += in + return nil +} + +func createPay(ctx context.Context, in int) error { + return errors.New("must fail") +} + +func testConvertor(ctx workflow.Context, f workflow.Future, req interface{}) (rsp interface{}, err error) { + zap.L().Info("convert", zap.Int("req", req.(int))) + var id string + if err := f.Get(ctx, &id); err != nil { + return nil, err + } + return id, nil +} + +func testWorkflow(ctx workflow.Context, a int) error { + zap.L().Debug("enter workflow") + ctx = workflow.WithActivityOptions(ctx, workflow.ActivityOptions{ + StartToCloseTimeout: time.Minute, + }) + var id string + if err := workflow.ExecuteActivity(ctx, "createOrder", a).Get(ctx, &id); err != nil { + return err + } + zap.L().Debug("create order, id:", zap.String("id", id)) + if err := workflow.ExecuteActivity(ctx, "stockDeduct", a).Get(ctx, nil); err != nil { + return err + } + if err := workflow.ExecuteActivity(ctx, "createPay", a).Get(ctx, nil); err != nil { + return err + } + + return nil +} + +func TestWorkflow(t *testing.T) { + env := suite.NewTestWorkflowEnvironment() + intercept, _ := NewInterceptor(InterceptorOptions{ + WorkflowRegistry: map[string]struct{}{ + "testWorkflow": {}, + }, + ActivityRegistry: map[string]CompensateOptions{ + "createOrder": { + ActivityType: "deleteOrder", + Convertor: testConvertor, + }, + "stockDeduct": { + ActivityType: "stockInc", + }, + }, + }) + env.SetWorkerOptions(worker.Options{Interceptors: []interceptor.WorkerInterceptor{intercept}}) + env.RegisterWorkflowWithOptions(testWorkflow, workflow.RegisterOptions{ + Name: "testWorkflow", + }) + env.RegisterActivityWithOptions(createOrder, activity.RegisterOptions{ + Name: "createOrder", + }) + env.RegisterActivityWithOptions(deleteOrder, activity.RegisterOptions{ + Name: "deleteOrder", + }) + env.RegisterActivityWithOptions(stockDeduct, activity.RegisterOptions{ + Name: "stockDeduct", + }) + env.RegisterActivityWithOptions(stockInc, activity.RegisterOptions{ + Name: "stockInc", + }) + env.RegisterActivityWithOptions(createPay, activity.RegisterOptions{ + Name: "createPay", + }) + + env.ExecuteWorkflow(testWorkflow, 1) + require.True(t, env.IsWorkflowCompleted()) + require.Error(t, env.GetWorkflowError()) + require.Equal(t, 1, len(orders)) + for _, order := range orders { + require.True(t, order.IsDelete) + } + require.Equal(t, 1, amount) + env.AssertExpectations(t) +}