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transaction_manager_new_workflow.go
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transaction_manager_new_workflow.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// 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.
//go:generate mockgen -copyright_file ../../../LICENSE -package $GOPACKAGE -source $GOFILE -destination transaction_manager_new_workflow_mock.go
package ndc
import (
"context"
"fmt"
"go.temporal.io/api/serviceerror"
"go.temporal.io/server/common/namespace"
"go.temporal.io/server/common/persistence"
"go.temporal.io/server/service/history/shard"
"go.temporal.io/server/service/history/workflow"
)
type (
transactionMgrForNewWorkflow interface {
dispatchForNewWorkflow(
ctx context.Context,
targetWorkflow Workflow,
) error
}
nDCTransactionMgrForNewWorkflowImpl struct {
shardContext shard.Context
transactionMgr TransactionManager
bypassVersionSemanticsCheck bool
}
)
var _ transactionMgrForNewWorkflow = (*nDCTransactionMgrForNewWorkflowImpl)(nil)
func newTransactionMgrForNewWorkflow(
shardContext shard.Context,
transactionMgr TransactionManager,
bypassVersionSemanticsCheck bool,
) *nDCTransactionMgrForNewWorkflowImpl {
return &nDCTransactionMgrForNewWorkflowImpl{
shardContext: shardContext,
transactionMgr: transactionMgr,
bypassVersionSemanticsCheck: bypassVersionSemanticsCheck,
}
}
func (r *nDCTransactionMgrForNewWorkflowImpl) dispatchForNewWorkflow(
ctx context.Context,
targetWorkflow Workflow,
) error {
// NOTE: this function does NOT mutate current workflow or target workflow,
// workflow mutation is done in methods within executeTransaction function
targetExecutionInfo := targetWorkflow.GetMutableState().GetExecutionInfo()
targetExecutionState := targetWorkflow.GetMutableState().GetExecutionState()
namespaceID := namespace.ID(targetExecutionInfo.NamespaceId)
workflowID := targetExecutionInfo.WorkflowId
targetRunID := targetExecutionState.RunId
// we need to check the current workflow execution
currentRunID, err := r.transactionMgr.GetCurrentWorkflowRunID(
ctx,
namespaceID,
workflowID,
)
if err != nil || currentRunID == targetRunID {
// error out or workflow already created
return err
}
if currentRunID == "" {
// current record does not exists
return r.executeTransaction(
ctx,
nDCTransactionPolicyCreateAsCurrent,
nil,
targetWorkflow,
)
}
// there exists a current workflow, need additional check
currentWorkflow, err := r.transactionMgr.LoadWorkflow(
ctx,
namespaceID,
workflowID,
currentRunID,
)
if err != nil {
return err
}
targetWorkflowIsNewer, err := targetWorkflow.HappensAfter(currentWorkflow)
if err != nil {
return err
}
if !targetWorkflowIsNewer {
// target workflow is older than current workflow, need to suppress the target workflow
return r.executeTransaction(
ctx,
nDCTransactionPolicyCreateAsZombie,
currentWorkflow,
targetWorkflow,
)
}
// target workflow is newer than current workflow
if !currentWorkflow.GetMutableState().IsWorkflowExecutionRunning() {
// current workflow is completed
// proceed to create workflow
return r.executeTransaction(
ctx,
nDCTransactionPolicyCreateAsCurrent,
currentWorkflow,
targetWorkflow,
)
}
// current workflow is still running, need to suppress the current workflow
return r.executeTransaction(
ctx,
nDCTransactionPolicySuppressCurrentAndCreateAsCurrent,
currentWorkflow,
targetWorkflow,
)
}
func (r *nDCTransactionMgrForNewWorkflowImpl) createAsCurrent(
ctx context.Context,
currentWorkflow Workflow,
targetWorkflow Workflow,
) error {
targetWorkflowSnapshot, targetWorkflowEventsSeq, err := targetWorkflow.GetMutableState().CloseTransactionAsSnapshot(
workflow.TransactionPolicyPassive,
)
if err != nil {
return err
}
// target workflow to be created as current
if currentWorkflow != nil {
// current workflow exists, need to do compare and swap
createMode := persistence.CreateWorkflowModeUpdateCurrent
prevRunID := currentWorkflow.GetMutableState().GetExecutionState().GetRunId()
prevLastWriteVersion, _, err := currentWorkflow.GetVectorClock()
if err != nil {
return err
}
return targetWorkflow.GetContext().CreateWorkflowExecution(
ctx,
r.shardContext,
createMode,
prevRunID,
prevLastWriteVersion,
targetWorkflow.GetMutableState(),
targetWorkflowSnapshot,
targetWorkflowEventsSeq,
)
}
// current workflow does not exists, create as brand new
createMode := persistence.CreateWorkflowModeBrandNew
prevRunID := ""
prevLastWriteVersion := int64(0)
return targetWorkflow.GetContext().CreateWorkflowExecution(
ctx,
r.shardContext,
createMode,
prevRunID,
prevLastWriteVersion,
targetWorkflow.GetMutableState(),
targetWorkflowSnapshot,
targetWorkflowEventsSeq,
)
}
func (r *nDCTransactionMgrForNewWorkflowImpl) createAsZombie(
ctx context.Context,
currentWorkflow Workflow,
targetWorkflow Workflow,
) error {
targetWorkflowPolicy, err := targetWorkflow.SuppressBy(
currentWorkflow,
)
if err != nil {
return err
}
if !r.bypassVersionSemanticsCheck && targetWorkflowPolicy != workflow.TransactionPolicyPassive {
return serviceerror.NewInternal("transactionMgrForNewWorkflow createAsZombie encountered target workflow policy not being passive")
}
// release lock on current workflow, since current cluster maybe the active cluster
// and events maybe reapplied to current workflow
currentWorkflow.GetReleaseFn()(nil)
currentWorkflow = nil
targetWorkflowSnapshot, targetWorkflowEventsSeq, err := targetWorkflow.GetMutableState().CloseTransactionAsSnapshot(
targetWorkflowPolicy,
)
if err != nil {
return err
}
if err := targetWorkflow.GetContext().ReapplyEvents(
ctx,
r.shardContext,
targetWorkflowEventsSeq,
); err != nil {
return err
}
// target workflow is in zombie state, no need to update current record.
createMode := persistence.CreateWorkflowModeBypassCurrent
prevRunID := ""
prevLastWriteVersion := int64(0)
err = targetWorkflow.GetContext().CreateWorkflowExecution(
ctx,
r.shardContext,
createMode,
prevRunID,
prevLastWriteVersion,
targetWorkflow.GetMutableState(),
targetWorkflowSnapshot,
targetWorkflowEventsSeq,
)
switch err.(type) {
case nil:
return nil
case *persistence.WorkflowConditionFailedError:
// workflow already created
return nil
default:
return err
}
}
func (r *nDCTransactionMgrForNewWorkflowImpl) suppressCurrentAndCreateAsCurrent(
ctx context.Context,
currentWorkflow Workflow,
targetWorkflow Workflow,
) error {
currentWorkflowPolicy, err := currentWorkflow.SuppressBy(
targetWorkflow,
)
if err != nil {
return err
}
if err := targetWorkflow.Revive(); err != nil {
return err
}
return currentWorkflow.GetContext().UpdateWorkflowExecutionWithNew(
ctx,
r.shardContext,
persistence.UpdateWorkflowModeUpdateCurrent,
targetWorkflow.GetContext(),
targetWorkflow.GetMutableState(),
currentWorkflowPolicy,
workflow.TransactionPolicyPassive.Ptr(),
)
}
func (r *nDCTransactionMgrForNewWorkflowImpl) executeTransaction(
ctx context.Context,
transactionPolicy nDCTransactionPolicy,
currentWorkflow Workflow,
targetWorkflow Workflow,
) (retError error) {
defer func() {
if rec := recover(); rec != nil {
r.cleanupTransaction(currentWorkflow, targetWorkflow, errPanic)
panic(rec)
} else {
r.cleanupTransaction(currentWorkflow, targetWorkflow, retError)
}
}()
switch transactionPolicy {
case nDCTransactionPolicyCreateAsCurrent:
return r.createAsCurrent(
ctx,
currentWorkflow,
targetWorkflow,
)
case nDCTransactionPolicyCreateAsZombie:
return r.createAsZombie(
ctx,
currentWorkflow,
targetWorkflow,
)
case nDCTransactionPolicySuppressCurrentAndCreateAsCurrent:
return r.suppressCurrentAndCreateAsCurrent(
ctx,
currentWorkflow,
targetWorkflow,
)
default:
return serviceerror.NewInternal(fmt.Sprintf("transactionMgr: encountered unknown transaction type: %v", transactionPolicy))
}
}
func (r *nDCTransactionMgrForNewWorkflowImpl) cleanupTransaction(
currentWorkflow Workflow,
targetWorkflow Workflow,
err error,
) {
if currentWorkflow != nil {
currentWorkflow.GetReleaseFn()(err)
}
if targetWorkflow != nil {
targetWorkflow.GetReleaseFn()(err)
}
}