589 lines
14 KiB
Go
589 lines
14 KiB
Go
package flow
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import (
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"context"
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"fmt"
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"path/filepath"
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"sync"
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"github.com/silas/dag"
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"go.unistack.org/micro/v3/client"
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"go.unistack.org/micro/v3/codec"
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"go.unistack.org/micro/v3/logger"
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"go.unistack.org/micro/v3/metadata"
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"go.unistack.org/micro/v3/store"
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"go.unistack.org/micro/v3/util/id"
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)
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type microFlow struct {
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opts Options
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}
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type microWorkflow struct {
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opts Options
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g *dag.AcyclicGraph
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steps map[string]Step
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id string
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status Status
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sync.RWMutex
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init bool
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}
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func (w *microWorkflow) ID() string {
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return w.id
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}
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func (w *microWorkflow) Steps() ([][]Step, error) {
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return w.getSteps("", false)
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}
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func (w *microWorkflow) Status() Status {
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return w.status
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}
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func (w *microWorkflow) AppendSteps(steps ...Step) error {
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w.Lock()
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for _, s := range steps {
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w.steps[s.String()] = s
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w.g.Add(s)
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}
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for _, dst := range steps {
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for _, req := range dst.Requires() {
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src, ok := w.steps[req]
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if !ok {
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return ErrStepNotExists
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}
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w.g.Connect(dag.BasicEdge(src, dst))
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}
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}
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if err := w.g.Validate(); err != nil {
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w.Unlock()
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return err
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}
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w.g.TransitiveReduction()
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w.Unlock()
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return nil
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}
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func (w *microWorkflow) RemoveSteps(steps ...Step) error {
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// TODO: handle case when some step requires or required by removed step
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w.Lock()
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for _, s := range steps {
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delete(w.steps, s.String())
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w.g.Remove(s)
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}
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for _, dst := range steps {
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for _, req := range dst.Requires() {
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src, ok := w.steps[req]
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if !ok {
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return ErrStepNotExists
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}
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w.g.Connect(dag.BasicEdge(src, dst))
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}
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}
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if err := w.g.Validate(); err != nil {
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w.Unlock()
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return err
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}
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w.g.TransitiveReduction()
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w.Unlock()
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return nil
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}
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func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
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var steps [][]Step
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var root dag.Vertex
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var err error
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fn := func(n dag.Vertex, idx int) error {
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if idx == 0 {
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steps = make([][]Step, 1)
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steps[0] = make([]Step, 0, 1)
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} else if idx >= len(steps) {
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tsteps := make([][]Step, idx+1)
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copy(tsteps, steps)
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steps = tsteps
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steps[idx] = make([]Step, 0, 1)
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}
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steps[idx] = append(steps[idx], n.(Step))
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return nil
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}
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if start != "" {
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var ok bool
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w.RLock()
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root, ok = w.steps[start]
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w.RUnlock()
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if !ok {
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return nil, ErrStepNotExists
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}
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} else {
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root, err = w.g.Root()
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if err != nil {
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return nil, err
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}
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}
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if reverse {
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err = w.g.SortedReverseDepthFirstWalk([]dag.Vertex{root}, fn)
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} else {
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err = w.g.SortedDepthFirstWalk([]dag.Vertex{root}, fn)
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}
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if err != nil {
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return nil, err
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}
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return steps, nil
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}
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func (w *microWorkflow) Abort(ctx context.Context, id string) error {
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workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
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return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusAborted.String())})
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}
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func (w *microWorkflow) Suspend(ctx context.Context, id string) error {
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workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
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return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusSuspend.String())})
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}
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func (w *microWorkflow) Resume(ctx context.Context, id string) error {
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workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
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return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
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}
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func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (string, error) {
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w.Lock()
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if !w.init {
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if err := w.g.Validate(); err != nil {
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w.Unlock()
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return "", err
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}
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w.g.TransitiveReduction()
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w.init = true
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}
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w.Unlock()
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eid, err := id.New()
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if err != nil {
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return "", err
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}
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stepStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("steps", eid))
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workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", eid))
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options := NewExecuteOptions(opts...)
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steps, err := w.getSteps(options.Start, options.Reverse)
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if err != nil {
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if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
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w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
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}
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return "", err
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}
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var wg sync.WaitGroup
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cherr := make(chan error, 1)
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chstatus := make(chan Status, 1)
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nctx, cancel := context.WithCancel(ctx)
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defer cancel()
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nopts := make([]ExecuteOption, 0, len(opts)+5)
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nopts = append(nopts,
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ExecuteClient(w.opts.Client),
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ExecuteTracer(w.opts.Tracer),
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ExecuteLogger(w.opts.Logger),
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ExecuteMeter(w.opts.Meter),
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)
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nopts = append(nopts, opts...)
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done := make(chan struct{})
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if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
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w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
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return eid, werr
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}
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for idx := range steps {
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for nidx := range steps[idx] {
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cstep := steps[idx][nidx]
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
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return eid, werr
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}
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}
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}
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go func() {
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for idx := range steps {
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for nidx := range steps[idx] {
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wStatus := &codec.Frame{}
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if werr := workflowStore.Read(w.opts.Context, "status", wStatus); werr != nil {
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cherr <- werr
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return
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}
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if status := StringStatus[string(wStatus.Data)]; status != StatusRunning {
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chstatus <- status
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return
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}
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if w.opts.Logger.V(logger.TraceLevel) {
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w.opts.Logger.Tracef(nctx, "will be executed %v", steps[idx][nidx])
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}
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cstep := steps[idx][nidx]
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// nolint: nestif
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if len(cstep.Requires()) == 0 {
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wg.Add(1)
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go func(step Step) {
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defer wg.Done()
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "req"), req); werr != nil {
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cherr <- werr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
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cherr <- werr
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return
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}
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rsp, serr := step.Execute(nctx, req, nopts...)
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if serr != nil {
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step.SetStatus(StatusFailure)
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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}
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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}
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cherr <- serr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), rsp); werr != nil {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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cherr <- werr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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cherr <- werr
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return
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}
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}(cstep)
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wg.Wait()
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} else {
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "req"), req); werr != nil {
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cherr <- werr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
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cherr <- werr
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return
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}
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rsp, serr := cstep.Execute(nctx, req, nopts...)
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if serr != nil {
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cstep.SetStatus(StatusFailure)
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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}
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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}
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cherr <- serr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), rsp); werr != nil {
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w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
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cherr <- werr
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return
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}
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if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
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cherr <- werr
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return
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}
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}
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}
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}
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close(done)
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}()
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if options.Async {
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return eid, nil
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}
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logger.Tracef(ctx, "wait for finish or error")
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select {
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case <-nctx.Done():
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err = nctx.Err()
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case cerr := <-cherr:
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err = cerr
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case <-done:
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close(cherr)
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case <-chstatus:
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close(chstatus)
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return eid, nil
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}
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switch {
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case nctx.Err() != nil:
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if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusAborted.String())}); werr != nil {
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w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
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}
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case err == nil:
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if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
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w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
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}
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case err != nil:
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if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil {
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w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
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}
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}
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return eid, err
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}
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// NewFlow create new flow
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func NewFlow(opts ...Option) Flow {
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options := NewOptions(opts...)
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return µFlow{opts: options}
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}
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func (f *microFlow) Options() Options {
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return f.opts
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}
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func (f *microFlow) Init(opts ...Option) error {
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for _, o := range opts {
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o(&f.opts)
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}
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if err := f.opts.Client.Init(); err != nil {
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return err
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}
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if err := f.opts.Tracer.Init(); err != nil {
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return err
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}
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if err := f.opts.Logger.Init(); err != nil {
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return err
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}
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if err := f.opts.Meter.Init(); err != nil {
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return err
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}
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if err := f.opts.Store.Init(); err != nil {
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return err
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}
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return nil
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}
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func (f *microFlow) WorkflowList(ctx context.Context) ([]Workflow, error) {
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return nil, nil
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}
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func (f *microFlow) WorkflowCreate(ctx context.Context, id string, steps ...Step) (Workflow, error) {
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w := µWorkflow{opts: f.opts, id: id, g: &dag.AcyclicGraph{}, steps: make(map[string]Step, len(steps))}
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for _, s := range steps {
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w.steps[s.String()] = s
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w.g.Add(s)
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}
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for _, dst := range steps {
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for _, req := range dst.Requires() {
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src, ok := w.steps[req]
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if !ok {
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return nil, ErrStepNotExists
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}
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w.g.Connect(dag.BasicEdge(src, dst))
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}
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}
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if err := w.g.Validate(); err != nil {
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return nil, err
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}
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w.g.TransitiveReduction()
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w.init = true
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return w, nil
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}
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func (f *microFlow) WorkflowRemove(ctx context.Context, id string) error {
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return nil
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}
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func (f *microFlow) WorkflowSave(ctx context.Context, w Workflow) error {
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return nil
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}
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func (f *microFlow) WorkflowLoad(ctx context.Context, id string) (Workflow, error) {
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return nil, nil
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}
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type microCallStep struct {
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rsp *Message
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req *Message
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service string
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method string
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opts StepOptions
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status Status
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}
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func (s *microCallStep) Request() *Message {
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return s.req
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}
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func (s *microCallStep) Response() *Message {
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return s.rsp
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}
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func (s *microCallStep) ID() string {
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return s.String()
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}
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func (s *microCallStep) Options() StepOptions {
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return s.opts
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}
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func (s *microCallStep) Endpoint() string {
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return s.method
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}
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func (s *microCallStep) Requires() []string {
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return s.opts.Requires
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}
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func (s *microCallStep) Require(steps ...Step) error {
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for _, step := range steps {
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s.opts.Requires = append(s.opts.Requires, step.String())
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}
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return nil
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}
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func (s *microCallStep) String() string {
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if s.opts.ID != "" {
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return s.opts.ID
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}
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return fmt.Sprintf("%s.%s", s.service, s.method)
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}
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func (s *microCallStep) Name() string {
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return s.String()
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}
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func (s *microCallStep) Hashcode() interface{} {
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return s.String()
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}
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func (s *microCallStep) GetStatus() Status {
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return s.status
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}
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func (s *microCallStep) SetStatus(status Status) {
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s.status = status
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}
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func (s *microCallStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
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options := NewExecuteOptions(opts...)
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if options.Client == nil {
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return nil, ErrMissingClient
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}
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rsp := &codec.Frame{}
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copts := []client.CallOption{client.WithRetries(0)}
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if options.Timeout > 0 {
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copts = append(copts,
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client.WithRequestTimeout(options.Timeout),
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client.WithDialTimeout(options.Timeout))
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}
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nctx := metadata.NewOutgoingContext(ctx, req.Header)
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err := options.Client.Call(nctx, options.Client.NewRequest(s.service, s.method, &codec.Frame{Data: req.Body}), rsp, copts...)
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if err != nil {
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return nil, err
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}
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md, _ := metadata.FromOutgoingContext(nctx)
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return &Message{Header: md, Body: rsp.Data}, err
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}
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type microPublishStep struct {
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req *Message
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rsp *Message
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topic string
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opts StepOptions
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status Status
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}
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func (s *microPublishStep) Request() *Message {
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return s.req
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}
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func (s *microPublishStep) Response() *Message {
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return s.rsp
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}
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func (s *microPublishStep) ID() string {
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return s.String()
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}
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func (s *microPublishStep) Options() StepOptions {
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return s.opts
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}
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func (s *microPublishStep) Endpoint() string {
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return s.topic
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}
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func (s *microPublishStep) Requires() []string {
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return s.opts.Requires
|
|
}
|
|
|
|
func (s *microPublishStep) Require(steps ...Step) error {
|
|
for _, step := range steps {
|
|
s.opts.Requires = append(s.opts.Requires, step.String())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *microPublishStep) String() string {
|
|
if s.opts.ID != "" {
|
|
return s.opts.ID
|
|
}
|
|
return s.topic
|
|
}
|
|
|
|
func (s *microPublishStep) Name() string {
|
|
return s.String()
|
|
}
|
|
|
|
func (s *microPublishStep) Hashcode() interface{} {
|
|
return s.String()
|
|
}
|
|
|
|
func (s *microPublishStep) GetStatus() Status {
|
|
return s.status
|
|
}
|
|
|
|
func (s *microPublishStep) SetStatus(status Status) {
|
|
s.status = status
|
|
}
|
|
|
|
func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// NewCallStep create new step with client.Call
|
|
func NewCallStep(service string, name string, method string, opts ...StepOption) Step {
|
|
options := NewStepOptions(opts...)
|
|
return µCallStep{service: service, method: name + "." + method, opts: options}
|
|
}
|
|
|
|
// NewPublishStep create new step with client.Publish
|
|
func NewPublishStep(topic string, opts ...StepOption) Step {
|
|
options := NewStepOptions(opts...)
|
|
return µPublishStep{topic: topic, opts: options}
|
|
}
|