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operation.go
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operation.go
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package dispatch
import (
"context"
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"github.com/antonmedv/expr"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc/metadata"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
wfv1 "github.com/argoproj/argo/pkg/apis/workflow/v1alpha1"
"github.com/argoproj/argo/server/auth"
"github.com/argoproj/argo/util/instanceid"
"github.com/argoproj/argo/util/labels"
"github.com/argoproj/argo/workflow/common"
"github.com/argoproj/argo/workflow/creator"
)
type Operation struct {
ctx context.Context
eventRecorder record.EventRecorder
instanceIDService instanceid.Service
events []wfv1.WorkflowEventBinding
env map[string]interface{}
}
func NewOperation(ctx context.Context, instanceIDService instanceid.Service, eventRecorder record.EventRecorder, events []wfv1.WorkflowEventBinding, namespace, discriminator string, payload *wfv1.Item) (*Operation, error) {
env, err := expressionEnvironment(ctx, namespace, discriminator, payload)
if err != nil {
return nil, fmt.Errorf("failed to create workflow template expression environment: %w", err)
}
return &Operation{
ctx: ctx,
eventRecorder: eventRecorder,
instanceIDService: instanceIDService,
events: events,
env: env,
}, nil
}
func (o *Operation) Dispatch() {
log.Debug("Executing event dispatch")
data, _ := json.MarshalIndent(o.env, "", " ")
log.Debugln(string(data))
for _, event := range o.events {
// we use a predicable suffix for the name so that lost connections cannot result in the same workflow being created twice
// being created twice
nameSuffix := fmt.Sprintf("%v", time.Now().Unix())
err := wait.ExponentialBackoff(retry.DefaultRetry, func() (bool, error) {
_, err := o.dispatch(event, nameSuffix)
return err == nil, err
})
if err != nil {
log.WithError(err).WithFields(log.Fields{"namespace": event.Namespace, "event": event.Name}).Error("failed to dispatch from event")
o.eventRecorder.Event(&event, corev1.EventTypeWarning, "WorkflowEventBindingError", "failed to dispatch event: "+err.Error())
}
}
}
func (o *Operation) dispatch(wfeb wfv1.WorkflowEventBinding, nameSuffix string) (*wfv1.Workflow, error) {
selector := wfeb.Spec.Event.Selector
result, err := expr.Eval(selector, o.env)
if err != nil {
return nil, fmt.Errorf("failed to evaluate workflow template expression: %w", err)
}
matched, boolExpr := result.(bool)
log.WithFields(log.Fields{"namespace": wfeb.Namespace, "event": wfeb.Name, "selector": selector, "matched": matched, "boolExpr": boolExpr}).Debug("Selector evaluation")
submit := wfeb.Spec.Submit
if !boolExpr {
return nil, errors.New("malformed workflow template expression: did not evaluate to boolean")
} else if matched && submit != nil {
client := auth.GetWfClient(o.ctx)
ref := wfeb.Spec.Submit.WorkflowTemplateRef
var tmpl wfv1.WorkflowSpecHolder
var err error
if ref.ClusterScope {
tmpl, err = client.ArgoprojV1alpha1().ClusterWorkflowTemplates().Get(ref.Name, metav1.GetOptions{})
} else {
tmpl, err = client.ArgoprojV1alpha1().WorkflowTemplates(wfeb.Namespace).Get(ref.Name, metav1.GetOptions{})
}
if err != nil {
return nil, fmt.Errorf("failed to get workflow template: %w", err)
}
err = o.instanceIDService.Validate(tmpl)
if err != nil {
return nil, fmt.Errorf("failed to validate workflow template instanceid: %w", err)
}
wf := common.NewWorkflowFromWorkflowTemplate(tmpl.GetName(), tmpl.GetWorkflowMetadata(), ref.ClusterScope)
o.instanceIDService.Label(wf)
// make sure we have a predicable name, so re-creation doesn't create two workflows
wf.SetName(wf.GetGenerateName() + nameSuffix)
// users will always want to know why a workflow was submitted,
// so we label with creator (which is a standard) and the name of the triggering event
creator.Label(o.ctx, wf)
labels.Label(wf, common.LabelKeyWorkflowEventBinding, wfeb.Name)
if submit.Arguments != nil {
for _, p := range submit.Arguments.Parameters {
if p.ValueFrom == nil {
return nil, fmt.Errorf("malformed workflow template parameter \"%s\": validFrom is nil", p.Name)
}
result, err := expr.Eval(p.ValueFrom.Event, o.env)
if err != nil {
return nil, fmt.Errorf("failed to evaluate workflow template parameter \"%s\" expression: %w", p.Name, err)
}
wf.Spec.Arguments.Parameters = append(wf.Spec.Arguments.Parameters, wfv1.Parameter{Name: p.Name, Value: wfv1.AnyStringPtr(result)})
}
}
wf, err = client.ArgoprojV1alpha1().Workflows(wfeb.Namespace).Create(wf)
if err != nil {
return nil, fmt.Errorf("failed to create workflow: %w", err)
}
return wf, nil
}
return nil, nil
}
func expressionEnvironment(ctx context.Context, namespace, discriminator string, payload *wfv1.Item) (map[string]interface{}, error) {
src := map[string]interface{}{
"namespace": namespace,
"discriminator": discriminator,
"metadata": metaData(ctx),
"payload": payload,
}
data, err := json.Marshal(src)
if err != nil {
return nil, err
}
env := make(map[string]interface{})
return env, json.Unmarshal(data, &env)
}
func metaData(ctx context.Context) map[string]interface{} {
meta := make(map[string]interface{})
md, _ := metadata.FromIncomingContext(ctx)
for k, v := range md {
// only allow headers `X-` headers, e.g. `X-Github-Action`
// otherwise, deny, e.g. deny `authorization` as this would leak security credentials
if strings.HasPrefix(k, "x-") {
meta[k] = v
}
}
return meta
}