Exposed workflow priority as a variable (#1476)

Author: markterm

docs/variables.md

@@ -51,7 +51,7 @@ The following variables are made available to reference various metadata of a wo
 | `workflow.labels.<NAME>` | Workflow labels |
 | `workflow.creationTimestamp` | Workflow creation timestamp formatted in RFC 3339  (e.g. `2018-08-23T05:42:49Z`) |
 | `workflow.creationTimestamp.<STRFTIMECHAR>` | Creation timestamp formatted with a [strftime](http://strftime.org) format character |
-
+| `workflow.priority` | Workflow priority |
 
 ## Exit Handler:
 | Variable | Description|

workflow/common/common.go

@@ -109,8 +109,10 @@ const (
 	GlobalVarWorkflowUID = "workflow.uid"
 	// GlobalVarWorkflowStatus is a global workflow variable referencing the workflow's status.phase field
 	GlobalVarWorkflowStatus = "workflow.status"
-	// GlobalVarWorkflowCreationTimestamp is the workflow variable referencing the workflows metadata.creationTimestamp field
+	// GlobalVarWorkflowCreationTimestamp is the workflow variable referencing the workflow's metadata.creationTimestamp field
 	GlobalVarWorkflowCreationTimestamp = "workflow.creationTimestamp"
+	// GlobalVarWorkflowPriority is the workflow variable referencing the workflow's priority field
+	GlobalVarWorkflowPriority = "workflow.priority"
 	// LocalVarPodName is a step level variable that references the name of the pod
 	LocalVarPodName = "pod.name"
 

workflow/controller/operator.go

@@ -265,6 +265,9 @@ func (woc *wfOperationCtx) setGlobalParameters() {
 	woc.globalParams[common.GlobalVarWorkflowNamespace] = woc.wf.ObjectMeta.Namespace
 	woc.globalParams[common.GlobalVarWorkflowUID] = string(woc.wf.ObjectMeta.UID)
 	woc.globalParams[common.GlobalVarWorkflowCreationTimestamp] = woc.wf.ObjectMeta.CreationTimestamp.String()
+	if woc.wf.Spec.Priority != nil {
+		woc.globalParams[common.GlobalVarWorkflowPriority] = strconv.Itoa(int(*woc.wf.Spec.Priority))
+	}
 	for char := range strftime.FormatChars {
 		cTimeVar := fmt.Sprintf("%s.%s", common.GlobalVarWorkflowCreationTimestamp, string(char))
 		woc.globalParams[cTimeVar] = strftime.Format("%"+string(char), woc.wf.ObjectMeta.CreationTimestamp.Time)