feat(backend): move comp logic to workflow params

backend/src/v2/compiler/argocompiler/argo.go

@@ -15,12 +15,16 @@
 package argocompiler
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"strings"
 
 	wfapi "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
 	"github.com/kubeflow/pipelines/api/v2alpha1/go/pipelinespec"
 	"github.com/kubeflow/pipelines/backend/src/v2/compiler"
+	log "github.com/sirupsen/logrus"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/structpb"
 	k8score "k8s.io/api/core/v1"
@@ -63,7 +67,7 @@ func Compile(jobArg *pipelinespec.PipelineJob, kubernetesSpecArg *pipelinespec.S
 	if err != nil {
 		return nil, err
 	}
-	// fill root component default paramters to PipelineJob
+	// fill root component default parameters to PipelineJob
 	specParams := spec.GetRoot().GetInputDefinitions().GetParameters()
 	for name, param := range specParams {
 		_, ok := job.RuntimeConfig.ParameterValues[name]
@@ -108,6 +112,9 @@ func Compile(jobArg *pipelinespec.PipelineJob, kubernetesSpecArg *pipelinespec.S
 					"pipelines.kubeflow.org/v2_component": "true",
 				},
 			},
+			Arguments: wfapi.Arguments{
+				Parameters: []wfapi.Parameter{},
+			},
 			ServiceAccountName: "pipeline-runner",
 			Entrypoint:         tmplEntrypoint,
 		},
@@ -180,69 +187,134 @@ func (c *workflowCompiler) templateName(componentName string) string {
 	return componentName
 }
 
-// WIP: store component spec, task spec and executor spec in annotations
-
 const (
-	annotationComponents     = "pipelines.kubeflow.org/components-"
-	annotationContainers     = "pipelines.kubeflow.org/implementations-"
-	annotationKubernetesSpec = "pipelines.kubeflow.org/kubernetes-"
+	argumentsComponents     = "components-"
+	argumentsContainers     = "implementations-"
+	argumentsKubernetesSpec = "kubernetes-"
 )
 
 func (c *workflowCompiler) saveComponentSpec(name string, spec *pipelinespec.ComponentSpec) error {
-	return c.saveProtoToAnnotation(annotationComponents+name, spec)
+	hashedComponent := c.hashComponentContainer(name)
+
+	return c.saveProtoToArguments(argumentsComponents+hashedComponent, spec)
 }
 
 // useComponentSpec returns a placeholder we can refer to the component spec
 // in argo workflow fields.
 func (c *workflowCompiler) useComponentSpec(name string) (string, error) {
-	return c.annotationPlaceholder(annotationComponents + name)
+	hashedComponent := c.hashComponentContainer(name)
+
+	return c.argumentsPlaceholder(argumentsComponents + hashedComponent)
 }
 
 func (c *workflowCompiler) saveComponentImpl(name string, msg proto.Message) error {
-	return c.saveProtoToAnnotation(annotationContainers+name, msg)
+	hashedComponent := c.hashComponentContainer(name)
+
+	return c.saveProtoToArguments(argumentsContainers+hashedComponent, msg)
 }
 
 func (c *workflowCompiler) useComponentImpl(name string) (string, error) {
-	return c.annotationPlaceholder(annotationContainers + name)
+	hashedComponent := c.hashComponentContainer(name)
+
+	return c.argumentsPlaceholder(argumentsContainers + hashedComponent)
 }
 
 func (c *workflowCompiler) saveKubernetesSpec(name string, spec *structpb.Struct) error {
-	return c.saveProtoToAnnotation(annotationKubernetesSpec+name, spec)
+	return c.saveProtoToArguments(argumentsKubernetesSpec+name, spec)
 }
 
 func (c *workflowCompiler) useKubernetesImpl(name string) (string, error) {
-	return c.annotationPlaceholder(annotationKubernetesSpec + name)
+	return c.argumentsPlaceholder(argumentsKubernetesSpec + name)
 }
 
-// TODO(Bobgy): sanitize component name
-func (c *workflowCompiler) saveProtoToAnnotation(name string, msg proto.Message) error {
+// saveProtoToArguments saves a proto message to the workflow arguments. The
+// message is serialized to JSON and stored in the workflow arguments and then
+// referenced by the workflow templates using AWF templating syntax. The reason
+// for storing it in the workflow arguments is because there is a 1-many
+// relationship between components and tasks that reference them. The workflow
+// arguments allow us to deduplicate the component logic (implementation & spec
+// in IR), significantly reducing the size of the argo workflow manifest.
+func (c *workflowCompiler) saveProtoToArguments(componentName string, msg proto.Message) error {
 	if c == nil {
 		return fmt.Errorf("compiler is nil")
 	}
-	if c.wf.Annotations == nil {
-		c.wf.Annotations = make(map[string]string)
+	if c.wf.Spec.Arguments.Parameters == nil {
+		c.wf.Spec.Arguments = wfapi.Arguments{Parameters: []wfapi.Parameter{}}
 	}
-	if _, alreadyExists := c.wf.Annotations[name]; alreadyExists {
-		return fmt.Errorf("annotation %q already exists", name)
+	if c.wf.Spec.Arguments.GetParameterByName(componentName) != nil {
+		return nil
 	}
 	json, err := stablyMarshalJSON(msg)
 	if err != nil {
-		return fmt.Errorf("saving component spec of %q to annotations: %w", name, err)
+		return fmt.Errorf("saving component spec of %q to arguments: %w", componentName, err)
 	}
-	// TODO(Bobgy): verify name adheres to Kubernetes annotation restrictions: https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/#syntax-and-character-set
-	c.wf.Annotations[name] = json
+	c.wf.Spec.Arguments.Parameters = append(c.wf.Spec.Arguments.Parameters, wfapi.Parameter{
+		Name:  componentName,
+		Value: wfapi.AnyStringPtr(json),
+	})
 	return nil
 }
 
-func (c *workflowCompiler) annotationPlaceholder(name string) (string, error) {
+// argumentsPlaceholder checks for the unique component name within the workflow
+// arguments and returns a template tag that references the component in the
+// workflow arguments.
+func (c *workflowCompiler) argumentsPlaceholder(componentName string) (string, error) {
 	if c == nil {
 		return "", fmt.Errorf("compiler is nil")
 	}
-	if _, exists := c.wf.Annotations[name]; !exists {
-		return "", fmt.Errorf("using component spec: failed to find annotation %q", name)
+	if c.wf.Spec.Arguments.GetParameterByName(componentName) == nil {
+		return "", fmt.Errorf("using component spec: failed to find workflow parameter %q", componentName)
+	}
+
+	return workflowParameter(componentName), nil
+}
+
+// hashComponentContainer serializes and hashes the container field of a given
+// component.
+func (c *workflowCompiler) hashComponentContainer(componentName string) string {
+	log.Debug("componentName: ", componentName)
+	// Return early for root component since it has no command and args.
+	if componentName == "root" {
+		return componentName
 	}
-	// Reference: https://argoproj.github.io/argo-workflows/variables/
-	return fmt.Sprintf("{{workflow.annotations.%s}}", name), nil
+	if c.executors != nil { // Don't bother if there are no executors in the pipeline spec.
+		// Look up the executorLabel for the component in question.
+		executorLabel := c.spec.Components[componentName].GetExecutorLabel()
+		log.Debug("executorLabel: ", executorLabel)
+		// Iterate through the list of executors.
+		for executorName, executorValue := range c.executors {
+			log.Debug("executorName: ", executorName)
+			// If one of them matches the executorLabel we extracted earlier...
+			if executorName == executorLabel {
+				// Get the corresponding container.
+				container := executorValue.GetContainer()
+				if container != nil {
+					containerHash, err := hashValue(container)
+					if err != nil {
+						// Do not bubble up since this is not a breaking error
+						// and we can just return the componentName in full.
+						log.Debug("Error hashing container: ", err)
+					}
+
+					return containerHash
+				}
+			}
+		}
+	}
+
+	return componentName
+}
+
+// hashValue serializes and hashes a provided value.
+func hashValue(value interface{}) (string, error) {
+	bytes, err := json.Marshal(value)
+	if err != nil {
+		return "", err
+	}
+	h := sha256.New()
+	h.Write([]byte(bytes))
+
+	return hex.EncodeToString(h.Sum(nil)), nil
 }
 
 const (

backend/src/v2/compiler/argocompiler/container.go

@@ -358,9 +358,11 @@ func (c *workflowCompiler) addContainerExecutorTemplate(refName string) string {
 		},
 	}
 	// Update pod metadata if it defined in the Kubernetes Spec
-	if kubernetesConfigString, ok := c.wf.Annotations[annotationKubernetesSpec+refName]; ok {
+	kubernetesConfigParam := c.wf.Spec.Arguments.GetParameterByName(argumentsKubernetesSpec + refName)
+
+	if kubernetesConfigParam != nil {
 		k8sExecCfg := &kubernetesplatform.KubernetesExecutorConfig{}
-		if err := jsonpb.UnmarshalString(kubernetesConfigString, k8sExecCfg); err == nil {
+		if err := jsonpb.UnmarshalString(string(*kubernetesConfigParam.Value), k8sExecCfg); err == nil {
 			extendPodMetadata(&executor.Metadata, k8sExecCfg)
 		}
 	}