feat(web): initialize Next.js project with Tailwind CSS and TypeScript setup

pkg/executors/registry.go

@@ -0,0 +1,64 @@
+package executors
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/lyzrai/flow/pkg/engine"
+	"github.com/lyzrai/flow/pkg/models"
+)
+
+var (
+	registry   = map[string]NodeExecutor{}
+	registryMu sync.RWMutex
+)
+
+// Register adds a node executor for a given flow node type.
+func Register(nodeType string, executor NodeExecutor) {
+	registryMu.Lock()
+	defer registryMu.Unlock()
+	registry[nodeType] = executor
+}
+
+// Get returns the executor for a flow-native node type.
+func Get(nodeType string) (NodeExecutor, error) {
+	registryMu.RLock()
+	defer registryMu.RUnlock()
+	if e, ok := registry[nodeType]; ok {
+		return e, nil
+	}
+	return nil, fmt.Errorf("executor not implemented for node type %q", nodeType)
+}
+
+// RegistryDeps holds optional dependencies for executors that need external access.
+type RegistryDeps struct {
+	WorkflowLoader WorkflowLoaderFunc
+}
+
+// WorkflowLoaderFunc loads a workflow definition by ID from storage.
+type WorkflowLoaderFunc func(ctx context.Context, id string) (*models.WorkflowDefinition, error)
+
+// RegisterAll registers the v0.1 primitive executors.
+func RegisterAll(deps ...RegistryDeps) {
+	// Control flow / data primitives
+	Register("flow-nodes-base.trigger", &TriggerExecutor{})
+	Register("flow-nodes-base.noOp", &NoOpExecutor{})
+	Register("flow-nodes-base.set", &SetExecutor{})
+
+	// Human-in-the-loop
+	Register("flow-nodes-base.waitForApproval", &ApprovalExecutor{})
+}
+
+// BuildLookup creates an ExecutorLookup from the registered executors.
+func BuildLookup() engine.ExecutorLookup {
+	return func(nodeType string) (engine.NodeExecutorFunc, error) {
+		exec, err := Get(nodeType)
+		if err != nil {
+			return nil, err
+		}
+		return func(ctx context.Context, node models.NodeDef, inputs [][]models.Item, execCtx *engine.ExecutionContext) (map[int][]models.Item, error) {
+			return exec.Execute(ctx, node, inputs, execCtx)
+		}, nil
+	}
+}