feat: prefer the file-hosting node for archive tasks (#39)

Compress/extract tasks now seed the node pool's preferred slot with the
node hosting the source file's storage policy, so data-heavy work runs
where the blob already lives instead of pulling it across nodes. Falls
back to weighted selection when the policy is node-less or the node
lacks the capability.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pkg/filemanager/workflows/archive.go

@@ -125,6 +125,11 @@ func (m *CreateArchiveTask) Do(ctx context.Context) (task.Status, error) {
 	}
 	m.state = state
 
+	// Prefer the node hosting the first source file's storage policy.
+	if len(m.state.Uris) > 0 {
+		preferPolicyNode(ctx, dep, &m.state.NodeState, m.state.Uris[0])
+	}
+
 	// select node
 	node, err := allocateNode(ctx, dep, &m.state.NodeState, types.NodeCapabilityCreateArchive)
 	if err != nil {

pkg/filemanager/workflows/extract.go

@@ -126,6 +126,9 @@ func (m *ExtractArchiveTask) Do(ctx context.Context) (task.Status, error) {
 	}
 	m.state = state
 
+	// Prefer the node hosting the source file's storage policy.
+	preferPolicyNode(ctx, dep, &m.state.NodeState, m.state.Uri)
+
 	// select node
 	node, err := allocateNode(ctx, dep, &m.state.NodeState, types.NodeCapabilityExtractArchive)
 	if err != nil {

pkg/filemanager/workflows/worfklows.go

@@ -9,7 +9,11 @@ import (
 
 	"github.com/cloudreve/Cloudreve/v4/application/dependency"
 	"github.com/cloudreve/Cloudreve/v4/inventory/types"
+	"github.com/cloudreve/Cloudreve/v4/inventory"
 	"github.com/cloudreve/Cloudreve/v4/pkg/cluster"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/fs"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/fs/dbfs"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/manager"
 	"github.com/cloudreve/Cloudreve/v4/pkg/queue"
 	"github.com/cloudreve/Cloudreve/v4/pkg/util"
 )
@@ -60,3 +64,38 @@ func prepareTempFolder(ctx context.Context, dep dependency.Dep, t queue.Task) (s
 	dep.Logger().Info("Temp folder created: %s", tempPath)
 	return tempPath, nil
 }
+
+// preferPolicyNode seeds the preferred node with the node hosting the given
+// file's storage policy, so data-heavy tasks run where the blob already
+// lives. No-op when the URI is invalid, has no entity, or the policy is not
+// bound to a node — the pool then falls back to weighted selection.
+func preferPolicyNode(ctx context.Context, dep dependency.Dep, state *NodeState, uriStr string) {
+	if state.NodeID > 0 {
+		return
+	}
+
+	uri, err := fs.NewUriFromString(uriStr)
+	if err != nil {
+		return
+	}
+
+	fm := manager.NewFileManager(dep, inventory.UserFromContext(ctx))
+	defer fm.Recycle()
+
+	file, err := fm.Get(ctx, uri, dbfs.WithFileEntities())
+	if err != nil || file == nil {
+		return
+	}
+
+	entity := file.PrimaryEntity()
+	if entity == nil {
+		return
+	}
+
+	policy, err := dep.StoragePolicyClient().GetPolicyByID(ctx, entity.PolicyID())
+	if err != nil || policy == nil {
+		return
+	}
+
+	state.NodeID = policy.NodeID
+}