Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/filemanager/workflows/worfklows.go

@@ -0,0 +1,62 @@
+package workflows
+
+import (
+	"context"
+	"fmt"
+	"path"
+	"strconv"
+	"time"
+
+	"github.com/cloudreve/Cloudreve/v4/application/dependency"
+	"github.com/cloudreve/Cloudreve/v4/inventory/types"
+	"github.com/cloudreve/Cloudreve/v4/pkg/cluster"
+	"github.com/cloudreve/Cloudreve/v4/pkg/queue"
+	"github.com/cloudreve/Cloudreve/v4/pkg/util"
+)
+
+const (
+	TaskTempPath                 = "fm_workflows"
+	slaveProgressRefreshInterval = 5 * time.Second
+)
+
+type NodeState struct {
+	NodeID int `json:"node_id"`
+
+	progress queue.Progresses
+}
+
+// allocateNode allocates a node for the task.
+func allocateNode(ctx context.Context, dep dependency.Dep, state *NodeState, capability types.NodeCapability) (cluster.Node, error) {
+	np, err := dep.NodePool(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get node pool: %w", err)
+	}
+
+	node, err := np.Get(ctx, capability, state.NodeID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get node: %w", err)
+	}
+
+	state.NodeID = node.ID()
+	return node, nil
+}
+
+// prepareSlaveTaskCtx prepares the context for the slave task.
+func prepareSlaveTaskCtx(ctx context.Context, props *types.SlaveTaskProps) context.Context {
+	ctx = context.WithValue(ctx, cluster.SlaveNodeIDCtx{}, strconv.Itoa(props.NodeID))
+	ctx = context.WithValue(ctx, cluster.MasterSiteUrlCtx{}, props.MasterSiteURl)
+	ctx = context.WithValue(ctx, cluster.MasterSiteVersionCtx{}, props.MasterSiteVersion)
+	ctx = context.WithValue(ctx, cluster.MasterSiteIDCtx{}, props.MasterSiteID)
+	return ctx
+}
+
+func prepareTempFolder(ctx context.Context, dep dependency.Dep, t queue.Task) (string, error) {
+	settings := dep.SettingProvider()
+	tempPath := util.DataPath(path.Join(settings.TempPath(ctx), TaskTempPath, strconv.Itoa(t.ID())))
+	if err := util.CreatNestedFolder(tempPath); err != nil {
+		return "", fmt.Errorf("failed to create temp folder: %w", err)
+	}
+
+	dep.Logger().Info("Temp folder created: %s", tempPath)
+	return tempPath, nil
+}