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walker.go
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walker.go
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// Copyright 2018-2021 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package walker
import (
"context"
"path/filepath"
provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
"github.com/cs3org/reva/v2/pkg/errtypes"
"github.com/cs3org/reva/v2/pkg/rgrpc/todo/pool"
)
// WalkFunc is the type of function called by Walk to visit each file or directory
//
// Each time the Walk function meet a file/folder path is set to the full path of this.
// The err argument reports an error related to the path, and the function can decide the action to
// do with this.
//
// The error result returned by the function controls how Walk continues. If the function returns the special value SkipDir, Walk skips the current directory.
// Otherwise, if the function returns a non-nil error, Walk stops entirely and returns that error.
type WalkFunc func(wd string, info *provider.ResourceInfo, err error) error
// Walker is an interface implemented by objects that are able to walk from a dir rooted into the passed path
type Walker interface {
// Walk walks the file tree rooted at root, calling fn for each file or folder in the tree, including the root.
Walk(ctx context.Context, root *provider.ResourceId, fn WalkFunc) error
}
type revaWalker struct {
gatewaySelector pool.Selectable[gateway.GatewayAPIClient]
}
// NewWalker creates a Walker object that uses the reva gateway
func NewWalker(gatewaySelector pool.Selectable[gateway.GatewayAPIClient]) Walker {
return &revaWalker{gatewaySelector: gatewaySelector}
}
// Walk walks the file tree rooted at root, calling fn for each file or folder in the tree, including the root.
func (r *revaWalker) Walk(ctx context.Context, root *provider.ResourceId, fn WalkFunc) error {
info, err := r.stat(ctx, root)
if err != nil {
return fn("", nil, err)
}
err = r.walkRecursively(ctx, "", info, fn)
if err == filepath.SkipDir {
return nil
}
return err
}
func (r *revaWalker) walkRecursively(ctx context.Context, wd string, info *provider.ResourceInfo, fn WalkFunc) error {
if info.Type != provider.ResourceType_RESOURCE_TYPE_CONTAINER {
return fn(wd, info, nil)
}
list, err := r.readDir(ctx, info.Id)
errFn := fn(wd, info, err)
if err != nil || errFn != nil {
return errFn
}
for _, file := range list {
err = r.walkRecursively(ctx, filepath.Join(wd, info.Path), file, fn)
if err != nil && (file.Type != provider.ResourceType_RESOURCE_TYPE_CONTAINER || err != filepath.SkipDir) {
return err
}
}
return nil
}
func (r *revaWalker) readDir(ctx context.Context, id *provider.ResourceId) ([]*provider.ResourceInfo, error) {
gatewayClient, err := r.gatewaySelector.Next()
if err != nil {
return nil, err
}
resp, err := gatewayClient.ListContainer(ctx, &provider.ListContainerRequest{Ref: &provider.Reference{ResourceId: id, Path: "."}})
switch {
case err != nil:
return nil, err
case resp.Status.Code != rpc.Code_CODE_OK:
return nil, errtypes.NewErrtypeFromStatus(resp.Status)
}
return resp.Infos, nil
}
func (r *revaWalker) stat(ctx context.Context, id *provider.ResourceId) (*provider.ResourceInfo, error) {
gatewayClient, err := r.gatewaySelector.Next()
if err != nil {
return nil, err
}
resp, err := gatewayClient.Stat(ctx, &provider.StatRequest{Ref: &provider.Reference{ResourceId: id, Path: "."}})
switch {
case err != nil:
return nil, err
case resp.Status.Code != rpc.Code_CODE_OK:
return nil, errtypes.NewErrtypeFromStatus(resp.Status)
}
return resp.Info, nil
}