mirror of https://github.com/octoleo/restic.git
Add walker for trees in the repo
This commit is contained in:
Alexander Neumann
parent
14aead94b3
commit
3a86f4852b
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package walker
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package walker
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import (
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"context"
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"path"
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"sort"
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"github.com/pkg/errors"
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"github.com/restic/restic/internal/restic"
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)
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// TreeLoader loads a tree from a repository.
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type TreeLoader interface {
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LoadTree(context.Context, restic.ID) (*restic.Tree, error)
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}
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// SkipNode is returned by WalkFunc when a dir node should not be walked.
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var SkipNode = errors.New("skip this node")
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// WalkFunc is the type of the function called for each node visited by Walk.
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// Path is the slash-separated path from the root node. If there was a problem
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// loading a node, err is set to a non-nil error. WalkFunc can chose to ignore
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// it by returning nil.
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//
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// When the special value SkipNode is returned and node is a dir node, it is
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// not walked. When the node is not a dir node, the remaining items in this
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// tree are skipped.
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//
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// Setting ignore to true tells Walk that it should not visit the node again.
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// For tree nodes, this means that the function is not called for the
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// referenced tree. If the node is not a tree, and all nodes in the current
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// tree have ignore set to true, the current tree will not be visited again.
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// When err is not nil and different from SkipNode, the value returned for
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// ignore is ignored.
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type WalkFunc func(path string, node *restic.Node, nodeErr error) (ignore bool, err error)
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// Walk calls walkFn recursively for each node in root. If walkFn returns an
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// error, it is passed up the call stack. The trees in ignoreTrees are not
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// walked. If walkFn ignores trees, these are added to the set.
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func Walk(ctx context.Context, repo TreeLoader, root restic.ID, ignoreTrees restic.IDSet, walkFn WalkFunc) error {
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tree, err := repo.LoadTree(ctx, root)
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_, err = walkFn("/", nil, err)
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if err != nil {
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if err == SkipNode {
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err = nil
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}
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return err
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}
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_, err = walk(ctx, repo, "/", tree, ignoreTrees, walkFn)
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return err
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}
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// walk recursively traverses the tree, ignoring subtrees when the ID of the
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// subtree is in ignoreTrees. If err is nil and ignore is true, the subtree ID
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// will be added to ignoreTrees by walk.
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func walk(ctx context.Context, repo TreeLoader, prefix string, tree *restic.Tree, ignoreTrees restic.IDSet, walkFn WalkFunc) (ignore bool, err error) {
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var allNodesIgnored = true
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sort.Slice(tree.Nodes, func(i, j int) bool {
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return tree.Nodes[i].Name < tree.Nodes[j].Name
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})
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for _, node := range tree.Nodes {
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p := path.Join(prefix, node.Name)
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if node.Type == "" {
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return false, errors.Errorf("node type is empty for node %q", node.Name)
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}
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if node.Type != "dir" {
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ignore, err := walkFn(p, node, nil)
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if err != nil {
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if err == SkipNode {
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// skip the remaining entries in this tree
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return allNodesIgnored, nil
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}
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return false, err
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}
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if ignore == false {
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allNodesIgnored = false
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}
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continue
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}
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if node.Subtree == nil {
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return false, errors.Errorf("subtree for node %v in tree %v is nil", node.Name, p)
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}
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if ignoreTrees.Has(*node.Subtree) {
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continue
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}
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subtree, err := repo.LoadTree(ctx, *node.Subtree)
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ignore, err := walkFn(p, node, err)
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if err != nil {
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if err == SkipNode {
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if ignore {
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ignoreTrees.Insert(*node.Subtree)
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}
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continue
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}
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return false, err
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}
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if ignore {
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ignoreTrees.Insert(*node.Subtree)
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}
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if !ignore {
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allNodesIgnored = false
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}
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ignore, err = walk(ctx, repo, p, subtree, ignoreTrees, walkFn)
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if err != nil {
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return false, err
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}
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if ignore {
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ignoreTrees.Insert(*node.Subtree)
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}
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if !ignore {
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allNodesIgnored = false
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}
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}
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return allNodesIgnored, nil
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}
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@ -0,0 +1,423 @@
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package walker
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import (
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"context"
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"encoding/json"
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"fmt"
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"testing"
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"github.com/pkg/errors"
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"github.com/restic/restic/internal/restic"
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)
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// TestTree is used to construct a list of trees for testing the walker.
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type TestTree map[string]interface{}
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// TestNode is used to test the walker.
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type TestFile struct{}
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func BuildTreeMap(tree TestTree) (m TreeMap, root restic.ID) {
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m = TreeMap{}
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id := buildTreeMap(tree, m)
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return m, id
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}
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func buildTreeMap(tree TestTree, m TreeMap) restic.ID {
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res := restic.NewTree()
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for name, item := range tree {
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switch elem := item.(type) {
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case TestFile:
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res.Insert(&restic.Node{
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Name: name,
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Type: "file",
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})
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case TestTree:
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id := buildTreeMap(elem, m)
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res.Insert(&restic.Node{
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Name: name,
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Subtree: &id,
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Type: "dir",
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})
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default:
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panic(fmt.Sprintf("invalid type %T", elem))
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}
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}
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buf, err := json.Marshal(res)
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if err != nil {
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panic(err)
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}
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id := restic.Hash(buf)
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if _, ok := m[id]; !ok {
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m[id] = res
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}
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return id
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}
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// TreeMap returns the trees from the map on LoadTree.
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type TreeMap map[restic.ID]*restic.Tree
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func (t TreeMap) LoadTree(ctx context.Context, id restic.ID) (*restic.Tree, error) {
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tree, ok := t[id]
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if !ok {
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return nil, errors.New("tree not found")
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}
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return tree, nil
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}
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// checkFunc returns a function suitable for walking the tree to check
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// something, and a function which will check the final result.
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type checkFunc func(t testing.TB) (walker WalkFunc, final func(testing.TB))
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// checkItemOrder ensures that the order of the 'path' arguments is the one passed in as 'want'.
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func checkItemOrder(want []string) checkFunc {
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pos := 0
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return func(t testing.TB) (walker WalkFunc, final func(testing.TB)) {
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walker = func(path string, node *restic.Node, err error) (bool, error) {
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if err != nil {
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t.Errorf("error walking %v: %v", path, err)
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return false, err
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}
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if pos >= len(want) {
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t.Errorf("additional unexpected path found: %v", path)
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return false, nil
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}
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if path != want[pos] {
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t.Errorf("wrong path found, want %q, got %q", want[pos], path)
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}
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pos++
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return false, nil
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}
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final = func(t testing.TB) {
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if pos != len(want) {
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t.Errorf("not enough items returned, want %d, got %d", len(want), pos)
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}
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}
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return walker, final
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}
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}
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// checkSkipFor returns SkipNode if path is in skipFor, it checks that the
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// paths the walk func is called for are exactly the ones in wantPaths.
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func checkSkipFor(skipFor map[string]struct{}, wantPaths []string) checkFunc {
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var pos int
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return func(t testing.TB) (walker WalkFunc, final func(testing.TB)) {
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walker = func(path string, node *restic.Node, err error) (bool, error) {
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if err != nil {
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t.Errorf("error walking %v: %v", path, err)
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return false, err
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}
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if pos >= len(wantPaths) {
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t.Errorf("additional unexpected path found: %v", path)
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return false, nil
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}
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if path != wantPaths[pos] {
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t.Errorf("wrong path found, want %q, got %q", wantPaths[pos], path)
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}
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pos++
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if _, ok := skipFor[path]; ok {
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return false, SkipNode
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}
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return false, nil
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}
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final = func(t testing.TB) {
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if pos != len(wantPaths) {
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t.Errorf("wrong number of paths returned, want %d, got %d", len(wantPaths), pos)
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}
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}
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return walker, final
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}
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}
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// checkIgnore returns SkipNode if path is in skipFor and sets ignore according
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// to ignoreFor. It checks that the paths the walk func is called for are exactly
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// the ones in wantPaths.
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func checkIgnore(skipFor map[string]struct{}, ignoreFor map[string]bool, wantPaths []string) checkFunc {
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var pos int
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return func(t testing.TB) (walker WalkFunc, final func(testing.TB)) {
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walker = func(path string, node *restic.Node, err error) (bool, error) {
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if err != nil {
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t.Errorf("error walking %v: %v", path, err)
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return false, err
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}
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if pos >= len(wantPaths) {
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t.Errorf("additional unexpected path found: %v", path)
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return ignoreFor[path], nil
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}
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if path != wantPaths[pos] {
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t.Errorf("wrong path found, want %q, got %q", wantPaths[pos], path)
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}
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pos++
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if _, ok := skipFor[path]; ok {
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return ignoreFor[path], SkipNode
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}
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return ignoreFor[path], nil
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}
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final = func(t testing.TB) {
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if pos != len(wantPaths) {
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t.Errorf("wrong number of paths returned, want %d, got %d", len(wantPaths), pos)
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}
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}
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return walker, final
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}
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}
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func TestWalker(t *testing.T) {
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var tests = []struct {
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tree TestTree
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checks []checkFunc
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}{
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{
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tree: TestTree{
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"foo": TestFile{},
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"subdir": TestTree{
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"subfile": TestFile{},
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},
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},
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checks: []checkFunc{
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checkItemOrder([]string{
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"/",
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"/foo",
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"/subdir",
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"/subdir/subfile",
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}),
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checkSkipFor(
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map[string]struct{}{
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"/subdir": struct{}{},
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}, []string{
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"/",
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"/foo",
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"/subdir",
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},
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),
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checkIgnore(
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map[string]struct{}{}, map[string]bool{
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"/subdir": true,
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}, []string{
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"/",
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"/foo",
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"/subdir",
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"/subdir/subfile",
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},
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),
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},
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},
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{
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tree: TestTree{
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"foo": TestFile{},
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"subdir1": TestTree{
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"subfile1": TestFile{},
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},
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"subdir2": TestTree{
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"subfile2": TestFile{},
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"subsubdir2": TestTree{
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"subsubfile3": TestFile{},
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},
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},
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},
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checks: []checkFunc{
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checkItemOrder([]string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir2",
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"/subdir2/subfile2",
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"/subdir2/subsubdir2",
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"/subdir2/subsubdir2/subsubfile3",
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}),
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checkSkipFor(
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map[string]struct{}{
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"/subdir1": struct{}{},
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir2",
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"/subdir2/subfile2",
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"/subdir2/subsubdir2",
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"/subdir2/subsubdir2/subsubfile3",
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},
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),
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checkSkipFor(
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map[string]struct{}{
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"/subdir1": struct{}{},
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"/subdir2/subsubdir2": struct{}{},
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir2",
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"/subdir2/subfile2",
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"/subdir2/subsubdir2",
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},
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),
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checkSkipFor(
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map[string]struct{}{
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"/foo": struct{}{},
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}, []string{
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"/",
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"/foo",
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},
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),
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},
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},
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{
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tree: TestTree{
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"foo": TestFile{},
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"subdir1": TestTree{
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"subfile1": TestFile{},
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"subfile2": TestFile{},
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"subfile3": TestFile{},
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},
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"subdir2": TestTree{
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"subfile1": TestFile{},
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"subfile2": TestFile{},
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"subfile3": TestFile{},
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},
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"subdir3": TestTree{
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"subfile1": TestFile{},
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"subfile2": TestFile{},
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"subfile3": TestFile{},
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},
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"zzz other": TestFile{},
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},
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checks: []checkFunc{
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checkItemOrder([]string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir1/subfile2",
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"/subdir1/subfile3",
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"/subdir2",
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"/subdir2/subfile1",
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"/subdir2/subfile2",
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"/subdir2/subfile3",
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"/subdir3",
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"/subdir3/subfile1",
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"/subdir3/subfile2",
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"/subdir3/subfile3",
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"/zzz other",
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}),
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checkIgnore(
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map[string]struct{}{
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"/subdir1": struct{}{},
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}, map[string]bool{
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"/subdir1": true,
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/zzz other",
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},
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),
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checkIgnore(
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map[string]struct{}{}, map[string]bool{
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"/subdir1": true,
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir1/subfile2",
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"/subdir1/subfile3",
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"/zzz other",
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},
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),
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checkIgnore(
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map[string]struct{}{
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"/subdir2": struct{}{},
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}, map[string]bool{
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"/subdir2": true,
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir1/subfile2",
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"/subdir1/subfile3",
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"/subdir2",
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"/zzz other",
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},
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),
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checkIgnore(
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map[string]struct{}{}, map[string]bool{
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"/subdir1/subfile1": true,
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"/subdir1/subfile2": true,
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"/subdir1/subfile3": true,
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir1/subfile2",
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"/subdir1/subfile3",
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"/zzz other",
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},
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),
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checkIgnore(
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map[string]struct{}{}, map[string]bool{
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"/subdir2/subfile1": true,
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"/subdir2/subfile2": true,
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"/subdir2/subfile3": true,
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}, []string{
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"/",
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"/foo",
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"/subdir1",
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"/subdir1/subfile1",
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"/subdir1/subfile2",
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"/subdir1/subfile3",
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"/subdir2",
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"/subdir2/subfile1",
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"/subdir2/subfile2",
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"/subdir2/subfile3",
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"/zzz other",
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},
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),
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},
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},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
|
||||
repo, root := BuildTreeMap(test.tree)
|
||||
for _, check := range test.checks {
|
||||
t.Run("", func(t *testing.T) {
|
||||
ctx, cancel := context.WithCancel(context.TODO())
|
||||
defer cancel()
|
||||
|
||||
fn, last := check(t)
|
||||
err := Walk(ctx, repo, root, restic.NewIDSet(), fn)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
last(t)
|
||||
})
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue