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gitea/modules/git/tree_nogogit.go
wxiaoguang c08e42c47e
Refactor parseTreeEntries, speed up tree list (#21368)
Close #20315 (fix the panic when parsing invalid input), Speed up #20231 (use ls-tree without size field)

Introduce ListEntriesRecursiveFast (ls-tree without size) and ListEntriesRecursiveWithSize (ls-tree with size)
2022-10-08 01:20:53 +08:00

133 lines
3.2 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build !gogit
package git
import (
"io"
"math"
"strings"
)
// Tree represents a flat directory listing.
type Tree struct {
ID SHA1
ResolvedID SHA1
repo *Repository
// parent tree
ptree *Tree
entries Entries
entriesParsed bool
entriesRecursive Entries
entriesRecursiveParsed bool
}
// ListEntries returns all entries of current tree.
func (t *Tree) ListEntries() (Entries, error) {
if t.entriesParsed {
return t.entries, nil
}
if t.repo != nil {
wr, rd, cancel := t.repo.CatFileBatch(t.repo.Ctx)
defer cancel()
_, _ = wr.Write([]byte(t.ID.String() + "\n"))
_, typ, sz, err := ReadBatchLine(rd)
if err != nil {
return nil, err
}
if typ == "commit" {
treeID, err := ReadTreeID(rd, sz)
if err != nil && err != io.EOF {
return nil, err
}
_, _ = wr.Write([]byte(treeID + "\n"))
_, typ, sz, err = ReadBatchLine(rd)
if err != nil {
return nil, err
}
}
if typ == "tree" {
t.entries, err = catBatchParseTreeEntries(t, rd, sz)
if err != nil {
return nil, err
}
t.entriesParsed = true
return t.entries, nil
}
// Not a tree just use ls-tree instead
for sz > math.MaxInt32 {
discarded, err := rd.Discard(math.MaxInt32)
sz -= int64(discarded)
if err != nil {
return nil, err
}
}
for sz > 0 {
discarded, err := rd.Discard(int(sz))
sz -= int64(discarded)
if err != nil {
return nil, err
}
}
}
stdout, _, runErr := NewCommand(t.repo.Ctx, "ls-tree", "-l", t.ID.String()).RunStdBytes(&RunOpts{Dir: t.repo.Path})
if runErr != nil {
if strings.Contains(runErr.Error(), "fatal: Not a valid object name") || strings.Contains(runErr.Error(), "fatal: not a tree object") {
return nil, ErrNotExist{
ID: t.ID.String(),
}
}
return nil, runErr
}
var err error
t.entries, err = parseTreeEntries(stdout, t)
if err == nil {
t.entriesParsed = true
}
return t.entries, err
}
// listEntriesRecursive returns all entries of current tree recursively including all subtrees
// extraArgs could be "-l" to get the size, which is slower
func (t *Tree) listEntriesRecursive(extraArgs ...string) (Entries, error) {
if t.entriesRecursiveParsed {
return t.entriesRecursive, nil
}
args := append([]string{"ls-tree", "-t", "-r"}, extraArgs...)
args = append(args, t.ID.String())
stdout, _, runErr := NewCommand(t.repo.Ctx, args...).RunStdBytes(&RunOpts{Dir: t.repo.Path})
if runErr != nil {
return nil, runErr
}
var err error
t.entriesRecursive, err = parseTreeEntries(stdout, t)
if err == nil {
t.entriesRecursiveParsed = true
}
return t.entriesRecursive, err
}
// ListEntriesRecursiveFast returns all entries of current tree recursively including all subtrees, no size
func (t *Tree) ListEntriesRecursiveFast() (Entries, error) {
return t.listEntriesRecursive()
}
// ListEntriesRecursiveWithSize returns all entries of current tree recursively including all subtrees, with size
func (t *Tree) ListEntriesRecursiveWithSize() (Entries, error) {
return t.listEntriesRecursive("--long")
}