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Pull request: 3906 filewalker read limit 

Merge in DNS/adguard-home from 3906-filewalker-constraint to master

Updates #3906.

Squashed commit of the following:

commit e1b654420a5031dbfe69d86c3fcf16a95a9ca935
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Dec 1 15:45:26 2021 +0300

    aghos: rm filewalker limit
This commit is contained in:
Eugene Burkov 2021-12-01 16:26:46 +03:00
parent b92b5fb46a
commit 9c6d139913
1 changed files with 6 additions and 18 deletions
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24
internal/aghos/filewalker.go
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@ -5,7 +5,6 @@ import (
"io"
"io/fs"
"github.com/AdguardTeam/AdGuardHome/internal/aghio"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/stringutil"
)
@ -13,18 +12,15 @@ import (
// FileWalker is the signature of a function called for files in the file tree.
// As opposed to filepath.Walk it only walk the files (not directories) matching
// the provided pattern and those returned by function itself. All patterns
// should be valid for fs.Glob. If cont is false, the walking terminates. Each
// opened file is also limited for reading to MaxWalkedFileSize.
// should be valid for fs.Glob. If FileWalker returns false for cont then
// walking terminates. Prefer using bufio.Scanner to read the r since the input
// is not limited.
//
// TODO(e.burkov, a.garipov): Move into another package like aghfs.
// TODO(e.burkov, a.garipov): Move into another package like aghfs.
//
// TODO(e.burkov): Think about passing filename or any additional data.
type FileWalker func(r io.Reader) (patterns []string, cont bool, err error)
// MaxWalkedFileSize is the maximum length of the file that FileWalker can
// check.
const MaxWalkedFileSize = 1024 * 1024
// checkFile tries to open and process a single file located on sourcePath in
// the specified fsys. The path is skipped if it's a directory.
func checkFile(
@ -48,20 +44,12 @@ func checkFile(
var fi fs.FileInfo
if fi, err = f.Stat(); err != nil {
return nil, true, err
}
if fi.IsDir() {
} else if fi.IsDir() {
// Skip the directories.
return nil, true, nil
}
var r io.Reader
// Ignore the error since LimitReader function returns error only if passed
// limit value is less than zero, but the constant used.
//
// TODO(e.burkov): Make variable.
r, _ = aghio.LimitReader(f, MaxWalkedFileSize)
return c(r)
return c(f)
}
// handlePatterns parses the patterns in fsys and ignores duplicates using