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package main
import (
"errors"
"net/url"
"os"
"path"
"regexp"
"strings"
"github.com/colinmarc/hdfs/v2"
)
var (
errMultipleNamenodeUrls = errors.New("Multiple namenode URLs specified")
)
func userDir(client *hdfs.Client) string {
return path.Join("/user", client.User())
}
// normalizePaths parses the hosts out of HDFS URLs, and turns relative paths
// into absolute ones (by appending /user/<user>). If multiple HDFS urls with
// differing hosts are passed in, it returns an error.
func normalizePaths(paths []string) ([]string, string, error) {
namenode := ""
cleanPaths := make([]string, 0, len(paths))
for _, rawurl := range paths {
url, err := url.Parse(rawurl)
if err != nil {
return nil, "", err
}
if url.Host != "" {
if namenode != "" && namenode != url.Host {
return nil, "", errMultipleNamenodeUrls
}
namenode = url.Host
}
cleanPaths = append(cleanPaths, path.Clean(url.Path))
}
return cleanPaths, namenode, nil
}
func getClientAndExpandedPaths(paths []string) ([]string, *hdfs.Client, error) {
paths, nn, err := normalizePaths(paths)
if err != nil {
return nil, nil, err
}
client, err := getClient(nn)
if err != nil {
return nil, nil, err
}
expanded, err := expandPaths(client, paths)
if err != nil {
return nil, nil, err
}
return expanded, client, nil
}
// TODO: not really sure checking for a leading \ is the way to test for
// escapedness.
func hasGlob(fragment string) bool {
match, _ := regexp.MatchString(`([^\\]|^)[[*?]`, fragment)
return match
}
// expandGlobs recursively expands globs in a filepath. It assumes the paths
// are already cleaned and normalized (ie, absolute).
func expandGlobs(client *hdfs.Client, globbedPath string) ([]string, error) {
parts := strings.Split(globbedPath, "/")[1:]
var res []string
var splitAt int
for splitAt = range parts {
if hasGlob(parts[splitAt]) {
break
}
}
var base, glob, next, remainder string
base = "/" + path.Join(parts[:splitAt]...)
glob = parts[splitAt]
if len(parts) > splitAt+1 {
next = parts[splitAt+1]
remainder = path.Join(parts[splitAt+2:]...)
} else {
next = ""
remainder = ""
}
list, err := client.ReadDir(base)
if err != nil {
return nil, err
}
for _, fi := range list {
match, _ := path.Match(glob, fi.Name())
if !match {
continue
}
newPath := path.Join(base, fi.Name(), next, remainder)
if hasGlob(newPath) {
if fi.IsDir() {
children, err := expandGlobs(client, newPath)
if err != nil {
return nil, err
}
res = append(res, children...)
}
} else {
_, err := client.Stat(newPath)
if os.IsNotExist(err) {
continue
} else if err != nil {
return nil, err
}
res = append(res, newPath)
}
}
return res, nil
}
func expandPaths(client *hdfs.Client, paths []string) ([]string, error) {
var res []string
home := userDir(client)
for _, p := range paths {
if !path.IsAbs(p) {
p = path.Join(home, p)
}
if hasGlob(p) {
expanded, err := expandGlobs(client, p)
if err != nil {
return nil, err
} else if len(expanded) == 0 {
// Fake a PathError for consistency.
return nil, &os.PathError{"stat", p, os.ErrNotExist}
}
res = append(res, expanded...)
} else {
res = append(res, p)
}
}
return res, nil
}
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