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utils.go
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utils.go
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package main
import (
"os"
"io"
"io/ioutil"
"fmt"
"crypto/md5"
"strings"
"net/http"
"path/filepath"
"strconv"
"errors"
"net/url"
"time"
)
const TimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"
const AltTimeFormat = "Mon Jan 2 15:04:05 2006"
type httpRange struct {
start, end int64
}
func ReadMetadata(fd int) (map[interface{}]interface{}) {
var pickled_metadata [32768]byte
offset := 0
for index := 0; ; index += 1 {
var metadata_name string
if index == 0 {
metadata_name = "user.swift.metadata"
} else {
metadata_name = fmt.Sprintf("user.swift.metadata%d", index)
}
length := FGetXattr(fd, metadata_name, pickled_metadata[offset:])
if length <= 0 {
break
}
offset += length
}
v := PickleLoads(string(pickled_metadata[0:offset]))
return v.(map[interface{}]interface{})
}
func WriteMetadata(fd int, v map[string]interface{}) {
buf := PickleDumps(v)
for index := 0; len(buf) > 0; index++ {
var metadata_name string
if index == 0 {
metadata_name = "user.swift.metadata"
} else {
metadata_name = fmt.Sprintf("user.swift.metadata%d", index)
}
writelen := 254
if len(buf) < writelen {
writelen = len(buf)
}
FSetXattr(fd, metadata_name, []byte(buf[0:writelen]))
buf = buf[writelen:len(buf)]
}
}
func InvalidateHash(hash_dir string) {
suff_dir := filepath.Dir(hash_dir)
partition_dir := filepath.Dir(suff_dir)
pkl_file := fmt.Sprintf("%s/hashes.pkl", partition_dir)
data, err := ioutil.ReadFile(pkl_file)
if err != nil {
return
}
v := PickleLoads(string(data))
v.(map[string]interface{})[suff_dir] = nil
// TODO: tmp file, fsync, rename
ioutil.WriteFile(pkl_file, []byte(PickleDumps(v)), 0666)
}
func ObjHashDir(vars map[string]string, config ServerConfig) (string) {
h := md5.New()
io.WriteString(h, fmt.Sprintf("%s/%s/%s/%s%s", config.hash_path_prefix, vars["account"],
vars["container"], vars["obj"], config.hash_path_suffix))
hex_hash := fmt.Sprintf("%x", h.Sum(nil))
suffix := hex_hash[29:32]
return fmt.Sprintf("%s/%s/%s/%s/%s/%s", config.drive_root, vars["device"], "objects", vars["partition"], suffix, hex_hash)
}
func ObjTempDir(vars map[string]string, config ServerConfig) (string) {
return fmt.Sprintf("%s/%s/%s", config.drive_root, vars["device"], "tmp")
}
func PrimaryFile(directory string) (string) {
file_list, err := ioutil.ReadDir(directory)
if err != nil {
return ""
}
for index := len(file_list) - 1; index >= 0; index-- {
filename := file_list[index].Name()
if strings.HasSuffix(filename, ".ts") || strings.HasSuffix(filename, ".data") {
return filename
}
}
return ""
}
func CleanupHashDir(directory string) {
file_list, err := ioutil.ReadDir(directory)
if err != nil {
return
}
delete_rest := false
for index := len(file_list) - 1; index >= 0; index-- {
filename := file_list[index].Name()
if delete_rest {
os.RemoveAll(fmt.Sprintf("%s/%s", directory, filename))
} else if strings.HasSuffix(filename, ".ts") || strings.HasSuffix(filename, ".data") {
delete_rest = true
}
}
}
func Urlencode(str string) (string) {
return strings.Replace(url.QueryEscape(str), "+", "%20", -1)
}
func UpdateContainer(operation string, metadata map[string]interface{}, request *http.Request, vars map[string]string) {
client := &http.Client{}
contpartition := request.Header.Get("X-Container-Partition")
conthosts := strings.Split(request.Header.Get("X-Container-Host"), ",")
contdevices := strings.Split(request.Header.Get("X-Container-Device"), ",")
for index := range conthosts {
if conthosts[index] == "" {
break
}
host := conthosts[index]
device := contdevices[index]
url := fmt.Sprintf("http://%s/%s/%s/%s/%s/%s", host, device, contpartition,
Urlencode(vars["account"]), Urlencode(vars["container"]), Urlencode(vars["obj"]))
req, err := http.NewRequest(operation, url, nil)
if err != nil {
continue
}
req.Header.Add("X-Trans-Id", request.Header.Get("X-Trans-Id"))
req.Header.Add("X-Timestamp", metadata["X-Timestamp"].(string))
if operation != "DELETE" {
req.Header.Add("X-Content-Type", metadata["Content-Type"].(string))
req.Header.Add("X-Size", metadata["Content-Length"].(string))
req.Header.Add("X-Etag", metadata["ETag"].(string))
}
resp, err := client.Do(req)
if err != nil || (resp.StatusCode / 100) != 2 {
continue
// TODO: async update files
}
}
}
func ParseRange(range_header string, file_size int64) ([]httpRange, error) {
range_header = strings.Replace(strings.ToLower(range_header), " ", "", -1)
if !strings.HasPrefix(range_header, "bytes=") {
return nil, nil
}
range_header = range_header[6:]
var req_ranges []httpRange
range_strings := strings.Split(range_header, ",")
for _, rng := range range_strings {
beginend := strings.Split(rng, "-")
if len(beginend) != 2 || (beginend[0] == "" && beginend[1] == "") {
return nil, errors.New("invalid range format")
}
if beginend[0] == "" {
end, err := strconv.ParseInt(beginend[1], 10, 64)
if err != nil {
return nil, errors.New("invalid end with no begin")
}
if end == 0 {
return nil, errors.New("zero end with no begin")
} else if end > file_size {
req_ranges = append(req_ranges, httpRange{0, file_size})
} else {
req_ranges = append(req_ranges, httpRange{file_size - end, file_size})
}
} else if beginend[1] == "" {
begin, err := strconv.ParseInt(beginend[0], 10, 64)
if err != nil {
return nil, errors.New("invalid begin with no end")
}
if begin < file_size {
req_ranges = append(req_ranges, httpRange{begin, file_size})
} else {
continue
}
} else {
begin, err := strconv.ParseInt(beginend[0], 10, 64)
if err != nil {
return nil, errors.New("invalid begin")
}
end, err := strconv.ParseInt(beginend[1], 10, 64)
if err != nil {
return nil, errors.New("invalid end")
}
if end < begin {
return nil, errors.New("end before begin")
}
if begin > file_size {
return nil, errors.New("Begin bigger than file")
}
if end + 1 < file_size {
req_ranges = append(req_ranges, httpRange{begin, end + 1})
} else {
req_ranges = append(req_ranges, httpRange{begin, file_size})
}
}
}
return req_ranges, nil
}
func ParseDate(date_str string) (time.Time, error) {
if date_str == "" {return time.Now(), errors.New("invalid time")}
if ius, err := time.Parse(TimeFormat, date_str); err == nil {return ius, nil}
if ius, err := time.Parse(AltTimeFormat, date_str); err == nil {return ius, nil}
return time.Now(), errors.New("invalid time")
}