seaweedfs/weed/storage/needle/needle.go

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package needle
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
"strings"
"time"
. "github.com/chrislusf/seaweedfs/weed/storage/types"
)
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const (
NeedleChecksumSize = 4
PairNamePrefix = "Seaweed-"
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)
/*
* A Needle means a uploaded and stored file.
* Needle file size is limited to 4GB for now.
*/
type Needle struct {
Cookie Cookie `comment:"random number to mitigate brute force lookups"`
Id NeedleId `comment:"needle id"`
Size uint32 `comment:"sum of DataSize,Data,NameSize,Name,MimeSize,Mime"`
DataSize uint32 `comment:"Data size"` //version2
Data []byte `comment:"The actual file data"`
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Flags byte `comment:"boolean flags"` //version2
NameSize uint8 //version2
Name []byte `comment:"maximum 256 characters"` //version2
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MimeSize uint8 //version2
Mime []byte `comment:"maximum 256 characters"` //version2
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PairsSize uint16 //version2
Pairs []byte `comment:"additional name value pairs, json format, maximum 64kB"`
LastModified uint64 //only store LastModifiedBytesLength bytes, which is 5 bytes to disk
Ttl *TTL
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Checksum CRC `comment:"CRC32 to check integrity"`
AppendAtNs uint64 `comment:"append timestamp in nano seconds"` //version3
Padding []byte `comment:"Aligned to 8 bytes"`
}
func (n *Needle) String() (str string) {
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str = fmt.Sprintf("%s Size:%d, DataSize:%d, Name:%s, Mime:%s", formatNeedleIdCookie(n.Id, n.Cookie), n.Size, n.DataSize, n.Name, n.Mime)
return
}
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func CreateNeedleFromRequest(r *http.Request, sizeLimit int64) (n *Needle, originalSize int, e error) {
n = new(Needle)
pu, e := ParseUpload(r, sizeLimit)
if e != nil {
return
}
n.Data = pu.Data
originalSize = pu.OriginalDataSize
n.LastModified = pu.ModifiedTime
n.Ttl = pu.Ttl
if len(pu.FileName) < 256 {
n.Name = []byte(pu.FileName)
n.SetHasName()
}
if len(pu.MimeType) < 256 {
n.Mime = []byte(pu.MimeType)
n.SetHasMime()
}
if len(pu.PairMap) != 0 {
trimmedPairMap := make(map[string]string)
for k, v := range pu.PairMap {
trimmedPairMap[k[len(PairNamePrefix):]] = v
}
pairs, _ := json.Marshal(trimmedPairMap)
if len(pairs) < 65536 {
n.Pairs = pairs
n.PairsSize = uint16(len(pairs))
n.SetHasPairs()
}
}
if pu.IsGzipped {
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n.SetIsCompressed()
}
if n.LastModified == 0 {
n.LastModified = uint64(time.Now().Unix())
}
n.SetHasLastModifiedDate()
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if n.Ttl != EMPTY_TTL {
n.SetHasTtl()
}
if pu.IsChunkedFile {
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n.SetIsChunkManifest()
}
n.Checksum = NewCRC(n.Data)
commaSep := strings.LastIndex(r.URL.Path, ",")
dotSep := strings.LastIndex(r.URL.Path, ".")
fid := r.URL.Path[commaSep+1:]
if dotSep > 0 {
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fid = r.URL.Path[commaSep+1 : dotSep]
}
e = n.ParsePath(fid)
return
}
func (n *Needle) ParsePath(fid string) (err error) {
length := len(fid)
if length <= CookieSize*2 {
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return fmt.Errorf("Invalid fid: %s", fid)
}
delta := ""
deltaIndex := strings.LastIndex(fid, "_")
if deltaIndex > 0 {
fid, delta = fid[0:deltaIndex], fid[deltaIndex+1:]
}
n.Id, n.Cookie, err = ParseNeedleIdCookie(fid)
if err != nil {
return err
}
if delta != "" {
if d, e := strconv.ParseUint(delta, 10, 64); e == nil {
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n.Id += Uint64ToNeedleId(d)
} else {
return e
}
}
return err
}
func ParseNeedleIdCookie(key_hash_string string) (NeedleId, Cookie, error) {
if len(key_hash_string) <= CookieSize*2 {
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return NeedleIdEmpty, 0, fmt.Errorf("KeyHash is too short.")
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}
if len(key_hash_string) > (NeedleIdSize+CookieSize)*2 {
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return NeedleIdEmpty, 0, fmt.Errorf("KeyHash is too long.")
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}
split := len(key_hash_string) - CookieSize*2
needleId, err := ParseNeedleId(key_hash_string[:split])
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if err != nil {
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return NeedleIdEmpty, 0, fmt.Errorf("Parse needleId error: %v", err)
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}
cookie, err := ParseCookie(key_hash_string[split:])
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if err != nil {
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return NeedleIdEmpty, 0, fmt.Errorf("Parse cookie error: %v", err)
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}
return needleId, cookie, nil
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}
func (n *Needle) LastModifiedString() string {
return time.Unix(int64(n.LastModified), 0).Format("2006-01-02T15:04:05")
}