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simplifying dirhash to 64bit integer

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This commit is contained in:
Chris Lu 2018-05-26 21:24:03 -07:00
parent 955eae3500
commit 87b3b84471
3 changed files with 40 additions and 14 deletions
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10
weed/filer2/abstract_sql/abstract_sql_store.go
View file

@ -21,7 +21,7 @@ func (store *AbstractSqlStore) InsertEntry(entry *filer2.Entry) (err error) {
}
res, err := store.DB.Exec("INSERT INTO filemeta (dirhash,name,directory,meta) VALUES(?,?,?,?)",
md5hash(dir), name, dir, meta)
hashToLong(dir), name, dir, meta)
if err != nil {
return fmt.Errorf("mysql insert %s: %s", entry.FullPath, err)
}
@ -42,7 +42,7 @@ func (store *AbstractSqlStore) UpdateEntry(entry *filer2.Entry) (err error) {
}
res, err := store.DB.Exec("UPDATE filemeta SET meta=? WHERE dirhash=? AND name=? AND directory=?",
meta, md5hash(dir), name, dir)
meta, hashToLong(dir), name, dir)
if err != nil {
return fmt.Errorf("mysql update %s: %s", entry.FullPath, err)
}
@ -58,7 +58,7 @@ func (store *AbstractSqlStore) FindEntry(fullpath filer2.FullPath) (*filer2.Entr
dir, name := fullpath.DirAndName()
row := store.DB.QueryRow("SELECT meta FROM filemeta WHERE dirhash=? AND name=? AND directory=?",
md5hash(dir), name, dir)
hashToLong(dir), name, dir)
var data []byte
if err := row.Scan(&data); err != nil {
return nil, fmt.Errorf("mysql read entry %s: %v", fullpath, err)
@ -81,7 +81,7 @@ func (store *AbstractSqlStore) DeleteEntry(fullpath filer2.FullPath) (*filer2.En
dir, name := fullpath.DirAndName()
res, err := store.DB.Exec("DELETE FROM filemeta WHERE dirhash=? AND name=? AND directory=?",
md5hash(dir), name, dir)
hashToLong(dir), name, dir)
if err != nil {
return nil, fmt.Errorf("mysql delete %s: %s", fullpath, err)
}
@ -101,7 +101,7 @@ func (store *AbstractSqlStore) ListDirectoryEntries(fullpath filer2.FullPath, st
sqlText = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>=? AND directory=? LIMIT ?"
}
rows, err := store.DB.Query(sqlText, md5hash(string(fullpath)), startFileName, string(fullpath), limit)
rows, err := store.DB.Query(sqlText, hashToLong(string(fullpath)), startFileName, string(fullpath), limit)
if err != nil {
return nil, fmt.Errorf("mysql list %s : %v", fullpath, err)
}

25
weed/filer2/abstract_sql/hashing.go
View file

@ -5,9 +5,28 @@ import (
"io"
)
// returns a 128 bit hash
func md5hash(dir string) []byte {
// returns a 64 bit big int
func hashToLong(dir string) (v int64) {
h := md5.New()
io.WriteString(h, dir)
return h.Sum(nil)
b := h.Sum(nil)
v += int64(b[0])
v <<= 8
v += int64(b[1])
v <<= 8
v += int64(b[2])
v <<= 8
v += int64(b[3])
v <<= 8
v += int64(b[4])
v <<= 8
v += int64(b[5])
v <<= 8
v += int64(b[6])
v <<= 8
v += int64(b[7])
return
}

19
weed/filer2/configuration.go
View file

@ -27,9 +27,9 @@ dir = "." # directory to store level db files
# need to manually create a table "filemeta".
#
# CREATE TABLE IF NOT EXISTS filemeta (
# dirhash BINARY(16) COMMENT 'MD5 hash value of directory field',
# name VARCHAR(1000) NOT NULL DEFAULT "" COMMENT 'directory or file name',
# directory VARCHAR(4096) NOT NULL DEFAULT "" COMMENT 'full path to parent directory',
# dirhash BIGINT COMMENT 'first 64 bits of MD5 hash value of directory field',
# name VARCHAR(1000) COMMENT 'directory or file name',
# directory VARCHAR(4096) COMMENT 'full path to parent directory',
# meta BLOB,
# PRIMARY KEY (dirhash, name)
# ) DEFAULT CHARSET=utf8;
@ -44,10 +44,17 @@ connection_max_idle = 2
connection_max_open = 100
[postgres]
# CREATE TABLE IF NOT EXISTS filemeta (
# dirhash BIGINT,
# name VARCHAR(1000),
# directory VARCHAR(4096),
# meta bytea,
# PRIMARY KEY (dirhash, name)
# );
enabled = false
server = "192.168.1.1"
port = 8080
username = ""
server = "localhost"
port = 5432
username = "postgres"
password = ""
database = ""
connection_max_idle = 100