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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // Copyright (C) 2023 Quan Chen <chenquan_act@163.com> | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package medengine | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| _ "github.com/mattn/go-sqlite3" | ||
| "github.com/op/go-logging" | ||
| "github.com/terasum/medict/internal/utils" | ||
| ) | ||
|
|
||
| var log = logging.MustGetLogger("default") | ||
|
|
||
| // CreateMeIndex creates Medict index file | ||
| // Medict words index file format: | ||
| // filename: meidx | ||
| // internal format: sqlite unzipped | ||
| // sqlite table name: meidx_keyword_index | ||
| // table columns: | ||
| // -------------------------- | ||
| // | idx_no | key_word | key_block_index | record_start_offset | record_end_offset | compressed_size | decompressed_size | dict_type | | ||
| func CreateMeIndex(idxFilePath string) error { | ||
| if utils.FileExists(idxFilePath) { | ||
| return nil | ||
| } | ||
|
|
||
| db, err := sql.Open("sqlite3", idxFilePath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer db.Close() | ||
|
|
||
| sqlStmt := ` | ||
| DROP TABLE if EXISTS meidx_keyword_index; | ||
| CREATE TABLE meidx_keyword_index ( | ||
| idx_no integer primary key autoincrement not null, | ||
| key_word varchar(512) unique, | ||
| key_block_index long , | ||
| record_start_offset long , | ||
| record_end_offset long); | ||
| -- CREATE INDEX index_meidx_keyword_index_keyword ON meidx_keyword_index(key_word); | ||
| ` | ||
| _, err = db.Exec(sqlStmt) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| // | ||
| // Copyright (C) 2023 Quan Chen <chenquan_act@163.com> | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package medengine | ||
|
|
||
| import ( | ||
| _ "github.com/mattn/go-sqlite3" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestCreateMeIndex(t *testing.T) { | ||
| err := CreateMeIndex("./testdata/testidx.meidx") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| package medengine |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| package medengine | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "github.com/silenceper/pool" | ||
| "github.com/terasum/medict/pkg/model" | ||
| "time" | ||
| ) | ||
|
|
||
| type IndexEngine struct { | ||
| indexFilePath string | ||
| connPool pool.Pool | ||
| } | ||
|
|
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| type IndexRecord struct { | ||
| keyWord string | ||
| keyBlockIndex int64 | ||
| recordStartOffset int64 | ||
| recordEndOffset int64 | ||
| } | ||
|
|
||
| func NewIndexRecord( | ||
| KeyWord string, | ||
| RecordStartOffset int64, | ||
| RecordEndOffset int64, | ||
| KeyBlockIdx int64, | ||
| ) *IndexRecord { | ||
| return &IndexRecord{ | ||
| keyWord: KeyWord, | ||
| keyBlockIndex: KeyBlockIdx, | ||
| recordStartOffset: RecordStartOffset, | ||
| recordEndOffset: RecordEndOffset, | ||
| } | ||
| } | ||
|
|
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| func (idr *IndexRecord) ToKeyBlockEntry() *model.KeyBlockEntry { | ||
| return &model.KeyBlockEntry{ | ||
| ID: 0, | ||
| RecordStartOffset: idr.recordStartOffset, | ||
| RecordEndOffset: idr.recordEndOffset, | ||
| KeyWord: idr.keyWord, | ||
| KeyBlockIdx: idr.keyBlockIndex, | ||
| } | ||
| } | ||
|
|
||
| func NewEngine(indexFilePath string) (*IndexEngine, error) { | ||
| err := CreateMeIndex(indexFilePath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| connPool, err := pool.NewChannelPool(&pool.Config{ | ||
| InitialCap: 1, | ||
| MaxCap: 3, | ||
| MaxIdle: 3, | ||
| Factory: func() (interface{}, error) { | ||
| db, err1 := sql.Open("sqlite3", indexFilePath) | ||
| if err1 != nil { | ||
| return nil, err1 | ||
| } | ||
| return db, nil | ||
| }, | ||
| Close: func(db interface{}) error { | ||
| return db.(*sql.DB).Close() | ||
| }, | ||
| Ping: func(db interface{}) error { | ||
| return nil | ||
| }, | ||
| IdleTimeout: 60 * time.Second, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &IndexEngine{ | ||
| indexFilePath: indexFilePath, | ||
| connPool: connPool, | ||
| }, nil | ||
| } | ||
|
|
||
| func (engine *IndexEngine) AddRecord(record *IndexRecord) error { | ||
| db, err := engine.Acquire() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer engine.Release(db) | ||
|
|
||
| sqlfmt := `INSERT INTO meidx_keyword_index ( | ||
| key_word, | ||
| key_block_index, | ||
| record_start_offset, | ||
| record_end_offset) | ||
| VALUES(?, ?, ?, ?)` | ||
| statement, err := db.Prepare(sqlfmt) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, err = statement.Exec(record.keyWord, record.keyBlockIndex, record.recordStartOffset, record.recordEndOffset) | ||
| return err | ||
| } | ||
|
|
||
| func (engine *IndexEngine) Search(keyword string) ([]*IndexRecord, error) { | ||
| db, err := engine.Acquire() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer engine.Release(db) | ||
|
|
||
| sqlfmt := `SELECT key_word, key_block_index, record_start_offset, record_end_offset FROM meidx_keyword_index WHERE key_word LIKE ?` | ||
| statement, err := db.Prepare(sqlfmt) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer statement.Close() | ||
| result, err := statement.Query(keyword + "%") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| results := make([]*IndexRecord, 0) | ||
| for result.Next() { | ||
| temp := new(IndexRecord) | ||
| err1 := result.Scan(&(temp.keyWord), &(temp.keyBlockIndex), &(temp.recordStartOffset), &(temp.recordEndOffset)) | ||
| if err1 != nil { | ||
| log.Errorf("sql query error %s", err1.Error()) | ||
| } | ||
| results = append(results, temp) | ||
| } | ||
| return results, nil | ||
| } | ||
|
|
||
| func (engine *IndexEngine) Acquire() (*sql.DB, error) { | ||
| db, err := engine.connPool.Get() | ||
| return db.(*sql.DB), err | ||
| } | ||
|
|
||
| func (engine *IndexEngine) Release(db *sql.DB) { | ||
| err := engine.connPool.Put(db) | ||
| if err != nil { | ||
| log.Errorf(err.Error()) | ||
| } | ||
| } | ||
|
|
||
| func (engine *IndexEngine) Close() { | ||
| engine.connPool.Release() | ||
| } |
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