optimize(db): add memory cache & mutex

coder.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	sql "github.com/FloatTech/sqlite"
@@ -11,13 +12,18 @@ import (
 
 // Coder encoder/decoder
 type Coder struct {
+	mu       sync.RWMutex
 	db       sql.Sqlite
+	字表缓存     map[rune][]字表
+	部首缓存     map[rune]string
 	isRandom bool
 }
 
 // NewCoder israndom 随机挑选声母韵母的颜文字, 否则固定使用第一个
 func NewCoder(israndom bool, cachettl time.Duration) (c Coder, err error) {
 	c.db.DBPath = EmoziDatabasePath
+	c.字表缓存 = make(map[rune][]字表, 4096)
+	c.部首缓存 = make(map[rune]string, 4096)
 	c.isRandom = israndom
 	err = c.db.Open(cachettl)
 	if err != nil {
@@ -41,14 +47,16 @@ func NewCoder(israndom bool, cachettl time.Duration) (c Coder, err error) {
 
 // Close ...
 func (c *Coder) Close() error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	return c.db.Close()
 }
 
-// Encode 从汉字序列生成 EmoziString
-func (c *Coder) Encode(s string, selections ...int) (EmoziString, error) {
+// Encode 从汉字序列生成 EmoziString 返回 EmoziString 多音字选择数列表
+func (c *Coder) Encode(s string, selections ...int) (EmoziString, []int, error) {
 	sb := strings.Builder{}
-	x := &字表{}
-	lst := []字表{}
+	lstbuf := make([]字表, 0, len(s)/2)
+	var lst []字表
 	write := func(x *字表) {
 		sb.WriteString(c.查声母(x.S))
 		sb.WriteString(c.查韵母(x.Y))
@@ -56,27 +64,19 @@ func (c *Coder) Encode(s string, selections ...int) (EmoziString, error) {
 		sb.WriteString(c.查部首(x.R))
 	}
 	多音字计数 := 0
+	多音字数表 := []int{}
+	var err error
 	for _, ch := range s { // nolint: go-staticcheck
-		lst = lst[:0]
-		err := c.db.FindFor(附字表名, x, "WHERE W="+strconv.Itoa(int(ch)), func() error {
-			lst = append(lst, *x)
-			return nil
-		})
-		if err != nil {
-			lst = lst[:0]
-			err = c.db.FindFor(主字表名, x, "WHERE W="+strconv.Itoa(int(ch)), func() error {
-				lst = append(lst, *x)
-				return nil
-			})
-		}
+		lst, lstbuf, err = c.查字(ch, lstbuf)
 		if err != nil || len(lst) == 0 {
 			sb.WriteRune(ch)
 			continue
 		}
 		if len(lst) == 1 {
-			write(x)
+			write(&lst[0])
 			continue
 		}
+		多音字数表 = append(多音字数表, len(lst))
 		if len(selections) > 多音字计数 {
 			idx := selections[多音字计数]
 			多音字计数++
@@ -94,7 +94,7 @@ func (c *Coder) Encode(s string, selections ...int) (EmoziString, error) {
 		}
 		sb.WriteString("]")
 	}
-	return WrapRawEmoziString(sb.String()), nil
+	return WrapRawEmoziString(sb.String()), 多音字数表, nil
 }
 
 // Add 向主库添加一个新字
@@ -108,11 +108,13 @@ func (c *Coder) Add(w, r, p, f string) error {
 	if err != nil {
 		return err
 	}
+	c.mu.Lock()
 	err = c.db.InsertUnique(主字表名, &字表{
 		ID: 颜表ID(rw, s, y, t),
 		W:  rw, S: s, Y: y, T: t,
 		R: rr, P: p, F: f,
 	})
+	c.mu.Unlock()
 	if err != nil {
 		return errors.New("已有同音同形的字 '" + w + "'")
 	}
@@ -134,11 +136,13 @@ func (c *Coder) Overlay(w, r, p, f string) error {
 }
 
 func (c *Coder) overlay(w, p, f string, s 声母枚举, y 韵母枚举, t 声调枚举, rw rune, rr rune) error {
+	c.mu.Lock()
 	err := c.db.InsertUnique(附字表名, &字表{
 		ID: 颜表ID(rw, s, y, t),
 		W:  rw, S: s, Y: y, T: t,
 		R: rr, P: p, F: f,
 	})
+	c.mu.Unlock()
 	if err != nil {
 		return errors.New("已有同音同形的字 '" + w + "'")
 	}
@@ -158,14 +162,18 @@ func (c *Coder) ChangeOverlay(oldw, oldr, oldf, neww, newr, newf string) error {
 	}
 	q := "WHERE ID=" + strconv.FormatInt(颜表ID(rw, s, y, t), 10)
 	x := 字表{}
+	c.mu.RLock()
 	err = c.db.Find(附字表名, &x, q)
+	c.mu.RUnlock()
 	if err != nil {
 		return err
 	}
 	if x.R != rr {
 		return errors.New("提供的旧部首 '" + string(rr) + "' 与记载的 '" + string(x.R) + "' 不符")
 	}
+	c.mu.Lock()
 	err = c.db.Del(附字表名, q)
+	c.mu.Unlock()
 	if err != nil {
 		return err
 	}
@@ -174,5 +182,7 @@ func (c *Coder) ChangeOverlay(oldw, oldr, oldf, neww, newr, newf string) error {
 
 // OverlayRadical 添加一个部首
 func (c *Coder) OverlayRadical(r rune, e string) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	return c.db.InsertUnique(部首表名, &部首表{R: r, E: e})
 }