v0.0.125

sq/hasher.go

@@ -0,0 +1,195 @@
+package sq
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"github.com/jmoiron/sqlx"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func HashSqliteSchema(ctx context.Context, schemaStr string) (string, error) {
+	dbdir := os.TempDir()
+	dbfile1 := filepath.Join(dbdir, langext.MustHexUUID()+".sqlite3")
+
+	err := os.MkdirAll(dbdir, os.ModePerm)
+	if err != nil {
+		return "", err
+	}
+
+	url := fmt.Sprintf("file:%s?_journal=%s&_timeout=%d&_fk=%s&_busy_timeout=%d", dbfile1, "DELETE", 1000, "true", 1000)
+
+	xdb, err := sqlx.Open("sqlite3", url)
+	if err != nil {
+		return "", err
+	}
+
+	db := NewDB(xdb)
+
+	_, err = db.Exec(ctx, schemaStr, PP{})
+	if err != nil {
+		return "", err
+	}
+
+	ss, err := CreateSqliteDatabaseSchemaString(ctx, db)
+	if err != nil {
+		return "", err
+	}
+
+	cs := sha256.Sum256([]byte(ss))
+
+	return hex.EncodeToString(cs[:]), nil
+}
+
+func CreateSqliteDatabaseSchemaString(ctx context.Context, db DB) (string, error) {
+
+	type colInfo struct {
+		Name       string  `db:"name"`
+		Type       string  `db:"type"`
+		NotNull    string  `db:"notnull"`
+		Default    *string `db:"dflt_value"`
+		PrimaryKey *string `db:"pk"`
+	}
+
+	type idxInfo struct {
+		Name   string `json:"name"       db:"name"`
+		Unique int    `json:"unique"     db:"unique"`
+		Origin string `json:"origin"     db:"origin"`
+		Patial int    `json:"partial"    db:"partial"`
+	}
+
+	type fkyInfo struct {
+		TableDest string `json:"table_dest"  db:"table"`
+		From      string `json:"from"        db:"from"`
+		To        string `json:"to"          db:"to"`
+		OnUpdate  string `json:"on_update"   db:"on_update"`
+		OnDelete  string `json:"on_delete"   db:"on_delete"`
+		Match     string `json:"match"       db:"match"`
+	}
+
+	type tabInfo struct {
+		Name   string `json:"name"    db:"name"`
+		Type   string `json:"type"    db:"type"`
+		NumCol int    `json:"ncol"    db:"ncol"`
+		Strict int    `json:"strict"  db:"strict"`
+
+		ColumnInfo []colInfo `json:"-"`
+		IndexInfo  []idxInfo `json:"-"`
+		FKeyInfo   []fkyInfo `json:"-"`
+	}
+
+	rowsTableList, err := db.Query(ctx, "PRAGMA table_list;", PP{})
+	if err != nil {
+		return "", err
+	}
+	tableList, err := ScanAll[tabInfo](rowsTableList, SModeFast, Unsafe, true)
+	if err != nil {
+		return "", err
+	}
+
+	langext.SortBy(tableList, func(v tabInfo) string { return v.Name })
+
+	result := make([]tabInfo, 0)
+
+	for i, tab := range tableList {
+
+		if strings.HasPrefix(tab.Name, "sqlite_") {
+			continue
+		}
+
+		{
+
+			rowsColumnList, err := db.Query(ctx, fmt.Sprintf("PRAGMA table_info(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+
+			columnList, err := ScanAll[colInfo](rowsColumnList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(columnList, func(v colInfo) string { return v.Name })
+
+			tableList[i].ColumnInfo = columnList
+		}
+
+		{
+			rowsIdxList, err := db.Query(ctx, fmt.Sprintf("PRAGMA index_list(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+			idxList, err := ScanAll[idxInfo](rowsIdxList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(idxList, func(v idxInfo) string { return v.Name })
+
+			tableList[i].IndexInfo = idxList
+		}
+
+		{
+			rowsIdxList, err := db.Query(ctx, fmt.Sprintf("PRAGMA foreign_key_list(\"%s\");", tab.Name), PP{})
+			if err != nil {
+				return "", err
+			}
+			fkyList, err := ScanAll[fkyInfo](rowsIdxList, SModeFast, Unsafe, true)
+			if err != nil {
+				return "", err
+			}
+
+			langext.SortBy(fkyList, func(v fkyInfo) string { return v.From })
+
+			tableList[i].FKeyInfo = fkyList
+		}
+
+		result = append(result, tableList[i])
+	}
+
+	strBuilderResult := ""
+	for _, vTab := range result {
+		jbinTable, err := json.Marshal(vTab)
+		if err != nil {
+			return "", err
+		}
+
+		strBuilderResult += fmt.Sprintf("#TABLE: %s\n{\n", string(jbinTable))
+
+		for _, vCol := range vTab.ColumnInfo {
+			jbinColumn, err := json.Marshal(vCol)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    COLUMN: %s\n", string(jbinColumn))
+		}
+
+		for _, vIdx := range vTab.IndexInfo {
+			jbinIndex, err := json.Marshal(vIdx)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    INDEX:  %s\n", string(jbinIndex))
+		}
+
+		for _, vFky := range vTab.FKeyInfo {
+			jbinFKey, err := json.Marshal(vFky)
+			if err != nil {
+				return "", err
+			}
+
+			strBuilderResult += fmt.Sprintf("    FKEY:   %s\n", string(jbinFKey))
+		}
+
+		strBuilderResult += "}\n\n"
+	}
+
+	return strBuilderResult, nil
+}