refactor: remove mandatory use of collaboration

pkg/utils/dsn.go

@@ -8,122 +8,7 @@ import (
 
 // AdaptiveMysqlDsn adaptation of various mysql format dsn address
 func AdaptiveMysqlDsn(dsn string) string {
-	// remove optional scheme prefix
+	return strings.ReplaceAll(dsn, "mysql://", "")
-	dsn = strings.ReplaceAll(dsn, "mysql://", "")
-
-	dsn = ensureNetworkAddress(dsn)
-	return ensureCharsetAndCollation(dsn)
-}
-
-// helper: ensure network/address section is valid for go-sql-driver/mysql
-func ensureNetworkAddress(dsn string) string {
-    at := strings.Index(dsn, "@")
-    if at == -1 {
-        return dsn
-    }
-
-    afterAt := dsn[at+1:]
-    slashIdx := strings.Index(afterAt, "/")
-    if slashIdx == -1 {
-        return dsn
-    }
-
-    addrPart := afterAt[:slashIdx]
-    if addrPart == "" {
-        return dsn
-    }
-
-    if strings.HasPrefix(addrPart, "(") {
-        // missing protocol, add tcp
-        return strings.Replace(dsn, "@(", "@tcp(", 1)
-    }
-
-    if strings.HasPrefix(addrPart, "tcp(") || strings.HasPrefix(addrPart, "unix(") {
-        return dsn
-    }
-
-    // no parentheses and no protocol → wrap with tcp()
-    return strings.Replace(dsn, "@"+addrPart, "@tcp("+addrPart+")", 1)
-}
-
-// helper: ensure charset utf8mb4 and a reasonable collation are present
-func ensureCharsetAndCollation(dsn string) string {
-    qIdx := strings.Index(dsn, "?")
-    if qIdx == -1 {
-        return dsn + "?charset=utf8mb4"
-    }
-
-    prefix := dsn[:qIdx]
-    queryStr := dsn[qIdx+1:]
-    parts := strings.Split(queryStr, "&")
-
-    hasCharset := false
-    hasCollation := false
-    for i, p := range parts {
-        if strings.HasPrefix(p, "charset=") {
-            hasCharset = true
-            parts[i] = "charset=" + normalizeCharsets(strings.TrimPrefix(p, "charset="))
-            break
-        }
-        if strings.HasPrefix(p, "collation=") {
-            hasCollation = true
-        }
-    }
-
-    if !hasCharset {
-        parts = append(parts, "charset=utf8mb4")
-    }
-    if !hasCollation {
-        parts = append(parts, "collation=utf8mb4_general_ci")
-    }
-
-    return prefix + "?" + strings.Join(parts, "&")
-}
-
-// normalizeCharsets deduplicates a comma-separated charset list and ensures utf8mb4 is first
-func normalizeCharsets(val string) string {
-    pieces := strings.Split(val, ",")
-    seen := map[string]bool{}
-    ordered := []string{}
-    for _, cs := range pieces {
-        cs = strings.TrimSpace(cs)
-        if cs == "" {
-            continue
-        }
-        lower := strings.ToLower(cs)
-        if seen[lower] {
-            continue
-        }
-        seen[lower] = true
-        ordered = append(ordered, cs)
-    }
-
-    // ensure utf8mb4 is present and at the front (case-insensitive)
-    found := -1
-    for i, cs := range ordered {
-        if strings.EqualFold(cs, "utf8mb4") {
-            found = i
-            break
-        }
-    }
-    if found == -1 {
-        ordered = append([]string{"utf8mb4"}, ordered...)
-    } else if found != 0 {
-        // move to front
-        front := []string{"utf8mb4"}
-        for i, cs := range ordered {
-            if i == found {
-                continue
-            }
-            if strings.EqualFold(cs, "utf8mb4") {
-                continue
-            }
-            front = append(front, cs)
-        }
-        ordered = front
-    }
-
-    return strings.Join(ordered, ",")
 }
 
 // AdaptivePostgresqlDsn convert postgres dsn to kv string