Created
February 2, 2021 17:16
-
-
Save Songmu/87bcbb69a63012b1f017fb008c708afc to your computer and use it in GitHub Desktop.
embed comment into sql
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| func findCaller() (*runtime.Frame, string) { | |
| // skip starts 6. 0: Callers, 1: findCaller, 2: sqlComment, 3: hooks, 4: proxy-funcs, 5: database/sql, and equals or greater than 6: user-funcs | |
| skip := 6 | |
| for { | |
| var rpc [8]uintptr | |
| var i int | |
| n := runtime.Callers(skip, rpc[:]) | |
| frames := runtime.CallersFrames(rpc[:]) | |
| for i = 0; ; i++ { | |
| frame, more := frames.Next() | |
| if !more { | |
| break | |
| } | |
| name := frame.Function | |
| if name == "" || strings.HasPrefix(name, "runtime.") { | |
| continue | |
| } | |
| // http://stackoverflow.com/questions/25262754/how-to-get-name-of-current-package-in-go | |
| dotIdx := 0 | |
| for j := len(name) - 1; j >= 0; j-- { | |
| if name[j] == '.' { | |
| dotIdx = j | |
| } else if name[j] == '/' { | |
| break | |
| } | |
| } | |
| packageName := name[:dotIdx] | |
| if !skipForSQLComment(frame, packageName) { | |
| return &frame, packageName | |
| } | |
| } | |
| if n < len(rpc) { | |
| break | |
| } | |
| skip += i | |
| } | |
| return nil, "" | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| sql.Register("sql-proxy", proxy.NewProxy(&mysql.MySQLDriver{}, &proxy.HooksContext{ | |
| PrePrepare: func(ctx context.Context, stmt *proxy.Stmt) (interface{}, error) { | |
| sqlComment(stmt) | |
| return nil, nil | |
| }, | |
| PreExec: func(ctx context.Context, stmt *proxy.Stmt, _ []driver.NamedValue) (interface{}, error) { | |
| if stmt.Stmt == nil { | |
| sqlComment(stmt) | |
| } | |
| return nil, nil | |
| }, | |
| PreQuery: func(ctx context.Context, stmt *proxy.Stmt, _ []driver.NamedValue) (interface{}, error) { | |
| if stmt.Stmt == nil { | |
| sqlComment(stmt) | |
| } | |
| return nil, nil | |
| }, | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| func sqlComment(stmt *proxy.Stmt) { | |
| f, pkgName := findCaller() | |
| if f != nil { | |
| fname := filepath.Base(f.File) | |
| relPath := strings.TrimPrefix(pkgName, "github.com/owner/myprojrepo/") | |
| comment := fmt.Sprintf("%s/%s:%d", relPath, fname, f.Line) | |
| comment = strings.ReplaceAll(comment, "*", "") | |
| stmt.QueryString = fmt.Sprintf("/* %s */\n%s", comment, stmt.QueryString) | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
It seems that you are referring to a particular Go file (findCaller.go) in the Songmu project or directory. If you need help with this file granny, please provide additional details or indicate what you need help with, such as troubleshooting, code review, or comprehending its operation.