telegraf/plugins/mysql/parse_dsn.go

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// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package mysql
import (
"errors"
"strings"
)
// parseDSN parses the DSN string to a config
func parseDSN(dsn string) (string, error) {
//var user, passwd string
var addr, net string
// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
// Find the last '/' (since the password or the net addr might contain a '/')
for i := len(dsn) - 1; i >= 0; i-- {
if dsn[i] == '/' {
var j, k int
// left part is empty if i <= 0
if i > 0 {
// [username[:password]@][protocol[(address)]]
// Find the last '@' in dsn[:i]
for j = i; j >= 0; j-- {
if dsn[j] == '@' {
// username[:password]
// Find the first ':' in dsn[:j]
for k = 0; k < j; k++ {
if dsn[k] == ':' {
//passwd = dsn[k+1 : j]
break
}
}
//user = dsn[:k]
break
}
}
// [protocol[(address)]]
// Find the first '(' in dsn[j+1:i]
for k = j + 1; k < i; k++ {
if dsn[k] == '(' {
// dsn[i-1] must be == ')' if an address is specified
if dsn[i-1] != ')' {
if strings.ContainsRune(dsn[k+1:i], ')') {
return "", errors.New("Invalid DSN unescaped")
}
return "", errors.New("Invalid DSN Addr")
}
addr = dsn[k+1 : i-1]
break
}
}
net = dsn[j+1 : k]
}
break
}
}
// Set default network if empty
if net == "" {
net = "tcp"
}
// Set default address if empty
if addr == "" {
switch net {
case "tcp":
addr = "127.0.0.1:3306"
case "unix":
addr = "/tmp/mysql.sock"
default:
return "", errors.New("Default addr for network '" + net + "' unknown")
}
}
return addr, nil
}