Created
December 1, 2015 13:15
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This program extracts all parameters in the specified PostgreSQL's configuration file which are located under the specified base directory.
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| package main | |
| import ( | |
| "bufio" | |
| "fmt" | |
| "io/ioutil" | |
| "os" | |
| "regexp" | |
| "strings" | |
| ) | |
| func getConfParams(basedir, file string, params map[string]string) error { | |
| confFile := basedir + "/" + file | |
| fp, err := os.Open(confFile) | |
| if err != nil { | |
| return err | |
| } | |
| defer fp.Close() | |
| rep_inc, _ := regexp.Compile("^include\\s+") | |
| rep_incdir, _ := regexp.Compile("^include_dir\\s+") | |
| scanner := bufio.NewScanner(fp) | |
| for scanner.Scan() { | |
| s := scanner.Text() | |
| if rep_inc.MatchString(s) { | |
| s = regexp.MustCompile("include").ReplaceAllString(s, "") | |
| s = strings.Trim(strings.TrimRight(strings.TrimSpace(s), "\n"), "'") | |
| if err = getConfParams(basedir, s, params); err != nil { | |
| return err | |
| } | |
| } else if rep_incdir.MatchString(s) { | |
| s = regexp.MustCompile("include_dir").ReplaceAllString(s, "") | |
| s = strings.Trim(strings.TrimRight(strings.TrimSpace(s), "\n"), "'") | |
| files, _ := ioutil.ReadDir(basedir + "/" + s) | |
| for _, f := range files { | |
| if err = getConfParams(basedir+"/"+s, f.Name(), params); err != nil { | |
| return err | |
| } | |
| } | |
| } else { | |
| pf1 := "^\\s*[#]*\\s*[\\w\\/\\-]+\\s*=\\s*\\'[\\w\\/\\.\\,\\-\\%\\s*\\$\\:\\!\\+\"]*\\'" | |
| pf2 := "^\\s*[#]*\\s*[\\w\\/\\-]+\\s*=\\s*[\\w\\/\\.\\,\\-]+" | |
| pformats := []string{pf1, pf2} | |
| for _, v := range pformats { | |
| if match, _ := regexp.MatchString(v, s); match == true { | |
| // Delete ^# | |
| if match, _ = regexp.MatchString("^\\s*#", s); match == true { | |
| s = strings.TrimLeft(s, "#") | |
| } | |
| line := strings.Split(s, "#") // Delete comment | |
| pv := strings.Split(line[0], "=") // Get param and value | |
| pv[0] = strings.TrimSpace(pv[0]) | |
| pv[1] = strings.TrimSpace(pv[1]) | |
| params[pv[0]] = pv[1] | |
| } | |
| } | |
| } | |
| } | |
| if err := scanner.Err(); err != nil { | |
| return err | |
| } | |
| exceptions := []string{"TB", "GB", "MB", "name", "d"} // These are examples described in the default postgresql.conf. | |
| for _, v := range exceptions { | |
| if _, ex := params[v]; ex == true { | |
| delete(params, v) | |
| } | |
| } | |
| return nil | |
| } | |
| func main() { | |
| if len(os.Args) != 2 { | |
| fmt.Printf("Syntax Error!\n") | |
| fmt.Printf("Usage: %s baseDir\n\n", os.Args[0]) | |
| fmt.Printf("\tbaseDir: PostgreSQL's base directory, e.g. \"/usr/local/pgsql/data\"\n") | |
| return | |
| } | |
| params := map[string]string{} | |
| if err := getConfParams(os.Args[1], "postgresql.conf", params); err == nil { | |
| for k, v := range params { | |
| fmt.Printf("%s = %s\n", k, v) | |
| } | |
| } else { | |
| fmt.Printf("Error: %v\n", err) | |
| } | |
| if strings.ToLower(strings.Trim(params["hot_standby"], "'")) == "on" { | |
| fmt.Printf("hot_standby = on\n") | |
| } else { | |
| fmt.Printf("hot_standby = off OR not defined\n") | |
| } | |
| } |
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