// Package pgservicefile is a parser for PostgreSQL service files (e.g. .pg_service.conf).
package pgservicefile
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"strings"
)
type Service struct {
Name string
Settings map[string]string
}
type Servicefile struct {
Services []*Service
servicesByName map[string]*Service
}
// GetService returns the named service.
func (sf *Servicefile) GetService(name string) (*Service, error) {
service, present := sf.servicesByName[name]
if !present {
return nil, errors.New("not found")
}
return service, nil
}
// ReadServicefile reads the file at path and parses it into a Servicefile.
func ReadServicefile(path string) (*Servicefile, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
return ParseServicefile(f)
}
// ParseServicefile reads r and parses it into a Servicefile.
func ParseServicefile(r io.Reader) (*Servicefile, error) {
servicefile := &Servicefile{}
var service *Service
scanner := bufio.NewScanner(r)
lineNum := 0
for scanner.Scan() {
lineNum += 1
line := scanner.Text()
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
// ignore comments and empty lines
} else if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
service = &Service{Name: line[1 : len(line)-1], Settings: make(map[string]string)}
servicefile.Services = append(servicefile.Services, service)
} else if service != nil {
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("unable to parse line %d", lineNum)
}
key := strings.TrimSpace(parts[0])
value := strings.TrimSpace(parts[1])
service.Settings[key] = value
} else {
return nil, fmt.Errorf("line %d is not in a section", lineNum)
}
}
servicefile.servicesByName = make(map[string]*Service, len(servicefile.Services))
for _, service := range servicefile.Services {
servicefile.servicesByName[service.Name] = service
}
return servicefile, scanner.Err()
}
