source: code/trunk/config/config.go@ 321

package config

import (
        "bufio"
        "fmt"
        "io"
        "os"

        "github.com/google/shlex"
)

type TLS struct {
        CertPath, KeyPath string
}

type Server struct {
        Listen    []string
        Hostname  string
        TLS       *TLS
        SQLDriver string
        SQLSource string
        LogPath   string
}

func Defaults() *Server {
        hostname, err := os.Hostname()
        if err != nil {
                hostname = "localhost"
        }
        return &Server{
                Hostname:  hostname,
                SQLDriver: "sqlite3",
                SQLSource: "soju.db",
        }
}

func Load(path string) (*Server, error) {
        f, err := os.Open(path)
        if err != nil {
                return nil, err
        }
        defer f.Close()

        return Parse(f)
}

func Parse(r io.Reader) (*Server, error) {
        scanner := bufio.NewScanner(r)

        var directives []directive
        for scanner.Scan() {
                words, err := shlex.Split(scanner.Text())
                if err != nil {
                        return nil, fmt.Errorf("failed to parse config file: %v", err)
                } else if len(words) == 0 {
                        continue
                }

                name, params := words[0], words[1:]
                directives = append(directives, directive{name, params})
        }
        if err := scanner.Err(); err != nil {
                return nil, fmt.Errorf("failed to read config file: %v", err)
        }

        srv := Defaults()
        for _, d := range directives {
                switch d.Name {
                case "listen":
                        var uri string
                        if err := d.parseParams(&uri); err != nil {
                                return nil, err
                        }
                        srv.Listen = append(srv.Listen, uri)
                case "hostname":
                        if err := d.parseParams(&srv.Hostname); err != nil {
                                return nil, err
                        }
                case "tls":
                        tls := &TLS{}
                        if err := d.parseParams(&tls.CertPath, &tls.KeyPath); err != nil {
                                return nil, err
                        }
                        srv.TLS = tls
                case "sql":
                        if err := d.parseParams(&srv.SQLDriver, &srv.SQLSource); err != nil {
                                return nil, err
                        }
                case "log":
                        if err := d.parseParams(&srv.LogPath); err != nil {
                                return nil, err
                        }
                default:
                        return nil, fmt.Errorf("unknown directive %q", d.Name)
                }
        }

        return srv, nil
}

type directive struct {
        Name   string
        Params []string
}

func (d *directive) parseParams(out ...*string) error {
        if len(d.Params) != len(out) {
                return fmt.Errorf("directive %q has wrong number of parameters: expected %v, got %v", d.Name, len(out), len(d.Params))
        }
        for i := range out {
                *out[i] = d.Params[i]
        }
        return nil
}