/
config.go
111 lines (95 loc) · 2.09 KB
/
config.go
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package db
import (
"bytes"
"fmt"
"html/template"
"net/url"
"strings"
"github.com/koron/nvgd/config"
)
// Param is connection parameter for the database.
type Param struct {
// Driver represents driver name for database.
Driver string `yaml:"driver"`
// Name represents driver-specific data source name.
Name string `yaml:"name"`
// MaxRows is limitation of rows.
MaxRows int `yaml:"max_rows"`
// MultipleDatabase to support multiple database in an instance.
MultipleDatabase bool `yaml:"multiple_database"`
}
// Config represents configuration for Handler.
type Config map[string]Param
var dbconfig Config
func init() {
config.RegisterProtocol("db", &dbconfig)
}
func getDBParam(name string) (*Param, error) {
p, ok := dbconfig[name]
if !ok {
return nil, fmt.Errorf("unknown database: %q", name)
}
return &p, nil
}
func (p *Param) expandName(dbname string) (string, error) {
if dbname == "" {
return p.Name, nil
}
t, err := template.New(p.Driver).Parse(p.Name)
if err != nil {
return "", err
}
t.Option("missingkey=error")
q := map[string]string{
"dbname": dbname,
}
b := &bytes.Buffer{}
err = t.Execute(b, q)
if err != nil {
return "", err
}
return b.String(), nil
}
func (p *Param) openDB(dbname string) (*conn, error) {
// rewrite with real DB name for multiple database.
if p.MultipleDatabase {
n, err := p.expandName(dbname)
if err != nil {
return nil, err
}
return connect(p.Driver, n, p.MaxRows)
}
return connect(p.Driver, p.Name, p.MaxRows)
}
func extractNames(u *url.URL) (name, dbname string) {
name = u.Hostname()
if u.User != nil {
dbname = u.User.Username()
}
return name, dbname
}
func openDB(u *url.URL) (*conn, error) {
name, dbname := extractNames(u)
p, err := getDBParam(name)
if err != nil {
return nil, err
}
c, err := p.openDB(dbname)
if err != nil {
return nil, err
}
return c, nil
}
func regulatePath(u *url.URL) string {
if strings.HasPrefix(u.Path, "/") {
return u.Path[1:]
}
return u.Path
}
func parseAsTables(u *url.URL) []string {
p := regulatePath(u)
if p == "" {
return nil
}
return strings.Split(p, ",")
}