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mgo_store.go
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mgo_store.go
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package surl
import (
"errors"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"net/url"
)
const (
collection = "urls"
db = "surl"
)
// Indicates that there was an issue resolving the required collection
// from the connected MongoDB instance.
var ErrCouldNotResolveCollection = errors.New("Could not resolve collection")
// MgoStore relies on MongoDB to persist key to URL mappings.
type MgoStore struct {
session *mgo.Session
}
type Document struct {
Key string
Url *url.URL
}
func NewMgoStore(url string) (*MgoStore, error) {
if s, err := mgo.Dial(url); err != nil {
return nil, err
} else {
return &MgoStore{s}, nil
}
}
func (self *MgoStore) findCollection() *mgo.Collection {
return self.session.DB(db).C(collection)
}
func (self *MgoStore) Get(key string) (*url.URL, error) {
c := self.findCollection()
if c == nil {
return nil, ErrCouldNotResolveCollection
}
result := Document{}
err := c.Find(bson.M{"key": key}).One(&result)
if err != nil {
return nil, err
}
return result.Url, nil
}
func (self *MgoStore) Put(key string, url *url.URL) error {
c := self.findCollection()
if c == nil {
return ErrCouldNotResolveCollection
}
return c.Insert(&Document{Key: key, Url: url})
}