/
mongo_cache.go
152 lines (119 loc) · 3.07 KB
/
mongo_cache.go
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package bikage
import (
"errors"
"log"
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
)
type MongoCache struct {
session *mgo.Session
}
func NewMongoCache(mongo_url string) (*MongoCache, error) {
if mongo_url == "" {
return nil, errors.New("mongo url is empty")
}
session, err := mgo.Dial(mongo_url)
if err != nil {
return nil, err
}
session.SetSafe(&mgo.Safe{})
username_index := mgo.Index{
Key: []string{"username"},
Unique: false,
DropDups: false,
Background: true,
Sparse: true,
}
session.DB("").C("trips").EnsureIndex(username_index)
trip_id_index := mgo.Index{
Key: []string{"username", "trip.id"},
Unique: true,
DropDups: true,
Background: true,
Sparse: true,
}
session.DB("").C("trips").EnsureIndex(trip_id_index)
return &MongoCache{session}, nil
}
type CachedRoute struct {
Id bson.ObjectId `bson:"_id"`
From uint64 `bson:"from"`
To uint64 `bson:"to"`
Distance uint64 `bson:"distance"`
}
func NewCachedRoute(route Route, distance uint64) CachedRoute {
return CachedRoute{
Id: bson.NewObjectId(),
From: route.From.Id,
To: route.To.Id,
Distance: distance,
}
}
func (c *MongoCache) GetDistance(route Route) (uint64, bool) {
var cached CachedRoute
s := c.session.Clone()
defer s.Close()
query := bson.M{"from": route.From.Id, "to": route.To.Id}
err := s.DB("").C("routes").Find(query).One(&cached)
if err != nil {
log.Println("MongoCache: GET error -> ", query, err)
return 0, false
}
return cached.Distance, true
}
func (c *MongoCache) PutDistance(route Route, distance uint64) {
s := c.session.Clone()
defer s.Close()
err := s.DB("").C("routes").Insert(NewCachedRoute(route, distance))
if err != nil && !mgo.IsDup(err) {
log.Println("MongoCache: PUT error -> ", err)
}
}
type CachedTrip struct {
MgoId bson.ObjectId `bson:"_id"`
Username string
Trip
}
func NewCachedTrip(username string, trip Trip) CachedTrip {
return CachedTrip{
MgoId: bson.NewObjectId(),
Username: username,
Trip: trip,
}
}
func (c *MongoCache) GetTrip(username, id string) (Trip, bool) {
var cached CachedTrip
s := c.session.Clone()
defer s.Close()
query := bson.M{"username": username, "trip.id": id}
err := s.DB("").C("trips").Find(query).One(&cached)
if err != nil {
log.Println("MongoCache: GET error -> ", query, err)
return Trip{}, false
}
return cached.Trip, true
}
func (c *MongoCache) GetTrips(username string) Trips {
var cached []CachedTrip
s := c.session.Clone()
defer s.Close()
query := bson.M{"username": username}
err := s.DB("").C("trips").Find(query).All(&cached)
trips := make(Trips, 0)
if err != nil {
log.Println("MongoCache: GET error -> ", query, err)
return trips
}
for _, trip := range cached {
trips = append(trips, trip.Trip)
}
return trips
}
func (c *MongoCache) PutTrip(username string, trip Trip) {
s := c.session.Clone()
defer s.Close()
err := s.DB("").C("trips").Insert(NewCachedTrip(username, trip))
if err != nil && !mgo.IsDup(err) {
log.Println("MongoCache: PUT error -> ", err)
}
}