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quota.go
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quota.go
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// Copyright 2014 tsuru authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package auth
import (
"errors"
"github.com/globocom/tsuru/db"
"github.com/globocom/tsuru/quota"
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
)
// ReserveApp reserves an app for the user, reserving it in the database. It's
// used to reserve the app in the user quota, returning an error when there
// isn't any space available.
func ReserveApp(user *User) error {
user, err := checkUser(user.Email)
if err != nil {
return err
}
conn, err := db.Conn()
if err != nil {
return err
}
defer conn.Close()
err = conn.Users().Update(
bson.M{"email": user.Email, "quota.inuse": user.InUse},
bson.M{"$inc": bson.M{"quota.inuse": 1}},
)
for err == mgo.ErrNotFound {
user, err = checkUser(user.Email)
if err != nil {
return err
}
err = conn.Users().Update(
bson.M{"email": user.Email, "quota.inuse": user.InUse},
bson.M{"$inc": bson.M{"quota.inuse": 1}},
)
}
return err
}
func checkUser(email string) (*User, error) {
user, err := GetUserByEmail(email)
if err != nil {
return nil, err
}
if user.Quota.Limit == user.Quota.InUse {
return nil, "a.QuotaExceededError{
Available: 0, Requested: 1,
}
}
return user, nil
}
// ReleaseApp releases an app from the user list, releasing the quota spot for
// another app.
func ReleaseApp(user *User) error {
errCantRelease := errors.New("Cannot release unreserved app")
user, err := GetUserByEmail(user.Email)
if err != nil {
return err
}
if user.Quota.InUse == 0 {
return errCantRelease
}
conn, err := db.Conn()
if err != nil {
return err
}
defer conn.Close()
err = conn.Users().Update(
bson.M{"email": user.Email, "quota.inuse": user.InUse},
bson.M{"$inc": bson.M{"quota.inuse": -1}},
)
for err == mgo.ErrNotFound {
user, err = GetUserByEmail(user.Email)
if err != nil {
return err
}
if user.Quota.InUse == 0 {
return errCantRelease
}
err = conn.Users().Update(
bson.M{"email": user.Email, "quota.inuse": user.InUse},
bson.M{"$inc": bson.M{"quota.inuse": -1}},
)
}
return err
}