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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package state
import (
"fmt"
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
"labix.org/v2/mgo/txn"
"launchpad.net/juju-core/constraints"
"launchpad.net/juju-core/errors"
"launchpad.net/juju-core/instance"
)
// constraintsDoc is the mongodb representation of a constraints.Value.
type constraintsDoc struct {
Arch *string
CpuCores *uint64
CpuPower *uint64
Mem *uint64
RootDisk *uint64
InstanceType *string
Container *instance.ContainerType
Tags *[]string `bson:",omitempty"`
}
func (doc constraintsDoc) value() constraints.Value {
return constraints.Value{
Arch: doc.Arch,
CpuCores: doc.CpuCores,
CpuPower: doc.CpuPower,
Mem: doc.Mem,
RootDisk: doc.RootDisk,
Container: doc.Container,
Tags: doc.Tags,
InstanceType: doc.InstanceType,
}
}
func newConstraintsDoc(cons constraints.Value) constraintsDoc {
return constraintsDoc{
Arch: cons.Arch,
CpuCores: cons.CpuCores,
CpuPower: cons.CpuPower,
Mem: cons.Mem,
RootDisk: cons.RootDisk,
Container: cons.Container,
Tags: cons.Tags,
InstanceType: cons.InstanceType,
}
}
func createConstraintsOp(st *State, id string, cons constraints.Value) txn.Op {
return txn.Op{
C: st.constraints.Name,
Id: id,
Assert: txn.DocMissing,
Insert: newConstraintsDoc(cons),
}
}
func setConstraintsOp(st *State, id string, cons constraints.Value) txn.Op {
return txn.Op{
C: st.constraints.Name,
Id: id,
Assert: txn.DocExists,
Update: bson.D{{"$set", newConstraintsDoc(cons)}},
}
}
func removeConstraintsOp(st *State, id string) txn.Op {
return txn.Op{
C: st.constraints.Name,
Id: id,
Remove: true,
}
}
func readConstraints(st *State, id string) (constraints.Value, error) {
doc := constraintsDoc{}
if err := st.constraints.FindId(id).One(&doc); err == mgo.ErrNotFound {
return constraints.Value{}, errors.NotFoundf("constraints")
} else if err != nil {
return constraints.Value{}, err
}
return doc.value(), nil
}
func writeConstraints(st *State, id string, cons constraints.Value) error {
ops := []txn.Op{setConstraintsOp(st, id, cons)}
if err := st.runTransaction(ops); err != nil {
return fmt.Errorf("cannot set constraints: %v", err)
}
return nil
}
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