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podspec.go
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podspec.go
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// Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package state
import (
"github.com/juju/errors"
"github.com/juju/mgo/v3"
"github.com/juju/mgo/v3/txn"
"github.com/juju/names/v4"
"github.com/juju/juju/core/leadership"
)
type containerSpecDoc struct {
// Id holds container spec document key.
// It is the global key of the application represented
// by this container.
Id string `bson:"_id"`
Spec string `bson:"spec"`
// RawSpec is the raw format of k8s spec.
RawSpec string `bson:"raw-spec"`
UpgradeCounter int `bson:"upgrade-counter"`
}
// SetPodSpec sets the pod spec for the given application tag while making sure
// that the caller is the leader by validating the provided token. For cases
// where leadership checks are not important (e.g. migrations), a nil Token can
// be provided to bypass the leadership checks.
//
// An error will be returned if the specified application is not alive or the
// leadership check fails.
func (m *CAASModel) SetPodSpec(token leadership.Token, appTag names.ApplicationTag, spec *string) error {
modelOp := m.SetPodSpecOperation(token, appTag, spec)
return m.st.ApplyOperation(modelOp)
}
// SetPodSpecOperation returns a ModelOperation for updating a PodSpec. For
// cases where leadership checks are not important (e.g. migrations), a nil
// Token can be provided to bypass the leadership checks.
func (m *CAASModel) SetPodSpecOperation(token leadership.Token, appTag names.ApplicationTag, spec *string) ModelOperation {
return newSetPodSpecOperation(m, token, appTag, spec)
}
// SetRawK8sSpecOperation returns a ModelOperation for updating a raw k8s spec. For
// cases where leadership checks are not important (e.g. migrations), a nil
// Token can be provided to bypass the leadership checks.
func (m *CAASModel) SetRawK8sSpecOperation(token leadership.Token, appTag names.ApplicationTag, spec *string) ModelOperation {
return newSetRawK8sSpecOperation(m, token, appTag, spec)
}
// RawK8sSpec returns the raw k8s spec for the given application tag.
func (m *CAASModel) RawK8sSpec(appTag names.ApplicationTag) (string, error) {
info, err := m.podInfo(appTag)
if err != nil {
return "", errors.Trace(err)
}
return info.RawSpec, nil
}
// PodSpec returns the pod spec for the given application tag.
func (m *CAASModel) PodSpec(appTag names.ApplicationTag) (string, error) {
info, err := m.podInfo(appTag)
if err != nil {
return "", errors.Trace(err)
}
return info.Spec, nil
}
func (m *CAASModel) podInfo(appTag names.ApplicationTag) (*containerSpecDoc, error) {
var doc containerSpecDoc
if err := readPodInfo(m.mb.db(), appTag.Id(), &doc); err != nil {
return nil, err
}
return &doc, nil
}
func readPodInfo(db Database, appName string, doc interface{}) error {
coll, cleanup := db.GetCollection(podSpecsC)
defer cleanup()
if err := coll.FindId(applicationGlobalKey(appName)).One(doc); err != nil {
if err == mgo.ErrNotFound {
return errors.NotFoundf("k8s spec for application %s", appName)
}
return errors.Trace(err)
}
return nil
}
func removePodSpecOp(appTag names.ApplicationTag) txn.Op {
return txn.Op{
C: podSpecsC,
Id: applicationGlobalKey(appTag.Id()),
Remove: true,
}
}