/
setstatus.go
212 lines (190 loc) · 6.35 KB
/
setstatus.go
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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package common
import (
"fmt"
"time"
"github.com/juju/errors"
"github.com/juju/names/v5"
apiservererrors "github.com/juju/juju/apiserver/errors"
"github.com/juju/juju/core/leadership"
"github.com/juju/juju/core/status"
"github.com/juju/juju/rpc/params"
"github.com/juju/juju/state"
)
// ApplicationStatusSetter implements a SetApplicationStatus method to be
// used by facades that can change an application status.
// This is only slightly less evil than ApplicationStatusGetter. We have
// StatusSetter already; all this does is set the status for the wrong
// entity, and render the auth so confused as to be ~worthless.
type ApplicationStatusSetter struct {
leadershipChecker leadership.Checker
st *state.State
getCanModify GetAuthFunc
}
// NewApplicationStatusSetter returns a ServiceStatusSetter.
func NewApplicationStatusSetter(st *state.State, getCanModify GetAuthFunc, leadershipChecker leadership.Checker) *ApplicationStatusSetter {
return &ApplicationStatusSetter{
leadershipChecker: leadershipChecker,
st: st,
getCanModify: getCanModify,
}
}
// SetStatus sets the status on the service given by the unit in args if the unit is the leader.
func (s *ApplicationStatusSetter) SetStatus(args params.SetStatus) (params.ErrorResults, error) {
result := params.ErrorResults{
Results: make([]params.ErrorResult, len(args.Entities)),
}
if len(args.Entities) == 0 {
return result, nil
}
canModify, err := s.getCanModify()
if err != nil {
return params.ErrorResults{}, err
}
for i, arg := range args.Entities {
// TODO(fwereade): the auth is basically nonsense, and basically only
// works by coincidence. Read carefully.
// We "know" that arg.Tag is either the calling unit or its service
// (because getCanModify is authUnitOrService, and we'll fail out if
// it isn't); and, in practice, it's always going to be the calling
// unit (because, /sigh, we don't actually use service tags to refer
// to services in this method).
tag, err := names.ParseTag(arg.Tag)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
if !canModify(tag) {
result.Results[i].Error = apiservererrors.ServerError(apiservererrors.ErrPerm)
continue
}
unitTag, ok := tag.(names.UnitTag)
if !ok {
// No matter what the canModify says, if this entity is not
// a unit, we say "NO".
result.Results[i].Error = apiservererrors.ServerError(apiservererrors.ErrPerm)
continue
}
unitId := unitTag.Id()
// Now we have the unit, we can get the service that should have been
// specified in the first place...
serviceId, err := names.UnitApplication(unitId)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
service, err := s.st.Application(serviceId)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
// ...and set the status, conditional on the unit being (and remaining)
// service leader.
token := s.leadershipChecker.LeadershipCheck(serviceId, unitId)
// TODO(fwereade) pass token into SetStatus instead of checking here.
if err := token.Check(); err != nil {
// TODO(fwereade) this should probably be apiservererrors.ErrPerm in certain cases,
// but I don't think I implemented an exported ErrNotLeader.
// I should have done, though.
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
// TODO(perrito666) 2016-05-02 lp:1558657
now := time.Now()
sInfo := status.StatusInfo{
Status: status.Status(arg.Status),
Message: arg.Info,
Data: arg.Data,
Since: &now,
}
if err := service.SetStatus(sInfo); err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
}
}
return result, nil
}
// StatusSetter implements a common SetStatus method for use by
// various facades.
type StatusSetter struct {
st state.EntityFinder
getCanModify GetAuthFunc
}
// NewStatusSetter returns a new StatusSetter. The GetAuthFunc will be
// used on each invocation of SetStatus to determine current
// permissions.
func NewStatusSetter(st state.EntityFinder, getCanModify GetAuthFunc) *StatusSetter {
return &StatusSetter{
st: st,
getCanModify: getCanModify,
}
}
func (s *StatusSetter) setEntityStatus(tag names.Tag, entityStatus status.Status, info string, data map[string]interface{}, updated *time.Time) error {
entity, err := s.st.FindEntity(tag)
if err != nil {
return err
}
switch entity := entity.(type) {
case *state.Application:
return apiservererrors.ErrPerm
case status.StatusSetter:
sInfo := status.StatusInfo{
Status: entityStatus,
Message: info,
Data: data,
Since: updated,
}
return entity.SetStatus(sInfo)
default:
return apiservererrors.NotSupportedError(tag, fmt.Sprintf("setting status, %T", entity))
}
}
// SetStatus sets the status of each given entity.
func (s *StatusSetter) SetStatus(args params.SetStatus) (params.ErrorResults, error) {
result := params.ErrorResults{
Results: make([]params.ErrorResult, len(args.Entities)),
}
if len(args.Entities) == 0 {
return result, nil
}
canModify, err := s.getCanModify()
if err != nil {
return params.ErrorResults{}, err
}
// TODO(perrito666) 2016-05-02 lp:1558657
now := time.Now()
for i, arg := range args.Entities {
tag, err := names.ParseTag(arg.Tag)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
err = apiservererrors.ErrPerm
if canModify(tag) {
err = s.setEntityStatus(tag, status.Status(arg.Status), arg.Info, arg.Data, &now)
}
result.Results[i].Error = apiservererrors.ServerError(err)
}
return result, nil
}
// UnitAgentFinder is a state.EntityFinder that finds unit agents.
type UnitAgentFinder struct {
state.EntityFinder
}
// FindEntity implements state.EntityFinder and returns unit agents.
func (ua *UnitAgentFinder) FindEntity(tag names.Tag) (state.Entity, error) {
_, ok := tag.(names.UnitTag)
if !ok {
return nil, errors.Errorf("unsupported tag %T", tag)
}
entity, err := ua.EntityFinder.FindEntity(tag)
if err != nil {
return nil, errors.Trace(err)
}
// this returns a state.Unit, but for testing we just cast to the minimal
// interface we need.
return entity.(hasAgent).Agent(), nil
}
type hasAgent interface {
Agent() *state.UnitAgent
}