forked from juju/juju
/
status.go
208 lines (184 loc) · 6.94 KB
/
status.go
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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package uniter
import (
"github.com/juju/names/v4"
"github.com/DavinZhang/juju/apiserver/common"
apiservererrors "github.com/DavinZhang/juju/apiserver/errors"
"github.com/DavinZhang/juju/apiserver/params"
"github.com/DavinZhang/juju/core/cache"
"github.com/DavinZhang/juju/core/leadership"
"github.com/DavinZhang/juju/core/status"
"github.com/DavinZhang/juju/state"
)
// StatusAPI is the uniter part that deals with setting/getting
// status from different entities, this particular separation from
// base is because we have a shim to support unit/agent split.
type StatusAPI struct {
st *state.State
model CachedModel
leadershipChecker leadership.Checker
agentSetter *common.StatusSetter
unitSetter *common.StatusSetter
unitGetter *common.StatusGetter
applicationSetter *common.ApplicationStatusSetter
getCanModify common.GetAuthFunc
}
// CachedModel represents the methods that the StatusAPI needs on a
// model from the model cache.
type CachedModel interface {
Application(string) (CachedApplication, error)
}
// CachedApplication represents the methods that the StatusAPI needs on
// an application from the model cache.
type CachedApplication interface {
Status() status.StatusInfo
}
// NewStatusAPI creates a new server-side Status setter API facade.
func NewStatusAPI(st *state.State, model CachedModel, getCanModify common.GetAuthFunc, leadershipChecker leadership.Checker) *StatusAPI {
// TODO(fwereade): so *all* of these have exactly the same auth
// characteristics? I think not.
unitSetter := common.NewStatusSetter(st, getCanModify)
unitGetter := common.NewStatusGetter(st, getCanModify)
applicationSetter := common.NewApplicationStatusSetter(st, getCanModify, leadershipChecker)
agentSetter := common.NewStatusSetter(&common.UnitAgentFinder{st}, getCanModify)
return &StatusAPI{
st: st,
model: model,
leadershipChecker: leadershipChecker,
agentSetter: agentSetter,
unitSetter: unitSetter,
unitGetter: unitGetter,
applicationSetter: applicationSetter,
getCanModify: getCanModify,
}
}
// SetStatus will set status for a entities passed in args. If the entity is
// a Unit it will instead set status to its agent, to emulate backwards
// compatibility.
func (s *StatusAPI) SetStatus(args params.SetStatus) (params.ErrorResults, error) {
return s.SetAgentStatus(args)
}
// SetAgentStatus will set status for agents of Units passed in args, if one
// of the args is not an Unit it will fail.
func (s *StatusAPI) SetAgentStatus(args params.SetStatus) (params.ErrorResults, error) {
return s.agentSetter.SetStatus(args)
}
// SetUnitStatus sets status for all elements passed in args, the difference
// with SetStatus is that if an entity is a Unit it will set its status instead
// of its agent.
func (s *StatusAPI) SetUnitStatus(args params.SetStatus) (params.ErrorResults, error) {
return s.unitSetter.SetStatus(args)
}
// SetApplicationStatus sets the status for all the Applications in args if the given Unit is
// the leader.
func (s *StatusAPI) SetApplicationStatus(args params.SetStatus) (params.ErrorResults, error) {
return s.applicationSetter.SetStatus(args)
}
// UnitStatus returns the workload status information for the unit.
func (s *StatusAPI) UnitStatus(args params.Entities) (params.StatusResults, error) {
return s.unitGetter.Status(args)
}
// ApplicationStatus returns the status of the Applications and its workloads
// if the given unit is the leader.
func (s *StatusAPI) ApplicationStatus(args params.Entities) (params.ApplicationStatusResults, error) {
result := params.ApplicationStatusResults{
Results: make([]params.ApplicationStatusResult, len(args.Entities)),
}
canAccess, err := s.getCanModify()
if err != nil {
return params.ApplicationStatusResults{}, err
}
for i, arg := range args.Entities {
// TODO(fwereade): the auth is basically nonsense, and basically only
// works by coincidence (and is happening at the wrong layer anyway).
// Read carefully.
// We "know" that arg.Tag is either the calling unit or its application
// (because getCanAccess is authUnitOrApplication, 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 application tags to refer
// to applications in this method).
tag, err := names.ParseTag(arg.Tag)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
if !canAccess(tag) {
result.Results[i].Error = apiservererrors.ServerError(apiservererrors.ErrPerm)
continue
}
unitTag, ok := tag.(names.UnitTag)
if !ok {
// No matter what the canAccess 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 application that should have been
// specified in the first place...
applicationId, err := names.UnitApplication(unitId)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
application, err := s.st.Application(applicationId)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(err)
continue
}
// ...so we can check the unit's application leadership...
token := s.leadershipChecker.LeadershipCheck(applicationId, unitId)
if err := token.Check(0, nil); err != nil {
// TODO(fwereade) this should probably be ErrPerm is 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
}
result.Results[i] = s.getAppAndUnitStatus(application)
}
return result, nil
}
func (s *StatusAPI) toStatusResult(i status.StatusInfo) params.StatusResult {
return params.StatusResult{
Status: i.Status.String(),
Info: i.Message,
Data: i.Data,
Since: i.Since,
}
}
func (s *StatusAPI) getAppAndUnitStatus(application *state.Application) params.ApplicationStatusResult {
// If for some reason the application isn't yet in the cache, then
// it has an unknown status.
result := params.ApplicationStatusResult{
Units: make(map[string]params.StatusResult),
}
appStatus := status.StatusInfo{
Status: status.Unknown,
}
app, err := s.model.Application(application.Name())
if err == nil {
appStatus = app.Status()
}
result.Application = s.toStatusResult(appStatus)
unitStatuses, err := application.UnitStatuses()
if err != nil {
result.Error = apiservererrors.ServerError(err)
} else {
for name, status := range unitStatuses {
result.Units[name] = s.toStatusResult(status)
}
}
return result
}
type cacheShim struct {
model *cache.Model
}
func (c cacheShim) Application(name string) (CachedApplication, error) {
app, err := c.model.Application(name)
if err != nil {
return nil, err
}
return &app, nil
}