/
unit.go
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/
unit.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package description
import (
"github.com/juju/errors"
"github.com/juju/names"
"github.com/juju/schema"
)
type units struct {
Version int `yaml:"version"`
Units_ []*unit `yaml:"units"`
}
type unit struct {
Name_ string `yaml:"name"`
Machine_ string `yaml:"machine"`
AgentStatus_ *status `yaml:"agent-status"`
AgentStatusHistory_ StatusHistory_ `yaml:"agent-status-history"`
WorkloadStatus_ *status `yaml:"workload-status"`
WorkloadStatusHistory_ StatusHistory_ `yaml:"workload-status-history"`
Principal_ string `yaml:"principal,omitempty"`
Subordinates_ []string `yaml:"subordinates,omitempty"`
// TODO:
// storage constraints
// storage attachment count
PasswordHash_ string `yaml:"password-hash"`
Tools_ *agentTools `yaml:"tools"`
MeterStatusCode_ string `yaml:"meter-status-code,omitempty"`
MeterStatusInfo_ string `yaml:"meter-status-info,omitempty"`
Annotations_ `yaml:"annotations,omitempty"`
Constraints_ *constraints `yaml:"constraints,omitempty"`
}
// UnitArgs is an argument struct used to add a Unit to a Service in the Model.
type UnitArgs struct {
Tag names.UnitTag
Machine names.MachineTag
PasswordHash string
Principal names.UnitTag
Subordinates []names.UnitTag
MeterStatusCode string
MeterStatusInfo string
// TODO: storage attachment count
}
func newUnit(args UnitArgs) *unit {
var subordinates []string
for _, s := range args.Subordinates {
subordinates = append(subordinates, s.Id())
}
return &unit{
Name_: args.Tag.Id(),
Machine_: args.Machine.Id(),
PasswordHash_: args.PasswordHash,
Principal_: args.Principal.Id(),
Subordinates_: subordinates,
MeterStatusCode_: args.MeterStatusCode,
MeterStatusInfo_: args.MeterStatusInfo,
WorkloadStatusHistory_: newStatusHistory(),
AgentStatusHistory_: newStatusHistory(),
}
}
// Tag implements Unit.
func (u *unit) Tag() names.UnitTag {
return names.NewUnitTag(u.Name_)
}
// Name implements Unit.
func (u *unit) Name() string {
return u.Name_
}
// Machine implements Unit.
func (u *unit) Machine() names.MachineTag {
return names.NewMachineTag(u.Machine_)
}
// PasswordHash implements Unit.
func (u *unit) PasswordHash() string {
return u.PasswordHash_
}
// Principal implements Unit.
func (u *unit) Principal() names.UnitTag {
if u.Principal_ == "" {
return names.UnitTag{}
}
return names.NewUnitTag(u.Principal_)
}
// Subordinates implements Unit.
func (u *unit) Subordinates() []names.UnitTag {
var subordinates []names.UnitTag
for _, s := range u.Subordinates_ {
subordinates = append(subordinates, names.NewUnitTag(s))
}
return subordinates
}
// MeterStatusCode implements Unit.
func (u *unit) MeterStatusCode() string {
return u.MeterStatusCode_
}
// MeterStatusInfo implements Unit.
func (u *unit) MeterStatusInfo() string {
return u.MeterStatusInfo_
}
// Tools implements Unit.
func (u *unit) Tools() AgentTools {
// To avoid a typed nil, check before returning.
if u.Tools_ == nil {
return nil
}
return u.Tools_
}
// SetTools implements Unit.
func (u *unit) SetTools(args AgentToolsArgs) {
u.Tools_ = newAgentTools(args)
}
// WorkloadStatus implements Unit.
func (u *unit) WorkloadStatus() Status {
// To avoid typed nils check nil here.
if u.WorkloadStatus_ == nil {
return nil
}
return u.WorkloadStatus_
}
// SetWorkloadStatus implements Unit.
func (u *unit) SetWorkloadStatus(args StatusArgs) {
u.WorkloadStatus_ = newStatus(args)
}
// WorkloadStatusHistory implements Unit.
func (u *unit) WorkloadStatusHistory() []Status {
return u.WorkloadStatusHistory_.StatusHistory()
}
// SetWorkloadStatusHistory implements Unit.
func (u *unit) SetWorkloadStatusHistory(args []StatusArgs) {
u.WorkloadStatusHistory_.SetStatusHistory(args)
}
// AgentStatus implements Unit.
func (u *unit) AgentStatus() Status {
// To avoid typed nils check nil here.
if u.AgentStatus_ == nil {
return nil
}
return u.AgentStatus_
}
// SetAgentStatus implements Unit.
func (u *unit) SetAgentStatus(args StatusArgs) {
u.AgentStatus_ = newStatus(args)
}
// AgentStatusHistory implements Unit.
func (u *unit) AgentStatusHistory() []Status {
return u.AgentStatusHistory_.StatusHistory()
}
// SetAgentStatusHistory implements Unit.
func (u *unit) SetAgentStatusHistory(args []StatusArgs) {
u.AgentStatusHistory_.SetStatusHistory(args)
}
// Constraints implements HasConstraints.
func (u *unit) Constraints() Constraints {
if u.Constraints_ == nil {
return nil
}
return u.Constraints_
}
// SetConstraints implements HasConstraints.
func (u *unit) SetConstraints(args ConstraintsArgs) {
u.Constraints_ = newConstraints(args)
}
// Validate impelements Unit.
func (u *unit) Validate() error {
if u.Name_ == "" {
return errors.NotValidf("missing name")
}
if u.AgentStatus_ == nil {
return errors.NotValidf("unit %q missing agent status", u.Name_)
}
if u.WorkloadStatus_ == nil {
return errors.NotValidf("unit %q missing workload status", u.Name_)
}
if u.Tools_ == nil {
return errors.NotValidf("unit %q missing tools", u.Name_)
}
return nil
}
func importUnits(source map[string]interface{}) ([]*unit, error) {
checker := versionedChecker("units")
coerced, err := checker.Coerce(source, nil)
if err != nil {
return nil, errors.Annotatef(err, "units version schema check failed")
}
valid := coerced.(map[string]interface{})
version := int(valid["version"].(int64))
importFunc, ok := unitDeserializationFuncs[version]
if !ok {
return nil, errors.NotValidf("version %d", version)
}
sourceList := valid["units"].([]interface{})
return importUnitList(sourceList, importFunc)
}
func importUnitList(sourceList []interface{}, importFunc unitDeserializationFunc) ([]*unit, error) {
result := make([]*unit, 0, len(sourceList))
for i, value := range sourceList {
source, ok := value.(map[string]interface{})
if !ok {
return nil, errors.Errorf("unexpected value for unit %d, %T", i, value)
}
unit, err := importFunc(source)
if err != nil {
return nil, errors.Annotatef(err, "unit %d", i)
}
result = append(result, unit)
}
return result, nil
}
type unitDeserializationFunc func(map[string]interface{}) (*unit, error)
var unitDeserializationFuncs = map[int]unitDeserializationFunc{
1: importUnitV1,
}
func importUnitV1(source map[string]interface{}) (*unit, error) {
fields := schema.Fields{
"name": schema.String(),
"machine": schema.String(),
"agent-status": schema.StringMap(schema.Any()),
"agent-status-history": schema.StringMap(schema.Any()),
"workload-status": schema.StringMap(schema.Any()),
"workload-status-history": schema.StringMap(schema.Any()),
"principal": schema.String(),
"subordinates": schema.List(schema.String()),
"password-hash": schema.String(),
"tools": schema.StringMap(schema.Any()),
"meter-status-code": schema.String(),
"meter-status-info": schema.String(),
}
defaults := schema.Defaults{
"principal": "",
"subordinates": schema.Omit,
"meter-status-code": "",
"meter-status-info": "",
}
addAnnotationSchema(fields, defaults)
addConstraintsSchema(fields, defaults)
checker := schema.FieldMap(fields, defaults)
coerced, err := checker.Coerce(source, nil)
if err != nil {
return nil, errors.Annotatef(err, "unit v1 schema check failed")
}
valid := coerced.(map[string]interface{})
// From here we know that the map returned from the schema coercion
// contains fields of the right type.
result := &unit{
Name_: valid["name"].(string),
Machine_: valid["machine"].(string),
Principal_: valid["principal"].(string),
PasswordHash_: valid["password-hash"].(string),
MeterStatusCode_: valid["meter-status-code"].(string),
MeterStatusInfo_: valid["meter-status-info"].(string),
WorkloadStatusHistory_: newStatusHistory(),
AgentStatusHistory_: newStatusHistory(),
}
result.importAnnotations(valid)
workloadHistory := valid["workload-status-history"].(map[string]interface{})
if err := importStatusHistory(&result.WorkloadStatusHistory_, workloadHistory); err != nil {
return nil, errors.Trace(err)
}
agentHistory := valid["agent-status-history"].(map[string]interface{})
if err := importStatusHistory(&result.AgentStatusHistory_, agentHistory); err != nil {
return nil, errors.Trace(err)
}
if constraintsMap, ok := valid["constraints"]; ok {
constraints, err := importConstraints(constraintsMap.(map[string]interface{}))
if err != nil {
return nil, errors.Trace(err)
}
result.Constraints_ = constraints
}
result.Subordinates_ = convertToStringSlice(valid["subordinates"])
// Tools and status are required, so we expect them to be there.
tools, err := importAgentTools(valid["tools"].(map[string]interface{}))
if err != nil {
return nil, errors.Trace(err)
}
result.Tools_ = tools
agentStatus, err := importStatus(valid["agent-status"].(map[string]interface{}))
if err != nil {
return nil, errors.Trace(err)
}
result.AgentStatus_ = agentStatus
workloadStatus, err := importStatus(valid["workload-status"].(map[string]interface{}))
if err != nil {
return nil, errors.Trace(err)
}
result.WorkloadStatus_ = workloadStatus
return result, nil
}