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rolebase.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2018 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package workflow
import (
"bytes"
"fmt"
"text/template"
"github.com/AliceO2Group/Control/common/logger"
"github.com/AliceO2Group/Control/core/task/channel"
"github.com/jinzhu/copier"
"github.com/sirupsen/logrus"
"github.com/AliceO2Group/Control/core/task"
"github.com/AliceO2Group/Control/core/task/constraint"
"github.com/pborman/uuid"
)
var log = logger.New(logrus.StandardLogger(), "workflow")
const(
PATH_SEPARATOR = "."
PATH_SEPARATOR_RUNE = '.'
)
type roleBase struct {
Name string `yaml:"name"`
parent Updatable
Vars task.VarMap `yaml:"vars,omitempty"`
Connect []channel.Outbound `yaml:"connect,omitempty"`
Constraints constraint.Constraints `yaml:"constraints,omitempty"`
status SafeStatus
state SafeState
}
func (r *roleBase) CollectOutboundChannels() (channels []channel.Outbound) {
if r.parent == nil {
channels = make([]channel.Outbound, 0)
} else {
channels = r.parent.CollectOutboundChannels()
}
for _, v := range r.Connect {
channels = append(channels, v)
// FIXME: this does not take into account child roles with outbound channels with the same name
// as an outbound channel in the parent.
// The correct behaviour would be OVERRIDE, currently the behavior is UNDEFINED.
}
return
}
func (r *roleBase) UnmarshalYAML(unmarshal func(interface{}) error) (err error) {
// NOTE: the local type alias is a necessary step, otherwise unmarshal(&role) would
// recurse back to this function forever
type _roleBase roleBase
role := _roleBase{
status: SafeStatus{status:task.INACTIVE},
state: SafeState{state:task.STANDBY},
}
err = unmarshal(&role)
if err == nil {
*r = roleBase(role)
}
return
}
func (r *roleBase) resolveOutboundChannelTargets() {
// TODO this func should return err
type _parentRole interface {
GetParent() Updatable
GetPath() string
}
funcMap := template.FuncMap{
"this": func() string {
return r.GetPath()
},
"parent": func() string {
p := r.GetParent()
if p == nil {
log.WithFields(logrus.Fields{"error": "role has no parent", "role": r.GetPath()}).Error("workflow configuration error")
return ""
}
return p.GetPath()
},
"up": func(levels int) string {
if levels <= 0 {
return r.GetPath()
}
var p _parentRole = r
for i := 0; i < levels; i++ {
p = p.GetParent()
if p == nil {
log.WithFields(logrus.Fields{"error": "role has no ancestor", "role": r.GetPath()}).Error("workflow configuration error")
return ""
}
}
return p.GetPath()
},
}
for i, ch := range r.Connect {
tmpl := template.New(r.GetPath())
parsed, err := tmpl.Funcs(funcMap).Parse(ch.Target)
if err != nil {
log.WithError(err).WithFields(logrus.Fields{"role": r.GetPath(), "channel": ch.Name, "target": ch.Target}).Error("cannot parse template for outbound channel target")
continue
}
buf := new(bytes.Buffer)
err = parsed.Execute(buf, struct{}{})
if err != nil {
log.WithError(err).WithFields(logrus.Fields{"role": r.GetPath(), "channel": ch.Name, "target": ch.Target}).Error("cannot execute template for outbound channel target")
continue
}
// Finally we write the result back to the target string
r.Connect[i].Target = buf.String()
}
}
func (r *roleBase) copy() copyable {
rCopy := roleBase{
Name: r.Name,
parent: r.parent,
Vars: make(task.VarMap),
Connect: make([]channel.Outbound, len(r.Connect)),
Constraints: make(constraint.Constraints, len(r.Constraints)),
status: r.status,
state: r.state,
}
err := copier.Copy(&rCopy.Vars, &r.Vars)
if err != nil {
log.WithField("role", r.GetPath()).WithError(err).Error("role copy error")
}
copied := copy(rCopy.Connect, r.Connect)
if copied != len(r.Connect) {
log.WithField("role", r.GetPath()).
WithError(fmt.Errorf("slice copy copied %d items, %d expected", copied, len(r.Connect))).
Error("role copy error")
}
copied = copy(rCopy.Constraints, r.Constraints)
if copied != len(r.Constraints) {
log.WithField("role", r.GetPath()).
WithError(fmt.Errorf("slice copy copied %d items, %d expected", copied, len(r.Constraints))).
Error("role copy error")
}
return &rCopy
}
func (r *roleBase) GetParent() Updatable {
if r == nil {
return nil
}
parentUpdatable, ok := r.parent.(Updatable)
if ok {
return parentUpdatable
}
return nil
}
func (r *roleBase) GetParentRole() Role {
if r == nil {
return nil
}
parentRole, ok := r.parent.(Role)
if ok {
return parentRole
}
return nil
}
func (r *roleBase) GetName() string {
if r == nil {
return ""
}
return r.Name
}
func (r* roleBase) GetEnvironmentId() uuid.Array {
if r.parent == nil {
return uuid.NIL.Array()
}
return r.parent.GetEnvironmentId()
}
func (r *roleBase) GetPath() string {
if r == nil {
return ""
}
if r.parent == nil {
return r.Name
}
parentPath := r.parent.GetPath()
if len(parentPath) > 0 {
return parentPath + PATH_SEPARATOR + r.Name
}
return r.Name
}
func (r *roleBase) GetStatus() task.Status {
if r == nil {
return task.UNDEFINED
}
return r.status.get()
}
func (r *roleBase) GetState() task.State {
if r == nil {
return task.UNKNOWN
}
return r.state.get()
}
func (r *roleBase) getConstraints() (cts constraint.Constraints) {
if r == nil {
return
}
if r.Constraints == nil {
cts = make(constraint.Constraints, 0)
} else {
cts = make(constraint.Constraints, len(r.Constraints))
copy(cts, r.Constraints)
}
if r.parent == nil {
return
}
if parentRole := r.GetParentRole(); parentRole != nil {
cts = cts.MergeParent(parentRole.getConstraints())
}
return
}