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upgrade.go
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upgrade.go
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// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
// or more contributor license agreements. Licensed under the Elastic License;
// you may not use this file except in compliance with the Elastic License.
package capabilities
import (
"fmt"
"strings"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/state"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/agent/transpiler"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/logger"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/status"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/eql"
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/fleetapi"
)
const (
versionKey = "version"
sourceURIKey = "source_uri"
)
// NewUpgradeCapability creates capability filter for upgrade.
// Available variables:
// - version
// - source_uri
func newUpgradesCapability(log *logger.Logger, rd *ruleDefinitions, reporter status.Reporter) (Capability, error) {
if rd == nil {
return &multiUpgradeCapability{caps: []*upgradeCapability{}}, nil
}
caps := make([]*upgradeCapability, 0, len(rd.Capabilities))
for _, r := range rd.Capabilities {
c, err := newUpgradeCapability(log, r, reporter)
if err != nil {
return nil, err
}
if c != nil {
caps = append(caps, c)
}
}
return &multiUpgradeCapability{log: log, caps: caps}, nil
}
func newUpgradeCapability(log *logger.Logger, r ruler, reporter status.Reporter) (*upgradeCapability, error) {
cap, ok := r.(*upgradeCapability)
if !ok {
return nil, nil
}
cap.Type = strings.ToLower(cap.Type)
if cap.Type != allowKey && cap.Type != denyKey {
return nil, fmt.Errorf("'%s' is not a valid type 'allow' and 'deny' are supported", cap.Type)
}
// if eql definition is not supported make a global rule
if len(cap.UpgradeEqlDefinition) == 0 {
cap.UpgradeEqlDefinition = "true"
}
eqlExp, err := eql.New(cap.UpgradeEqlDefinition)
if err != nil {
return nil, err
}
cap.upgradeEql = eqlExp
cap.log = log
cap.reporter = reporter
return cap, nil
}
type upgradeCapability struct {
log *logger.Logger
reporter status.Reporter
Name string `json:"name,omitempty" yaml:"name,omitempty"`
Type string `json:"rule" yaml:"rule"`
// UpgradeEql is eql expression defining upgrade
UpgradeEqlDefinition string `json:"upgrade" yaml:"upgrade"`
upgradeEql *eql.Expression
}
func (c *upgradeCapability) Rule() string {
return c.Type
}
func (c *upgradeCapability) name() string {
if c.Name != "" {
return c.Name
}
t := "A"
if c.Type == denyKey {
t = "D"
}
// e.g UA(*) or UD(7.*.*)
c.Name = fmt.Sprintf("U%s(%s)", t, c.UpgradeEqlDefinition)
return c.Name
}
// Apply supports upgrade action or fleetapi upgrade action object.
func (c *upgradeCapability) Apply(upgradeMap map[string]interface{}) (map[string]interface{}, error) {
// if eql is not parsed or defined skip
if c.upgradeEql == nil {
return upgradeMap, nil
}
// create VarStore out of map
varStore, err := transpiler.NewAST(upgradeMap)
if err != nil {
c.log.Errorf("failed creating a varStore for capability '%s': %v", c.name(), err)
return upgradeMap, nil
}
isSupported, err := c.upgradeEql.Eval(varStore)
if err != nil {
c.log.Errorf("failed evaluating eql formula for capability '%s': %v", c.name(), err)
return upgradeMap, nil
}
// if deny switch the logic
if c.Type == denyKey {
isSupported = !isSupported
msg := fmt.Sprintf("upgrade is blocked out due to capability restriction '%s'", c.name())
c.log.Errorf(msg)
c.reporter.Update(state.Degraded, msg, nil)
}
if !isSupported {
return upgradeMap, ErrBlocked
}
return upgradeMap, nil
}
type multiUpgradeCapability struct {
log *logger.Logger
caps []*upgradeCapability
}
func (c *multiUpgradeCapability) Apply(in interface{}) (interface{}, error) {
upgradeMap := upgradeObject(in)
if upgradeMap == nil {
// not an upgrade we don't alter origin
return in, nil
}
for _, cap := range c.caps {
// upgrade does not modify incoming action
_, err := cap.Apply(upgradeMap)
if err != nil {
return in, err
}
}
return in, nil
}
func upgradeObject(a interface{}) map[string]interface{} {
resultMap := make(map[string]interface{})
if ua, ok := a.(upgradeAction); ok {
resultMap[versionKey] = ua.Version()
resultMap[sourceURIKey] = ua.SourceURI()
return resultMap
}
if ua, ok := a.(*fleetapi.ActionUpgrade); ok {
resultMap[versionKey] = ua.Version
resultMap[sourceURIKey] = ua.SourceURI
return resultMap
}
if ua, ok := a.(fleetapi.ActionUpgrade); ok {
resultMap[versionKey] = ua.Version
resultMap[sourceURIKey] = ua.SourceURI
return resultMap
}
return nil
}
type upgradeAction interface {
// Version to upgrade to.
Version() string
// SourceURI for download.
SourceURI() string
}