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[Ingest Management] Agent supports capabilities definition (elastic#2…
…3848) (elastic#24037) [Ingest Management] Agent supports capabilities definition (elastic#23848)
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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. | ||
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package capabilities | ||
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import ( | ||
"errors" | ||
"os" | ||
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"gopkg.in/yaml.v2" | ||
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"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/logger" | ||
"github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/status" | ||
) | ||
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// Capability provides a way of applying predefined filter to object. | ||
// It's up to capability to determine if capability is applicable on object. | ||
type Capability interface { | ||
// Apply applies capabilities on input and returns true if input should be completely blocked | ||
// otherwise, false and updated input is returned | ||
Apply(interface{}) (interface{}, error) | ||
} | ||
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var ( | ||
// ErrBlocked is returned when capability is blocking. | ||
ErrBlocked = errors.New("capability blocked") | ||
) | ||
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type capabilitiesManager struct { | ||
caps []Capability | ||
reporter status.Reporter | ||
} | ||
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type capabilityFactory func(*logger.Logger, *ruleDefinitions, status.Reporter) (Capability, error) | ||
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// Load loads capabilities files and prepares manager. | ||
func Load(capsFile string, log *logger.Logger, sc status.Controller) (Capability, error) { | ||
handlers := []capabilityFactory{ | ||
newInputsCapability, | ||
newOutputsCapability, | ||
newUpgradesCapability, | ||
} | ||
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cm := &capabilitiesManager{ | ||
caps: make([]Capability, 0), | ||
reporter: sc.RegisterWithPersistance("capabilities", true), | ||
} | ||
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// load capabilities from file | ||
fd, err := os.Open(capsFile) | ||
if err != nil && !os.IsNotExist(err) { | ||
return cm, err | ||
} | ||
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if os.IsNotExist(err) { | ||
log.Infof("capabilities file not found in %s", capsFile) | ||
return cm, nil | ||
} | ||
defer fd.Close() | ||
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definitions := &ruleDefinitions{Capabilities: make([]ruler, 0)} | ||
dec := yaml.NewDecoder(fd) | ||
if err := dec.Decode(&definitions); err != nil { | ||
return cm, err | ||
} | ||
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// make list of handlers out of capabilities definition | ||
for _, h := range handlers { | ||
cap, err := h(log, definitions, cm.reporter) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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if cap == nil { | ||
continue | ||
} | ||
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cm.caps = append(cm.caps, cap) | ||
} | ||
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return cm, nil | ||
} | ||
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func (mgr *capabilitiesManager) Apply(in interface{}) (interface{}, error) { | ||
var err error | ||
// reset health on start, child caps will update to fail if needed | ||
mgr.reporter.Update(status.Healthy) | ||
for _, cap := range mgr.caps { | ||
in, err = cap.Apply(in) | ||
if err != nil { | ||
return in, err | ||
} | ||
} | ||
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return in, nil | ||
} |
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