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// SPDX-License-Identifier: GPL-3.0-or-later
package pipeline
import (
"bytes"
"fmt"
"strings"
"text/template"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
)
func newTargetClassificator(cfg []ClassifyRuleConfig) (*targetClassificator, error) {
rules, err := newClassifyRules(cfg)
if err != nil {
return nil, err
}
c := &targetClassificator{
rules: rules,
buf: bytes.Buffer{},
}
return c, nil
}
type (
targetClassificator struct {
*logger.Logger
rules []*classifyRule
buf bytes.Buffer
}
classifyRule struct {
name string
sr selector
tags model.Tags
match []*classifyRuleMatch
}
classifyRuleMatch struct {
tags model.Tags
expr *template.Template
}
)
func (c *targetClassificator) classify(tgt model.Target) model.Tags {
var tags model.Tags
for i, rule := range c.rules {
if !rule.sr.matches(tgt.Tags()) {
continue
}
for j, match := range rule.match {
c.buf.Reset()
if err := match.expr.Execute(&c.buf, tgt); err != nil {
c.Warningf("failed to execute classify rule[%d]->match[%d]->expr on target '%s'", i+1, j+1, tgt.TUID())
continue
}
if strings.TrimSpace(c.buf.String()) != "true" {
continue
}
if tags == nil {
tags = model.NewTags()
}
tags.Merge(rule.tags)
tags.Merge(match.tags)
}
}
return tags
}
func newClassifyRules(cfg []ClassifyRuleConfig) ([]*classifyRule, error) {
var rules []*classifyRule
fmap := newFuncMap()
for i, ruleCfg := range cfg {
i++
rule := classifyRule{name: ruleCfg.Name}
sr, err := parseSelector(ruleCfg.Selector)
if err != nil {
return nil, fmt.Errorf("rule '%d': %v", i, err)
}
rule.sr = sr
tags, err := model.ParseTags(ruleCfg.Tags)
if err != nil {
return nil, fmt.Errorf("rule '%d': %v", i, err)
}
rule.tags = tags
for j, matchCfg := range ruleCfg.Match {
j++
var match classifyRuleMatch
tags, err := model.ParseTags(matchCfg.Tags)
if err != nil {
return nil, fmt.Errorf("rule '%d/%d': %v", i, j, err)
}
match.tags = tags
tmpl, err := parseTemplate(matchCfg.Expr, fmap)
if err != nil {
return nil, fmt.Errorf("rule '%d/%d': %v", i, j, err)
}
match.expr = tmpl
rule.match = append(rule.match, &match)
}
rules = append(rules, &rule)
}
return rules, nil
}
func parseTemplate(s string, fmap template.FuncMap) (*template.Template, error) {
return template.New("root").
Option("missingkey=error").
Funcs(fmap).
Parse(s)
}
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