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// SPDX-License-Identifier: GPL-3.0-or-later
package pipeline
import (
"bytes"
"errors"
"fmt"
"text/template"
"github.com/netdata/netdata/go/go.d.plugin/agent/confgroup"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"gopkg.in/yaml.v2"
)
func newConfigComposer(cfg []ComposeRuleConfig) (*configComposer, error) {
rules, err := newComposeRules(cfg)
if err != nil {
return nil, err
}
c := &configComposer{
rules: rules,
buf: bytes.Buffer{},
}
return c, nil
}
type (
configComposer struct {
*logger.Logger
rules []*composeRule
buf bytes.Buffer
}
composeRule struct {
name string
sr selector
conf []*composeRuleConf
}
composeRuleConf struct {
sr selector
tmpl *template.Template
}
)
func (c *configComposer) compose(tgt model.Target) []confgroup.Config {
var configs []confgroup.Config
for i, rule := range c.rules {
if !rule.sr.matches(tgt.Tags()) {
continue
}
for j, conf := range rule.conf {
if !conf.sr.matches(tgt.Tags()) {
continue
}
c.buf.Reset()
if err := conf.tmpl.Execute(&c.buf, tgt); err != nil {
c.Warningf("failed to execute rule[%d]->config[%d]->template on target '%s': %v",
i+1, j+1, tgt.TUID(), err)
continue
}
if c.buf.Len() == 0 {
continue
}
cfgs, err := c.parseTemplateData(c.buf.Bytes())
if err != nil {
c.Warningf("failed to parse template data: %v", err)
continue
}
configs = append(configs, cfgs...)
}
}
if len(configs) > 0 {
c.Debugf("created %d config(s) for target '%s'", len(configs), tgt.TUID())
}
return configs
}
func (c *configComposer) parseTemplateData(bs []byte) ([]confgroup.Config, error) {
var data any
if err := yaml.Unmarshal(bs, &data); err != nil {
return nil, err
}
type (
single = map[any]any
multi = []any
)
switch data.(type) {
case single:
var cfg confgroup.Config
if err := yaml.Unmarshal(bs, &cfg); err != nil {
return nil, err
}
return []confgroup.Config{cfg}, nil
case multi:
var cfgs []confgroup.Config
if err := yaml.Unmarshal(bs, &cfgs); err != nil {
return nil, err
}
return cfgs, nil
default:
return nil, errors.New("unknown config format")
}
}
func newComposeRules(cfg []ComposeRuleConfig) ([]*composeRule, error) {
var rules []*composeRule
fmap := newFuncMap()
for i, ruleCfg := range cfg {
i++
rule := composeRule{name: ruleCfg.Name}
sr, err := parseSelector(ruleCfg.Selector)
if err != nil {
return nil, fmt.Errorf("rule '%d': %v", i, err)
}
rule.sr = sr
for j, confCfg := range ruleCfg.Config {
j++
var conf composeRuleConf
sr, err := parseSelector(confCfg.Selector)
if err != nil {
return nil, fmt.Errorf("rule '%d/%d': %v", i, j, err)
}
conf.sr = sr
tmpl, err := parseTemplate(confCfg.Template, fmap)
if err != nil {
return nil, fmt.Errorf("rule '%d/%d': %v", i, j, err)
}
conf.tmpl = tmpl
rule.conf = append(rule.conf, &conf)
}
rules = append(rules, &rule)
}
return rules, nil
}
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