| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package pipeline |
| 4 | |
| 5 | import ( |
| 6 | "bytes" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "strings" |
| 10 | "text/template" |
| 11 | |
| 12 | "github.com/netdata/netdata/go/plugins/logger" |
| 13 | "github.com/netdata/netdata/go/plugins/plugin/agent/discovery/sd/model" |
| 14 | "github.com/netdata/netdata/go/plugins/plugin/framework/confgroup" |
| 15 | |
| 16 | "gopkg.in/yaml.v2" |
| 17 | ) |
| 18 | |
| 19 | func newServiceEngine(cfg []ServiceRuleConfig) (*serviceEngine, error) { |
| 20 | rules, err := newServiceRules(cfg) |
| 21 | if err != nil { |
| 22 | return nil, err |
| 23 | } |
| 24 | return &serviceEngine{rules: rules}, nil |
| 25 | } |
| 26 | |
| 27 | type serviceEngine struct { |
| 28 | *logger.Logger |
| 29 | rules []*serviceRule |
| 30 | buf bytes.Buffer |
| 31 | } |
| 32 | |
| 33 | type serviceRule struct { |
| 34 | id string |
| 35 | match *template.Template |
| 36 | tmpl *template.Template // optional |
| 37 | } |
| 38 | |
| 39 | func newServiceRules(cfg []ServiceRuleConfig) ([]*serviceRule, error) { |
| 40 | fmap := newFuncMap() |
| 41 | var rules []*serviceRule |
| 42 | |
| 43 | for i, rc := range cfg { |
| 44 | i++ |
| 45 | |
| 46 | m, err := parseTemplate(rc.Match, fmap) |
| 47 | if err != nil { |
| 48 | return nil, fmt.Errorf("service '%s'[%d]: match: %v", rc.ID, i, err) |
| 49 | } |
| 50 | |
| 51 | var tmpl *template.Template |
| 52 | if strings.TrimSpace(rc.ConfigTemplate) != "" { |
| 53 | tmpl, err = parseTemplate(rc.ConfigTemplate, fmap) |
| 54 | if err != nil { |
| 55 | return nil, fmt.Errorf("service '%s'[%d]: config_template: %v", rc.ID, i, err) |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | rules = append(rules, &serviceRule{ |
| 60 | id: rc.ID, match: m, tmpl: tmpl, |
| 61 | }) |
| 62 | } |
| 63 | return rules, nil |
| 64 | } |
| 65 | |
| 66 | func (s *serviceEngine) compose(tgt model.Target) []confgroup.Config { |
| 67 | var out []confgroup.Config |
| 68 | |
| 69 | for i, r := range s.rules { |
| 70 | s.buf.Reset() |
| 71 | |
| 72 | if err := r.match.Execute(&s.buf, tgt); err != nil { |
| 73 | s.Warningf("failed to execute services[%d]->match on target '%s'", i+1, tgt.TUID()) |
| 74 | continue |
| 75 | } |
| 76 | if strings.TrimSpace(s.buf.String()) != "true" { |
| 77 | continue |
| 78 | } |
| 79 | |
| 80 | // No config_template => drop |
| 81 | if r.tmpl == nil { |
| 82 | break |
| 83 | } |
| 84 | |
| 85 | s.buf.Reset() |
| 86 | if err := r.tmpl.Execute(&s.buf, tgt); err != nil { |
| 87 | s.Warningf("failed to execute services[%d]->config_template on target '%s': %v", i+1, tgt.TUID(), err) |
| 88 | continue |
| 89 | } |
| 90 | if s.buf.Len() == 0 { |
| 91 | continue |
| 92 | } |
| 93 | |
| 94 | cfgs, err := parseConfigTemplateData(s.buf.Bytes()) |
| 95 | if err != nil { |
| 96 | s.Warningf("failed to parse services[%d] template data: %v", i+1, err) |
| 97 | continue |
| 98 | } |
| 99 | |
| 100 | for _, cfg := range cfgs { |
| 101 | if cfg.Module() == "" { |
| 102 | cfg.SetModule(r.id) |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | out = append(out, cfgs...) |
| 107 | } |
| 108 | |
| 109 | if len(out) > 0 { |
| 110 | s.Debugf("created %d config(s) for target '%s'", len(out), tgt.TUID()) |
| 111 | } |
| 112 | |
| 113 | return out |
| 114 | } |
| 115 | |
| 116 | func parseConfigTemplateData(bs []byte) ([]confgroup.Config, error) { |
| 117 | var data any |
| 118 | if err := yaml.Unmarshal(bs, &data); err != nil { |
| 119 | return nil, err |
| 120 | } |
| 121 | |
| 122 | type ( |
| 123 | single = map[any]any |
| 124 | multi = []any |
| 125 | ) |
| 126 | |
| 127 | switch data.(type) { |
| 128 | case single: |
| 129 | var cfg confgroup.Config |
| 130 | if err := yaml.Unmarshal(bs, &cfg); err != nil { |
| 131 | return nil, err |
| 132 | } |
| 133 | return []confgroup.Config{cfg}, nil |
| 134 | case multi: |
| 135 | var cfgs []confgroup.Config |
| 136 | if err := yaml.Unmarshal(bs, &cfgs); err != nil { |
| 137 | return nil, err |
| 138 | } |
| 139 | return cfgs, nil |
| 140 | default: |
| 141 | return nil, errors.New("unknown config format") |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | func parseTemplate(s string, fmap template.FuncMap) (*template.Template, error) { |
| 146 | return template.New("root"). |
| 147 | Option("missingkey=error"). |
| 148 | Funcs(fmap). |
| 149 | Parse(s) |
| 150 | } |