| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package pipeline |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "log/slog" |
| 10 | "time" |
| 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 | |
| 17 | type DiscovererFactory func(payload DiscovererPayload, source string) ([]model.Discoverer, error) |
| 18 | |
| 19 | func New(cfg Config, makeDiscoverers DiscovererFactory) (*Pipeline, error) { |
| 20 | if err := ValidateConfig(cfg); err != nil { |
| 21 | return nil, err |
| 22 | } |
| 23 | if makeDiscoverers == nil { |
| 24 | return nil, errors.New("discoverer factory is not set") |
| 25 | } |
| 26 | |
| 27 | p := &Pipeline{ |
| 28 | Logger: logger.New().With( |
| 29 | slog.String("component", "service discovery"), |
| 30 | slog.String("pipeline", cfg.Name), |
| 31 | ), |
| 32 | configDefaults: cfg.ConfigDefaults, |
| 33 | accum: newAccumulator(), |
| 34 | discoverers: make([]model.Discoverer, 0), |
| 35 | configs: make(map[string]map[uint64][]confgroup.Config), |
| 36 | } |
| 37 | |
| 38 | p.accum.Logger = p.Logger |
| 39 | |
| 40 | svr, err := newServiceEngine(cfg.Services) |
| 41 | if err != nil { |
| 42 | return nil, fmt.Errorf("services rules: %v", err) |
| 43 | } |
| 44 | p.svr = svr |
| 45 | svr.Logger = p.Logger |
| 46 | |
| 47 | if err := p.registerDiscoverers(cfg, makeDiscoverers); err != nil { |
| 48 | return nil, err |
| 49 | } |
| 50 | |
| 51 | return p, nil |
| 52 | } |
| 53 | |
| 54 | type ( |
| 55 | Pipeline struct { |
| 56 | *logger.Logger |
| 57 | |
| 58 | configDefaults confgroup.Registry |
| 59 | discoverers []model.Discoverer |
| 60 | accum *accumulator |
| 61 | |
| 62 | configs map[string]map[uint64][]confgroup.Config // [targetSource][targetHash] |
| 63 | |
| 64 | // new |
| 65 | svr composer |
| 66 | } |
| 67 | composer interface { |
| 68 | compose(model.Target) []confgroup.Config |
| 69 | } |
| 70 | ) |
| 71 | |
| 72 | func (p *Pipeline) registerDiscoverers(conf Config, makeDiscoverers DiscovererFactory) error { |
| 73 | discs, err := makeDiscoverers(conf.Discoverer, conf.Source) |
| 74 | if err != nil { |
| 75 | return fmt.Errorf("failed to create %q discoverer: %w", conf.Discoverer.Type(), err) |
| 76 | } |
| 77 | p.discoverers = append(p.discoverers, discs...) |
| 78 | |
| 79 | if len(p.discoverers) == 0 { |
| 80 | return errors.New("no discoverers registered") |
| 81 | } |
| 82 | |
| 83 | return nil |
| 84 | } |
| 85 | |
| 86 | func (p *Pipeline) Run(ctx context.Context, in chan<- []*confgroup.Group) { |
| 87 | p.Info("instance is started") |
| 88 | defer p.Info("instance is stopped") |
| 89 | |
| 90 | p.accum.discoverers = p.discoverers |
| 91 | |
| 92 | updates := make(chan []model.TargetGroup) |
| 93 | done := make(chan struct{}) |
| 94 | |
| 95 | go func() { defer close(done); p.accum.run(ctx, updates) }() |
| 96 | |
| 97 | for { |
| 98 | select { |
| 99 | case <-ctx.Done(): |
| 100 | select { |
| 101 | case <-done: |
| 102 | case <-time.After(time.Second * 10): |
| 103 | } |
| 104 | return |
| 105 | case <-done: |
| 106 | return |
| 107 | case tggs := <-updates: |
| 108 | p.Debugf("received %d target groups", len(tggs)) |
| 109 | if cfggs := p.processGroups(tggs); len(cfggs) > 0 { |
| 110 | select { |
| 111 | case <-ctx.Done(): |
| 112 | case in <- cfggs: // FIXME: potentially stale configs if upstream cannot receive (blocking) |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | func (p *Pipeline) processGroups(tggs []model.TargetGroup) []*confgroup.Group { |
| 120 | var groups []*confgroup.Group |
| 121 | // updates come from the accumulator; this ensures that all groups have different sources |
| 122 | for _, tgg := range tggs { |
| 123 | p.Debugf("processing group '%s' with %d target(s)", tgg.Source(), len(tgg.Targets())) |
| 124 | if v := p.processGroup(tgg); v != nil { |
| 125 | groups = append(groups, v) |
| 126 | } |
| 127 | } |
| 128 | return groups |
| 129 | } |
| 130 | |
| 131 | func (p *Pipeline) processGroup(tgg model.TargetGroup) *confgroup.Group { |
| 132 | if len(tgg.Targets()) == 0 { |
| 133 | if _, ok := p.configs[tgg.Source()]; !ok { |
| 134 | return nil |
| 135 | } |
| 136 | delete(p.configs, tgg.Source()) |
| 137 | |
| 138 | return &confgroup.Group{Source: tgg.Source()} |
| 139 | } |
| 140 | |
| 141 | targetsCache, ok := p.configs[tgg.Source()] |
| 142 | if !ok { |
| 143 | targetsCache = make(map[uint64][]confgroup.Config) |
| 144 | p.configs[tgg.Source()] = targetsCache |
| 145 | } |
| 146 | |
| 147 | var changed bool |
| 148 | seen := make(map[uint64]bool) |
| 149 | |
| 150 | for _, tgt := range tgg.Targets() { |
| 151 | if tgt == nil { |
| 152 | continue |
| 153 | } |
| 154 | |
| 155 | hash := tgt.Hash() |
| 156 | seen[hash] = true |
| 157 | |
| 158 | if _, ok := targetsCache[hash]; ok { |
| 159 | continue |
| 160 | } |
| 161 | |
| 162 | targetsCache[hash] = nil |
| 163 | |
| 164 | if p.svr != nil { |
| 165 | if cfgs := p.svr.compose(tgt); len(cfgs) > 0 { |
| 166 | targetsCache[hash] = cfgs |
| 167 | changed = true |
| 168 | for _, cfg := range cfgs { |
| 169 | cfg.SetProvider(tgg.Provider()) |
| 170 | cfg.SetSource(tgg.Source()) |
| 171 | cfg.SetSourceType(confgroup.TypeDiscovered) |
| 172 | if def, ok := p.configDefaults.Lookup(cfg.Module()); ok { |
| 173 | cfg.ApplyDefaults(def) |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | continue |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | for hash := range targetsCache { |
| 182 | if seen[hash] { |
| 183 | continue |
| 184 | } |
| 185 | if cfgs := targetsCache[hash]; len(cfgs) > 0 { |
| 186 | changed = true |
| 187 | } |
| 188 | delete(targetsCache, hash) |
| 189 | } |
| 190 | |
| 191 | if !changed { |
| 192 | return nil |
| 193 | } |
| 194 | |
| 195 | // TODO: deepcopy? |
| 196 | cfgGroup := &confgroup.Group{Source: tgg.Source()} |
| 197 | |
| 198 | for _, cfgs := range targetsCache { |
| 199 | cfgGroup.Configs = append(cfgGroup.Configs, cfgs...) |
| 200 | } |
| 201 | |
| 202 | return cfgGroup |
| 203 | } |