| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package file |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "log/slog" |
| 10 | "sync" |
| 11 | |
| 12 | "github.com/netdata/netdata/go/plugins/logger" |
| 13 | "github.com/netdata/netdata/go/plugins/plugin/framework/confgroup" |
| 14 | ) |
| 15 | |
| 16 | var log = logger.New().With( |
| 17 | slog.String("component", "discovery"), |
| 18 | slog.String("discoverer", "file"), |
| 19 | ) |
| 20 | |
| 21 | func NewDiscovery(cfg Config) (*Discovery, error) { |
| 22 | if err := validateConfig(cfg); err != nil { |
| 23 | return nil, fmt.Errorf("file discovery config validation: %v", err) |
| 24 | } |
| 25 | |
| 26 | d := Discovery{ |
| 27 | Logger: log, |
| 28 | } |
| 29 | |
| 30 | if err := d.registerDiscoverers(cfg); err != nil { |
| 31 | return nil, fmt.Errorf("file discovery initialization: %v", err) |
| 32 | } |
| 33 | |
| 34 | return &d, nil |
| 35 | } |
| 36 | |
| 37 | type ( |
| 38 | Discovery struct { |
| 39 | *logger.Logger |
| 40 | discoverers []discoverer |
| 41 | } |
| 42 | discoverer interface { |
| 43 | Run(ctx context.Context, in chan<- []*confgroup.Group) |
| 44 | } |
| 45 | ) |
| 46 | |
| 47 | func (d *Discovery) String() string { |
| 48 | return d.Name() |
| 49 | } |
| 50 | |
| 51 | func (d *Discovery) Name() string { |
| 52 | return fmt.Sprintf("file discovery: %v", d.discoverers) |
| 53 | } |
| 54 | |
| 55 | func (d *Discovery) registerDiscoverers(cfg Config) error { |
| 56 | if len(cfg.Read) != 0 { |
| 57 | d.discoverers = append(d.discoverers, NewReader(cfg.Registry, cfg.Read)) |
| 58 | } |
| 59 | if len(cfg.Watch) != 0 { |
| 60 | d.discoverers = append(d.discoverers, NewWatcher(cfg.Registry, cfg.Watch)) |
| 61 | } |
| 62 | if len(d.discoverers) == 0 { |
| 63 | return errors.New("zero registered discoverers") |
| 64 | } |
| 65 | return nil |
| 66 | } |
| 67 | |
| 68 | func (d *Discovery) Run(ctx context.Context, in chan<- []*confgroup.Group) { |
| 69 | d.Info("instance is started") |
| 70 | defer func() { d.Info("instance is stopped") }() |
| 71 | |
| 72 | var wg sync.WaitGroup |
| 73 | |
| 74 | for _, dd := range d.discoverers { |
| 75 | wg.Add(1) |
| 76 | go func(dd discoverer) { |
| 77 | defer wg.Done() |
| 78 | d.runDiscoverer(ctx, dd, in) |
| 79 | }(dd) |
| 80 | } |
| 81 | |
| 82 | wg.Wait() |
| 83 | <-ctx.Done() |
| 84 | } |
| 85 | |
| 86 | func (d *Discovery) runDiscoverer(ctx context.Context, dd discoverer, in chan<- []*confgroup.Group) { |
| 87 | updates := make(chan []*confgroup.Group) |
| 88 | go dd.Run(ctx, updates) |
| 89 | for { |
| 90 | select { |
| 91 | case <-ctx.Done(): |
| 92 | return |
| 93 | case groups, ok := <-updates: |
| 94 | if !ok { |
| 95 | return |
| 96 | } |
| 97 | select { |
| 98 | case <-ctx.Done(): |
| 99 | return |
| 100 | case in <- groups: |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | } |