Torjus Håkestad
5cc0e7eadd
Add two complementary features to reduce remote revision cache staleness: 1. Smart local cache: When current system revision matches cached remote revision, force an immediate cache refresh to check for newer revisions. 2. NATS integration: Share cache updates across hosts via NATS pub/sub. Hosts publish revision updates when they fetch new data, and subscribe to receive updates from other hosts. Features include: - Auto-reconnect with infinite retries - Graceful fallback when NATS unavailable - Filtering by flake URL and hostname New CLI flags: --flake.nats.enable --flake.nats.url --flake.nats.subject --flake.nats.credentials-file New NixOS module options under services.prometheus.exporters.nixos.flake.nats Bumps version to 0.3.0. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
package config
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import (
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"flag"
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"fmt"
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"time"
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)
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type Config struct {
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ListenAddr string
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FlakeCollector bool
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FlakeURL string
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FlakeCheckInterval time.Duration
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// NATS configuration
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FlakeNATSEnable bool
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FlakeNATSURL string
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FlakeNATSSubject string
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FlakeNATSCredentialsFile string
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}
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func Parse() (*Config, error) {
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cfg := &Config{}
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flag.StringVar(&cfg.ListenAddr, "listen", ":9971", "Address to listen on")
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flag.BoolVar(&cfg.FlakeCollector, "collector.flake", false, "Enable flake collector")
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flag.StringVar(&cfg.FlakeURL, "flake.url", "", "Flake URL for revision comparison (required if flake collector enabled)")
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flag.DurationVar(&cfg.FlakeCheckInterval, "flake.check-interval", time.Hour, "Interval between remote flake checks")
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// NATS flags
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flag.BoolVar(&cfg.FlakeNATSEnable, "flake.nats.enable", false, "Enable NATS cache sharing")
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flag.StringVar(&cfg.FlakeNATSURL, "flake.nats.url", "nats://localhost:4222", "NATS server URL")
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flag.StringVar(&cfg.FlakeNATSSubject, "flake.nats.subject", "nixos-exporter.remote-rev", "NATS subject for revision updates")
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flag.StringVar(&cfg.FlakeNATSCredentialsFile, "flake.nats.credentials-file", "", "NATS credentials file (optional)")
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flag.Parse()
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if cfg.FlakeCollector && cfg.FlakeURL == "" {
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return nil, fmt.Errorf("--flake.url is required when --collector.flake is enabled")
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}
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if cfg.FlakeNATSEnable && !cfg.FlakeCollector {
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return nil, fmt.Errorf("--flake.nats.enable requires --collector.flake to be enabled")
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}
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return cfg, nil
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}
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