70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
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package config
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import (
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"context"
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"flag"
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"fmt"
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"os"
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"runtime/debug"
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"github.com/caarlos0/env/v9"
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"gopkg.in/yaml.v3"
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)
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// To be set by ldflags in go build command or
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// retrieved from build meta below
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var Version = "(devel)"
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// Calling this will try to load from config if -config is
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// provided as a file, and will apply any environment overrides
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// on-top of configuration defaults.
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// Config is stored in returned context, and can be retrieved
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// using config.FromCtx(ctx)
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func LoadConfig(ctx context.Context) (context.Context, error) {
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configPath := flag.String("config", "", "Path to the configuration file")
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flag.Parse()
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// Start with defaults
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// Load from config if provided
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// Layer on environment
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cfg, err := loadConfig(*configPath)
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if err != nil {
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return ctx, err
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}
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// Add config to context, and return
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// an updated context
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ctx = cfg.AddToCtx(ctx)
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return ctx, nil
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}
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func loadConfig(configPath string) (*AppConfig, error) {
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cfg := newAppConfig()
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if configPath != "" {
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file, err := os.Open(configPath)
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if err != nil {
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return nil, fmt.Errorf("could not open config file: %w", err)
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}
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defer file.Close()
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decoder := yaml.NewDecoder(file)
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if err := decoder.Decode(cfg); err != nil {
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return nil, fmt.Errorf("could not decode config file: %w", err)
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}
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}
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if err := env.Parse(cfg); err != nil {
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return nil, fmt.Errorf("could not parse environment variables: %w", err)
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}
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return cfg, nil
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}
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func getVersion() string {
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if info, ok := debug.ReadBuildInfo(); ok && info.Main.Version != "(devel)" {
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return info.Main.Version
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}
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return Version
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}
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