package consul // import "go.unistack.org/micro-config-consul/v3" import ( "context" "fmt" "github.com/hashicorp/consul/api" "github.com/imdario/mergo" "go.unistack.org/micro/v3/config" rutil "go.unistack.org/micro/v3/util/reflect" ) var DefaultStructTag = "consul" type consulConfig struct { opts config.Options cli *api.Client path string } func (c *consulConfig) Options() config.Options { return c.opts } func (c *consulConfig) Init(opts ...config.Option) error { for _, o := range opts { o(&c.opts) } if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail { return err } if c.opts.Codec == nil && !c.opts.AllowFail { return config.ErrCodecMissing } cfg := api.DefaultConfigWithLogger(&consulLogger{logger: c.opts.Logger}) path := "" if c.opts.Context != nil { if v, ok := c.opts.Context.Value(configKey{}).(*api.Config); ok { cfg.Address = v.Address cfg.Scheme = v.Scheme cfg.Datacenter = v.Datacenter cfg.Transport = v.Transport cfg.HttpClient = v.HttpClient cfg.HttpAuth = v.HttpAuth cfg.WaitTime = v.WaitTime cfg.Token = v.Token cfg.TokenFile = v.TokenFile cfg.Namespace = v.Namespace cfg.TLSConfig = v.TLSConfig } if v, ok := c.opts.Context.Value(addrKey{}).(string); ok { cfg.Address = v } if v, ok := c.opts.Context.Value(tokenKey{}).(string); ok { cfg.Token = v } if v, ok := c.opts.Context.Value(pathKey{}).(string); ok { path = v } /* if v, ok := c.opts.Context.Value(tlsConfigKey{}).(*tls.Config); ok { cfg.TLSConfig = *v } */ } cli, err := api.NewClient(cfg) if err != nil && !c.opts.AllowFail { return err } c.cli = cli c.path = path if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail { return err } return nil } func (c *consulConfig) Load(ctx context.Context, opts ...config.LoadOption) error { options := config.NewLoadOptions(opts...) if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail { return err } path := c.path if options.Context != nil { if v, ok := options.Context.Value(pathKey{}).(string); ok && v != "" { path = v } } pair, _, err := c.cli.KV().Get(path, nil) if err != nil { err = fmt.Errorf("consul path %s load error: %w", path, err) } else if pair == nil { err = fmt.Errorf("consul path %s load error: not found", path) } if err != nil && !c.opts.AllowFail { return err } if err = config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail { return err } mopts := []func(*mergo.Config){mergo.WithTypeCheck} if options.Override { mopts = append(mopts, mergo.WithOverride) } if options.Append { mopts = append(mopts, mergo.WithAppendSlice) } dst := c.opts.Struct if options.Struct != nil { dst = options.Struct } src, err := rutil.Zero(dst) if err == nil { err = c.opts.Codec.Unmarshal(pair.Value, src) if err == nil { err = mergo.Merge(dst, src, mopts...) } } if err != nil && !c.opts.AllowFail { return err } if err := config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail { return err } return nil } func (c *consulConfig) Save(ctx context.Context, opts ...config.SaveOption) error { options := config.NewSaveOptions(opts...) if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail { return err } path := c.path dst := c.opts.Struct if options.Struct != nil { dst = options.Struct } if options.Context != nil { if v, ok := options.Context.Value(pathKey{}).(string); ok && v != "" { path = v } } buf, err := c.opts.Codec.Marshal(dst) if err == nil { _, err = c.cli.KV().Put(&api.KVPair{Key: path, Value: buf}, nil) } if err != nil && !c.opts.AllowFail { return fmt.Errorf("consul path %s save error: %v", path, err) } if err := config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail { return err } return nil } func (c *consulConfig) String() string { return "consul" } func (c *consulConfig) Name() string { return c.opts.Name } func (c *consulConfig) Watch(ctx context.Context, opts ...config.WatchOption) (config.Watcher, error) { path := c.path options := config.NewWatchOptions(opts...) if options.Context != nil { if v, ok := options.Context.Value(pathKey{}).(string); ok && v != "" { path = v } } w := &consulWatcher{ cli: c.cli, path: path, opts: c.opts, wopts: config.NewWatchOptions(opts...), done: make(chan struct{}), vchan: make(chan map[string]interface{}), echan: make(chan error), } go w.run() return w, nil } func NewConfig(opts ...config.Option) config.Config { options := config.NewOptions(opts...) if len(options.StructTag) == 0 { options.StructTag = DefaultStructTag } return &consulConfig{opts: options} }