package consul import ( "context" "errors" "fmt" "github.com/hashicorp/consul/api" "github.com/imdario/mergo" "github.com/unistack-org/micro/v3/config" ) var ( DefaultStructTag = "consul" ErrPathNotExist = errors.New("path is not exist") ) 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 c.opts.Codec == nil { 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 { return err } c.cli = cli c.path = path return nil } func (c *consulConfig) Load(ctx context.Context) error { for _, fn := range c.opts.BeforeLoad { if err := fn(ctx, c); err != nil && !c.opts.AllowFail { return err } } pair, _, err := c.cli.KV().Get(c.path, nil) if err != nil && !c.opts.AllowFail { return fmt.Errorf("consul path load error: %v", err) } else if pair == nil && !c.opts.AllowFail { return fmt.Errorf("consul path not found %v", ErrPathNotExist) } if err == nil && pair != nil { dst, err := config.Zero(c.opts.Struct) if err == nil { err = c.opts.Codec.Unmarshal(pair.Value, c.opts.Struct) if err == nil { err = mergo.Merge(c.opts.Struct, dst, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice) } } if err != nil && !c.opts.AllowFail { return err } } for _, fn := range c.opts.AfterLoad { if err := fn(ctx, c); err != nil && !c.opts.AllowFail { return err } } return nil } func (c *consulConfig) Save(ctx context.Context) error { for _, fn := range c.opts.BeforeSave { if err := fn(ctx, c); err != nil && !c.opts.AllowFail { return err } } for _, fn := range c.opts.AfterSave { if err := fn(ctx, c); err != nil && !c.opts.AllowFail { return err } } return nil } func (c *consulConfig) String() string { return "consul" } func NewConfig(opts ...config.Option) config.Config { options := config.NewOptions(opts...) if len(options.StructTag) == 0 { options.StructTag = DefaultStructTag } return &consulConfig{opts: options} }