initial import

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

consul.go

@@ -0,0 +1,91 @@
+package consul
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	api "github.com/hashicorp/consul/api"
+	"github.com/unistack-org/micro/v3/config"
+)
+
+var (
+	DefaultStructTag = "consul"
+	ErrInvalidStruct = errors.New("invalid struct specified")
+	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)
+	}
+
+	cfg := api.DefaultConfig()
+	path := ""
+
+	if c.opts.Context != nil {
+		if v, ok := c.opts.Context.Value(configKey{}).(*api.Config); ok {
+			cfg = v
+		}
+
+		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
+		}
+
+	}
+
+	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 {
+	pair, _, err := c.cli.KV().Get(c.path, nil)
+	if err != nil {
+		return err
+	} else if pair == nil {
+		return ErrPathNotExist
+	}
+
+	return json.Unmarshal(pair.Value, c.opts.Struct)
+}
+
+func (c *consulConfig) Save(ctx context.Context) error {
+	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}
+}