add http resolver

network/resolver/http/http.go

@@ -0,0 +1,59 @@
+// Package http resolves ids to network addresses using a http request
+package http
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+
+	"github.com/micro/go-micro/network/resolver"
+)
+
+type Resolver struct {
+	// If not set, defaults to http
+	Proto string
+
+	// Path sets the path to lookup. Defaults to /network
+	Path string
+}
+
+// Resolve assumes ID is a domain which can be converted to a http://id/network request
+func (r *Resolver) Resolve(id string) ([]*resolver.Record, error) {
+	proto := "http"
+	path := "/network"
+
+	if len(r.Proto) > 0 {
+		proto = r.Proto
+	}
+
+	if len(r.Path) > 0 {
+		path = r.Path
+	}
+
+	uri := &url.URL{
+		Scheme: proto,
+		Path:   path,
+		Host:   id,
+	}
+
+	rsp, err := http.Get(uri.String())
+	if err != nil {
+		return nil, err
+	}
+	defer rsp.Body.Close()
+
+	b, err := ioutil.ReadAll(rsp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// encoding format is assumed to be json
+	var records []*resolver.Record
+
+	if err := json.Unmarshal(b, &records); err != nil {
+		return nil, err
+	}
+
+	return records, nil
+}

network/resolver/resolver.go

@@ -8,5 +8,5 @@ type Resolver interface {
 
 // A resoved id
 type Record struct {
-	Address string
+	Address string `json:"address"`
 }