Added ParseResponse and ParseResponseBytes methods

    * added test coverage as well

Author: Dhaivat Pandit

fixtures_test.go

@@ -3,6 +3,7 @@ package openrtb
 var testFixtures = struct {
 	simpleBanner       []byte
 	expandableCreative []byte
+	simpleResponse     []byte
 }{
 	simpleBanner: []byte(`
 {
@@ -134,4 +135,29 @@ var testFixtures = struct {
     ]
   }
 }`),
+	simpleResponse: []byte(`
+{
+    "id": "BID-4-ZIMP-4b309eae-504a-4252-a8a8-4c8ceee9791a",
+    "seatbid": [
+        {
+            "bid": [
+                {
+                    "id": "32a69c6ba388f110487f9d1e63f77b22d86e916b",
+                    "impid": "32a69c6ba388f110487f9d1e63f77b22d86e916b",
+                    "price": 0.065445,
+                    "adid": "529833ce55314b19e8796116",
+                    "nurl": "http://ads.com/win/529833ce55314b19e8796116?won=${auction_price}",
+                    "adm": "<iframe src=\"foo.bar\"/>" ,
+                    "adomain": [],
+                    "cid": "529833ce55314b19e8796116",
+                    "crid": "529833ce55314b19e8796116_1385706446",
+                    "attr": []
+                }
+            ],
+            "seat": "772"
+        }
+    ],
+    "cur": "USD"
+}
+`),
 }

response.go

@@ -1,6 +1,10 @@
 package openrtb
 
-import "errors"
+import (
+	"encoding/json"
+	"errors"
+	"io"
+)
 
 // ID and at least one “seatbid” object is required, which contains a bid on at least one impression.
 // Other attributes are optional since an exchange may establish default values.
@@ -21,6 +25,23 @@ var (
 	ErrInvalidResSeatbid = errors.New("openrtb response: missing seatbids")
 )
 
+//Parses an OpenRTB Response from an io.Reader
+func ParseResponse(reader io.Reader) (resp *Response, err error) {
+	dec := json.NewDecoder(reader)
+	if err = dec.Decode(&resp); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
+//Parses an OpenRTB Response from bytes
+func ParseResponseBytes(data []byte) (resp *Response, err error) {
+	if err = json.Unmarshal(data, &resp); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
 // Validate Response required attributes
 // @return [Boolean,Error] true if response,seatbid,bid required attrs present
 func (res *Response) Valid() (bool, error) {

response_test.go

@@ -1,12 +1,15 @@
 package openrtb
 
 import (
+	"bytes"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("Response", func() {
 	var subject *Response
+	var sptr = func(s string) *string { return &s }
+	var fptr = func(f float32) *float32 { return &f }
 
 	BeforeEach(func() {
 		subject = new(Response)
@@ -28,4 +31,24 @@ var _ = Describe("Response", func() {
 		Expect(err).NotTo(HaveOccurred())
 		Expect(ok).To(BeTrue())
 	})
+
+	It("should parse responses", func() {
+		resp, err := ParseResponse(bytes.NewBuffer(testFixtures.simpleResponse))
+		Expect(err).NotTo(HaveOccurred())
+
+		bid := Bid{
+			Id:      sptr("32a69c6ba388f110487f9d1e63f77b22d86e916b"),
+			Impid:   sptr("32a69c6ba388f110487f9d1e63f77b22d86e916b"),
+			Price:   fptr(0.065445),
+			Adid:    sptr("529833ce55314b19e8796116"),
+			Nurl:    sptr("http://ads.com/win/529833ce55314b19e8796116?won=${auction_price}"),
+			Adm:     sptr("<iframe src=\"foo.bar\"/>"),
+			Adomain: []string{},
+			Attr:    []int{},
+			Cid:     sptr("529833ce55314b19e8796116"),
+			Crid:    sptr("529833ce55314b19e8796116_1385706446"),
+		}
+
+		Expect(resp.Seatbid[0].Bid[0]).To(Equal(bid))
+	})
 })