[FAB-4469] Add REST endpoint for sanity check

The sanity checking code added in FAB-4468 currently has no external
interface.  In order to satisfy the requirements of FAB-3831, it is
necessary to expose an external interface to this sanity checking
ability.

This CR adds a REST endpoint at /configtxlator/sanitycheck/config which
the user may POST a marshaled common.Config to.  The REST target then
replies with a JSON document, indicating the error types and paths, as
reported by the sanity checking code.

Change-Id: I97616eec67aebd77ea8191b8ae39808716330aec
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

common/tools/configtxlator/rest/configtxlator_handlers.go

@@ -17,12 +17,13 @@ limitations under the License.
 package rest
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 
+	"github.com/hyperledger/fabric/common/tools/configtxlator/sanitycheck"
 	"github.com/hyperledger/fabric/common/tools/configtxlator/update"
-
 	cb "github.com/hyperledger/fabric/protos/common"
 
 	"github.com/golang/protobuf/proto"
@@ -88,3 +89,37 @@ func ComputeUpdateFromConfigs(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/octet-stream")
 	w.Write(encoded)
 }
+
+func SanityCheckConfig(w http.ResponseWriter, r *http.Request) {
+	buf, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintln(w, err)
+		return
+	}
+
+	config := &cb.Config{}
+	err = proto.Unmarshal(buf, config)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "Error unmarshaling data to common.Config': %s\n", err)
+		return
+	}
+
+	fmt.Printf("Sanity checking %+v\n", config)
+	sanityCheckMessages, err := sanitycheck.Check(config)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprintf(w, "Error performing sanity check: %s\n", err)
+		return
+	}
+
+	resBytes, err := json.Marshal(sanityCheckMessages)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprintf(w, "Error marshaling result to JSON: %s\n", err)
+		return
+	}
+	w.WriteHeader(http.StatusOK)
+	w.Write(resBytes)
+}

common/tools/configtxlator/rest/configtxlator_handlers_test.go

@@ -18,11 +18,13 @@ package rest
 
 import (
 	"bytes"
+	"encoding/json"
 	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
+	"github.com/hyperledger/fabric/common/tools/configtxlator/sanitycheck"
 	cb "github.com/hyperledger/fabric/protos/common"
 	"github.com/hyperledger/fabric/protos/utils"
 
@@ -157,3 +159,26 @@ func TestProtolatorCorruptProtos(t *testing.T) {
 
 	assert.Equal(t, http.StatusBadRequest, rec.Code)
 }
+
+func TestConfigtxlatorSanityCheckConfig(t *testing.T) {
+	req, _ := http.NewRequest("POST", "/configtxlator/config/verify", bytes.NewReader(utils.MarshalOrPanic(&cb.Config{})))
+	rec := httptest.NewRecorder()
+	r := NewRouter()
+	r.ServeHTTP(rec, req)
+
+	assert.Equal(t, http.StatusOK, rec.Code)
+
+	outputMsg := &sanitycheck.Messages{}
+
+	err := json.Unmarshal(rec.Body.Bytes(), outputMsg)
+	assert.NoError(t, err)
+}
+
+func TestConfigtxlatorSanityCheckMalformedConfig(t *testing.T) {
+	req, _ := http.NewRequest("POST", "/configtxlator/config/verify", bytes.NewReader([]byte("Garbage")))
+	rec := httptest.NewRecorder()
+	r := NewRouter()
+	r.ServeHTTP(rec, req)
+
+	assert.Equal(t, http.StatusBadRequest, rec.Code)
+}

common/tools/configtxlator/rest/router.go

@@ -35,6 +35,9 @@ func NewRouter() *mux.Router {
 	router.
 		HandleFunc("/configtxlator/compute/update-from-configs", ComputeUpdateFromConfigs).
 		Methods("POST")
+	router.
+		HandleFunc("/configtxlator/config/verify", SanityCheckConfig).
+		Methods("POST")
 
 	return router
 }