Added /info endpoint. Fixes #1232

api.go

@@ -1121,6 +1121,17 @@ func (api *API) Version() string {
 	return strings.TrimPrefix(Version, "v")
 }
 
+// Info returns information about this server instance
+func (api *API) Info() ServerInfo {
+	return ServerInfo{
+		SliceWidth: SliceWidth,
+	}
+}
+
+type ServerInfo struct {
+	SliceWidth uint64 `json:"sliceWidth"`
+}
+
 type apiMethod int
 
 // API validation constants.

handler.go

@@ -126,6 +126,7 @@ func NewRouter(handler *Handler) *mux.Router {
 	router.HandleFunc("/schema", handler.handleGetSchema).Methods("GET")
 	router.HandleFunc("/slices/max", handler.handleGetSlicesMax).Methods("GET") // TODO: deprecate, but it's being used by the client (for backups)
 	router.HandleFunc("/status", handler.handleGetStatus).Methods("GET")
+	router.HandleFunc("/info", handler.handleGetInfo).Methods("GET")
 	router.HandleFunc("/version", handler.handleGetVersion).Methods("GET")
 
 	router.HandleFunc("/cluster/resize/abort", handler.handlePostClusterResizeAbort).Methods("POST")
@@ -252,6 +253,13 @@ func (h *Handler) handleGetStatus(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (h *Handler) handleGetInfo(w http.ResponseWriter, r *http.Request) {
+	info := h.API.Info()
+	if err := json.NewEncoder(w).Encode(info); err != nil {
+		h.Logger.Printf("write info response error: %s", err)
+	}
+}
+
 type getSchemaResponse struct {
 	Indexes []*IndexInfo `json:"indexes"`
 }

handler_test.go

@@ -19,6 +19,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -154,6 +155,20 @@ func TestHandler_Status(t *testing.T) {
 	}
 }
 
+func TestHandler_Info(t *testing.T) {
+	s := test.NewServer()
+	defer s.Close()
+	h := test.NewHandler()
+
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, test.MustNewHTTPRequest("GET", "/info", nil))
+	if w.Code != http.StatusOK {
+		t.Fatalf("unexpected status code: %d", w.Code)
+	} else if body := w.Body.String(); body != fmt.Sprintf("{\"sliceWidth\":%d}\n", SliceWidth) {
+		t.Fatalf("unexpected body: %s", body)
+	}
+}
+
 // Ensure the handler can abort a cluster resize.
 func TestHandler_ClusterResizeAbort(t *testing.T) {