gateway: degrade error in gateway to log to reduce noise

It logs all errors including expired IPNS keys and other non important
errors.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

core/corehttp/gateway_handler.go

@@ -12,12 +12,12 @@ import (
 	"time"
 
 	core "github.com/ipfs/go-ipfs/core"
+	coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
 	"github.com/ipfs/go-ipfs/importer"
 	chunk "github.com/ipfs/go-ipfs/importer/chunk"
 	dag "github.com/ipfs/go-ipfs/merkledag"
 	dagutils "github.com/ipfs/go-ipfs/merkledag/utils"
-
-	coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
+	"github.com/ipfs/go-ipfs/namesys"
 	path "github.com/ipfs/go-ipfs/path"
 	ft "github.com/ipfs/go-ipfs/unixfs"
 
@@ -166,6 +166,11 @@ func (i *gatewayHandler) getOrHeadHandler(ctx context.Context, w http.ResponseWr
 		w.WriteHeader(http.StatusServiceUnavailable)
 		fmt.Fprint(w, "Could not resolve path. Node is in offline mode.")
 		return
+	} else if err == namesys.ErrResolveFailed {
+		// Don't log that error as it is just noise
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "Path Resolve error: %s", err.Error())
+		return
 	} else if err != nil {
 		webError(w, "Path Resolve error", err, http.StatusBadRequest)
 		return
@@ -531,7 +536,8 @@ func webError(w http.ResponseWriter, message string, err error, defaultCode int)
 
 func webErrorWithCode(w http.ResponseWriter, message string, err error, code int) {
 	w.WriteHeader(code)
-	log.Errorf("%s: %s", message, err) // TODO(cryptix): log errors until we have a better way to expose these (counter metrics maybe)
+
+	log.Errorf("%s: %s", message, err) // TODO(cryptix): log until we have a better way to expose these (counter metrics maybe)
 	fmt.Fprintf(w, "%s: %s", message, err)
 }