* improve grpc status to error code conversion

* improve grpc UT

src/brpc/grpc.cpp

@@ -61,13 +61,17 @@ GrpcStatus ErrorCodeToGrpcStatus(int error_code) {
     case EINVAL:
         return GRPC_INVALIDARGUMENT;
     case ELIMIT:
+        return GRPC_RESOURCEEXHAUSTED;
     case ELOGOFF:
         return GRPC_UNAVAILABLE;
     case EPERM:
         return GRPC_PERMISSIONDENIED;
     case ERPCTIMEDOUT:
+        return GRPC_DEADLINEEXCEEDED;
     case ETIMEDOUT:
         return GRPC_INTERNAL;
+    case ECANCELED:
+        return GRPC_CANCELED;
     default:
         return GRPC_INTERNAL;
     }
@@ -80,6 +84,7 @@ int GrpcStatusToErrorCode(GrpcStatus grpc_status) {
     case GRPC_CANCELED:
         return ECANCELED;
     case GRPC_UNKNOWN:
+        return EINTERNAL;
     case GRPC_INVALIDARGUMENT:
         return EINVAL;
     case GRPC_DEADLINEEXCEEDED:
@@ -99,9 +104,8 @@ int GrpcStatusToErrorCode(GrpcStatus grpc_status) {
     case GRPC_UNIMPLEMENTED:
          return ENOMETHOD;
     case GRPC_INTERNAL:
-         return EINTERNAL;
     case GRPC_UNAVAILABLE:
-         return EAGAIN;
+         return EINTERNAL;
     case GRPC_DATALOSS:
          return EINTERNAL;
     case GRPC_UNAUTHENTICATED:
@@ -109,7 +113,6 @@ int GrpcStatusToErrorCode(GrpcStatus grpc_status) {
     default:
          return EINTERNAL;
     }
-
 }
 
 void PercentEncode(const std::string& str, std::string* str_out) {

test/brpc_grpc_protocol_unittest.cpp

@@ -55,16 +55,13 @@ public:
         brpc::ClosureGuard done_guard(done);
 
         EXPECT_EQ(g_req, req->message());
-        if (req->has_gzip() && req->gzip()) {
+        if (req->gzip()) {
             cntl->set_response_compress_type(brpc::COMPRESS_TYPE_GZIP);
         }
         res->set_message(g_prefix + req->message());
 
-        if (req->has_error_code()) {
-            const std::string err_msg =
-                butil::string_printf("%s%d", g_prefix.c_str(), req->error_code());
-            // TODO(zhujiashun): set and check error_code when GrpcStatusToErrorCode is done
-            cntl->SetFailed(err_msg.c_str());
+        if (req->return_error()) {
+            cntl->SetFailed(brpc::EINTERNAL, "%s", g_prefix.c_str());
             return;
         }
     }
@@ -105,6 +102,7 @@ protected:
         }
         req.set_message(g_req);
         req.set_gzip(res_gzip);
+        req.set_return_error(false);
 
         test::GrpcService_Stub stub(&_channel);
         stub.Method(&cntl, &req, &res, NULL);
@@ -154,20 +152,17 @@ TEST_F(GrpcTest, sanity) {
 }
 
 TEST_F(GrpcTest, return_error) {
-    // GRPC_OK(0) is skipped
-    for (int i = 1; i < (int)brpc::GRPC_MAX; ++i) {
     test::GrpcRequest req;
     test::GrpcResponse res;
     brpc::Controller cntl;
     req.set_message(g_req);
-        req.set_error_code(i);
+    req.set_gzip(false);
+    req.set_return_error(true);
     test::GrpcService_Stub stub(&_channel);
     stub.Method(&cntl, &req, &res, NULL);
     EXPECT_TRUE(cntl.Failed());
-        // TODO(zhujiashun): set and check error_code when GrpcStatusToErrorCode is done
     EXPECT_EQ(cntl.ErrorCode(), brpc::EINTERNAL);
-        EXPECT_TRUE(butil::StringPiece(cntl.ErrorText()).ends_with(butil::string_printf("%s%d", g_prefix.c_str(), i)));
-    }
+    EXPECT_TRUE(butil::StringPiece(cntl.ErrorText()).ends_with(butil::string_printf("%s", g_prefix.c_str())));
 }
 
 TEST_F(GrpcTest, RpcTimedOut) {
@@ -181,6 +176,8 @@ TEST_F(GrpcTest, RpcTimedOut) {
     test::GrpcResponse res;
     brpc::Controller cntl;
     req.set_message(g_req);
+    req.set_gzip(false);
+    req.set_return_error(false);
     test::GrpcService_Stub stub(&_channel);
     stub.MethodTimeOut(&cntl, &req, &res, NULL);
     EXPECT_TRUE(cntl.Failed());
@@ -192,10 +189,11 @@ TEST_F(GrpcTest, MethodNotExist) {
     test::GrpcResponse res;
     brpc::Controller cntl;
     req.set_message(g_req);
+    req.set_gzip(false);
+    req.set_return_error(false);
     test::GrpcService_Stub stub(&_channel);
     stub.MethodNotExist(&cntl, &req, &res, NULL);
     EXPECT_TRUE(cntl.Failed());
-    // TODO(zhujiashun): set and check error_code when GrpcStatusToErrorCode is done
     EXPECT_EQ(cntl.ErrorCode(), brpc::EINTERNAL);
     ASSERT_TRUE(butil::StringPiece(cntl.ErrorText()).ends_with("Method MethodNotExist() not implemented."));
 }

test/grpc.proto

@@ -5,8 +5,8 @@ package test;
 
 message GrpcRequest {
     required string message = 1;
-    optional bool gzip = 2;
-    optional int32 error_code = 3;
+    required bool gzip = 2;
+    required bool return_error = 3;
 };
 
 message GrpcResponse {