David Garcia Quintas | 243fe9d | 2017-08-24 14:16:37 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2017 gRPC authors. |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include "src/core/lib/channel/channel_stack_builder.h" |
| 20 | |
| 21 | #include <limits.h> |
| 22 | #include <string.h> |
| 23 | |
| 24 | #include <grpc/support/alloc.h> |
| 25 | #include <grpc/support/log.h> |
| 26 | #include <grpc/support/string_util.h> |
| 27 | |
| 28 | #include "src/core/lib/slice/slice_internal.h" |
| 29 | #include "src/core/lib/surface/channel_init.h" |
| 30 | #include "test/core/util/test_config.h" |
| 31 | |
| 32 | static grpc_error *channel_init_func(grpc_exec_ctx *exec_ctx, |
| 33 | grpc_channel_element *elem, |
| 34 | grpc_channel_element_args *args) { |
| 35 | return GRPC_ERROR_NONE; |
| 36 | } |
| 37 | |
| 38 | static grpc_error *call_init_func(grpc_exec_ctx *exec_ctx, |
| 39 | grpc_call_element *elem, |
| 40 | const grpc_call_element_args *args) { |
| 41 | return GRPC_ERROR_NONE; |
| 42 | } |
| 43 | |
| 44 | static void channel_destroy_func(grpc_exec_ctx *exec_ctx, |
| 45 | grpc_channel_element *elem) {} |
| 46 | |
| 47 | static void call_destroy_func(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 48 | const grpc_call_final_info *final_info, |
| 49 | grpc_closure *ignored) {} |
| 50 | |
| 51 | static void call_func(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 52 | grpc_transport_stream_op_batch *op) {} |
| 53 | |
| 54 | static void channel_func(grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, |
| 55 | grpc_transport_op *op) { |
| 56 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
| 57 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
| 58 | } |
| 59 | GRPC_CLOSURE_SCHED(exec_ctx, op->on_consumed, GRPC_ERROR_NONE); |
| 60 | } |
| 61 | |
| 62 | static char *get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| 63 | return gpr_strdup("peer"); |
| 64 | } |
| 65 | |
| 66 | bool g_replacement_fn_called = false; |
| 67 | bool g_original_fn_called = false; |
| 68 | void set_arg_once_fn(grpc_channel_stack *channel_stack, |
| 69 | grpc_channel_element *elem, void *arg) { |
| 70 | bool *called = arg; |
| 71 | // Make sure this function is only called once per arg. |
| 72 | GPR_ASSERT(*called == false); |
| 73 | *called = true; |
| 74 | } |
| 75 | |
| 76 | static void test_channel_stack_builder_filter_replace(void) { |
| 77 | grpc_channel *channel = |
| 78 | grpc_insecure_channel_create("target name isn't used", NULL, NULL); |
| 79 | GPR_ASSERT(channel != NULL); |
| 80 | // Make sure the high priority filter has been created. |
| 81 | GPR_ASSERT(g_replacement_fn_called); |
| 82 | // ... and that the low priority one hasn't. |
| 83 | GPR_ASSERT(!g_original_fn_called); |
| 84 | grpc_channel_destroy(channel); |
| 85 | } |
| 86 | |
| 87 | const grpc_channel_filter replacement_filter = { |
| 88 | call_func, |
| 89 | channel_func, |
| 90 | 0, |
| 91 | call_init_func, |
| 92 | grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| 93 | call_destroy_func, |
| 94 | 0, |
| 95 | channel_init_func, |
| 96 | channel_destroy_func, |
| 97 | get_peer, |
| 98 | grpc_channel_next_get_info, |
| 99 | "filter_name"}; |
| 100 | |
| 101 | const grpc_channel_filter original_filter = { |
| 102 | call_func, |
| 103 | channel_func, |
| 104 | 0, |
| 105 | call_init_func, |
| 106 | grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| 107 | call_destroy_func, |
| 108 | 0, |
| 109 | channel_init_func, |
| 110 | channel_destroy_func, |
| 111 | get_peer, |
| 112 | grpc_channel_next_get_info, |
| 113 | "filter_name"}; |
| 114 | |
| 115 | static bool add_replacement_filter(grpc_exec_ctx *exec_ctx, |
| 116 | grpc_channel_stack_builder *builder, |
| 117 | void *arg) { |
| 118 | const grpc_channel_filter *filter = arg; |
| 119 | // Get rid of any other version of the filter, as determined by having the |
| 120 | // same name. |
| 121 | GPR_ASSERT(grpc_channel_stack_builder_remove_filter(builder, filter->name)); |
| 122 | return grpc_channel_stack_builder_prepend_filter( |
| 123 | builder, filter, set_arg_once_fn, &g_replacement_fn_called); |
| 124 | } |
| 125 | |
| 126 | static bool add_original_filter(grpc_exec_ctx *exec_ctx, |
| 127 | grpc_channel_stack_builder *builder, |
| 128 | void *arg) { |
| 129 | return grpc_channel_stack_builder_prepend_filter( |
| 130 | builder, (const grpc_channel_filter *)arg, set_arg_once_fn, |
| 131 | &g_original_fn_called); |
| 132 | } |
| 133 | |
| 134 | static void init_plugin(void) { |
| 135 | grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX, |
| 136 | add_original_filter, |
| 137 | (void *)&original_filter); |
| 138 | grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX, |
| 139 | add_replacement_filter, |
| 140 | (void *)&replacement_filter); |
| 141 | } |
| 142 | |
| 143 | static void destroy_plugin(void) {} |
| 144 | |
| 145 | int main(int argc, char **argv) { |
| 146 | grpc_test_init(argc, argv); |
| 147 | grpc_register_plugin(init_plugin, destroy_plugin); |
| 148 | grpc_init(); |
| 149 | test_channel_stack_builder_filter_replace(); |
| 150 | grpc_shutdown(); |
| 151 | return 0; |
| 152 | } |