Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 9b52412 | 2016-02-18 08:23:08 -0800 | [diff] [blame] | 3 | * Copyright 2016, Google Inc. |
Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame^] | 34 | #include "src/core/lib/surface/channel_init.h" |
Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 35 | |
| 36 | #include <grpc/support/alloc.h> |
| 37 | #include <grpc/support/useful.h> |
| 38 | |
| 39 | typedef struct stage_slot { |
| 40 | grpc_channel_init_stage fn; |
| 41 | void *arg; |
| 42 | int priority; |
| 43 | size_t insertion_order; |
| 44 | } stage_slot; |
| 45 | |
| 46 | typedef struct stage_slots { |
| 47 | stage_slot *slots; |
| 48 | size_t num_slots; |
| 49 | size_t cap_slots; |
| 50 | } stage_slots; |
| 51 | |
| 52 | static stage_slots g_slots[GRPC_NUM_CHANNEL_STACK_TYPES]; |
| 53 | static bool g_finalized; |
| 54 | |
| 55 | void grpc_channel_init_init(void) { |
| 56 | for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| 57 | g_slots[i].slots = NULL; |
| 58 | g_slots[i].num_slots = 0; |
| 59 | g_slots[i].cap_slots = 0; |
| 60 | } |
| 61 | g_finalized = false; |
| 62 | } |
| 63 | |
| 64 | void grpc_channel_init_register_stage(grpc_channel_stack_type type, |
| 65 | int priority, |
| 66 | grpc_channel_init_stage stage, |
| 67 | void *stage_arg) { |
| 68 | GPR_ASSERT(!g_finalized); |
| 69 | if (g_slots[type].cap_slots == g_slots[type].num_slots) { |
| 70 | g_slots[type].cap_slots = GPR_MAX(8, 3 * g_slots[type].cap_slots / 2); |
| 71 | g_slots[type].slots = |
| 72 | gpr_realloc(g_slots[type].slots, |
| 73 | g_slots[type].cap_slots * sizeof(*g_slots[type].slots)); |
| 74 | } |
| 75 | stage_slot *s = &g_slots[type].slots[g_slots[type].num_slots++]; |
| 76 | s->insertion_order = g_slots[type].num_slots; |
| 77 | s->priority = priority; |
| 78 | s->fn = stage; |
| 79 | s->arg = stage_arg; |
| 80 | } |
| 81 | |
| 82 | static int compare_slots(const void *a, const void *b) { |
| 83 | const stage_slot *sa = a; |
| 84 | const stage_slot *sb = b; |
| 85 | |
| 86 | int c = GPR_ICMP(sa->priority, sb->priority); |
| 87 | if (c != 0) return c; |
| 88 | return GPR_ICMP(sa->insertion_order, sb->insertion_order); |
| 89 | } |
| 90 | |
| 91 | void grpc_channel_init_finalize(void) { |
| 92 | GPR_ASSERT(!g_finalized); |
| 93 | for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| 94 | qsort(g_slots[i].slots, g_slots[i].num_slots, sizeof(*g_slots[i].slots), |
| 95 | compare_slots); |
| 96 | } |
| 97 | g_finalized = true; |
| 98 | } |
| 99 | |
| 100 | void grpc_channel_init_shutdown(void) { |
| 101 | for (int i = 0; i < GRPC_NUM_CHANNEL_STACK_TYPES; i++) { |
| 102 | gpr_free(g_slots[i].slots); |
Craig Tiller | 3d2686b | 2016-03-21 07:12:54 -0700 | [diff] [blame] | 103 | g_slots[i].slots = (void *)(uintptr_t)0xdeadbeef; |
Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 104 | } |
| 105 | } |
| 106 | |
| 107 | static const char *name_for_type(grpc_channel_stack_type type) { |
| 108 | switch (type) { |
| 109 | case GRPC_CLIENT_CHANNEL: |
| 110 | return "CLIENT_CHANNEL"; |
| 111 | case GRPC_CLIENT_SUBCHANNEL: |
| 112 | return "CLIENT_SUBCHANNEL"; |
| 113 | case GRPC_SERVER_CHANNEL: |
| 114 | return "SERVER_CHANNEL"; |
Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 115 | case GRPC_CLIENT_LAME_CHANNEL: |
| 116 | return "CLIENT_LAME_CHANNEL"; |
Craig Tiller | de67626 | 2016-02-19 12:28:34 -0800 | [diff] [blame] | 117 | case GRPC_CLIENT_DIRECT_CHANNEL: |
| 118 | return "CLIENT_DIRECT_CHANNEL"; |
Craig Tiller | 178edfa | 2016-02-17 20:54:46 -0800 | [diff] [blame] | 119 | case GRPC_NUM_CHANNEL_STACK_TYPES: |
| 120 | break; |
| 121 | } |
| 122 | GPR_UNREACHABLE_CODE(return "UNKNOWN"); |
| 123 | } |
| 124 | |
| 125 | void *grpc_channel_init_create_stack( |
| 126 | grpc_exec_ctx *exec_ctx, grpc_channel_stack_type type, size_t prefix_bytes, |
| 127 | const grpc_channel_args *args, int initial_refs, grpc_iomgr_cb_func destroy, |
| 128 | void *destroy_arg, grpc_transport *transport) { |
| 129 | GPR_ASSERT(g_finalized); |
| 130 | |
| 131 | grpc_channel_stack_builder *builder = grpc_channel_stack_builder_create(); |
| 132 | grpc_channel_stack_builder_set_name(builder, name_for_type(type)); |
| 133 | grpc_channel_stack_builder_set_channel_arguments(builder, args); |
| 134 | grpc_channel_stack_builder_set_transport(builder, transport); |
| 135 | |
| 136 | for (size_t i = 0; i < g_slots[type].num_slots; i++) { |
| 137 | const stage_slot *slot = &g_slots[type].slots[i]; |
| 138 | if (!slot->fn(builder, slot->arg)) { |
| 139 | grpc_channel_stack_builder_destroy(builder); |
| 140 | return NULL; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | return grpc_channel_stack_builder_finish(exec_ctx, builder, prefix_bytes, |
| 145 | initial_refs, destroy, destroy_arg); |
| 146 | } |