Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 6169d5f | 2016-03-31 07:46:18 -0700 | [diff] [blame] | 3 | * Copyright 2015, Google Inc. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -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/transport/metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 35 | |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 36 | #include <assert.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 37 | #include <stddef.h> |
| 38 | #include <string.h> |
| 39 | |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 40 | #include <grpc/compression.h> |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 41 | #include <grpc/grpc.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 42 | #include <grpc/support/alloc.h> |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 43 | #include <grpc/support/atm.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 44 | #include <grpc/support/log.h> |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 45 | #include <grpc/support/string_util.h> |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 46 | #include <grpc/support/time.h> |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 47 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 48 | #include "src/core/lib/iomgr/iomgr_internal.h" |
| 49 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 50 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 51 | #include "src/core/lib/support/murmur_hash.h" |
| 52 | #include "src/core/lib/support/string.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 53 | #include "src/core/lib/transport/static_metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 54 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 55 | /* There are two kinds of mdelem and mdstr instances. |
| 56 | * Static instances are declared in static_metadata.{h,c} and |
| 57 | * are initialized by grpc_mdctx_global_init(). |
| 58 | * Dynamic instances are stored in hash tables on grpc_mdctx, and are backed |
| 59 | * by internal_string and internal_element structures. |
| 60 | * Internal helper functions here-in (is_mdstr_static, is_mdelem_static) are |
| 61 | * used to determine which kind of element a pointer refers to. |
| 62 | */ |
| 63 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 64 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 65 | #define DEBUG_ARGS , const char *file, int line |
| 66 | #define FWD_DEBUG_ARGS , file, line |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 67 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s), __FILE__, __LINE__) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 68 | #else |
| 69 | #define DEBUG_ARGS |
| 70 | #define FWD_DEBUG_ARGS |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 71 | #define REF_MD_LOCKED(shard, s) ref_md_locked((shard), (s)) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 72 | #endif |
| 73 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 74 | #define INITIAL_SHARD_CAPACITY 8 |
| 75 | #define LOG2_SHARD_COUNT 4 |
| 76 | #define SHARD_COUNT ((size_t)(1 << LOG2_SHARD_COUNT)) |
| 77 | |
| 78 | #define TABLE_IDX(hash, capacity) (((hash) >> (LOG2_SHARD_COUNT)) % (capacity)) |
| 79 | #define SHARD_IDX(hash) ((hash) & ((1 << (LOG2_SHARD_COUNT)) - 1)) |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 80 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 81 | typedef void (*destroy_user_data_func)(void *user_data); |
| 82 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 83 | /* Shadow structure for grpc_mdelem_data for non-static elements */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 84 | typedef struct internal_metadata { |
| 85 | /* must be byte compatible with grpc_mdelem */ |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 86 | grpc_slice key; |
| 87 | grpc_slice value; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 88 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 89 | /* private only data */ |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 90 | gpr_atm refcnt; |
| 91 | |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 92 | gpr_mu mu_user_data; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 93 | gpr_atm destroy_user_data; |
| 94 | gpr_atm user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 95 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 96 | struct internal_metadata *bucket_next; |
| 97 | } internal_metadata; |
| 98 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 99 | typedef struct mdtab_shard { |
| 100 | gpr_mu mu; |
| 101 | internal_metadata **elems; |
| 102 | size_t count; |
| 103 | size_t capacity; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 104 | /** Estimate of the number of unreferenced mdelems in the hash table. |
| 105 | This will eventually converge to the exact number, but it's instantaneous |
| 106 | accuracy is not guaranteed */ |
| 107 | gpr_atm free_estimate; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 108 | } mdtab_shard; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 109 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 110 | static mdtab_shard g_shards[SHARD_COUNT]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 111 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 112 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 113 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 114 | void grpc_mdctx_global_init(void) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 115 | /* initialize shards */ |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 116 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 117 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 118 | gpr_mu_init(&shard->mu); |
| 119 | shard->count = 0; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 120 | gpr_atm_no_barrier_store(&shard->free_estimate, 0); |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 121 | shard->capacity = INITIAL_SHARD_CAPACITY; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 122 | shard->elems = gpr_malloc(sizeof(*shard->elems) * shard->capacity); |
| 123 | memset(shard->elems, 0, sizeof(*shard->elems) * shard->capacity); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 124 | } |
| 125 | } |
| 126 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 127 | void grpc_mdctx_global_shutdown(grpc_exec_ctx *exec_ctx) { |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 128 | for (size_t i = 0; i < SHARD_COUNT; i++) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 129 | mdtab_shard *shard = &g_shards[i]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 130 | gpr_mu_destroy(&shard->mu); |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 131 | gc_mdtab(exec_ctx, shard); |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 132 | /* TODO(ctiller): GPR_ASSERT(shard->count == 0); */ |
| 133 | if (shard->count != 0) { |
Yuchen Zeng | 64c0e8d | 2016-06-10 11:19:51 -0700 | [diff] [blame] | 134 | gpr_log(GPR_DEBUG, "WARNING: %" PRIuPTR " metadata elements were leaked", |
yang-g | d88e1d8 | 2015-12-02 13:23:33 -0800 | [diff] [blame] | 135 | shard->count); |
Craig Tiller | 0cb803d | 2016-03-02 22:17:24 -0800 | [diff] [blame] | 136 | if (grpc_iomgr_abort_on_leaks()) { |
| 137 | abort(); |
| 138 | } |
Craig Tiller | 3407544 | 2015-11-23 16:16:54 -0800 | [diff] [blame] | 139 | } |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 140 | gpr_free(shard->elems); |
| 141 | } |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 142 | } |
| 143 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 144 | static int is_mdelem_static(grpc_mdelem e) { |
| 145 | return e.payload >= &grpc_static_mdelem_table[0] && |
| 146 | e.payload < &grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 147 | } |
| 148 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 149 | static void ref_md_locked(mdtab_shard *shard, |
| 150 | internal_metadata *md DEBUG_ARGS) { |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 151 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 152 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 153 | "ELM REF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 154 | gpr_atm_no_barrier_load(&md->refcnt), |
| 155 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 156 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 157 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 158 | #endif |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 159 | if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 1)) { |
| 160 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 161 | } |
| 162 | } |
| 163 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 164 | static void gc_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 165 | size_t i; |
| 166 | internal_metadata **prev_next; |
| 167 | internal_metadata *md, *next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 168 | gpr_atm num_freed = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 169 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 170 | GPR_TIMER_BEGIN("gc_mdtab", 0); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 171 | for (i = 0; i < shard->capacity; i++) { |
| 172 | prev_next = &shard->elems[i]; |
| 173 | for (md = shard->elems[i]; md; md = next) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 174 | void *user_data = (void *)gpr_atm_no_barrier_load(&md->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 175 | next = md->bucket_next; |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 176 | if (gpr_atm_acq_load(&md->refcnt) == 0) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 177 | grpc_slice_unref_internal(exec_ctx, md->key); |
| 178 | grpc_slice_unref_internal(exec_ctx, md->value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 179 | if (md->user_data) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 180 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 181 | &md->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 182 | } |
| 183 | gpr_free(md); |
| 184 | *prev_next = next; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 185 | num_freed++; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 186 | shard->count--; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 187 | } else { |
| 188 | prev_next = &md->bucket_next; |
| 189 | } |
| 190 | } |
| 191 | } |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 192 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -num_freed); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 193 | GPR_TIMER_END("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 194 | } |
| 195 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 196 | static void grow_mdtab(mdtab_shard *shard) { |
| 197 | size_t capacity = shard->capacity * 2; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 198 | size_t i; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 199 | internal_metadata **mdtab; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 200 | internal_metadata *md, *next; |
Craig Tiller | 7536af0 | 2015-12-22 13:49:30 -0800 | [diff] [blame] | 201 | uint32_t hash; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 202 | |
| 203 | GPR_TIMER_BEGIN("grow_mdtab", 0); |
| 204 | |
| 205 | mdtab = gpr_malloc(sizeof(internal_metadata *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 206 | memset(mdtab, 0, sizeof(internal_metadata *) * capacity); |
| 207 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 208 | for (i = 0; i < shard->capacity; i++) { |
| 209 | for (md = shard->elems[i]; md; md = next) { |
| 210 | size_t idx; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 211 | hash = GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), |
| 212 | grpc_slice_hash(md->value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 213 | next = md->bucket_next; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 214 | idx = TABLE_IDX(hash, capacity); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 215 | md->bucket_next = mdtab[idx]; |
| 216 | mdtab[idx] = md; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 217 | } |
| 218 | } |
| 219 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 220 | gpr_free(shard->elems); |
| 221 | shard->elems = mdtab; |
| 222 | shard->capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 223 | |
| 224 | GPR_TIMER_END("grow_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 225 | } |
| 226 | |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 227 | static void rehash_mdtab(grpc_exec_ctx *exec_ctx, mdtab_shard *shard) { |
Craig Tiller | 139098c | 2016-06-06 08:10:08 -0700 | [diff] [blame] | 228 | if (gpr_atm_no_barrier_load(&shard->free_estimate) > |
| 229 | (gpr_atm)(shard->capacity / 4)) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 230 | gc_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 231 | } else { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 232 | grow_mdtab(shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 236 | grpc_mdelem grpc_mdelem_from_slices(grpc_exec_ctx *exec_ctx, grpc_slice key, |
| 237 | grpc_slice value) { |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 238 | grpc_slice_static_intern(&key); |
| 239 | grpc_slice_static_intern(&value); |
| 240 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 241 | grpc_mdelem static_elem = grpc_static_mdelem_for_static_strings( |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 242 | grpc_static_metadata_index(key), grpc_static_metadata_index(value)); |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 243 | if (!GRPC_MDISNULL(static_elem)) { |
Craig Tiller | 1ad51e0 | 2016-11-17 16:42:21 -0800 | [diff] [blame] | 244 | return static_elem; |
| 245 | } |
| 246 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 247 | uint32_t hash = |
| 248 | GRPC_MDSTR_KV_HASH(grpc_slice_hash(key), grpc_slice_hash(value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 249 | internal_metadata *md; |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 250 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 251 | size_t idx; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 252 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 253 | GPR_TIMER_BEGIN("grpc_mdelem_from_metadata_strings", 0); |
| 254 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 255 | gpr_mu_lock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 256 | |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 257 | idx = TABLE_IDX(hash, shard->capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 258 | /* search for an existing pair */ |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 259 | for (md = shard->elems[idx]; md; md = md->bucket_next) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 260 | if (grpc_slice_cmp(key, md->key) == 0 && |
| 261 | grpc_slice_cmp(value, md->value) == 0) { |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 262 | REF_MD_LOCKED(shard, md); |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 263 | gpr_mu_unlock(&shard->mu); |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 264 | grpc_slice_unref_internal(exec_ctx, key); |
| 265 | grpc_slice_unref_internal(exec_ctx, value); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 266 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 267 | return (grpc_mdelem){(grpc_mdelem_data *)md}; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 268 | } |
| 269 | } |
| 270 | |
| 271 | /* not found: create a new pair */ |
| 272 | md = gpr_malloc(sizeof(internal_metadata)); |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 273 | gpr_atm_rel_store(&md->refcnt, 1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 274 | md->key = key; |
| 275 | md->value = value; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 276 | md->user_data = 0; |
| 277 | md->destroy_user_data = 0; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 278 | md->bucket_next = shard->elems[idx]; |
| 279 | shard->elems[idx] = md; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 280 | gpr_mu_init(&md->mu_user_data); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 281 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 282 | gpr_log(GPR_DEBUG, "ELM NEW:%p:%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 283 | gpr_atm_no_barrier_load(&md->refcnt), |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 284 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 285 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 286 | #endif |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 287 | shard->count++; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 288 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 289 | if (shard->count > shard->capacity * 2) { |
Craig Tiller | a59c16c | 2016-10-31 07:25:01 -0700 | [diff] [blame] | 290 | rehash_mdtab(exec_ctx, shard); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 291 | } |
| 292 | |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 293 | gpr_mu_unlock(&shard->mu); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 294 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 295 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
| 296 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 297 | return (grpc_mdelem){(grpc_mdelem_data *)md}; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 298 | } |
| 299 | |
yang-g | 24ba7c1 | 2016-03-30 16:19:43 -0700 | [diff] [blame] | 300 | static size_t get_base64_encoded_size(size_t raw_length) { |
| 301 | static const uint8_t tail_xtra[3] = {0, 2, 3}; |
| 302 | return raw_length / 3 * 4 + tail_xtra[raw_length % 3]; |
| 303 | } |
| 304 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 305 | size_t grpc_mdelem_get_size_in_hpack_table(grpc_mdelem elem) { |
| 306 | size_t overhead_and_key = 32 + GRPC_SLICE_LENGTH(GRPC_MDKEY(elem)); |
| 307 | size_t value_len = GRPC_SLICE_LENGTH(GRPC_MDVALUE(elem)); |
| 308 | if (grpc_is_binary_header(GRPC_MDKEY(elem))) { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 309 | return overhead_and_key + get_base64_encoded_size(value_len); |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 310 | } else { |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 311 | return overhead_and_key + value_len; |
yang-g | cb7a802 | 2016-03-30 14:58:53 -0700 | [diff] [blame] | 312 | } |
| 313 | } |
| 314 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 315 | grpc_mdelem grpc_mdelem_ref(grpc_mdelem gmd DEBUG_ARGS) { |
| 316 | internal_metadata *md = (internal_metadata *)gmd.payload; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 317 | if (is_mdelem_static(gmd)) return gmd; |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 318 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 319 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 320 | "ELM REF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 321 | gpr_atm_no_barrier_load(&md->refcnt), |
| 322 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 323 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 324 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 325 | #endif |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 326 | /* we can assume the ref count is >= 1 as the application is calling |
| 327 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 328 | simplifying the logic here to be just an atomic increment */ |
| 329 | /* use C assert to have this removed in opt builds */ |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 330 | GPR_ASSERT(gpr_atm_no_barrier_load(&md->refcnt) >= 1); |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 331 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 332 | return gmd; |
| 333 | } |
| 334 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 335 | void grpc_mdelem_unref(grpc_exec_ctx *exec_ctx, grpc_mdelem gmd DEBUG_ARGS) { |
| 336 | internal_metadata *md = (internal_metadata *)gmd.payload; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 337 | if (!md) return; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 338 | if (is_mdelem_static(gmd)) return; |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 339 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 340 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 341 | "ELM UNREF:%p:%zu->%zu: '%s' = '%s'", (void *)md, |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 342 | gpr_atm_no_barrier_load(&md->refcnt), |
| 343 | gpr_atm_no_barrier_load(&md->refcnt) - 1, |
Craig Tiller | 5ef31ab | 2016-11-10 16:27:48 -0800 | [diff] [blame] | 344 | grpc_mdstr_as_c_string((grpc_slice)md->key), |
| 345 | grpc_mdstr_as_c_string((grpc_slice)md->value)); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 346 | #endif |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 347 | uint32_t hash = |
| 348 | GRPC_MDSTR_KV_HASH(grpc_slice_hash(md->key), grpc_slice_hash(md->value)); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 349 | const gpr_atm prev_refcount = gpr_atm_full_fetch_add(&md->refcnt, -1); |
| 350 | GPR_ASSERT(prev_refcount >= 1); |
| 351 | if (1 == prev_refcount) { |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 352 | /* once the refcount hits zero, some other thread can come along and |
| 353 | free md at any time: it's unsafe from this point on to access it */ |
Craig Tiller | e52bbb1 | 2016-11-10 15:34:06 -0800 | [diff] [blame] | 354 | mdtab_shard *shard = &g_shards[SHARD_IDX(hash)]; |
Craig Tiller | 8d8f9a8 | 2016-06-03 08:49:11 -0700 | [diff] [blame] | 355 | gpr_atm_no_barrier_fetch_add(&shard->free_estimate, 1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 356 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 357 | } |
| 358 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 359 | void *grpc_mdelem_get_user_data(grpc_mdelem md, void (*destroy_func)(void *)) { |
| 360 | internal_metadata *im = (internal_metadata *)md.payload; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 361 | void *result; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 362 | if (is_mdelem_static(md)) { |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 363 | return (void *) |
| 364 | grpc_static_mdelem_user_data[md.payload - grpc_static_mdelem_table]; |
Craig Tiller | b2b4261 | 2015-11-20 12:02:17 -0800 | [diff] [blame] | 365 | } |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 366 | if (gpr_atm_acq_load(&im->destroy_user_data) == (gpr_atm)destroy_func) { |
| 367 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 368 | } else { |
| 369 | return NULL; |
| 370 | } |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 371 | return result; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 372 | } |
| 373 | |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 374 | void *grpc_mdelem_set_user_data(grpc_mdelem md, void (*destroy_func)(void *), |
Craig Tiller | 738e6db | 2016-11-15 09:29:44 -0800 | [diff] [blame] | 375 | void *user_data) { |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 376 | internal_metadata *im = (internal_metadata *)md.payload; |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame] | 377 | GPR_ASSERT(!is_mdelem_static(md)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 378 | GPR_ASSERT((user_data == NULL) == (destroy_func == NULL)); |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 379 | gpr_mu_lock(&im->mu_user_data); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 380 | if (gpr_atm_no_barrier_load(&im->destroy_user_data)) { |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 381 | /* user data can only be set once */ |
| 382 | gpr_mu_unlock(&im->mu_user_data); |
| 383 | if (destroy_func != NULL) { |
| 384 | destroy_func(user_data); |
| 385 | } |
Craig Tiller | 738e6db | 2016-11-15 09:29:44 -0800 | [diff] [blame] | 386 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 387 | } |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 388 | gpr_atm_no_barrier_store(&im->user_data, (gpr_atm)user_data); |
| 389 | gpr_atm_rel_store(&im->destroy_user_data, (gpr_atm)destroy_func); |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 390 | gpr_mu_unlock(&im->mu_user_data); |
Craig Tiller | 738e6db | 2016-11-15 09:29:44 -0800 | [diff] [blame] | 391 | return user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 392 | } |
Craig Tiller | 0160de9 | 2016-11-18 08:46:46 -0800 | [diff] [blame^] | 393 | |
| 394 | bool grpc_mdelem_eq(grpc_mdelem a, grpc_mdelem b) { |
| 395 | if (a.payload == b.payload) return true; |
| 396 | return 0 == grpc_slice_cmp(GRPC_MDKEY(a), GRPC_MDKEY(b)) && |
| 397 | 0 == grpc_slice_cmp(GRPC_MDVALUE(a), GRPC_MDVALUE(b)); |
| 398 | } |