Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 0605995 | 2015-02-18 08:34:56 -0800 | [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 | |
| 34 | #include "src/core/transport/metadata.h" |
| 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> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 41 | #include <grpc/support/alloc.h> |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 42 | #include <grpc/support/atm.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 43 | #include <grpc/support/log.h> |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 44 | #include <grpc/support/string_util.h> |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 45 | #include <grpc/support/time.h> |
| 46 | #include "src/core/profiling/timers.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 47 | #include "src/core/support/murmur_hash.h" |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 48 | #include "src/core/support/string.h" |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 49 | #include "src/core/transport/chttp2/bin_encoder.h" |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 50 | #include "src/core/transport/static_metadata.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 51 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 52 | /* There are two kinds of mdelem and mdstr instances. |
| 53 | * Static instances are declared in static_metadata.{h,c} and |
| 54 | * are initialized by grpc_mdctx_global_init(). |
| 55 | * Dynamic instances are stored in hash tables on grpc_mdctx, and are backed |
| 56 | * by internal_string and internal_element structures. |
| 57 | * Internal helper functions here-in (is_mdstr_static, is_mdelem_static) are |
| 58 | * used to determine which kind of element a pointer refers to. |
| 59 | */ |
| 60 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 61 | #define INITIAL_STRTAB_CAPACITY 4 |
| 62 | #define INITIAL_MDTAB_CAPACITY 4 |
| 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 | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 67 | #define INTERNAL_STRING_REF(s) \ |
| 68 | if (is_mdstr_static((grpc_mdstr *)(s))) \ |
| 69 | ; \ |
| 70 | else \ |
| 71 | internal_string_ref((s), __FILE__, __LINE__) |
| 72 | #define INTERNAL_STRING_UNREF(s) \ |
| 73 | if (is_mdstr_static((grpc_mdstr *)(s))) \ |
| 74 | ; \ |
| 75 | else \ |
| 76 | internal_string_unref((s), __FILE__, __LINE__) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 77 | #define REF_MD_LOCKED(s) ref_md_locked((s), __FILE__, __LINE__) |
| 78 | #else |
| 79 | #define DEBUG_ARGS |
| 80 | #define FWD_DEBUG_ARGS |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 81 | #define INTERNAL_STRING_REF(s) \ |
| 82 | if (is_mdstr_static((grpc_mdstr *)(s))) \ |
| 83 | ; \ |
| 84 | else \ |
| 85 | internal_string_ref((s)) |
| 86 | #define INTERNAL_STRING_UNREF(s) \ |
| 87 | if (is_mdstr_static((grpc_mdstr *)(s))) \ |
| 88 | ; \ |
| 89 | else \ |
| 90 | internal_string_unref((s)) |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 91 | #define REF_MD_LOCKED(s) ref_md_locked((s)) |
| 92 | #endif |
| 93 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 94 | typedef void (*destroy_user_data_func)(void *user_data); |
| 95 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 96 | /* Shadow structure for grpc_mdstr for non-static values */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 97 | typedef struct internal_string { |
| 98 | /* must be byte compatible with grpc_mdstr */ |
| 99 | gpr_slice slice; |
| 100 | gpr_uint32 hash; |
| 101 | |
| 102 | /* private only data */ |
| 103 | gpr_uint32 refs; |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 104 | gpr_uint8 has_base64_and_huffman_encoded; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 105 | gpr_slice_refcount refcount; |
| 106 | |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 107 | gpr_slice base64_and_huffman; |
| 108 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 109 | grpc_mdctx *context; |
| 110 | |
| 111 | struct internal_string *bucket_next; |
| 112 | } internal_string; |
| 113 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 114 | /* Shadow structure for grpc_mdelem for non-static elements */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 115 | typedef struct internal_metadata { |
| 116 | /* must be byte compatible with grpc_mdelem */ |
| 117 | internal_string *key; |
| 118 | internal_string *value; |
| 119 | |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 120 | gpr_atm refcnt; |
| 121 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 122 | /* private only data */ |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 123 | gpr_mu mu_user_data; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 124 | gpr_atm destroy_user_data; |
| 125 | gpr_atm user_data; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 126 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 127 | grpc_mdctx *context; |
| 128 | struct internal_metadata *bucket_next; |
| 129 | } internal_metadata; |
| 130 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 131 | typedef struct static_string { |
| 132 | grpc_mdstr *mdstr; |
| 133 | gpr_uint32 hash; |
| 134 | } static_string; |
| 135 | |
| 136 | typedef struct static_mdelem { |
| 137 | grpc_mdelem *mdelem; |
| 138 | gpr_uint32 hash; |
| 139 | } static_mdelem; |
| 140 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 141 | struct grpc_mdctx { |
| 142 | gpr_uint32 hash_seed; |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 143 | int refs; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 144 | |
| 145 | gpr_mu mu; |
| 146 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 147 | /* linearly probed hash tables for static element lookup */ |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 148 | static_string static_strtab[GRPC_STATIC_MDSTR_COUNT * 2]; |
| 149 | static_mdelem static_mdtab[GRPC_STATIC_MDELEM_COUNT * 2]; |
| 150 | size_t static_strtab_maxprobe; |
| 151 | size_t static_mdtab_maxprobe; |
| 152 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 153 | /* chained hash table of dynamically allocated strings */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 154 | internal_string **strtab; |
| 155 | size_t strtab_count; |
| 156 | size_t strtab_capacity; |
| 157 | |
Craig Tiller | 70b080d | 2015-11-19 08:04:48 -0800 | [diff] [blame] | 158 | /* chained hash table of dynamically allocated mdelems */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 159 | internal_metadata **mdtab; |
| 160 | size_t mdtab_count; |
| 161 | size_t mdtab_free; |
| 162 | size_t mdtab_capacity; |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 163 | |
| 164 | /* cache slots */ |
| 165 | gpr_atm cache_slots[GRPC_MDELEM_CACHE_SLOT_COUNT]; |
| 166 | /* compression algorithm mdelems: one per algorithm bitmask */ |
| 167 | gpr_atm compression_algorithm_mdelem[1 << GRPC_COMPRESS_ALGORITHMS_COUNT]; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 168 | }; |
| 169 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 170 | static void internal_string_ref(internal_string *s DEBUG_ARGS); |
| 171 | static void internal_string_unref(internal_string *s DEBUG_ARGS); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 172 | static void discard_metadata(grpc_mdctx *ctx); |
| 173 | static void gc_mdtab(grpc_mdctx *ctx); |
Vijay Pai | 7d3d9ca | 2015-04-02 14:34:27 -0700 | [diff] [blame] | 174 | static void metadata_context_destroy_locked(grpc_mdctx *ctx); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 175 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 176 | void grpc_mdctx_global_init(void) { |
| 177 | size_t i; |
| 178 | for (i = 0; i < GRPC_STATIC_MDSTR_COUNT; i++) { |
| 179 | grpc_mdstr *elem = &grpc_static_mdstr_table[i]; |
| 180 | const char *str = grpc_static_metadata_strings[i]; |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 181 | *(gpr_slice *)&elem->slice = gpr_slice_from_static_string(str); |
| 182 | *(gpr_uint32 *)&elem->hash = gpr_murmur_hash3(str, strlen(str), 0); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 183 | } |
| 184 | for (i = 0; i < GRPC_STATIC_MDELEM_COUNT; i++) { |
| 185 | grpc_mdelem *elem = &grpc_static_mdelem_table[i]; |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 186 | grpc_mdstr *key = |
| 187 | &grpc_static_mdstr_table[grpc_static_metadata_elem_indices[2 * i + 0]]; |
| 188 | grpc_mdstr *value = |
| 189 | &grpc_static_mdstr_table[grpc_static_metadata_elem_indices[2 * i + 1]]; |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 190 | *(grpc_mdstr **)&elem->key = key; |
| 191 | *(grpc_mdstr **)&elem->value = value; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 192 | } |
| 193 | } |
| 194 | |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 195 | void grpc_mdctx_global_shutdown(void) {} |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 196 | |
| 197 | static int is_mdstr_static(grpc_mdstr *s) { |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 198 | return s >= &grpc_static_mdstr_table[0] && |
| 199 | s < &grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | static int is_mdelem_static(grpc_mdelem *e) { |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 203 | return e >= &grpc_static_mdelem_table[0] && |
| 204 | e < &grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT]; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 205 | } |
| 206 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 207 | static void lock(grpc_mdctx *ctx) { gpr_mu_lock(&ctx->mu); } |
| 208 | |
| 209 | static void unlock(grpc_mdctx *ctx) { |
| 210 | /* If the context has been orphaned we'd like to delete it soon. We check |
| 211 | conditions in unlock as it signals the end of mutations on a context. |
| 212 | |
| 213 | We need to ensure all grpc_mdelem and grpc_mdstr elements have been deleted |
| 214 | first. This is equivalent to saying that both tables have zero counts, |
| 215 | which is equivalent to saying that strtab_count is zero (as mdelem's MUST |
| 216 | reference an mdstr for their key and value slots). |
| 217 | |
| 218 | To encourage that to happen, we start discarding zero reference count |
| 219 | mdelems on every unlock (instead of the usual 'I'm too loaded' trigger |
| 220 | case), since otherwise we can be stuck waiting for a garbage collection |
| 221 | that will never happen. */ |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 222 | if (ctx->refs == 0) { |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 223 | /* uncomment if you're having trouble diagnosing an mdelem leak to make |
| 224 | things clearer (slows down destruction a lot, however) */ |
Craig Tiller | 45ce927 | 2015-07-31 11:22:35 -0700 | [diff] [blame] | 225 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
Craig Tiller | 0d4836d | 2015-06-30 15:15:43 -0700 | [diff] [blame] | 226 | gc_mdtab(ctx); |
Craig Tiller | 45ce927 | 2015-07-31 11:22:35 -0700 | [diff] [blame] | 227 | #endif |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 228 | if (ctx->mdtab_count && ctx->mdtab_count == ctx->mdtab_free) { |
| 229 | discard_metadata(ctx); |
| 230 | } |
| 231 | if (ctx->strtab_count == 0) { |
Vijay Pai | 7d3d9ca | 2015-04-02 14:34:27 -0700 | [diff] [blame] | 232 | metadata_context_destroy_locked(ctx); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 233 | return; |
| 234 | } |
| 235 | } |
| 236 | gpr_mu_unlock(&ctx->mu); |
| 237 | } |
| 238 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 239 | static void ref_md_locked(internal_metadata *md DEBUG_ARGS) { |
| 240 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 241 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 242 | "ELM REF:%p:%d->%d: '%s' = '%s'", md, |
| 243 | gpr_atm_no_barrier_load(&md->refcnt), |
| 244 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
| 245 | grpc_mdstr_as_c_string((grpc_mdstr *)md->key), |
| 246 | grpc_mdstr_as_c_string((grpc_mdstr *)md->value)); |
| 247 | #endif |
Craig Tiller | b8e8267 | 2015-10-10 13:52:47 -0700 | [diff] [blame] | 248 | if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 2)) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 249 | md->context->mdtab_free--; |
Craig Tiller | b8e8267 | 2015-10-10 13:52:47 -0700 | [diff] [blame] | 250 | } else { |
| 251 | GPR_ASSERT(1 != gpr_atm_no_barrier_fetch_add(&md->refcnt, -1)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | |
| 255 | grpc_mdctx *grpc_mdctx_create_with_seed(gpr_uint32 seed) { |
| 256 | grpc_mdctx *ctx = gpr_malloc(sizeof(grpc_mdctx)); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 257 | size_t i, j; |
| 258 | |
| 259 | memset(ctx, 0, sizeof(*ctx)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 260 | |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 261 | ctx->refs = 1; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 262 | ctx->hash_seed = seed; |
| 263 | gpr_mu_init(&ctx->mu); |
| 264 | ctx->strtab = gpr_malloc(sizeof(internal_string *) * INITIAL_STRTAB_CAPACITY); |
| 265 | memset(ctx->strtab, 0, sizeof(grpc_mdstr *) * INITIAL_STRTAB_CAPACITY); |
| 266 | ctx->strtab_count = 0; |
| 267 | ctx->strtab_capacity = INITIAL_STRTAB_CAPACITY; |
| 268 | ctx->mdtab = gpr_malloc(sizeof(internal_metadata *) * INITIAL_MDTAB_CAPACITY); |
| 269 | memset(ctx->mdtab, 0, sizeof(grpc_mdelem *) * INITIAL_MDTAB_CAPACITY); |
| 270 | ctx->mdtab_count = 0; |
| 271 | ctx->mdtab_capacity = INITIAL_MDTAB_CAPACITY; |
| 272 | ctx->mdtab_free = 0; |
| 273 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 274 | for (i = 0; i < GRPC_STATIC_MDSTR_COUNT; i++) { |
| 275 | const char *str = grpc_static_metadata_strings[i]; |
| 276 | gpr_uint32 lup_hash = gpr_murmur_hash3(str, strlen(str), seed); |
| 277 | for (j = 0;; j++) { |
| 278 | size_t idx = (lup_hash + j) % GPR_ARRAY_SIZE(ctx->static_strtab); |
| 279 | if (ctx->static_strtab[idx].mdstr == NULL) { |
| 280 | ctx->static_strtab[idx].mdstr = &grpc_static_mdstr_table[i]; |
| 281 | ctx->static_strtab[idx].hash = lup_hash; |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | if (j > ctx->static_strtab_maxprobe) { |
| 286 | ctx->static_strtab_maxprobe = j; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | for (i = 0; i < GRPC_STATIC_MDELEM_COUNT; i++) { |
| 291 | grpc_mdelem *elem = &grpc_static_mdelem_table[i]; |
| 292 | gpr_uint32 hash = GRPC_MDSTR_KV_HASH(elem->key->hash, elem->value->hash); |
| 293 | for (j = 0;; j++) { |
| 294 | size_t idx = (hash + j) % GPR_ARRAY_SIZE(ctx->static_mdtab); |
| 295 | if (ctx->static_mdtab[idx].mdelem == NULL) { |
| 296 | ctx->static_mdtab[idx].mdelem = elem; |
| 297 | ctx->static_mdtab[idx].hash = hash; |
| 298 | break; |
| 299 | } |
| 300 | } |
| 301 | if (j > ctx->static_mdtab_maxprobe) { |
| 302 | ctx->static_mdtab_maxprobe = j; |
| 303 | } |
| 304 | } |
| 305 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 306 | return ctx; |
| 307 | } |
| 308 | |
Craig Tiller | 32946d3 | 2015-01-15 11:37:30 -0800 | [diff] [blame] | 309 | grpc_mdctx *grpc_mdctx_create(void) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 310 | /* This seed is used to prevent remote connections from controlling hash table |
| 311 | * collisions. It needs to be somewhat unpredictable to a remote connection. |
| 312 | */ |
Craig Tiller | 32ca48c | 2015-09-10 11:47:15 -0700 | [diff] [blame] | 313 | return grpc_mdctx_create_with_seed( |
| 314 | (gpr_uint32)gpr_now(GPR_CLOCK_REALTIME).tv_nsec); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 315 | } |
| 316 | |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 317 | static void drop_cached_elem(gpr_atm *slot) { |
| 318 | gpr_atm value = gpr_atm_no_barrier_load(slot); |
| 319 | gpr_atm_rel_store(slot, 0); |
| 320 | GRPC_MDELEM_UNREF((grpc_mdelem *)value); |
| 321 | } |
| 322 | |
| 323 | void grpc_mdctx_drop_caches(grpc_mdctx *ctx) { |
| 324 | size_t i; |
| 325 | for (i = 0; i < GRPC_MDELEM_CACHE_SLOT_COUNT; i++) { |
| 326 | drop_cached_elem(&ctx->cache_slots[i]); |
| 327 | } |
| 328 | for (i = 0; i < GPR_ARRAY_SIZE(ctx->compression_algorithm_mdelem); i++) { |
| 329 | drop_cached_elem(&ctx->compression_algorithm_mdelem[i]); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | static void set_cache(gpr_atm *slot, grpc_mdelem *elem) { |
| 334 | if (!gpr_atm_rel_cas(slot, 0, (gpr_atm)elem)) { |
| 335 | GRPC_MDELEM_UNREF(elem); |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | void grpc_mdctx_set_mdelem_cache(grpc_mdctx *ctx, grpc_mdelem_cache_slot slot, |
| 340 | grpc_mdelem *elem) { |
| 341 | set_cache(&ctx->cache_slots[slot], elem); |
| 342 | } |
| 343 | |
| 344 | static grpc_mdelem *get_cache(gpr_atm *slot) { |
| 345 | return (grpc_mdelem *)gpr_atm_acq_load(slot); |
| 346 | } |
| 347 | |
| 348 | grpc_mdelem *grpc_mdelem_from_cache(grpc_mdctx *ctx, |
| 349 | grpc_mdelem_cache_slot slot) { |
| 350 | return get_cache(&ctx->cache_slots[slot]); |
| 351 | } |
| 352 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 353 | static void discard_metadata(grpc_mdctx *ctx) { |
| 354 | size_t i; |
| 355 | internal_metadata *next, *cur; |
| 356 | |
| 357 | for (i = 0; i < ctx->mdtab_capacity; i++) { |
| 358 | cur = ctx->mdtab[i]; |
| 359 | while (cur) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 360 | void *user_data = (void *)gpr_atm_no_barrier_load(&cur->user_data); |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 361 | GPR_ASSERT(gpr_atm_acq_load(&cur->refcnt) == 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 362 | next = cur->bucket_next; |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 363 | INTERNAL_STRING_UNREF(cur->key); |
| 364 | INTERNAL_STRING_UNREF(cur->value); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 365 | if (user_data != NULL) { |
| 366 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 367 | &cur->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 368 | } |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 369 | gpr_mu_destroy(&cur->mu_user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 370 | gpr_free(cur); |
| 371 | cur = next; |
| 372 | ctx->mdtab_free--; |
| 373 | ctx->mdtab_count--; |
| 374 | } |
| 375 | ctx->mdtab[i] = NULL; |
| 376 | } |
| 377 | } |
| 378 | |
Vijay Pai | 7d3d9ca | 2015-04-02 14:34:27 -0700 | [diff] [blame] | 379 | static void metadata_context_destroy_locked(grpc_mdctx *ctx) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 380 | GPR_ASSERT(ctx->strtab_count == 0); |
| 381 | GPR_ASSERT(ctx->mdtab_count == 0); |
| 382 | GPR_ASSERT(ctx->mdtab_free == 0); |
| 383 | gpr_free(ctx->strtab); |
| 384 | gpr_free(ctx->mdtab); |
| 385 | gpr_mu_unlock(&ctx->mu); |
| 386 | gpr_mu_destroy(&ctx->mu); |
| 387 | gpr_free(ctx); |
| 388 | } |
| 389 | |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 390 | void grpc_mdctx_ref(grpc_mdctx *ctx) { |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 391 | GPR_TIMER_BEGIN("grpc_mdctx_ref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 392 | lock(ctx); |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 393 | GPR_ASSERT(ctx->refs > 0); |
| 394 | ctx->refs++; |
| 395 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 396 | GPR_TIMER_END("grpc_mdctx_ref", 0); |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | void grpc_mdctx_unref(grpc_mdctx *ctx) { |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 400 | GPR_TIMER_BEGIN("grpc_mdctx_unref", 0); |
Craig Tiller | 9be83ee | 2015-02-18 14:16:15 -0800 | [diff] [blame] | 401 | lock(ctx); |
| 402 | GPR_ASSERT(ctx->refs > 0); |
| 403 | ctx->refs--; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 404 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 405 | GPR_TIMER_END("grpc_mdctx_unref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | static void grow_strtab(grpc_mdctx *ctx) { |
| 409 | size_t capacity = ctx->strtab_capacity * 2; |
| 410 | size_t i; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 411 | internal_string **strtab; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 412 | internal_string *s, *next; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 413 | |
| 414 | GPR_TIMER_BEGIN("grow_strtab", 0); |
| 415 | |
| 416 | strtab = gpr_malloc(sizeof(internal_string *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 417 | memset(strtab, 0, sizeof(internal_string *) * capacity); |
| 418 | |
| 419 | for (i = 0; i < ctx->strtab_capacity; i++) { |
| 420 | for (s = ctx->strtab[i]; s; s = next) { |
| 421 | next = s->bucket_next; |
| 422 | s->bucket_next = strtab[s->hash % capacity]; |
| 423 | strtab[s->hash % capacity] = s; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | gpr_free(ctx->strtab); |
| 428 | ctx->strtab = strtab; |
| 429 | ctx->strtab_capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 430 | |
| 431 | GPR_TIMER_END("grow_strtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | static void internal_destroy_string(internal_string *is) { |
| 435 | internal_string **prev_next; |
| 436 | internal_string *cur; |
| 437 | grpc_mdctx *ctx = is->context; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 438 | GPR_TIMER_BEGIN("internal_destroy_string", 0); |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 439 | if (is->has_base64_and_huffman_encoded) { |
| 440 | gpr_slice_unref(is->base64_and_huffman); |
| 441 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 442 | for (prev_next = &ctx->strtab[is->hash % ctx->strtab_capacity], |
| 443 | cur = *prev_next; |
| 444 | cur != is; prev_next = &cur->bucket_next, cur = cur->bucket_next) |
| 445 | ; |
| 446 | *prev_next = cur->bucket_next; |
| 447 | ctx->strtab_count--; |
| 448 | gpr_free(is); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 449 | GPR_TIMER_END("internal_destroy_string", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 450 | } |
| 451 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 452 | static void internal_string_ref(internal_string *s DEBUG_ARGS) { |
| 453 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 454 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "STR REF:%p:%d->%d: '%s'", s, |
| 455 | s->refs, s->refs + 1, grpc_mdstr_as_c_string((grpc_mdstr *)s)); |
| 456 | #endif |
| 457 | ++s->refs; |
| 458 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 459 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 460 | static void internal_string_unref(internal_string *s DEBUG_ARGS) { |
| 461 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 462 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "STR UNREF:%p:%d->%d: '%s'", s, |
| 463 | s->refs, s->refs - 1, grpc_mdstr_as_c_string((grpc_mdstr *)s)); |
| 464 | #endif |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 465 | GPR_ASSERT(s->refs > 0); |
| 466 | if (0 == --s->refs) { |
| 467 | internal_destroy_string(s); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | static void slice_ref(void *p) { |
| 472 | internal_string *is = |
| 473 | (internal_string *)((char *)p - offsetof(internal_string, refcount)); |
| 474 | grpc_mdctx *ctx = is->context; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 475 | GPR_TIMER_BEGIN("slice_ref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 476 | lock(ctx); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 477 | INTERNAL_STRING_REF(is); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 478 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 479 | GPR_TIMER_END("slice_ref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static void slice_unref(void *p) { |
| 483 | internal_string *is = |
| 484 | (internal_string *)((char *)p - offsetof(internal_string, refcount)); |
| 485 | grpc_mdctx *ctx = is->context; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 486 | GPR_TIMER_BEGIN("slice_unref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 487 | lock(ctx); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 488 | INTERNAL_STRING_UNREF(is); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 489 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 490 | GPR_TIMER_END("slice_unref", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 491 | } |
| 492 | |
Craig Tiller | 4dbdd6a | 2015-09-25 15:12:16 -0700 | [diff] [blame] | 493 | grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 494 | return grpc_mdstr_from_buffer(ctx, (const gpr_uint8 *)str, strlen(str)); |
| 495 | } |
| 496 | |
| 497 | grpc_mdstr *grpc_mdstr_from_slice(grpc_mdctx *ctx, gpr_slice slice) { |
| 498 | grpc_mdstr *result = grpc_mdstr_from_buffer(ctx, GPR_SLICE_START_PTR(slice), |
| 499 | GPR_SLICE_LENGTH(slice)); |
| 500 | gpr_slice_unref(slice); |
| 501 | return result; |
| 502 | } |
| 503 | |
| 504 | grpc_mdstr *grpc_mdstr_from_buffer(grpc_mdctx *ctx, const gpr_uint8 *buf, |
| 505 | size_t length) { |
| 506 | gpr_uint32 hash = gpr_murmur_hash3(buf, length, ctx->hash_seed); |
| 507 | internal_string *s; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 508 | size_t i; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 509 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 510 | GPR_TIMER_BEGIN("grpc_mdstr_from_buffer", 0); |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 511 | |
| 512 | /* search for a static string */ |
| 513 | for (i = 0; i <= ctx->static_strtab_maxprobe; i++) { |
| 514 | size_t idx = (hash + i) % GPR_ARRAY_SIZE(ctx->static_strtab); |
| 515 | static_string *ss = &ctx->static_strtab[idx]; |
| 516 | if (ss->hash == hash && GPR_SLICE_LENGTH(ss->mdstr->slice) == length && |
| 517 | 0 == memcmp(buf, GPR_SLICE_START_PTR(ss->mdstr->slice), length)) { |
| 518 | return ss->mdstr; |
| 519 | } |
| 520 | } |
| 521 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 522 | lock(ctx); |
| 523 | |
| 524 | /* search for an existing string */ |
| 525 | for (s = ctx->strtab[hash % ctx->strtab_capacity]; s; s = s->bucket_next) { |
| 526 | if (s->hash == hash && GPR_SLICE_LENGTH(s->slice) == length && |
| 527 | 0 == memcmp(buf, GPR_SLICE_START_PTR(s->slice), length)) { |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 528 | INTERNAL_STRING_REF(s); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 529 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 530 | GPR_TIMER_END("grpc_mdstr_from_buffer", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 531 | return (grpc_mdstr *)s; |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | /* not found: create a new string */ |
| 536 | if (length + 1 < GPR_SLICE_INLINED_SIZE) { |
| 537 | /* string data goes directly into the slice */ |
| 538 | s = gpr_malloc(sizeof(internal_string)); |
| 539 | s->refs = 1; |
| 540 | s->slice.refcount = NULL; |
| 541 | memcpy(s->slice.data.inlined.bytes, buf, length); |
| 542 | s->slice.data.inlined.bytes[length] = 0; |
Craig Tiller | 6a6b36c | 2015-09-10 16:00:22 -0700 | [diff] [blame] | 543 | s->slice.data.inlined.length = (gpr_uint8)length; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 544 | } else { |
| 545 | /* string data goes after the internal_string header, and we +1 for null |
| 546 | terminator */ |
| 547 | s = gpr_malloc(sizeof(internal_string) + length + 1); |
| 548 | s->refs = 1; |
| 549 | s->refcount.ref = slice_ref; |
| 550 | s->refcount.unref = slice_unref; |
| 551 | s->slice.refcount = &s->refcount; |
| 552 | s->slice.data.refcounted.bytes = (gpr_uint8 *)(s + 1); |
| 553 | s->slice.data.refcounted.length = length; |
| 554 | memcpy(s->slice.data.refcounted.bytes, buf, length); |
| 555 | /* add a null terminator for cheap c string conversion when desired */ |
| 556 | s->slice.data.refcounted.bytes[length] = 0; |
| 557 | } |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 558 | s->has_base64_and_huffman_encoded = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 559 | s->hash = hash; |
| 560 | s->context = ctx; |
| 561 | s->bucket_next = ctx->strtab[hash % ctx->strtab_capacity]; |
| 562 | ctx->strtab[hash % ctx->strtab_capacity] = s; |
| 563 | |
| 564 | ctx->strtab_count++; |
| 565 | |
| 566 | if (ctx->strtab_count > ctx->strtab_capacity * 2) { |
| 567 | grow_strtab(ctx); |
| 568 | } |
| 569 | |
| 570 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 571 | GPR_TIMER_END("grpc_mdstr_from_buffer", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 572 | |
| 573 | return (grpc_mdstr *)s; |
| 574 | } |
| 575 | |
| 576 | static void gc_mdtab(grpc_mdctx *ctx) { |
| 577 | size_t i; |
| 578 | internal_metadata **prev_next; |
| 579 | internal_metadata *md, *next; |
| 580 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 581 | GPR_TIMER_BEGIN("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 582 | for (i = 0; i < ctx->mdtab_capacity; i++) { |
| 583 | prev_next = &ctx->mdtab[i]; |
| 584 | for (md = ctx->mdtab[i]; md; md = next) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 585 | void *user_data = (void *)gpr_atm_no_barrier_load(&md->user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 586 | next = md->bucket_next; |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 587 | if (gpr_atm_acq_load(&md->refcnt) == 0) { |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 588 | INTERNAL_STRING_UNREF(md->key); |
| 589 | INTERNAL_STRING_UNREF(md->value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 590 | if (md->user_data) { |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 591 | ((destroy_user_data_func)gpr_atm_no_barrier_load( |
| 592 | &md->destroy_user_data))(user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 593 | } |
| 594 | gpr_free(md); |
| 595 | *prev_next = next; |
| 596 | ctx->mdtab_free--; |
| 597 | ctx->mdtab_count--; |
| 598 | } else { |
| 599 | prev_next = &md->bucket_next; |
| 600 | } |
| 601 | } |
| 602 | } |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 603 | GPR_TIMER_END("gc_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | static void grow_mdtab(grpc_mdctx *ctx) { |
| 607 | size_t capacity = ctx->mdtab_capacity * 2; |
| 608 | size_t i; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 609 | internal_metadata **mdtab; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 610 | internal_metadata *md, *next; |
| 611 | gpr_uint32 hash; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 612 | |
| 613 | GPR_TIMER_BEGIN("grow_mdtab", 0); |
| 614 | |
| 615 | mdtab = gpr_malloc(sizeof(internal_metadata *) * capacity); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 616 | memset(mdtab, 0, sizeof(internal_metadata *) * capacity); |
| 617 | |
| 618 | for (i = 0; i < ctx->mdtab_capacity; i++) { |
| 619 | for (md = ctx->mdtab[i]; md; md = next) { |
ctiller | fb93d19 | 2014-12-15 10:40:05 -0800 | [diff] [blame] | 620 | hash = GRPC_MDSTR_KV_HASH(md->key->hash, md->value->hash); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 621 | next = md->bucket_next; |
| 622 | md->bucket_next = mdtab[hash % capacity]; |
| 623 | mdtab[hash % capacity] = md; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | gpr_free(ctx->mdtab); |
| 628 | ctx->mdtab = mdtab; |
| 629 | ctx->mdtab_capacity = capacity; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 630 | |
| 631 | GPR_TIMER_END("grow_mdtab", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | static void rehash_mdtab(grpc_mdctx *ctx) { |
| 635 | if (ctx->mdtab_free > ctx->mdtab_capacity / 4) { |
| 636 | gc_mdtab(ctx); |
| 637 | } else { |
| 638 | grow_mdtab(ctx); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | grpc_mdelem *grpc_mdelem_from_metadata_strings(grpc_mdctx *ctx, |
| 643 | grpc_mdstr *mkey, |
| 644 | grpc_mdstr *mvalue) { |
| 645 | internal_string *key = (internal_string *)mkey; |
| 646 | internal_string *value = (internal_string *)mvalue; |
ctiller | fb93d19 | 2014-12-15 10:40:05 -0800 | [diff] [blame] | 647 | gpr_uint32 hash = GRPC_MDSTR_KV_HASH(mkey->hash, mvalue->hash); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 648 | internal_metadata *md; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 649 | size_t i; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 650 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 651 | GPR_ASSERT(is_mdstr_static(mkey) || key->context == ctx); |
| 652 | GPR_ASSERT(is_mdstr_static(mvalue) || value->context == ctx); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 653 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 654 | GPR_TIMER_BEGIN("grpc_mdelem_from_metadata_strings", 0); |
| 655 | |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 656 | if (is_mdstr_static(mkey) && is_mdstr_static(mvalue)) { |
| 657 | for (i = 0; i <= ctx->static_mdtab_maxprobe; i++) { |
| 658 | size_t idx = (hash + i) % GPR_ARRAY_SIZE(ctx->static_mdtab); |
| 659 | static_mdelem *smd = &ctx->static_mdtab[idx]; |
Craig Tiller | b774be4 | 2015-11-19 07:56:13 -0800 | [diff] [blame] | 660 | if (smd->hash == hash && smd->mdelem->key == mkey && |
| 661 | smd->mdelem->value == mvalue) { |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 662 | return smd->mdelem; |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 667 | lock(ctx); |
| 668 | |
| 669 | /* search for an existing pair */ |
| 670 | for (md = ctx->mdtab[hash % ctx->mdtab_capacity]; md; md = md->bucket_next) { |
| 671 | if (md->key == key && md->value == value) { |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 672 | REF_MD_LOCKED(md); |
| 673 | INTERNAL_STRING_UNREF(key); |
| 674 | INTERNAL_STRING_UNREF(value); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 675 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 676 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 677 | return (grpc_mdelem *)md; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /* not found: create a new pair */ |
| 682 | md = gpr_malloc(sizeof(internal_metadata)); |
Craig Tiller | 63bda56 | 2015-10-09 17:40:19 -0700 | [diff] [blame] | 683 | gpr_atm_rel_store(&md->refcnt, 2); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 684 | md->context = ctx; |
| 685 | md->key = key; |
| 686 | md->value = value; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 687 | md->user_data = 0; |
| 688 | md->destroy_user_data = 0; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 689 | md->bucket_next = ctx->mdtab[hash % ctx->mdtab_capacity]; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 690 | gpr_mu_init(&md->mu_user_data); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 691 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 692 | gpr_log(GPR_DEBUG, "ELM NEW:%p:%d: '%s' = '%s'", md, |
| 693 | gpr_atm_no_barrier_load(&md->refcnt), |
| 694 | grpc_mdstr_as_c_string((grpc_mdstr *)md->key), |
| 695 | grpc_mdstr_as_c_string((grpc_mdstr *)md->value)); |
| 696 | #endif |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 697 | ctx->mdtab[hash % ctx->mdtab_capacity] = md; |
| 698 | ctx->mdtab_count++; |
| 699 | |
| 700 | if (ctx->mdtab_count > ctx->mdtab_capacity * 2) { |
| 701 | rehash_mdtab(ctx); |
| 702 | } |
| 703 | |
| 704 | unlock(ctx); |
| 705 | |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 706 | GPR_TIMER_END("grpc_mdelem_from_metadata_strings", 0); |
| 707 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 708 | return (grpc_mdelem *)md; |
| 709 | } |
| 710 | |
| 711 | grpc_mdelem *grpc_mdelem_from_strings(grpc_mdctx *ctx, const char *key, |
| 712 | const char *value) { |
Craig Tiller | 4dbdd6a | 2015-09-25 15:12:16 -0700 | [diff] [blame] | 713 | return grpc_mdelem_from_metadata_strings(ctx, |
| 714 | grpc_mdstr_from_string(ctx, key), |
| 715 | grpc_mdstr_from_string(ctx, value)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | grpc_mdelem *grpc_mdelem_from_slices(grpc_mdctx *ctx, gpr_slice key, |
| 719 | gpr_slice value) { |
| 720 | return grpc_mdelem_from_metadata_strings(ctx, grpc_mdstr_from_slice(ctx, key), |
| 721 | grpc_mdstr_from_slice(ctx, value)); |
| 722 | } |
| 723 | |
| 724 | grpc_mdelem *grpc_mdelem_from_string_and_buffer(grpc_mdctx *ctx, |
| 725 | const char *key, |
| 726 | const gpr_uint8 *value, |
Craig Tiller | 4dbdd6a | 2015-09-25 15:12:16 -0700 | [diff] [blame] | 727 | size_t value_length) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 728 | return grpc_mdelem_from_metadata_strings( |
Craig Tiller | 4dbdd6a | 2015-09-25 15:12:16 -0700 | [diff] [blame] | 729 | ctx, grpc_mdstr_from_string(ctx, key), |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 730 | grpc_mdstr_from_buffer(ctx, value, value_length)); |
| 731 | } |
| 732 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 733 | grpc_mdelem *grpc_mdelem_ref(grpc_mdelem *gmd DEBUG_ARGS) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 734 | internal_metadata *md = (internal_metadata *)gmd; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 735 | if (is_mdelem_static(gmd)) return gmd; |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 736 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 737 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 738 | "ELM REF:%p:%d->%d: '%s' = '%s'", md, |
| 739 | gpr_atm_no_barrier_load(&md->refcnt), |
| 740 | gpr_atm_no_barrier_load(&md->refcnt) + 1, |
| 741 | grpc_mdstr_as_c_string((grpc_mdstr *)md->key), |
| 742 | grpc_mdstr_as_c_string((grpc_mdstr *)md->value)); |
| 743 | #endif |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 744 | /* we can assume the ref count is >= 1 as the application is calling |
| 745 | this function - meaning that no adjustment to mdtab_free is necessary, |
| 746 | simplifying the logic here to be just an atomic increment */ |
| 747 | /* use C assert to have this removed in opt builds */ |
Craig Tiller | b8e8267 | 2015-10-10 13:52:47 -0700 | [diff] [blame] | 748 | assert(gpr_atm_no_barrier_load(&md->refcnt) >= 2); |
Craig Tiller | 9fa41b9 | 2015-04-10 15:08:03 -0700 | [diff] [blame] | 749 | gpr_atm_no_barrier_fetch_add(&md->refcnt, 1); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 750 | return gmd; |
| 751 | } |
| 752 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 753 | void grpc_mdelem_unref(grpc_mdelem *gmd DEBUG_ARGS) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 754 | internal_metadata *md = (internal_metadata *)gmd; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 755 | if (!md) return; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 756 | if (is_mdelem_static(gmd)) return; |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 757 | #ifdef GRPC_METADATA_REFCOUNT_DEBUG |
| 758 | gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, |
| 759 | "ELM UNREF:%p:%d->%d: '%s' = '%s'", md, |
| 760 | gpr_atm_no_barrier_load(&md->refcnt), |
| 761 | gpr_atm_no_barrier_load(&md->refcnt) - 1, |
| 762 | grpc_mdstr_as_c_string((grpc_mdstr *)md->key), |
| 763 | grpc_mdstr_as_c_string((grpc_mdstr *)md->value)); |
| 764 | #endif |
Craig Tiller | 63bda56 | 2015-10-09 17:40:19 -0700 | [diff] [blame] | 765 | if (2 == gpr_atm_full_fetch_add(&md->refcnt, -1)) { |
| 766 | grpc_mdctx *ctx = md->context; |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 767 | GPR_TIMER_BEGIN("grpc_mdelem_unref.to_zero", 0); |
Craig Tiller | 63bda56 | 2015-10-09 17:40:19 -0700 | [diff] [blame] | 768 | lock(ctx); |
Craig Tiller | b8e8267 | 2015-10-10 13:52:47 -0700 | [diff] [blame] | 769 | if (1 == gpr_atm_no_barrier_load(&md->refcnt)) { |
| 770 | ctx->mdtab_free++; |
| 771 | gpr_atm_no_barrier_store(&md->refcnt, 0); |
| 772 | } |
Craig Tiller | 63bda56 | 2015-10-09 17:40:19 -0700 | [diff] [blame] | 773 | unlock(ctx); |
Craig Tiller | 9d35a1f | 2015-11-02 14:16:12 -0800 | [diff] [blame] | 774 | GPR_TIMER_END("grpc_mdelem_unref.to_zero", 0); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 775 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | const char *grpc_mdstr_as_c_string(grpc_mdstr *s) { |
| 779 | return (const char *)GPR_SLICE_START_PTR(s->slice); |
| 780 | } |
| 781 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 782 | grpc_mdstr *grpc_mdstr_ref(grpc_mdstr *gs DEBUG_ARGS) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 783 | internal_string *s = (internal_string *)gs; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 784 | grpc_mdctx *ctx; |
| 785 | if (is_mdstr_static(gs)) return gs; |
| 786 | ctx = s->context; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 787 | lock(ctx); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 788 | internal_string_ref(s FWD_DEBUG_ARGS); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 789 | unlock(ctx); |
| 790 | return gs; |
| 791 | } |
| 792 | |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 793 | void grpc_mdstr_unref(grpc_mdstr *gs DEBUG_ARGS) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 794 | internal_string *s = (internal_string *)gs; |
Craig Tiller | 0e72ede | 2015-11-19 07:48:53 -0800 | [diff] [blame] | 795 | grpc_mdctx *ctx; |
| 796 | if (is_mdstr_static(gs)) return; |
| 797 | ctx = s->context; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 798 | lock(ctx); |
Craig Tiller | 1a65a23 | 2015-07-06 10:22:32 -0700 | [diff] [blame] | 799 | internal_string_unref(s FWD_DEBUG_ARGS); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 800 | unlock(ctx); |
| 801 | } |
| 802 | |
| 803 | size_t grpc_mdctx_get_mdtab_capacity_test_only(grpc_mdctx *ctx) { |
| 804 | return ctx->mdtab_capacity; |
| 805 | } |
| 806 | |
| 807 | size_t grpc_mdctx_get_mdtab_count_test_only(grpc_mdctx *ctx) { |
| 808 | return ctx->mdtab_count; |
| 809 | } |
| 810 | |
| 811 | size_t grpc_mdctx_get_mdtab_free_test_only(grpc_mdctx *ctx) { |
| 812 | return ctx->mdtab_free; |
| 813 | } |
| 814 | |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 815 | void *grpc_mdelem_get_user_data(grpc_mdelem *md, void (*destroy_func)(void *)) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 816 | internal_metadata *im = (internal_metadata *)md; |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 817 | void *result; |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 818 | if (gpr_atm_acq_load(&im->destroy_user_data) == (gpr_atm)destroy_func) { |
| 819 | return (void *)gpr_atm_no_barrier_load(&im->user_data); |
| 820 | } else { |
| 821 | return NULL; |
| 822 | } |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 823 | return result; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | void grpc_mdelem_set_user_data(grpc_mdelem *md, void (*destroy_func)(void *), |
| 827 | void *user_data) { |
| 828 | internal_metadata *im = (internal_metadata *)md; |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 829 | GPR_ASSERT(!is_mdelem_static(md)); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 830 | GPR_ASSERT((user_data == NULL) == (destroy_func == NULL)); |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 831 | gpr_mu_lock(&im->mu_user_data); |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 832 | if (gpr_atm_no_barrier_load(&im->destroy_user_data)) { |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 833 | /* user data can only be set once */ |
| 834 | gpr_mu_unlock(&im->mu_user_data); |
| 835 | if (destroy_func != NULL) { |
| 836 | destroy_func(user_data); |
| 837 | } |
| 838 | return; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 839 | } |
Craig Tiller | 8344daa | 2015-10-09 18:10:57 -0700 | [diff] [blame] | 840 | gpr_atm_no_barrier_store(&im->user_data, (gpr_atm)user_data); |
| 841 | gpr_atm_rel_store(&im->destroy_user_data, (gpr_atm)destroy_func); |
Craig Tiller | 8390153 | 2015-07-10 14:02:45 -0700 | [diff] [blame] | 842 | gpr_mu_unlock(&im->mu_user_data); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 843 | } |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 844 | |
| 845 | gpr_slice grpc_mdstr_as_base64_encoded_and_huffman_compressed(grpc_mdstr *gs) { |
| 846 | internal_string *s = (internal_string *)gs; |
| 847 | gpr_slice slice; |
| 848 | grpc_mdctx *ctx = s->context; |
| 849 | lock(ctx); |
| 850 | if (!s->has_base64_and_huffman_encoded) { |
| 851 | s->base64_and_huffman = |
| 852 | grpc_chttp2_base64_encode_and_huffman_compress(s->slice); |
ctiller | 33023c4 | 2014-12-12 16:28:33 -0800 | [diff] [blame] | 853 | s->has_base64_and_huffman_encoded = 1; |
ctiller | 430c499 | 2014-12-11 09:15:41 -0800 | [diff] [blame] | 854 | } |
| 855 | slice = s->base64_and_huffman; |
| 856 | unlock(ctx); |
| 857 | return slice; |
Craig Tiller | 190d360 | 2015-02-18 09:23:38 -0800 | [diff] [blame] | 858 | } |
Craig Tiller | fe0104a | 2015-04-14 09:19:12 -0700 | [diff] [blame] | 859 | |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 860 | static int conforms_to(grpc_mdstr *s, const gpr_uint8 *legal_bits) { |
Craig Tiller | b96d001 | 2015-05-06 15:33:23 -0700 | [diff] [blame] | 861 | const gpr_uint8 *p = GPR_SLICE_START_PTR(s->slice); |
| 862 | const gpr_uint8 *e = GPR_SLICE_END_PTR(s->slice); |
| 863 | for (; p != e; p++) { |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 864 | int idx = *p; |
| 865 | int byte = idx / 8; |
| 866 | int bit = idx % 8; |
| 867 | if ((legal_bits[byte] & (1 << bit)) == 0) return 0; |
Craig Tiller | b96d001 | 2015-05-06 15:33:23 -0700 | [diff] [blame] | 868 | } |
| 869 | return 1; |
| 870 | } |
| 871 | |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 872 | int grpc_mdstr_is_legal_header(grpc_mdstr *s) { |
| 873 | static const gpr_uint8 legal_header_bits[256 / 8] = { |
Craig Tiller | 80aa280 | 2015-08-21 08:50:51 -0700 | [diff] [blame] | 874 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0xff, 0x03, 0x00, 0x00, 0x00, |
| 875 | 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 876 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 877 | return conforms_to(s, legal_header_bits); |
| 878 | } |
| 879 | |
| 880 | int grpc_mdstr_is_legal_nonbin_header(grpc_mdstr *s) { |
| 881 | static const gpr_uint8 legal_header_bits[256 / 8] = { |
Craig Tiller | 240b7db | 2015-08-27 15:35:32 -0700 | [diff] [blame] | 882 | 0x00, 0x00, 0x00, 0x00, 0xff, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, |
Craig Tiller | 49772e0 | 2015-08-21 08:08:37 -0700 | [diff] [blame] | 883 | 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 884 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| 885 | return conforms_to(s, legal_header_bits); |
| 886 | } |
| 887 | |
Craig Tiller | ebdef9d | 2015-11-19 17:09:49 -0800 | [diff] [blame^] | 888 | static grpc_mdelem *make_accept_encoding_mdelem_for_compression_algorithms( |
| 889 | grpc_mdctx *mdctx, gpr_uint32 algorithms) { |
| 890 | gpr_strvec sv; |
| 891 | int i; |
| 892 | char *str; |
| 893 | grpc_mdelem *out; |
| 894 | |
| 895 | gpr_strvec_init(&sv); |
| 896 | for (i = 0; algorithms != 0; i++, algorithms >>= 1) { |
| 897 | if (algorithms & 1) { |
| 898 | char *name; |
| 899 | GPR_ASSERT(grpc_compression_algorithm_name((grpc_compression_algorithm)i, |
| 900 | &name)); |
| 901 | if (sv.count) { |
| 902 | gpr_strvec_add(&sv, gpr_strdup(",")); |
| 903 | } |
| 904 | gpr_strvec_add(&sv, gpr_strdup(name)); |
| 905 | } |
| 906 | } |
| 907 | str = gpr_strvec_flatten(&sv, NULL); |
| 908 | out = |
| 909 | grpc_mdelem_from_metadata_strings(mdctx, GRPC_MDSTR_GRPC_ACCEPT_ENCODING, |
| 910 | grpc_mdstr_from_string(mdctx, str)); |
| 911 | gpr_strvec_destroy(&sv); |
| 912 | gpr_free(str); |
| 913 | return out; |
| 914 | } |
| 915 | |
| 916 | grpc_mdelem *grpc_accept_encoding_mdelem_from_compression_algorithms( |
| 917 | grpc_mdctx *ctx, gpr_uint32 algorithms) { |
| 918 | grpc_mdelem *ret; |
| 919 | gpr_atm *slot; |
| 920 | GPR_ASSERT(algorithms < GPR_ARRAY_SIZE(ctx->compression_algorithm_mdelem)); |
| 921 | |
| 922 | slot = &ctx->compression_algorithm_mdelem[algorithms]; |
| 923 | ret = get_cache(slot); |
| 924 | if (ret == NULL) { |
| 925 | set_cache(slot, make_accept_encoding_mdelem_for_compression_algorithms( |
| 926 | ctx, algorithms)); |
| 927 | ret = get_cache(slot); |
| 928 | GPR_ASSERT(ret != NULL); |
| 929 | } |
| 930 | |
| 931 | return ret; |
| 932 | } |
| 933 | |
Craig Tiller | b96d001 | 2015-05-06 15:33:23 -0700 | [diff] [blame] | 934 | int grpc_mdstr_is_bin_suffixed(grpc_mdstr *s) { |
| 935 | /* TODO(ctiller): consider caching this */ |
| 936 | return grpc_is_binary_header((const char *)GPR_SLICE_START_PTR(s->slice), |
| 937 | GPR_SLICE_LENGTH(s->slice)); |
| 938 | } |