Craig Tiller | cd29c58 | 2015-06-24 09:15:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2015, Google Inc. |
| 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/client_config/resolvers/dns_resolver.h" |
| 35 | |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 36 | #include <string.h> |
| 37 | |
| 38 | #include <grpc/support/alloc.h> |
Craig Tiller | 6b9f5c6 | 2015-07-29 18:47:35 -0700 | [diff] [blame] | 39 | #include <grpc/support/host_port.h> |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 40 | #include <grpc/support/string_util.h> |
| 41 | |
David Garcia Quintas | 5c4543d | 2015-09-03 15:49:56 -0700 | [diff] [blame] | 42 | #include "src/core/client_config/lb_policy_registry.h" |
Craig Tiller | 6b9f5c6 | 2015-07-29 18:47:35 -0700 | [diff] [blame] | 43 | #include "src/core/client_config/subchannel_factory_decorators/add_channel_arg.h" |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 44 | #include "src/core/iomgr/resolve_address.h" |
| 45 | #include "src/core/support/string.h" |
| 46 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 47 | typedef struct |
| 48 | { |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 49 | /** base class: must be first */ |
| 50 | grpc_resolver base; |
| 51 | /** refcount */ |
| 52 | gpr_refcount refs; |
| 53 | /** name to resolve */ |
| 54 | char *name; |
| 55 | /** default port to use */ |
| 56 | char *default_port; |
| 57 | /** subchannel factory */ |
| 58 | grpc_subchannel_factory *subchannel_factory; |
David Garcia Quintas | 5c4543d | 2015-09-03 15:49:56 -0700 | [diff] [blame] | 59 | /** load balancing policy name */ |
| 60 | char *lb_policy_name; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 61 | |
| 62 | /** mutex guarding the rest of the state */ |
| 63 | gpr_mu mu; |
| 64 | /** are we currently resolving? */ |
| 65 | int resolving; |
| 66 | /** which version of resolved_config have we published? */ |
| 67 | int published_version; |
| 68 | /** which version of resolved_config is current? */ |
| 69 | int resolved_version; |
| 70 | /** pending next completion, or NULL */ |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 71 | grpc_closure *next_completion; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 72 | /** target config address for next completion */ |
| 73 | grpc_client_config **target_config; |
| 74 | /** current (fully resolved) config */ |
| 75 | grpc_client_config *resolved_config; |
| 76 | } dns_resolver; |
| 77 | |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 78 | static void dns_destroy (grpc_exec_ctx * exec_ctx, grpc_resolver * r); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 79 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 80 | static void dns_start_resolving_locked (dns_resolver * r); |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 81 | static void dns_maybe_finish_next_locked (grpc_exec_ctx * exec_ctx, dns_resolver * r); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 82 | |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 83 | static void dns_shutdown (grpc_exec_ctx * exec_ctx, grpc_resolver * r); |
| 84 | static void dns_channel_saw_error (grpc_exec_ctx * exec_ctx, grpc_resolver * r, struct sockaddr *failing_address, int failing_address_len); |
| 85 | static void dns_next (grpc_exec_ctx * exec_ctx, grpc_resolver * r, grpc_client_config ** target_config, grpc_closure * on_complete); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 86 | |
| 87 | static const grpc_resolver_vtable dns_resolver_vtable = { |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 88 | dns_destroy, dns_shutdown, dns_channel_saw_error, dns_next |
| 89 | }; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 90 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 91 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 92 | dns_shutdown (grpc_exec_ctx * exec_ctx, grpc_resolver * resolver) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 93 | { |
| 94 | dns_resolver *r = (dns_resolver *) resolver; |
| 95 | gpr_mu_lock (&r->mu); |
| 96 | if (r->next_completion != NULL) |
| 97 | { |
| 98 | *r->target_config = NULL; |
| 99 | grpc_closure_list_add (closure_list, r->next_completion, 1); |
| 100 | r->next_completion = NULL; |
| 101 | } |
| 102 | gpr_mu_unlock (&r->mu); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 105 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 106 | dns_channel_saw_error (grpc_exec_ctx * exec_ctx, grpc_resolver * resolver, struct sockaddr *sa, int len) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 107 | { |
| 108 | dns_resolver *r = (dns_resolver *) resolver; |
| 109 | gpr_mu_lock (&r->mu); |
| 110 | if (!r->resolving) |
| 111 | { |
| 112 | dns_start_resolving_locked (r); |
| 113 | } |
| 114 | gpr_mu_unlock (&r->mu); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 115 | } |
| 116 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 117 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 118 | dns_next (grpc_exec_ctx * exec_ctx, grpc_resolver * resolver, grpc_client_config ** target_config, grpc_closure * on_complete) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 119 | { |
| 120 | dns_resolver *r = (dns_resolver *) resolver; |
| 121 | gpr_mu_lock (&r->mu); |
| 122 | GPR_ASSERT (!r->next_completion); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 123 | r->next_completion = on_complete; |
| 124 | r->target_config = target_config; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 125 | if (r->resolved_version == 0 && !r->resolving) |
| 126 | { |
| 127 | dns_start_resolving_locked (r); |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | dns_maybe_finish_next_locked (r, closure_list); |
| 132 | } |
| 133 | gpr_mu_unlock (&r->mu); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 136 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 137 | dns_on_resolved (grpc_exec_ctx * exec_ctx, void *arg, grpc_resolved_addresses * addresses) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 138 | { |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 139 | dns_resolver *r = arg; |
| 140 | grpc_client_config *config = NULL; |
| 141 | grpc_subchannel **subchannels; |
| 142 | grpc_subchannel_args args; |
Craig Tiller | d7b68e7 | 2015-06-28 11:41:09 -0700 | [diff] [blame] | 143 | grpc_lb_policy *lb_policy; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 144 | size_t i; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 145 | if (addresses) |
| 146 | { |
| 147 | grpc_lb_policy_args lb_policy_args; |
| 148 | config = grpc_client_config_create (); |
| 149 | subchannels = gpr_malloc (sizeof (grpc_subchannel *) * addresses->naddrs); |
| 150 | for (i = 0; i < addresses->naddrs; i++) |
| 151 | { |
| 152 | memset (&args, 0, sizeof (args)); |
| 153 | args.addr = (struct sockaddr *) (addresses->addrs[i].addr); |
| 154 | args.addr_len = (size_t) addresses->addrs[i].len; |
| 155 | subchannels[i] = grpc_subchannel_factory_create_subchannel (r->subchannel_factory, &args, closure_list); |
| 156 | } |
| 157 | memset (&lb_policy_args, 0, sizeof (lb_policy_args)); |
| 158 | lb_policy_args.subchannels = subchannels; |
| 159 | lb_policy_args.num_subchannels = addresses->naddrs; |
| 160 | lb_policy = grpc_lb_policy_create (r->lb_policy_name, &lb_policy_args); |
| 161 | grpc_client_config_set_lb_policy (config, lb_policy); |
| 162 | GRPC_LB_POLICY_UNREF (lb_policy, "construction", closure_list); |
| 163 | grpc_resolved_addresses_destroy (addresses); |
| 164 | gpr_free (subchannels); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 165 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 166 | gpr_mu_lock (&r->mu); |
| 167 | GPR_ASSERT (r->resolving); |
Craig Tiller | 9846503 | 2015-06-29 14:36:42 -0700 | [diff] [blame] | 168 | r->resolving = 0; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 169 | if (r->resolved_config) |
| 170 | { |
| 171 | grpc_client_config_unref (r->resolved_config, closure_list); |
| 172 | } |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 173 | r->resolved_config = config; |
| 174 | r->resolved_version++; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 175 | dns_maybe_finish_next_locked (r, closure_list); |
| 176 | gpr_mu_unlock (&r->mu); |
Craig Tiller | d7b68e7 | 2015-06-28 11:41:09 -0700 | [diff] [blame] | 177 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 178 | GRPC_RESOLVER_UNREF (&r->base, "dns-resolving", closure_list); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 181 | static void |
| 182 | dns_start_resolving_locked (dns_resolver * r) |
| 183 | { |
| 184 | GRPC_RESOLVER_REF (&r->base, "dns-resolving"); |
| 185 | GPR_ASSERT (!r->resolving); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 186 | r->resolving = 1; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 187 | grpc_resolve_address (r->name, r->default_port, dns_on_resolved, r); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 190 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 191 | dns_maybe_finish_next_locked (grpc_exec_ctx * exec_ctx, dns_resolver * r) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 192 | { |
| 193 | if (r->next_completion != NULL && r->resolved_version != r->published_version) |
| 194 | { |
| 195 | *r->target_config = r->resolved_config; |
| 196 | if (r->resolved_config) |
| 197 | { |
| 198 | grpc_client_config_ref (r->resolved_config); |
| 199 | } |
| 200 | grpc_closure_list_add (closure_list, r->next_completion, 1); |
| 201 | r->next_completion = NULL; |
| 202 | r->published_version = r->resolved_version; |
Craig Tiller | abf3638 | 2015-06-29 16:13:27 -0700 | [diff] [blame] | 203 | } |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 206 | static void |
Craig Tiller | 1be70cc | 2015-09-22 10:45:28 -0700 | [diff] [blame^] | 207 | dns_destroy (grpc_exec_ctx * exec_ctx, grpc_resolver * gr) |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 208 | { |
| 209 | dns_resolver *r = (dns_resolver *) gr; |
| 210 | gpr_mu_destroy (&r->mu); |
| 211 | if (r->resolved_config) |
| 212 | { |
| 213 | grpc_client_config_unref (r->resolved_config, closure_list); |
| 214 | } |
| 215 | grpc_subchannel_factory_unref (r->subchannel_factory, closure_list); |
| 216 | gpr_free (r->name); |
| 217 | gpr_free (r->default_port); |
| 218 | gpr_free (r->lb_policy_name); |
| 219 | gpr_free (r); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 222 | static grpc_resolver * |
| 223 | dns_create (grpc_resolver_args * args, const char *default_port, const char *lb_policy_name) |
| 224 | { |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 225 | dns_resolver *r; |
Craig Tiller | 06a43f5 | 2015-09-15 07:41:28 -0700 | [diff] [blame] | 226 | const char *path = args->uri->path; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 227 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 228 | if (0 != strcmp (args->uri->authority, "")) |
| 229 | { |
| 230 | gpr_log (GPR_ERROR, "authority based dns uri's not supported"); |
| 231 | return NULL; |
| 232 | } |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 233 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 234 | if (path[0] == '/') |
| 235 | ++path; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 236 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 237 | r = gpr_malloc (sizeof (dns_resolver)); |
| 238 | memset (r, 0, sizeof (*r)); |
| 239 | gpr_ref_init (&r->refs, 1); |
| 240 | gpr_mu_init (&r->mu); |
| 241 | grpc_resolver_init (&r->base, &dns_resolver_vtable); |
| 242 | r->name = gpr_strdup (path); |
| 243 | r->default_port = gpr_strdup (default_port); |
Craig Tiller | 06a43f5 | 2015-09-15 07:41:28 -0700 | [diff] [blame] | 244 | r->subchannel_factory = args->subchannel_factory; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 245 | grpc_subchannel_factory_ref (r->subchannel_factory); |
| 246 | r->lb_policy_name = gpr_strdup (lb_policy_name); |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 247 | return &r->base; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * FACTORY |
| 252 | */ |
| 253 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 254 | static void |
| 255 | dns_factory_ref (grpc_resolver_factory * factory) |
| 256 | { |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 257 | } |
| 258 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 259 | static void |
| 260 | dns_factory_unref (grpc_resolver_factory * factory) |
| 261 | { |
| 262 | } |
| 263 | |
| 264 | static grpc_resolver * |
| 265 | dns_factory_create_resolver (grpc_resolver_factory * factory, grpc_resolver_args * args) |
| 266 | { |
| 267 | return dns_create (args, "https", "pick_first"); |
| 268 | } |
| 269 | |
| 270 | char * |
| 271 | dns_factory_get_default_host_name (grpc_resolver_factory * factory, grpc_uri * uri) |
| 272 | { |
Craig Tiller | bc85be1 | 2015-08-24 10:36:39 -0700 | [diff] [blame] | 273 | const char *path = uri->path; |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 274 | if (path[0] == '/') |
| 275 | ++path; |
| 276 | return gpr_strdup (path); |
Craig Tiller | bc85be1 | 2015-08-24 10:36:39 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 279 | static const grpc_resolver_factory_vtable dns_factory_vtable = { |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 280 | dns_factory_ref, dns_factory_unref, dns_factory_create_resolver, |
| 281 | dns_factory_get_default_host_name, "dns" |
| 282 | }; |
| 283 | static grpc_resolver_factory dns_resolver_factory = { &dns_factory_vtable }; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 284 | |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 285 | grpc_resolver_factory * |
| 286 | grpc_dns_resolver_factory_create () |
| 287 | { |
Craig Tiller | eb3b12e | 2015-06-26 14:42:49 -0700 | [diff] [blame] | 288 | return &dns_resolver_factory; |
Craig Tiller | 3bc8ebd | 2015-06-24 15:41:15 -0700 | [diff] [blame] | 289 | } |