David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2016, 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 | |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 34 | /** Implementation of the gRPC LB policy. |
| 35 | * |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 36 | * This policy takes as input a set of resolved addresses {a1..an} for which the |
| 37 | * LB set was set (it's the resolver's responsibility to ensure this). That is |
| 38 | * to say, {a1..an} represent a collection of LB servers. |
| 39 | * |
| 40 | * An internal channel (\a glb_lb_policy.lb_channel) is created over {a1..an}. |
| 41 | * This channel behaves just like a regular channel. In particular, the |
| 42 | * constructed URI over the addresses a1..an will use the default pick first |
| 43 | * policy to select from this list of LB server backends. |
| 44 | * |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 45 | * The first time the policy gets a request for a pick, a ping, or to exit the |
| 46 | * idle state, \a query_for_backends() is called. It creates an instance of \a |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 47 | * lb_client_data, an internal struct meant to contain the data associated with |
| 48 | * the internal communication with the LB server. This instance is created via |
| 49 | * \a lb_client_data_create(). There, the call over lb_channel to pick-first |
| 50 | * from {a1..an} is created, the \a LoadBalancingRequest message is assembled |
| 51 | * and all necessary callbacks for the progress of the internal call configured. |
| 52 | * |
| 53 | * Back in \a query_for_backends(), the internal *streaming* call to the LB |
| 54 | * server (whichever address from {a1..an} pick-first chose) is kicked off. |
| 55 | * It'll progress over the callbacks configured in \a lb_client_data_create() |
| 56 | * (see the field docstrings of \a lb_client_data for more details). |
| 57 | * |
| 58 | * If the call fails with UNIMPLEMENTED, the original call will also fail. |
| 59 | * There's a misconfiguration somewhere: at least one of {a1..an} isn't a LB |
| 60 | * server, which contradicts the LB bit being set. If the internal call times |
| 61 | * out, the usual behavior of pick-first applies, continuing to pick from the |
| 62 | * list {a1..an}. |
| 63 | * |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 64 | * Upon sucesss, a \a LoadBalancingResponse is expected in \a res_recv_cb. An |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 65 | * invalid one results in the termination of the streaming call. A new streaming |
| 66 | * call should be created if possible, failing the original call otherwise. |
| 67 | * For a valid \a LoadBalancingResponse, the server list of actual backends is |
| 68 | * extracted. A Round Robin policy will be created from this list. There are two |
| 69 | * possible scenarios: |
| 70 | * |
| 71 | * 1. This is the first server list received. There was no previous instance of |
| 72 | * the Round Robin policy. \a rr_handover() will instantiate the RR policy |
| 73 | * and perform all the pending operations over it. |
| 74 | * 2. There's already a RR policy instance active. We need to introduce the new |
| 75 | * one build from the new serverlist, but taking care not to disrupt the |
| 76 | * operations in progress over the old RR instance. This is done by |
| 77 | * decreasing the reference count on the old policy. The moment no more |
| 78 | * references are held on the old RR policy, it'll be destroyed and \a |
| 79 | * rr_connectivity_changed notified with a \a GRPC_CHANNEL_SHUTDOWN state. |
| 80 | * At this point we can transition to a new RR instance safely, which is done |
| 81 | * once again via \a rr_handover(). |
| 82 | * |
| 83 | * |
| 84 | * Once a RR policy instance is in place (and getting updated as described), |
| 85 | * calls to for a pick, a ping or a cancellation will be serviced right away by |
| 86 | * forwarding them to the RR instance. Any time there's no RR policy available |
David Garcia Quintas | d4a756b | 2016-07-19 11:35:15 -0700 | [diff] [blame] | 87 | * (ie, right after the creation of the gRPCLB policy, if an empty serverlist |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 88 | * is received, etc), pick/ping requests are added to a list of pending |
| 89 | * picks/pings to be flushed and serviced as part of \a rr_handover() the moment |
| 90 | * the RR policy instance becomes available. |
| 91 | * |
| 92 | * \see https://github.com/grpc/grpc/blob/master/doc/load-balancing.md for the |
| 93 | * high level design and details. */ |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 94 | |
| 95 | /* TODO(dgq): |
| 96 | * - Implement LB service forwarding (point 2c. in the doc's diagram). |
| 97 | */ |
| 98 | |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 99 | #include <string.h> |
| 100 | |
| 101 | #include <grpc/byte_buffer_reader.h> |
| 102 | #include <grpc/grpc.h> |
| 103 | #include <grpc/support/alloc.h> |
| 104 | #include <grpc/support/host_port.h> |
| 105 | #include <grpc/support/string_util.h> |
| 106 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 107 | #include "src/core/ext/client_config/client_channel_factory.h" |
| 108 | #include "src/core/ext/client_config/lb_policy_registry.h" |
| 109 | #include "src/core/ext/client_config/parse_address.h" |
David Garcia Quintas | 8782d1b | 2016-06-15 23:58:44 -0700 | [diff] [blame] | 110 | #include "src/core/ext/lb_policy/grpclb/grpclb.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 111 | #include "src/core/ext/lb_policy/grpclb/load_balancer_api.h" |
| 112 | #include "src/core/lib/iomgr/sockaddr_utils.h" |
| 113 | #include "src/core/lib/support/string.h" |
| 114 | #include "src/core/lib/surface/call.h" |
| 115 | #include "src/core/lib/surface/channel.h" |
| 116 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 117 | int grpc_lb_glb_trace = 0; |
| 118 | |
| 119 | typedef struct wrapped_rr_closure_arg { |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 120 | /* the original closure. Usually a on_complete/notify cb for pick() and ping() |
| 121 | * calls against the internal RR instance, respectively. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 122 | grpc_closure *wrapped_closure; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 123 | |
| 124 | /* The RR instance related to the closure */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 125 | grpc_lb_policy *rr_policy; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 126 | |
| 127 | /* when not NULL, represents a pending_{pick,ping} node to be freed upon |
| 128 | * closure execution */ |
| 129 | void *owning_pending_node; /* to be freed if not NULL */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 130 | } wrapped_rr_closure_arg; |
| 131 | |
| 132 | /* The \a on_complete closure passed as part of the pick requires keeping a |
| 133 | * reference to its associated round robin instance. We wrap this closure in |
| 134 | * order to unref the round robin instance upon its invocation */ |
| 135 | static void wrapped_rr_closure(grpc_exec_ctx *exec_ctx, void *arg, |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 136 | grpc_error *error) { |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 137 | wrapped_rr_closure_arg *wc_arg = arg; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 138 | if (wc_arg->rr_policy != NULL) { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 139 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 140 | gpr_log(GPR_INFO, "Unreffing RR (0x%" PRIxPTR ")", |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 141 | (intptr_t)wc_arg->rr_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 142 | } |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 143 | GRPC_LB_POLICY_UNREF(exec_ctx, wc_arg->rr_policy, "wrapped_rr_closure"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 144 | } |
David Garcia Quintas | 5a87616 | 2016-07-18 13:08:42 -0700 | [diff] [blame] | 145 | GPR_ASSERT(wc_arg->wrapped_closure != NULL); |
| 146 | grpc_exec_ctx_sched(exec_ctx, wc_arg->wrapped_closure, error, NULL); |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 147 | gpr_free(wc_arg->owning_pending_node); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 148 | } |
| 149 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 150 | /* Linked list of pending pick requests. It stores all information needed to |
| 151 | * eventually call (Round Robin's) pick() on them. They mainly stay pending |
| 152 | * waiting for the RR policy to be created/updated. |
| 153 | * |
| 154 | * One particularity is the wrapping of the user-provided \a on_complete closure |
| 155 | * (in \a wrapped_on_complete and \a wrapped_on_complete_arg). This is needed in |
| 156 | * order to correctly unref the RR policy instance upon completion of the pick. |
| 157 | * See \a wrapped_rr_closure for details. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 158 | typedef struct pending_pick { |
| 159 | struct pending_pick *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 160 | |
| 161 | /* polling entity for the pick()'s async notification */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 162 | grpc_polling_entity *pollent; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 163 | |
| 164 | /* the initial metadata for the pick. See grpc_lb_policy_pick() */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 165 | grpc_metadata_batch *initial_metadata; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 166 | |
| 167 | /* bitmask passed to pick() and used for selective cancelling. See |
| 168 | * grpc_lb_policy_cancel_picks() */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 169 | uint32_t initial_metadata_flags; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 170 | |
| 171 | /* output argument where to store the pick()ed connected subchannel, or NULL |
| 172 | * upon error. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 173 | grpc_connected_subchannel **target; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 174 | |
| 175 | /* a closure wrapping the original on_complete one to be invoked once the |
| 176 | * pick() has completed (regardless of success) */ |
| 177 | grpc_closure wrapped_on_complete; |
| 178 | |
| 179 | /* args for wrapped_on_complete */ |
| 180 | wrapped_rr_closure_arg wrapped_on_complete_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 181 | } pending_pick; |
| 182 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 183 | static void add_pending_pick(pending_pick **root, grpc_polling_entity *pollent, |
| 184 | grpc_metadata_batch *initial_metadata, |
| 185 | uint32_t initial_metadata_flags, |
| 186 | grpc_connected_subchannel **target, |
| 187 | grpc_closure *on_complete) { |
| 188 | pending_pick *pp = gpr_malloc(sizeof(*pp)); |
| 189 | memset(pp, 0, sizeof(pending_pick)); |
| 190 | memset(&pp->wrapped_on_complete_arg, 0, sizeof(wrapped_rr_closure_arg)); |
| 191 | pp->next = *root; |
| 192 | pp->pollent = pollent; |
| 193 | pp->target = target; |
| 194 | pp->initial_metadata = initial_metadata; |
| 195 | pp->initial_metadata_flags = initial_metadata_flags; |
| 196 | pp->wrapped_on_complete_arg.wrapped_closure = on_complete; |
| 197 | grpc_closure_init(&pp->wrapped_on_complete, wrapped_rr_closure, |
| 198 | &pp->wrapped_on_complete_arg); |
| 199 | *root = pp; |
| 200 | } |
| 201 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 202 | /* Same as the \a pending_pick struct but for ping operations */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 203 | typedef struct pending_ping { |
| 204 | struct pending_ping *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 205 | |
| 206 | /* a closure wrapping the original on_complete one to be invoked once the |
| 207 | * ping() has completed (regardless of success) */ |
| 208 | grpc_closure wrapped_notify; |
| 209 | |
| 210 | /* args for wrapped_notify */ |
| 211 | wrapped_rr_closure_arg wrapped_notify_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 212 | } pending_ping; |
| 213 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 214 | static void add_pending_ping(pending_ping **root, grpc_closure *notify) { |
| 215 | pending_ping *pping = gpr_malloc(sizeof(*pping)); |
| 216 | memset(pping, 0, sizeof(pending_ping)); |
| 217 | memset(&pping->wrapped_notify_arg, 0, sizeof(wrapped_rr_closure_arg)); |
| 218 | pping->next = *root; |
| 219 | grpc_closure_init(&pping->wrapped_notify, wrapped_rr_closure, |
| 220 | &pping->wrapped_notify_arg); |
| 221 | pping->wrapped_notify_arg.wrapped_closure = notify; |
| 222 | *root = pping; |
| 223 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 224 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 225 | |
| 226 | /* |
| 227 | * glb_lb_policy |
| 228 | */ |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 229 | typedef struct rr_connectivity_data rr_connectivity_data; |
| 230 | typedef struct lb_client_data lb_client_data; |
| 231 | static const grpc_lb_policy_vtable glb_lb_policy_vtable; |
| 232 | typedef struct glb_lb_policy { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 233 | /** base policy: must be first */ |
| 234 | grpc_lb_policy base; |
| 235 | |
| 236 | /** mutex protecting remaining members */ |
| 237 | gpr_mu mu; |
| 238 | |
| 239 | grpc_client_channel_factory *cc_factory; |
| 240 | |
| 241 | /** for communicating with the LB server */ |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 242 | grpc_channel *lb_channel; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 243 | |
| 244 | /** the RR policy to use of the backend servers returned by the LB server */ |
| 245 | grpc_lb_policy *rr_policy; |
| 246 | |
| 247 | bool started_picking; |
| 248 | |
| 249 | /** our connectivity state tracker */ |
| 250 | grpc_connectivity_state_tracker state_tracker; |
| 251 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 252 | /** stores the deserialized response from the LB. May be NULL until one such |
| 253 | * response has arrived. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 254 | grpc_grpclb_serverlist *serverlist; |
| 255 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 256 | /** list of picks that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 257 | pending_pick *pending_picks; |
| 258 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 259 | /** list of pings that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 260 | pending_ping *pending_pings; |
| 261 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 262 | /** client data associated with the LB server communication */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 263 | lb_client_data *lb_client; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 264 | |
| 265 | /** for tracking of the RR connectivity */ |
| 266 | rr_connectivity_data *rr_connectivity; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 267 | |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 268 | /* a wrapped (see \a wrapped_rr_closure) on-complete closure for readily |
| 269 | * available RR picks */ |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 270 | grpc_closure wrapped_on_complete; |
| 271 | |
| 272 | /* arguments for the wrapped_on_complete closure */ |
| 273 | wrapped_rr_closure_arg wc_arg; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 274 | } glb_lb_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 275 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 276 | /* Keeps track and reacts to changes in connectivity of the RR instance */ |
| 277 | struct rr_connectivity_data { |
| 278 | grpc_closure on_change; |
| 279 | grpc_connectivity_state state; |
| 280 | glb_lb_policy *glb_policy; |
| 281 | }; |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 282 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 283 | static grpc_lb_policy *create_rr(grpc_exec_ctx *exec_ctx, |
| 284 | const grpc_grpclb_serverlist *serverlist, |
| 285 | glb_lb_policy *glb_policy) { |
| 286 | /* TODO(dgq): support mixed ip version */ |
| 287 | GPR_ASSERT(serverlist != NULL && serverlist->num_servers > 0); |
| 288 | char **host_ports = gpr_malloc(sizeof(char *) * serverlist->num_servers); |
| 289 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
| 290 | gpr_join_host_port(&host_ports[i], serverlist->servers[i]->ip_address, |
| 291 | serverlist->servers[i]->port); |
| 292 | } |
| 293 | |
| 294 | size_t uri_path_len; |
| 295 | char *concat_ipports = gpr_strjoin_sep( |
| 296 | (const char **)host_ports, serverlist->num_servers, ",", &uri_path_len); |
| 297 | |
| 298 | grpc_lb_policy_args args; |
| 299 | args.client_channel_factory = glb_policy->cc_factory; |
| 300 | args.addresses = gpr_malloc(sizeof(grpc_resolved_addresses)); |
| 301 | args.addresses->naddrs = serverlist->num_servers; |
| 302 | args.addresses->addrs = |
| 303 | gpr_malloc(sizeof(grpc_resolved_address) * args.addresses->naddrs); |
| 304 | size_t out_addrs_idx = 0; |
| 305 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
| 306 | grpc_uri uri; |
| 307 | struct sockaddr_storage sa; |
| 308 | size_t sa_len; |
| 309 | uri.path = host_ports[i]; |
| 310 | if (parse_ipv4(&uri, &sa, &sa_len)) { /* TODO(dgq): add support for ipv6 */ |
| 311 | memcpy(args.addresses->addrs[out_addrs_idx].addr, &sa, sa_len); |
| 312 | args.addresses->addrs[out_addrs_idx].len = sa_len; |
| 313 | ++out_addrs_idx; |
| 314 | } else { |
| 315 | gpr_log(GPR_ERROR, "Invalid LB service address '%s', ignoring.", |
| 316 | host_ports[i]); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | grpc_lb_policy *rr = grpc_lb_policy_create(exec_ctx, "round_robin", &args); |
| 321 | |
| 322 | gpr_free(concat_ipports); |
| 323 | for (size_t i = 0; i < serverlist->num_servers; i++) { |
| 324 | gpr_free(host_ports[i]); |
| 325 | } |
| 326 | gpr_free(host_ports); |
| 327 | gpr_free(args.addresses->addrs); |
| 328 | gpr_free(args.addresses); |
| 329 | return rr; |
| 330 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 331 | |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 332 | static void rr_handover(grpc_exec_ctx *exec_ctx, glb_lb_policy *glb_policy, |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 333 | grpc_error *error) { |
| 334 | GRPC_ERROR_REF(error); |
| 335 | glb_policy->rr_policy = |
| 336 | create_rr(exec_ctx, glb_policy->serverlist, glb_policy); |
| 337 | |
| 338 | if (grpc_lb_glb_trace) { |
| 339 | gpr_log(GPR_INFO, "Created RR policy (0x%" PRIxPTR ")", |
| 340 | (intptr_t)glb_policy->rr_policy); |
| 341 | } |
| 342 | GPR_ASSERT(glb_policy->rr_policy != NULL); |
| 343 | glb_policy->rr_connectivity->state = grpc_lb_policy_check_connectivity( |
| 344 | exec_ctx, glb_policy->rr_policy, &error); |
| 345 | grpc_lb_policy_notify_on_state_change( |
| 346 | exec_ctx, glb_policy->rr_policy, &glb_policy->rr_connectivity->state, |
| 347 | &glb_policy->rr_connectivity->on_change); |
| 348 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
| 349 | glb_policy->rr_connectivity->state, error, |
| 350 | "rr_handover"); |
| 351 | grpc_lb_policy_exit_idle(exec_ctx, glb_policy->rr_policy); |
| 352 | |
| 353 | /* flush pending ops */ |
| 354 | pending_pick *pp; |
| 355 | while ((pp = glb_policy->pending_picks)) { |
| 356 | glb_policy->pending_picks = pp->next; |
| 357 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_pick"); |
| 358 | pp->wrapped_on_complete_arg.rr_policy = glb_policy->rr_policy; |
| 359 | if (grpc_lb_glb_trace) { |
| 360 | gpr_log(GPR_INFO, "Pending pick about to PICK from 0x%" PRIxPTR "", |
| 361 | (intptr_t)glb_policy->rr_policy); |
| 362 | } |
| 363 | grpc_lb_policy_pick(exec_ctx, glb_policy->rr_policy, pp->pollent, |
| 364 | pp->initial_metadata, pp->initial_metadata_flags, |
| 365 | pp->target, &pp->wrapped_on_complete); |
| 366 | pp->wrapped_on_complete_arg.owning_pending_node = pp; |
| 367 | } |
| 368 | |
| 369 | pending_ping *pping; |
| 370 | while ((pping = glb_policy->pending_pings)) { |
| 371 | glb_policy->pending_pings = pping->next; |
| 372 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_ping"); |
| 373 | pping->wrapped_notify_arg.rr_policy = glb_policy->rr_policy; |
| 374 | if (grpc_lb_glb_trace) { |
| 375 | gpr_log(GPR_INFO, "Pending ping about to PING from 0x%" PRIxPTR "", |
| 376 | (intptr_t)glb_policy->rr_policy); |
| 377 | } |
| 378 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, |
| 379 | &pping->wrapped_notify); |
| 380 | pping->wrapped_notify_arg.owning_pending_node = pping; |
| 381 | } |
| 382 | GRPC_ERROR_UNREF(error); |
| 383 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 384 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 385 | static void rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg, |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 386 | grpc_error *error) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 387 | rr_connectivity_data *rr_conn_data = arg; |
| 388 | glb_lb_policy *glb_policy = rr_conn_data->glb_policy; |
| 389 | if (rr_conn_data->state == GRPC_CHANNEL_SHUTDOWN) { |
| 390 | if (glb_policy->serverlist != NULL) { |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 391 | /* a RR policy is shutting down but there's a serverlist available -> |
| 392 | * perform a handover */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 393 | rr_handover(exec_ctx, glb_policy, error); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 394 | } else { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 395 | /* shutting down and no new serverlist available. Bail out. */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 396 | gpr_free(rr_conn_data); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 397 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 398 | } else { |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 399 | if (error == GRPC_ERROR_NONE) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 400 | /* RR not shutting down. Mimic the RR's policy state */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 401 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
| 402 | rr_conn_data->state, error, |
| 403 | "rr_connectivity_changed"); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 404 | /* resubscribe */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 405 | grpc_lb_policy_notify_on_state_change(exec_ctx, glb_policy->rr_policy, |
| 406 | &rr_conn_data->state, |
| 407 | &rr_conn_data->on_change); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 408 | } else { /* error */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 409 | gpr_free(rr_conn_data); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 410 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 411 | } |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 412 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 413 | } |
| 414 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 415 | static grpc_lb_policy *glb_create(grpc_exec_ctx *exec_ctx, |
| 416 | grpc_lb_policy_factory *factory, |
| 417 | grpc_lb_policy_args *args) { |
| 418 | glb_lb_policy *glb_policy = gpr_malloc(sizeof(*glb_policy)); |
| 419 | memset(glb_policy, 0, sizeof(*glb_policy)); |
| 420 | |
| 421 | /* All input addresses in args->addresses come from a resolver that claims |
| 422 | * they are LB services. It's the resolver's responsibility to make sure this |
| 423 | * policy is only instantiated and used in that case. |
| 424 | * |
| 425 | * Create a client channel over them to communicate with a LB service */ |
| 426 | glb_policy->cc_factory = args->client_channel_factory; |
| 427 | GPR_ASSERT(glb_policy->cc_factory != NULL); |
| 428 | if (args->addresses->naddrs == 0) { |
| 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | /* construct a target from the args->addresses, in the form |
| 433 | * ipvX://ip1:port1,ip2:port2,... |
| 434 | * TODO(dgq): support mixed ip version */ |
| 435 | char **addr_strs = gpr_malloc(sizeof(char *) * args->addresses->naddrs); |
| 436 | addr_strs[0] = |
| 437 | grpc_sockaddr_to_uri((const struct sockaddr *)&args->addresses->addrs[0]); |
| 438 | for (size_t i = 1; i < args->addresses->naddrs; i++) { |
| 439 | GPR_ASSERT(grpc_sockaddr_to_string( |
| 440 | &addr_strs[i], |
| 441 | (const struct sockaddr *)&args->addresses->addrs[i], |
| 442 | true) == 0); |
| 443 | } |
| 444 | size_t uri_path_len; |
| 445 | char *target_uri_str = gpr_strjoin_sep( |
| 446 | (const char **)addr_strs, args->addresses->naddrs, ",", &uri_path_len); |
| 447 | |
| 448 | /* will pick using pick_first */ |
| 449 | glb_policy->lb_channel = grpc_client_channel_factory_create_channel( |
| 450 | exec_ctx, glb_policy->cc_factory, target_uri_str, |
| 451 | GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, NULL); |
| 452 | |
| 453 | gpr_free(target_uri_str); |
| 454 | for (size_t i = 0; i < args->addresses->naddrs; i++) { |
| 455 | gpr_free(addr_strs[i]); |
| 456 | } |
| 457 | gpr_free(addr_strs); |
| 458 | |
| 459 | if (glb_policy->lb_channel == NULL) { |
| 460 | gpr_free(glb_policy); |
| 461 | return NULL; |
| 462 | } |
| 463 | |
| 464 | rr_connectivity_data *rr_connectivity = |
| 465 | gpr_malloc(sizeof(rr_connectivity_data)); |
| 466 | memset(rr_connectivity, 0, sizeof(rr_connectivity_data)); |
| 467 | grpc_closure_init(&rr_connectivity->on_change, rr_connectivity_changed, |
| 468 | rr_connectivity); |
| 469 | rr_connectivity->glb_policy = glb_policy; |
| 470 | glb_policy->rr_connectivity = rr_connectivity; |
| 471 | |
| 472 | grpc_lb_policy_init(&glb_policy->base, &glb_lb_policy_vtable); |
| 473 | gpr_mu_init(&glb_policy->mu); |
| 474 | grpc_connectivity_state_init(&glb_policy->state_tracker, GRPC_CHANNEL_IDLE, |
| 475 | "grpclb"); |
| 476 | return &glb_policy->base; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 477 | } |
| 478 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 479 | static void glb_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 480 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 481 | GPR_ASSERT(glb_policy->pending_picks == NULL); |
| 482 | GPR_ASSERT(glb_policy->pending_pings == NULL); |
| 483 | grpc_channel_destroy(glb_policy->lb_channel); |
| 484 | glb_policy->lb_channel = NULL; |
| 485 | grpc_connectivity_state_destroy(exec_ctx, &glb_policy->state_tracker); |
| 486 | if (glb_policy->serverlist != NULL) { |
| 487 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
| 488 | } |
| 489 | gpr_mu_destroy(&glb_policy->mu); |
| 490 | gpr_free(glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 491 | } |
| 492 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 493 | static void glb_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 494 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 495 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 496 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 497 | pending_pick *pp = glb_policy->pending_picks; |
| 498 | glb_policy->pending_picks = NULL; |
| 499 | pending_ping *pping = glb_policy->pending_pings; |
| 500 | glb_policy->pending_pings = NULL; |
| 501 | gpr_mu_unlock(&glb_policy->mu); |
| 502 | |
| 503 | while (pp != NULL) { |
| 504 | pending_pick *next = pp->next; |
| 505 | *pp->target = NULL; |
| 506 | grpc_exec_ctx_sched(exec_ctx, &pp->wrapped_on_complete, GRPC_ERROR_NONE, |
| 507 | NULL); |
| 508 | gpr_free(pp); |
| 509 | pp = next; |
| 510 | } |
| 511 | |
| 512 | while (pping != NULL) { |
| 513 | pending_ping *next = pping->next; |
| 514 | grpc_exec_ctx_sched(exec_ctx, &pping->wrapped_notify, GRPC_ERROR_NONE, |
| 515 | NULL); |
| 516 | pping = next; |
| 517 | } |
| 518 | |
| 519 | if (glb_policy->rr_policy) { |
| 520 | /* unsubscribe */ |
| 521 | grpc_lb_policy_notify_on_state_change( |
| 522 | exec_ctx, glb_policy->rr_policy, NULL, |
| 523 | &glb_policy->rr_connectivity->on_change); |
| 524 | GRPC_LB_POLICY_UNREF(exec_ctx, glb_policy->rr_policy, "glb_shutdown"); |
| 525 | } |
| 526 | |
| 527 | grpc_connectivity_state_set( |
| 528 | exec_ctx, &glb_policy->state_tracker, GRPC_CHANNEL_SHUTDOWN, |
| 529 | GRPC_ERROR_CREATE("Channel Shutdown"), "glb_shutdown"); |
| 530 | } |
| 531 | |
| 532 | static void glb_cancel_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 533 | grpc_connected_subchannel **target) { |
| 534 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 535 | gpr_mu_lock(&glb_policy->mu); |
| 536 | pending_pick *pp = glb_policy->pending_picks; |
| 537 | glb_policy->pending_picks = NULL; |
| 538 | while (pp != NULL) { |
| 539 | pending_pick *next = pp->next; |
| 540 | if (pp->target == target) { |
| 541 | grpc_polling_entity_del_from_pollset_set( |
| 542 | exec_ctx, pp->pollent, glb_policy->base.interested_parties); |
| 543 | *target = NULL; |
| 544 | grpc_exec_ctx_sched(exec_ctx, &pp->wrapped_on_complete, |
| 545 | GRPC_ERROR_CANCELLED, NULL); |
| 546 | gpr_free(pp); |
| 547 | } else { |
| 548 | pp->next = glb_policy->pending_picks; |
| 549 | glb_policy->pending_picks = pp; |
| 550 | } |
| 551 | pp = next; |
| 552 | } |
| 553 | gpr_mu_unlock(&glb_policy->mu); |
| 554 | } |
| 555 | |
| 556 | static grpc_call *lb_client_data_get_call(lb_client_data *lb_client); |
| 557 | static void glb_cancel_picks(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 558 | uint32_t initial_metadata_flags_mask, |
| 559 | uint32_t initial_metadata_flags_eq) { |
| 560 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 561 | gpr_mu_lock(&glb_policy->mu); |
| 562 | if (glb_policy->lb_client != NULL) { |
| 563 | /* cancel the call to the load balancer service, if any */ |
| 564 | grpc_call_cancel(lb_client_data_get_call(glb_policy->lb_client), NULL); |
| 565 | } |
| 566 | pending_pick *pp = glb_policy->pending_picks; |
| 567 | glb_policy->pending_picks = NULL; |
| 568 | while (pp != NULL) { |
| 569 | pending_pick *next = pp->next; |
| 570 | if ((pp->initial_metadata_flags & initial_metadata_flags_mask) == |
| 571 | initial_metadata_flags_eq) { |
| 572 | grpc_polling_entity_del_from_pollset_set( |
| 573 | exec_ctx, pp->pollent, glb_policy->base.interested_parties); |
| 574 | grpc_exec_ctx_sched(exec_ctx, &pp->wrapped_on_complete, |
| 575 | GRPC_ERROR_CANCELLED, NULL); |
| 576 | gpr_free(pp); |
| 577 | } else { |
| 578 | pp->next = glb_policy->pending_picks; |
| 579 | glb_policy->pending_picks = pp; |
| 580 | } |
| 581 | pp = next; |
| 582 | } |
| 583 | gpr_mu_unlock(&glb_policy->mu); |
| 584 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 585 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 586 | static void query_for_backends(grpc_exec_ctx *exec_ctx, |
| 587 | glb_lb_policy *glb_policy); |
| 588 | static void start_picking(grpc_exec_ctx *exec_ctx, glb_lb_policy *glb_policy) { |
| 589 | glb_policy->started_picking = true; |
| 590 | query_for_backends(exec_ctx, glb_policy); |
| 591 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 592 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 593 | static void glb_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 594 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 595 | gpr_mu_lock(&glb_policy->mu); |
| 596 | if (!glb_policy->started_picking) { |
| 597 | start_picking(exec_ctx, glb_policy); |
| 598 | } |
| 599 | gpr_mu_unlock(&glb_policy->mu); |
| 600 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 601 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 602 | static int glb_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 603 | grpc_polling_entity *pollent, |
| 604 | grpc_metadata_batch *initial_metadata, |
| 605 | uint32_t initial_metadata_flags, |
| 606 | grpc_connected_subchannel **target, |
| 607 | grpc_closure *on_complete) { |
| 608 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 609 | gpr_mu_lock(&glb_policy->mu); |
| 610 | int r; |
| 611 | |
| 612 | if (glb_policy->rr_policy != NULL) { |
| 613 | if (grpc_lb_glb_trace) { |
| 614 | gpr_log(GPR_INFO, "about to PICK from 0x%" PRIxPTR "", |
| 615 | (intptr_t)glb_policy->rr_policy); |
| 616 | } |
| 617 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "glb_pick"); |
| 618 | memset(&glb_policy->wc_arg, 0, sizeof(wrapped_rr_closure_arg)); |
| 619 | glb_policy->wc_arg.rr_policy = glb_policy->rr_policy; |
| 620 | glb_policy->wc_arg.wrapped_closure = on_complete; |
| 621 | grpc_closure_init(&glb_policy->wrapped_on_complete, wrapped_rr_closure, |
| 622 | &glb_policy->wc_arg); |
| 623 | r = grpc_lb_policy_pick(exec_ctx, glb_policy->rr_policy, pollent, |
| 624 | initial_metadata, initial_metadata_flags, target, |
| 625 | &glb_policy->wrapped_on_complete); |
| 626 | if (r != 0) { |
| 627 | /* the call to grpc_lb_policy_pick has been sychronous. Unreffing the RR |
| 628 | * policy and notify the original callback */ |
| 629 | glb_policy->wc_arg.wrapped_closure = NULL; |
| 630 | if (grpc_lb_glb_trace) { |
| 631 | gpr_log(GPR_INFO, "Unreffing RR (0x%" PRIxPTR ")", |
| 632 | (intptr_t)glb_policy->wc_arg.rr_policy); |
| 633 | } |
| 634 | GRPC_LB_POLICY_UNREF(exec_ctx, glb_policy->wc_arg.rr_policy, "glb_pick"); |
| 635 | grpc_exec_ctx_sched(exec_ctx, glb_policy->wc_arg.wrapped_closure, |
| 636 | GRPC_ERROR_NONE, NULL); |
| 637 | } |
| 638 | } else { |
| 639 | grpc_polling_entity_add_to_pollset_set(exec_ctx, pollent, |
| 640 | glb_policy->base.interested_parties); |
| 641 | add_pending_pick(&glb_policy->pending_picks, pollent, initial_metadata, |
| 642 | initial_metadata_flags, target, on_complete); |
| 643 | |
| 644 | if (!glb_policy->started_picking) { |
| 645 | start_picking(exec_ctx, glb_policy); |
| 646 | } |
| 647 | r = 0; |
| 648 | } |
| 649 | gpr_mu_unlock(&glb_policy->mu); |
| 650 | return r; |
| 651 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 652 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 653 | static grpc_connectivity_state glb_check_connectivity( |
| 654 | grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 655 | grpc_error **connectivity_error) { |
| 656 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 657 | grpc_connectivity_state st; |
| 658 | gpr_mu_lock(&glb_policy->mu); |
| 659 | st = grpc_connectivity_state_check(&glb_policy->state_tracker, |
| 660 | connectivity_error); |
| 661 | gpr_mu_unlock(&glb_policy->mu); |
| 662 | return st; |
| 663 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 664 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 665 | static void glb_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 666 | grpc_closure *closure) { |
| 667 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 668 | gpr_mu_lock(&glb_policy->mu); |
| 669 | if (glb_policy->rr_policy) { |
| 670 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, closure); |
| 671 | } else { |
| 672 | add_pending_ping(&glb_policy->pending_pings, closure); |
| 673 | if (!glb_policy->started_picking) { |
| 674 | start_picking(exec_ctx, glb_policy); |
| 675 | } |
| 676 | } |
| 677 | gpr_mu_unlock(&glb_policy->mu); |
| 678 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 679 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 680 | static void glb_notify_on_state_change(grpc_exec_ctx *exec_ctx, |
| 681 | grpc_lb_policy *pol, |
| 682 | grpc_connectivity_state *current, |
| 683 | grpc_closure *notify) { |
| 684 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 685 | gpr_mu_lock(&glb_policy->mu); |
| 686 | grpc_connectivity_state_notify_on_state_change( |
| 687 | exec_ctx, &glb_policy->state_tracker, current, notify); |
| 688 | |
| 689 | gpr_mu_unlock(&glb_policy->mu); |
| 690 | } |
| 691 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 692 | |
| 693 | /* |
| 694 | * lb_client_data |
| 695 | * |
| 696 | * Used internally for the client call to the LB */ |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 697 | typedef struct lb_client_data { |
| 698 | gpr_mu mu; |
| 699 | |
| 700 | /* called once initial metadata's been sent */ |
| 701 | grpc_closure md_sent; |
| 702 | |
| 703 | /* called once initial metadata's been received */ |
| 704 | grpc_closure md_rcvd; |
| 705 | |
| 706 | /* called once the LoadBalanceRequest has been sent to the LB server. See |
| 707 | * src/proto/grpc/.../load_balancer.proto */ |
| 708 | grpc_closure req_sent; |
| 709 | |
| 710 | /* A response from the LB server has been received (or error). Process it */ |
| 711 | grpc_closure res_rcvd; |
| 712 | |
| 713 | /* After the client has sent a close to the LB server */ |
| 714 | grpc_closure close_sent; |
| 715 | |
| 716 | /* ... and the status from the LB server has been received */ |
| 717 | grpc_closure srv_status_rcvd; |
| 718 | |
| 719 | grpc_call *lb_call; /* streaming call to the LB server, */ |
| 720 | gpr_timespec deadline; /* for the streaming call to the LB server */ |
| 721 | |
| 722 | grpc_metadata_array initial_metadata_recv; /* initial MD from LB server */ |
| 723 | grpc_metadata_array trailing_metadata_recv; /* trailing MD from LB server */ |
| 724 | |
| 725 | /* what's being sent to the LB server. Note that its value may vary if the LB |
| 726 | * server indicates a redirect. */ |
| 727 | grpc_byte_buffer *request_payload; |
| 728 | |
| 729 | /* response from the LB server, if any. Processed in res_recv_cb() */ |
| 730 | grpc_byte_buffer *response_payload; |
| 731 | |
| 732 | /* the call's status and status detailset in srv_status_rcvd_cb() */ |
| 733 | grpc_status_code status; |
| 734 | char *status_details; |
| 735 | size_t status_details_capacity; |
| 736 | |
| 737 | /* pointer back to the enclosing policy */ |
| 738 | glb_lb_policy *glb_policy; |
| 739 | } lb_client_data; |
| 740 | |
| 741 | static void md_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error); |
| 742 | static void md_recv_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error); |
| 743 | static void req_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 744 | static void res_recv_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error); |
| 745 | static void close_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, |
| 746 | grpc_error *error); |
| 747 | static void srv_status_rcvd_cb(grpc_exec_ctx *exec_ctx, void *arg, |
| 748 | grpc_error *error); |
| 749 | |
| 750 | static lb_client_data *lb_client_data_create(glb_lb_policy *glb_policy) { |
| 751 | lb_client_data *lb_client = gpr_malloc(sizeof(lb_client_data)); |
| 752 | memset(lb_client, 0, sizeof(lb_client_data)); |
| 753 | |
| 754 | gpr_mu_init(&lb_client->mu); |
| 755 | grpc_closure_init(&lb_client->md_sent, md_sent_cb, lb_client); |
| 756 | |
| 757 | grpc_closure_init(&lb_client->md_rcvd, md_recv_cb, lb_client); |
| 758 | grpc_closure_init(&lb_client->req_sent, req_sent_cb, lb_client); |
| 759 | grpc_closure_init(&lb_client->res_rcvd, res_recv_cb, lb_client); |
| 760 | grpc_closure_init(&lb_client->close_sent, close_sent_cb, lb_client); |
| 761 | grpc_closure_init(&lb_client->srv_status_rcvd, srv_status_rcvd_cb, lb_client); |
| 762 | |
| 763 | /* TODO(dgq): get the deadline from the client config instead of fabricating |
| 764 | * one here. */ |
| 765 | lb_client->deadline = gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), |
| 766 | gpr_time_from_seconds(3, GPR_TIMESPAN)); |
| 767 | |
| 768 | lb_client->lb_call = grpc_channel_create_pollset_set_call( |
| 769 | glb_policy->lb_channel, NULL, GRPC_PROPAGATE_DEFAULTS, |
| 770 | glb_policy->base.interested_parties, "/BalanceLoad", |
| 771 | NULL, /* FIXME(dgq): which "host" value to use? */ |
| 772 | lb_client->deadline, NULL); |
| 773 | |
| 774 | grpc_metadata_array_init(&lb_client->initial_metadata_recv); |
| 775 | grpc_metadata_array_init(&lb_client->trailing_metadata_recv); |
| 776 | |
| 777 | grpc_grpclb_request *request = grpc_grpclb_request_create( |
| 778 | "load.balanced.service.name"); /* FIXME(dgq): get the name of the load |
| 779 | balanced service from the resolver */ |
| 780 | gpr_slice request_payload_slice = grpc_grpclb_request_encode(request); |
| 781 | lb_client->request_payload = |
| 782 | grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
| 783 | gpr_slice_unref(request_payload_slice); |
| 784 | grpc_grpclb_request_destroy(request); |
| 785 | |
| 786 | lb_client->status_details = NULL; |
| 787 | lb_client->status_details_capacity = 0; |
| 788 | lb_client->glb_policy = glb_policy; |
| 789 | return lb_client; |
| 790 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 791 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 792 | static void lb_client_data_destroy(lb_client_data *lb_client) { |
| 793 | grpc_metadata_array_destroy(&lb_client->initial_metadata_recv); |
| 794 | grpc_metadata_array_destroy(&lb_client->trailing_metadata_recv); |
| 795 | |
| 796 | grpc_byte_buffer_destroy(lb_client->request_payload); |
| 797 | |
| 798 | gpr_free(lb_client->status_details); |
| 799 | gpr_mu_destroy(&lb_client->mu); |
| 800 | gpr_free(lb_client); |
| 801 | } |
| 802 | static grpc_call *lb_client_data_get_call(lb_client_data *lb_client) { |
| 803 | return lb_client->lb_call; |
| 804 | } |
| 805 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 806 | /* |
| 807 | * Auxiliary functions and LB client callbacks. |
| 808 | */ |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 809 | static void query_for_backends(grpc_exec_ctx *exec_ctx, |
| 810 | glb_lb_policy *glb_policy) { |
| 811 | GPR_ASSERT(glb_policy->lb_channel != NULL); |
| 812 | |
| 813 | glb_policy->lb_client = lb_client_data_create(glb_policy); |
| 814 | grpc_call_error call_error; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 815 | grpc_op ops[1]; |
| 816 | memset(ops, 0, sizeof(ops)); |
| 817 | grpc_op *op = ops; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 818 | op->op = GRPC_OP_SEND_INITIAL_METADATA; |
| 819 | op->data.send_initial_metadata.count = 0; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 820 | op->flags = 0; |
| 821 | op->reserved = NULL; |
| 822 | op++; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 823 | call_error = grpc_call_start_batch_and_execute( |
| 824 | exec_ctx, glb_policy->lb_client->lb_call, ops, (size_t)(op - ops), |
| 825 | &glb_policy->lb_client->md_sent); |
| 826 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 827 | |
| 828 | op = ops; |
| 829 | op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; |
| 830 | op->data.recv_status_on_client.trailing_metadata = |
| 831 | &glb_policy->lb_client->trailing_metadata_recv; |
| 832 | op->data.recv_status_on_client.status = &glb_policy->lb_client->status; |
| 833 | op->data.recv_status_on_client.status_details = |
| 834 | &glb_policy->lb_client->status_details; |
| 835 | op->data.recv_status_on_client.status_details_capacity = |
| 836 | &glb_policy->lb_client->status_details_capacity; |
| 837 | op->flags = 0; |
| 838 | op->reserved = NULL; |
| 839 | op++; |
| 840 | call_error = grpc_call_start_batch_and_execute( |
| 841 | exec_ctx, glb_policy->lb_client->lb_call, ops, (size_t)(op - ops), |
| 842 | &glb_policy->lb_client->srv_status_rcvd); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 843 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 844 | } |
| 845 | |
David Garcia Quintas | 4166cb0 | 2016-07-29 14:33:15 -0700 | [diff] [blame] | 846 | static void md_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
| 847 | lb_client_data *lb_client = arg; |
| 848 | GPR_ASSERT(lb_client->lb_call); |
| 849 | grpc_op ops[1]; |
| 850 | memset(ops, 0, sizeof(ops)); |
| 851 | grpc_op *op = ops; |
| 852 | op->op = GRPC_OP_RECV_INITIAL_METADATA; |
| 853 | op->data.recv_initial_metadata = &lb_client->initial_metadata_recv; |
| 854 | op->flags = 0; |
| 855 | op->reserved = NULL; |
| 856 | op++; |
| 857 | grpc_call_error call_error = grpc_call_start_batch_and_execute( |
| 858 | exec_ctx, lb_client->lb_call, ops, (size_t)(op - ops), |
| 859 | &lb_client->md_rcvd); |
| 860 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 861 | } |
| 862 | |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 863 | static void md_recv_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 864 | lb_client_data *lb_client = arg; |
| 865 | GPR_ASSERT(lb_client->lb_call); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 866 | grpc_op ops[1]; |
| 867 | memset(ops, 0, sizeof(ops)); |
| 868 | grpc_op *op = ops; |
| 869 | |
| 870 | op->op = GRPC_OP_SEND_MESSAGE; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 871 | op->data.send_message = lb_client->request_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 872 | op->flags = 0; |
| 873 | op->reserved = NULL; |
| 874 | op++; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 875 | grpc_call_error call_error = grpc_call_start_batch_and_execute( |
| 876 | exec_ctx, lb_client->lb_call, ops, (size_t)(op - ops), |
| 877 | &lb_client->req_sent); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 878 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 879 | } |
| 880 | |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 881 | static void req_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 882 | lb_client_data *lb_client = arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 883 | |
| 884 | grpc_op ops[1]; |
| 885 | memset(ops, 0, sizeof(ops)); |
| 886 | grpc_op *op = ops; |
| 887 | |
| 888 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 889 | op->data.recv_message = &lb_client->response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 890 | op->flags = 0; |
| 891 | op->reserved = NULL; |
| 892 | op++; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 893 | grpc_call_error call_error = grpc_call_start_batch_and_execute( |
| 894 | exec_ctx, lb_client->lb_call, ops, (size_t)(op - ops), |
| 895 | &lb_client->res_rcvd); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 896 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 897 | } |
| 898 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 899 | static void res_recv_cb(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 900 | lb_client_data *lb_client = arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 901 | grpc_op ops[2]; |
| 902 | memset(ops, 0, sizeof(ops)); |
| 903 | grpc_op *op = ops; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 904 | if (lb_client->response_payload != NULL) { |
| 905 | /* Received data from the LB server. Look inside |
| 906 | * lb_client->response_payload, for |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 907 | * a serverlist. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 908 | grpc_byte_buffer_reader bbr; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 909 | grpc_byte_buffer_reader_init(&bbr, lb_client->response_payload); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 910 | gpr_slice response_slice = grpc_byte_buffer_reader_readall(&bbr); |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 911 | grpc_byte_buffer_destroy(lb_client->response_payload); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 912 | grpc_grpclb_serverlist *serverlist = |
| 913 | grpc_grpclb_response_parse_serverlist(response_slice); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 914 | if (serverlist != NULL) { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 915 | gpr_slice_unref(response_slice); |
| 916 | if (grpc_lb_glb_trace) { |
| 917 | gpr_log(GPR_INFO, "Serverlist with %zu servers received", |
| 918 | serverlist->num_servers); |
| 919 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 920 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 921 | /* update serverlist */ |
| 922 | if (serverlist->num_servers > 0) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 923 | if (grpc_grpclb_serverlist_equals(lb_client->glb_policy->serverlist, |
| 924 | serverlist)) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 925 | if (grpc_lb_glb_trace) { |
| 926 | gpr_log(GPR_INFO, |
| 927 | "Incoming server list identical to current, ignoring."); |
| 928 | } |
| 929 | } else { /* new serverlist */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 930 | if (lb_client->glb_policy->serverlist != NULL) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 931 | /* dispose of the old serverlist */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 932 | grpc_grpclb_destroy_serverlist(lb_client->glb_policy->serverlist); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 933 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 934 | /* and update the copy in the glb_lb_policy instance */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 935 | lb_client->glb_policy->serverlist = serverlist; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 936 | } |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 937 | if (lb_client->glb_policy->rr_policy == NULL) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 938 | /* initial "handover", in this case from a null RR policy, meaning |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 939 | * it'll just create the first RR policy instance */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 940 | rr_handover(exec_ctx, lb_client->glb_policy, error); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 941 | } else { |
| 942 | /* unref the RR policy, eventually leading to its substitution with a |
| 943 | * new one constructed from the received serverlist (see |
| 944 | * rr_connectivity_changed) */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 945 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_client->glb_policy->rr_policy, |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 946 | "serverlist_received"); |
| 947 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 948 | } else { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 949 | if (grpc_lb_glb_trace) { |
| 950 | gpr_log(GPR_INFO, |
| 951 | "Received empty server list. Picks will stay pending until a " |
| 952 | "response with > 0 servers is received"); |
| 953 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 954 | } |
| 955 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 956 | /* keep listening for serverlist updates */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 957 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 958 | op->data.recv_message = &lb_client->response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 959 | op->flags = 0; |
| 960 | op->reserved = NULL; |
| 961 | op++; |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 962 | const grpc_call_error call_error = grpc_call_start_batch_and_execute( |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 963 | exec_ctx, lb_client->lb_call, ops, (size_t)(op - ops), |
| 964 | &lb_client->res_rcvd); /* loop */ |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 965 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 966 | return; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 967 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 968 | |
| 969 | GPR_ASSERT(serverlist == NULL); |
| 970 | gpr_log(GPR_ERROR, "Invalid LB response received: '%s'", |
| 971 | gpr_dump_slice(response_slice, GPR_DUMP_ASCII)); |
| 972 | gpr_slice_unref(response_slice); |
| 973 | |
| 974 | /* Disconnect from server returning invalid response. */ |
| 975 | op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT; |
| 976 | op->flags = 0; |
| 977 | op->reserved = NULL; |
| 978 | op++; |
| 979 | grpc_call_error call_error = grpc_call_start_batch_and_execute( |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 980 | exec_ctx, lb_client->lb_call, ops, (size_t)(op - ops), |
| 981 | &lb_client->close_sent); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 982 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 983 | } |
| 984 | /* empty payload: call cancelled by server. Cleanups happening in |
| 985 | * srv_status_rcvd_cb */ |
| 986 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 987 | |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 988 | static void close_sent_cb(grpc_exec_ctx *exec_ctx, void *arg, |
| 989 | grpc_error *error) { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 990 | if (grpc_lb_glb_trace) { |
| 991 | gpr_log(GPR_INFO, |
| 992 | "Close from LB client sent. Waiting from server status now"); |
| 993 | } |
| 994 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 995 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 996 | static void srv_status_rcvd_cb(grpc_exec_ctx *exec_ctx, void *arg, |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 997 | grpc_error *error) { |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 998 | lb_client_data *lb_client = arg; |
| 999 | glb_lb_policy *glb_policy = lb_client->glb_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1000 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1001 | gpr_log(GPR_INFO, |
| 1002 | "status from lb server received. Status = %d, Details = '%s', " |
| 1003 | "Capaticy " |
| 1004 | "= %zu", |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 1005 | lb_client->status, lb_client->status_details, |
| 1006 | lb_client->status_details_capacity); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 1009 | grpc_call_destroy(lb_client->lb_call); |
| 1010 | lb_client_data_destroy(lb_client); |
| 1011 | glb_policy->lb_client = NULL; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 1012 | /* TODO(dgq): deal with stream termination properly (fire up another one? fail |
| 1013 | * the original call?) */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1014 | } |
| 1015 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame^] | 1016 | /* Code wiring the policy with the rest of the core */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1017 | static const grpc_lb_policy_vtable glb_lb_policy_vtable = { |
| 1018 | glb_destroy, glb_shutdown, glb_pick, |
| 1019 | glb_cancel_pick, glb_cancel_picks, glb_ping_one, |
| 1020 | glb_exit_idle, glb_check_connectivity, glb_notify_on_state_change}; |
| 1021 | |
| 1022 | static void glb_factory_ref(grpc_lb_policy_factory *factory) {} |
| 1023 | |
| 1024 | static void glb_factory_unref(grpc_lb_policy_factory *factory) {} |
| 1025 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1026 | static const grpc_lb_policy_factory_vtable glb_factory_vtable = { |
| 1027 | glb_factory_ref, glb_factory_unref, glb_create, "grpclb"}; |
| 1028 | |
| 1029 | static grpc_lb_policy_factory glb_lb_policy_factory = {&glb_factory_vtable}; |
| 1030 | |
| 1031 | grpc_lb_policy_factory *grpc_glb_lb_factory_create() { |
| 1032 | return &glb_lb_policy_factory; |
| 1033 | } |
| 1034 | |
| 1035 | /* Plugin registration */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1036 | void grpc_lb_policy_grpclb_init() { |
| 1037 | grpc_register_lb_policy(grpc_glb_lb_factory_create()); |
| 1038 | grpc_register_tracer("glb", &grpc_lb_glb_trace); |
| 1039 | } |
| 1040 | |
| 1041 | void grpc_lb_policy_grpclb_shutdown() {} |