mirror of https://github.com/grpc/grpc.git
Mark D. Roth
7 years ago
parent
d536dba4d3
commit
7c1b5db3bb
20 changed files with 822 additions and 764 deletions
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/*
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* |
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* Copyright 2015 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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#include <grpc/support/port_platform.h> |
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#include <string.h> |
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#include <grpc/support/alloc.h> |
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#include "src/core/ext/filters/client_channel/lb_policy/subchannel_list.h" |
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#include "src/core/lib/channel/channel_args.h" |
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#include "src/core/lib/debug/trace.h" |
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#include "src/core/lib/iomgr/closure.h" |
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#include "src/core/lib/iomgr/combiner.h" |
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#include "src/core/lib/iomgr/sockaddr_utils.h" |
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#include "src/core/lib/transport/connectivity_state.h" |
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void grpc_lb_subchannel_data_unref_subchannel(grpc_lb_subchannel_data* sd, |
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const char* reason) { |
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if (sd->subchannel != nullptr) { |
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if (sd->subchannel_list->tracer->enabled()) { |
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gpr_log(GPR_DEBUG, |
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"[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR |
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" (subchannel %p): unreffing subchannel", |
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sd->subchannel_list->tracer->name(), sd->subchannel_list->policy, |
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sd->subchannel_list, |
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static_cast<size_t>(sd - sd->subchannel_list->subchannels), |
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sd->subchannel_list->num_subchannels, sd->subchannel); |
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} |
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GRPC_SUBCHANNEL_UNREF(sd->subchannel, reason); |
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sd->subchannel = nullptr; |
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sd->connected_subchannel.reset(); |
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if (sd->user_data != nullptr) { |
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GPR_ASSERT(sd->user_data_vtable != nullptr); |
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sd->user_data_vtable->destroy(sd->user_data); |
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sd->user_data = nullptr; |
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} |
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} |
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} |
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void grpc_lb_subchannel_data_start_connectivity_watch( |
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grpc_lb_subchannel_data* sd) { |
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if (sd->subchannel_list->tracer->enabled()) { |
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gpr_log( |
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GPR_DEBUG, |
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"[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR |
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" (subchannel %p): requesting connectivity change " |
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"notification (from %s)", |
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sd->subchannel_list->tracer->name(), sd->subchannel_list->policy, |
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sd->subchannel_list, |
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static_cast<size_t>(sd - sd->subchannel_list->subchannels), |
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sd->subchannel_list->num_subchannels, sd->subchannel, |
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grpc_connectivity_state_name(sd->pending_connectivity_state_unsafe)); |
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} |
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sd->connectivity_notification_pending = true; |
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grpc_subchannel_notify_on_state_change( |
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sd->subchannel, sd->subchannel_list->policy->interested_parties(), |
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&sd->pending_connectivity_state_unsafe, |
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&sd->connectivity_changed_closure); |
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} |
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void grpc_lb_subchannel_data_stop_connectivity_watch( |
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grpc_lb_subchannel_data* sd) { |
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if (sd->subchannel_list->tracer->enabled()) { |
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gpr_log(GPR_DEBUG, |
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"[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR |
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" (subchannel %p): stopping connectivity watch", |
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sd->subchannel_list->tracer->name(), sd->subchannel_list->policy, |
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sd->subchannel_list, |
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static_cast<size_t>(sd - sd->subchannel_list->subchannels), |
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sd->subchannel_list->num_subchannels, sd->subchannel); |
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} |
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GPR_ASSERT(sd->connectivity_notification_pending); |
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sd->connectivity_notification_pending = false; |
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} |
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grpc_lb_subchannel_list* grpc_lb_subchannel_list_create( |
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grpc_core::LoadBalancingPolicy* p, grpc_core::TraceFlag* tracer, |
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const grpc_lb_addresses* addresses, grpc_combiner* combiner, |
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grpc_client_channel_factory* client_channel_factory, |
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const grpc_channel_args& args, grpc_iomgr_cb_func connectivity_changed_cb) { |
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grpc_lb_subchannel_list* subchannel_list = |
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static_cast<grpc_lb_subchannel_list*>( |
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gpr_zalloc(sizeof(*subchannel_list))); |
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if (tracer->enabled()) { |
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gpr_log(GPR_DEBUG, |
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"[%s %p] Creating subchannel list %p for %" PRIuPTR " subchannels", |
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tracer->name(), p, subchannel_list, addresses->num_addresses); |
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} |
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subchannel_list->policy = p; |
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subchannel_list->tracer = tracer; |
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gpr_ref_init(&subchannel_list->refcount, 1); |
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subchannel_list->subchannels = static_cast<grpc_lb_subchannel_data*>( |
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gpr_zalloc(sizeof(grpc_lb_subchannel_data) * addresses->num_addresses)); |
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// We need to remove the LB addresses in order to be able to compare the
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// subchannel keys of subchannels from a different batch of addresses.
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static const char* keys_to_remove[] = {GRPC_ARG_SUBCHANNEL_ADDRESS, |
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GRPC_ARG_LB_ADDRESSES}; |
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// Create a subchannel for each address.
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grpc_subchannel_args sc_args; |
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size_t subchannel_index = 0; |
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for (size_t i = 0; i < addresses->num_addresses; i++) { |
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// If there were any balancer, we would have chosen grpclb policy instead.
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GPR_ASSERT(!addresses->addresses[i].is_balancer); |
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memset(&sc_args, 0, sizeof(grpc_subchannel_args)); |
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grpc_arg addr_arg = |
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grpc_create_subchannel_address_arg(&addresses->addresses[i].address); |
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grpc_channel_args* new_args = grpc_channel_args_copy_and_add_and_remove( |
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&args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), &addr_arg, 1); |
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gpr_free(addr_arg.value.string); |
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sc_args.args = new_args; |
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grpc_subchannel* subchannel = grpc_client_channel_factory_create_subchannel( |
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client_channel_factory, &sc_args); |
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grpc_channel_args_destroy(new_args); |
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if (subchannel == nullptr) { |
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// Subchannel could not be created.
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if (tracer->enabled()) { |
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char* address_uri = |
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grpc_sockaddr_to_uri(&addresses->addresses[i].address); |
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gpr_log(GPR_DEBUG, |
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"[%s %p] could not create subchannel for address uri %s, " |
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"ignoring", |
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tracer->name(), subchannel_list->policy, address_uri); |
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gpr_free(address_uri); |
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} |
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continue; |
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} |
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if (tracer->enabled()) { |
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char* address_uri = |
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grpc_sockaddr_to_uri(&addresses->addresses[i].address); |
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gpr_log(GPR_DEBUG, |
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"[%s %p] subchannel list %p index %" PRIuPTR |
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": Created subchannel %p for address uri %s", |
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tracer->name(), p, subchannel_list, subchannel_index, subchannel, |
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address_uri); |
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gpr_free(address_uri); |
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} |
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grpc_lb_subchannel_data* sd = |
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&subchannel_list->subchannels[subchannel_index++]; |
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sd->subchannel_list = subchannel_list; |
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sd->subchannel = subchannel; |
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GRPC_CLOSURE_INIT(&sd->connectivity_changed_closure, |
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connectivity_changed_cb, sd, |
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grpc_combiner_scheduler(combiner)); |
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// We assume that the current state is IDLE. If not, we'll get a
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// callback telling us that.
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sd->prev_connectivity_state = GRPC_CHANNEL_IDLE; |
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sd->curr_connectivity_state = GRPC_CHANNEL_IDLE; |
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sd->pending_connectivity_state_unsafe = GRPC_CHANNEL_IDLE; |
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sd->user_data_vtable = addresses->user_data_vtable; |
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if (sd->user_data_vtable != nullptr) { |
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sd->user_data = |
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sd->user_data_vtable->copy(addresses->addresses[i].user_data); |
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} |
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} |
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subchannel_list->num_subchannels = subchannel_index; |
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subchannel_list->num_idle = subchannel_index; |
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return subchannel_list; |
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} |
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static void subchannel_list_destroy(grpc_lb_subchannel_list* subchannel_list) { |
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if (subchannel_list->tracer->enabled()) { |
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gpr_log(GPR_DEBUG, "[%s %p] Destroying subchannel_list %p", |
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subchannel_list->tracer->name(), subchannel_list->policy, |
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subchannel_list); |
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} |
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for (size_t i = 0; i < subchannel_list->num_subchannels; i++) { |
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grpc_lb_subchannel_data* sd = &subchannel_list->subchannels[i]; |
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grpc_lb_subchannel_data_unref_subchannel(sd, "subchannel_list_destroy"); |
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} |
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gpr_free(subchannel_list->subchannels); |
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gpr_free(subchannel_list); |
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} |
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void grpc_lb_subchannel_list_ref(grpc_lb_subchannel_list* subchannel_list, |
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const char* reason) { |
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gpr_ref_non_zero(&subchannel_list->refcount); |
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if (subchannel_list->tracer->enabled()) { |
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const gpr_atm count = gpr_atm_acq_load(&subchannel_list->refcount.count); |
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gpr_log(GPR_DEBUG, "[%s %p] subchannel_list %p REF %lu->%lu (%s)", |
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subchannel_list->tracer->name(), subchannel_list->policy, |
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subchannel_list, static_cast<unsigned long>(count - 1), |
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static_cast<unsigned long>(count), reason); |
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} |
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} |
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void grpc_lb_subchannel_list_unref(grpc_lb_subchannel_list* subchannel_list, |
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const char* reason) { |
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const bool done = gpr_unref(&subchannel_list->refcount); |
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if (subchannel_list->tracer->enabled()) { |
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const gpr_atm count = gpr_atm_acq_load(&subchannel_list->refcount.count); |
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gpr_log(GPR_DEBUG, "[%s %p] subchannel_list %p UNREF %lu->%lu (%s)", |
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subchannel_list->tracer->name(), subchannel_list->policy, |
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subchannel_list, static_cast<unsigned long>(count + 1), |
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static_cast<unsigned long>(count), reason); |
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} |
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if (done) { |
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subchannel_list_destroy(subchannel_list); |
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} |
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} |
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static void subchannel_data_cancel_connectivity_watch( |
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grpc_lb_subchannel_data* sd, const char* reason) { |
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if (sd->subchannel_list->tracer->enabled()) { |
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gpr_log(GPR_DEBUG, |
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"[%s %p] subchannel list %p index %" PRIuPTR " of %" PRIuPTR |
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" (subchannel %p): canceling connectivity watch (%s)", |
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sd->subchannel_list->tracer->name(), sd->subchannel_list->policy, |
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sd->subchannel_list, |
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static_cast<size_t>(sd - sd->subchannel_list->subchannels), |
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sd->subchannel_list->num_subchannels, sd->subchannel, reason); |
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} |
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grpc_subchannel_notify_on_state_change(sd->subchannel, nullptr, nullptr, |
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&sd->connectivity_changed_closure); |
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} |
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void grpc_lb_subchannel_list_shutdown_and_unref( |
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grpc_lb_subchannel_list* subchannel_list, const char* reason) { |
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if (subchannel_list->tracer->enabled()) { |
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gpr_log(GPR_DEBUG, "[%s %p] Shutting down subchannel_list %p (%s)", |
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subchannel_list->tracer->name(), subchannel_list->policy, |
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subchannel_list, reason); |
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} |
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GPR_ASSERT(!subchannel_list->shutting_down); |
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subchannel_list->shutting_down = true; |
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for (size_t i = 0; i < subchannel_list->num_subchannels; i++) { |
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grpc_lb_subchannel_data* sd = &subchannel_list->subchannels[i]; |
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// If there's a pending notification for this subchannel, cancel it;
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// the callback is responsible for unreffing the subchannel.
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// Otherwise, unref the subchannel directly.
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if (sd->connectivity_notification_pending) { |
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subchannel_data_cancel_connectivity_watch(sd, reason); |
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} else if (sd->subchannel != nullptr) { |
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grpc_lb_subchannel_data_unref_subchannel(sd, reason); |
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} |
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} |
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grpc_lb_subchannel_list_unref(subchannel_list, reason); |
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} |
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