| /* |
| * |
| * Copyright 2016 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/channel/handshaker.h" |
| #include "src/core/lib/iomgr/timer.h" |
| |
| // |
| // grpc_handshaker |
| // |
| |
| void grpc_handshaker_init(const grpc_handshaker_vtable* vtable, |
| grpc_handshaker* handshaker) { |
| handshaker->vtable = vtable; |
| } |
| |
| void grpc_handshaker_destroy(grpc_handshaker* handshaker) { |
| handshaker->vtable->destroy(handshaker); |
| } |
| |
| void grpc_handshaker_shutdown(grpc_handshaker* handshaker, grpc_error* why) { |
| handshaker->vtable->shutdown(handshaker, why); |
| } |
| |
| void grpc_handshaker_do_handshake(grpc_handshaker* handshaker, |
| grpc_tcp_server_acceptor* acceptor, |
| grpc_closure* on_handshake_done, |
| grpc_handshaker_args* args) { |
| handshaker->vtable->do_handshake(handshaker, acceptor, on_handshake_done, |
| args); |
| } |
| |
| // |
| // grpc_handshake_manager |
| // |
| |
| struct grpc_handshake_manager { |
| gpr_mu mu; |
| gpr_refcount refs; |
| bool shutdown; |
| // An array of handshakers added via grpc_handshake_manager_add(). |
| size_t count; |
| grpc_handshaker** handshakers; |
| // The index of the handshaker to invoke next and closure to invoke it. |
| size_t index; |
| grpc_closure call_next_handshaker; |
| // The acceptor to call the handshakers with. |
| grpc_tcp_server_acceptor* acceptor; |
| // Deadline timer across all handshakers. |
| grpc_timer deadline_timer; |
| grpc_closure on_timeout; |
| // The final callback and user_data to invoke after the last handshaker. |
| grpc_closure on_handshake_done; |
| void* user_data; |
| // Handshaker args. |
| grpc_handshaker_args args; |
| // Links to the previous and next managers in a list of all pending handshakes |
| // Used at server side only. |
| grpc_handshake_manager* prev; |
| grpc_handshake_manager* next; |
| }; |
| |
| grpc_handshake_manager* grpc_handshake_manager_create() { |
| grpc_handshake_manager* mgr = |
| (grpc_handshake_manager*)gpr_zalloc(sizeof(grpc_handshake_manager)); |
| gpr_mu_init(&mgr->mu); |
| gpr_ref_init(&mgr->refs, 1); |
| return mgr; |
| } |
| |
| void grpc_handshake_manager_pending_list_add(grpc_handshake_manager** head, |
| grpc_handshake_manager* mgr) { |
| GPR_ASSERT(mgr->prev == nullptr); |
| GPR_ASSERT(mgr->next == nullptr); |
| mgr->next = *head; |
| if (*head) { |
| (*head)->prev = mgr; |
| } |
| *head = mgr; |
| } |
| |
| void grpc_handshake_manager_pending_list_remove(grpc_handshake_manager** head, |
| grpc_handshake_manager* mgr) { |
| if (mgr->next != nullptr) { |
| mgr->next->prev = mgr->prev; |
| } |
| if (mgr->prev != nullptr) { |
| mgr->prev->next = mgr->next; |
| } else { |
| GPR_ASSERT(*head == mgr); |
| *head = mgr->next; |
| } |
| } |
| |
| void grpc_handshake_manager_pending_list_shutdown_all( |
| grpc_handshake_manager* head, grpc_error* why) { |
| while (head != nullptr) { |
| grpc_handshake_manager_shutdown(head, GRPC_ERROR_REF(why)); |
| head = head->next; |
| } |
| GRPC_ERROR_UNREF(why); |
| } |
| |
| static bool is_power_of_2(size_t n) { return (n & (n - 1)) == 0; } |
| |
| void grpc_handshake_manager_add(grpc_handshake_manager* mgr, |
| grpc_handshaker* handshaker) { |
| gpr_mu_lock(&mgr->mu); |
| // To avoid allocating memory for each handshaker we add, we double |
| // the number of elements every time we need more. |
| size_t realloc_count = 0; |
| if (mgr->count == 0) { |
| realloc_count = 2; |
| } else if (mgr->count >= 2 && is_power_of_2(mgr->count)) { |
| realloc_count = mgr->count * 2; |
| } |
| if (realloc_count > 0) { |
| mgr->handshakers = (grpc_handshaker**)gpr_realloc( |
| mgr->handshakers, realloc_count * sizeof(grpc_handshaker*)); |
| } |
| mgr->handshakers[mgr->count++] = handshaker; |
| gpr_mu_unlock(&mgr->mu); |
| } |
| |
| static void grpc_handshake_manager_unref(grpc_handshake_manager* mgr) { |
| if (gpr_unref(&mgr->refs)) { |
| for (size_t i = 0; i < mgr->count; ++i) { |
| grpc_handshaker_destroy(mgr->handshakers[i]); |
| } |
| gpr_free(mgr->handshakers); |
| gpr_mu_destroy(&mgr->mu); |
| gpr_free(mgr); |
| } |
| } |
| |
| void grpc_handshake_manager_destroy(grpc_handshake_manager* mgr) { |
| grpc_handshake_manager_unref(mgr); |
| } |
| |
| void grpc_handshake_manager_shutdown(grpc_handshake_manager* mgr, |
| grpc_error* why) { |
| gpr_mu_lock(&mgr->mu); |
| // Shutdown the handshaker that's currently in progress, if any. |
| if (!mgr->shutdown && mgr->index > 0) { |
| mgr->shutdown = true; |
| grpc_handshaker_shutdown(mgr->handshakers[mgr->index - 1], |
| GRPC_ERROR_REF(why)); |
| } |
| gpr_mu_unlock(&mgr->mu); |
| GRPC_ERROR_UNREF(why); |
| } |
| |
| // Helper function to call either the next handshaker or the |
| // on_handshake_done callback. |
| // Returns true if we've scheduled the on_handshake_done callback. |
| static bool call_next_handshaker_locked(grpc_handshake_manager* mgr, |
| grpc_error* error) { |
| GPR_ASSERT(mgr->index <= mgr->count); |
| // If we got an error or we've been shut down or we're exiting early or |
| // we've finished the last handshaker, invoke the on_handshake_done |
| // callback. Otherwise, call the next handshaker. |
| if (error != GRPC_ERROR_NONE || mgr->shutdown || mgr->args.exit_early || |
| mgr->index == mgr->count) { |
| // Cancel deadline timer, since we're invoking the on_handshake_done |
| // callback now. |
| grpc_timer_cancel(&mgr->deadline_timer); |
| GRPC_CLOSURE_SCHED(&mgr->on_handshake_done, error); |
| mgr->shutdown = true; |
| } else { |
| grpc_handshaker_do_handshake(mgr->handshakers[mgr->index], mgr->acceptor, |
| &mgr->call_next_handshaker, &mgr->args); |
| } |
| ++mgr->index; |
| return mgr->shutdown; |
| } |
| |
| // A function used as the handshaker-done callback when chaining |
| // handshakers together. |
| static void call_next_handshaker(void* arg, grpc_error* error) { |
| grpc_handshake_manager* mgr = (grpc_handshake_manager*)arg; |
| gpr_mu_lock(&mgr->mu); |
| bool done = call_next_handshaker_locked(mgr, GRPC_ERROR_REF(error)); |
| gpr_mu_unlock(&mgr->mu); |
| // If we're invoked the final callback, we won't be coming back |
| // to this function, so we can release our reference to the |
| // handshake manager. |
| if (done) { |
| grpc_handshake_manager_unref(mgr); |
| } |
| } |
| |
| // Callback invoked when deadline is exceeded. |
| static void on_timeout(void* arg, grpc_error* error) { |
| grpc_handshake_manager* mgr = (grpc_handshake_manager*)arg; |
| if (error == GRPC_ERROR_NONE) { // Timer fired, rather than being cancelled. |
| grpc_handshake_manager_shutdown( |
| mgr, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Handshake timed out")); |
| } |
| grpc_handshake_manager_unref(mgr); |
| } |
| |
| void grpc_handshake_manager_do_handshake( |
| grpc_handshake_manager* mgr, grpc_pollset_set* interested_parties, |
| grpc_endpoint* endpoint, const grpc_channel_args* channel_args, |
| grpc_millis deadline, grpc_tcp_server_acceptor* acceptor, |
| grpc_iomgr_cb_func on_handshake_done, void* user_data) { |
| gpr_mu_lock(&mgr->mu); |
| GPR_ASSERT(mgr->index == 0); |
| GPR_ASSERT(!mgr->shutdown); |
| // Construct handshaker args. These will be passed through all |
| // handshakers and eventually be freed by the on_handshake_done callback. |
| mgr->args.interested_parties = interested_parties; |
| mgr->args.endpoint = endpoint; |
| mgr->args.args = grpc_channel_args_copy(channel_args); |
| mgr->args.user_data = user_data; |
| mgr->args.read_buffer = |
| (grpc_slice_buffer*)gpr_malloc(sizeof(*mgr->args.read_buffer)); |
| grpc_slice_buffer_init(mgr->args.read_buffer); |
| // Initialize state needed for calling handshakers. |
| mgr->acceptor = acceptor; |
| GRPC_CLOSURE_INIT(&mgr->call_next_handshaker, call_next_handshaker, mgr, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&mgr->on_handshake_done, on_handshake_done, &mgr->args, |
| grpc_schedule_on_exec_ctx); |
| // Start deadline timer, which owns a ref. |
| gpr_ref(&mgr->refs); |
| GRPC_CLOSURE_INIT(&mgr->on_timeout, on_timeout, mgr, |
| grpc_schedule_on_exec_ctx); |
| grpc_timer_init(&mgr->deadline_timer, deadline, &mgr->on_timeout); |
| // Start first handshaker, which also owns a ref. |
| gpr_ref(&mgr->refs); |
| bool done = call_next_handshaker_locked(mgr, GRPC_ERROR_NONE); |
| gpr_mu_unlock(&mgr->mu); |
| if (done) { |
| grpc_handshake_manager_unref(mgr); |
| } |
| } |