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author | 2017-09-21 18:56:08 -0700 | |
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committer | 2017-10-02 16:29:41 -0700 | |
commit | 83062842c3601faeddcae8f901c515e3c78f3661 (patch) | |
tree | 58536b25350a5f2b3123161ab4ca9b8ce01a43a5 /src/core/lib/channel/handshaker.cc | |
parent | 1c9b584a153ff592c92b6cf6baa620d8602a37cd (diff) |
Changes for C to C++. Adding extern C to header files for compatibility.
Also converting to .cc
Diffstat (limited to 'src/core/lib/channel/handshaker.cc')
-rw-r--r-- | src/core/lib/channel/handshaker.cc | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/src/core/lib/channel/handshaker.cc b/src/core/lib/channel/handshaker.cc new file mode 100644 index 0000000000..1753da5721 --- /dev/null +++ b/src/core/lib/channel/handshaker.cc @@ -0,0 +1,268 @@ +/* + * + * 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_exec_ctx* exec_ctx, + grpc_handshaker* handshaker) { + handshaker->vtable->destroy(exec_ctx, handshaker); +} + +void grpc_handshaker_shutdown(grpc_exec_ctx* exec_ctx, + grpc_handshaker* handshaker, grpc_error* why) { + handshaker->vtable->shutdown(exec_ctx, handshaker, why); +} + +void grpc_handshaker_do_handshake(grpc_exec_ctx* exec_ctx, + grpc_handshaker* handshaker, + grpc_tcp_server_acceptor* acceptor, + grpc_closure* on_handshake_done, + grpc_handshaker_args* args) { + handshaker->vtable->do_handshake(exec_ctx, 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 == NULL); + GPR_ASSERT(mgr->next == NULL); + 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 != NULL) { + mgr->next->prev = mgr->prev; + } + if (mgr->prev != NULL) { + mgr->prev->next = mgr->next; + } else { + GPR_ASSERT(*head == mgr); + *head = mgr->next; + } +} + +void grpc_handshake_manager_pending_list_shutdown_all( + grpc_exec_ctx* exec_ctx, grpc_handshake_manager* head, grpc_error* why) { + while (head != NULL) { + grpc_handshake_manager_shutdown(exec_ctx, 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_exec_ctx* exec_ctx, + grpc_handshake_manager* mgr) { + if (gpr_unref(&mgr->refs)) { + for (size_t i = 0; i < mgr->count; ++i) { + grpc_handshaker_destroy(exec_ctx, mgr->handshakers[i]); + } + gpr_free(mgr->handshakers); + gpr_mu_destroy(&mgr->mu); + gpr_free(mgr); + } +} + +void grpc_handshake_manager_destroy(grpc_exec_ctx* exec_ctx, + grpc_handshake_manager* mgr) { + grpc_handshake_manager_unref(exec_ctx, mgr); +} + +void grpc_handshake_manager_shutdown(grpc_exec_ctx* exec_ctx, + 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(exec_ctx, 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_exec_ctx* exec_ctx, + 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(exec_ctx, &mgr->deadline_timer); + GRPC_CLOSURE_SCHED(exec_ctx, &mgr->on_handshake_done, error); + mgr->shutdown = true; + } else { + grpc_handshaker_do_handshake(exec_ctx, 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(grpc_exec_ctx* exec_ctx, void* arg, + grpc_error* error) { + grpc_handshake_manager* mgr = (grpc_handshake_manager*)arg; + gpr_mu_lock(&mgr->mu); + bool done = call_next_handshaker_locked(exec_ctx, 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(exec_ctx, mgr); + } +} + +// Callback invoked when deadline is exceeded. +static void on_timeout(grpc_exec_ctx* exec_ctx, 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( + exec_ctx, mgr, + GRPC_ERROR_CREATE_FROM_STATIC_STRING("Handshake timed out")); + } + grpc_handshake_manager_unref(exec_ctx, mgr); +} + +void grpc_handshake_manager_do_handshake( + grpc_exec_ctx* exec_ctx, grpc_handshake_manager* mgr, + grpc_endpoint* endpoint, const grpc_channel_args* channel_args, + gpr_timespec 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.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(exec_ctx, &mgr->deadline_timer, + gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), + &mgr->on_timeout, gpr_now(GPR_CLOCK_MONOTONIC)); + // Start first handshaker, which also owns a ref. + gpr_ref(&mgr->refs); + bool done = call_next_handshaker_locked(exec_ctx, mgr, GRPC_ERROR_NONE); + gpr_mu_unlock(&mgr->mu); + if (done) { + grpc_handshake_manager_unref(exec_ctx, mgr); + } +} |