| /* |
| * |
| * 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 "src/core/lib/iomgr/sockaddr.h" |
| |
| #include "test/core/util/passthru_endpoint.h" |
| |
| #include <inttypes.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/useful.h> |
| #include "src/core/lib/slice/slice_internal.h" |
| |
| #define WRITE_BUFFER_SIZE (2 * 1024 * 1024) |
| |
| typedef struct { |
| grpc_endpoint base; |
| double bytes_per_second; |
| grpc_endpoint* wrapped; |
| gpr_timespec last_write; |
| |
| gpr_mu mu; |
| grpc_slice_buffer write_buffer; |
| grpc_slice_buffer writing_buffer; |
| grpc_error* error; |
| bool writing; |
| grpc_closure* write_cb; |
| } trickle_endpoint; |
| |
| static void te_read(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep, |
| grpc_slice_buffer* slices, grpc_closure* cb) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| grpc_endpoint_read(exec_ctx, te->wrapped, slices, cb); |
| } |
| |
| static void maybe_call_write_cb_locked(grpc_exec_ctx* exec_ctx, |
| trickle_endpoint* te) { |
| if (te->write_cb != nullptr && |
| (te->error != GRPC_ERROR_NONE || |
| te->write_buffer.length <= WRITE_BUFFER_SIZE)) { |
| GRPC_CLOSURE_SCHED(exec_ctx, te->write_cb, GRPC_ERROR_REF(te->error)); |
| te->write_cb = nullptr; |
| } |
| } |
| |
| static void te_write(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep, |
| grpc_slice_buffer* slices, grpc_closure* cb) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| gpr_mu_lock(&te->mu); |
| GPR_ASSERT(te->write_cb == nullptr); |
| if (te->write_buffer.length == 0) { |
| te->last_write = gpr_now(GPR_CLOCK_MONOTONIC); |
| } |
| for (size_t i = 0; i < slices->count; i++) { |
| grpc_slice_buffer_add(&te->write_buffer, |
| grpc_slice_copy(slices->slices[i])); |
| } |
| te->write_cb = cb; |
| maybe_call_write_cb_locked(exec_ctx, te); |
| gpr_mu_unlock(&te->mu); |
| } |
| |
| static void te_add_to_pollset(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep, |
| grpc_pollset* pollset) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| grpc_endpoint_add_to_pollset(exec_ctx, te->wrapped, pollset); |
| } |
| |
| static void te_add_to_pollset_set(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep, |
| grpc_pollset_set* pollset_set) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| grpc_endpoint_add_to_pollset_set(exec_ctx, te->wrapped, pollset_set); |
| } |
| |
| static void te_delete_from_pollset_set(grpc_exec_ctx* exec_ctx, |
| grpc_endpoint* ep, |
| grpc_pollset_set* pollset_set) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| grpc_endpoint_delete_from_pollset_set(exec_ctx, te->wrapped, pollset_set); |
| } |
| |
| static void te_shutdown(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep, |
| grpc_error* why) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| gpr_mu_lock(&te->mu); |
| if (te->error == GRPC_ERROR_NONE) { |
| te->error = GRPC_ERROR_REF(why); |
| } |
| maybe_call_write_cb_locked(exec_ctx, te); |
| gpr_mu_unlock(&te->mu); |
| grpc_endpoint_shutdown(exec_ctx, te->wrapped, why); |
| } |
| |
| static void te_destroy(grpc_exec_ctx* exec_ctx, grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| grpc_endpoint_destroy(exec_ctx, te->wrapped); |
| gpr_mu_destroy(&te->mu); |
| grpc_slice_buffer_destroy_internal(exec_ctx, &te->write_buffer); |
| grpc_slice_buffer_destroy_internal(exec_ctx, &te->writing_buffer); |
| GRPC_ERROR_UNREF(te->error); |
| gpr_free(te); |
| } |
| |
| static grpc_resource_user* te_get_resource_user(grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| return grpc_endpoint_get_resource_user(te->wrapped); |
| } |
| |
| static char* te_get_peer(grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| return grpc_endpoint_get_peer(te->wrapped); |
| } |
| |
| static int te_get_fd(grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| return grpc_endpoint_get_fd(te->wrapped); |
| } |
| |
| static void te_finish_write(grpc_exec_ctx* exec_ctx, void* arg, |
| grpc_error* error) { |
| trickle_endpoint* te = (trickle_endpoint*)arg; |
| gpr_mu_lock(&te->mu); |
| te->writing = false; |
| grpc_slice_buffer_reset_and_unref(&te->writing_buffer); |
| gpr_mu_unlock(&te->mu); |
| } |
| |
| static const grpc_endpoint_vtable vtable = {te_read, |
| te_write, |
| te_add_to_pollset, |
| te_add_to_pollset_set, |
| te_delete_from_pollset_set, |
| te_shutdown, |
| te_destroy, |
| te_get_resource_user, |
| te_get_peer, |
| te_get_fd}; |
| |
| grpc_endpoint* grpc_trickle_endpoint_create(grpc_endpoint* wrap, |
| double bytes_per_second) { |
| trickle_endpoint* te = (trickle_endpoint*)gpr_malloc(sizeof(*te)); |
| te->base.vtable = &vtable; |
| te->wrapped = wrap; |
| te->bytes_per_second = bytes_per_second; |
| te->write_cb = nullptr; |
| gpr_mu_init(&te->mu); |
| grpc_slice_buffer_init(&te->write_buffer); |
| grpc_slice_buffer_init(&te->writing_buffer); |
| te->error = GRPC_ERROR_NONE; |
| te->writing = false; |
| return &te->base; |
| } |
| |
| static double ts2dbl(gpr_timespec s) { |
| return (double)s.tv_sec + 1e-9 * (double)s.tv_nsec; |
| } |
| |
| size_t grpc_trickle_endpoint_trickle(grpc_exec_ctx* exec_ctx, |
| grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| gpr_mu_lock(&te->mu); |
| if (!te->writing && te->write_buffer.length > 0) { |
| gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); |
| double elapsed = ts2dbl(gpr_time_sub(now, te->last_write)); |
| size_t bytes = (size_t)(te->bytes_per_second * elapsed); |
| // gpr_log(GPR_DEBUG, "%lf elapsed --> %" PRIdPTR " bytes", elapsed, bytes); |
| if (bytes > 0) { |
| grpc_slice_buffer_move_first(&te->write_buffer, |
| GPR_MIN(bytes, te->write_buffer.length), |
| &te->writing_buffer); |
| te->writing = true; |
| te->last_write = now; |
| grpc_endpoint_write( |
| exec_ctx, te->wrapped, &te->writing_buffer, |
| GRPC_CLOSURE_CREATE(te_finish_write, te, grpc_schedule_on_exec_ctx)); |
| maybe_call_write_cb_locked(exec_ctx, te); |
| } |
| } |
| size_t backlog = te->write_buffer.length; |
| gpr_mu_unlock(&te->mu); |
| return backlog; |
| } |
| |
| size_t grpc_trickle_get_backlog(grpc_endpoint* ep) { |
| trickle_endpoint* te = (trickle_endpoint*)ep; |
| gpr_mu_lock(&te->mu); |
| size_t backlog = te->write_buffer.length; |
| gpr_mu_unlock(&te->mu); |
| return backlog; |
| } |