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/*
*
* 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 != NULL && (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 = NULL;
}
}
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 == NULL);
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_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_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 = NULL;
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;
}
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