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//
// Copyright 2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#include "src/core/lib/channel/message_size_filter.h"
#include <limits.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/channel/channel_args.h"
// The protobuf library will (by default) start warning at 100 megs.
#define DEFAULT_MAX_MESSAGE_LENGTH (4 * 1024 * 1024)
typedef struct call_data {
// Receive closures are chained: we inject this closure as the
// recv_message_ready up-call on transport_stream_op, and remember to
// call our next_recv_message_ready member after handling it.
grpc_closure recv_message_ready;
// Used by recv_message_ready.
grpc_byte_stream** recv_message;
// Original recv_message_ready callback, invoked after our own.
grpc_closure* next_recv_message_ready;
} call_data;
typedef struct channel_data {
size_t max_send_size;
size_t max_recv_size;
} channel_data;
// Callback invoked when we receive a message. Here we check the max
// receive message size.
static void recv_message_ready(grpc_exec_ctx* exec_ctx, void* user_data,
grpc_error* error) {
grpc_call_element* elem = user_data;
call_data* calld = elem->call_data;
channel_data* chand = elem->channel_data;
if (*calld->recv_message != NULL &&
(*calld->recv_message)->length > chand->max_recv_size) {
char* message_string;
gpr_asprintf(
&message_string, "Received message larger than max (%u vs. %lu)",
(*calld->recv_message)->length, (unsigned long)chand->max_recv_size);
gpr_slice message = gpr_slice_from_copied_string(message_string);
gpr_free(message_string);
grpc_call_element_send_cancel_with_message(
exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT, &message);
}
// Invoke the next callback.
grpc_exec_ctx_sched(exec_ctx, calld->next_recv_message_ready, error, NULL);
}
// Start transport op.
static void start_transport_stream_op(grpc_exec_ctx* exec_ctx,
grpc_call_element* elem,
grpc_transport_stream_op* op) {
call_data* calld = elem->call_data;
channel_data* chand = elem->channel_data;
// Check max send message size.
if (op->send_message != NULL &&
op->send_message->length > chand->max_send_size) {
char* message_string;
gpr_asprintf(&message_string, "Sent message larger than max (%u vs. %lu)",
op->send_message->length, (unsigned long)chand->max_send_size);
gpr_slice message = gpr_slice_from_copied_string(message_string);
gpr_free(message_string);
grpc_call_element_send_cancel_with_message(
exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT, &message);
}
// Inject callback for receiving a message.
if (op->recv_message_ready != NULL) {
calld->next_recv_message_ready = op->recv_message_ready;
calld->recv_message = op->recv_message;
op->recv_message_ready = &calld->recv_message_ready;
}
// Chain to the next filter.
grpc_call_next_op(exec_ctx, elem, op);
}
// Constructor for call_data.
static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
grpc_call_element* elem,
grpc_call_element_args* args) {
call_data* calld = elem->call_data;
calld->next_recv_message_ready = NULL;
grpc_closure_init(&calld->recv_message_ready, recv_message_ready, elem);
return GRPC_ERROR_NONE;
}
// Destructor for call_data.
static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
const grpc_call_final_info* final_info,
void* ignored) {}
// Constructor for channel_data.
static void init_channel_elem(grpc_exec_ctx* exec_ctx,
grpc_channel_element* elem,
grpc_channel_element_args* args) {
GPR_ASSERT(!args->is_last);
channel_data* chand = elem->channel_data;
memset(chand, 0, sizeof(*chand));
chand->max_send_size = DEFAULT_MAX_MESSAGE_LENGTH;
chand->max_recv_size = DEFAULT_MAX_MESSAGE_LENGTH;
const grpc_integer_options options = {DEFAULT_MAX_MESSAGE_LENGTH, 0, INT_MAX};
for (size_t i = 0; i < args->channel_args->num_args; ++i) {
if (strcmp(args->channel_args->args[i].key,
GRPC_ARG_MAX_SEND_MESSAGE_LENGTH) == 0) {
chand->max_send_size = (size_t)grpc_channel_arg_get_integer(
&args->channel_args->args[i], options);
}
if (strcmp(args->channel_args->args[i].key,
GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH) == 0) {
chand->max_recv_size = (size_t)grpc_channel_arg_get_integer(
&args->channel_args->args[i], options);
}
}
}
// Destructor for channel_data.
static void destroy_channel_elem(grpc_exec_ctx* exec_ctx,
grpc_channel_element* elem) {}
const grpc_channel_filter grpc_message_size_filter = {
start_transport_stream_op,
grpc_channel_next_op,
sizeof(call_data),
init_call_elem,
grpc_call_stack_ignore_set_pollset_or_pollset_set,
destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"message_size"};
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