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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/ext/lb_policy/grpclb/load_balancer_api.h"
#include "third_party/nanopb/pb_decode.h"
#include "third_party/nanopb/pb_encode.h"
#include <grpc/support/alloc.h>
typedef struct decode_serverlist_arg {
int first_pass;
int i;
size_t num_servers;
grpc_grpclb_server **servers;
} decode_serverlist_arg;
/* invoked once for every Server in ServerList */
static bool decode_serverlist(pb_istream_t *stream, const pb_field_t *field,
void **arg) {
decode_serverlist_arg *dec_arg = *arg;
if (dec_arg->first_pass != 0) { /* first pass */
grpc_grpclb_server server;
if (!pb_decode(stream, grpc_lb_v0_Server_fields, &server)) {
return false;
}
dec_arg->num_servers++;
} else { /* second pass */
grpc_grpclb_server *server = gpr_malloc(sizeof(grpc_grpclb_server));
GPR_ASSERT(dec_arg->num_servers > 0);
if (dec_arg->i == 0) { /* first iteration of second pass */
dec_arg->servers =
gpr_malloc(sizeof(grpc_grpclb_server *) * dec_arg->num_servers);
}
if (!pb_decode(stream, grpc_lb_v0_Server_fields, server)) {
return false;
}
dec_arg->servers[dec_arg->i++] = server;
}
return true;
}
grpc_grpclb_request *grpc_grpclb_request_create(const char *lb_service_name) {
grpc_grpclb_request *req = gpr_malloc(sizeof(grpc_grpclb_request));
req->has_client_stats = 0; /* TODO(dgq): add support for stats once defined */
req->has_initial_request = 1;
req->initial_request.has_name = 1;
strncpy(req->initial_request.name, lb_service_name,
GRPC_GRPCLB_SERVICE_NAME_MAX_LENGTH);
return req;
}
gpr_slice grpc_grpclb_request_encode(const grpc_grpclb_request *request) {
size_t encoded_length;
pb_ostream_t sizestream;
pb_ostream_t outputstream;
gpr_slice slice;
memset(&sizestream, 0, sizeof(pb_ostream_t));
pb_encode(&sizestream, grpc_lb_v0_LoadBalanceRequest_fields, request);
encoded_length = sizestream.bytes_written;
slice = gpr_slice_malloc(encoded_length);
outputstream =
pb_ostream_from_buffer(GPR_SLICE_START_PTR(slice), encoded_length);
GPR_ASSERT(pb_encode(&outputstream, grpc_lb_v0_LoadBalanceRequest_fields,
request) != 0);
return slice;
}
void grpc_grpclb_request_destroy(grpc_grpclb_request *request) {
gpr_free(request);
}
grpc_grpclb_response *grpc_grpclb_response_parse(gpr_slice encoded_response) {
bool status;
pb_istream_t stream =
pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_response),
GPR_SLICE_LENGTH(encoded_response));
grpc_grpclb_response *res = gpr_malloc(sizeof(grpc_grpclb_response));
memset(res, 0, sizeof(*res));
status = pb_decode(&stream, grpc_lb_v0_LoadBalanceResponse_fields, res);
if (!status) {
grpc_grpclb_response_destroy(res);
return NULL;
}
return res;
}
grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
gpr_slice encoded_response) {
bool status;
decode_serverlist_arg arg;
pb_istream_t stream =
pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_response),
GPR_SLICE_LENGTH(encoded_response));
pb_istream_t stream_at_start = stream;
grpc_grpclb_response *res = gpr_malloc(sizeof(grpc_grpclb_response));
memset(res, 0, sizeof(*res));
memset(&arg, 0, sizeof(decode_serverlist_arg));
res->server_list.servers.funcs.decode = decode_serverlist;
res->server_list.servers.arg = &arg;
arg.first_pass = 1;
status = pb_decode(&stream, grpc_lb_v0_LoadBalanceResponse_fields, res);
if (!status) {
grpc_grpclb_response_destroy(res);
return NULL;
}
arg.first_pass = 0;
status =
pb_decode(&stream_at_start, grpc_lb_v0_LoadBalanceResponse_fields, res);
if (!status) {
grpc_grpclb_response_destroy(res);
return NULL;
}
grpc_grpclb_serverlist *sl = gpr_malloc(sizeof(grpc_grpclb_serverlist));
sl->num_servers = arg.num_servers;
sl->servers = arg.servers;
if (res->server_list.has_expiration_interval) {
sl->expiration_interval = res->server_list.expiration_interval;
}
grpc_grpclb_response_destroy(res);
return sl;
}
void grpc_grpclb_destroy_serverlist(grpc_grpclb_serverlist *serverlist) {
if (serverlist == NULL) {
return;
}
for (size_t i = 0; i < serverlist->num_servers; i++) {
gpr_free(serverlist->servers[i]);
}
gpr_free(serverlist->servers);
gpr_free(serverlist);
}
void grpc_grpclb_response_destroy(grpc_grpclb_response *response) {
gpr_free(response);
}
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