| /* |
| * |
| * 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 { |
| /* The first pass counts the number of servers in the server list. The second |
| * one allocates and decodes. */ |
| bool first_pass; |
| /* The decoding callback is invoked once per server in serverlist. Remember |
| * which index of the serverlist are we currently decoding */ |
| size_t decoding_idx; |
| /* Populated after the first pass. Number of server in the input serverlist */ |
| size_t num_servers; |
| /* The decoded serverlist */ |
| 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) { /* count how many server do we have */ |
| grpc_grpclb_server server; |
| if (!pb_decode(stream, grpc_lb_v1_Server_fields, &server)) { |
| gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(stream)); |
| return false; |
| } |
| dec_arg->num_servers++; |
| } else { /* second pass. Actually decode. */ |
| grpc_grpclb_server *server = gpr_malloc(sizeof(grpc_grpclb_server)); |
| memset(server, 0, sizeof(grpc_grpclb_server)); |
| GPR_ASSERT(dec_arg->num_servers > 0); |
| if (dec_arg->decoding_idx == 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_v1_Server_fields, server)) { |
| gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(stream)); |
| return false; |
| } |
| dec_arg->servers[dec_arg->decoding_idx++] = 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_v1_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_v1_LoadBalanceRequest_fields, |
| request) != 0); |
| return slice; |
| } |
| |
| void grpc_grpclb_request_destroy(grpc_grpclb_request *request) { |
| gpr_free(request); |
| } |
| |
| typedef grpc_lb_v1_LoadBalanceResponse grpc_grpclb_response; |
| grpc_grpclb_initial_response *grpc_grpclb_initial_response_parse( |
| gpr_slice encoded_grpc_grpclb_response) { |
| pb_istream_t stream = |
| pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_grpc_grpclb_response), |
| GPR_SLICE_LENGTH(encoded_grpc_grpclb_response)); |
| grpc_grpclb_response res; |
| memset(&res, 0, sizeof(grpc_grpclb_response)); |
| if (!pb_decode(&stream, grpc_lb_v1_LoadBalanceResponse_fields, &res)) { |
| gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream)); |
| return NULL; |
| } |
| grpc_grpclb_initial_response *initial_res = |
| gpr_malloc(sizeof(grpc_grpclb_initial_response)); |
| memcpy(initial_res, &res.initial_response, |
| sizeof(grpc_grpclb_initial_response)); |
| |
| return initial_res; |
| } |
| |
| grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist( |
| gpr_slice encoded_grpc_grpclb_response) { |
| bool status; |
| decode_serverlist_arg arg; |
| pb_istream_t stream = |
| pb_istream_from_buffer(GPR_SLICE_START_PTR(encoded_grpc_grpclb_response), |
| GPR_SLICE_LENGTH(encoded_grpc_grpclb_response)); |
| pb_istream_t stream_at_start = stream; |
| grpc_grpclb_response res; |
| memset(&res, 0, sizeof(grpc_grpclb_response)); |
| memset(&arg, 0, sizeof(decode_serverlist_arg)); |
| |
| res.server_list.servers.funcs.decode = decode_serverlist; |
| res.server_list.servers.arg = &arg; |
| arg.first_pass = true; |
| status = pb_decode(&stream, grpc_lb_v1_LoadBalanceResponse_fields, &res); |
| if (!status) { |
| gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream)); |
| return NULL; |
| } |
| |
| arg.first_pass = false; |
| status = |
| pb_decode(&stream_at_start, grpc_lb_v1_LoadBalanceResponse_fields, &res); |
| if (!status) { |
| gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream)); |
| return NULL; |
| } |
| |
| grpc_grpclb_serverlist *sl = gpr_malloc(sizeof(grpc_grpclb_serverlist)); |
| memset(sl, 0, sizeof(*sl)); |
| 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; |
| } |
| 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); |
| } |
| |
| grpc_grpclb_serverlist *grpc_grpclb_serverlist_copy( |
| const grpc_grpclb_serverlist *sl) { |
| grpc_grpclb_serverlist *copy = gpr_malloc(sizeof(grpc_grpclb_serverlist)); |
| memset(copy, 0, sizeof(grpc_grpclb_serverlist)); |
| copy->num_servers = sl->num_servers; |
| memcpy(©->expiration_interval, &sl->expiration_interval, |
| sizeof(grpc_grpclb_duration)); |
| copy->servers = gpr_malloc(sizeof(grpc_grpclb_server *) * sl->num_servers); |
| for (size_t i = 0; i < sl->num_servers; i++) { |
| copy->servers[i] = gpr_malloc(sizeof(grpc_grpclb_server)); |
| memcpy(copy->servers[i], sl->servers[i], sizeof(grpc_grpclb_server)); |
| } |
| return copy; |
| } |
| |
| bool grpc_grpclb_serverlist_equals(const grpc_grpclb_serverlist *lhs, |
| const grpc_grpclb_serverlist *rhs) { |
| if ((lhs == NULL) || (rhs == NULL)) { |
| return false; |
| } |
| if (lhs->num_servers != rhs->num_servers) { |
| return false; |
| } |
| if (grpc_grpclb_duration_compare(&lhs->expiration_interval, |
| &rhs->expiration_interval) != 0) { |
| return false; |
| } |
| for (size_t i = 0; i < lhs->num_servers; i++) { |
| if (!grpc_grpclb_server_equals(lhs->servers[i], rhs->servers[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool grpc_grpclb_server_equals(const grpc_grpclb_server *lhs, |
| const grpc_grpclb_server *rhs) { |
| return memcmp(lhs, rhs, sizeof(grpc_grpclb_server)) == 0; |
| } |
| |
| int grpc_grpclb_duration_compare(const grpc_grpclb_duration *lhs, |
| const grpc_grpclb_duration *rhs) { |
| GPR_ASSERT(lhs && rhs); |
| if (lhs->has_seconds && rhs->has_seconds) { |
| if (lhs->seconds < rhs->seconds) return -1; |
| if (lhs->seconds > rhs->seconds) return 1; |
| } else if (lhs->has_seconds) { |
| return 1; |
| } else if (rhs->has_seconds) { |
| return -1; |
| } |
| |
| GPR_ASSERT(lhs->seconds == rhs->seconds); |
| if (lhs->has_nanos && rhs->has_nanos) { |
| if (lhs->nanos < rhs->nanos) return -1; |
| if (lhs->nanos > rhs->nanos) return 1; |
| } else if (lhs->has_nanos) { |
| return 1; |
| } else if (rhs->has_nanos) { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| void grpc_grpclb_initial_response_destroy( |
| grpc_grpclb_initial_response *response) { |
| gpr_free(response); |
| } |