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//
// Copyright 2021 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 <grpc/support/port_platform.h>
#include "src/core/ext/filters/fault_injection/service_config_parser.h"
#include <vector>
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "src/core/ext/filters/client_channel/service_config.h"
#include "src/core/ext/filters/fault_injection/fault_injection_filter.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/status_util.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/json/json_util.h"
namespace grpc_core {
namespace {
size_t g_fault_injection_parser_index;
std::vector<FaultInjectionMethodParsedConfig::FaultInjectionPolicy>
ParseFaultInjectionPolicy(const Json::Array& policies_json_array,
std::vector<grpc_error_handle>* error_list) {
std::vector<FaultInjectionMethodParsedConfig::FaultInjectionPolicy> policies;
for (size_t i = 0; i < policies_json_array.size(); i++) {
FaultInjectionMethodParsedConfig::FaultInjectionPolicy
fault_injection_policy;
std::vector<grpc_error_handle> sub_error_list;
if (policies_json_array[i].type() != Json::Type::OBJECT) {
error_list->push_back(GRPC_ERROR_CREATE_FROM_COPIED_STRING(
absl::StrCat("faultInjectionPolicy index ", i,
" is not a JSON object")
.c_str()));
continue;
}
const Json::Object& json_object = policies_json_array[i].object_value();
// Parse abort_code
std::string abort_code_string;
if (ParseJsonObjectField(json_object, "abortCode", &abort_code_string,
&sub_error_list, false)) {
if (!grpc_status_code_from_string(abort_code_string.c_str(),
&(fault_injection_policy.abort_code))) {
sub_error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"field:abortCode error:failed to parse status code"));
}
}
// Parse abort_message
if (!ParseJsonObjectField(json_object, "abortMessage",
&fault_injection_policy.abort_message,
&sub_error_list, false)) {
fault_injection_policy.abort_message = "Fault injected";
}
// Parse abort_code_header
ParseJsonObjectField(json_object, "abortCodeHeader",
&fault_injection_policy.abort_code_header,
&sub_error_list, false);
// Parse abort_percentage_header
ParseJsonObjectField(json_object, "abortPercentageHeader",
&fault_injection_policy.abort_percentage_header,
&sub_error_list, false);
// Parse abort_percentage_numerator
ParseJsonObjectField(json_object, "abortPercentageNumerator",
&fault_injection_policy.abort_percentage_numerator,
&sub_error_list, false);
// Parse abort_percentage_denominator
if (ParseJsonObjectField(
json_object, "abortPercentageDenominator",
&fault_injection_policy.abort_percentage_denominator,
&sub_error_list, false)) {
if (fault_injection_policy.abort_percentage_denominator != 100 &&
fault_injection_policy.abort_percentage_denominator != 10000 &&
fault_injection_policy.abort_percentage_denominator != 1000000) {
sub_error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"field:abortPercentageDenominator error:Denominator can only be "
"one of "
"100, 10000, 1000000"));
}
}
// Parse delay
ParseJsonObjectFieldAsDuration(json_object, "delay",
&fault_injection_policy.delay,
&sub_error_list, false);
// Parse delay_header
ParseJsonObjectField(json_object, "delayHeader",
&fault_injection_policy.delay_header, &sub_error_list,
false);
// Parse delay_percentage_header
ParseJsonObjectField(json_object, "delayPercentageHeader",
&fault_injection_policy.delay_percentage_header,
&sub_error_list, false);
// Parse delay_percentage_numerator
ParseJsonObjectField(json_object, "delayPercentageNumerator",
&fault_injection_policy.delay_percentage_numerator,
&sub_error_list, false);
// Parse delay_percentage_denominator
if (ParseJsonObjectField(
json_object, "delayPercentageDenominator",
&fault_injection_policy.delay_percentage_denominator,
&sub_error_list, false)) {
if (fault_injection_policy.delay_percentage_denominator != 100 &&
fault_injection_policy.delay_percentage_denominator != 10000 &&
fault_injection_policy.delay_percentage_denominator != 1000000) {
sub_error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"field:delayPercentageDenominator error:Denominator can only be "
"one of "
"100, 10000, 1000000"));
}
}
// Parse max_faults
if (ParseJsonObjectField(json_object, "maxFaults",
&fault_injection_policy.max_faults,
&sub_error_list, false)) {
if (fault_injection_policy.max_faults < 0) {
sub_error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"field:maxFaults error:should be zero or positive"));
}
}
if (!sub_error_list.empty()) {
// Can't use GRPC_ERROR_CREATE_FROM_VECTOR() here, because the error
// string is not static in this case.
grpc_error_handle error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(
absl::StrCat("failed to parse faultInjectionPolicy index ", i)
.c_str());
for (size_t i = 0; i < sub_error_list.size(); ++i) {
error = grpc_error_add_child(error, sub_error_list[i]);
}
error_list->push_back(error);
}
policies.push_back(std::move(fault_injection_policy));
}
return policies;
}
} // namespace
std::unique_ptr<ServiceConfigParser::ParsedConfig>
FaultInjectionServiceConfigParser::ParsePerMethodParams(
const grpc_channel_args* args, const Json& json, grpc_error_handle* error) {
GPR_DEBUG_ASSERT(error != nullptr && *error == GRPC_ERROR_NONE);
// Only parse fault injection policy if the following channel arg is present.
if (!grpc_channel_args_find_bool(
args, GRPC_ARG_PARSE_FAULT_INJECTION_METHOD_CONFIG, false)) {
return nullptr;
}
// Parse fault injection policy from given Json
std::vector<FaultInjectionMethodParsedConfig::FaultInjectionPolicy>
fault_injection_policies;
std::vector<grpc_error_handle> error_list;
const Json::Array* policies_json_array;
if (ParseJsonObjectField(json.object_value(), "faultInjectionPolicy",
&policies_json_array, &error_list)) {
fault_injection_policies =
ParseFaultInjectionPolicy(*policies_json_array, &error_list);
}
*error = GRPC_ERROR_CREATE_FROM_VECTOR("Fault injection parser", &error_list);
if (*error != GRPC_ERROR_NONE || fault_injection_policies.empty()) {
return nullptr;
}
return absl::make_unique<FaultInjectionMethodParsedConfig>(
std::move(fault_injection_policies));
}
void FaultInjectionServiceConfigParser::Register() {
g_fault_injection_parser_index = ServiceConfigParser::RegisterParser(
absl::make_unique<FaultInjectionServiceConfigParser>());
}
size_t FaultInjectionServiceConfigParser::ParserIndex() {
return g_fault_injection_parser_index;
}
} // namespace grpc_core
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