| // |
| // Copyright 2018 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/client_channel/retry_service_config.h" |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "absl/strings/str_cat.h" |
| #include "absl/types/optional.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| |
| #include "src/core/ext/filters/client_channel/client_channel.h" |
| #include "src/core/ext/filters/client_channel/lb_policy_registry.h" |
| #include "src/core/ext/filters/client_channel/server_address.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/gprpp/memory.h" |
| #include "src/core/lib/json/json_util.h" |
| #include "src/core/lib/uri/uri_parser.h" |
| |
| // As per the retry design, we do not allow more than 5 retry attempts. |
| #define MAX_MAX_RETRY_ATTEMPTS 5 |
| |
| namespace grpc_core { |
| namespace internal { |
| |
| namespace { |
| size_t g_retry_service_config_parser_index; |
| } |
| |
| size_t RetryServiceConfigParser::ParserIndex() { |
| return g_retry_service_config_parser_index; |
| } |
| |
| void RetryServiceConfigParser::Register() { |
| g_retry_service_config_parser_index = ServiceConfigParser::RegisterParser( |
| absl::make_unique<RetryServiceConfigParser>()); |
| } |
| |
| namespace { |
| |
| grpc_error_handle ParseRetryThrottling(const Json& json, |
| intptr_t* max_milli_tokens, |
| intptr_t* milli_token_ratio) { |
| if (json.type() != Json::Type::OBJECT) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling error:Type should be object"); |
| } |
| std::vector<grpc_error_handle> error_list; |
| // Parse maxTokens. |
| auto it = json.object_value().find("maxTokens"); |
| if (it == json.object_value().end()) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:maxTokens error:Not found")); |
| } else if (it->second.type() != Json::Type::NUMBER) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:maxTokens error:Type should be " |
| "number")); |
| } else { |
| *max_milli_tokens = |
| gpr_parse_nonnegative_int(it->second.string_value().c_str()) * 1000; |
| if (*max_milli_tokens <= 0) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:maxTokens error:should be " |
| "greater than zero")); |
| } |
| } |
| // Parse tokenRatio. |
| it = json.object_value().find("tokenRatio"); |
| if (it == json.object_value().end()) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:tokenRatio error:Not found")); |
| } else if (it->second.type() != Json::Type::NUMBER) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:tokenRatio error:type should be " |
| "number")); |
| } else { |
| // We support up to 3 decimal digits. |
| size_t whole_len = it->second.string_value().size(); |
| const char* value = it->second.string_value().c_str(); |
| uint32_t multiplier = 1; |
| uint32_t decimal_value = 0; |
| const char* decimal_point = strchr(value, '.'); |
| if (decimal_point != nullptr) { |
| whole_len = static_cast<size_t>(decimal_point - value); |
| multiplier = 1000; |
| size_t decimal_len = strlen(decimal_point + 1); |
| if (decimal_len > 3) decimal_len = 3; |
| if (!gpr_parse_bytes_to_uint32(decimal_point + 1, decimal_len, |
| &decimal_value)) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:tokenRatio error:Failed " |
| "parsing")); |
| return GRPC_ERROR_CREATE_FROM_VECTOR("retryThrottling", &error_list); |
| } |
| uint32_t decimal_multiplier = 1; |
| for (size_t i = 0; i < (3 - decimal_len); ++i) { |
| decimal_multiplier *= 10; |
| } |
| decimal_value *= decimal_multiplier; |
| } |
| uint32_t whole_value; |
| if (!gpr_parse_bytes_to_uint32(value, whole_len, &whole_value)) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:tokenRatio error:Failed " |
| "parsing")); |
| return GRPC_ERROR_CREATE_FROM_VECTOR("retryThrottling", &error_list); |
| } |
| *milli_token_ratio = |
| static_cast<int>((whole_value * multiplier) + decimal_value); |
| if (*milli_token_ratio <= 0) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryThrottling field:tokenRatio error:value should " |
| "be greater than 0")); |
| } |
| } |
| return GRPC_ERROR_CREATE_FROM_VECTOR("retryThrottling", &error_list); |
| } |
| |
| } // namespace |
| |
| std::unique_ptr<ServiceConfigParser::ParsedConfig> |
| RetryServiceConfigParser::ParseGlobalParams(const grpc_channel_args* /*args*/, |
| const Json& json, |
| grpc_error_handle* error) { |
| GPR_DEBUG_ASSERT(error != nullptr && *error == GRPC_ERROR_NONE); |
| auto it = json.object_value().find("retryThrottling"); |
| if (it == json.object_value().end()) return nullptr; |
| intptr_t max_milli_tokens = 0; |
| intptr_t milli_token_ratio = 0; |
| *error = |
| ParseRetryThrottling(it->second, &max_milli_tokens, &milli_token_ratio); |
| if (*error != GRPC_ERROR_NONE) return nullptr; |
| return absl::make_unique<RetryGlobalConfig>(max_milli_tokens, |
| milli_token_ratio); |
| } |
| |
| namespace { |
| |
| grpc_error_handle ParseRetryPolicy(const Json& json, int* max_attempts, |
| grpc_millis* initial_backoff, |
| grpc_millis* max_backoff, |
| float* backoff_multiplier, |
| StatusCodeSet* retryable_status_codes) { |
| if (json.type() != Json::Type::OBJECT) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryPolicy error:should be of type object"); |
| } |
| std::vector<grpc_error_handle> error_list; |
| // Parse maxAttempts. |
| auto it = json.object_value().find("maxAttempts"); |
| if (it != json.object_value().end()) { |
| if (it->second.type() != Json::Type::NUMBER) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:maxAttempts error:should be of type number")); |
| } else { |
| *max_attempts = |
| gpr_parse_nonnegative_int(it->second.string_value().c_str()); |
| if (*max_attempts <= 1) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:maxAttempts error:should be at least 2")); |
| } else if (*max_attempts > MAX_MAX_RETRY_ATTEMPTS) { |
| gpr_log(GPR_ERROR, |
| "service config: clamped retryPolicy.maxAttempts at %d", |
| MAX_MAX_RETRY_ATTEMPTS); |
| *max_attempts = MAX_MAX_RETRY_ATTEMPTS; |
| } |
| } |
| } |
| // Parse initialBackoff. |
| if (ParseJsonObjectFieldAsDuration(json.object_value(), "initialBackoff", |
| initial_backoff, &error_list) && |
| *initial_backoff == 0) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:initialBackoff error:must be greater than 0")); |
| } |
| // Parse maxBackoff. |
| if (ParseJsonObjectFieldAsDuration(json.object_value(), "maxBackoff", |
| max_backoff, &error_list) && |
| *max_backoff == 0) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:maxBackoff error:should be greater than 0")); |
| } |
| // Parse backoffMultiplier. |
| it = json.object_value().find("backoffMultiplier"); |
| if (it != json.object_value().end()) { |
| if (it->second.type() != Json::Type::NUMBER) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:backoffMultiplier error:should be of type number")); |
| } else { |
| if (sscanf(it->second.string_value().c_str(), "%f", backoff_multiplier) != |
| 1) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:backoffMultiplier error:failed to parse")); |
| } else if (*backoff_multiplier <= 0) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:backoffMultiplier error:should be greater than 0")); |
| } |
| } |
| } |
| // Parse retryableStatusCodes. |
| it = json.object_value().find("retryableStatusCodes"); |
| if (it != json.object_value().end()) { |
| if (it->second.type() != Json::Type::ARRAY) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryableStatusCodes error:should be of type array")); |
| } else { |
| for (const Json& element : it->second.array_value()) { |
| if (element.type() != Json::Type::STRING) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryableStatusCodes error:status codes should be of type " |
| "string")); |
| continue; |
| } |
| grpc_status_code status; |
| if (!grpc_status_code_from_string(element.string_value().c_str(), |
| &status)) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryableStatusCodes error:failed to parse status code")); |
| continue; |
| } |
| retryable_status_codes->Add(status); |
| } |
| if (retryable_status_codes->Empty()) { |
| error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryableStatusCodes error:should be non-empty")); |
| }; |
| } |
| } |
| // Make sure required fields are set. |
| if (error_list.empty()) { |
| if (*max_attempts == 0 || *initial_backoff == 0 || *max_backoff == 0 || |
| *backoff_multiplier == 0 || retryable_status_codes->Empty()) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "field:retryPolicy error:Missing required field(s)"); |
| } |
| } |
| return GRPC_ERROR_CREATE_FROM_VECTOR("retryPolicy", &error_list); |
| } |
| |
| } // namespace |
| |
| std::unique_ptr<ServiceConfigParser::ParsedConfig> |
| RetryServiceConfigParser::ParsePerMethodParams( |
| const grpc_channel_args* /*args*/, const Json& json, |
| grpc_error_handle* error) { |
| GPR_DEBUG_ASSERT(error != nullptr && *error == GRPC_ERROR_NONE); |
| // Parse retry policy. |
| auto it = json.object_value().find("retryPolicy"); |
| if (it == json.object_value().end()) return nullptr; |
| int max_attempts = 0; |
| grpc_millis initial_backoff = 0; |
| grpc_millis max_backoff = 0; |
| float backoff_multiplier = 0; |
| StatusCodeSet retryable_status_codes; |
| *error = ParseRetryPolicy(it->second, &max_attempts, &initial_backoff, |
| &max_backoff, &backoff_multiplier, |
| &retryable_status_codes); |
| if (*error != GRPC_ERROR_NONE) return nullptr; |
| return absl::make_unique<RetryMethodConfig>(max_attempts, initial_backoff, |
| max_backoff, backoff_multiplier, |
| retryable_status_codes); |
| } |
| |
| } // namespace internal |
| } // namespace grpc_core |