1 // 2 // 3 // Copyright 2020 gRPC authors. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 // 17 // 18 19 #include <grpc/support/port_platform.h> 20 21 #include "src/core/lib/json/json_util.h" 22 23 #include <grpc/support/string_util.h> 24 25 #include "src/core/lib/gpr/string.h" 26 27 namespace grpc_core { 28 ParseDurationFromJson(const Json & field,grpc_millis * duration)29bool ParseDurationFromJson(const Json& field, grpc_millis* duration) { 30 if (field.type() != Json::Type::STRING) return false; 31 size_t len = field.string_value().size(); 32 if (field.string_value()[len - 1] != 's') return false; 33 grpc_core::UniquePtr<char> buf(gpr_strdup(field.string_value().c_str())); 34 *(buf.get() + len - 1) = '\0'; // Remove trailing 's'. 35 char* decimal_point = strchr(buf.get(), '.'); 36 int nanos = 0; 37 if (decimal_point != nullptr) { 38 *decimal_point = '\0'; 39 nanos = gpr_parse_nonnegative_int(decimal_point + 1); 40 if (nanos == -1) { 41 return false; 42 } 43 int num_digits = static_cast<int>(strlen(decimal_point + 1)); 44 if (num_digits > 9) { // We don't accept greater precision than nanos. 45 return false; 46 } 47 for (int i = 0; i < (9 - num_digits); ++i) { 48 nanos *= 10; 49 } 50 } 51 int seconds = 52 decimal_point == buf.get() ? 0 : gpr_parse_nonnegative_int(buf.get()); 53 if (seconds == -1) return false; 54 *duration = seconds * GPR_MS_PER_SEC + nanos / GPR_NS_PER_MS; 55 return true; 56 } 57 58 } // namespace grpc_core 59