1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_UTILS_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_UTILS_H_ 19 20 #include <cstdint> 21 #include <optional> 22 #include <string> 23 24 #include "perfetto/base/build_config.h" 25 #include "perfetto/ext/base/string_view.h" 26 #include "src/trace_processor/importers/common/args_tracker.h" 27 #include "src/trace_processor/storage/trace_storage.h" 28 29 #if PERFETTO_BUILDFLAG(PERFETTO_TP_JSON) 30 #include <json/value.h> 31 #else 32 namespace Json { 33 class Value {}; 34 } // namespace Json 35 #endif 36 37 namespace perfetto::trace_processor::json { 38 39 // Returns whether JSON related functioanlity is supported with the current 40 // build flags. IsJsonSupported()41constexpr bool IsJsonSupported() { 42 #if PERFETTO_BUILDFLAG(PERFETTO_TP_JSON) 43 return true; 44 #else 45 return false; 46 #endif 47 } 48 49 std::optional<int64_t> CoerceToTs(const Json::Value& value); 50 std::optional<int64_t> CoerceToTs(const std::string& value); 51 std::optional<int64_t> CoerceToInt64(const Json::Value& value); 52 std::optional<uint32_t> CoerceToUint32(const Json::Value& value); 53 54 // Parses the given JSON string into a JSON::Value object. 55 // This function should only be called if |IsJsonSupported()| returns true. 56 std::optional<Json::Value> ParseJsonString(base::StringView raw_string); 57 58 // Flattens the given Json::Value and adds each leaf node to the bound args 59 // inserter. Note: 60 // * |flat_key| and |key| should be non-empty and will be used to prefix the 61 // keys of all leaf nodes in the JSON. 62 // * |storage| is used to intern all strings (e.g. keys and values). 63 // * This function should only be called if |IsJsonSupported()| returns true. 64 bool AddJsonValueToArgs(const Json::Value& value, 65 base::StringView flat_key, 66 base::StringView key, 67 TraceStorage* storage, 68 ArgsTracker::BoundInserter* inserter); 69 70 } // namespace perfetto::trace_processor::json 71 72 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_JSON_JSON_UTILS_H_ 73