ceph/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/TraceID.cpp

   1 /*
   2  * Copyright (c) 2017 Uber Technologies, Inc.
   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 #include "jaegertracing/TraceID.h"
  18 #include "jaegertracing/utils/HexParsing.h"
  19 #include <iterator>
  20 #include <stddef.h>
  21 #include <string>
  22
  23 namespace jaegertracing {
  24
  25 TraceID TraceID::fromStream(std::istream& in)
  26 {
  27     TraceID traceID;
  28     constexpr auto kMaxChars = static_cast<size_t>(32);
  29     auto buffer = utils::HexParsing::readSegment(in, kMaxChars, ':');
  30
  31     if (buffer.empty()) {
  32         return TraceID();
  33     }
  34
  35     if (buffer.size() < kMaxChars / 2) {
  36         traceID._low = utils::HexParsing::decodeHex<uint64_t>(buffer);
  37     }
  38     else {
  39         auto beginLowStr = std::end(buffer) - kMaxChars / 2;
  40         const std::string highStr(std::begin(buffer), beginLowStr);
  41         traceID._high = utils::HexParsing::decodeHex<uint64_t>(highStr);
  42         const std::string lowStr(beginLowStr, std::end(buffer));
  43         traceID._low = utils::HexParsing::decodeHex<uint64_t>(lowStr);
  44     }
  45
  46     return traceID;
  47 }
  48
  49 }  // namespace jaegertracing