C++ dynamic::get_ptr方法代码示例

ProxyConfig::ProxyConfig(proxy_t* proxy,
                         const folly::dynamic& json,
                         std::string configMd5Digest,
                         std::shared_ptr<PoolFactory> poolFactory)
  : poolFactory_(std::move(poolFactory)),
    configMd5Digest_(std::move(configMd5Digest)) {

  McRouteHandleProvider provider(proxy, *proxy->destinationMap, *poolFactory_);
  RouteHandleFactory<McrouterRouteHandleIf> factory(provider);

  checkLogic(json.isObject(), "Config is not an object");

  if (json.count("named_handles")) {
    checkLogic(json["named_handles"].isArray(), "named_handles is not array");
    for (const auto& it : json["named_handles"]) {
      factory.create(it);
    }
  }

  RouteSelectorMap routeSelectors;

  auto jRoute = json.get_ptr("route");
  auto jRoutes = json.get_ptr("routes");
  checkLogic(!jRoute || !jRoutes,
             "Invalid config: both 'route' and 'routes' are specified");
  checkLogic(jRoute || jRoutes, "No route/routes in config");
  if (jRoute) {
    routeSelectors[proxy->getRouterOptions().default_route] =
        std::make_shared<PrefixSelectorRoute>(factory, *jRoute);
  } else { // jRoutes
    checkLogic(jRoutes->isArray() || jRoutes->isObject(),
               "Config: routes is not array/object");
    if (jRoutes->isArray()) {
      for (const auto& it : *jRoutes) {
        checkLogic(it.isObject(), "RoutePolicy is not an object");
        auto jCurRoute = it.get_ptr("route");
        auto jAliases = it.get_ptr("aliases");
        checkLogic(jCurRoute, "RoutePolicy: no route");
        checkLogic(jAliases, "RoutePolicy: no aliases");
        checkLogic(jAliases->isArray(), "RoutePolicy: aliases is not an array");
        auto routeSelector =
            std::make_shared<PrefixSelectorRoute>(factory, *jCurRoute);
        for (const auto& alias : *jAliases) {
          checkLogic(alias.isString(), "RoutePolicy: alias is not a string");
          routeSelectors[alias.stringPiece()] = routeSelector;
        }
      }
    } else { // object
      for (const auto& it : jRoutes->items()) {
        checkLogic(it.first.isString(), "RoutePolicy: alias is not a string");
        routeSelectors[it.first.stringPiece()] =
            std::make_shared<PrefixSelectorRoute>(factory, it.second);
      }
    }
  }

  asyncLogRoutes_ = provider.releaseAsyncLogRoutes();
  proxyRoute_ = std::make_shared<ProxyRoute>(proxy, routeSelectors);
  serviceInfo_ = std::make_shared<ServiceInfo>(proxy, *this);
}

void PoolFactory::parseQos(std::string parentName, const folly::dynamic& jQos,
                           uint64_t& qosClass, uint64_t& qosPath) {
  if (!jQos.isObject()) {
    MC_LOG_FAILURE(opts_, memcache::failure::Category::kInvalidConfig,
                   "{}: qos must be an object.", parentName);
    return;
  }

  uint64_t prevClass = qosClass;
  if (auto jClass = jQos.get_ptr("class")) {
    if (jClass->isInt() && isQosClassValid(jClass->getInt())) {
      qosClass = jClass->getInt();
    } else {
      MC_LOG_FAILURE(opts_, memcache::failure::Category::kInvalidConfig,
                     "{}: qos.class must be an integer in the range [0, 4]",
                     parentName);
    }
  }
  if (auto jPath = jQos.get_ptr("path")) {
    if (jPath->isInt() && isQosPathValid(jPath->getInt())) {
      qosPath = jPath->getInt();
    } else {
      MC_LOG_FAILURE(opts_, memcache::failure::Category::kInvalidConfig,
                     "{}: qos.path must be an integer in the range [0, 3]",
                     parentName);
      qosClass = prevClass;
    }
  }
}

McrouterRouteHandlePtr makeHashRoute(
  const folly::dynamic& json,
  std::vector<McrouterRouteHandlePtr> rh,
  size_t threadId) {

  std::string salt;
  folly::StringPiece funcType = Ch3HashFunc::type();
  if (json.isObject()) {
    if (auto jsalt = json.get_ptr("salt")) {
      checkLogic(jsalt->isString(), "HashRoute: salt is not a string");
      salt = jsalt->getString();
    }
    if (auto jhashFunc = json.get_ptr("hash_func")) {
      checkLogic(jhashFunc->isString(),
                 "HashRoute: hash_func is not a string");
      funcType = jhashFunc->stringPiece();
    }
  }

  if (funcType == Ch3HashFunc::type()) {
    return makeHashRouteCh3(std::move(rh), std::move(salt));
  } else if (funcType == Crc32HashFunc::type()) {
    return makeHashRouteCrc32(std::move(rh), std::move(salt));
  } else if (funcType == WeightedCh3HashFunc::type()) {
    WeightedCh3HashFunc func{json, rh.size()};
    return makeHashRouteWeightedCh3(std::move(rh), std::move(salt),
                                    std::move(func));
  } else if (funcType == ConstShardHashFunc::type()) {
    return makeHashRouteConstShard(std::move(rh), std::move(salt));
  } else if (funcType == "Latest") {
    return makeLatestRoute(json, std::move(rh), threadId);
  }
  throwLogic("Unknown hash function: {}", funcType);
}

McrouterRouteHandlePtr makeFailoverWithExptimeRoute(
    RouteHandleFactory<McrouterRouteHandleIf>& factory,
    const folly::dynamic& json) {
  checkLogic(json.isObject(), "FailoverWithExptimeRoute is not an object");
  auto jnormal = json.get_ptr("normal");
  checkLogic(jnormal, "FailoverWithExptimeRoute: normal not found");
  auto normal = factory.create(*jnormal);

  int32_t failoverExptime = 60;
  if (auto jexptime = json.get_ptr("failover_exptime")) {
    checkLogic(jexptime->isInt(), "FailoverWithExptimeRoute: "
                                  "failover_exptime is not an integer");
    failoverExptime = jexptime->getInt();
  }

  std::vector<McrouterRouteHandlePtr> failover;
  if (auto jfailover = json.get_ptr("failover")) {
    failover = factory.createList(*jfailover);
  }

  auto children = getFailoverChildren(std::move(normal),
                                      std::move(failover),
                                      failoverExptime);
  return makeFailoverRoute(json, std::move(children));
}

McrouterRouteHandlePtr makeRateLimitRoute(
    RouteHandleFactory<McrouterRouteHandleIf>& factory,
    const folly::dynamic& json) {
  checkLogic(json.isObject(), "RateLimitRoute is not an object");
  auto jtarget = json.get_ptr("target");
  checkLogic(jtarget, "RateLimitRoute: target not found");
  auto target = factory.create(*jtarget);
  auto jrates = json.get_ptr("rates");
  checkLogic(jrates, "RateLimitRoute: rates not found");
  return makeRateLimitRoute(std::move(target), RateLimiter(*jrates));
}

McrouterRouteHandlePtr makeLatestRoute(
  const folly::dynamic& json,
  std::vector<McrouterRouteHandlePtr> targets) {

  size_t failoverCount = 5;
  FailoverErrorsSettings failoverErrors;
  if (json.isObject()) {
    if (auto jfailoverCount = json.get_ptr("failover_count")) {
      checkLogic(jfailoverCount->isInt(),
                 "LatestRoute: failover_count is not an integer");
      failoverCount = jfailoverCount->getInt();
    }
    if (auto jFailoverErrors = json.get_ptr("failover_errors")) {
      failoverErrors = FailoverErrorsSettings(*jFailoverErrors);
    }
  }
  return makeLatestRoute(std::move(targets), failoverCount,
                         std::move(failoverErrors));
}

FailoverErrorsSettings::FailoverErrorsSettings(const folly::dynamic& json) {
  checkLogic(json.isObject() || json.isArray(),
      "Failover errors must be either an array or an object.");

  if (json.isObject()) {
    if (auto jsonGets = json.get_ptr("gets")) {
      gets_ = FailoverErrorsSettings::List(*jsonGets);
    }
    if (auto jsonUpdates = json.get_ptr("updates")) {
      updates_ = FailoverErrorsSettings::List(*jsonUpdates);
    }
    if (auto jsonDeletes = json.get_ptr("deletes")) {
      deletes_ = FailoverErrorsSettings::List(*jsonDeletes);
    }
  } else if (json.isArray()) {
    gets_ = FailoverErrorsSettings::List(json);
    updates_ = FailoverErrorsSettings::List(json);
    deletes_ = FailoverErrorsSettings::List(json);
  }
}

PoolFactory::PoolJson PoolFactory::parsePool(const folly::dynamic& json) {
  checkLogic(json.isString() || json.isObject(),
             "Pool should be a string (name of pool) or an object");
  if (json.isString()) {
    return parseNamedPool(json.stringPiece());
  }
  auto jname = json.get_ptr("name");
  checkLogic(jname && jname->isString(), "Pool should have string 'name'");
  pools_.emplace(jname->stringPiece(), std::make_pair(json, PoolState::NEW));
  return parseNamedPool(jname->stringPiece());
}

/**
 * @return target and asynclogName
 *         Caller may call makeAsynclogRoute afterwards.
 */
std::pair<McrouterRouteHandlePtr, std::string> parseAsynclogRoute(
    RouteHandleFactory<McrouterRouteHandleIf>& factory,
    const folly::dynamic& json) {
  std::string asynclogName;
  McrouterRouteHandlePtr target;
  checkLogic(json.isObject() || json.isString(),
             "AsynclogRoute should be object or string");
  if (json.isString()) {
    asynclogName = json.stringPiece().str();
    target = factory.create(json);
  } else { // object
    auto jname = json.get_ptr("name");
    checkLogic(jname && jname->isString(),
               "AsynclogRoute: required string name");
    auto jtarget = json.get_ptr("target");
    checkLogic(jtarget, "AsynclogRoute: target not found");
    asynclogName = jname->stringPiece().str();
    target = factory.create(*jtarget);
  }
  return { std::move(target), std::move(asynclogName) };
}

std::shared_ptr<ClientPool>
PoolFactory::parsePool(const folly::dynamic& json) {
  checkLogic(json.isString() || json.isObject(),
             "Pool should be a string (name of pool) or an object");
  if (json.isString()) {
    return parsePool(json.stringPiece().str(), json);
  } else {
    auto name = json.get_ptr("name");
    checkLogic(name && name->isString(), "Pool should have string 'name'");
    return parsePool(name->stringPiece().str(), json);
  }
}

PoolFactory::PoolFactory(const folly::dynamic& config, ConfigApiIf& configApi)
    : configApi_(configApi) {
  checkLogic(config.isObject(), "config is not an object");
  if (auto jpools = config.get_ptr("pools")) {
    checkLogic(jpools->isObject(), "config: 'pools' is not an object");

    for (const auto& it : jpools->items()) {
      pools_.emplace(
          it.first.stringPiece(), std::make_pair(it.second, PoolState::NEW));
    }
  }
}

std::shared_ptr<ShadowSettings>
ShadowSettings::create(const folly::dynamic& json, McrouterInstance& router) {
  auto result = std::shared_ptr<ShadowSettings>(new ShadowSettings());
  try {
    checkLogic(json.isObject(), "json is not an object");
    if (auto jKeyFractionRange = json.get_ptr("key_fraction_range")) {
      checkLogic(jKeyFractionRange->isArray(),
                 "key_fraction_range is not an array");
      auto ar = folly::convertTo<std::vector<double>>(*jKeyFractionRange);
      checkLogic(ar.size() == 2, "key_fraction_range size is not 2");
      result->setKeyRange(ar[0], ar[1]);
    }
    if (auto jIndexRange = json.get_ptr("index_range")) {
      checkLogic(jIndexRange->isArray(), "index_range is not an array");
      auto ar = folly::convertTo<std::vector<size_t>>(*jIndexRange);
      checkLogic(ar.size() == 2, "index_range size is not 2");
      checkLogic(ar[0] <= ar[1], "index_range start > end");
      result->startIndex_ = ar[0];
      result->endIndex_ = ar[1];
    }
    if (auto jKeyFractionRangeRv = json.get_ptr("key_fraction_range_rv")) {
      checkLogic(jKeyFractionRangeRv->isString(),
                 "key_fraction_range_rv is not a string");
      result->keyFractionRangeRv_ = jKeyFractionRangeRv->stringPiece().str();
    }
    if (auto jValidateReplies = json.get_ptr("validate_replies")) {
      checkLogic(jValidateReplies->isBool(),
                 "validate_replies is not a bool");
      result->validateReplies_ = jValidateReplies->getBool();
    }
  } catch (const std::logic_error& e) {
    MC_LOG_FAILURE(router.opts(), failure::Category::kInvalidConfig,
                   "ShadowSettings: {}", e.what());
    return nullptr;
  }

  result->registerOnUpdateCallback(router);

  return result;
}

McrouterRouteHandlePtr makeFailoverRoute(
    const folly::dynamic& json,
    std::vector<McrouterRouteHandlePtr> children) {

  FailoverErrorsSettings failoverErrors;
  std::unique_ptr<FailoverRateLimiter> rateLimiter;
  bool failoverTagging = false;
  if (json.isObject()) {
    if (auto jFailoverErrors = json.get_ptr("failover_errors")) {
      failoverErrors = FailoverErrorsSettings(*jFailoverErrors);
    }
    if (auto jFailoverTag = json.get_ptr("failover_tag")) {
      checkLogic(jFailoverTag->isBool(),
                 "Failover: failover_tag is not bool");
      failoverTagging = jFailoverTag->getBool();
    }
    if (auto jFailoverLimit = json.get_ptr("failover_limit")) {
      rateLimiter = folly::make_unique<FailoverRateLimiter>(*jFailoverLimit);
    }
  }
  return makeFailoverRoute(std::move(children), std::move(failoverErrors),
                           std::move(rateLimiter), failoverTagging);
}

PoolFactory::PoolFactory(const folly::dynamic& config,
                         ConfigApi& configApi,
                         const McrouterOptions& opts)
  : configApi_(configApi),
    opts_(opts) {

  checkLogic(config.isObject(), "config is not an object");
  if (auto jpools = config.get_ptr("pools")) {
    checkLogic(jpools->isObject(), "config: 'pools' is not an object");

    for (const auto& it : jpools->items()) {
      parsePool(it.first.stringPiece().str(), it.second);
    }
  }
}

McrouterRouteHandlePtr makeFailoverWithExptimeRoute(
    RouteHandleFactory<McrouterRouteHandleIf>& factory,
    const folly::dynamic& json) {
  checkLogic(json.isObject(), "FailoverWithExptimeRoute is not an object");

  McrouterRouteHandlePtr normal;
  if (auto jnormal = json.get_ptr("normal")) {
    normal = factory.create(*jnormal);
  }

  std::vector<McrouterRouteHandlePtr> failoverTargets;
  if (auto jfailover = json.get_ptr("failover")) {
    failoverTargets = factory.createList(*jfailover);
  }

  int32_t failoverExptime = 60;
  if (auto jexptime = json.get_ptr("failover_exptime")) {
    checkLogic(jexptime->isInt(), "FailoverWithExptimeRoute: "
                                  "failover_exptime is not an integer");
    failoverExptime = jexptime->getInt();
  }

  // Check if only one format is being used
  checkLogic(!(json.count("settings") && // old
        (json.count("failover_errors") || json.count("failover_tag"))), // new
      "Use either 'settings' (old format) or 'failover_errors' / 'failover_tag'"
    );

  // new format
  FailoverErrorsSettings failoverErrors;
  bool failoverTagging = false;
  if (auto jfailoverTag = json.get_ptr("failover_tag")) {
    checkLogic(jfailoverTag->isBool(),
               "FailoverWithExptime: failover_tag is not bool");
    failoverTagging = jfailoverTag->getBool();
  }
  if (auto jfailoverErrors = json.get_ptr("failover_errors")) {
    failoverErrors = FailoverErrorsSettings(*jfailoverErrors);
  }

  // old format
  if (auto jsettings = json.get_ptr("settings")) {
    VLOG(1) << "FailoverWithExptime: This config format is deprecated. "
               "Use 'failover_errors' instead of 'settings'.";
    auto oldSettings = FailoverWithExptimeSettings(*jsettings);
    failoverTagging = oldSettings.failoverTagging;
    failoverErrors = oldSettings.getFailoverErrors();
  }

  return makeFailoverWithExptimeRoute(
    std::move(normal),
    std::move(failoverTargets),
    failoverExptime,
    std::move(failoverErrors),
    failoverTagging);
}