mirror of https://gitee.com/bigwinds/arangodb
448 lines
13 KiB
C++
448 lines
13 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#include "CollectionNameResolver.h"
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#include "Basics/Common.h"
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#include "Basics/NumberUtils.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/StringUtils.h"
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#include "Cluster/ClusterInfo.h"
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#include "VocBase/LogicalCollection.h"
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#include "VocBase/LogicalView.h"
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#include "VocBase/vocbase.h"
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namespace arangodb {
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std::shared_ptr<LogicalCollection> CollectionNameResolver::getCollection(
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TRI_voc_cid_t id
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) const noexcept {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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return std::dynamic_pointer_cast<LogicalCollection>(getDataSource(id));
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#else
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auto dataSource = getDataSource(id);
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return dataSource && dataSource->category() == LogicalCollection::category()
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? std::static_pointer_cast<LogicalCollection>(dataSource) : nullptr;
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#endif
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}
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std::shared_ptr<LogicalCollection> CollectionNameResolver::getCollection(
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std::string const& nameOrId
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) const noexcept {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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return std::dynamic_pointer_cast<LogicalCollection>(getDataSource(nameOrId));
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#else
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auto dataSource = getDataSource(nameOrId);
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return dataSource && dataSource->category() == LogicalCollection::category()
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? std::static_pointer_cast<LogicalCollection>(dataSource) : nullptr;
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#endif
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a collection id for a collection name (local case),
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/// use this if you know you are on a single server or on a DBserver
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/// and need to look up a local collection name (or shard name).
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//////////////////////////////////////////////////////////////////////////////
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TRI_voc_cid_t CollectionNameResolver::getCollectionIdLocal(
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std::string const& name) const {
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if (name[0] >= '0' && name[0] <= '9') {
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// name is a numeric id
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return NumberUtils::atoi_zero<TRI_voc_cid_t>(name.data(), name.data() + name.size());
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}
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arangodb::LogicalCollection const* collection = getCollectionStruct(name);
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if (collection != nullptr) {
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return collection->id();
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}
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auto view = _vocbase->lookupView(name);
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if (view) {
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return view->id();
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}
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a cluster collection id for a cluster collection name,
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/// only use this is in cluster mode on a coordinator or DBserver, in both
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/// cases the name is resolved as a cluster wide collection name and the
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/// cluster wide collection id is returned.
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//////////////////////////////////////////////////////////////////////////////
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TRI_voc_cid_t CollectionNameResolver::getCollectionIdCluster(
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std::string const& name) const {
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if (!ServerState::isRunningInCluster(_serverRole)) {
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return getCollectionIdLocal(name);
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}
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if (name[0] >= '0' && name[0] <= '9') {
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// name is a numeric id
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TRI_voc_cid_t cid = NumberUtils::atoi_zero<TRI_voc_cid_t>(name.data(), name.data() + name.size());
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auto collection = getCollection(cid);
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// Now validate the cid
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auto type = collection ? collection->type() : TRI_COL_TYPE_UNKNOWN;
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if (type == TRI_COL_TYPE_UNKNOWN) {
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return 0;
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}
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return cid;
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}
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try {
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// We have to look up the collection info:
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ClusterInfo* ci = ClusterInfo::instance();
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auto cinfo = ci->getCollection(_vocbase->name(), name);
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if (cinfo) {
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return cinfo->id();
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}
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auto vinfo = ci->getView(_vocbase->name(), name);
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if (vinfo) {
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return vinfo->id();
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}
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} catch (...) {
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}
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a collection id for a collection name, this is the
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/// default one to use, which will usually do the right thing. On a
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/// single server or DBserver it will use the local lookup and on a
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/// coordinator it will use the cluster wide lookup.
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//////////////////////////////////////////////////////////////////////////////
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TRI_voc_cid_t CollectionNameResolver::getCollectionId(
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std::string const& name) const {
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if (!ServerState::isRunningInCluster(_serverRole) ||
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ServerState::isDBServer(_serverRole)) {
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return getCollectionIdLocal(name);
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}
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return getCollectionIdCluster(name);
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a collection struct for a collection name
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//////////////////////////////////////////////////////////////////////////////
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arangodb::LogicalCollection const* CollectionNameResolver::getCollectionStruct(
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std::string const& name) const {
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auto it = _resolvedNames.find(name);
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if (it != _resolvedNames.end()) {
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return (*it).second;
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}
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auto* collection = _vocbase->lookupCollection(name).get();
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if (collection != nullptr) {
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_resolvedNames.emplace(name, collection);
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}
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return collection;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a collection name for a collection id, this implements
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/// some magic in the cluster case: a DBserver in a cluster will automatically
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/// translate the local collection ID into a cluster wide collection name.
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//////////////////////////////////////////////////////////////////////////////
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std::string CollectionNameResolver::getCollectionName(TRI_voc_cid_t cid) const {
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auto it = _resolvedIds.find(cid);
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if (it != _resolvedIds.end()) {
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return (*it).second;
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}
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std::string name = localNameLookup(cid);
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_resolvedIds.emplace(cid, name);
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return name;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief look up a cluster-wide collection name for a cluster-wide
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/// collection id
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//////////////////////////////////////////////////////////////////////////////
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std::string CollectionNameResolver::getCollectionNameCluster(
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TRI_voc_cid_t cid) const {
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// First check the cache:
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auto it = _resolvedIds.find(cid);
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if (it != _resolvedIds.end()) {
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return (*it).second;
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}
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if (!ServerState::isClusterRole(_serverRole)) {
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// This handles the case of a standalone server
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return getCollectionName(cid);
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}
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std::string name;
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if (ServerState::isDBServer(_serverRole)) {
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// This might be a local system collection:
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name = localNameLookup(cid);
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if (name != "_unknown") {
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_resolvedIds.emplace(cid, name);
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return name;
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}
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}
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int tries = 0;
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while (tries++ < 2) {
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try {
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auto ci = ClusterInfo::instance()->getCollection(
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_vocbase->name(), arangodb::basics::StringUtils::itoa(cid));
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name = ci->name();
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_resolvedIds.emplace(cid, name);
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return name;
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} catch (...) {
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// most likely collection not found. now try again
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ClusterInfo::instance()->flush();
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}
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}
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LOG_TOPIC(ERR, arangodb::Logger::FIXME) << "CollectionNameResolver: was not able to resolve id " << cid;
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return "_unknown";
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief return collection name if given string is either the name or
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/// a string with the (numerical) collection id, this returns the cluster
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/// wide collection name in the DBserver case
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//////////////////////////////////////////////////////////////////////////////
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std::string CollectionNameResolver::getCollectionName(
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std::string const& nameOrId) const {
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if (!nameOrId.empty() &&
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(nameOrId[0] < '0' || nameOrId[0] > '9')) {
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return nameOrId;
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}
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return getCollectionName(NumberUtils::atoi_zero<TRI_voc_cid_t>(nameOrId.data(), nameOrId.data() + nameOrId.size()));
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}
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std::string CollectionNameResolver::localNameLookup(TRI_voc_cid_t cid) const {
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std::string name;
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if (ServerState::isDBServer(_serverRole)) {
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READ_LOCKER(readLocker, _vocbase->_dataSourceLock);
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auto it = _vocbase->_dataSourceById.find(cid);
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if (it != _vocbase->_dataSourceById.end()
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&& LogicalCollection::category() == it->second->category()) {
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if (it->second->planId() == it->second->id()) {
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// DBserver local case
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name = (*it).second->name();
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} else {
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// DBserver case of a shard:
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name = arangodb::basics::StringUtils::itoa((*it).second->planId());
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std::shared_ptr<LogicalCollection> ci;
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try {
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TRI_ASSERT(it->second->vocbase());
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ci = ClusterInfo::instance()->getCollection(
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it->second->vocbase()->name(), name
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);
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}
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catch (...) {
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}
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if (ci == nullptr) {
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name = ""; // collection unknown
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} else {
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name = ci->name(); // can be empty, if collection unknown
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}
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}
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}
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} else {
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// exactly as in the non-cluster case
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name = _vocbase->collectionName(cid);
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}
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if (name.empty()) {
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name = "_unknown";
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}
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return name;
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}
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std::shared_ptr<LogicalDataSource> CollectionNameResolver::getDataSource(
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TRI_voc_cid_t id
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) const noexcept {
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auto itr = _dataSourceById.find(id);
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if (itr != _dataSourceById.end()) {
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return itr->second;
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}
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std::shared_ptr<LogicalDataSource> ptr;
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// db server / standalone
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if (!ServerState::isCoordinator(_serverRole)) {
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ptr = _vocbase ? _vocbase->lookupDataSource(id) : nullptr;
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} else {
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ptr = getDataSource(std::to_string(id));
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}
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if (ptr) {
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_dataSourceById.emplace(id, ptr);
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}
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return ptr;
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}
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std::shared_ptr<LogicalDataSource> CollectionNameResolver::getDataSource(
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std::string const& nameOrId
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) const noexcept {
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auto itr = _dataSourceByName.find(nameOrId);
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if (itr != _dataSourceByName.end()) {
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return itr->second;
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}
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std::shared_ptr<LogicalDataSource> ptr;
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// db server / standalone
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if (!ServerState::isCoordinator(_serverRole)) {
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ptr = _vocbase ? _vocbase->lookupDataSource(nameOrId) : nullptr;
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} else {
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// cluster coordinator
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auto* ci = ClusterInfo::instance();
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if (!ci) {
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return nullptr;
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}
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try {
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ptr = std::static_pointer_cast<LogicalDataSource>(
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ci->getCollection(_vocbase->name(), nameOrId)
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);
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if (!ptr) {
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ptr = std::static_pointer_cast<LogicalDataSource>(
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ci->getView(_vocbase->name(), nameOrId)
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);
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}
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} catch (...) {
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LOG_TOPIC(ERR, arangodb::Logger::FIXME)
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<< "caught exception while resolving cluster data-source: " << nameOrId;
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}
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}
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if (ptr) {
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_dataSourceByName.emplace(nameOrId, ptr);
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}
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return ptr;
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}
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std::shared_ptr<LogicalView> CollectionNameResolver::getView(
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TRI_voc_cid_t id
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) const noexcept {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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return std::dynamic_pointer_cast<LogicalView>(getDataSource(id));
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#else
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auto dataSource = getDataSource(id);
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return dataSource && dataSource->category() == LogicalView::category()
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? std::static_pointer_cast<LogicalView>(dataSource) : nullptr;
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#endif
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}
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std::shared_ptr<LogicalView> CollectionNameResolver::getView(
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std::string const& nameOrId
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) const noexcept {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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return std::dynamic_pointer_cast<LogicalView>(getDataSource(nameOrId));
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#else
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auto dataSource = getDataSource(nameOrId);
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return dataSource && dataSource->category() == LogicalView::category()
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? std::static_pointer_cast<LogicalView>(dataSource) : nullptr;
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#endif
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}
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std::string CollectionNameResolver::getViewNameCluster(
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TRI_voc_cid_t cid
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) const {
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if (!ServerState::isClusterRole(_serverRole)) {
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// This handles the case of a standalone server
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return _vocbase->viewName(cid);
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}
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// FIXME not supported
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return StaticStrings::Empty;
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}
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bool CollectionNameResolver::visitCollections(
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std::function<bool(LogicalCollection&)> const& visitor,
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TRI_voc_cid_t id
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) const {
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auto dataSource = getDataSource(id);
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if (!dataSource) {
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return false; // no way to determine what to visit
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}
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if (LogicalCollection::category() == dataSource->category()) {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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auto collection = std::dynamic_pointer_cast<LogicalCollection>(dataSource);
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TRI_ASSERT(collection);
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#else
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auto collection = std::static_pointer_cast<LogicalCollection>(dataSource);
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#endif
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// TODO resolve smart edge collection CIDs here
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return visitor(*collection);
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}
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if (LogicalView::category() == dataSource->category()) {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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auto view = std::dynamic_pointer_cast<LogicalView>(dataSource);
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#else
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auto view = std::static_pointer_cast<LogicalView>(dataSource);
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#endif
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// each CID in a view might need further resolution
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return view->visitCollections([this, &visitor, id](TRI_voc_cid_t cid)->bool {
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return cid == id ? false : visitCollections(visitor, cid); // avoid infinite recursion
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});
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}
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return false; // no way to determine what to visit
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}
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} // namespace arangodb
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