mirror of https://gitee.com/bigwinds/arangodb
346 lines
11 KiB
C++
346 lines
11 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 Christoph Uhde
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////////////////////////////////////////////////////////////////////////////////
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#include "RestTransactionHandler.h"
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#include "Actions/ActionFeature.h"
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#include "ApplicationFeatures/ApplicationServer.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/WriteLocker.h"
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#include "Cluster/ServerState.h"
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#include "StorageEngine/EngineSelectorFeature.h"
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#include "Transaction/Manager.h"
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#include "Transaction/ManagerFeature.h"
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#include "Transaction/Helpers.h"
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#include "Transaction/Status.h"
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#include "V8/JavaScriptSecurityContext.h"
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#include "V8Server/V8Context.h"
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#include "V8Server/V8DealerFeature.h"
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#include "VocBase/Methods/Transactions.h"
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#include "VocBase/voc-types.h"
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#include <velocypack/Builder.h>
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#include <velocypack/velocypack-aliases.h>
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using namespace arangodb;
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using namespace arangodb::basics;
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using namespace arangodb::rest;
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RestTransactionHandler::RestTransactionHandler(GeneralRequest* request, GeneralResponse* response)
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: RestVocbaseBaseHandler(request, response), _v8Context(nullptr), _lock() {}
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RestStatus RestTransactionHandler::execute() {
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switch (_request->requestType()) {
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case rest::RequestType::POST:
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if (_request->suffixes().size() == 1 &&
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_request->suffixes()[0] == "begin") {
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executeBegin();
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} else if (_request->suffixes().empty()) {
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executeJSTransaction();
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} else {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER);
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}
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break;
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case rest::RequestType::PUT:
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executeCommit();
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break;
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case rest::RequestType::DELETE_REQ:
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executeAbort();
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break;
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case rest::RequestType::GET:
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executeGetState();
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break;
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default:
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generateError(rest::ResponseCode::METHOD_NOT_ALLOWED, TRI_ERROR_HTTP_METHOD_NOT_ALLOWED);
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break;
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}
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return RestStatus::DONE;
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}
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void RestTransactionHandler::executeGetState() {
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if (_request->suffixes().empty()) {
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// no transaction id given - so list all the transactions
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auto context = arangodb::ExecContext::CURRENT;
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std::string user;
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if (context != nullptr || arangodb::ExecContext::isAuthEnabled()) {
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user = context->user();
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}
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VPackBuilder builder;
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builder.openObject();
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builder.add("transactions", VPackValue(VPackValueType::Array));
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bool const fanout = ServerState::instance()->isCoordinator() && !_request->parsedValue("local", false);
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transaction::Manager* mgr = transaction::ManagerFeature::manager();
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mgr->toVelocyPack(builder, _vocbase.name(), user, fanout);
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builder.close(); // array
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builder.close(); // object
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generateResult(rest::ResponseCode::OK, builder.slice());
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return;
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}
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if (_request->suffixes().size() != 1) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER,
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"expecting GET /_api/transaction/<transaction-ID>");
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return;
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}
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TRI_voc_tid_t tid = StringUtils::uint64(_request->suffixes()[0]);
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if (tid == 0) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER,
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"Illegal transaction ID");
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return;
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}
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transaction::Manager* mgr = transaction::ManagerFeature::manager();
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transaction::Status status = mgr->getManagedTrxStatus(tid);
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if (status == transaction::Status::UNDEFINED) {
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generateError(rest::ResponseCode::NOT_FOUND, TRI_ERROR_TRANSACTION_NOT_FOUND);
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} else {
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generateTransactionResult(rest::ResponseCode::OK, tid, status);
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}
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}
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void RestTransactionHandler::executeBegin() {
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TRI_ASSERT(_request->suffixes().size() == 1 &&
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_request->suffixes()[0] == "begin");
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// figure out the transaction ID
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TRI_voc_tid_t tid = 0;
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bool found = false;
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std::string value = _request->header(StaticStrings::TransactionId, found);
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ServerState::RoleEnum role = ServerState::instance()->getRole();
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if (found) {
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if (!ServerState::isDBServer(role)) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_NOT_IMPLEMENTED,
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"Not supported on this server type");
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return;
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}
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tid = basics::StringUtils::uint64(value);
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if (tid == 0 || !transaction::isChildTransactionId(tid)) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER,
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"invalid transaction ID on DBServer");
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return;
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}
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TRI_ASSERT(tid != 0);
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TRI_ASSERT(!transaction::isLegacyTransactionId(tid));
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} else {
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if (!ServerState::isCoordinator(role) && !ServerState::isSingleServer(role)) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_NOT_IMPLEMENTED,
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"Not supported on this server type");
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return;
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}
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tid = ServerState::isSingleServer(role) ? TRI_NewTickServer() :
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TRI_NewServerSpecificTickMod4();
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}
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TRI_ASSERT(tid != 0);
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bool parseSuccess = false;
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VPackSlice slice = parseVPackBody(parseSuccess);
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if (!parseSuccess) {
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// error message generated in parseVPackBody
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return;
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}
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transaction::Manager* mgr = transaction::ManagerFeature::manager();
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TRI_ASSERT(mgr != nullptr);
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Result res = mgr->createManagedTrx(_vocbase, tid, slice);
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if (res.fail()) {
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generateError(res);
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} else {
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generateTransactionResult(rest::ResponseCode::CREATED, tid, transaction::Status::RUNNING);
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}
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}
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void RestTransactionHandler::executeCommit() {
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if (_request->suffixes().size() != 1) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER);
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return;
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}
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TRI_voc_tid_t tid = basics::StringUtils::uint64(_request->suffixes()[0]);
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if (tid == 0) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER,
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"bad transaction ID");
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return;
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}
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transaction::Manager* mgr = transaction::ManagerFeature::manager();
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TRI_ASSERT(mgr != nullptr);
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Result res = mgr->commitManagedTrx(tid);
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if (res.fail()) {
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generateError(res);
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} else {
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generateTransactionResult(rest::ResponseCode::OK, tid, transaction::Status::COMMITTED);
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}
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}
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void RestTransactionHandler::executeAbort() {
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if (_request->suffixes().size() != 1) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER);
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return;
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}
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TRI_voc_tid_t tid = basics::StringUtils::uint64(_request->suffixes()[0]);
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if (tid == 0) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_BAD_PARAMETER,
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"bad transaction ID");
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return;
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}
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transaction::Manager* mgr = transaction::ManagerFeature::manager();
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TRI_ASSERT(mgr != nullptr);
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Result res = mgr->abortManagedTrx(tid);
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if (res.fail()) {
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generateError(res);
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} else {
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generateTransactionResult(rest::ResponseCode::OK, tid, transaction::Status::ABORTED);
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}
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}
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void RestTransactionHandler::generateTransactionResult(rest::ResponseCode code,
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TRI_voc_tid_t tid,
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transaction::Status status) {
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VPackBuffer<uint8_t> buffer;
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VPackBuilder tmp(buffer);
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tmp.add(VPackValue(VPackValueType::Object, true));
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tmp.add(StaticStrings::Code, VPackValue(static_cast<int>(code)));
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tmp.add(StaticStrings::Error, VPackValue(false));
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tmp.add("result", VPackValue(VPackValueType::Object, true));
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tmp.add("id", VPackValue(std::to_string(tid)));
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tmp.add("status", VPackValue(transaction::statusString(status)));
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tmp.close();
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tmp.close();
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generateResult(code, std::move(buffer));
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}
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// ====================== V8 stuff ===================
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/// start a legacy JS transaction
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void RestTransactionHandler::executeJSTransaction() {
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if (!V8DealerFeature::DEALER) {
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generateError(rest::ResponseCode::BAD, TRI_ERROR_INTERNAL,
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"JavaScript transactions are not available");
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return;
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}
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auto slice = _request->payload();
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if (!slice.isObject()) {
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generateError(
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Result(TRI_ERROR_BAD_PARAMETER, "expecting object input data"));
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return;
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}
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std::string portType = _request->connectionInfo().portType();
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bool allowUseDatabase = ActionFeature::ACTION->allowUseDatabase();
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JavaScriptSecurityContext securityContext = JavaScriptSecurityContext::createRestActionContext(allowUseDatabase);
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_v8Context = V8DealerFeature::DEALER->enterContext(&_vocbase, securityContext);
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if (!_v8Context) {
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generateError(Result(TRI_ERROR_INTERNAL, "could not acquire v8 context"));
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return;
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}
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TRI_DEFER(returnContext());
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VPackBuilder result;
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try {
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{
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WRITE_LOCKER(lock, _lock);
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if (_canceled) {
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generateCanceled();
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return;
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}
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}
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Result res = executeTransaction(_v8Context->_isolate, _lock, _canceled,
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slice, portType, result);
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if (res.ok()) {
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VPackSlice slice = result.slice();
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if (slice.isNone()) {
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generateOk(rest::ResponseCode::OK, VPackSlice::nullSlice());
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} else {
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generateOk(rest::ResponseCode::OK, slice);
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}
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} else {
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generateError(res);
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}
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} catch (arangodb::basics::Exception const& ex) {
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generateError(Result(ex.code(), ex.what()));
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} catch (std::exception const& ex) {
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generateError(Result(TRI_ERROR_INTERNAL, ex.what()));
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} catch (...) {
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generateError(Result(TRI_ERROR_INTERNAL));
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}
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}
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void RestTransactionHandler::returnContext() {
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WRITE_LOCKER(writeLock, _lock);
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V8DealerFeature::DEALER->exitContext(_v8Context);
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_v8Context = nullptr;
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}
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bool RestTransactionHandler::cancel() {
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// cancel v8 transaction
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WRITE_LOCKER(writeLock, _lock);
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_canceled.store(true);
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auto isolate = _v8Context->_isolate;
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if (!isolate->IsExecutionTerminating()) {
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isolate->TerminateExecution();
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}
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return true;
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}
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/// @brief returns the short id of the server which should handle this request
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uint32_t RestTransactionHandler::forwardingTarget() {
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rest::RequestType const type = _request->requestType();
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if (type != rest::RequestType::GET && type != rest::RequestType::PUT &&
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type != rest::RequestType::DELETE_REQ) {
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return 0;
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}
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std::vector<std::string> const& suffixes = _request->suffixes();
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if (suffixes.size() < 1) {
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return 0;
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}
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uint64_t tick = arangodb::basics::StringUtils::uint64(suffixes[0]);
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uint32_t sourceServer = TRI_ExtractServerIdFromTick(tick);
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return (sourceServer == ServerState::instance()->getShortId()) ? 0 : sourceServer;
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}
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