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arangodb/lib/SimpleHttpClient/SimpleHttpClient.cpp

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Achim Brandt
/// @author Simon Grätzer
////////////////////////////////////////////////////////////////////////////////
#include "SimpleHttpClient.h"
#include "Basics/StringUtils.h"
#include "Logger/Logger.h"
#include "Rest/HttpResponse.h"
#include "SimpleHttpClient/GeneralClientConnection.h"
#include "SimpleHttpClient/SimpleHttpResult.h"
#include <velocypack/Parser.h>
#include <velocypack/velocypack-aliases.h>
using namespace arangodb;
using namespace arangodb::basics;
namespace arangodb {
namespace httpclient {
/// @brief empty map, used for headers
std::unordered_map<std::string, std::string> const
SimpleHttpClient::NO_HEADERS{};
/// @brief default value for max packet size
size_t SimpleHttpClientParams::MaxPacketSize = 256 * 1024 * 1024;
SimpleHttpClient::SimpleHttpClient(GeneralClientConnection* connection,
SimpleHttpClientParams const& params)
: _connection(connection),
_deleteConnectionOnDestruction(false),
_params(params),
_writeBuffer(TRI_UNKNOWN_MEM_ZONE, false),
_readBuffer(TRI_UNKNOWN_MEM_ZONE),
_readBufferOffset(0),
_state(IN_CONNECT),
_written(0),
_errorMessage(""),
_nextChunkedSize(0),
_method(rest::RequestType::GET),
_result(nullptr)
{
TRI_ASSERT(connection != nullptr);
if (_connection->isConnected()) {
_state = FINISHED;
}
}
SimpleHttpClient::SimpleHttpClient(
std::unique_ptr<GeneralClientConnection>& connection,
SimpleHttpClientParams const& params)
: SimpleHttpClient(connection.get(), params) {
_deleteConnectionOnDestruction = true;
connection.release();
}
SimpleHttpClient::~SimpleHttpClient() {
// connection may have been invalidated by other objects
if (_connection != nullptr) {
if (!_params._keepConnectionOnDestruction || !_connection->isConnected()) {
_connection->disconnect();
}
if (_deleteConnectionOnDestruction) {
delete _connection;
}
}
}
// -----------------------------------------------------------------------------
// public methods
// -----------------------------------------------------------------------------
void SimpleHttpClient::setInterrupted(bool value) {
if (_connection != nullptr) {
_connection->setInterrupted(value);
}
}
bool SimpleHttpClient::isConnected() { return _connection->isConnected(); }
void SimpleHttpClient::disconnect() { _connection->disconnect(); }
std::string SimpleHttpClient::getEndpointSpecification() const {
return _connection == nullptr ? "unknown"
: _connection->getEndpointSpecification();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief close connection
////////////////////////////////////////////////////////////////////////////////
void SimpleHttpClient::close() {
// ensure connection has not yet been invalidated
TRI_ASSERT(_connection != nullptr);
_connection->disconnect();
_state = IN_CONNECT;
clearReadBuffer();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send out a request, creating a new HttpResult object
/// this version does not allow specifying custom headers
/// if the request fails because of connection problems, the request will be
/// retried until it either succeeds (at least no connection problem) or there
/// have been _maxRetries retries
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::retryRequest(rest::RequestType method,
std::string const& location,
char const* body,
size_t bodyLength) {
return retryRequest(method, location, body, bodyLength, NO_HEADERS);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send out a request, creating a new HttpResult object
/// this version does not allow specifying custom headers
/// if the request fails because of connection problems, the request will be
/// retried until it either succeeds (at least no connection problem) or there
/// have been _maxRetries retries
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::retryRequest(
rest::RequestType method, std::string const& location, char const* body,
size_t bodyLength,
std::unordered_map<std::string, std::string> const& headers) {
SimpleHttpResult* result = nullptr;
size_t tries = 0;
while (true) {
TRI_ASSERT(result == nullptr);
result = doRequest(method, location, body, bodyLength, headers);
if (result != nullptr && result->isComplete()) {
break;
}
delete result;
result = nullptr;
if (tries++ >= _params._maxRetries) {
break;
}
if (!_params._retryMessage.empty() && (_params._maxRetries - tries) > 0) {
LOG_TOPIC(WARN, arangodb::Logger::FIXME) << "" << _params._retryMessage
<< " - retries left: " << (_params._maxRetries - tries);
}
usleep(static_cast<TRI_usleep_t>(_params._retryWaitTime));
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send out a request, creating a new HttpResult object
/// this version does not allow specifying custom headers
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::request(rest::RequestType method,
std::string const& location,
char const* body,
size_t bodyLength) {
return doRequest(method, location, body, bodyLength, NO_HEADERS);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send out a request, creating a new HttpResult object
/// this version allows specifying custom headers
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::request(
rest::RequestType method, std::string const& location, char const* body,
size_t bodyLength,
std::unordered_map<std::string, std::string> const& headers) {
return doRequest(method, location, body, bodyLength, headers);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send out a request, worker function
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::doRequest(
rest::RequestType method, std::string const& location, char const* body,
size_t bodyLength,
std::unordered_map<std::string, std::string> const& headers) {
// ensure connection has not yet been invalidated
TRI_ASSERT(_connection != nullptr);
// ensure that result is empty
TRI_ASSERT(_result == nullptr);
// create a new result
_result = new SimpleHttpResult();
// reset error message
_errorMessage = "";
// set body
setRequest(method, rewriteLocation(location), body, bodyLength, headers);
// ensure state
TRI_ASSERT(_state == IN_CONNECT || _state == IN_WRITE);
// respect timeout
double endTime = TRI_microtime() + _params._requestTimeout;
double remainingTime = _params._requestTimeout;
bool haveSentRequest = false;
while (_state < FINISHED && remainingTime > 0.0) {
// Note that this loop can either be left by timeout or because
// a connect did not work (which sets the _state to DEAD). In all
// other error conditions we call close() which resets the state
// to IN_CONNECT and tries a reconnect. This is important because
// it is always possible that we are called with a connection that
// has already been closed by the other side. This leads to the
// strange effect that the write (if it is small enough) proceeds
// but the following read runs into an error. In that case we try
// to reconnect one and then give up if this does not work.
switch (_state) {
case (IN_CONNECT): {
handleConnect();
// If this goes wrong, _state is set to DEAD
break;
}
case (IN_WRITE): {
size_t bytesWritten = 0;
TRI_ASSERT(_writeBuffer.length() >= _written);
TRI_set_errno(TRI_ERROR_NO_ERROR);
bool res = _connection->handleWrite(
remainingTime,
static_cast<void const*>(_writeBuffer.c_str() + _written),
_writeBuffer.length() - _written, &bytesWritten);
if (!res) {
setErrorMessage("Error writing to '" +
_connection->getEndpoint()->specification() + "' '" +
_connection->getErrorDetails() + "'");
this->close(); // this sets _state to IN_CONNECT for a retry
} else {
_written += bytesWritten;
if (_written == _writeBuffer.length()) {
_state = IN_READ_HEADER;
haveSentRequest = true;
}
}
break;
}
case (IN_READ_HEADER):
case (IN_READ_BODY):
case (IN_READ_CHUNKED_HEADER):
case (IN_READ_CHUNKED_BODY): {
TRI_set_errno(TRI_ERROR_NO_ERROR);
// we need to notice if the other side has closed the connection:
bool connectionClosed;
bool res = _connection->handleRead(remainingTime, _readBuffer,
connectionClosed);
// If there was an error, then we are doomed:
if (!res) {
setErrorMessage("Error reading from: '" +
_connection->getEndpoint()->specification() + "' '" +
_connection->getErrorDetails() + "'");
if (_connection->isInterrupted()) {
this->close();
delete _result;
_result = nullptr;
setErrorMessage("Command locally aborted");
return nullptr;
}
this->close(); // this sets the state to IN_CONNECT for a retry
_state = DEAD;
setErrorMessage("Request timeout reached");
break;
}
// no error
if (connectionClosed) {
// write might have succeeded even if the server has closed
// the connection, this will then show up here with us being
// in state IN_READ_HEADER but nothing read.
if (_state == IN_READ_HEADER && 0 == _readBuffer.length()) {
this->close();
_state = DEAD;
setErrorMessage("Connection closed by remote");
break;
}
if (_state == IN_READ_HEADER) {
processHeader();
}
if (_state == IN_READ_BODY && !_result->hasContentLength()) {
// If we are reading the body and no content length was
// found in the header, then we must read until no more
// progress is made (but without an error), this then means
// that the server has closed the connection and we must
// process the body one more time:
_result->setContentLength(_readBuffer.length() - _readBufferOffset);
processBody();
} else if (_state == IN_READ_BODY) {
processBody();
}
if (_state != FINISHED) {
// If the body was not fully found we give up:
this->close();
_state = DEAD;
setErrorMessage("Got unexpected response from remote");
}
break;
}
// the connection is still alive:
switch (_state) {
case (IN_READ_HEADER):
processHeader();
break;
case (IN_READ_BODY):
processBody();
break;
case (IN_READ_CHUNKED_HEADER):
processChunkedHeader();
break;
case (IN_READ_CHUNKED_BODY):
processChunkedBody();
break;
default:
break;
}
break;
}
default:
break;
}
remainingTime = endTime - TRI_microtime();
}
if (_state < FINISHED && _errorMessage.empty()) {
setErrorMessage("Request timeout reached");
}
// set result type in getResult()
SimpleHttpResult* result = getResult(haveSentRequest);
_result = nullptr;
return result;
}
// -----------------------------------------------------------------------------
// private methods
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @brief initialize the connection
////////////////////////////////////////////////////////////////////////////////
void SimpleHttpClient::handleConnect() {
// ensure connection has not yet been invalidated
TRI_ASSERT(_connection != nullptr);
if (!_connection->connect()) {
setErrorMessage("Could not connect to '" +
_connection->getEndpoint()->specification() + "' '" +
_connection->getErrorDetails() + "'");
_state = DEAD;
} else {
// can write now
_state = IN_WRITE;
_written = 0;
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief clearReadBuffer, clears the read buffer as well as the result
////////////////////////////////////////////////////////////////////////////////
void SimpleHttpClient::clearReadBuffer() {
_readBuffer.clear();
_readBufferOffset = 0;
if (_result) {
_result->clear();
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief return the result
////////////////////////////////////////////////////////////////////////////////
SimpleHttpResult* SimpleHttpClient::getResult(bool haveSentRequest) {
_result->setHaveSentRequestFully(haveSentRequest);
switch (_state) {
case IN_WRITE:
_result->setResultType(SimpleHttpResult::WRITE_ERROR);
break;
case IN_READ_HEADER:
case IN_READ_BODY:
case IN_READ_CHUNKED_HEADER:
case IN_READ_CHUNKED_BODY:
_result->setResultType(SimpleHttpResult::READ_ERROR);
break;
case FINISHED:
_result->setResultType(SimpleHttpResult::COMPLETE);
break;
case IN_CONNECT:
default: {
_result->setResultType(SimpleHttpResult::COULD_NOT_CONNECT);
if (!haveErrorMessage()) {
setErrorMessage("Could not connect");
}
break;
}
}
if (haveErrorMessage() && _result->getHttpReturnMessage().empty()) {
_result->setHttpReturnMessage(_errorMessage);
}
return _result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief prepare a request
////////////////////////////////////////////////////////////////////////////////
void SimpleHttpClient::setRequest(
rest::RequestType method, std::string const& location, char const* body,
size_t bodyLength,
std::unordered_map<std::string, std::string> const& headers) {
// clear read-buffer (no pipeling!)
_readBufferOffset = 0;
_readBuffer.reset();
// set HTTP method
_method = method;
// now fill the write buffer
_writeBuffer.clear();
// append method
HttpRequest::appendMethod(method, &_writeBuffer);
// append location
std::string const* l = &location;
std::string appended;
if (location.empty() || location[0] != '/') {
appended = "/" + location;
l = &appended;
}
_writeBuffer.appendText(*l);
// append protocol
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR(" HTTP/1.1\r\n"));
// append hostname
std::string hostname = _connection->getEndpoint()->host();
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Host: "));
_writeBuffer.appendText(hostname);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n"));
if (_params._keepAlive) {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Connection: Keep-Alive\r\n"));
} else {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Connection: Close\r\n"));
}
if (_params._exposeArangoDB) {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("User-Agent: ArangoDB\r\n"));
}
// do not automatically advertise deflate support
if (_params._supportDeflate) {
_writeBuffer.appendText(
TRI_CHAR_LENGTH_PAIR("Accept-Encoding: deflate\r\n"));
}
// do basic authorization
if (!_params._pathToBasicAuth.empty()) {
std::string foundPrefix;
std::string foundValue;
auto i = _params._pathToBasicAuth.begin();
for (; i != _params._pathToBasicAuth.end(); ++i) {
std::string& f = i->first;
if (l->compare(0, f.size(), f) == 0) {
// f is prefix of l
if (f.length() > foundPrefix.length()) {
foundPrefix = f;
foundValue = i->second;
}
}
}
if (!foundValue.empty()) {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Authorization: Basic "));
_writeBuffer.appendText(foundValue);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n"));
}
}
if (!_params._jwt.empty()) {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Authorization: bearer "));
_writeBuffer.appendText(_params._jwt);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n"));
}
for (auto const& header : headers) {
_writeBuffer.appendText(header.first);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR(": "));
_writeBuffer.appendText(header.second);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n"));
}
if (method != rest::RequestType::GET) {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("Content-Length: "));
_writeBuffer.appendInteger(bodyLength);
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n\r\n"));
} else {
_writeBuffer.appendText(TRI_CHAR_LENGTH_PAIR("\r\n"));
}
if (body != nullptr) {
_writeBuffer.appendText(body, bodyLength);
}
_writeBuffer.ensureNullTerminated();
LOG_TOPIC(TRACE, arangodb::Logger::FIXME) << "Request: "
<< std::string(_writeBuffer.c_str(), _writeBuffer.length());
if (_state == DEAD) {
_connection->resetNumConnectRetries();
}
// close connection to reset all read and write buffers
if (_state != FINISHED) {
this->close();
}
// we are connected, start with writing
if (_connection->isConnected()) {
_state = IN_WRITE;
_written = 0;
}
// connect to server
else {
_state = IN_CONNECT;
}
TRI_ASSERT(_state == IN_CONNECT || _state == IN_WRITE);
}
// -----------------------------------------------------------------------------
// private methods
// -----------------------------------------------------------------------------
void SimpleHttpClient::processHeader() {
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
size_t remain = _readBuffer.length() - _readBufferOffset;
char const* ptr = _readBuffer.c_str() + _readBufferOffset;
char const* pos = static_cast<char const*>(memchr(ptr, '\n', remain));
// We enforce the following invariants:
// ptr = _readBuffer.c_str() + _readBufferOffset
// _readBuffer.length() >= _readBufferOffset
// remain = _readBuffer.length() - _readBufferOffset
while (pos) {
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
TRI_ASSERT(ptr == _readBuffer.c_str() + _readBufferOffset);
TRI_ASSERT(remain == _readBuffer.length() - _readBufferOffset);
if (pos > ptr && *(pos - 1) == '\r') {
// adjust eol position
--pos;
}
// end of header found
if (*ptr == '\r' || *ptr == '\n' || *ptr == '\0') {
size_t len = pos - ptr;
_readBufferOffset += len + 1;
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
ptr += len + 1;
remain -= len + 1;
if (*pos == '\r') {
// adjust offset if line ended with \r\n
++_readBufferOffset;
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
ptr++;
remain--;
}
// handle chunks
if (_result->isChunked()) {
_state = IN_READ_CHUNKED_HEADER;
processChunkedHeader();
return;
}
// no content-length header in response
else if (!_result->hasContentLength()) {
_state = IN_READ_BODY;
processBody();
return;
}
// no body
else if (_result->hasContentLength() &&
_result->getContentLength() == 0) {
_result->setResultType(SimpleHttpResult::COMPLETE);
_state = FINISHED;
if (!_params._keepAlive) {
_connection->disconnect();
}
return;
}
// found content-length header in response
else if (_result->hasContentLength() && _result->getContentLength() > 0) {
if (_result->getContentLength() > _params._maxPacketSize) {
setErrorMessage("Content-Length > max packet size found", true);
// reset connection
this->close();
_state = DEAD;
return;
}
_state = IN_READ_BODY;
processBody();
return;
} else {
TRI_ASSERT(false);
}
break;
}
// we have found more header fields
else {
size_t len = pos - ptr;
_result->addHeaderField(ptr, len);
if (*pos == '\r') {
// adjust length if line ended with \r\n
// (header was already added so no harm is done)
++len;
}
// account for \n
ptr += len + 1;
_readBufferOffset += len + 1;
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
remain -= (len + 1);
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
TRI_ASSERT(ptr == _readBuffer.c_str() + _readBufferOffset);
TRI_ASSERT(remain == _readBuffer.length() - _readBufferOffset);
pos = static_cast<char const*>(memchr(ptr, '\n', remain));
}
}
}
void SimpleHttpClient::processBody() {
// HEAD requests may be responded to without a body...
if (_method == rest::RequestType::HEAD) {
_result->setResultType(SimpleHttpResult::COMPLETE);
_state = FINISHED;
if (!_params._keepAlive) {
_connection->disconnect();
}
return;
}
// we need to wait for a close, if content length is unknown
if (!_result->hasContentLength()) {
return;
}
// we need to wait for more data
if (_readBuffer.length() - _readBufferOffset < _result->getContentLength()) {
return;
}
// body is compressed using deflate. inflate it
if (_result->isDeflated()) {
_readBuffer.inflate(_result->getBody(), 16384, _readBufferOffset);
}
// body is not compressed
else {
// Note that if we are here, then
// _result->getContentLength() <= _readBuffer.length()-_readBufferOffset
_result->getBody().appendText(_readBuffer.c_str() + _readBufferOffset,
_result->getContentLength());
_result->getBody().ensureNullTerminated();
}
_readBufferOffset += _result->getContentLength();
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
_result->setResultType(SimpleHttpResult::COMPLETE);
_state = FINISHED;
if (!_params._keepAlive) {
_connection->disconnect();
}
}
void SimpleHttpClient::processChunkedHeader() {
size_t remain = _readBuffer.length() - _readBufferOffset;
char const* ptr = _readBuffer.c_str() + _readBufferOffset;
char const* pos = static_cast<char const*>(memchr(ptr, '\n', remain));
// not yet finished, newline is missing
if (pos == nullptr) {
return;
}
// adjust eol position
if (pos > ptr && *(pos - 1) == '\r') {
--pos;
}
size_t len = pos - (_readBuffer.c_str() + _readBufferOffset);
std::string line(_readBuffer.c_str() + _readBufferOffset, len);
StringUtils::trimInPlace(line);
_readBufferOffset += (len + 1);
// adjust offset if line ended with \r\n
if (*pos == '\r') {
++_readBufferOffset;
TRI_ASSERT(_readBufferOffset <= _readBuffer.length());
++len;
}
// empty lines are an error
if (line[0] == '\r' || line.empty()) {
setErrorMessage("found invalid content-length", true);
// reset connection
this->close();
_state = DEAD;
return;
}
uint32_t contentLength;
try {
contentLength = static_cast<uint32_t>(std::stol(line, nullptr, 16));
} catch (...) {
setErrorMessage("found invalid content-length", true);
// reset connection
this->close();
_state = DEAD;
return;
}
// failed: too many bytes
if (contentLength > _params._maxPacketSize) {
setErrorMessage("Content-Length > max packet size found!", true);
// reset connection
this->close();
_state = DEAD;
return;
}
_state = IN_READ_CHUNKED_BODY;
_nextChunkedSize = contentLength;
processChunkedBody();
}
void SimpleHttpClient::processChunkedBody() {
// HEAD requests may be responded to without a body...
if (_method == rest::RequestType::HEAD) {
_result->setResultType(SimpleHttpResult::COMPLETE);
_state = FINISHED;
if (!_params._keepAlive) {
_connection->disconnect();
}
return;
}
if (_readBuffer.length() - _readBufferOffset >= _nextChunkedSize + 2) {
// last chunk length was 0, therefore we are finished
if (_nextChunkedSize == 0) {
_result->setResultType(SimpleHttpResult::COMPLETE);
_state = FINISHED;
if (!_params._keepAlive) {
_connection->disconnect();
}
return;
}
if (_result->isDeflated()) {
_readBuffer.inflate(_result->getBody(), 16384, _readBufferOffset);
_result->getBody().ensureNullTerminated();
} else {
_result->getBody().appendText(_readBuffer.c_str() + _readBufferOffset,
(size_t)_nextChunkedSize);
_result->getBody().ensureNullTerminated();
}
_readBufferOffset += (size_t)_nextChunkedSize + 2;
_state = IN_READ_CHUNKED_HEADER;
processChunkedHeader();
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief extract an error message from a response
////////////////////////////////////////////////////////////////////////////////
std::string SimpleHttpClient::getHttpErrorMessage(
SimpleHttpResult const* result, int* errorCode) {
if (errorCode != nullptr) {
*errorCode = TRI_ERROR_NO_ERROR;
}
arangodb::basics::StringBuffer const& body = result->getBody();
std::string details;
try {
std::shared_ptr<VPackBuilder> builder =
VPackParser::fromJson(body.c_str(), body.length());
VPackSlice slice = builder->slice();
if (slice.isObject()) {
VPackSlice msg = slice.get("errorMessage");
int errorNum = slice.get("errorNum").getNumericValue<int>();
if (msg.isString() && msg.getStringLength() > 0 && errorNum > 0) {
if (errorCode != nullptr) {
*errorCode = errorNum;
}
details = ": ArangoError " + std::to_string(errorNum) + ": " +
msg.copyString();
}
}
} catch (...) {
// don't rethrow here. we'll respond with an error message anyway
}
return "got error from server: HTTP " +
std::to_string(result->getHttpReturnCode()) + " (" +
result->getHttpReturnMessage() + ")" + details;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief fetch the version from the server
////////////////////////////////////////////////////////////////////////////////
std::string SimpleHttpClient::getServerVersion(int* errorCode) {
if (errorCode != nullptr) {
*errorCode = TRI_ERROR_INTERNAL;
}
std::unique_ptr<SimpleHttpResult> response(
request(rest::RequestType::GET, "/_api/version", nullptr, 0));
if (response == nullptr || !response->isComplete()) {
return "";
}
if (response->getHttpReturnCode() ==
static_cast<int>(rest::ResponseCode::OK)) {
// default value
std::string version = "arango";
arangodb::basics::StringBuffer const& body = response->getBody();
try {
std::shared_ptr<VPackBuilder> builder =
VPackParser::fromJson(body.c_str(), body.length());
VPackSlice slice = builder->slice();
if (slice.isObject()) {
VPackSlice server = slice.get("server");
if (server.isString() && server.copyString() == "arango") {
// "server" value is a string and its content is "arango"
VPackSlice v = slice.get("version");
if (v.isString()) {
version = v.copyString();
}
}
}
if (errorCode != nullptr) {
*errorCode = TRI_ERROR_NO_ERROR;
}
return version;
} catch (std::exception const& ex) {
setErrorMessage(ex.what(), false);
return "";
} catch (...) {
setErrorMessage("Unable to parse server response", false);
return "";
}
}
if (response->wasHttpError()) {
std::string msg = getHttpErrorMessage(response.get(), errorCode);
setErrorMessage(msg, false);
}
_connection->disconnect();
return "";
}
}
}
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