merged a bunch of stuff

This commit is contained in:
CJ Cobb
2021-06-07 21:54:47 -04:00
parent 5f265c5850
commit a2dddbcb8a
11 changed files with 70 additions and 450 deletions

View File

@@ -1,5 +1,5 @@
#include <ripple/app/paths/RippleState.h>
#include <ripple/app/ledger/Ledger.h> #include <ripple/app/ledger/Ledger.h>
#include <ripple/app/paths/RippleState.h>
#include <ripple/basics/StringUtilities.h> #include <ripple/basics/StringUtilities.h>
#include <ripple/protocol/ErrorCodes.h> #include <ripple/protocol/ErrorCodes.h>
#include <ripple/protocol/Indexes.h> #include <ripple/protocol/Indexes.h>
@@ -104,19 +104,14 @@ doAccountObjects(
auto const addToResponse = [&](ripple::SLE const& sle) { auto const addToResponse = [&](ripple::SLE const& sle) {
if (!objectType || objectType == sle.getType()) if (!objectType || objectType == sle.getType())
{ {
jsonObjects.push_back(getJson(sle)); jsonObjects.push_back(toJson(sle));
} }
return true; return true;
}; };
auto nextCursor = auto nextCursor = traverseOwnedNodes(
traverseOwnedNodes( backend, accountID, *ledgerSequence, cursor, addToResponse);
backend,
accountID,
*ledgerSequence,
cursor,
addToResponse);
if (nextCursor) if (nextCursor)
response["next_cursor"] = ripple::strHex(*nextCursor); response["next_cursor"] = ripple::strHex(*nextCursor);

View File

@@ -104,6 +104,11 @@ toJson(ripple::SLE const& sle)
.count(); .count();
return value.as_object(); return value.as_object();
} }
boost::json::value
toBoostJson(RippledJson const& value)
{
return boost::json::parse(value.toStyledString());
}
boost::json::object boost::json::object
toJson(ripple::LedgerInfo const& lgrInfo) toJson(ripple::LedgerInfo const& lgrInfo)

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@@ -32,10 +32,11 @@ boost::json::object
toJson(ripple::LedgerInfo const& info); toJson(ripple::LedgerInfo const& info);
boost::json::object boost::json::object
getJson(ripple::TxMeta const& meta); toJson(ripple::TxMeta const& meta);
using RippledJson = Json::Value;
boost::json::value boost::json::value
getJson(Json::Value const& value); toBoostJson(RippledJson const& value);
std::optional<uint32_t> std::optional<uint32_t>
ledgerSequenceFromRequest( ledgerSequenceFromRequest(

View File

@@ -241,8 +241,7 @@ ReportingETL::publishLedger(uint32_t ledgerSequence, uint32_t maxAttempts)
} }
else else
{ {
auto lgr = auto lgr = backend_->fetchLedgerBySequence(ledgerSequence);
flatMapBackend_->fetchLedgerBySequence(ledgerSequence);
assert(lgr); assert(lgr);
publishLedger(*lgr); publishLedger(*lgr);
} }
@@ -574,7 +573,7 @@ ReportingETL::runETLPipeline(uint32_t startSequence, int numExtractors)
BOOST_LOG_TRIVIAL(info) << "Running online delete"; BOOST_LOG_TRIVIAL(info) << "Running online delete";
backend_->doOnlineDelete(*onlineDeleteInterval_); backend_->doOnlineDelete(*onlineDeleteInterval_);
BOOST_LOG_TRIVIAL(info) << "Finished online delete"; BOOST_LOG_TRIVIAL(info) << "Finished online delete";
auto rng = flatMapBackend_->fetchLedgerRangeNoThrow(); auto rng = backend_->fetchLedgerRangeNoThrow();
minSequence = rng->minSequence; minSequence = rng->minSequence;
deleting_ = false; deleting_ = false;
}); });

View File

@@ -276,7 +276,7 @@ private:
{ {
boost::json::object result; boost::json::object result;
result["etl_sources"] = loadBalancer_.toJson(); result["etl_sources"] = loadBalancer_->toJson();
result["is_writer"] = writing_.load(); result["is_writer"] = writing_.load();
result["read_only"] = readOnly_; result["read_only"] = readOnly_;
auto last = getLastPublish(); auto last = getLastPublish();

View File

@@ -1,5 +1,5 @@
#include<reporting/server/SubscriptionManager.h>
#include <handlers/RPCHelpers.h> #include <handlers/RPCHelpers.h>
#include <reporting/server/SubscriptionManager.h>
void void
SubscriptionManager::subLedger(std::shared_ptr<session>& session) SubscriptionManager::subLedger(std::shared_ptr<session>& session)
@@ -27,10 +27,10 @@ SubscriptionManager::pubLedger(
pubMsg["ledger_hash"] = to_string(lgrInfo.hash); pubMsg["ledger_hash"] = to_string(lgrInfo.hash);
pubMsg["ledger_time"] = lgrInfo.closeTime.time_since_epoch().count(); pubMsg["ledger_time"] = lgrInfo.closeTime.time_since_epoch().count();
pubMsg["fee_ref"] = getJson(fees.units.jsonClipped()); pubMsg["fee_ref"] = toBoostJson(fees.units.jsonClipped());
pubMsg["fee_base"] = getJson(fees.base.jsonClipped()); pubMsg["fee_base"] = toBoostJson(fees.base.jsonClipped());
pubMsg["reserve_base"] = getJson(fees.accountReserve(0).jsonClipped()); pubMsg["reserve_base"] = toBoostJson(fees.accountReserve(0).jsonClipped());
pubMsg["reserve_inc"] = getJson(fees.increment.jsonClipped()); pubMsg["reserve_inc"] = toBoostJson(fees.increment.jsonClipped());
pubMsg["validated_ledgers"] = ledgerRange; pubMsg["validated_ledgers"] = ledgerRange;
pubMsg["txn_count"] = txnCount; pubMsg["txn_count"] = txnCount;
@@ -75,8 +75,8 @@ SubscriptionManager::pubTransaction(
auto [tx, meta] = deserializeTxPlusMeta(blob, seq); auto [tx, meta] = deserializeTxPlusMeta(blob, seq);
boost::json::object pubMsg; boost::json::object pubMsg;
pubMsg["transaction"] = getJson(*tx); pubMsg["transaction"] = toJson(*tx);
pubMsg["meta"] = getJson(*meta); pubMsg["meta"] = toJson(*meta);
for (auto const& session : streamSubscribers_[Transactions]) for (auto const& session : streamSubscribers_[Transactions])
session->send(boost::json::serialize(pubMsg)); session->send(boost::json::serialize(pubMsg));
@@ -89,9 +89,9 @@ SubscriptionManager::pubTransaction(
session->send(boost::json::serialize(pubMsg)); session->send(boost::json::serialize(pubMsg));
} }
void void
SubscriptionManager::forwardProposedTransaction(boost::json::object const& response) SubscriptionManager::forwardProposedTransaction(
boost::json::object const& response)
{ {
for (auto const& session : streamSubscribers_[TransactionsProposed]) for (auto const& session : streamSubscribers_[TransactionsProposed])
session->send(boost::json::serialize(response)); session->send(boost::json::serialize(response));
@@ -127,7 +127,8 @@ SubscriptionManager::subProposedTransactions(std::shared_ptr<session>& session)
} }
void void
SubscriptionManager::unsubProposedTransactions(std::shared_ptr<session>& session) SubscriptionManager::unsubProposedTransactions(
std::shared_ptr<session>& session)
{ {
streamSubscribers_[TransactionsProposed].erase(session); streamSubscribers_[TransactionsProposed].erase(session);
} }

View File

@@ -48,10 +48,11 @@ public:
boost::asio::ip::tcp::endpoint endpoint, boost::asio::ip::tcp::endpoint endpoint,
std::shared_ptr<BackendInterface> backend, std::shared_ptr<BackendInterface> backend,
std::shared_ptr<SubscriptionManager> subscriptions, std::shared_ptr<SubscriptionManager> subscriptions,
std::shared_ptr<ETLLoadBalancer> balancer) std::shared_ptr<ETLLoadBalancer> balancer,
DOSGuard& dosGuard)
{ {
std::make_shared<listener>( std::make_shared<listener>(
ioc, endpoint, backend, subscriptions, balancer) ioc, endpoint, backend, subscriptions, balancer, dosGuard)
->run(); ->run();
} }
@@ -67,6 +68,7 @@ public:
, backend_(backend) , backend_(backend)
, subscriptions_(subscriptions) , subscriptions_(subscriptions)
, balancer_(balancer) , balancer_(balancer)
, dosGuard_(dosGuard)
{ {
boost::beast::error_code ec; boost::beast::error_code ec;

View File

@@ -20,20 +20,20 @@ buildResponse(
boost::json::object response; boost::json::object response;
if (shouldForwardToP2p(request)) if (shouldForwardToP2p(request))
return balancer->forwardToP2p(request); return {balancer->forwardToP2p(request), 10};
switch (commandMap[command]) switch (commandMap[command])
{ {
case tx: case tx:
return {doTx(request, *backend), 1}; return {doTx(request, *backend), 1};
case account_tx: { case account_tx: {
auto res = doAccountTx(request, backend); auto res = doAccountTx(request, *backend);
if (res.contains("transactions")) if (res.contains("transactions"))
return {res, res["transactions"].as_array().size()}; return {res, res["transactions"].as_array().size()};
return {res, 1}; return {res, 1};
} }
case ledger: { case ledger: {
auto res = doLedger(request, backend); auto res = doLedger(request, *backend);
if (res.contains("transactions")) if (res.contains("transactions"))
return {res, res["transactions"].as_array().size()}; return {res, res["transactions"].as_array().size()};
return {res, 1}; return {res, 1};
@@ -43,7 +43,7 @@ buildResponse(
case ledger_range: case ledger_range:
return {doLedgerRange(request, *backend), 1}; return {doLedgerRange(request, *backend), 1};
case ledger_data: { case ledger_data: {
auto res = doLedgerData(request, backend); auto res = doLedgerData(request, *backend);
if (res.contains("objects")) if (res.contains("objects"))
return {res, res["objects"].as_array().size() * 4}; return {res, res["objects"].as_array().size() * 4};
return {res, 1}; return {res, 1};
@@ -51,7 +51,7 @@ buildResponse(
case account_info: case account_info:
return {doAccountInfo(request, *backend), 1}; return {doAccountInfo(request, *backend), 1};
case book_offers: { case book_offers: {
auto res = doBookOffers(request, backend); auto res = doBookOffers(request, *backend);
if (res.contains("offers")) if (res.contains("offers"))
return {res, res["offers"].as_array().size() * 4}; return {res, res["offers"].as_array().size() * 4};
return {res, 1}; return {res, 1};
@@ -73,7 +73,7 @@ buildResponse(
size_t count = 1; size_t count = 1;
if (res.contains("send_currencies")) if (res.contains("send_currencies"))
count = res["send_currencies"].as_array().size(); count = res["send_currencies"].as_array().size();
if(res.contains("receive_currencies"])) if (res.contains("receive_currencies"))
count += res["receive_currencies"].as_array().size(); count += res["receive_currencies"].as_array().size();
return {res, count}; return {res, count};
} }
@@ -100,7 +100,7 @@ buildResponse(
case unsubscribe: case unsubscribe:
return {doUnsubscribe(request, session, *manager), 1}; return {doUnsubscribe(request, session, *manager), 1};
case server_info: { case server_info: {
return {doServerInfo(request, backend), 1}; return {doServerInfo(request, *backend), 1};
break; break;
} }
default: default:

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@@ -27,6 +27,7 @@
#include <reporting/BackendInterface.h> #include <reporting/BackendInterface.h>
#include <reporting/ETLSource.h> #include <reporting/ETLSource.h>
#include <reporting/server/SubscriptionManager.h> #include <reporting/server/SubscriptionManager.h>
#include <server/DOSGuard.h>
class session; class session;
class SubscriptionManager; class SubscriptionManager;
@@ -134,6 +135,10 @@ boost::json::object
doAccountObjects( doAccountObjects(
boost::json::object const& request, boost::json::object const& request,
BackendInterface const& backend); BackendInterface const& backend);
boost::json::object
doServerInfo(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object boost::json::object
doChannelAuthorize(boost::json::object const& request); doChannelAuthorize(boost::json::object const& request);
@@ -151,7 +156,7 @@ doUnsubscribe(
std::shared_ptr<session>& session, std::shared_ptr<session>& session,
SubscriptionManager& manager); SubscriptionManager& manager);
boost::json::object std::pair<boost::json::object, uint32_t>
buildResponse( buildResponse(
boost::json::object const& request, boost::json::object const& request,
std::shared_ptr<BackendInterface> backend, std::shared_ptr<BackendInterface> backend,

View File

@@ -32,386 +32,11 @@
#include <reporting/ReportingETL.h> #include <reporting/ReportingETL.h>
#include <reporting/server/listener.h> #include <reporting/server/listener.h>
#include <reporting/server/session.h> #include <reporting/server/session.h>
#include <server/DOSGuard.h>
#include <sstream> #include <sstream>
#include <string> #include <string>
#include <thread> #include <thread>
#include <vector> #include <vector>
<<<<<<< HEAD:websocket_server_async.cpp
=======
//------------------------------------------------------------------------------
enum RPCCommand {
tx,
account_tx,
ledger,
account_info,
ledger_data,
book_offers,
ledger_range,
ledger_entry,
server_info
};
std::unordered_map<std::string, RPCCommand> commandMap{
{"tx", tx},
{"account_tx", account_tx},
{"ledger", ledger},
{"ledger_range", ledger_range},
{"ledger_entry", ledger_entry},
{"account_info", account_info},
{"ledger_data", ledger_data},
{"book_offers", book_offers},
{"server_info", server_info}};
boost::json::object
doAccountInfo(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doTx(boost::json::object const& request, BackendInterface const& backend);
boost::json::object
doAccountTx(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doLedgerData(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doLedgerEntry(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doBookOffers(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doLedger(boost::json::object const& request, BackendInterface const& backend);
boost::json::object
doLedgerRange(
boost::json::object const& request,
BackendInterface const& backend);
boost::json::object
doServerInfo(
boost::json::object const& request,
BackendInterface const& backend);
std::pair<boost::json::object, uint32_t>
buildResponse(
boost::json::object const& request,
BackendInterface const& backend)
{
std::string command = request.at("command").as_string().c_str();
BOOST_LOG_TRIVIAL(info) << "Received rpc command : " << request;
boost::json::object response;
switch (commandMap[command])
{
case tx:
return {doTx(request, backend), 1};
break;
case account_tx: {
auto res = doAccountTx(request, backend);
if (res.contains("transactions"))
return {res, res["transactions"].as_array().size()};
return {res, 1};
}
break;
case ledger: {
auto res = doLedger(request, backend);
if (res.contains("transactions"))
return {res, res["transactions"].as_array().size()};
return {res, 1};
}
break;
case ledger_entry:
return {doLedgerEntry(request, backend), 1};
break;
case ledger_range:
return {doLedgerRange(request, backend), 1};
break;
case ledger_data: {
auto res = doLedgerData(request, backend);
if (res.contains("objects"))
return {res, res["objects"].as_array().size()};
return {res, 1};
}
break;
case server_info: {
return {doServerInfo(request, backend), 1};
break;
}
case account_info:
return {doAccountInfo(request, backend), 1};
break;
case book_offers: {
auto res = doBookOffers(request, backend);
if (res.contains("offers"))
return {res, res["offers"].as_array().size()};
return {res, 1};
}
break;
default:
BOOST_LOG_TRIVIAL(error) << "Unknown command: " << command;
}
return {response, 1};
}
// Report a failure
void
fail(boost::beast::error_code ec, char const* what)
{
std::cerr << what << ": " << ec.message() << "\n";
}
// Echoes back all received WebSocket messages
class session : public std::enable_shared_from_this<session>
{
boost::beast::websocket::stream<boost::beast::tcp_stream> ws_;
boost::beast::flat_buffer buffer_;
std::string response_;
BackendInterface const& backend_;
DOSGuard& dosGuard_;
public:
// Take ownership of the socket
explicit session(
boost::asio::ip::tcp::socket&& socket,
BackendInterface const& backend,
DOSGuard& dosGuard)
: ws_(std::move(socket)), backend_(backend), dosGuard_(dosGuard)
{
}
// Get on the correct executor
void
run()
{
// We need to be executing within a strand to perform async
// operations on the I/O objects in this session. Although not
// strictly necessary for single-threaded contexts, this example
// code is written to be thread-safe by default.
boost::asio::dispatch(
ws_.get_executor(),
boost::beast::bind_front_handler(
&session::on_run, shared_from_this()));
}
// Start the asynchronous operation
void
on_run()
{
// Set suggested timeout settings for the websocket
ws_.set_option(boost::beast::websocket::stream_base::timeout::suggested(
boost::beast::role_type::server));
// Set a decorator to change the Server of the handshake
ws_.set_option(boost::beast::websocket::stream_base::decorator(
[](boost::beast::websocket::response_type& res) {
res.set(
boost::beast::http::field::server,
std::string(BOOST_BEAST_VERSION_STRING) +
" websocket-server-async");
}));
// Accept the websocket handshake
ws_.async_accept(boost::beast::bind_front_handler(
&session::on_accept, shared_from_this()));
}
void
on_accept(boost::beast::error_code ec)
{
if (ec)
return fail(ec, "accept");
// Read a message
do_read();
}
void
do_read()
{
// Read a message into our buffer
ws_.async_read(
buffer_,
boost::beast::bind_front_handler(
&session::on_read, shared_from_this()));
}
void
on_read(boost::beast::error_code ec, std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
// This indicates that the session was closed
if (ec == boost::beast::websocket::error::closed)
return;
if (ec)
fail(ec, "read");
std::string msg{
static_cast<char const*>(buffer_.data().data()), buffer_.size()};
// BOOST_LOG_TRIVIAL(debug) << __func__ << msg;
boost::json::object response;
auto ip =
ws_.next_layer().socket().remote_endpoint().address().to_string();
BOOST_LOG_TRIVIAL(debug)
<< __func__ << " received request from ip = " << ip;
if (!dosGuard_.isOk(ip))
response["error"] = "Too many requests. Slow down";
else
{
try
{
boost::json::value raw = boost::json::parse(msg);
boost::json::object request = raw.as_object();
BOOST_LOG_TRIVIAL(debug) << " received request : " << request;
try
{
auto start = std::chrono::system_clock::now();
auto [res, cost] = buildResponse(request, backend_);
response = std::move(res);
if (!dosGuard_.add(ip, cost))
{
response["warning"] = "Too many requests";
}
auto end = std::chrono::system_clock::now();
BOOST_LOG_TRIVIAL(info)
<< __func__ << " RPC call took "
<< ((end - start).count() / 1000000000.0)
<< " . request = " << request;
}
catch (Backend::DatabaseTimeout const& t)
{
BOOST_LOG_TRIVIAL(error) << __func__ << " Database timeout";
response["error"] =
"Database read timeout. Please retry the request";
}
}
catch (std::exception const& e)
{
BOOST_LOG_TRIVIAL(error)
<< __func__ << "caught exception : " << e.what();
response["error"] = "Unknown exception";
}
}
BOOST_LOG_TRIVIAL(trace) << __func__ << response;
response_ = boost::json::serialize(response);
// Echo the message
ws_.text(ws_.got_text());
ws_.async_write(
boost::asio::buffer(response_),
boost::beast::bind_front_handler(
&session::on_write, shared_from_this()));
}
void
on_write(boost::beast::error_code ec, std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if (ec)
return fail(ec, "write");
// Clear the buffer
buffer_.consume(buffer_.size());
// Do another read
do_read();
}
};
//------------------------------------------------------------------------------
// Accepts incoming connections and launches the sessions
class listener : public std::enable_shared_from_this<listener>
{
boost::asio::io_context& ioc_;
boost::asio::ip::tcp::acceptor acceptor_;
BackendInterface const& backend_;
DOSGuard& dosGuard_;
public:
listener(
boost::asio::io_context& ioc,
boost::asio::ip::tcp::endpoint endpoint,
BackendInterface const& backend,
DOSGuard& dosGuard)
: ioc_(ioc), acceptor_(ioc), backend_(backend), dosGuard_(dosGuard)
{
boost::beast::error_code ec;
// Open the acceptor
acceptor_.open(endpoint.protocol(), ec);
if (ec)
{
fail(ec, "open");
return;
}
// Allow address reuse
acceptor_.set_option(boost::asio::socket_base::reuse_address(true), ec);
if (ec)
{
fail(ec, "set_option");
return;
}
// Bind to the server address
acceptor_.bind(endpoint, ec);
if (ec)
{
fail(ec, "bind");
return;
}
// Start listening for connections
acceptor_.listen(boost::asio::socket_base::max_listen_connections, ec);
if (ec)
{
fail(ec, "listen");
return;
}
}
// Start accepting incoming connections
void
run()
{
do_accept();
}
private:
void
do_accept()
{
// The new connection gets its own strand
acceptor_.async_accept(
boost::asio::make_strand(ioc_),
boost::beast::bind_front_handler(
&listener::on_accept, shared_from_this()));
}
void
on_accept(boost::beast::error_code ec, boost::asio::ip::tcp::socket socket)
{
if (ec)
{
fail(ec, "accept");
}
else
{
// Create the session and run it
std::make_shared<session>(std::move(socket), backend_, dosGuard_)
->run();
}
// Accept another connection
do_accept();
}
};
>>>>>>> dev:server/websocket_server_async.cpp
std::optional<boost::json::object> std::optional<boost::json::object>
parse_config(const char* filename) parse_config(const char* filename)
{ {
@@ -515,34 +140,20 @@ main(int argc, char* argv[])
// The io_context is required for all I/O // The io_context is required for all I/O
boost::asio::io_context ioc{threads}; boost::asio::io_context ioc{threads};
<<<<<<< HEAD:websocket_server_async.cpp
DOSGuard dosGuard{config.value(), ioc};
std::shared_ptr<BackendInterface> backend{Backend::make_Backend(*config)}; std::shared_ptr<BackendInterface> backend{Backend::make_Backend(*config)};
std::shared_ptr<SubscriptionManager> subscriptions{ std::shared_ptr<SubscriptionManager> subscriptions{
SubscriptionManager::make_SubscriptionManager()}; SubscriptionManager::make_SubscriptionManager()};
=======
ReportingETL etl{config.value(), ioc};
DOSGuard dosGuard{config.value(), ioc};
>>>>>>> dev:server/websocket_server_async.cpp
std::shared_ptr<NetworkValidatedLedgers> ledgers{ std::shared_ptr<NetworkValidatedLedgers> ledgers{
NetworkValidatedLedgers::make_ValidatedLedgers()}; NetworkValidatedLedgers::make_ValidatedLedgers()};
std::shared_ptr<ETLLoadBalancer> balancer{ std::shared_ptr<ETLLoadBalancer> balancer{
ETLLoadBalancer::make_ETLLoadBalancer( ETLLoadBalancer::make_ETLLoadBalancer(
*config, *config, ioc, backend, subscriptions, ledgers)};
ioc,
<<<<<<< HEAD:websocket_server_async.cpp
backend,
subscriptions,
ledgers)};
=======
boost::asio::ip::tcp::endpoint{address, port},
etl.getFlatMapBackend(),
dosGuard)
->run();
>>>>>>> dev:server/websocket_server_async.cpp
std::shared_ptr<ReportingETL> etl{ReportingETL::make_ReportingETL( std::shared_ptr<ReportingETL> etl{ReportingETL::make_ReportingETL(
*config, ioc, backend, subscriptions, balancer, ledgers)}; *config, ioc, backend, subscriptions, balancer, ledgers)};
@@ -552,7 +163,8 @@ main(int argc, char* argv[])
boost::asio::ip::tcp::endpoint{address, port}, boost::asio::ip::tcp::endpoint{address, port},
backend, backend,
subscriptions, subscriptions,
balancer); balancer,
dosGuard);
// Blocks until stopped. // Blocks until stopped.
// When stopped, shared_ptrs fall out of scope // When stopped, shared_ptrs fall out of scope

View File

@@ -45,7 +45,7 @@ TEST(BackendTest, Basic)
for (auto& config : configs) for (auto& config : configs)
{ {
std::cout << keyspace << std::endl; std::cout << keyspace << std::endl;
auto backend = Backend::makeBackend(config); auto backend = Backend::make_Backend(config);
backend->open(false); backend->open(false);
std::string rawHeader = std::string rawHeader =