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foundationdb/flow/network.h

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/*
* network.h
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* 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.
*/
#ifndef FLOW_OPENNETWORK_H
#define FLOW_OPENNETWORK_H
#pragma once
#include <array>
#include <string>
#include <stdint.h>
#include <variant>
#include "boost/asio.hpp"
#ifndef TLS_DISABLED
#include "boost/asio/ssl.hpp"
#endif
#include "flow/serialize.h"
#include "flow/IRandom.h"
enum class TaskPriority {
Max = 1000000,
RunLoop = 30000,
ASIOReactor = 20001,
RunCycleFunction = 20000,
FlushTrace = 10500,
WriteSocket = 10000,
PollEIO = 9900,
DiskIOComplete = 9150,
LoadBalancedEndpoint = 9000,
ReadSocket = 9000,
AcceptSocket = 8950,
Handshake = 8900,
CoordinationReply = 8810,
Coordination = 8800,
FailureMonitor = 8700,
ResolutionMetrics = 8700,
Worker = 8660,
ClusterControllerWorker = 8656,
ClusterControllerRecruit = 8654,
ClusterControllerRegister = 8652,
ClusterController = 8650,
MasterTLogRejoin = 8646,
ProxyStorageRejoin = 8645,
TLogQueuingMetrics = 8620,
TLogPop = 8610,
TLogPeekReply = 8600,
TLogPeek = 8590,
TLogCommitReply = 8580,
TLogCommit = 8570,
ProxyGetRawCommittedVersion = 8565,
ProxyMasterVersionReply = 8560,
ProxyCommitYield2 = 8557,
ProxyTLogCommitReply = 8555,
ProxyCommitYield1 = 8550,
ProxyResolverReply = 8547,
ProxyCommit = 8545,
ProxyCommitBatcher = 8540,
TLogConfirmRunningReply = 8530,
TLogConfirmRunning = 8520,
ProxyGRVTimer = 8510,
GetConsistentReadVersion = 8500,
DefaultPromiseEndpoint = 8000,
DefaultOnMainThread = 7500,
DefaultDelay = 7010,
DefaultYield = 7000,
DiskRead = 5010,
DefaultEndpoint = 5000,
UnknownEndpoint = 4000,
MoveKeys = 3550,
DataDistributionLaunch = 3530,
Ratekeeper = 3510,
DataDistribution = 3502,
DataDistributionLow = 3501,
DataDistributionVeryLow = 3500,
DiskWrite = 3010,
UpdateStorage = 3000,
CompactCache = 2900,
TLogSpilledPeekReply = 2800,
FetchKeys = 2500,
RestoreApplierWriteDB = 2400,
RestoreApplierReceiveMutations = 2310,
RestoreLoaderSendMutations = 2300,
RestoreLoaderLoadFiles = 2200,
Low = 2000,
Min = 1000,
Zero = 0
};
// These have been given long, annoying names to discourage their use.
inline TaskPriority incrementPriority(TaskPriority p) {
return static_cast<TaskPriority>( static_cast<uint64_t>(p) + 1 );
}
inline TaskPriority decrementPriority(TaskPriority p) {
return static_cast<TaskPriority>( static_cast<uint64_t>(p) - 1 );
}
inline TaskPriority incrementPriorityIfEven(TaskPriority p) {
return static_cast<TaskPriority>( static_cast<uint64_t>(p) | 1 );
}
class Void;
template<class T> class Optional;
struct IPAddress {
typedef boost::asio::ip::address_v6::bytes_type IPAddressStore;
static_assert(std::is_same<IPAddressStore, std::array<uint8_t, 16>>::value,
"IPAddressStore must be std::array<uint8_t, 16>");
private:
struct IsV6Visitor : boost::static_visitor<> {
bool result = false;
void operator() (const IPAddressStore&) { result = true; }
void operator() (const uint32_t&) { result = false; }
};
public:
// Represents both IPv4 and IPv6 address. For IPv4 addresses,
// only the first 32bits are relevant and rest are initialized to
// 0.
IPAddress() : addr(uint32_t(0)) {}
explicit IPAddress(const IPAddressStore& v6addr) : addr(v6addr) {}
explicit IPAddress(uint32_t v4addr) : addr(v4addr) {}
bool isV6() const {
IsV6Visitor visitor;
boost::apply_visitor(visitor, addr);
return visitor.result;
}
bool isV4() const { return !isV6(); }
bool isValid() const;
// Returns raw v4/v6 representation of address. Caller is responsible
// to call these functions safely.
uint32_t toV4() const { return boost::get<uint32_t>(addr); }
const IPAddressStore& toV6() const { return boost::get<IPAddressStore>(addr); }
std::string toString() const;
static Optional<IPAddress> parse(std::string str);
bool operator==(const IPAddress& addr) const;
bool operator!=(const IPAddress& addr) const;
bool operator<(const IPAddress& addr) const;
template <class Ar>
void serialize(Ar& ar) {
if constexpr (is_fb_function<Ar>) {
serializer(ar, addr);
} else {
if (Ar::isDeserializing) {
bool v6;
serializer(ar, v6);
if (v6) {
IPAddressStore store;
serializer(ar, store);
addr = store;
} else {
uint32_t res;
serializer(ar, res);
addr = res;
}
} else {
bool v6 = isV6();
serializer(ar, v6);
if (v6) {
auto res = toV6();
serializer(ar, res);
} else {
auto res = toV4();
serializer(ar, res);
}
}
}
}
private:
boost::variant<uint32_t, IPAddressStore> addr;
};
template<>
struct Traceable<IPAddress> : std::true_type {
static std::string toString(const IPAddress& value) {
return value.toString();
}
};
struct NetworkAddress {
constexpr static FileIdentifier file_identifier = 14155727;
// A NetworkAddress identifies a particular running server (i.e. a TCP endpoint).
IPAddress ip;
uint16_t port;
uint16_t flags;
enum { FLAG_PRIVATE = 1, FLAG_TLS = 2 };
NetworkAddress() : ip(IPAddress(0)), port(0), flags(FLAG_PRIVATE) {}
NetworkAddress(const IPAddress& address, uint16_t port, bool isPublic, bool isTLS)
: ip(address), port(port), flags((isPublic ? 0 : FLAG_PRIVATE) | (isTLS ? FLAG_TLS : 0)) {}
NetworkAddress(uint32_t ip, uint16_t port, bool isPublic, bool isTLS)
: NetworkAddress(IPAddress(ip), port, isPublic, isTLS) {}
NetworkAddress(uint32_t ip, uint16_t port) : NetworkAddress(ip, port, false, false) {}
NetworkAddress(const IPAddress& ip, uint16_t port) : NetworkAddress(ip, port, false, false) {}
bool operator==(NetworkAddress const& r) const { return ip == r.ip && port == r.port && flags == r.flags; }
bool operator!=(NetworkAddress const& r) const { return ip != r.ip || port != r.port || flags != r.flags; }
bool operator<(NetworkAddress const& r) const {
if (flags != r.flags)
return flags < r.flags;
else if (ip != r.ip)
return ip < r.ip;
return port < r.port;
}
bool isValid() const { return ip.isValid() || port != 0; }
bool isPublic() const { return !(flags & FLAG_PRIVATE); }
bool isTLS() const { return (flags & FLAG_TLS) != 0; }
bool isV6() const { return ip.isV6(); }
static NetworkAddress parse(std::string const&); // May throw connection_string_invalid
static Optional<NetworkAddress> parseOptional(std::string const&);
static std::vector<NetworkAddress> parseList( std::string const& );
std::string toString() const;
template <class Ar>
void serialize(Ar& ar) {
if constexpr (is_fb_function<Ar>) {
serializer(ar, ip, port, flags);
} else {
if (ar.isDeserializing && !ar.protocolVersion().hasIPv6()) {
uint32_t ipV4;
serializer(ar, ipV4, port, flags);
ip = IPAddress(ipV4);
} else {
serializer(ar, ip, port, flags);
}
}
}
};
template<>
struct Traceable<NetworkAddress> : std::true_type {
static std::string toString(const NetworkAddress& value) {
return value.toString();
}
};
namespace std
{
template <>
struct hash<NetworkAddress>
{
size_t operator()(const NetworkAddress& na) const
{
size_t result = 0;
if (na.ip.isV6()) {
uint16_t* ptr = (uint16_t*)na.ip.toV6().data();
result = ((size_t)ptr[5] << 32) | ((size_t)ptr[6] << 16) | ptr[7];
} else {
result = na.ip.toV4();
}
return (result << 16) + na.port;
}
};
}
struct NetworkAddressList {
NetworkAddress address;
Optional<NetworkAddress> secondaryAddress;
bool operator==(NetworkAddressList const& r) const { return address == r.address && secondaryAddress == r.secondaryAddress; }
bool operator!=(NetworkAddressList const& r) const { return address != r.address || secondaryAddress != r.secondaryAddress; }
bool operator<(NetworkAddressList const& r) const {
if (address != r.address)
return address < r.address;
return secondaryAddress < r.secondaryAddress;
}
NetworkAddress getTLSAddress() const {
if(!secondaryAddress.present() || address.isTLS()) {
return address;
}
return secondaryAddress.get();
}
std::string toString() const {
if(!secondaryAddress.present()) {
return address.toString();
}
return address.toString() + ", " + secondaryAddress.get().toString();
}
template <class Ar>
void serialize(Ar& ar) {
serializer(ar, address, secondaryAddress);
}
};
std::string toIPVectorString(std::vector<uint32_t> ips);
std::string toIPVectorString(const std::vector<IPAddress>& ips);
std::string formatIpPort(const IPAddress& ip, uint16_t port);
template <class T> class Future;
template <class T> class Promise;
struct NetworkMetrics {
enum { SLOW_EVENT_BINS = 16 };
uint64_t countSlowEvents[SLOW_EVENT_BINS] = {};
double secSquaredSubmit = 0;
double secSquaredDiskStall = 0;
struct PriorityStats {
TaskPriority priority;
bool active = false;
double duration = 0;
double timer = 0;
double windowedTimer = 0;
double maxDuration = 0;
PriorityStats(TaskPriority priority) : priority(priority) {}
};
std::unordered_map<TaskPriority, struct PriorityStats> activeTrackers;
std::vector<struct PriorityStats> starvationTrackers;
static const std::vector<int> starvationBins;
NetworkMetrics() {
for(int priority : starvationBins) {
starvationTrackers.emplace_back(static_cast<TaskPriority>(priority));
}
}
};
struct BoundedFlowLock;
struct NetworkInfo {
NetworkMetrics metrics;
double oldestAlternativesFailure = 0;
double newestAlternativesFailure = 0;
double lastAlternativesFailureSkipDelay = 0;
std::map<std::pair<IPAddress, uint16_t>, std::pair<int,double>> serverTLSConnectionThrottler;
BoundedFlowLock* handshakeLock;
NetworkInfo();
};
class IEventFD : public ReferenceCounted<IEventFD> {
public:
virtual ~IEventFD() {}
virtual int getFD() = 0;
virtual Future<int64_t> read() = 0;
};
class IConnection {
public:
// IConnection is reference-counted (use Reference<IConnection>), but the caller must explicitly call close()
virtual void addref() = 0;
virtual void delref() = 0;
// Closes the underlying connection eventually if it is not already closed.
virtual void close() = 0;
virtual Future<Void> acceptHandshake() = 0;
virtual Future<Void> connectHandshake() = 0;
// returns when write() can write at least one byte (or may throw an error if the connection dies)
virtual Future<Void> onWritable() = 0;
// returns when read() can read at least one byte (or may throw an error if the connection dies)
virtual Future<Void> onReadable() = 0;
// Reads as many bytes as possible from the read buffer into [begin,end) and returns the number of bytes read (might be 0)
// (or may throw an error if the connection dies)
virtual int read( uint8_t* begin, uint8_t* end ) = 0;
// Writes as many bytes as possible from the given SendBuffer chain into the write buffer and returns the number of bytes written (might be 0)
// (or may throw an error if the connection dies)
// The SendBuffer chain cannot be empty, and the limit must be positive.
// Important non-obvious behavior: The caller is committing to write the contents of the buffer chain up to the limit. If all of those bytes could
// not be sent in this call to write() then further calls must be made to write the remainder. An IConnection implementation can make decisions
// based on the entire byte set that the caller was attempting to write even if it is unable to write all of it immediately.
// Due to limitations of TLSConnection, callers must also avoid reallocations that reduce the amount of written data in the first buffer in the chain.
virtual int write( SendBuffer const* buffer, int limit = std::numeric_limits<int>::max()) = 0;
// Returns the network address and port of the other end of the connection. In the case of an incoming connection, this may not
// be an address we can connect to!
virtual NetworkAddress getPeerAddress() = 0;
virtual UID getDebugID() = 0;
};
class IListener {
public:
virtual void addref() = 0;
virtual void delref() = 0;
// Returns one incoming connection when it is available. Do not cancel unless you are done with the listener!
virtual Future<Reference<IConnection>> accept() = 0;
virtual NetworkAddress getListenAddress() = 0;
};
typedef void* flowGlobalType;
typedef NetworkAddress (*NetworkAddressFuncPtr)();
typedef NetworkAddressList (*NetworkAddressesFuncPtr)();
class TLSConfig;
class INetwork;
extern INetwork* g_network;
extern INetwork* newNet2(const TLSConfig& tlsConfig, bool useThreadPool = false, bool useMetrics = false);
class INetwork {
public:
// This interface abstracts the physical or simulated network, event loop and hardware that FoundationDB is running on.
// Note that there are tools for disk access, scheduling, etc as well as networking, and that almost all access
// to the network should be through FlowTransport, not directly through these low level interfaces!
enum enumGlobal {
enFailureMonitor = 0,
enFlowTransport = 1,
enTDMetrics = 2,
enNetworkConnections = 3,
enNetworkAddressFunc = 4,
enFileSystem = 5,
enASIOService = 6,
enEventFD = 7,
enRunCycleFunc = 8,
enASIOTimedOut = 9,
enBlobCredentialFiles = 10,
enNetworkAddressesFunc = 11,
enClientFailureMonitor = 12
};
virtual void longTaskCheck( const char* name ) {}
virtual double now() = 0;
// Provides a clock that advances at a similar rate on all connected endpoints
// FIXME: Return a fixed point Time class
virtual double timer() = 0;
// A wrapper for directly getting the system time. The time returned by now() only updates in the run loop,
// so it cannot be used to measure times of functions that do not have wait statements.
virtual Future<class Void> delay( double seconds, TaskPriority taskID ) = 0;
// The given future will be set after seconds have elapsed
virtual Future<class Void> yield( TaskPriority taskID ) = 0;
// The given future will be set immediately or after higher-priority tasks have executed
virtual bool check_yield( TaskPriority taskID ) = 0;
// Returns true if a call to yield would result in a delay
virtual TaskPriority getCurrentTask() = 0;
// Gets the taskID/priority of the current task
virtual void setCurrentTask(TaskPriority taskID ) = 0;
// Sets the taskID/priority of the current task, without yielding
virtual flowGlobalType global(int id) = 0;
virtual void setGlobal(size_t id, flowGlobalType v) = 0;
virtual void stop() = 0;
// Terminate the program
virtual void addStopCallback( std::function<void()> fn ) = 0;
// Calls `fn` when stop() is called.
// addStopCallback can be called more than once, and each added `fn` will be run once.
virtual bool isSimulated() const = 0;
// Returns true if this network is a local simulation
virtual bool isOnMainThread() const = 0;
// Returns true if the current thread is the main thread
virtual void onMainThread( Promise<Void>&& signal, TaskPriority taskID ) = 0;
// Executes signal.send(Void()) on a/the thread belonging to this network
virtual THREAD_HANDLE startThread( THREAD_FUNC_RETURN (*func) (void *), void *arg) = 0;
// Starts a thread and returns a handle to it
virtual void run() = 0;
// Devotes this thread to running the network (generally until stop())
virtual void initMetrics() {}
// Metrics must be initialized after FlowTransport::createInstance has been called
virtual void initTLS() {}
// TLS must be initialized before using the network
virtual const TLSConfig& getTLSConfig() = 0;
// Return the TLS Configuration
virtual void getDiskBytes( std::string const& directory, int64_t& free, int64_t& total) = 0;
//Gets the number of free and total bytes available on the disk which contains directory
virtual bool isAddressOnThisHost( NetworkAddress const& addr ) = 0;
// Returns true if it is reasonably certain that a connection to the given address would be a fast loopback connection
// Shorthand for transport().getLocalAddress()
static NetworkAddress getLocalAddress()
{
flowGlobalType netAddressFuncPtr = reinterpret_cast<flowGlobalType>(g_network->global(INetwork::enNetworkAddressFunc));
return (netAddressFuncPtr) ? reinterpret_cast<NetworkAddressFuncPtr>(netAddressFuncPtr)() : NetworkAddress();
}
// Shorthand for transport().getLocalAddresses()
static NetworkAddressList getLocalAddresses()
{
flowGlobalType netAddressesFuncPtr = reinterpret_cast<flowGlobalType>(g_network->global(INetwork::enNetworkAddressesFunc));
return (netAddressesFuncPtr) ? reinterpret_cast<NetworkAddressesFuncPtr>(netAddressesFuncPtr)() : NetworkAddressList();
}
NetworkInfo networkInfo;
protected:
INetwork() {}
~INetwork() {} // Please don't try to delete through this interface!
};
class INetworkConnections {
public:
// Methods for making and accepting network connections. Logically this is part of the INetwork abstraction
// that abstracts all interaction with the physical world; it is separated out to make it easy for e.g. transport
// security to override only these operations without having to delegate everything in INetwork.
// Make an outgoing connection to the given address. May return an error or block indefinitely in case of connection problems!
virtual Future<Reference<IConnection>> connect( NetworkAddress toAddr, std::string host = "") = 0;
// Resolve host name and service name (such as "http" or can be a plain number like "80") to a list of 1 or more NetworkAddresses
virtual Future<std::vector<NetworkAddress>> resolveTCPEndpoint( std::string host, std::string service ) = 0;
// Convenience function to resolve host/service and connect to one of its NetworkAddresses randomly
// useTLS has to be a parameter here because it is passed to connect() as part of the toAddr object.
virtual Future<Reference<IConnection>> connect( std::string host, std::string service, bool useTLS = false);
// Listen for connections on the given local address
virtual Reference<IListener> listen( NetworkAddress localAddr ) = 0;
static INetworkConnections* net() { return static_cast<INetworkConnections*>((void*) g_network->global(INetwork::enNetworkConnections)); }
// Returns the interface that should be used to make and accept socket connections
};
#endif
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