Browse Source
Continues Johnathan Corgan's work. Publishing multipart messages Bugfix: Add missing zmq header includes Bugfix: Adjust build system to link ZeroMQ code for Qt binaries0.13
Jeff Garzik
10 years ago
committed by
João Barbosa
16 changed files with 717 additions and 4 deletions
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#!/usr/bin/env python2 |
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import array |
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import binascii |
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import zmq |
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port = 28332 |
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zmqContext = zmq.Context() |
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zmqSubSocket = zmqContext.socket(zmq.SUB) |
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zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashblock") |
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zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "hashtx") |
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zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawblock") |
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zmqSubSocket.setsockopt(zmq.SUBSCRIBE, "rawtx") |
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zmqSubSocket.connect("tcp://127.0.0.1:%i" % port) |
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try: |
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while True: |
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msg = zmqSubSocket.recv_multipart() |
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topic = str(msg[0]) |
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body = msg[1] |
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if topic == "hashblock": |
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print "- HASH BLOCK -" |
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print binascii.hexlify(body) |
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elif topic == "hashtx": |
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print '- HASH TX -' |
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print binascii.hexlify(body) |
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elif topic == "rawblock": |
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print "- RAW BLOCK HEADER -" |
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print binascii.hexlify(body[:80]) |
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elif topic == "rawtx": |
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print '- RAW TX -' |
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print binascii.hexlify(body) |
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except KeyboardInterrupt: |
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zmqContext.destroy() |
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# Block and Transaction Broadcasting With ZeroMQ |
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[ZeroMQ](http://zeromq.org/) is a lightweight wrapper around TCP |
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connections, inter-process communications, and shared-memory, |
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providing various message-oriented semantics such as publish/subcribe, |
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request/reply, and push/pull. |
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The Bitcoin Core daemon can be configured to act as a trusted "border |
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router", implementing the bitcoin wire protocol and relay, making |
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consensus decisions, maintaining the local blockchain database, |
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broadcasting locally generated transactions into the network, and |
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providing a queryable RPC interface to interact on a polled basis for |
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requesting blockchain related data. However, there exists only a |
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limited service to notify external software of events like the arrival |
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of new blocks or transactions. |
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The ZeroMQ facility implements a notification interface through a |
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set of specific notifiers. Currently there are notifiers that publish |
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blocks and transactions. This read-only facility requires only the |
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connection of a corresponding ZeroMQ subscriber port in receiving |
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software; it is not authenticated nor is there any two-way protocol |
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involvement. Therefore, subscribers should validate the received data |
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since it may be out of date, incomplete or even invalid. |
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|
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ZeroMQ sockets are self-connecting and self-healing; that is, connects |
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made between two endpoints will be automatically restored after an |
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outage, and either end may be freely started or stopped in any order. |
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|
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Because ZeroMQ is message oriented, subscribers receive transactions |
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and blocks all-at-once and do not need to implement any sort of |
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buffering or reassembly. |
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|
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## Prerequisites |
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The ZeroMQ feature in Bitcoin Core uses only a very small part of the |
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ZeroMQ C API, and is thus compatible with any version of ZeroMQ |
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from 2.1 onward, including all versions in the 3.x and 4.x release |
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series. Typically, it is packaged by distributions as something like |
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*libzmq-dev*. |
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The C++ wrapper for ZeroMQ is *not* needed. |
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## Enabling |
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By default, the ZeroMQ port functionality is enabled. Two steps are |
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required to enable--compiling in the ZeroMQ code, and configuring |
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runtime operation on the command-line or configuration file. |
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$ ./configure --enable-zmq (other options) |
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This will produce a binary that is capable of providing the ZeroMQ |
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facility, but will not do so until also configured properly. |
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## Usage |
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Currently, the following notifications are supported: |
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-zmqpubhashtx=address |
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-zmqpubhashblock=address |
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-zmqpubrawblock=address |
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-zmqpubrawtx=address |
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The socket type is PUB and the address must be a valid ZeroMQ |
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socket address. The same address can be used in more than one notification. |
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For instance: |
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$ bitcoind -zmqpubhashtx=tcp://127.0.0.1:28332 -zmqpubrawtx=ipc:///tmp/bitcoind.tx.raw |
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Each PUB notification has a topic and body, where the header |
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corresponds to the notification type. For instance, for the notification |
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`-zmqpubhashtx` the topic is `hashtx` (no null terminator) and the body is the |
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hexadecimal transaction hash (32 bytes). |
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These options can also be provided in bitcoin.conf. |
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ZeroMQ endpoint specifiers for TCP (and others) are documented in the |
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[ZeroMQ API](http://api.zeromq.org). |
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Client side, then, the ZeroMQ subscriber socket must have the |
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ZMQ_SUBSCRIBE option set to one or either of these prefixes (for instance, just `hash`); without |
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doing so will result in no messages arriving. Please see `contrib/zmq/zmq_sub.py` |
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for a working example. |
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## Remarks |
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From the perspective of bitcoind, the ZeroMQ socket is write-only; PUB |
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sockets don't even have a read function. Thus, there is no state |
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introduced into bitcoind directly. Furthermore, no information is |
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broadcast that wasn't already received from the public P2P network. |
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No authentication or authorization is done on connecting clients; it |
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is assumed that the ZeroMQ port is exposed only to trusted entities, |
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using other means such as firewalling. |
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Note that when the block chain tip changes, a reorganisation may occur and just |
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the tip will be notified. It is up to the subscriber to retrieve the chain |
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from the last known block to the new tip. |
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "zmqabstractnotifier.h" |
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#include "util.h" |
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CZMQAbstractNotifier::~CZMQAbstractNotifier() |
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{ |
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assert(!psocket); |
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} |
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bool CZMQAbstractNotifier::NotifyBlock(const uint256 &/*hash*/) |
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{ |
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return true; |
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} |
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bool CZMQAbstractNotifier::NotifyTransaction(const CTransaction &/*transaction*/) |
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{ |
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return true; |
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} |
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_ZMQ_ZMQABSTRACTNOTIFIER_H |
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#define BITCOIN_ZMQ_ZMQABSTRACTNOTIFIER_H |
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#include "zmqconfig.h" |
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class CZMQAbstractNotifier; |
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typedef CZMQAbstractNotifier* (*CZMQNotifierFactory)(); |
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class CZMQAbstractNotifier |
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{ |
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public: |
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CZMQAbstractNotifier() : psocket(0) { } |
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virtual ~CZMQAbstractNotifier(); |
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template <typename T> |
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static CZMQAbstractNotifier* Create() |
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{ |
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return new T(); |
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} |
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std::string GetType() const { return type; } |
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void SetType(const std::string &t) { type = t; } |
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std::string GetAddress() const { return address; } |
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void SetAddress(const std::string &a) { address = a; } |
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virtual bool Initialize(void *pcontext) = 0; |
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virtual void Shutdown() = 0; |
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virtual bool NotifyBlock(const uint256 &hash); |
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virtual bool NotifyTransaction(const CTransaction &transaction); |
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protected: |
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void *psocket; |
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std::string type; |
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std::string address; |
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}; |
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#endif // BITCOIN_ZMQ_ZMQABSTRACTNOTIFIER_H
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_ZMQ_ZMQCONFIG_H |
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#define BITCOIN_ZMQ_ZMQCONFIG_H |
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#if defined(HAVE_CONFIG_H) |
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#include "config/bitcoin-config.h" |
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#endif |
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#include <stdarg.h> |
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#include <string> |
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#if ENABLE_ZMQ |
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#include <zmq.h> |
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#endif |
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#include "primitives/block.h" |
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#include "primitives/transaction.h" |
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void zmqError(const char *str); |
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#endif // BITCOIN_ZMQ_ZMQCONFIG_H
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "zmqnotificationinterface.h" |
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#include "zmqpublishnotifier.h" |
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#include "version.h" |
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#include "main.h" |
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#include "streams.h" |
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#include "util.h" |
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void zmqError(const char *str) |
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{ |
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LogPrint("zmq", "Error: %s, errno=%s\n", str, zmq_strerror(errno)); |
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} |
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CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(NULL) |
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{ |
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} |
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CZMQNotificationInterface::~CZMQNotificationInterface() |
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{ |
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// ensure Shutdown if Initialize is called
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assert(!pcontext); |
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for (std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin(); i!=notifiers.end(); ++i) |
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{ |
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delete *i; |
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} |
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} |
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CZMQNotificationInterface* CZMQNotificationInterface::CreateWithArguments(const std::map<std::string, std::string> &args) |
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{ |
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CZMQNotificationInterface* notificationInterface = NULL; |
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std::map<std::string, CZMQNotifierFactory> factories; |
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std::list<CZMQAbstractNotifier*> notifiers; |
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factories["pubhashblock"] = CZMQAbstractNotifier::Create<CZMQPublishHashBlockNotifier>; |
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factories["pubhashtx"] = CZMQAbstractNotifier::Create<CZMQPublishHashTransactionNotifier>; |
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factories["pubrawblock"] = CZMQAbstractNotifier::Create<CZMQPublishRawBlockNotifier>; |
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factories["pubrawtx"] = CZMQAbstractNotifier::Create<CZMQPublishRawTransactionNotifier>; |
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for (std::map<std::string, CZMQNotifierFactory>::const_iterator i=factories.begin(); i!=factories.end(); ++i) |
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{ |
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std::map<std::string, std::string>::const_iterator j = args.find("-zmq" + i->first); |
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if (j!=args.end()) |
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{ |
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CZMQNotifierFactory factory = i->second; |
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std::string address = j->second; |
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CZMQAbstractNotifier *notifier = factory(); |
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notifier->SetType(i->first); |
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notifier->SetAddress(address); |
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notifiers.push_back(notifier); |
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} |
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} |
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if (!notifiers.empty()) |
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{ |
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notificationInterface = new CZMQNotificationInterface(); |
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notificationInterface->notifiers = notifiers; |
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} |
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return notificationInterface; |
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} |
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// Called at startup to conditionally set up ZMQ socket(s)
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bool CZMQNotificationInterface::Initialize() |
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{ |
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LogPrint("zmq", "Initialize notification interface\n"); |
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assert(!pcontext); |
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pcontext = zmq_init(1); |
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if (!pcontext) |
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{ |
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zmqError("Unable to initialize context"); |
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return false; |
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} |
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std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin(); |
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for (; i!=notifiers.end(); ++i) |
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{ |
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CZMQAbstractNotifier *notifier = *i; |
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if (notifier->Initialize(pcontext)) |
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{ |
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LogPrint("zmq", " Notifier %s ready (address = %s)\n", notifier->GetType(), notifier->GetAddress()); |
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} |
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else |
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{ |
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LogPrint("zmq", " Notifier %s failed (address = %s)\n", notifier->GetType(), notifier->GetAddress()); |
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break; |
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} |
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} |
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if (i!=notifiers.end()) |
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{ |
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Shutdown(); |
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return false; |
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} |
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return false; |
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} |
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// Called during shutdown sequence
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void CZMQNotificationInterface::Shutdown() |
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{ |
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LogPrint("zmq", "Shutdown notification interface\n"); |
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if (pcontext) |
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{ |
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for (std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin(); i!=notifiers.end(); ++i) |
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{ |
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CZMQAbstractNotifier *notifier = *i; |
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LogPrint("zmq", " Shutdown notifier %s at %s\n", notifier->GetType(), notifier->GetAddress()); |
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notifier->Shutdown(); |
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} |
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zmq_ctx_destroy(pcontext); |
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pcontext = 0; |
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} |
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} |
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void CZMQNotificationInterface::UpdatedBlockTip(const uint256 &hash) |
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{ |
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for (std::list<CZMQAbstractNotifier*>::iterator i = notifiers.begin(); i!=notifiers.end(); ) |
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{ |
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CZMQAbstractNotifier *notifier = *i; |
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if (notifier->NotifyBlock(hash)) |
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{ |
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i++; |
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} |
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else |
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{ |
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notifier->Shutdown(); |
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i = notifiers.erase(i); |
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} |
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} |
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} |
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void CZMQNotificationInterface::SyncTransaction(const CTransaction &tx, const CBlock *pblock) |
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{ |
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for (std::list<CZMQAbstractNotifier*>::iterator i = notifiers.begin(); i!=notifiers.end(); ) |
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{ |
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CZMQAbstractNotifier *notifier = *i; |
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if (notifier->NotifyTransaction(tx)) |
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{ |
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i++; |
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} |
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else |
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{ |
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notifier->Shutdown(); |
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i = notifiers.erase(i); |
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} |
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} |
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} |
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_ZMQ_ZMQNOTIFICATIONINTERFACE_H |
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#define BITCOIN_ZMQ_ZMQNOTIFICATIONINTERFACE_H |
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#include "validationinterface.h" |
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#include <string> |
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#include <map> |
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class CZMQAbstractNotifier; |
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class CZMQNotificationInterface : public CValidationInterface |
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{ |
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public: |
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virtual ~CZMQNotificationInterface(); |
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static CZMQNotificationInterface* CreateWithArguments(const std::map<std::string, std::string> &args); |
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bool Initialize(); |
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void Shutdown(); |
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protected: // CValidationInterface
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void SyncTransaction(const CTransaction &tx, const CBlock *pblock); |
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void UpdatedBlockTip(const uint256 &newHashTip); |
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private: |
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CZMQNotificationInterface(); |
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void *pcontext; |
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std::list<CZMQAbstractNotifier*> notifiers; |
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}; |
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#endif // BITCOIN_ZMQ_ZMQNOTIFICATIONINTERFACE_H
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@ -0,0 +1,172 @@
@@ -0,0 +1,172 @@
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// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "zmqpublishnotifier.h" |
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#include "main.h" |
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#include "util.h" |
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static std::multimap<std::string, CZMQAbstractPublishNotifier*> mapPublishNotifiers; |
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|
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// Internal function to send multipart message
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static int zmq_send_multipart(void *sock, const void* data, size_t size, ...) |
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{ |
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va_list args; |
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va_start(args, size); |
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|
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while (1) |
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{ |
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zmq_msg_t msg; |
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|
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int rc = zmq_msg_init_size(&msg, size); |
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if (rc != 0) |
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{ |
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zmqError("Unable to initialize ZMQ msg"); |
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return -1; |
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} |
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void *buf = zmq_msg_data(&msg); |
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memcpy(buf, data, size); |
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|
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data = va_arg(args, const void*); |
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|
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rc = zmq_msg_send(&msg, sock, data ? ZMQ_SNDMORE : 0); |
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if (rc == -1) |
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{ |
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zmqError("Unable to send ZMQ msg"); |
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zmq_msg_close(&msg); |
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return -1; |
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} |
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|
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zmq_msg_close(&msg); |
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|
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if (!data) |
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break; |
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|
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size = va_arg(args, size_t); |
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} |
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return 0; |
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} |
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bool CZMQAbstractPublishNotifier::Initialize(void *pcontext) |
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{ |
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assert(!psocket); |
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|
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// check if address is being used by other publish notifier
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std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator i = mapPublishNotifiers.find(address); |
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|
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if (i==mapPublishNotifiers.end()) |
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{ |
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psocket = zmq_socket(pcontext, ZMQ_PUB); |
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if (!psocket) |
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{ |
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zmqError("Failed to create socket"); |
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return false; |
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} |
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|
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int rc = zmq_bind(psocket, address.c_str()); |
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if (rc!=0) |
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{ |
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zmqError("Failed to bind address"); |
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return false; |
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} |
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|
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// register this notifier for the address, so it can be reused for other publish notifier
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mapPublishNotifiers.insert(std::make_pair(address, this)); |
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return true; |
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} |
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else |
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{ |
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LogPrint("zmq", " Reuse socket for address %s\n", address); |
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psocket = i->second->psocket; |
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mapPublishNotifiers.insert(std::make_pair(address, this)); |
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return true; |
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} |
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} |
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void CZMQAbstractPublishNotifier::Shutdown() |
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{ |
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assert(psocket); |
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int count = mapPublishNotifiers.count(address); |
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|
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// remove this notifier from the list of publishers using this address
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typedef std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator iterator; |
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std::pair<iterator, iterator> iterpair = mapPublishNotifiers.equal_range(address); |
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|
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for (iterator it = iterpair.first; it != iterpair.second; ++it) |
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{ |
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if (it->second==this) |
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{ |
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mapPublishNotifiers.erase(it); |
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break; |
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} |
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} |
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|
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if (count == 1) |
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{ |
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LogPrint("zmq", "Close socket at address %s\n", address); |
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int linger = 0; |
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zmq_setsockopt(psocket, ZMQ_LINGER, &linger, sizeof(linger)); |
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zmq_close(psocket); |
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} |
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|
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psocket = 0; |
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} |
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|
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bool CZMQPublishHashBlockNotifier::NotifyBlock(const uint256 &hash) |
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{ |
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LogPrint("zmq", "Publish hash block %s\n", hash.GetHex()); |
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char data[32]; |
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for (unsigned int i = 0; i < 32; i++) |
||||
data[31 - i] = hash.begin()[i]; |
||||
int rc = zmq_send_multipart(psocket, "hashblock", 9, data, 32, 0); |
||||
return rc == 0; |
||||
} |
||||
|
||||
bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &transaction) |
||||
{ |
||||
uint256 hash = transaction.GetHash(); |
||||
LogPrint("zmq", "Publish hash transaction %s\n", hash.GetHex()); |
||||
char data[32]; |
||||
for (unsigned int i = 0; i < 32; i++) |
||||
data[31 - i] = hash.begin()[i]; |
||||
int rc = zmq_send_multipart(psocket, "hashtx", 6, data, 32, 0); |
||||
return rc == 0; |
||||
} |
||||
|
||||
bool CZMQPublishRawBlockNotifier::NotifyBlock(const uint256 &hash) |
||||
{ |
||||
LogPrint("zmq", "Publish raw block %s\n", hash.GetHex()); |
||||
|
||||
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION); |
||||
{ |
||||
LOCK(cs_main); |
||||
|
||||
CBlock block; |
||||
CBlockIndex* pblockindex = mapBlockIndex[hash]; |
||||
|
||||
if(!ReadBlockFromDisk(block, pblockindex)) |
||||
{ |
||||
zmqError("Can't read block from disk"); |
||||
return false; |
||||
} |
||||
|
||||
ss << block; |
||||
} |
||||
|
||||
int rc = zmq_send_multipart(psocket, "rawblock", 8, &(*ss.begin()), ss.size(), 0); |
||||
return rc == 0; |
||||
} |
||||
|
||||
bool CZMQPublishRawTransactionNotifier::NotifyTransaction(const CTransaction &transaction) |
||||
{ |
||||
uint256 hash = transaction.GetHash(); |
||||
LogPrint("zmq", "Publish raw transaction %s\n", hash.GetHex()); |
||||
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION); |
||||
ss << transaction; |
||||
int rc = zmq_send_multipart(psocket, "rawtx", 5, &(*ss.begin()), ss.size(), 0); |
||||
return rc == 0; |
||||
} |
||||
@ -0,0 +1,41 @@
@@ -0,0 +1,41 @@
|
||||
// Copyright (c) 2015 The Bitcoin Core developers
|
||||
// Distributed under the MIT software license, see the accompanying
|
||||
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
||||
|
||||
#ifndef BITCOIN_ZMQ_ZMQPUBLISHNOTIFIER_H |
||||
#define BITCOIN_ZMQ_ZMQPUBLISHNOTIFIER_H |
||||
|
||||
#include "zmqabstractnotifier.h" |
||||
|
||||
class CZMQAbstractPublishNotifier : public CZMQAbstractNotifier |
||||
{ |
||||
public: |
||||
bool Initialize(void *pcontext); |
||||
void Shutdown(); |
||||
}; |
||||
|
||||
class CZMQPublishHashBlockNotifier : public CZMQAbstractPublishNotifier |
||||
{ |
||||
public: |
||||
bool NotifyBlock(const uint256 &hash); |
||||
}; |
||||
|
||||
class CZMQPublishHashTransactionNotifier : public CZMQAbstractPublishNotifier |
||||
{ |
||||
public: |
||||
bool NotifyTransaction(const CTransaction &transaction); |
||||
}; |
||||
|
||||
class CZMQPublishRawBlockNotifier : public CZMQAbstractPublishNotifier |
||||
{ |
||||
public: |
||||
bool NotifyBlock(const uint256 &hash); |
||||
}; |
||||
|
||||
class CZMQPublishRawTransactionNotifier : public CZMQAbstractPublishNotifier |
||||
{ |
||||
public: |
||||
bool NotifyTransaction(const CTransaction &transaction); |
||||
}; |
||||
|
||||
#endif // BITCOIN_ZMQ_ZMQPUBLISHNOTIFIER_H
|
||||
Loading…
Reference in new issue