aboutsummaryrefslogtreecommitdiff
path: root/src/zmq/zmqnotificationinterface.cpp
blob: ebbaf8683d58eb2b3a324b622b2fe93bc8cf4362 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
// Copyright (c) 2015-2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <zmq/zmqnotificationinterface.h>
#include <zmq/zmqpublishnotifier.h>

#include <validation.h>
#include <util/system.h>

void zmqError(const char *str)
{
    LogPrint(BCLog::ZMQ, "zmq: Error: %s, errno=%s\n", str, zmq_strerror(errno));
}

CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(nullptr)
{
}

CZMQNotificationInterface::~CZMQNotificationInterface()
{
    Shutdown();

    for (std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin(); i!=notifiers.end(); ++i)
    {
        delete *i;
    }
}

std::list<const CZMQAbstractNotifier*> CZMQNotificationInterface::GetActiveNotifiers() const
{
    std::list<const CZMQAbstractNotifier*> result;
    for (const auto* n : notifiers) {
        result.push_back(n);
    }
    return result;
}

CZMQNotificationInterface* CZMQNotificationInterface::Create()
{
    CZMQNotificationInterface* notificationInterface = nullptr;
    std::map<std::string, CZMQNotifierFactory> factories;
    std::list<CZMQAbstractNotifier*> notifiers;

    factories["pubhashblock"] = CZMQAbstractNotifier::Create<CZMQPublishHashBlockNotifier>;
    factories["pubhashtx"] = CZMQAbstractNotifier::Create<CZMQPublishHashTransactionNotifier>;
    factories["pubrawblock"] = CZMQAbstractNotifier::Create<CZMQPublishRawBlockNotifier>;
    factories["pubrawtx"] = CZMQAbstractNotifier::Create<CZMQPublishRawTransactionNotifier>;

    for (const auto& entry : factories)
    {
        std::string arg("-zmq" + entry.first);
        if (gArgs.IsArgSet(arg))
        {
            CZMQNotifierFactory factory = entry.second;
            std::string address = gArgs.GetArg(arg, "");
            CZMQAbstractNotifier *notifier = factory();
            notifier->SetType(entry.first);
            notifier->SetAddress(address);
            notifier->SetOutboundMessageHighWaterMark(static_cast<int>(gArgs.GetArg(arg + "hwm", CZMQAbstractNotifier::DEFAULT_ZMQ_SNDHWM)));
            notifiers.push_back(notifier);
        }
    }

    if (!notifiers.empty())
    {
        notificationInterface = new CZMQNotificationInterface();
        notificationInterface->notifiers = notifiers;

        if (!notificationInterface->Initialize())
        {
            delete notificationInterface;
            notificationInterface = nullptr;
        }
    }

    return notificationInterface;
}

// Called at startup to conditionally set up ZMQ socket(s)
bool CZMQNotificationInterface::Initialize()
{
    int major = 0, minor = 0, patch = 0;
    zmq_version(&major, &minor, &patch);
    LogPrint(BCLog::ZMQ, "zmq: version %d.%d.%d\n", major, minor, patch);

    LogPrint(BCLog::ZMQ, "zmq: Initialize notification interface\n");
    assert(!pcontext);

    pcontext = zmq_ctx_new();

    if (!pcontext)
    {
        zmqError("Unable to initialize context");
        return false;
    }

    std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin();
    for (; i!=notifiers.end(); ++i)
    {
        CZMQAbstractNotifier *notifier = *i;
        if (notifier->Initialize(pcontext))
        {
            LogPrint(BCLog::ZMQ, "zmq: Notifier %s ready (address = %s)\n", notifier->GetType(), notifier->GetAddress());
        }
        else
        {
            LogPrint(BCLog::ZMQ, "zmq: Notifier %s failed (address = %s)\n", notifier->GetType(), notifier->GetAddress());
            break;
        }
    }

    if (i!=notifiers.end())
    {
        return false;
    }

    return true;
}

// Called during shutdown sequence
void CZMQNotificationInterface::Shutdown()
{
    LogPrint(BCLog::ZMQ, "zmq: Shutdown notification interface\n");
    if (pcontext)
    {
        for (std::list<CZMQAbstractNotifier*>::iterator i=notifiers.begin(); i!=notifiers.end(); ++i)
        {
            CZMQAbstractNotifier *notifier = *i;
            LogPrint(BCLog::ZMQ, "zmq: Shutdown notifier %s at %s\n", notifier->GetType(), notifier->GetAddress());
            notifier->Shutdown();
        }
        zmq_ctx_term(pcontext);

        pcontext = nullptr;
    }
}

void CZMQNotificationInterface::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload)
{
    if (fInitialDownload || pindexNew == pindexFork) // In IBD or blocks were disconnected without any new ones
        return;

    for (std::list<CZMQAbstractNotifier*>::iterator i = notifiers.begin(); i!=notifiers.end(); )
    {
        CZMQAbstractNotifier *notifier = *i;
        if (notifier->NotifyBlock(pindexNew))
        {
            i++;
        }
        else
        {
            notifier->Shutdown();
            i = notifiers.erase(i);
        }
    }
}

void CZMQNotificationInterface::TransactionAddedToMempool(const CTransactionRef& ptx)
{
    // Used by BlockConnected and BlockDisconnected as well, because they're
    // all the same external callback.
    const CTransaction& tx = *ptx;

    for (std::list<CZMQAbstractNotifier*>::iterator i = notifiers.begin(); i!=notifiers.end(); )
    {
        CZMQAbstractNotifier *notifier = *i;
        if (notifier->NotifyTransaction(tx))
        {
            i++;
        }
        else
        {
            notifier->Shutdown();
            i = notifiers.erase(i);
        }
    }
}

void CZMQNotificationInterface::BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected, const std::vector<CTransactionRef>& vtxConflicted)
{
    for (const CTransactionRef& ptx : pblock->vtx) {
        // Do a normal notify for each transaction added in the block
        TransactionAddedToMempool(ptx);
    }
}

void CZMQNotificationInterface::BlockDisconnected(const std::shared_ptr<const CBlock>& pblock)
{
    for (const CTransactionRef& ptx : pblock->vtx) {
        // Do a normal notify for each transaction removed in block disconnection
        TransactionAddedToMempool(ptx);
    }
}

CZMQNotificationInterface* g_zmq_notification_interface = nullptr;