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
197
198
199
200
201
202
203
204
205
206
207
208
209
|
// 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 <chain.h>
#include <chainparams.h>
#include <streams.h>
#include <zmq/zmqpublishnotifier.h>
#include <validation.h>
#include <util/system.h>
#include <rpc/server.h>
static std::multimap<std::string, CZMQAbstractPublishNotifier*> mapPublishNotifiers;
static const char *MSG_HASHBLOCK = "hashblock";
static const char *MSG_HASHTX = "hashtx";
static const char *MSG_RAWBLOCK = "rawblock";
static const char *MSG_RAWTX = "rawtx";
// Internal function to send multipart message
static int zmq_send_multipart(void *sock, const void* data, size_t size, ...)
{
va_list args;
va_start(args, size);
while (1)
{
zmq_msg_t msg;
int rc = zmq_msg_init_size(&msg, size);
if (rc != 0)
{
zmqError("Unable to initialize ZMQ msg");
va_end(args);
return -1;
}
void *buf = zmq_msg_data(&msg);
memcpy(buf, data, size);
data = va_arg(args, const void*);
rc = zmq_msg_send(&msg, sock, data ? ZMQ_SNDMORE : 0);
if (rc == -1)
{
zmqError("Unable to send ZMQ msg");
zmq_msg_close(&msg);
va_end(args);
return -1;
}
zmq_msg_close(&msg);
if (!data)
break;
size = va_arg(args, size_t);
}
va_end(args);
return 0;
}
bool CZMQAbstractPublishNotifier::Initialize(void *pcontext)
{
assert(!psocket);
// check if address is being used by other publish notifier
std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator i = mapPublishNotifiers.find(address);
if (i==mapPublishNotifiers.end())
{
psocket = zmq_socket(pcontext, ZMQ_PUB);
if (!psocket)
{
zmqError("Failed to create socket");
return false;
}
LogPrint(BCLog::ZMQ, "zmq: Outbound message high water mark for %s at %s is %d\n", type, address, outbound_message_high_water_mark);
int rc = zmq_setsockopt(psocket, ZMQ_SNDHWM, &outbound_message_high_water_mark, sizeof(outbound_message_high_water_mark));
if (rc != 0)
{
zmqError("Failed to set outbound message high water mark");
zmq_close(psocket);
return false;
}
rc = zmq_bind(psocket, address.c_str());
if (rc != 0)
{
zmqError("Failed to bind address");
zmq_close(psocket);
return false;
}
// register this notifier for the address, so it can be reused for other publish notifier
mapPublishNotifiers.insert(std::make_pair(address, this));
return true;
}
else
{
LogPrint(BCLog::ZMQ, "zmq: Reusing socket for address %s\n", address);
LogPrint(BCLog::ZMQ, "zmq: Outbound message high water mark for %s at %s is %d\n", type, address, outbound_message_high_water_mark);
psocket = i->second->psocket;
mapPublishNotifiers.insert(std::make_pair(address, this));
return true;
}
}
void CZMQAbstractPublishNotifier::Shutdown()
{
// Early return if Initialize was not called
if (!psocket) return;
int count = mapPublishNotifiers.count(address);
// remove this notifier from the list of publishers using this address
typedef std::multimap<std::string, CZMQAbstractPublishNotifier*>::iterator iterator;
std::pair<iterator, iterator> iterpair = mapPublishNotifiers.equal_range(address);
for (iterator it = iterpair.first; it != iterpair.second; ++it)
{
if (it->second==this)
{
mapPublishNotifiers.erase(it);
break;
}
}
if (count == 1)
{
LogPrint(BCLog::ZMQ, "zmq: Close socket at address %s\n", address);
int linger = 0;
zmq_setsockopt(psocket, ZMQ_LINGER, &linger, sizeof(linger));
zmq_close(psocket);
}
psocket = nullptr;
}
bool CZMQAbstractPublishNotifier::SendMessage(const char *command, const void* data, size_t size)
{
assert(psocket);
/* send three parts, command & data & a LE 4byte sequence number */
unsigned char msgseq[sizeof(uint32_t)];
WriteLE32(&msgseq[0], nSequence);
int rc = zmq_send_multipart(psocket, command, strlen(command), data, size, msgseq, (size_t)sizeof(uint32_t), nullptr);
if (rc == -1)
return false;
/* increment memory only sequence number after sending */
nSequence++;
return true;
}
bool CZMQPublishHashBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
{
uint256 hash = pindex->GetBlockHash();
LogPrint(BCLog::ZMQ, "zmq: Publish hashblock %s\n", hash.GetHex());
char data[32];
for (unsigned int i = 0; i < 32; i++)
data[31 - i] = hash.begin()[i];
return SendMessage(MSG_HASHBLOCK, data, 32);
}
bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "zmq: Publish hashtx %s\n", hash.GetHex());
char data[32];
for (unsigned int i = 0; i < 32; i++)
data[31 - i] = hash.begin()[i];
return SendMessage(MSG_HASHTX, data, 32);
}
bool CZMQPublishRawBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
{
LogPrint(BCLog::ZMQ, "zmq: Publish rawblock %s\n", pindex->GetBlockHash().GetHex());
const Consensus::Params& consensusParams = Params().GetConsensus();
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
{
LOCK(cs_main);
CBlock block;
if(!ReadBlockFromDisk(block, pindex, consensusParams))
{
zmqError("Can't read block from disk");
return false;
}
ss << block;
}
return SendMessage(MSG_RAWBLOCK, &(*ss.begin()), ss.size());
}
bool CZMQPublishRawTransactionNotifier::NotifyTransaction(const CTransaction &transaction)
{
uint256 hash = transaction.GetHash();
LogPrint(BCLog::ZMQ, "zmq: Publish rawtx %s\n", hash.GetHex());
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
ss << transaction;
return SendMessage(MSG_RAWTX, &(*ss.begin()), ss.size());
}
|
