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
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "mirror.h"
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/frt/target.h>
#include <vespa/log/log.h>
LOG_SETUP(".slobrok.mirror");
namespace slobrok::api {
MirrorOld::MirrorOld(FRT_Supervisor &orb, const std::vector<std::string> &slobroks)
: FNET_Task(orb.GetScheduler()),
_orb(orb),
_lock(),
_reqDone(false),
_specs(),
_specsGen(),
_updates(),
_slobrokspecs(),
_idx(0),
_backOff(),
_target(0),
_req(0)
{
_slobrokspecs = slobroks;
for (uint32_t i = 0; i < slobroks.size(); ++i) { // randomize order
uint32_t x = random() % slobroks.size();
if (x != i) {
std::swap(_slobrokspecs[i], _slobrokspecs[x]);
}
}
if (_slobrokspecs.size() <= 0) {
LOG(error, "no service location brokers!");
}
ScheduleNow();
}
MirrorOld::~MirrorOld()
{
Kill();
if (_req != 0) {
_req->Abort();
_req->SubRef();
}
if (_target != 0) {
_target->SubRef();
}
}
MirrorOld::SpecList
MirrorOld::lookup(const std::string & pattern) const
{
SpecList ret;
_lock.Lock();
SpecList::const_iterator end = _specs.end();
for (SpecList::const_iterator it = _specs.begin(); it != end; ++it) {
if (match(it->first.c_str(), pattern.c_str())) {
ret.push_back(*it);
}
}
_lock.Unlock();
return ret;
}
bool
IMirrorOld::match(const char *name, const char *pattern)
{
LOG_ASSERT(name != NULL);
LOG_ASSERT(pattern != NULL);
while (*pattern != '\0') {
if (*name == *pattern) {
++name;
++pattern;
} else if (*pattern == '*') {
++pattern;
while (*name != '/' && *name != '\0') {
++name;
}
} else {
return false;
}
}
return (*name == *pattern);
}
void
MirrorOld::PerformTask()
{
if (_reqDone) {
_reqDone = false;
if (_req->IsError()
|| strcmp(_req->GetReturnSpec(), "SSi") != 0
|| (_req->GetReturn()->GetValue(0)._string_array._len !=
_req->GetReturn()->GetValue(1)._string_array._len))
{
if (_target != 0) {
_target->SubRef();
}
_target = 0;
ScheduleNow(); // try next slobrok
return;
}
FRT_Values &answer = *(_req->GetReturn());
if (_specsGen != answer[2]._intval32) {
SpecList specs;
uint32_t numNames = answer[0]._string_array._len;
FRT_StringValue *n = answer[0]._string_array._pt;
FRT_StringValue *s = answer[1]._string_array._pt;
for (uint32_t idx = 0; idx < numNames; idx++) {
specs.push_back(std::make_pair(std::string(n[idx]._str),
std::string(s[idx]._str)));
}
_lock.Lock();
std::swap(specs, _specs);
_updates.add();
_lock.Unlock();
_specsGen.setFromInt(answer[2]._intval32);
}
_backOff.reset();
Schedule(0.1); // be nice
return;
}
if (_target == 0) {
if (_idx >= _slobrokspecs.size()) {
_idx = 0;
double delay = _backOff.get();
Schedule(delay);
if (_slobrokspecs.size() < 1) {
// we already logged an error for this
return;
}
if (_backOff.shouldWarn()) {
std::string cps = _slobrokspecs[0];
for (size_t ss = 1; ss < _slobrokspecs.size(); ++ss) {
cps += " or at ";
cps += _slobrokspecs[ss];
}
LOG(warning, "cannot connect to location broker at %s "
"(retry in %f seconds)", cps.c_str(), delay);
}
return;
}
_target = _orb.GetTarget(_slobrokspecs[_idx++].c_str());
LOG_ASSERT(_target != 0); // just in case (tm)
_specsGen.reset();
}
_req = _orb.AllocRPCRequest(_req);
_req->SetMethodName("slobrok.mirror.fetch");
_req->GetParams()->AddInt32(_specsGen.getAsInt()); // gencnt
_req->GetParams()->AddInt32(5000); // mstimeout
_target->InvokeAsync(_req, 40.0, this);
}
void
MirrorOld::RequestDone(FRT_RPCRequest *req)
{
LOG_ASSERT(req == _req && !_reqDone);
(void) req;
_reqDone = true;
ScheduleNow();
}
} // namespace slobrok::api
|
