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
|
#include "traffic/traffic_info.hpp"
#include "platform/http_client.hpp"
#include "coding/bit_streams.hpp"
#include "coding/reader.hpp"
#include "coding/varint.hpp"
#include "coding/write_to_sink.hpp"
#include "coding/writer.hpp"
#include "base/assert.hpp"
#include "base/logging.hpp"
#include "std/algorithm.hpp"
#include "std/string.hpp"
#include "private.h"
namespace traffic
{
namespace
{
bool ReadRemoteFile(string const & url, vector<uint8_t> & result)
{
platform::HttpClient request(url);
if (!request.RunHttpRequest() || request.ErrorCode() != 200)
return false;
string const & response = request.ServerResponse();
result.resize(response.size());
for (size_t i = 0; i < response.size(); ++i)
result[i] = static_cast<uint8_t>(response[i]);
return true;
}
} // namespace
// TrafficInfo::RoadSegmentId -----------------------------------------------------------------
TrafficInfo::RoadSegmentId::RoadSegmentId() : m_fid(0), m_idx(0), m_dir(0) {}
TrafficInfo::RoadSegmentId::RoadSegmentId(uint32_t fid, uint16_t idx, uint8_t dir)
: m_fid(fid), m_idx(idx), m_dir(dir)
{
}
// TrafficInfo --------------------------------------------------------------------------------
TrafficInfo::TrafficInfo(MwmSet::MwmId const & mwmId) : m_mwmId(mwmId) {}
bool TrafficInfo::ReceiveTrafficData(string const & fileName)
{
if (strlen(TRAFFIC_DATA_BASE_URL) == 0)
return false;
string const url = string(TRAFFIC_DATA_BASE_URL) + string(fileName);
vector<uint8_t> contents;
if (!ReadRemoteFile(url, contents))
return false;
Coloring coloring;
try
{
DeserializeTrafficData(contents, coloring);
}
catch (Reader::Exception const & e)
{
LOG(LINFO, ("Could not read traffic data received from server."));
return false;
}
m_coloring.swap(coloring);
return true;
}
SpeedGroup TrafficInfo::GetSpeedGroup(RoadSegmentId const & id) const
{
auto const it = m_coloring.find(id);
if (it == m_coloring.cend())
return SpeedGroup::Unknown;
return it->second;
}
// static
void TrafficInfo::SerializeTrafficData(Coloring const & coloring, vector<uint8_t> & result)
{
MemWriter<vector<uint8_t>> memWriter(result);
WriteToSink(memWriter, static_cast<uint32_t>(coloring.size()));
for (auto const & p : coloring)
{
WriteVarUint(memWriter, p.first.m_fid);
uint16_t const x = (p.first.m_idx << 1) | p.first.m_dir;
WriteVarUint(memWriter, x);
}
{
BitWriter<decltype(memWriter)> bitWriter(memWriter);
for (auto const & p : coloring)
{
// SpeedGroup's values fit into 3 bits.
bitWriter.Write(static_cast<uint8_t>(p.second), 3);
}
}
}
// static
void TrafficInfo::DeserializeTrafficData(vector<uint8_t> const & data, Coloring & coloring)
{
MemReader memReader(data.data(), data.size());
ReaderSource<decltype(memReader)> src(memReader);
auto const n = ReadPrimitiveFromSource<uint32_t>(src);
vector<RoadSegmentId> keys(n);
for (size_t i = 0; i < static_cast<size_t>(n); ++i)
{
keys[i].m_fid = ReadVarUint<uint32_t>(src);
auto const x = ReadVarUint<uint32_t>(src);
keys[i].m_idx = static_cast<uint16_t>(x >> 1);
keys[i].m_dir = static_cast<uint8_t>(x & 1);
}
vector<SpeedGroup> values(n);
BitReader<decltype(src)> bitReader(src);
for (size_t i = 0; i < static_cast<size_t>(n); ++i)
{
// SpeedGroup's values fit into 3 bits.
values[i] = static_cast<SpeedGroup>(bitReader.Read(3));
}
coloring.clear();
for (size_t i = 0; i < static_cast<size_t>(n); ++i)
coloring[keys[i]] = values[i];
ASSERT_EQUAL(src.Size(), 0, ());
}
} // namespace traffic
|
