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
|
//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2017 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with sfive. If not, see <http://www.gnu.org/licenses/>.
//
package sfive
import (
"encoding/json"
"fmt"
"io"
)
const (
ProtocolVersion = 1
)
//
// Decoder
//
type Decoder interface {
Decode() (UpdateFull, error)
Slug() string
}
// stateless protocol interfaces
type StatelessDecoder struct {
dec *json.Decoder
}
func NewStatelessDecoder(r io.Reader) Decoder {
return &StatelessDecoder{json.NewDecoder(r)}
}
func (sd *StatelessDecoder) Slug() string {
return ""
}
func (sd *StatelessDecoder) Decode() (uf UpdateFull, err error) {
if err = sd.dec.Decode(&uf); err != nil {
return
}
if uf.Version != ProtocolVersion {
err = fmt.Errorf("unsupported version: %d, expected: %d", uf.Version, ProtocolVersion)
}
return
}
// stateful protocol interfaces
type StatefulDecoder struct {
dec *json.Decoder
Header
Source
}
func NewStatefulDecoder(r io.Reader) (Decoder, error) {
dec := &StatefulDecoder{}
dec.dec = json.NewDecoder(r)
if err := dec.dec.Decode(&dec); err != nil {
return nil, err
}
if dec.Version != ProtocolVersion {
return nil, fmt.Errorf("unsupported version: %d, expected: %d", dec.Version, ProtocolVersion)
}
return dec, nil
}
func (sd *StatefulDecoder) Slug() string {
s := sd.Source
return fmt.Sprintf("%s/%s/%s/%s", s.Hostname, s.Stream.ContentId, s.Stream.Format, s.Stream.Quality)
}
func (sd *StatefulDecoder) Decode() (uf UpdateFull, err error) {
uf.Version = sd.Version
uf.CopyFromSource(&sd.Source)
if err = sd.dec.Decode(&uf); err != nil {
return
}
if uf.Version != sd.Version {
err = fmt.Errorf("unsupported version: %d, expected: %d", uf.Version, sd.Version)
}
return
}
//
// Encoder
//
type Encoder interface {
Encode(UpdateFull) error
Slug() string
}
// stateless protocol interfaces
type StatelessEncoder struct {
enc *json.Encoder
}
func NewStatelessEncoder(w io.Writer) Encoder {
return &StatelessEncoder{json.NewEncoder(w)}
}
func (se *StatelessEncoder) Slug() string {
return ""
}
func (se *StatelessEncoder) Encode(uf UpdateFull) error {
uf.Version = ProtocolVersion
uf.StartTime = uf.StartTime.UTC()
return se.enc.Encode(uf)
}
// stateful protocol interfaces
type StatefulEncoder struct {
enc *json.Encoder
Header
}
func NewStatefulEncoder(w io.Writer) (Encoder, error) {
enc := &StatefulEncoder{}
enc.Version = ProtocolVersion
enc.enc = json.NewEncoder(w)
return enc, enc.enc.Encode(&enc)
}
func (se *StatefulEncoder) Slug() string {
return ""
}
func (se *StatefulEncoder) Encode(uf UpdateFull) error {
uf.Version = 0 // the init message took care of that
uf.StartTime = uf.StartTime.UTC()
return se.enc.Encode(uf)
}
|
