1 //
2 // Copyright (C) 2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions
7 // are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 //
14 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 // ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
16 // TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
18 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 package sysdb
28 import (
29 "fmt"
30 "time"
31 )
33 // The SysDB JSON time format.
34 const jsonTime = `"2006-01-02 15:04:05 -0700"`
36 // A Duration represents the elapsed time between two instants as a
37 // nanoseconds count.
38 //
39 // It supports marshaling to and unmarshaling from the SysDB JSON format (a
40 // sequence of decimal numbers with a unit suffix).
41 type Duration time.Duration
43 const (
44 Second = Duration(1000000000)
45 Minute = 60 * Second
46 Hour = 60 * Minute
47 Day = 24 * Hour
48 Month = Duration(30436875 * 24 * 60 * 60 * 1000)
49 Year = Duration(3652425 * 24 * 60 * 60 * 100000)
50 )
52 // MarshalJSON implements the json.Marshaler interface. The time is a quoted
53 // string in the SysDB JSON format.
54 func (d Duration) MarshalJSON() ([]byte, error) {
55 if d == 0 {
56 return []byte(`"0s"`), nil
57 }
59 s := `"`
60 secs := false
61 for _, spec := range []struct {
62 interval Duration
63 suffix string
64 }{{Year, "Y"}, {Month, "M"}, {Day, "D"}, {Hour, "h"}, {Minute, "m"}, {Second, ""}} {
65 if d >= spec.interval {
66 s += fmt.Sprintf("%d%s", d/spec.interval, spec.suffix)
67 d %= spec.interval
68 if spec.interval == Second {
69 secs = true
70 }
71 }
72 }
74 if d > 0 {
75 s += fmt.Sprintf(".%09d", d)
76 for i := len(s) - 1; i > 0; i-- {
77 if s[i] != '0' {
78 break
79 }
80 s = s[:i]
81 }
82 secs = true
83 }
84 if secs {
85 s += "s"
86 }
87 s += `"`
88 return []byte(s), nil
89 }
91 // UnmarshalJSON implements the json.Unmarshaler interface. The duration is
92 // expected to be a quoted string in the SysDB JSON format.
93 func (d *Duration) UnmarshalJSON(data []byte) error {
94 m := map[string]Duration{
95 "Y": Year,
96 "M": Month,
97 "D": Day,
98 "h": Hour,
99 "m": Minute,
100 "s": Second,
101 }
103 if data[0] != '"' || data[len(data)-1] != '"' {
104 return fmt.Errorf("unquoted duration %q", string(data))
105 }
106 data = data[1 : len(data)-1]
108 orig := string(data)
109 var res Duration
110 for len(data) != 0 {
111 // consume digits
112 n := 0
113 dec := 0
114 frac := false
115 for n < len(data) && '0' <= data[n] && data[n] <= '9' {
116 dec = dec*10 + int(data[n]-'0')
117 n++
118 }
119 if n < len(data) && data[n] == '.' {
120 frac = true
121 n++
123 // consume fraction
124 m := 1000000000
125 for n < len(data) && '0' <= data[n] && data[n] <= '9' {
126 if m > 1 { // cut of to nanoseconds
127 dec = dec*10 + int(data[n]-'0')
128 m /= 10
129 }
130 n++
131 }
132 dec *= m
133 }
134 if n >= len(data) {
135 return fmt.Errorf("missing unit in duration %q", orig)
136 }
137 if n == 0 {
138 // we found something which is not a number
139 return fmt.Errorf("invalid duration %q", orig)
140 }
142 // consume unit
143 u := n
144 for u < len(data) && data[u] != '.' && (data[u] < '0' || '9' < data[u]) {
145 u++
146 }
148 unit := string(data[n:u])
149 data = data[u:]
151 // convert to Duration
152 d, ok := m[unit]
153 if !ok {
154 return fmt.Errorf("invalid unit %q in duration %q", unit, orig)
155 }
157 if d == Second {
158 if frac {
159 d = 1
160 }
161 } else if frac {
162 return fmt.Errorf("invalid fraction %q%s in duration %q", dec, unit, orig)
163 }
165 res += Duration(dec) * d
166 }
167 *d = res
168 return nil
169 }
171 // String returns the duration formatted using a predefined format string.
172 func (d Duration) String() string { return time.Duration(d).String() }
174 // A Time represents an instant in time with nanosecond precision.
175 //
176 // It supports marshaling to and unmarshaling from the SysDB JSON format
177 // (YYYY-MM-DD hh:mm:ss +-zzzz).
178 type Time time.Time
180 func (t Time) MarshalJSON() ([]byte, error) {
181 return []byte(time.Time(t).Format(jsonTime)), nil
182 }
184 // UnmarshalJSON implements the json.Unmarshaler interface. The time is
185 // expected to be a quoted string in the SysDB JSON format.
186 func (t *Time) UnmarshalJSON(data []byte) error {
187 parsed, err := time.Parse(jsonTime, string(data))
188 if err == nil {
189 *t = Time(parsed)
190 }
191 return err
192 }
194 // Equal reports whether t and u represent the same time instant.
195 func (t Time) Equal(u Time) bool {
196 return time.Time(t).Equal(time.Time(u))
197 }
199 // String returns the time formatted using a predefined format string.
200 func (t Time) String() string { return time.Time(t).String() }
202 // An Attribute describes a host, metric, or service attribute.
203 type Attribute struct {
204 Name string `json:"name"`
205 Value string `json:"value"`
206 LastUpdate Time `json:"last_update"`
207 UpdateInterval Duration `json:"update_interval"`
208 Backends []string `json:"backends"`
209 }
211 // A Metric describes a metric known to SysDB.
212 type Metric struct {
213 Name string `json:"name"`
214 LastUpdate Time `json:"last_update"`
215 UpdateInterval Duration `json:"update_interval"`
216 Backends []string `json:"backends"`
217 Attributes []Attribute `json:"attributes"`
218 }
220 // A Service describes a service object stored in the SysDB store.
221 type Service struct {
222 Name string `json:"name"`
223 LastUpdate Time `json:"last_update"`
224 UpdateInterval Duration `json:"update_interval"`
225 Backends []string `json:"backends"`
226 Attributes []Attribute `json:"attributes"`
227 }
229 // A Host describes a host object stored in the SysDB store.
230 type Host struct {
231 Name string `json:"name"`
232 LastUpdate Time `json:"last_update"`
233 UpdateInterval Duration `json:"update_interval"`
234 Backends []string `json:"backends"`
235 Attributes []Attribute `json:"attributes"`
236 Metrics []Metric `json:"metrics"`
237 Services []Service `json:"services"`
238 }
240 // A DataPoint describes a datum at a certain point of time.
241 type DataPoint struct {
242 Timestamp Time `json:"timestamp"`
243 Value float64 `json:"value,string"`
244 }
246 // A Timeseries describes a sequence of data-points.
247 type Timeseries struct {
248 Start Time `json:"start"`
249 End Time `json:"end"`
250 Data map[string][]DataPoint `json:"data"`
251 }
253 // vim: set tw=78 sw=4 sw=4 noexpandtab :