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annotate pkg/common/time.go @ 5591:0011f50cf216 surveysperbottleneckid

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Removed no longer used alternative api for surveys/ endpoint. As bottlenecks in the summary for SR imports are now identified by their id and no longer by the (not guarantied to be unique!) name, there is no longer the need to request survey data by the name+date tuple (which isn't reliable anyway). So the workaround was now reversed.
author Sascha Wilde <wilde@sha-bang.de>
date Wed, 06 Apr 2022 13:30:29 +0200
parents b3b990811f2c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018, 2019 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13 // * Bernhard E. Reiter <bernhard.reiter@intevation.de>
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14
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15 package common
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16
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17 import (
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18 "math"
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19 "time"
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20 )
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21
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22 const (
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23 // time.RFC3339 equals "simplified ISO format as defined by ECMA-262"
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24 // https://tc39.github.io/ecma262/#sec-date-time-string-format
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25 // and "SHOULD be used in new protocols on the Internet." (RFC section 5.6)
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26
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27 // TimeFormat is the preferred time format represention in gemma.
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28 TimeFormat = time.RFC3339
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29 // TimeFormatMicro is the same as TimeFormat but also
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30 // contains 3 digits for micro seconds.
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31 // This is useful for e.g. times in imports and the
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32 // respective logs.
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33 TimeFormatMicro = "2006-01-02T15:04:05.999Z07:00"
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34 // TimeFormatMicroLocal is the same as TimeFormatMicro but
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35 // w/o the timezone. Only used for tolerant parsing.
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36 TimeFormatMicroLocal = "2006-01-02T15:04:05.000"
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37 // DateFormat represents the preferred date format in Gemma.
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38 DateFormat = "2006-01-02"
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39 )
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40
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41 // TimeParser is a list of time formats.
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42 type TimeParser []string
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43
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44 // ParseTime parses the time formats known to Gemma.
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45 var ParseTime = TimeParser{
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46 TimeFormat,
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47 TimeFormatMicro,
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48 TimeFormatMicroLocal,
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49 DateFormat,
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50 }.Parse
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51
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52 var utc0 = time.Unix(0, 0)
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53
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54 // Parse tries to parse a given string by the entries of the layout
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55 // list one after another. The first matching time is returned.
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56 // If no layout matches the last error is returned or time zero
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57 // if the layout list is empty.
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58 func (tg TimeParser) Parse(s string) (time.Time, error) {
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59 var err error
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60 var t time.Time
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61 for _, layout := range tg {
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62 if t, err = time.Parse(layout, s); err == nil {
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63 break
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64 }
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65 }
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66 return t, err
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67 }
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68
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69 // InterpolateTime returns a function that linearly interpolates the
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70 // time between t1 and t2 for given value m1 to m2.
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71 // If m1 is given to the returned function t1 is returned.
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72 // If m2 is given to the returned function t2 is returned.
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73 // Values between m1 and m2 will result in the proportional
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74 // time between t1 and t2.
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75 func InterpolateTime(t1 time.Time, m1 float64, t2 time.Time, m2 float64) func(float64) time.Time {
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76
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77 // f(m1) = t1
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78 // f(m2) = t2
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79 // t1 = m1*a + b <=> b = t1 - m1*a
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80 // t2 = m2*a + b
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81
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82 // t1 - t2 = a*(m1 - m2)
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83 // a = (t1-t2)/(m1 - m2) for m1 != m2
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84
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85 if m1 == m2 {
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86 t := t1.Add(t2.Sub(t1) / 2)
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87 return func(float64) time.Time { return t }
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88 }
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89
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90 a := t1.Sub(t2).Seconds() / (m1 - m2)
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91 b := t1.Sub(utc0).Seconds() - m1*a
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92
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93 return func(m float64) time.Time {
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94 x := m*a + b
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95 secs := math.Ceil(x)
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96 nsecs := math.Ceil((x - secs) * (999999999 + 1))
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97 return time.Unix(int64(secs), int64(nsecs))
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98 }
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99 }
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100
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101 // MinTime returns the earlier time of a and b.
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102 func MinTime(a, b time.Time) time.Time {
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103 if a.Before(b) {
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104 return a
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105 }
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106 return b
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107 }
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108
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109 // MaxTime returns the later time of a and b.
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110 func MaxTime(a, b time.Time) time.Time {
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111 if a.After(b) {
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112 return a
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113 }
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114 return b
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115 }
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116
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117 // OrderTime orders the times a and b ascendingly.
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118 func OrderTime(a, b time.Time) (time.Time, time.Time) {
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119 if a.Before(b) {
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120 return a, b
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121 }
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122 return b, a
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123 }
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124
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125 // Dusk returns the beginning of the day the time t is in.
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126 func Dusk(t time.Time) time.Time {
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127 return time.Date(
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128 t.Year(),
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129 t.Month(),
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130 t.Day(),
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131 0, 0, 0, 0,
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132 t.Location())
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133 }
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134
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135 // Dawn returns the last time of the day the time t is in.
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136 func Dawn(t time.Time) time.Time {
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137 return time.Date(
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138 t.Year(),
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139 t.Month(),
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140 t.Day(),
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141 23, 59, 59, 999999999,
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142 t.Location())
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143 }