Mercurial > gemma

annotate pkg/scheduler/scheduler.go @ 5490:5f47eeea988d logging

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Use own logging package.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 20 Sep 2021 17:45:39 +0200
parents 5826d4de0e40
children
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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 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
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14 package scheduler
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15
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16 import (
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17 "sort"
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18 "strings"
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19 "sync"
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20
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21 cron "gopkg.in/robfig/cron.v1"
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22
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23 "gemma.intevation.de/gemma/pkg/log"
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24 )
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25
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26 // Action is called with a configuration id.
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27 type Action func(cfgID int64)
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28
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29 type userAction struct {
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30 scheduler *scheduler
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31 name string
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32 cfgID int64
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33 }
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34
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35 type scheduler struct {
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36 cr *cron.Cron
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37 actions map[string]Action
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38 mu sync.Mutex
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39 }
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40
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41 // Run implements cron.Job.
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42 func (ua *userAction) Run() {
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43 if a := ua.scheduler.action(ua.name); a != nil {
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44 a(ua.cfgID)
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45 } else {
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46 log.Warnf("scheduled action '%s' not found.", ua.name)
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47 }
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48 }
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49
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50 var global = scheduler{
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51 cr: cron.New(),
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52 actions: make(map[string]Action),
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53 }
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55 // RegisterAction registers a named action to the global scheduler.
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56 func RegisterAction(name string, action Action) {
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57 global.registerAction(name, action)
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58 }
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59
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60 // UnregisterAction ungesiters a named action from the global scheduler.
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61 func UnregisterAction(name string) {
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62 global.unregisterAction(name)
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63 }
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64
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65 // BoundAction is a complete set of infos for
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66 // an action to be bound to a schedule and
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67 // configuration id.
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68 type BoundAction struct {
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69 Name string
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70 Spec string
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71 CfgID int64
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72 }
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73
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74 // BootActions setup the global scheduler with a set
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75 // of bound actions delivered by the next function.
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76 func BootActions(next func(*BoundAction) (bool, error)) error {
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77 return global.bootActions(next)
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78 }
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79
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80 func (s *scheduler) bootActions(next func(*BoundAction) (bool, error)) error {
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81
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82 cr := cron.New()
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83
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84 var numJobs int
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85
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86 for {
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87 var ba BoundAction
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88 ok, err := next(&ba)
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89 if err != nil {
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90 return err
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91 }
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92 if !ok {
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93 break
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94 }
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95 schedule, err := cron.Parse(ba.Spec)
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96 if err != nil {
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97 return err
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98 }
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99 job := &userAction{
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100 scheduler: s,
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101 name: ba.Name,
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102 cfgID: ba.CfgID,
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103 }
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104 cr.Schedule(schedule, job)
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105 numJobs++
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106 }
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107
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108 log.Infof("booting %d scheduler jobs from database.\n", numJobs)
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109
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110 s.mu.Lock()
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111 defer s.mu.Unlock()
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112
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113 s.cr.Stop()
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114 s.cr = cr
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115 cr.Start()
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116
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117 return nil
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118 }
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119
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120 // BindAction binds a named action to a cron spec and
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121 // a configuration id.
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122 func BindAction(name, spec string, cfgID int64) error {
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123 return global.bindAction(name, spec, cfgID)
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124 }
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125
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126 // UnbindAction unbinds a named action from a user and
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127 // a configuration id.
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128 func UnbindAction(name string, cfgID int64) {
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129 global.unbindAction(name, cfgID)
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130 }
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131
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132 // UnbindByID unbinds all schedules with a given id.
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133 func UnbindByID(cfgID int64) {
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134 global.unbindByID(cfgID)
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135 }
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136
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137 // UnbindByIDs unbinds all schedules for a given user.
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138 func UnbindByIDs(ids map[int64]struct{}) {
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139 global.unbindByIDs(ids)
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140 }
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141
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142 // HasAction asks if there is an action with a given name.
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143 func HasAction(name string) bool {
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144 return global.hasAction(name)
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145 }
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146
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147 func (s *scheduler) hasAction(name string) bool {
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148 s.mu.Lock()
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149 defer s.mu.Unlock()
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150 return s.actions[name] != nil
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151 }
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152
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153 func (s *scheduler) unbindByIDs(ids map[int64]struct{}) {
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154 s.mu.Lock()
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155 defer s.mu.Unlock()
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156
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157 entries := s.cr.Entries()
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158
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159 if len(entries) == 0 {
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160 return
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161 }
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162
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163 var found bool
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164 for _, entry := range entries {
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165 ua := entry.Job.(*userAction)
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166 if _, found = ids[ua.cfgID]; found {
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167 break
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168 }
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169 }
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170 if !found {
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171 return
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172 }
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173
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174 s.cr.Stop()
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175 s.cr = cron.New()
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176 for _, entry := range entries {
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177 ua := entry.Job.(*userAction)
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178 if _, found := ids[ua.cfgID]; !found {
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179 s.cr.Schedule(entry.Schedule, entry.Job)
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180 }
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181 }
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182 s.cr.Start()
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183 }
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184
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185 func (s *scheduler) unbindByID(cfgID int64) {
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186 s.mu.Lock()
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187 defer s.mu.Unlock()
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188
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189 entries := s.cr.Entries()
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190
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191 var found bool
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192 for _, entry := range entries {
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193 ua := entry.Job.(*userAction)
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194 if ua.cfgID == cfgID {
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195 found = true
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196 break
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197 }
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198 }
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199
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200 if !found {
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201 return
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202 }
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203
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204 s.cr.Stop()
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205 s.cr = cron.New()
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206 for _, entry := range entries {
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207 ua := entry.Job.(*userAction)
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208 if ua.cfgID != cfgID {
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209 s.cr.Schedule(entry.Schedule, entry.Job)
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210 }
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211 }
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212 s.cr.Start()
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213 }
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214
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215 func (s *scheduler) unbindAction(name string, cfgID int64) {
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216 s.mu.Lock()
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217 defer s.mu.Unlock()
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218
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219 entries := s.cr.Entries()
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220
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221 var found *userAction
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222 for _, entry := range entries {
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223 ua := entry.Job.(*userAction)
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224 if ua.name == name && cfgID == ua.cfgID {
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225 // Already have such a action/cfg tuple -> re-schedule.
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226 found = ua
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227 break
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228 }
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229 }
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230
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231 if found == nil {
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232 return
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233 }
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234
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235 s.cr.Stop()
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236 s.cr = cron.New()
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237 for _, entry := range entries {
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238 ua := entry.Job.(*userAction)
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239 if ua != found {
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240 s.cr.Schedule(entry.Schedule, entry.Job)
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241 }
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242 }
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243 s.cr.Start()
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244 }
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245
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246 func (s *scheduler) bindAction(name, spec string, cfgID int64) error {
1541
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247
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248 schedule, err := cron.Parse(spec)
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249 if err != nil {
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250 return err
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251 }
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252
1540
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253 s.mu.Lock()
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254 defer s.mu.Unlock()
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255
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diff changeset
256 entries := s.cr.Entries()
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257
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258 var found *userAction
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259 for _, entry := range entries {
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260 ua := entry.Job.(*userAction)
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diff changeset
261 if ua.name == name && cfgID == ua.cfgID {
1541
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262 // Already have such a user/action/cfg tuple -> re-schedule.
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263 found = ua
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diff changeset
264 break
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265 }
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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266 }
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267
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diff changeset
268 if found == nil {
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269 // Add to current plan.
1654
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diff changeset
270 job := &userAction{scheduler: s, name: name, cfgID: cfgID}
1541
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diff changeset
271 s.cr.Schedule(schedule, job)
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272 } else {
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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273 // If found re-build all.
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diff changeset
274 s.cr.Stop()
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275 s.cr = cron.New()
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diff changeset
276 for _, entry := range entries {
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diff changeset
277 ua := entry.Job.(*userAction)
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diff changeset
278 var sch cron.Schedule
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diff changeset
279 if found == ua {
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diff changeset
280 // replace with new schedule.
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281 sch = schedule
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282 } else {
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
283 sch = entry.Schedule
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284 }
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diff changeset
285 s.cr.Schedule(sch, entry.Job)
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286 }
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diff changeset
287 }
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
288 s.cr.Start()
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diff changeset
289
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diff changeset
290 return nil
1540
251ee25accce Droped on scheduler in favor for a third party library.
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parents:
diff changeset
291 }
251ee25accce Droped on scheduler in favor for a third party library.
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diff changeset
292
1541
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diff changeset
293 func (s *scheduler) action(name string) Action {
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
294 s.mu.Lock()
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diff changeset
295 defer s.mu.Unlock()
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diff changeset
296 return s.actions[name]
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
297 }
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
298
4176
c9315a6eb2c2 Made 'golint' and 'staticcheck' happy with scheduler package.
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parents: 3246
diff changeset
299 // LogActionNames logs a sorted list of registered scheduler functions.
3246
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
300 func LogActionNames() {
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
301 names := global.actionNames()
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diff changeset
302 sort.Strings(names)
5490
5f47eeea988d Use own logging package.
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parents: 4411
diff changeset
303 log.Infof("actions registered to scheduler: %s\n",
3246
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
304 strings.Join(names, ", "))
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diff changeset
305 }
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
306
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
307 func (s *scheduler) actionNames() []string {
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
308 s.mu.Lock()
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
309 defer s.mu.Unlock()
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
310 names := make([]string, len(s.actions))
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
311 var i int
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
312 for k := range s.actions {
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
313 names[i] = k
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
314 i++
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
315 }
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
316 return names
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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diff changeset
317 }
64324aaeb1fb Made logging of waht is registered to the scheduler and the import queue more deterministic.
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parents: 2955
diff changeset
318
1541
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parents: 1540
diff changeset
319 func (s *scheduler) registerAction(name string, action Action) {
1540
251ee25accce Droped on scheduler in favor for a third party library.
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parents:
diff changeset
320 s.mu.Lock()
251ee25accce Droped on scheduler in favor for a third party library.
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parents:
diff changeset
321 defer s.mu.Unlock()
1541
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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diff changeset
322 s.actions[name] = action
1540
251ee25accce Droped on scheduler in favor for a third party library.
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parents:
diff changeset
323 }
1541
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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parents: 1540
diff changeset
324
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1540
diff changeset
325 func (s *scheduler) unregisterAction(name string) {
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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parents: 1540
diff changeset
326 s.mu.Lock()
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1540
diff changeset
327 defer s.mu.Unlock()
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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parents: 1540
diff changeset
328 delete(s.actions, name)
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
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parents: 1540
diff changeset
329 }