Mercurial > gemma

annotate pkg/scheduler/scheduler.go @ 2672:b997e1fd1d3d import-overview-rework

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Fixed warning SQL prefix for selection.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 14 Mar 2019 17:29:36 +0100
parents 6691bf76af1c
children e9ff3e8d3c46
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "log"
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18 "sync"
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19
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20 "github.com/robfig/cron"
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21 )
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22
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23 // Action is called with a configuration id.
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24 type Action func(cfgID int64)
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25
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26 type userAction struct {
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27 scheduler *scheduler
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28 name string
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29 cfgID int64
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30 }
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31
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32 type scheduler struct {
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33 cr *cron.Cron
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34 actions map[string]Action
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35 mu sync.Mutex
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36 }
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37
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38 // Run implements cron.Job.
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39 func (ua *userAction) Run() {
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40 if a := ua.scheduler.action(ua.name); a != nil {
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41 a(ua.cfgID)
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42 } else {
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43 log.Printf("warn: scheduled action '%s' not found.", ua.name)
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44 }
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45 }
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46
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47 var global = scheduler{
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48 cr: cron.New(),
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49 actions: make(map[string]Action),
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50 }
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51
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52 // RegisterAction registers a named action to the global scheduler.
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53 func RegisterAction(name string, action Action) {
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54 global.registerAction(name, action)
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55 }
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57 // UnregisterAction ungesiters a named action from the global scheduler.
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58 func UnregisterAction(name string) {
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59 global.unregisterAction(name)
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60 }
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61
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62 // BoundAction is a complete set of infos for
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63 // an action to be bound to a schedule and
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64 // configuration id.
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65 type BoundAction struct {
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66 Name string
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67 Spec string
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68 CfgID int64
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69 }
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70
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71 // BootActions setup the global scheduler with a set
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72 // of bound actions delivered by the next function.
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73 func BootActions(next func(*BoundAction) (bool, error)) error {
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74 return global.bootActions(next)
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75 }
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76
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77 func (s *scheduler) bootActions(next func(*BoundAction) (bool, error)) error {
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78
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79 cr := cron.New()
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80
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81 for {
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82 var ba BoundAction
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83 ok, err := next(&ba)
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84 if err != nil {
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85 return err
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86 }
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87 if !ok {
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88 break
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89 }
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90 schedule, err := cron.Parse(ba.Spec)
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91 if err != nil {
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92 return err
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93 }
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94 job := &userAction{
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95 scheduler: s,
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96 name: ba.Name,
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97 cfgID: ba.CfgID,
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98 }
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99 cr.Schedule(schedule, job)
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100 }
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101
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102 s.mu.Lock()
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103 defer s.mu.Unlock()
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104
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105 s.cr.Stop()
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106 s.cr = cr
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107 cr.Start()
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108
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109 return nil
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110 }
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111
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112 // BindAction binds a named action to a cron spec and
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113 // a configuration id.
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114 func BindAction(name, spec string, cfgID int64) error {
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115 return global.bindAction(name, spec, cfgID)
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116 }
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117
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118 // UnbindAction unbinds a named action from a user and
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119 // a configuration id.
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120 func UnbindAction(name string, cfgID int64) {
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121 global.unbindAction(name, cfgID)
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122 }
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123
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124 // UnbindByID unbinds all schedules with a given id.
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125 func UnbindByID(cfgID int64) {
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126 global.unbindByID(cfgID)
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127 }
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128
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129 // UnbindByIDs unbinds all schedules for a given user.
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130 func UnbindByIDs(ids map[int64]struct{}) {
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131 global.unbindByIDs(ids)
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132 }
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133
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134 // HasAction asks if there is an action with a given name.
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135 func HasAction(name string) bool {
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136 return global.hasAction(name)
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137 }
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138
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139 func (s *scheduler) hasAction(name string) bool {
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140 s.mu.Lock()
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141 defer s.mu.Unlock()
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142 return s.actions[name] != nil
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143 }
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144
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145 func (s *scheduler) unbindByIDs(ids map[int64]struct{}) {
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146 s.mu.Lock()
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147 defer s.mu.Unlock()
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148
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149 entries := s.cr.Entries()
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150
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151 if len(entries) == 0 {
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152 return
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153 }
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154
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155 var found bool
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156 for _, entry := range entries {
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157 ua := entry.Job.(*userAction)
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158 if _, found = ids[ua.cfgID]; found {
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159 break
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160 }
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161 }
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162 if !found {
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163 return
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164 }
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165
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166 s.cr.Stop()
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167 s.cr = cron.New()
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168 for _, entry := range entries {
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169 ua := entry.Job.(*userAction)
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170 if _, found := ids[ua.cfgID]; !found {
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171 s.cr.Schedule(entry.Schedule, entry.Job)
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172 }
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173 }
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174 s.cr.Start()
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175 }
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176
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177 func (s *scheduler) unbindByID(cfgID int64) {
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178 s.mu.Lock()
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179 defer s.mu.Unlock()
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180
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181 entries := s.cr.Entries()
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182
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183 var found bool
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184 for _, entry := range entries {
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185 ua := entry.Job.(*userAction)
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186 if ua.cfgID == cfgID {
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187 found = true
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188 break
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189 }
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190 }
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191
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192 if !found {
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193 return
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194 }
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195
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196 s.cr.Stop()
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197 s.cr = cron.New()
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198 for _, entry := range entries {
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199 ua := entry.Job.(*userAction)
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200 if ua.cfgID != cfgID {
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201 s.cr.Schedule(entry.Schedule, entry.Job)
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202 }
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203 }
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204 s.cr.Start()
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205 }
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206
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207 func (s *scheduler) unbindAction(name string, cfgID int64) {
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208 s.mu.Lock()
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209 defer s.mu.Unlock()
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210
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211 entries := s.cr.Entries()
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212
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213 var found *userAction
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214 for _, entry := range entries {
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215 ua := entry.Job.(*userAction)
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216 if ua.name == name && cfgID == ua.cfgID {
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217 // Already have such a action/cfg tuple -> re-schedule.
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218 found = ua
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219 break
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220 }
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221 }
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222
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223 if found == nil {
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224 return
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225 }
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226
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227 s.cr.Stop()
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228 s.cr = cron.New()
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229 for _, entry := range entries {
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230 ua := entry.Job.(*userAction)
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231 if ua != found {
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232 s.cr.Schedule(entry.Schedule, entry.Job)
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233 }
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234 }
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235 s.cr.Start()
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236 }
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237
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238 func (s *scheduler) bindAction(name, spec string, cfgID int64) error {
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239
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240 schedule, err := cron.Parse(spec)
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241 if err != nil {
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242 return err
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243 }
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244
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245 s.mu.Lock()
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246 defer s.mu.Unlock()
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247
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248 entries := s.cr.Entries()
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249
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250 var found *userAction
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251 for _, entry := range entries {
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252 ua := entry.Job.(*userAction)
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253 if ua.name == name && cfgID == ua.cfgID {
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254 // Already have such a user/action/cfg tuple -> re-schedule.
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255 found = ua
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256 break
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257 }
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258 }
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259
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260 if found == nil {
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261 // Add to current plan.
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262 job := &userAction{scheduler: s, name: name, cfgID: cfgID}
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263 s.cr.Schedule(schedule, job)
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264 } else {
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265 // If found re-build all.
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266 s.cr.Stop()
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267 s.cr = cron.New()
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268 for _, entry := range entries {
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269 ua := entry.Job.(*userAction)
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270 var sch cron.Schedule
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271 if found == ua {
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272 // replace with new schedule.
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273 sch = schedule
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274 } else {
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275 sch = entry.Schedule
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276 }
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277 s.cr.Schedule(sch, entry.Job)
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278 }
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279 }
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280 s.cr.Start()
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281
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282 return nil
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283 }
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284
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285 func (s *scheduler) action(name string) Action {
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286 s.mu.Lock()
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287 defer s.mu.Unlock()
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288 return s.actions[name]
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289 }
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290
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diff changeset
291 func (s *scheduler) registerAction(name string, action Action) {
1551
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292 log.Printf("info: register action '%s' in scheduler.", name)
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293 s.mu.Lock()
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294 defer s.mu.Unlock()
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295 s.actions[name] = action
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296 }
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297
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298 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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diff changeset
299 s.mu.Lock()
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diff changeset
300 defer s.mu.Unlock()
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diff changeset
301 delete(s.actions, name)
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302 }