Mercurial > gemma

annotate pkg/scheduler/scheduler.go @ 3235:0c5a28ffe9ee

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available_fairway_depth: flexible layouting options
author Thomas Junk <thomas.junk@intevation.de>
date Fri, 10 May 2019 10:49:37 +0200
parents e9ff3e8d3c46
children 64324aaeb1fb
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 var numJobs int
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82
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83 for {
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84 var ba BoundAction
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85 ok, err := next(&ba)
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86 if err != nil {
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87 return err
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88 }
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89 if !ok {
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90 break
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91 }
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92 schedule, err := cron.Parse(ba.Spec)
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93 if err != nil {
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94 return err
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95 }
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96 job := &userAction{
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97 scheduler: s,
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98 name: ba.Name,
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99 cfgID: ba.CfgID,
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100 }
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101 cr.Schedule(schedule, job)
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102 numJobs++
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103 }
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104
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105 log.Printf("info: booting %d scheduler jobs from database.\n", numJobs)
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106
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107 s.mu.Lock()
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108 defer s.mu.Unlock()
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109
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110 s.cr.Stop()
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111 s.cr = cr
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112 cr.Start()
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113
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114 return nil
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115 }
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116
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117 // BindAction binds a named action to a cron spec and
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118 // a configuration id.
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119 func BindAction(name, spec string, cfgID int64) error {
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120 return global.bindAction(name, spec, cfgID)
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121 }
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122
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123 // UnbindAction unbinds a named action from a user and
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124 // a configuration id.
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125 func UnbindAction(name string, cfgID int64) {
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126 global.unbindAction(name, cfgID)
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127 }
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128
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129 // UnbindByID unbinds all schedules with a given id.
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130 func UnbindByID(cfgID int64) {
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131 global.unbindByID(cfgID)
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132 }
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133
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134 // UnbindByIDs unbinds all schedules for a given user.
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135 func UnbindByIDs(ids map[int64]struct{}) {
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136 global.unbindByIDs(ids)
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137 }
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138
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139 // HasAction asks if there is an action with a given name.
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140 func HasAction(name string) bool {
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141 return global.hasAction(name)
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142 }
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143
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144 func (s *scheduler) hasAction(name string) bool {
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145 s.mu.Lock()
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146 defer s.mu.Unlock()
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147 return s.actions[name] != nil
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148 }
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149
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150 func (s *scheduler) unbindByIDs(ids map[int64]struct{}) {
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151 s.mu.Lock()
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152 defer s.mu.Unlock()
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153
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154 entries := s.cr.Entries()
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155
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156 if len(entries) == 0 {
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157 return
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158 }
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159
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160 var found bool
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161 for _, entry := range entries {
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162 ua := entry.Job.(*userAction)
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163 if _, found = ids[ua.cfgID]; found {
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164 break
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165 }
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166 }
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167 if !found {
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168 return
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169 }
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170
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171 s.cr.Stop()
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172 s.cr = cron.New()
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173 for _, entry := range entries {
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174 ua := entry.Job.(*userAction)
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175 if _, found := ids[ua.cfgID]; !found {
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176 s.cr.Schedule(entry.Schedule, entry.Job)
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177 }
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178 }
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179 s.cr.Start()
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180 }
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181
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182 func (s *scheduler) unbindByID(cfgID int64) {
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183 s.mu.Lock()
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184 defer s.mu.Unlock()
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185
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186 entries := s.cr.Entries()
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187
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188 var found bool
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189 for _, entry := range entries {
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190 ua := entry.Job.(*userAction)
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191 if ua.cfgID == cfgID {
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192 found = true
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193 break
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194 }
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195 }
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196
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197 if !found {
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198 return
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199 }
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200
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201 s.cr.Stop()
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202 s.cr = cron.New()
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203 for _, entry := range entries {
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204 ua := entry.Job.(*userAction)
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205 if ua.cfgID != cfgID {
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206 s.cr.Schedule(entry.Schedule, entry.Job)
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207 }
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208 }
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209 s.cr.Start()
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210 }
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211
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212 func (s *scheduler) unbindAction(name string, cfgID int64) {
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213 s.mu.Lock()
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214 defer s.mu.Unlock()
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215
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216 entries := s.cr.Entries()
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217
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218 var found *userAction
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219 for _, entry := range entries {
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220 ua := entry.Job.(*userAction)
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221 if ua.name == name && cfgID == ua.cfgID {
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222 // Already have such a action/cfg tuple -> re-schedule.
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223 found = ua
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224 break
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225 }
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226 }
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227
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228 if found == nil {
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229 return
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230 }
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231
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232 s.cr.Stop()
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233 s.cr = cron.New()
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234 for _, entry := range entries {
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235 ua := entry.Job.(*userAction)
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236 if ua != found {
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237 s.cr.Schedule(entry.Schedule, entry.Job)
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238 }
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239 }
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240 s.cr.Start()
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241 }
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242
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243 func (s *scheduler) bindAction(name, spec string, cfgID int64) error {
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244
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245 schedule, err := cron.Parse(spec)
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246 if err != nil {
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247 return err
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248 }
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249
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250 s.mu.Lock()
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251 defer s.mu.Unlock()
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252
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253 entries := s.cr.Entries()
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254
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255 var found *userAction
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256 for _, entry := range entries {
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257 ua := entry.Job.(*userAction)
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258 if ua.name == name && cfgID == ua.cfgID {
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259 // Already have such a user/action/cfg tuple -> re-schedule.
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260 found = ua
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261 break
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262 }
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263 }
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264
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265 if found == nil {
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266 // Add to current plan.
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267 job := &userAction{scheduler: s, name: name, cfgID: cfgID}
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268 s.cr.Schedule(schedule, job)
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269 } else {
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270 // If found re-build all.
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271 s.cr.Stop()
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272 s.cr = cron.New()
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273 for _, entry := range entries {
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diff changeset
274 ua := entry.Job.(*userAction)
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275 var sch cron.Schedule
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276 if found == ua {
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277 // replace with new schedule.
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278 sch = schedule
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279 } 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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280 sch = entry.Schedule
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281 }
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diff changeset
282 s.cr.Schedule(sch, entry.Job)
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283 }
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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284 }
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
285 s.cr.Start()
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286
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diff changeset
287 return nil
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288 }
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289
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
290 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
291 s.mu.Lock()
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diff changeset
292 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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diff changeset
293 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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294 }
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
295
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
296 func (s *scheduler) registerAction(name string, action Action) {
1551
d9eba69f6515 Registered a dummy callback function for scheduled fairway imports in the scheduler.
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diff changeset
297 log.Printf("info: register action '%s' in scheduler.", name)
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diff changeset
298 s.mu.Lock()
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diff changeset
299 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
300 s.actions[name] = action
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parents:
diff changeset
301 }
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
302
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
303 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
304 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.
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diff changeset
305 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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diff changeset
306 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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diff changeset
307 }