Mercurial > gemma
annotate pkg/imports/queue.go @ 1327:cabf4789e02b
To make golint happier made context.Context to be the first argument of auth.RunAs.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sun, 25 Nov 2018 15:56:07 +0100 |
parents | 58acc343b1b6 |
children | d753ce6cf588 |
rev | line source |
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1017
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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 imports |
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15 |
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16 import ( |
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17 "context" |
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18 "database/sql" |
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19 "fmt" |
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20 "log" |
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21 "runtime/debug" |
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22 "sync" |
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23 "time" |
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24 |
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25 "github.com/jackc/pgx/pgtype" |
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26 |
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27 "gemma.intevation.de/gemma/pkg/auth" |
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28 "gemma.intevation.de/gemma/pkg/config" |
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29 ) |
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30 |
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31 type ( |
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32 Feedback interface { |
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33 Info(fmt string, args ...interface{}) |
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34 Warn(fmt string, args ...interface{}) |
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35 Error(fmt string, args ...interface{}) |
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36 } |
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37 |
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38 Job interface { |
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39 Do(int64, context.Context, *sql.Conn, Feedback) error |
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40 CleanUp() error |
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41 } |
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42 |
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43 JobKind string |
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44 |
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45 JobCreator interface { |
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46 Create(kind JobKind, data string) (Job, error) |
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47 Depends() []string |
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48 StageDone(*sql.Tx, context.Context, int64) error |
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49 } |
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50 |
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51 idJob struct { |
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52 id int64 |
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53 kind JobKind |
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54 user string |
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55 data string |
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56 } |
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57 ) |
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58 |
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59 const pollDuration = time.Second * 10 |
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60 |
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61 type importQueue struct { |
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62 signalChan chan struct{} |
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63 creatorsMu sync.Mutex |
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64 creators map[JobKind]JobCreator |
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65 usedDeps map[string]struct{} |
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66 } |
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67 |
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68 var iqueue = importQueue{ |
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69 signalChan: make(chan struct{}), |
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70 creators: map[JobKind]JobCreator{}, |
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71 usedDeps: map[string]struct{}{}, |
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72 } |
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73 |
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74 var ( |
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75 ImportStateNames = []string{ |
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76 "queued", |
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77 "running", |
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78 "failed", |
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79 "pending", |
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80 "accepted", |
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81 "declined", |
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82 } |
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83 ) |
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84 |
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85 const ( |
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86 queueUser = "sys_admin" |
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87 |
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88 reEnqueueRunningSQL = ` |
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89 UPDATE waterway.imports SET state = 'queued'::waterway.import_state |
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90 WHERE state = 'running'::waterway.import_state |
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91 ` |
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92 |
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93 insertJobSQL = ` |
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94 INSERT INTO waterway.imports ( |
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95 kind, |
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96 username, |
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97 data |
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98 ) VALUES ( |
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99 $1, |
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100 $2, |
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101 $3 |
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102 ) RETURNING id` |
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103 |
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104 selectJobSQL = ` |
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105 SELECT |
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106 id, |
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107 kind, |
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108 username, |
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109 data |
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110 FROM waterway.imports |
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111 WHERE state = 'queued'::waterway.import_state AND enqueued IN ( |
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112 SELECT min(enqueued) |
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113 FROM waterway.imports |
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114 WHERE state = 'queued'::waterway.import_state AND |
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115 kind = ANY($1) |
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116 ) |
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117 LIMIT 1 |
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118 ` |
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119 updateStateSQL = ` |
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120 UPDATE waterway.imports SET state = $1::waterway.import_state |
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121 WHERE id = $2 |
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122 ` |
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123 logMessageSQL = ` |
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124 INSERT INTO waterway.import_logs ( |
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125 import_id, |
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126 kind, |
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127 msg |
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128 ) VALUES ( |
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129 $1, |
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130 $2::waterway.log_type, |
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131 $3 |
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132 )` |
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133 ) |
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134 |
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135 func init() { |
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136 go iqueue.importLoop() |
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137 } |
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138 |
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139 func (q *importQueue) registerJobCreator(kind JobKind, jc JobCreator) { |
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140 q.creatorsMu.Lock() |
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141 defer q.creatorsMu.Unlock() |
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142 q.creators[kind] = jc |
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143 } |
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144 |
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145 func FindJobCreator(kind JobKind) JobCreator { |
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146 return iqueue.jobCreator(kind) |
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147 } |
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148 |
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149 func RegisterJobCreator(kind JobKind, jc JobCreator) { |
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150 log.Printf("info: register import job creator for kind '%s'\n", kind) |
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151 iqueue.registerJobCreator(kind, jc) |
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152 } |
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153 |
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154 func (q *importQueue) jobCreator(kind JobKind) JobCreator { |
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155 q.creatorsMu.Lock() |
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156 defer q.creatorsMu.Unlock() |
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157 return q.creators[kind] |
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158 } |
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159 |
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160 func (q *importQueue) addJob(kind JobKind, user, data string) (int64, error) { |
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161 ctx := context.Background() |
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162 var id int64 |
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163 err := auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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164 return conn.QueryRowContext(ctx, insertJobSQL, string(kind), user, data).Scan(&id) |
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165 }) |
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166 if err == nil { |
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167 select { |
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168 case q.signalChan <- struct{}{}: |
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169 default: |
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170 } |
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171 } |
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172 return id, err |
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173 } |
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174 |
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175 func AddJob(kind JobKind, user, data string) (int64, error) { |
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176 return iqueue.addJob(kind, user, data) |
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177 } |
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178 |
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179 type logFeedback int64 |
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180 |
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181 func (lf logFeedback) log(kind, format string, args ...interface{}) { |
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182 ctx := context.Background() |
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183 err := auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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184 _, err := conn.ExecContext( |
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185 ctx, logMessageSQL, int64(lf), kind, fmt.Sprintf(format, args...)) |
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186 return err |
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187 }) |
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188 if err != nil { |
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189 log.Printf("logging failed: %v\n", err) |
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190 } |
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191 } |
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192 |
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193 func (lf logFeedback) Info(format string, args ...interface{}) { |
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194 lf.log("info", format, args...) |
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195 } |
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196 |
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197 func (lf logFeedback) Warn(format string, args ...interface{}) { |
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198 lf.log("warn", format, args...) |
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199 } |
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200 |
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201 func (lf logFeedback) Error(format string, args ...interface{}) { |
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202 lf.log("error", format, args...) |
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203 } |
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204 |
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205 func survive(fn func() error) func() error { |
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206 return func() (err error) { |
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207 defer func() { |
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208 if p := recover(); p != nil { |
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209 err = fmt.Errorf("%v: %s", p, string(debug.Stack())) |
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210 } |
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211 }() |
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212 return fn() |
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213 } |
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214 } |
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215 |
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216 func reEnqueueRunning() error { |
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217 ctx := context.Background() |
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218 return auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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219 _, err := conn.ExecContext(ctx, reEnqueueRunningSQL) |
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220 return err |
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221 }) |
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222 } |
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223 |
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224 func (q *importQueue) fetchJob() (*idJob, error) { |
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225 |
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226 var which []string |
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227 |
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228 q.creatorsMu.Lock() |
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229 nextCreator: |
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230 for kind, jc := range q.creators { |
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231 for _, d := range jc.Depends() { |
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232 if _, found := q.usedDeps[d]; found { |
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233 continue nextCreator |
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234 } |
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235 } |
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236 which = append(which, string(kind)) |
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237 } |
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238 q.creatorsMu.Unlock() |
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239 |
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240 if len(which) == 0 { |
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241 return nil, sql.ErrNoRows |
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242 } |
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243 |
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244 var kinds pgtype.TextArray |
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245 if err := kinds.Set(which); err != nil { |
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246 return nil, err |
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247 } |
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248 |
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249 var ji idJob |
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250 ctx := context.Background() |
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251 err := auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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252 tx, err := conn.BeginTx(ctx, nil) |
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253 if err != nil { |
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254 return err |
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255 } |
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256 defer tx.Rollback() |
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257 if err = tx.QueryRowContext(ctx, selectJobSQL, &kinds).Scan( |
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258 &ji.id, &ji.kind, &ji.user, &ji.data); err != nil { |
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259 return err |
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260 } |
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261 _, err = tx.ExecContext(ctx, updateStateSQL, "running", ji.id) |
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262 if err == nil { |
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263 err = tx.Commit() |
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264 } |
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265 return err |
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266 }) |
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267 switch { |
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268 case err == sql.ErrNoRows: |
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269 return nil, nil |
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270 case err != nil: |
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271 return nil, err |
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272 } |
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273 return &ji, nil |
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274 } |
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275 |
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276 func updateState(id int64, state string) error { |
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277 ctx := context.Background() |
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278 return auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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279 _, err := conn.ExecContext(ctx, updateStateSQL, state, id) |
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280 return err |
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281 }) |
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282 } |
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283 |
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284 func errorAndFail(id int64, format string, args ...interface{}) error { |
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285 ctx := context.Background() |
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286 err := auth.RunAs(ctx, queueUser, func(conn *sql.Conn) error { |
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287 tx, err := conn.BeginTx(ctx, nil) |
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288 if err != nil { |
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289 return err |
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290 } |
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291 defer tx.Rollback() |
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292 _, err = conn.ExecContext( |
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293 ctx, logMessageSQL, id, "error", fmt.Sprintf(format, args...)) |
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294 if err != nil { |
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295 return err |
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296 } |
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297 _, err = conn.ExecContext( |
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298 ctx, updateStateSQL, "failed", id) |
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299 if err == nil { |
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300 err = tx.Commit() |
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301 } |
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302 return err |
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303 }) |
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304 return err |
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305 } |
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306 |
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307 func (q *importQueue) importLoop() { |
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308 config.WaitReady() |
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309 // re-enqueue the jobs that are in state running. |
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310 // They where in progess when the server went down. |
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311 if err := reEnqueueRunning(); err != nil { |
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312 log.Printf("re-enqueuing failed: %v", err) |
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313 } |
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314 |
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315 for { |
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316 var idj *idJob |
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317 var err error |
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318 |
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319 for { |
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320 if idj, err = q.fetchJob(); err != nil && err != sql.ErrNoRows { |
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321 log.Printf("db error: %v\n", err) |
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322 } |
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323 if idj != nil { |
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324 break |
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325 } |
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326 select { |
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327 case <-q.signalChan: |
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328 case <-time.After(pollDuration): |
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329 } |
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330 } |
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331 |
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332 log.Printf("starting import #%d\n", idj.id) |
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333 |
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334 jc := q.jobCreator(idj.kind) |
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335 if jc == nil { |
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336 errorAndFail(idj.id, "no creator for kind '%s' found", idj.kind) |
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337 continue |
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338 } |
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339 |
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340 // Lock dependencies. |
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341 q.creatorsMu.Lock() |
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342 for _, d := range jc.Depends() { |
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343 q.usedDeps[d] = struct{}{} |
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344 } |
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345 q.creatorsMu.Unlock() |
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346 |
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347 go func(jc JobCreator, idj *idJob) { |
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348 |
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349 // Unlock the dependencies. |
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350 defer func() { |
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351 q.creatorsMu.Lock() |
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352 for _, d := range jc.Depends() { |
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353 delete(q.usedDeps, d) |
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354 } |
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355 q.creatorsMu.Unlock() |
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356 select { |
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357 case q.signalChan <- struct{}{}: |
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358 default: |
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359 } |
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360 }() |
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361 |
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362 job, err := jc.Create(idj.kind, idj.data) |
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363 if err != nil { |
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364 errorAndFail(idj.id, "failed to create job for import #%d: %v", |
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365 idj.id, err) |
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366 return |
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367 } |
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368 |
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369 feedback := logFeedback(idj.id) |
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370 |
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371 feedback.Info("import #%d started", idj.id) |
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372 |
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373 errDo := survive(func() error { |
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374 ctx := context.Background() |
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375 return auth.RunAs(ctx, idj.user, |
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376 func(conn *sql.Conn) error { |
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377 return job.Do(idj.id, ctx, conn, feedback) |
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378 }) |
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379 })() |
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380 if errDo != nil { |
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381 feedback.Error("error do: %v", errDo) |
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382 } |
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383 errCleanup := survive(job.CleanUp)() |
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384 if errCleanup != nil { |
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385 feedback.Error("error cleanup: %v", errCleanup) |
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386 } |
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387 |
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388 var state string |
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389 if errDo != nil || errCleanup != nil { |
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390 state = "failed" |
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391 } else { |
1190
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The imort queue has now six states:
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392 state = "pending" |
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393 } |
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394 if err := updateState(idj.id, state); err != nil { |
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395 log.Printf("setting state of job %d failed: %v\n", idj.id, err) |
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396 } |
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397 log.Printf("import #%d finished: %s\n", idj.id, state) |
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398 }(jc, idj) |
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399 } |
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400 } |