Mercurial > gemma
annotate pkg/imports/queue.go @ 1138:443fc80a315f
Don't issue new lines at end of log messages when importing.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 09 Nov 2018 10:57:49 +0100 |
parents | a5069da2f0b7 |
children | 930fdd8b474f |
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(*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 } |
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49 |
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50 idJob struct { |
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51 id int64 |
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52 kind JobKind |
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53 user string |
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54 data string |
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55 } |
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56 ) |
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Store job id alongside to job in job queue.
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57 |
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58 const pollDuration = time.Second * 10 |
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59 |
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60 type importQueue struct { |
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61 signalChan chan struct{} |
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62 creatorsMu sync.Mutex |
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63 creators map[JobKind]JobCreator |
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64 usedDeps map[string]struct{} |
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65 } |
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66 |
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67 var iqueue = importQueue{ |
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68 signalChan: make(chan struct{}), |
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69 creators: map[JobKind]JobCreator{}, |
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70 usedDeps: map[string]struct{}{}, |
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71 } |
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72 |
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73 const ( |
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74 queueUser = "sys_admin" |
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75 |
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76 reEnqueueRunningSQL = ` |
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77 UPDATE waterway.imports SET state = 'queued'::waterway.import_state |
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78 WHERE state = 'running'::waterway.import_state |
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79 ` |
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80 |
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81 insertJobSQL = ` |
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82 INSERT INTO waterway.imports ( |
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83 kind, |
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84 username, |
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85 data |
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86 ) VALUES ( |
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87 $1, |
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88 $2, |
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89 $3 |
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90 ) RETURNING id` |
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91 |
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92 selectJobSQL = ` |
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93 SELECT |
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94 id, |
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95 kind, |
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96 username, |
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97 data |
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98 FROM waterway.imports |
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99 WHERE state = 'queued'::waterway.import_state AND enqueued IN ( |
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100 SELECT min(enqueued) |
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101 FROM waterway.imports |
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102 WHERE state = 'queued'::waterway.import_state AND |
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103 kind = ANY($1) |
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104 ) |
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105 LIMIT 1 |
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106 ` |
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107 updateStateSQL = ` |
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108 UPDATE waterway.imports SET state = $1::waterway.import_state |
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109 WHERE id = $2 |
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110 ` |
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111 logMessageSQL = ` |
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112 INSERT INTO waterway.import_logs ( |
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113 import_id, |
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114 kind, |
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115 msg |
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116 ) VALUES ( |
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117 $1, |
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118 $2::waterway.log_type, |
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119 $3 |
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120 )` |
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121 ) |
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122 |
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123 func init() { |
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124 go iqueue.importLoop() |
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125 } |
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126 |
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127 func (q *importQueue) registerJobCreator(kind JobKind, jc JobCreator) { |
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128 q.creatorsMu.Lock() |
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129 defer q.creatorsMu.Unlock() |
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130 q.creators[kind] = jc |
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131 } |
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132 |
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133 func RegisterJobCreator(kind JobKind, jc JobCreator) { |
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134 log.Printf("info: register import job creator for kind '%s'\n", kind) |
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135 iqueue.registerJobCreator(kind, jc) |
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136 } |
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137 |
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138 func (q *importQueue) jobCreator(kind JobKind) JobCreator { |
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139 q.creatorsMu.Lock() |
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140 defer q.creatorsMu.Unlock() |
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141 return q.creators[kind] |
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142 } |
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143 |
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144 func (q *importQueue) addJob(kind JobKind, user, data string) (int64, error) { |
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145 ctx := context.Background() |
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146 var id int64 |
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147 err := auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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148 return conn.QueryRowContext(ctx, insertJobSQL, string(kind), user, data).Scan(&id) |
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149 }) |
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150 if err == nil { |
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151 select { |
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152 case q.signalChan <- struct{}{}: |
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153 default: |
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154 } |
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155 } |
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156 return id, err |
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157 } |
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158 |
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159 func AddJob(kind JobKind, user, data string) (int64, error) { |
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160 return iqueue.addJob(kind, user, data) |
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161 } |
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162 |
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163 type logFeedback int64 |
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164 |
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165 func (lf logFeedback) log(kind, format string, args ...interface{}) { |
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166 ctx := context.Background() |
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167 err := auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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168 _, err := conn.ExecContext( |
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169 ctx, logMessageSQL, int64(lf), kind, fmt.Sprintf(format, args...)) |
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170 return err |
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171 }) |
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172 if err != nil { |
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173 log.Printf("logging failed: %v\n", err) |
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174 } |
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175 } |
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176 |
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177 func (lf logFeedback) Info(format string, args ...interface{}) { |
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178 lf.log("info", format, args...) |
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179 } |
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180 |
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181 func (lf logFeedback) Warn(format string, args ...interface{}) { |
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182 lf.log("warn", format, args...) |
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183 } |
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184 |
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185 func (lf logFeedback) Error(format string, args ...interface{}) { |
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186 lf.log("error", format, args...) |
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187 } |
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188 |
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189 func survive(fn func() error) func() error { |
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190 return func() (err error) { |
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191 defer func() { |
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192 if p := recover(); p != nil { |
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193 err = fmt.Errorf("%v: %s", p, string(debug.Stack())) |
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194 } |
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195 }() |
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196 return fn() |
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197 } |
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198 } |
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199 |
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200 func reEnqueueRunning() error { |
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201 ctx := context.Background() |
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202 return auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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203 _, err := conn.ExecContext(ctx, reEnqueueRunningSQL) |
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204 return err |
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205 }) |
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206 } |
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207 |
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208 func (q *importQueue) fetchJob() (*idJob, error) { |
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209 |
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210 var which []string |
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211 |
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212 q.creatorsMu.Lock() |
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213 nextCreator: |
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214 for kind, jc := range q.creators { |
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215 for _, d := range jc.Depends() { |
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216 if _, found := q.usedDeps[d]; found { |
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217 continue nextCreator |
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218 } |
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219 } |
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220 which = append(which, string(kind)) |
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221 } |
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222 q.creatorsMu.Unlock() |
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223 |
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224 if len(which) == 0 { |
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225 return nil, sql.ErrNoRows |
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226 } |
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227 |
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228 var kinds pgtype.TextArray |
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229 if err := kinds.Set(which); err != nil { |
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230 return nil, err |
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231 } |
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232 |
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233 var ji idJob |
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234 ctx := context.Background() |
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235 err := auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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236 tx, err := conn.BeginTx(ctx, nil) |
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237 if err != nil { |
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238 return err |
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239 } |
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240 defer tx.Rollback() |
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241 if err = tx.QueryRowContext(ctx, selectJobSQL, &kinds).Scan( |
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242 &ji.id, &ji.kind, &ji.user, &ji.data); err != nil { |
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243 return err |
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244 } |
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245 _, err = tx.ExecContext(ctx, updateStateSQL, "running", ji.id) |
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246 if err == nil { |
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247 err = tx.Commit() |
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248 } |
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249 return err |
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250 }) |
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251 switch { |
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252 case err == sql.ErrNoRows: |
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253 return nil, nil |
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254 case err != nil: |
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255 return nil, err |
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256 } |
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257 return &ji, nil |
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258 } |
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259 |
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260 func updateState(id int64, state string) error { |
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261 ctx := context.Background() |
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262 return auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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263 _, err := conn.ExecContext(ctx, updateStateSQL, state, id) |
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264 return err |
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265 }) |
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266 } |
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267 |
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268 func errorAndFail(id int64, format string, args ...interface{}) error { |
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269 ctx := context.Background() |
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270 err := auth.RunAs(queueUser, ctx, func(conn *sql.Conn) error { |
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271 tx, err := conn.BeginTx(ctx, nil) |
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272 if err != nil { |
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273 return err |
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274 } |
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275 defer tx.Rollback() |
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276 _, err = conn.ExecContext( |
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277 ctx, logMessageSQL, id, "error", fmt.Sprintf(format, args...)) |
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278 if err != nil { |
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279 return err |
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280 } |
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281 _, err = conn.ExecContext( |
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282 ctx, updateStateSQL, "failed", id) |
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283 if err == nil { |
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284 err = tx.Commit() |
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285 } |
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286 return err |
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287 }) |
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288 return err |
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289 } |
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290 |
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291 func (q *importQueue) importLoop() { |
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14425e35e3c2
Wait with start of import queue until configuration is fully loaded.
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292 config.WaitReady() |
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293 // re-enqueue the jobs that are in state running. |
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294 // They where in progess when the server went down. |
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295 if err := reEnqueueRunning(); err != nil { |
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Fixed and harmonized wording in importer queue a bit.
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296 log.Printf("re-enqueuing failed: %v", err) |
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297 } |
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298 |
958
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299 for { |
998
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300 var idj *idJob |
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301 var err error |
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302 |
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303 for { |
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304 if idj, err = q.fetchJob(); err != nil && err != sql.ErrNoRows { |
998
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305 log.Printf("db error: %v\n", err) |
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306 } |
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307 if idj != nil { |
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308 break |
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309 } |
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310 select { |
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311 case <-q.signalChan: |
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312 case <-time.After(pollDuration): |
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313 } |
958
2818ad6c7d32
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314 } |
998
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315 |
1010
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Fixed and harmonized wording in importer queue a bit.
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diff
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|
316 log.Printf("starting import #%d\n", idj.id) |
987
3841509f6e9e
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317 |
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318 jc := q.jobCreator(idj.kind) |
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|
319 if jc == nil { |
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|
320 errorAndFail(idj.id, "no creator for kind '%s' found", idj.kind) |
991
a301d240905f
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diff
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|
321 continue |
988
7dfd3db94e6d
In preparation of persisting import jobs logging is done through an interface.
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|
322 } |
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|
323 |
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324 // Lock dependencies. |
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325 q.creatorsMu.Lock() |
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326 for _, d := range jc.Depends() { |
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327 q.usedDeps[d] = struct{}{} |
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328 } |
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329 q.creatorsMu.Unlock() |
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330 |
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331 go func(jc JobCreator, idj *idJob) { |
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332 |
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333 // Unlock the dependencies. |
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334 defer func() { |
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335 q.creatorsMu.Lock() |
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336 for _, d := range jc.Depends() { |
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337 delete(q.usedDeps, d) |
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338 } |
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339 q.creatorsMu.Unlock() |
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340 select { |
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341 case q.signalChan <- struct{}{}: |
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342 default: |
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343 } |
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344 }() |
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345 |
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346 job, err := jc.Create(idj.kind, idj.data) |
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347 if err != nil { |
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348 errorAndFail(idj.id, "failed to create job for import #%d: %v", |
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349 idj.id, err) |
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350 return |
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351 } |
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352 |
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353 feedback := logFeedback(idj.id) |
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354 |
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355 feedback.Info("import #%d started", idj.id) |
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356 |
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357 errDo := survive(func() error { |
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358 return auth.RunAs(idj.user, context.Background(), |
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359 func(conn *sql.Conn) error { return job.Do(conn, feedback) }) |
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360 })() |
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361 if errDo != nil { |
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362 feedback.Error("error do: %v", errDo) |
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363 } |
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364 errCleanup := survive(job.CleanUp)() |
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365 if errCleanup != nil { |
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366 feedback.Error("error cleanup: %v", errCleanup) |
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367 } |
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368 |
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369 var state string |
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370 if errDo != nil || errCleanup != nil { |
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371 state = "failed" |
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372 } else { |
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373 state = "successful" |
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374 } |
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375 if err := updateState(idj.id, state); err != nil { |
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376 log.Printf("setting state of job %d failed: %v\n", idj.id, err) |
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377 } |
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378 log.Printf("import #%d finished: %s\n", idj.id, state) |
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379 }(jc, idj) |
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380 } |
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381 } |