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annotate pkg/imports/misc.go @ 4178:51e90370eced

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A few more doc strings to make 'golint' a little bit more happy with the imports package.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 05 Aug 2019 17:45:03 +0200
parents f464cbcdf2f2
children 1d50ac8dd688
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1 // SPDX-License-Identifier: AGPL-3.0-or-later
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2 // License-Filename: LICENSES/AGPL-3.0.txt
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3 //
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4 // Copyright (C) 2018 by via donau
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5 // – Österreichische Wasserstraßen-Gesellschaft mbH
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6 // Software engineering by Intevation GmbH
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7 //
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8 // Author(s):
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9 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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10
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11 package imports
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12
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13 import (
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14 "context"
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15 "database/sql"
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16 "fmt"
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17 "strings"
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18 )
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19
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20 type stringCounter map[string]int
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21
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22 func (sc stringCounter) String() string {
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23 var b strings.Builder
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24 for t, c := range sc {
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25 if b.Len() > 0 {
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26 b.WriteString(", ")
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27 }
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28 b.WriteString(fmt.Sprintf("%s: %d", t, c))
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29 }
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30 return b.String()
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31 }
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32
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33 // Savepoint is a function wrapper to hide the details
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34 // of managing database SAVEPOINTs.
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35 // If the returned function is called with a callback
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36 // the callback is run in a SAVEPOINT.
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37 // If the callback returns w/o an error the SAVEPOINT
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38 // is released. Otherwise the SAVEPOINT is rolled back.
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39 func Savepoint(
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40 ctx context.Context,
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41 tx *sql.Tx,
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42 name string,
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43 ) func(func() error) error {
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44
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45 var (
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46 savepoint = "SAVEPOINT " + name
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47 rollback = "ROLLBACK TO SAVEPOINT " + name
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48 release = "RELEASE SAVEPOINT " + name
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49 )
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50
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51 return func(fn func() error) (err error) {
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52 if _, err = tx.ExecContext(ctx, savepoint); err != nil {
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53 return
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54 }
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55 var done bool
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56 defer func() {
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57 if !done {
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58 _, err2 := tx.ExecContext(ctx, rollback)
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59 if err == nil {
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60 err = err2
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61 }
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62 }
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63 }()
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64 if err = fn(); err == nil {
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65 done = true
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66 _, err = tx.ExecContext(ctx, release)
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67 }
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68 return
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69 }
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70 }