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annotate pkg/controllers/shapestretches.go @ 4307:e5a831ecd557

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Started to write multi polygon into shape file. [WIP]
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 02 Sep 2019 18:38:27 +0200
parents 0f467a839fe2
children 2c83d32bdd1b
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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) 2019 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 controllers
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15
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16 import (
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17 "archive/zip"
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18 "database/sql"
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19 "fmt"
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20 "io"
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21 "io/ioutil"
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22 "log"
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23 "net/http"
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24 "os"
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25 "path/filepath"
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26 "time"
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27
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28 "github.com/gorilla/mux"
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29 "github.com/jonas-p/go-shp"
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30
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31 "gemma.intevation.de/gemma/pkg/config"
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32 "gemma.intevation.de/gemma/pkg/middleware"
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33 "gemma.intevation.de/gemma/pkg/wkb"
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34 )
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35
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36 const (
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37 selectStretchSQL = `
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38 SELECT
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39 id,
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40 isrs_asText(lower(stretch)),
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41 isrs_asText(upper(stretch)),
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42 ST_AsBinary(area::geometry),
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43 objnam,
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44 nobjnam,
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45 date_info,
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46 source_organization
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47 FROM waterway.stretches WHERE
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48 staging_done AND
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49 name = $1`
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50
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51 selectStretchCountriesSQL = `
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52 SELECT country_code FROM waterway.stretch_countries
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53 WHERE stretches_id = $1
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54 ORDER BY country_code`
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55 )
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56
4307
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57 func flattenPoints(mp wkb.MultiPolygonGeom) []shp.Point {
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58
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59 var n int
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60 for _, p := range mp {
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61 for _, r := range p {
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62 n += len(r)
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63 }
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64 }
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65
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66 ps := make([]shp.Point, n)
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67 var i int
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68 for _, p := range mp {
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69 for _, r := range p {
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70 for _, v := range r {
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71 ps[i].X = v.X
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72 ps[i].Y = v.Y
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73 i++
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74 }
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75 }
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76 }
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77
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78 log.Printf("info: total number points: %d\n", n)
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79
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80 return ps
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81 }
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82
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83 func asShpPolygon(mp wkb.MultiPolygonGeom) *shp.Polygon {
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84
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85 points := flattenPoints(mp)
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86
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87 p := &shp.Polygon{}
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88
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89 var numParts int
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90 for _, pl := range mp {
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91 numParts += len(pl)
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92 }
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93
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94 log.Printf("info: number parts: %d\n", numParts)
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95
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96 p.NumParts = int32(numParts)
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97 p.NumPoints = int32(len(points))
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98 p.Parts = make([]int32, numParts)
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99
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100 var marker int32
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101
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102 for i, pl := range mp {
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103 p.Parts[i] = marker
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104 marker += int32(len(pl))
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105 }
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106
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107 p.Points = points
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108 p.Box = shp.BBoxFromPoints(points)
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109 return p
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110 }
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111
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112 func stretchShapeDownload(rw http.ResponseWriter, req *http.Request) {
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113 vars := mux.Vars(req)
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114 name := vars["name"]
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115
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116 conn := middleware.GetDBConn(req)
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117 ctx := req.Context()
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118
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119 tx, err := conn.BeginTx(ctx, &sql.TxOptions{ReadOnly: true})
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120 if err != nil {
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121 http.Error(
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122 rw, fmt.Sprintf("DB error: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
125 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
126 defer tx.Rollback()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128 var (
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 id int64
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130 lower, upper string
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 data []byte
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132 objnam string
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 nobjnam sql.NullString
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 dateInfo time.Time
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 source string
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 )
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 switch err := tx.QueryRowContext(ctx, selectStretchSQL, name).Scan(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 &id,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 &lower, &upper,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 &data,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 &objnam, &nobjnam,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 &dateInfo,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 &source,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 ); {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 case err == sql.ErrNoRows:
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 http.NotFound(rw, req)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 case err != nil:
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 rw, fmt.Sprintf("DB error: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 var countries []string
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 if err := func() error {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159 rows, err := tx.Query(selectStretchCountriesSQL, id)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 defer rows.Close()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165 for rows.Next() {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 var country string
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 if err := rows.Scan(&country); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
169 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
170 countries = append(countries, country)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
173 return rows.Err()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
174 }(); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
175 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
176 rw, fmt.Sprintf("DB error: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
177 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
178 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
179 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
180
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
181 var geom wkb.MultiPolygonGeom
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
182
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
183 if err := geom.FromWKB(data); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
184 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
185 rw, fmt.Sprintf("Decoding WKB error: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
186 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
187 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
188 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
189
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
190 tmp := config.TmpDir()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
191
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
192 dir, err := ioutil.TempDir(tmp, "stretch-download")
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
193 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
194 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
195 rw, fmt.Sprintf("Cannot create temp dir: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
196 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
197 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
198 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
199 defer os.RemoveAll(dir)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
200
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
201 shpDir := filepath.Join(dir, "stretch")
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
202
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
203 if err := os.Mkdir(shpDir, os.ModePerm); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
204 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
205 rw, fmt.Sprintf("Cannot create temp dir: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
206 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
207 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
208 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
209
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
210 filename := filepath.Join(shpDir, "stretch")
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
211
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
212 if err := func() error {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
213 writer, err := shp.Create(filename, shp.POLYGON)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
215 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217 defer writer.Close()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
219 // TODO: Write geometry
4307
e5a831ecd557 Started to write multi polygon into shape file. [WIP]
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4305
diff changeset
220 p := asShpPolygon(geom)
e5a831ecd557 Started to write multi polygon into shape file. [WIP]
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4305
diff changeset
221
e5a831ecd557 Started to write multi polygon into shape file. [WIP]
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4305
diff changeset
222 writer.Write(p)
4305
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 return nil
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 }(); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227 rw, fmt.Sprintf("creating shapefile failed: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
229 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
230 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
231
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
232 entries, err := func() ([]os.FileInfo, error) {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
233 f, err := os.Open(shpDir)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
234 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
235 return nil, err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
236 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
237 defer f.Close()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
238 return f.Readdir(-1)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
239 }()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
240 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
241 http.Error(
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
242 rw, fmt.Sprintf("cannot read directory: %v.", err),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
243 http.StatusInternalServerError)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
244 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
245 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
246
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
247 rw.Header().Set("Content-Type", "application/zip")
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
248 rw.Header().Set("Content-Disposition", `attachment; filename="stretch.zip"`)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
249
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
250 zipfile := zip.NewWriter(rw)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
251 defer zipfile.Close()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
252
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
253 now := time.Now()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
254
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
255 base := filepath.Base(shpDir)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
256 for _, info := range entries {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
257 if !info.Mode().IsRegular() {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
258 continue
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
259 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
260 if err := func() error {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
261 srcFile, err := os.Open(filepath.Join(shpDir, info.Name()))
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
262 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
263 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
264 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
265 defer srcFile.Close()
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
266 header := &zip.FileHeader{
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
267 Name: base + "/" + info.Name(),
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
268 Method: zip.Deflate,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
269 Modified: now,
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
270 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
271 out, err := zipfile.CreateHeader(header)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
272 if err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
273 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
274 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
275 _, err = io.Copy(out, srcFile)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
276 return err
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
277 }(); err != nil {
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
278 log.Printf("error: cannot write file: %v\n", err)
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
279 return
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
280 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
281 }
0f467a839fe2 Moved stretches as shape file download to separate file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
282 }