Mercurial > gemma

annotate pkg/controllers/gauges.go @ 2694:0d7a4fdb9e12

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Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 15 Mar 2019 18:34:13 +0100
parents
children 87aed4f9b1b8
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rev   line source
2694
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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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 //
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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13
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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14 package controllers
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15
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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16 import (
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17 "encoding/csv"
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18 "fmt"
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19 "log"
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20 "net/http"
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21 "strconv"
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22 "time"
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23
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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24 "github.com/gorilla/mux"
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25
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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26 "gemma.intevation.de/gemma/pkg/middleware"
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27 "gemma.intevation.de/gemma/pkg/models"
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28 )
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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29
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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30 const (
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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31 selectWaterlevelsSQL = `
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32 SELECT
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33 measure_date,
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34 water_level,
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35 predicted
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36 FROM waterway.gauge_measurements
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37 WHERE
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38 `
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39 )
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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40
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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41 func waterlevels(rw http.ResponseWriter, req *http.Request) {
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42 gauge := mux.Vars(req)["gauge"]
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43
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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44 isrs, err := models.IsrsFromString(gauge)
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45 if err != nil {
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46 http.Error(
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47 rw, fmt.Sprintf("error: Invalid ISRS code: %v", err),
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48 http.StatusBadRequest)
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49 return
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50 }
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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51
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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52 var fb filterBuilder
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53 fb.stmt.WriteString(selectWaterlevelsSQL)
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54
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55 fb.cond(
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56 " fk_gauge_id = ($%d::char(2), $%d::char(3), $%d::char(5), $%d::char(5), $%d::int) ",
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57 isrs.CountryCode,
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58 isrs.LoCode,
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59 isrs.FairwaySection,
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60 isrs.Orc,
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61 isrs.Hectometre,
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62 )
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63
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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64 if from := req.FormValue("from"); from != "" {
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65 fromTime, err := time.Parse(models.ImportTimeFormat, from)
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66 if err != nil {
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67 http.Error(
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68 rw, fmt.Sprintf("error: Invalid from time: %v", err),
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69 http.StatusBadRequest)
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70 return
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71 }
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72 fb.cond("measure_date >= $%d", fromTime)
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73 }
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74
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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75 if to := req.FormValue("to"); to != "" {
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76 toTime, err := time.Parse(models.ImportTimeFormat, to)
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77 if err != nil {
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78 http.Error(
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79 rw, fmt.Sprintf("error: Invalid from time: %v", err),
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80 http.StatusBadRequest)
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81 return
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82 }
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83 fb.cond("measure_date <= $%d", toTime)
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84 }
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85
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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86 conn := middleware.GetDBConn(req)
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87
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88 ctx := req.Context()
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89
0d7a4fdb9e12 Added GET /api/data/waterlevels/{gauge isrs}?from={time_a}&to={time_b} to fetch waterlevels of gauge.
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90 rows, err := conn.QueryContext(ctx, fb.stmt.String(), fb.args...)
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91 if err != nil {
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92 http.Error(
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93 rw, fmt.Sprintf("error: %v", err),
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94 http.StatusInternalServerError)
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95 return
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96 }
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97 defer rows.Close()
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98
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99 rw.Header().Add("Content-Type", "text/csv")
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100
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101 out := csv.NewWriter(rw)
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102
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103 record := make([]string, 3)
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104
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105 for rows.Next() {
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106 var (
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107 measureDate time.Time
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108 waterlevel float64
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109 predicted bool
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110 )
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111 if err := rows.Scan(&measureDate, &waterlevel, &predicted); err != nil {
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112 log.Printf("error: %v\n", err)
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113 // Too late for an HTTP error code.
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114 return
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115 }
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116 record[0] = measureDate.Format(models.ImportTimeFormat)
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117 record[1] = strconv.FormatFloat(waterlevel, 'f', -1, 64)
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118 if predicted {
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119 record[2] = "t"
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120 } else {
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121 record[2] = "f"
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122 }
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123 if err := out.Write(record); err != nil {
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124 log.Printf("error: %v", err)
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125 // Too late for an HTTP error code.
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126 return
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127 }
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128 }
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129
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130 if err := rows.Err(); err != nil {
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131 log.Printf("error: %v", err)
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132 // Too late for an HTTP error code.
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parents:
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133 return
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134 }
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135
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136 out.Flush()
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137 if err := out.Error(); err != nil {
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parents:
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138 log.Printf("error: %v", err)
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parents:
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139 // Too late for an HTTP error code.
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parents:
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140 return
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parents:
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141 }
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142 }