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map.go
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map.go
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package maps
import (
"net/http"
"strconv"
"github.com/go-chi/chi"
"github.com/gobuffalo/packr"
"github.com/jinzhu/gorm"
jsoniter "github.com/json-iterator/go"
"github.com/matematik7/camino-go/diary/models"
"github.com/matematik7/gongo"
"github.com/matematik7/gongo/files"
"github.com/matematik7/gongo/render"
"github.com/spf13/viper"
)
type Maps struct {
DB *gorm.DB
Files *files.Files
render *render.Render
}
func New() *Maps {
return &Maps{}
}
func (c *Maps) Configure(app gongo.App) error {
c.DB = app["DB"].(*gorm.DB)
c.render = app["Render"].(*render.Render)
c.Files = app["Files"].(*files.Files)
c.render.AddTemplates(packr.NewBox("./templates"))
return nil
}
func (c Maps) Resources() []interface{} {
return []interface{}{
&models.MapEntry{},
&models.MapGroup{},
&models.GpsData{},
}
}
func (c *Maps) ServeMux() http.Handler {
router := chi.NewRouter()
router.Get("/", c.ViewHandler)
router.Get("/group/{groupID:[0-9]+}", c.GroupJSONHandler)
return router
}
func (c *Maps) ViewHandler(w http.ResponseWriter, r *http.Request) {
var groups []models.MapGroup
subQuery := c.DB.Select("distinct map_group_id").Table("map_entries").SubQuery()
query := c.DB.Order("id desc").Where("id IN (?)", subQuery).Find(&groups)
if err := query.Error; err != nil {
c.render.Error(w, r, err)
return
}
context := render.Context{
"groups": groups,
"browser_key": viper.GetString("GMAP_BROWSER_KEY"),
}
c.render.Template(w, r, "map.html", context)
}
type MapEntryJSON struct {
ID uint `json:"id"`
Title string `json:"title"`
Description string `json:"description,omitempty"`
Lat float64 `json:"latitude"`
Lon float64 `json:"longitude"`
GpsDataID uint `json:"gps_id"`
DiaryEntry *DiaryEntryJSON `json:"diary,omitempty"`
}
type DiaryEntryJSON struct {
ID uint `json:"id"`
Title string `json:"title"`
Image *ImageJSON `json:"image,omitempty"`
}
type ImageJSON struct {
Description string `json:"description"`
URL string `json:"url"`
}
func (c *Maps) GroupJSONHandler(w http.ResponseWriter, r *http.Request) {
id, err := strconv.Atoi(chi.URLParam(r, "groupID"))
if err != nil {
c.render.NotFound(w, r)
return
}
var entries []models.MapEntry
result := c.DB.Preload("DiaryEntry.Images", func(db *gorm.DB) *gorm.DB {
return db.Order("diary_entry_id, RANDOM()").Select("distinct on (diary_entry_id) *")
}).
Where("map_group_id = ?", id).Order("id desc").Find(&entries)
if err := result.Error; err != nil {
c.render.Error(w, r, err)
return
}
var gpsData models.GpsData
gpsRows, err := c.DB.Model(&gpsData).Joins("JOIN map_entries ON map_entries.gps_data_id = gps_data.id").Where("map_entries.map_group_id = ?", id).Rows()
if err != nil {
c.render.Error(w, r, err)
return
}
w.Header().Set("Content-Type", "application/json")
stream := jsoniter.ConfigFastest.BorrowStream(w)
defer jsoniter.ConfigFastest.ReturnStream(stream)
stream.WriteObjectStart()
stream.WriteObjectField("entries")
stream.WriteArrayStart()
for i, entry := range entries {
if i != 0 {
stream.WriteMore()
}
jsonEntry := MapEntryJSON{
ID: entry.ID,
Title: entry.City,
Description: entry.Description,
Lat: entry.Lat,
Lon: entry.Lon,
GpsDataID: entry.GpsDataID,
}
if entry.DiaryEntry != nil {
jsonEntry.DiaryEntry = &DiaryEntryJSON{
ID: entry.DiaryEntry.ID,
Title: entry.DiaryEntry.Title,
}
if len(entry.DiaryEntry.Images) > 0 {
url, err := c.Files.URL(entry.DiaryEntry.Images[0])
if err != nil {
c.render.Error(w, r, err)
return
}
jsonEntry.DiaryEntry.Image = &ImageJSON{
Description: entry.DiaryEntry.Images[0].Description,
URL: url,
}
}
}
stream.WriteVal(jsonEntry)
}
stream.WriteArrayEnd()
stream.WriteMore()
stream.WriteObjectField("gps")
stream.WriteObjectStart()
first := true
for gpsRows.Next() {
err := c.DB.ScanRows(gpsRows, &gpsData)
if err != nil {
c.render.Error(w, r, err)
return
}
optimizedData, err := gpsData.OptimizedData()
if err != nil {
c.render.Error(w, r, err)
return
}
if !first {
stream.WriteMore()
}
stream.WriteObjectField(strconv.Itoa(int(gpsData.ID)))
stream.WriteRaw(optimizedData)
first = false
}
if err := gpsRows.Err(); err != nil {
c.render.Error(w, r, err)
return
}
stream.WriteObjectEnd()
stream.WriteObjectEnd()
stream.Flush()
}