geotile_sdk/test/routes/tile.js

A tile sdk for Cloud Optimised Geotiff and shapefile

/*
 * @Description:
 * @Author: luojun1
 * @Date: 2021-10-21 17:25:12
 * @LastEditTime: 2021-12-15 15:36:20
 */
var fs = require('fs')
var path = require('path')
var geotileSDK = require('../../src')

module.exports = async (req, res) => {
  // fs.appendFile(__dirname + '/url.txt', 'curl -X GET  "http://localhost:5000' + req.path + '?&OP=0"\n', function () {
  // })
  // fs.appendFile(__dirname + '/urlOP.txt', 'curl -X GET  "http://localhost:5000' + req.path + '"\n', function () {
  // })

  // 返回结果
  var start = new Date().getTime()

  const OP = req.query.OP ? req.query.OP : 0
  const CachePath = req.query.Cache ? req.query.Cache : ''
  const format = req.path.split('?')[0].substring(req.path.split('?')[0].lastIndexOf('.') + 1)
  console.log('#####format:  ', format)
  if (OP === 1 && format === 'png') {
    geotileSDK.fetchTileOptimized(req.params.x, req.params.y, req.params.z, req.params.id, (err, buffer) => {
      // res.contentType('image/png')
      if (err) {
        res.send(buffer)
        console.log('#####error：', err)
      } else {
        res.send(buffer)
        // var processTime = new Date().getTime()
        // console.log('###fetchTileOptimized Time:', processTime - start)
      }
    })
  } else {
    geotileSDK.fetchTile(req.params.x, req.params.y, req.params.z, req.params.id, format, (err, buffer) => {
      if (format === 'png') {
        res.contentType('image/png')
      } else {
        // res.contentType('mapbox')
        res.setHeader('Content-Encoding', 'deflate')
        res.setHeader('Content-Type', 'application/x-protobuf')
      }

      if (err) {
        res.send(buffer)
        console.log('#####error：', err)
      } else {
        res.send(buffer)
        var processTime = new Date().getTime()
        console.log('###fetchTile Time,', processTime - start)

        // disk cache
        if (CachePath !== '') {
          let dir = path.join(CachePath, req.params.id, req.params.z, req.params.x)
          mkdirs(dir, () => {
            fs.writeFile(path.join(CachePath, req.params.id, req.params.z, req.params.x, req.params.y + '.' + format), buffer, () => {})
          })
        }
      }
    })
  }
}

// 递归创建目录 异步方法
function mkdirs (dirname, callback) {
  fs.access(dirname, fs.constants.F_OK, (err) => {
    if (err) {
      mkdirs(path.dirname(dirname), function () {
        fs.mkdir(dirname, callback)
      })
    } else {
      callback()
    }
  })
}