├── config_demo
    └── esri.json
├── src
    ├── util
    │   ├── create_dir.js
    │   ├── progressbar
    │   │   ├── format.js
    │   │   └── index.js
    │   ├── xyz.js
    │   ├── getTileUrl.js
    │   ├── userAgent.js
    │   └── freetile_status.js
    └── app.js
├── bin
    └── freetile.js
├── package.json
├── README.md
├── .gitignore
└── LICENSE


/config_demo/esri.json:
--------------------------------------------------------------------------------
1 | {
2 |     "bound":[118,32,119,33],
3 |     "levels":[1,2,3,4,5,6,7,8,9,10,11,12,13,14],
4 |     "parallel":50,
5 |     "downPath":"c://esritiles",
6 |     "tileformat":"png",
7 |     "mapurl":"http://cache1.arcgisonline.cn/arcgis/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}"
8 | }


--------------------------------------------------------------------------------
/src/util/create_dir.js:
--------------------------------------------------------------------------------
 1 | var fs=require('fs');
 2 | var path=require('path');
 3 | //根据文件，同步递归创建其上一级目录
 4 | function createDirs(file) {
 5 | 	//获取文件根目录
 6 | 	let dirpath=path.dirname(file);
 7 | 	//有路径直接回调走
 8 | 	if(fs.existsSync(dirpath)){
 9 |         return true;
10 |     }else{
11 |         if(createDirs(dirpath)){
12 |             fs.mkdirSync(dirpath);
13 |             return true;
14 |         }
15 |     }
16 | };
17 | module.exports=createDirs;


--------------------------------------------------------------------------------
/bin/freetile.js:
--------------------------------------------------------------------------------
 1 | #!/usr/bin/env node
 2 | const { program } = require('commander');
 3 | const run = require("../src/app");
 4 | //定义命令行帮助命令
 5 | program.option('-f, --config_file <String>', '底图下载配置文件');
 6 | //解析命令行参数
 7 | program.parse(process.argv);
 8 | console.log(process.argv);
 9 | console.log(program);
10 | 
11 | const options = program.opts();
12 | 
13 | //检查参数
14 | if (!options.config_file) {
15 |   console.log('底图下载配置文件config_file路径必填！');
16 |   process.exit();
17 | }
18 | const config=require(options.config_file);
19 | run(config);
20 | 
21 | 
22 | 
23 | process.on('uncaughtException', function (err) {
24 |   //打印出错误
25 |   console.log(err);
26 |   //打印出错误的调用栈方便调试
27 |   console.log(err.stack);
28 |  });
29 | //process全局对象
30 | process.on('SIGINT', function (e) {
31 |   console.log(e);
32 |   process.exit();
33 | });


--------------------------------------------------------------------------------
/src/util/progressbar/format.js:
--------------------------------------------------------------------------------
 1 | function format(str, params = []) {
 2 |     var pattern = /{([\s\S])*?}/gim;
 3 |     var index = 0;
 4 |     var params_index = 0;
 5 |     return str.replace(pattern, (match, tuple, offset) => {
 6 |         index = offset + match.length;
 7 |         params_index += 1;
 8 | 
 9 |         // 异常格式处理，对于列表和对象类型的param，对外抛出异常
10 |         if (typeof params[params_index - 1] == [] || typeof params[params_index - 1] == {}) {
11 |             throw TypeError(params[params_index - 1] + "不能为对象类型！");
12 |         }
13 | 
14 |         if (match.length > 2) {
15 |             match = match.slice(1, match.length - 1);
16 |             return eval('params[params_index-1].' + match);;
17 |         } else {
18 |             return params[params_index - 1];
19 |         }
20 |     });
21 | }
22 | 
23 | module.exports=format;


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "map-tile-downloader",
 3 |   "version": "1.1.0",
 4 |   "description": "下载公网地图服务器中以xyz及其形变性质的地图切片，用于离线GIS系统建设使用",
 5 |   "bin": {
 6 |     "freetile": "bin/freetile.js"
 7 |   },
 8 |   "scripts": {
 9 |     "test": "echo \"Error: no test specified\" && exit 1"
10 |   },
11 |   "repository": {
12 |     "type": "git",
13 |     "url": "git+https://github.com/FreeGIS/map-tile-downloader.git"
14 |   },
15 |   "author": "",
16 |   "license": "ISC",
17 |   "bugs": {
18 |     "url": "https://github.com/FreeGIS/map-tile-downloader/issues"
19 |   },
20 |   "homepage": "https://github.com/FreeGIS/map-tile-downloader#readme",
21 |   "dependencies": {
22 |     "cli-color": "^2.0.0",
23 |     "commander": "^14.0.0",
24 |     "proj4": "^2.9.0",
25 |     "single-line-log": "^1.1.2",
26 |     "superagent": "^10.2.3"
27 |   }
28 | }
29 | 


--------------------------------------------------------------------------------
/src/util/xyz.js:
--------------------------------------------------------------------------------
 1 | const bbox = {
 2 |   xmin: -20037508.342789244,
 3 |   ymin: -20037508.342789244,
 4 |   xmax: 20037508.342789244,
 5 |   ymax: 20037508.342789244
 6 | }
 7 | 
 8 | function getTileByCoors(coor, zoom) {
 9 |   // 计算coor与bbox左上角坐标
10 |   const left = bbox.xmin;
11 |   const top = bbox.ymax;
12 |   const _width = coor[0] - left;
13 |   const _height = top - coor[1];
14 |   let worldTileSize = 0x01 << zoom;
15 |   const boundsWidth = bbox.xmax - bbox.xmin;
16 |   const boundsHeight = bbox.ymax - bbox.ymin;
17 |   const tileGeoSize = Math.max(boundsWidth, boundsHeight) * 1.0 / worldTileSize;
18 |   const row = Math.floor(_height / tileGeoSize);
19 |   const column = Math.floor(_width / tileGeoSize);
20 | 
21 |   return {
22 |     row, column
23 |   }
24 | }
25 | 
26 | 
27 | function bound2xyzs(bound, tz) {
28 |   // 使用左上角，右下角，计算瓦片行列号
29 |   const tileinfo1 = getTileByCoors([bound[0], bound[3]], tz);
30 |   const tileinfo2 = getTileByCoors([bound[2], bound[1]], tz);
31 |   // 部分瓦片规则是从下往上，综合判断即可
32 |   const xyz1 = [tileinfo1.column, Math.min(tileinfo1.row, tileinfo2.row), tz];
33 |   const xyz2 = [tileinfo2.column, Math.max(tileinfo1.row, tileinfo2.row), tz];
34 |   return [xyz1, xyz2];
35 | }
36 | 
37 | 
38 | module.exports = { bound2xyzs };


--------------------------------------------------------------------------------
/src/util/getTileUrl.js:
--------------------------------------------------------------------------------
 1 |  const zRegEx = /\{z\}/g;
 2 |  const xRegEx = /\{x\}/g;
 3 |  const yRegEx = /\{y\}/g;
 4 |   
 5 |  function getTileUrl(template,xyz){
 6 | 	//console.log(template,xyz);
 7 | 	 let match = /\{([a-z])-([a-z])\}/.exec(template);
 8 | 	 if (match) {
 9 | 		const startCharCode = match[1].charCodeAt(0);
10 | 		const stopCharCode = match[2].charCodeAt(0);
11 | 		let charCode=String.fromCharCode(getRandomServiceId(startCharCode,stopCharCode));
12 | 		template=template.replace(match[0], charCode);
13 | 	 } else {
14 | 		match = match = /\{(\d+)-(\d+)\}/.exec(template);
15 | 		if (match) {
16 | 		   const start = parseInt(match[1], 10);
17 | 		   const stop = parseInt(match[2], 10);
18 | 		   let charCode=getRandomServiceId(start,stop);
19 | 		   template=template.replace(match[0], charCode.toString());
20 | 	   }
21 | 	 }
22 | 	let url=template.replace(zRegEx, xyz[0].toString())
23 | 	.replace(xRegEx, xyz[1].toString())
24 | 	.replace(yRegEx, xyz[2].toString());
25 | 	return url;
26 |   }
27 |   
28 |   //获取随机的地图服务器代号，从而减少对爬取服务器的压力
29 |  function getRandomServiceId(startcode,endcode){
30 | 	let strcode=startcode+Math.round(Math.random()*(endcode-startcode));
31 | 	return strcode;
32 |  }
33 |  //获取随机token
34 |  function getRandomToken(tokens){
35 | 	const token_length=tokens.length;
36 | 	let _index=Math.round(Math.random()*(token_length-1));
37 | 	return tokens[_index];
38 | }
39 | module.exports = {getTileUrl,getRandomToken};


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Map-Tile-DownLoader
 2 | ## 一 作用
 3 | 
 4 | 下载公网地图服务器中以xyz及其类xyz形式的地图切片，用于离线GIS系统底图使用。该xyz形式为基于墨卡托投影的坐标系，切片大小为256*256规格。
 5 | 
 6 | ## 二 限制
 7 | 
 8 | 1. xyz切片原点是基于左上角，大部分切片符合这个规则，百度切片原点在中心点，不符合。
 9 | 2. xyz切片大小为标准的256 * 256，大部分切片大小符合这个规则，类似cesium地形大小为64 * 64不符合。
10 | 
11 | ## 三 支持范围
12 | 
13 | 1 支持esri公网这种不需要带token的切片下载。
14 | 
15 | 2 支持天地图，mapbox这种带token的切片下载，由于这类服务器对单token的请求数量和请求规则做了爬虫限制，需自备一个token列表，绕开数量限制和请求行为限制。
16 | 
17 | 3 大部分明显为墨卡托的xyz格式的切片都可以下载。
18 | 
19 | ## 四 使用说明
20 | 
21 | ### 4.1 安装
22 | 
23 | 源码形式：
24 | 
25 | ```shell
26 | git clone git@github.com:FreeGIS/map-tile-downloader.git
27 | cd map-tile-downloader
28 | npm install
29 | npm link
30 | ```
31 | 
32 | npm安装命令行形式：
33 | 
34 | ```
35 | npm i map-tile-downloader -g
36 | ```
37 | 
38 | 验证安装：
39 | 
40 | ```
41 | freetile -h
42 | Usage: freetile [options]
43 | 
44 | Options:
45 |   -f, --config_file <String>  底图下载配置文件
46 |   -h, --help                  display help for command
47 | ```
48 | 
49 | ### 4.2 下载配置
50 | 
51 | 工程目录config下有若干下载模板，配置参数说明如下：
52 | 
53 | bound：下载切片的wgs84坐标系的地理范围。
54 | 
55 | levels：下载切片的级别数组。
56 | 
57 | parallel：下载请求的并发数。
58 | 
59 | mapurl：下载切片服务xyz模板。
60 | 
61 | tileformat：明确指定下载切片的格式，如png jpeg pbf webp等。
62 | 
63 | downPath：下载切片本地存储目录。
64 | 
65 | tokenInfo：可选，对需要指定token的服务在此设置，该设置有三个选项。
66 | 
67 | ​			location:token位置，枚举型，枚举值为"url"与"headers"。该设置用于明确指定token是在url里申明还是 headers里申明，这需要根据具体服务明确。例如：天地图和mapbox都是url中加token，而cesium地形却是在headers里申明。
68 | 
69 | ​			key：token值绑定的主键，例如天地图是xxxx?tk=xxxxx，那么key就配置为"tk"。
70 | 
71 | ​			values：token值数组，多配置几个，用于随机获取token下载，避免请求数量和行为限制。
72 | 
73 | ### 4.3 切片下载
74 | 
75 | ```
76 | freetile -f D:/xxx/xx/esri.json
77 | ```
78 | 
79 | 
80 | 
81 | 


--------------------------------------------------------------------------------
/src/util/userAgent.js:
--------------------------------------------------------------------------------
 1 | let hds=[
 2 |     {'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'},
 3 |     {'User-Agent':'Mozilla/5.0 (Windows NT 6.2) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.12 Safari/535.11'},
 4 |     {'User-Agent':'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)'},
 5 |     {'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:34.0) Gecko/20100101 Firefox/34.0'},
 6 |     {'User-Agent':'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/44.0.2403.89 Chrome/44.0.2403.89 Safari/537.36'},
 7 |     {'User-Agent':'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_8; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50'},
 8 |     {'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50'},
 9 |     {'User-Agent':'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0'},
10 |     {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1'},
11 |     {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1'},
12 |     {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11'},
13 |     {'User-Agent':'Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11'},
14 |     {'User-Agent':'Opera/9.80 (Windows NT 6.1; U; en) Presto/2.8.131 Version/11.11'}
15 | ];
16 | 
17 | const hdsLength=hds.length;
18 | 
19 | function getRandomUserAgent(){
20 | 	let _index=Math.round(Math.random()*(hdsLength-1));
21 | 	return hds[_index];
22 | }
23 | 
24 | module.exports = getRandomUserAgent;


--------------------------------------------------------------------------------
/src/util/progressbar/index.js:
--------------------------------------------------------------------------------
 1 | /**
 2 |  * 进度条实现。
 3 |  */
 4 | //const log = require('./log');
 5 | var log = require('single-line-log').stdout;
 6 | const format = require('./format');
 7 | const clicolor = require('cli-color');
 8 | /**
 9 |  * 封装一个进度条工具。
10 |  */
11 | function ProgressBar(description, bar_length) {
12 |     this.description = description || "PROGRESS";
13 |     this.length = bar_length.length || 28;
14 | 
15 |     // 刷新进度条图案，文字的方法
16 |     this.render = function(opts) {
17 |         var percentage = (opts.completed/opts.total).toFixed(4);
18 |         var cell_num = Math.floor(percentage * this.length);
19 |         // 拼接黑色条
20 |         var cell = '';
21 |         for(var i = 0; i < cell_num; i++) {
22 |             cell += '█';
23 |         }
24 |         // 拼接灰色条
25 |         var empty = '';
26 |         for(var i = 0; i < this.length - cell_num; i++) {
27 |             empty += '░';
28 |         }
29 |         
30 |         var percent = (100*percentage).toFixed(2);
31 |         /**
32 |          * 使用cli-color进行包装美化。
33 |          */
34 |         this.description = clicolor.blue.bold(this.description);
35 |         cell = clicolor.green.bgBlack.bold(cell);
36 |         opts.completed = clicolor.yellow.bold(opts.completed);
37 |         opts.failed = clicolor.red.bold(opts.failed);
38 |         
39 | 
40 |         opts.total = clicolor.blue.bold(opts.total);
41 |         opts.status = percent==100.00?clicolor.green.bold(opts.status):clicolor.red.bold(opts.status);
42 | 
43 | 
44 |         // 拼接最终文本
45 |         var cmdtext = format("<{}:{}%> {}{}  [ {}/{} 失败切片数量：{} {}]", [this.description, percent,
46 |         cell, empty, opts.completed, opts.total, opts.failed, opts.status]);
47 |         log(cmdtext);
48 |     };
49 | }
50 | 
51 | 
52 | /**
53 |  * 模块导出。
54 |  */
55 | module.exports = ProgressBar;


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
  1 | # Logs
  2 | logs
  3 | *.log
  4 | npm-debug.log*
  5 | yarn-debug.log*
  6 | yarn-error.log*
  7 | lerna-debug.log*
  8 | my/
  9 | # Diagnostic reports (https://nodejs.org/api/report.html)
 10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
 11 | 
 12 | # Runtime data
 13 | pids
 14 | *.pid
 15 | *.seed
 16 | *.pid.lock
 17 | 
 18 | # Directory for instrumented libs generated by jscoverage/JSCover
 19 | lib-cov
 20 | 
 21 | # Coverage directory used by tools like istanbul
 22 | coverage
 23 | *.lcov
 24 | 
 25 | # nyc test coverage
 26 | .nyc_output
 27 | 
 28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
 29 | .grunt
 30 | 
 31 | # Bower dependency directory (https://bower.io/)
 32 | bower_components
 33 | 
 34 | # node-waf configuration
 35 | .lock-wscript
 36 | 
 37 | # Compiled binary addons (https://nodejs.org/api/addons.html)
 38 | build/Release
 39 | 
 40 | # Dependency directories
 41 | node_modules/
 42 | jspm_packages/
 43 | 
 44 | # TypeScript v1 declaration files
 45 | typings/
 46 | 
 47 | # TypeScript cache
 48 | *.tsbuildinfo
 49 | 
 50 | # Optional npm cache directory
 51 | .npm
 52 | 
 53 | # Optional eslint cache
 54 | .eslintcache
 55 | 
 56 | # Microbundle cache
 57 | .rpt2_cache/
 58 | .rts2_cache_cjs/
 59 | .rts2_cache_es/
 60 | .rts2_cache_umd/
 61 | 
 62 | # Optional REPL history
 63 | .node_repl_history
 64 | 
 65 | # Output of 'npm pack'
 66 | *.tgz
 67 | 
 68 | # Yarn Integrity file
 69 | .yarn-integrity
 70 | 
 71 | # dotenv environment variables file
 72 | .env
 73 | .env.test
 74 | 
 75 | # parcel-bundler cache (https://parceljs.org/)
 76 | .cache
 77 | 
 78 | # Next.js build output
 79 | .next
 80 | 
 81 | # Nuxt.js build / generate output
 82 | .nuxt
 83 | dist
 84 | 
 85 | # Gatsby files
 86 | .cache/
 87 | # Comment in the public line in if your project uses Gatsby and *not* Next.js
 88 | # https://nextjs.org/blog/next-9-1#public-directory-support
 89 | # public
 90 | 
 91 | # vuepress build output
 92 | .vuepress/dist
 93 | 
 94 | # Serverless directories
 95 | .serverless/
 96 | 
 97 | # FuseBox cache
 98 | .fusebox/
 99 | 
100 | # DynamoDB Local files
101 | .dynamodb/
102 | 
103 | # TernJS port file
104 | .tern-port
105 | 
106 | config/
107 | 


--------------------------------------------------------------------------------
/src/util/freetile_status.js:
--------------------------------------------------------------------------------
 1 | var ProgressBar = require('./progressbar/index');
 2 | 
 3 | function FreeTile_Status(xyzCount){
 4 |     this.sucessCount=0;//成功总数
 5 |     this.errorTiles={};//错误切片明细
 6 |     this.errorCount=0;
 7 |     this.tileCount=xyzCount;//切片任务总数
 8 |     this.currentIndex=0;
 9 |     this.pb=new ProgressBar('下载进度', 100);
10 | }
11 | 
12 | //设置切片任务总数
13 | FreeTile_Status.prototype.setTileCount=function(xyzCount){
14 |     this.tileCount=xyzCount;
15 | }
16 | //得到错误切片总数
17 | FreeTile_Status.prototype.getErrorTileCount=function(){
18 |     return Object.keys(this.errorTiles).length;
19 | }
20 | //得到错误切片的数组
21 | FreeTile_Status.prototype.getErrorTiles=function(){
22 |     let errotTiles=[];
23 |     let self=this;
24 |     Object.keys(this.errorTiles).forEach(function(key) {
25 |         errotTiles.push(self.errorTiles[key].tile);
26 |     });
27 |     return errotTiles;
28 | }
29 | 
30 | //新增一个 错误切片
31 | FreeTile_Status.prototype.addErrorTile=function(xyz){
32 |     let id=xyz.join("-");
33 |     //只有不存在该tile，加入统计
34 |     if(!this.errorTiles[id])
35 |     {
36 |         this.errorTiles[id]={
37 |             tile:xyz,
38 |             err_num:1
39 |         };
40 |         this.errorCount++;
41 |     }
42 |     //错误集合已存在该tile，则计数，累计5次，判定是废弃切片请求，直接移除
43 |     else{
44 |         this.errorTiles[id].err_num++;
45 |         if(this.errorTiles[id].err_num==5){
46 |             delete this.errorTiles[id];
47 |             this.currentIndex++;
48 |         }
49 |     }
50 |     this.showStatus();
51 | }
52 | 
53 | //正确处理的切片
54 | FreeTile_Status.prototype.addSuccessTile=function(xyz){
55 |     const id=xyz.join("-");
56 |     delete this.errorTiles[id];
57 |     //成功总数加1
58 |     this.sucessCount++;
59 |     this.currentIndex++;
60 |     this.showStatus();
61 | }
62 | 
63 | 
64 | 
65 | FreeTile_Status.prototype.showStatus=function(){
66 |     if(this.currentIndex<this.tileCount){
67 |         this.pb.render({ completed: this.currentIndex,failed:this.errorCount, total: this.tileCount, status: '下载中...' });
68 |     }
69 |     else{
70 |         this.pb.render({ completed: this.currentIndex,failed:this.errorCount, total: this.tileCount, status: '下载完毕.' });
71 |     }
72 | }
73 | 
74 | module.exports = FreeTile_Status;


--------------------------------------------------------------------------------
/src/app.js:
--------------------------------------------------------------------------------
  1 | const fs = require("fs");
  2 | const path = require("path");
  3 | const superagent = require('superagent');
  4 | const { getTileUrl, getRandomToken } = require('./util/getTileUrl');
  5 | const FreeTile_Status = require('./util/freetile_status');
  6 | const createDirs = require('./util/create_dir');
  7 | const { bound2xyzs } = require('./util/xyz');
  8 | const getRandomUserAgent = require('./util/userAgent');
  9 | const proj4 = require('proj4');
 10 | 
 11 | //config设置为全局变量
 12 | let TileConfig;
 13 | //下载状态提示
 14 | let freetile_status = new FreeTile_Status();
 15 | 
 16 | function run(config) {
 17 |     TileConfig = config;
 18 |     //获取下载地理范围
 19 |     const bound = TileConfig.bound;
 20 |     //获取下载级别
 21 |     const levels = TileConfig.levels;
 22 |     //根据地理范围和级别，获取下载的xyz区间
 23 |     const xyzMetedata = getXYZMetedata(bound, levels);
 24 | 
 25 |     //设置进度提示总数
 26 |     freetile_status.setTileCount(xyzMetedata.tileCount);
 27 |     //获取下载列表
 28 |     const xyzs = xyzMetedata.xyzs;
 29 |     //执行下载任务，同步方法仅仅内部同步，外部仍然跳下一行执行
 30 |     tileTask(xyzs);
 31 | }
 32 | 
 33 | //切片下载元数据
 34 | function getXYZMetedata(bound, levels) {
 35 |     const mktbound1 = proj4('EPSG:4326', 'EPSG:3857', [bound[0], bound[1]]);
 36 |     const mktbound2 = proj4('EPSG:4326', 'EPSG:3857', [bound[2], bound[3]]);
 37 |     const mktbound = [mktbound1[0], mktbound1[1], mktbound2[0], mktbound2[1]];
 38 |     let xyzMetedata = {
 39 |         tileCount: 0,
 40 |         xyzs: {}
 41 |     };
 42 |     for (let i = 0; i < levels.length; i++) {
 43 |         const xyzs = bound2xyzs(mktbound, levels[i]);
 44 |         //行列号之差做乘
 45 |         xyzMetedata.tileCount += (xyzs[1][0] - xyzs[0][0] + 1) * (xyzs[1][1] - xyzs[0][1] + 1);
 46 |         xyzMetedata.xyzs[levels[i]] = xyzs;
 47 |     }
 48 |     return xyzMetedata;
 49 | }
 50 | 
 51 | //切片下载任务
 52 | async function tileTask(xyz_obj) {
 53 |     let promises = [];
 54 |     for (let key in xyz_obj) {
 55 |         const z = parseInt(key);
 56 |         const min_col = xyz_obj[key][0][0];
 57 |         const max_col = xyz_obj[key][1][0];
 58 |         const min_row = xyz_obj[key][0][1];
 59 |         const max_row = xyz_obj[key][1][1];
 60 |         for (let row = min_row; row <= max_row; row++) {
 61 |             for (let col = min_col; col <= max_col; col++) {
 62 |                 promises.push(getTile2Disk([z, col, row]));
 63 |                 //根据访问并发设置，并发请求
 64 |                 if (promises.length == TileConfig.parallel) {
 65 |                     await Promise.all(promises);
 66 |                     promises = [];
 67 |                 }
 68 |             }
 69 |         }
 70 |     }
 71 |     if (promises.length > 0) {
 72 |         await Promise.all(promises);
 73 |         promises = [];
 74 |     }
 75 |     //执行错误补充下载
 76 |     errorTileTask();
 77 | }
 78 | 
 79 | async function errorTileTask() {
 80 |     //如果错误切片数量为0，结束递归下载
 81 |     if (freetile_status.getErrorTileCount() == 0) {
 82 |         return;
 83 |     }
 84 |     else {
 85 |         let promises = [];
 86 |         const xyzs = freetile_status.getErrorTiles();
 87 |         for (let i = 0; i < xyzs.length; i++) {
 88 |             promises.push(getTile2Disk(xyzs[i]));
 89 |             //根据访问并发设置，并发请求
 90 |             if (promises.length == TileConfig.parallel) {
 91 |                 await Promise.all(promises);
 92 |                 promises = [];
 93 |             }
 94 |         }
 95 |         if (promises.length > 0) {
 96 |             await Promise.all(promises);
 97 |             promises = [];
 98 |         }
 99 |         errorTileTask();
100 |     }
101 | }
102 | 
103 | 
104 | 
105 | //切片下载
106 | function getTile2Disk(xyz) {
107 |     var p = new Promise(function (resolve, reject) {
108 |         //存储到本地的目录
109 |         const target = `${TileConfig.downPath}/${xyz[0]}/${xyz[1]}/${xyz[2]}.${TileConfig.tileformat}`;
110 |         if (fs.existsSync(target)) {
111 |             freetile_status.addSuccessTile(xyz);
112 |             resolve('success');
113 |             return;
114 |         }
115 |         //在线切片url地址
116 |         let source = getTileUrl(TileConfig.mapurl, xyz, TileConfig.tokenInfo);
117 |         //递归创建目录
118 |         createDirs(target);
119 |         const userAgent = getRandomUserAgent();
120 |         //设置一些token什么的
121 |         if (!TileConfig.tokenInfo) {
122 |             //从远程服务器请求 切片，写入本地磁盘文件
123 |             superagent.get(source)
124 |                 .responseType('blob')
125 |                 .set(userAgent).timeout({
126 |                     response: 20000,
127 |                     deadline: 40000,
128 |                 })
129 |                 .retry(0)
130 |                 .end(getTileCallback);
131 |         }
132 |         else {
133 |             if (TileConfig.tokenInfo.location === "url") {
134 |                 const token_key = TileConfig.tokenInfo.key;
135 |                 const token_value = getRandomToken(TileConfig.tokenInfo.values);
136 |                 if (source.includes('?'))
137 |                     source = `${source}&${token_key}=${token_value}`;
138 |                 else
139 |                     source = `${source}?${token_key}=${token_value}`;
140 |                 //从远程服务器请求 切片，写入本地磁盘文件
141 |                 superagent.get(source)
142 |                     .responseType('blob')
143 |                     .set(userAgent).timeout({
144 |                         response: 30000,
145 |                         deadline: 60000,
146 |                     })
147 |                     .retry(3)
148 |                     .end(getTileCallback);
149 |             }
150 |             else if (TileConfig.tokenInfo.location === "headers") {
151 |                 const token_key = TileConfig.tokenInfo.key;
152 |                 const token_value = getRandomToken(TileConfig.tokenInfo.values);
153 |                 //从远程服务器请求 切片，写入本地磁盘文件
154 |                 superagent.get(source)
155 |                     .responseType('blob')
156 |                     .set(token_key, token_value)
157 |                     .set(userAgent).timeout({
158 |                         response: 30000,
159 |                         deadline: 60000,
160 |                     })
161 |                     .retry(3)
162 |                     .end(getTileCallback);
163 |             }
164 |         }
165 |         function getTileCallback(err, res) {
166 |             if (err) {
167 |                 console.log(xyz);
168 |                 freetile_status.addErrorTile(xyz);
169 |                 reject(err);
170 |             } else {
171 |                 if (res.status == 200) {
172 |                     //写入磁盘
173 |                     fs.writeFileSync(target, res.body);
174 |                     freetile_status.addSuccessTile(xyz);
175 |                     resolve('success');
176 |                 }
177 |             }
178 |         }
179 | 
180 |     }).then(undefined, (error) => {
181 |         //错误不做额外处理
182 |     });
183 |     return p;
184 | }
185 | 
186 | 
187 | 
188 | module.exports = run;


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