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service.js
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service.js
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//http协议模块
var http = require('http');
//url解析模块
var url = require('url');
//文件系统模块
var fs = require("fs");
//路径解析模块
var path = require("path");
// request 请求
var request = require('request');
// images
var images = require("images");
images.setLimit(262144, 262144) //2^18 262144
// map 服务
require("./examples/js/map.js");
// 创建一个服务
var httpServer = http.createServer(function (req, res) {
var urlStr = req.url
var reqURL = url.parse(urlStr, true)
var urlPathname = reqURL.pathname
var query = reqURL.query
var pathname = __dirname + urlPathname;
if (path.extname(pathname) == "") {
pathname += "/";
}
switch (urlPathname) {
case '/map/export':
try { //一般是 超出图片大小(错误的经纬度范围)
exportService(res, query)
} catch (error) {
console.log(error)
}
break;
}
})
//在指定的端口监听服务
httpServer.listen(8574, function () {
console.log("[HttpServer][Start]", "a map server runing, port 8574");
});
//
var currentImages
function exportService(res, query) {
if (currentImages) {
res.end("正在导出，请勿重复执行！")
return;
}
var { provider, bbox, zoom, format } = query;
provider = provider || 'GaoDeProvider_ROAD';
zoom = zoom || 10;
format = format || 'png';
bbox = (bbox && bbox.split(',')) || [115.802, 40.21, 117.04, 39.6173]
var map = new TMap(provider)
var tileLT = map.getTile(parseFloat(bbox[0]), parseFloat(bbox[1]), zoom) //左上
var tileRB = map.getTile(parseFloat(bbox[2]), parseFloat(bbox[3]), zoom) //右下
//
var coorLT = tileLT.coordinate
var minCol = coorLT.column;
var minRow = coorLT.row;
//
var coorRB = tileRB.coordinate
var maxCol = coorRB.column;
var maxRow = coorRB.row;
//
var provider = tileLT.provider;
var numRows = maxRow - minRow + 1
var numCols = maxCol - minCol + 1
var tiles = [];
//request google地图禁止访问？ 256*256
for (var row = minRow; row <= maxRow; row++) {
for (var col = minCol; col <= maxCol; col++) {
var coor = new map.Coordinate(row, col, zoom)
var urls = provider.getTileUrls(coor)
var x = (col - minCol) * 256
var y = (row - minRow) * 256
tiles.push({ url: urls[0], x: x, y: y });
//drawImage(urls[0], x, y)
}
}
var num = tiles.length;
var filtPath = './dist/mapImage/' + new Date().getTime() + '.' + format;
if (num < 10000) { //大于10000的时候 内存不够
currentImages = {
num: num,
count: 0,
reqNum: 128,//128:250k/s
tiles: tiles,
content: images(numRows * 256, numCols * 256),//内存问题
export: filtPath
}
reqImages();
}
res.writeHead(200, { 'Content-Type': 'html' });
// res.writeHead(200, { 'Content-Type': 'text/plain;charset=utf-8' });
res.write(`
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>nodejs-dmap</title>
</head>
<body>${
'视野范围：' + bbox.toString() + "<br/>" +
'切片级别：' + zoom + "<br/>" +
'切片坐标范围：' +
[minCol, minRow].toString() + ' ' +
[maxCol, maxRow].toString() + "<br/>" +
'切片行数：' + numRows + "<br/>" +
'切片列数：' + numCols + "<br/>" +
'切片数：' + num + "<br/>" +
'导出路径：' + `<a href="${filtPath}">${filtPath}</a>`
}
</body>
</html>
`);
res.end(
)
}
function reqImages() {
var tiles = currentImages.tiles;
var reqNum = currentImages.reqNum;
currentImages.toCount = currentImages.count > 0 ? currentImages.count + reqNum : reqNum / 2;
var i = 0;
console.log(currentImages.count, currentImages.toCount)
while (i < reqNum && tiles.length > 0) {
i++;
var tile = tiles.shift();
tile.reNum = 0;
drawImage(tile);
}
}
//
function drawImage(tile) {
request({
timeout: 3000, //需要设置超时，因为网络问题
jar: true,//记住 cookie
encoding: null,//不设置为空，则body为字符串
url: tile.url
}, function (error, response, body) {
var content = currentImages.content;
if (!error && response.statusCode == 200) {
if (Buffer.isBuffer(body)) {
currentImages.count++
content.draw(images(body), tile.x, tile.y)
if (currentImages.count >= currentImages.toCount) {
reqImages();
}
} else {
tile.reNum++;
drawImage(tile)
}
} else if (tile.reNum > 128) { //重复请求次数
console.log('超时错误！')
currentImages.count++
} else {
console.log(error) //一般是timeout
drawImage(tile)
}
if (currentImages.count >= currentImages.num) {
console.log('截取成功！', currentImages.count)
content.save(currentImages.export)
console.log('导出成功!', currentImages.export)
//为什么只有下次请求的时候才会释放内存？内存没变化的话不做gc?
currentImages.content = null
currentImages = null
}
})
}
// if (pathname.charAt(pathname.length - 1) == "/") {
// pathname += "index.html";
// }
// if (path.isAbsolute(pathname)) {
// switch (path.extname(pathname)) {
// case ".html":
// res.writeHead(200, {
// "Content-Type": "text/html"
// });
// break;
// case ".js":
// res.writeHead(200, {
// "Content-Type": "text/javascript"
// });
// break;
// case ".css":
// res.writeHead(200, {
// "Content-Type": "text/css"
// });
// break;
// case ".gif":
// res.writeHead(200, {
// "Content-Type": "image/gif"
// });
// break;
// case ".jpg":
// res.writeHead(200, {
// "Content-Type": "image/jpeg"
// });
// break;
// case ".png":
// res.writeHead(200, {
// "Content-Type": "image/png"
// });
// break;
// default:
// res.writeHead(200, {
// "Content-Type": "application/octet-stream"
// });
// }
// fs.readFile(pathname, function (err, data) {
// if(data){
// res.end(data);
// }
// });
// } else {
// switch (urlPathname) {
// default:
// res.writeHead(404, {
// "Content-Type": "text/html"
// });
// res.end("<h1>404 Not Found</h1>");
// }
// }
// }