部署时使用 npm 包的 Meteor 错误

Question

所以我尝试使用名为 html-pdf 的 NPM 包将 PDF 打印到客户端，在本地一切正常。我使用了一种迂回的方法来做到这一点，我使用 Meteor.call 调用一个服务器方法，然后从 pdf 中获取缓冲的输出并将其粘贴到一个集合中。我使用自动订阅来收听具有当前用户 ID 的新 pdf，然后使用包将 pdf 保存到浏览器。以下重要代码片段：

客户端/helpers.js

Meteor.autosubscribe(function() {
PdfsCollection.find().observe({
    added: function(item){
        var blob = new Blob([item.pdf], {type: 'application/pdf'});
        console.log('new pdf found');
        saveAs(blob, 'test.pdf');
        PdfsCollection.remove({_id: item._id});
    }
});
});

client/templates/quotes/quotes.js：

Template.QuotesEdit.events({
"click #pdf" : function(event, template) {

    var html = Blaze.toHTML(Blaze.With(template.data, function() { return Template.QuotePrint; }));
    Meteor.call('createPDF', html, Meteor.userId());

}
});

服务器/pdf.js：

Meteor.methods({
createPDF: function(html, userId) {
    var pdf = Meteor.npmRequire('html-pdf');

    pdf.create(html).toBuffer(Meteor.bindEnvironment(function(err,buffer) {
        PdfsCollection.insert({userId: userId, pdf: buffer});
    }));
  }
});

导致错误的部分是我实际调用 pdf.create 的时候。有两个错误，在服务器日志中我得到了这个：

[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] WARNING events.js:72
throw er; // Unhandled 'error' event
^
[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] WARNING Error: write EPIPE
at errnoException (net.js:905:11)
at Object.afterWrite (net.js:721:19)
[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] ERROR Application crashed with code: 8
[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] NOTICE Starting application on port 9000
[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] INFO STATUS running -> starting
[Wed Apr 08 2015 03:23:16 GMT+0000 (UTC)] INFO STATUS starting -> running

在浏览器控制台中是这样的：

GET https://ddp--3484-metcrm.meteor.com/sockjs/info?cb=qtrpq640d2 6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 w._start6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 (anonymous function)setTimeout (async)6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 n.delay6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 n.XHRLocalObject6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 X.doXhr6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 (anonymous function)setTimeout (async)6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 n.delay6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 X6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 q6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 T6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:34 a.extend._launchConnection6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:34 a.extend._retryNow6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:3 t.extend.withValue6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:3 n6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:3 e.bindEnvironmentsetTimeout (async)6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:3 t.extend.setTimeout6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:19 t.extend.retryLater6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:34 a.extend._retryLater6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:34 a.extend._lostConnection6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:34 a.extend._launchConnection.t.socket.onclose6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 r.dispatchEvent6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 (anonymous function)setTimeout (async)6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 n.delay6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 T._didClose6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 o._ir.onfinish6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 a.emit6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 X.doXhr.a.onfinish6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 a.emit6f6418a2bd63d77a57cb8a21c5b677d0f83c8d36.js:32 w._start.a.xhr.onreadystatechange
oLxjjRxydCC5AuDig:1 XMLHttpRequest cannot load https://ddp--3484-metcrm.meteor.com/sockjs/info?cb=qtrpq640d2. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://metcrm.meteor.com' is therefore not allowed access. The response had HTTP status code 503.

我现在已经绞尽脑汁 3 个小时试图在我的本地服务器上找到这个工作的来源，但在 Meteor 上却没有。这里的两个重要包是： meteorhacks:npm（用于在流星中使用 npm 包） pfafman:filesaver（用于我正在使用的 saveas 功能）

感谢您的帮助！

Answer 1

我发现这实际上是由在 meteor.com 托管上创建的临时文件的文件权限引起的。我部署到 Modulus.io，一切都按预期工作。