“流星代码必须在光纤中运行”服务器上调用Collection.insert时“流星代码必须在光纤中运

2019-05-13 13:22发布

我在服务器/ statusboard.js下面的代码;

var require = __meteor_bootstrap__.require,
    request = require("request")   


function getServices(services) {
  services = [];
  request('http://some-server/vshell/index.php?type=services&mode=json', function (error, response, body) {
    var resJSON = JSON.parse(body);
     _.each(resJSON, function(data) {
       var host = data["host_name"];
       var service = data["service_description"];
       var hardState = data["last_hard_state"];
       var currState = data["current_state"];
       services+={host: host, service: service, hardState: hardState, currState: currState};
       Services.insert({host: host, service: service, hardState: hardState, currState: currState});
    });
  });
}

Meteor.startup(function () {
  var services = [];
  getServices(services);
  console.log(services);
});

基本上,它是从一个JSON提要拉一些数据,并试图将其推到一个集合。

当我开始了我流星出现以下情况例外;

app/packages/livedata/livedata_server.js:781
      throw exception;
            ^
Error: Meteor code must always run within a Fiber
    at [object Object].withValue (app/packages/meteor/dynamics_nodejs.js:22:15)
    at [object Object].apply (app/packages/livedata/livedata_server.js:767:45)
    at [object Object].insert (app/packages/mongo-livedata/collection.js:199:21)
    at app/server/statusboard.js:15:16
    at Array.forEach (native)
    at Function.<anonymous> (app/packages/underscore/underscore.js:76:11)
    at Request._callback (app/server/statusboard.js:9:7)
    at Request.callback (/usr/local/meteor/lib/node_modules/request/main.js:108:22)
    at Request.<anonymous> (/usr/local/meteor/lib/node_modules/request/main.js:468:18)
    at Request.emit (events.js:67:17)
Exited with code: 1

我也不太清楚是什么错误表示。 没有人有任何的想法,也可以提出一个不同的做法?

Answer 1:

正如上面提到的,因为你的回调中执行代码。

你在服务器端运行任何代码需要被包含在纤维内。

试着改变你的getServices功能,如下所示:

function getServices(services) {
  Fiber(function() { 
    services = [];
    request('http://some-server/vshell/index.php?type=services&mode=json', function (error, response, body) {
      var resJSON = JSON.parse(body);
       _.each(resJSON, function(data) {
         var host = data["host_name"];
         var service = data["service_description"];
         var hardState = data["last_hard_state"];
         var currState = data["current_state"];
         services+={host: host, service: service, hardState: hardState, currState: currState};
         Services.insert({host: host, service: service, hardState: hardState, currState: currState});
      });
    });
  }).run();  
}

我只是碰到了类似的问题,这为我工作。 我不得不说虽然是我很新的这一点,我不知道这是怎么应该是这样的。

你也许可以逃脱只在光纤包装INSERT语句中,但我不积极。



Answer 2:

只是在纤维包裹你的功能可能不够,并可能导致意外的行为。

其原因是,与纤维一起,流星需要一组附着到纤维的变量。 流星使用附着于纤维作为动态范围,并与第三方API使用它的最简单的方法是使用数据Meteor.bindEnvironment

T.post('someurl', Meteor.bindEnvironment(function (err, res) {
  // do stuff
  // can access Meteor.userId
  // still have MongoDB write fence
}, function () { console.log('Failed to bind environment'); }));

如果您想了解更多请观看事件触发考虑到这些视频: https://www.eventedmind.com/posts/meteor-dynamic-scoping-with-environment-variables https://www.eventedmind.com/posts/meteor-什么-是-流星bindenvironment



Answer 3:

根据我的测试,你必须包装在代码中我测试类似于上面例子中的插入。

例如,我这样做,它仍然失败,纤维错误。

function insertPost(args) {
  if(args) {
Fiber(function() { 
    post_text = args.text.slice(0,140);
    T.post('statuses/update', { status: post_text }, 
        function(err, reply) {          
            if(reply){
                // TODO remove console output
                console.log('reply: ' + JSON.stringify(reply,0,4));
                console.log('incoming twitter string: ' + reply.id_str);
                // TODO insert record
                var ts = Date.now();
                id = Posts.insert({
                    post: post_text, 
                    twitter_id_str: reply.id_str,
                    created: ts
                });
            }else {
                console.log('error: ' + JSON.stringify(err,0,4));
                // TODO maybe store locally even though it failed on twitter
                // and run service in background to push them later?
            }
        }
    );
}).run();
  }
}

我这样做,它运行正常,没有错误。

function insertPost(args) {
  if(args) { 
post_text = args.text.slice(0,140);
T.post('statuses/update', { status: post_text }, 
    function(err, reply) {          
        if(reply){
            // TODO remove console output
            console.log('reply: ' + JSON.stringify(reply,0,4));
            console.log('incoming twitter string: ' + reply.id_str);
            // TODO insert record
            var ts = Date.now();
            Fiber(function() {
                id = Posts.insert({
                    post: post_text, 
                    twitter_id_str: reply.id_str,
                    created: ts
                });
            }).run();
        }else {
            console.log('error: ' + JSON.stringify(err,0,4));
            // TODO maybe store locally even though it failed on twitter
            // and run service in background to push them later?
        }
    }
);
  }
}

我想这可能帮助别人遇到此问题。 我还没有测试调用内部代码后,外部服务的asynchy类型和包装,在一个光纤。 这可能是值得的测试也是如此。 在我来说,我需要知道我做我的地方行动之前,在远程操作发生。

希望这有助于这个问题的线索。



文章来源: “Meteor code must always run within a Fiber” when calling Collection.insert on server