短篇小说：
如果方法执行超过120秒，Meteor方法会循环。
这是我测试的方式
服务器端有一个名为'build'的Meteor方法，如下所示：
'build': function(buildRequest) {
log.info('method build get called: buildRequest=%s', JSON.stringify(buildRequest));
shell.exec('echo "simulate long Android build task."');
shell.exec('sleep ' + buildRequest.sec);
var result = {'successful': true, 'output': "OK", 'fileName': 'test.apk', 'genFile': '/tmp/test.apk'}
log.info("method return result=%s", JSON.stringify(result));
return result;
}
我设置路由来调用此方法如下：
this.route('buildApp', {
where: 'server'
, action: function() {
var buildRequest = this.request.query;
log.info('buildApp: http parameters: ', buildRequest);
var result = methods.build(buildRequest);
var response = this.response;
if (result.successful) {
methods.download(response, result.genFile, result.fileName);
}
else {
response.writeHead(500, {});
response.end("server has error: " + result.output);
}
}
})
然后，我打电话给网址
http://localhost:3000/buildApp?app=test&server=dev&db=DB&appId=test&sec=120
然后，构建方法循环
=> App running at: http://localhost:3000/
I20150109-14:55:45.285(9)? info: buildApp: http parameters: app=test, server=dev, db=DB, appId=test, sec=120
I20150109-14:55:45.358(9)? info: method build get called: buildRequest={"app":"test","server":"dev","db":"DB","appId":"test","sec":"120"}
I20150109-14:55:45.358(9)? simulate long Android build task.
I20150109-14:57:45.359(9)? info: method return result={"successful":true,"output":"OK","fileName":"test.apk","genFile":"/tmp/test.apk"}
I20150109-14:57:45.387(9)? info: buildApp: http parameters: app=test, server=dev, db=DB, appId=test, sec=120
I20150109-14:57:45.387(9)? info: method build get called: buildRequest={"app":"test","server":"dev","db":"DB","appId":"test","sec":"120"}
I20150109-14:57:45.446(9)? simulate long Android build task.
我认为它与此代码相关：
长篇故事：
我使用Meteor创建了一个简单的Android应用构建屏幕。
一切都运作良好但是如果我提交表单来构建应用程序，它会一遍又一遍地构建。即使我停止服务器并重新启动，只要服务器重新启动，它就会再次调用。
如果填写并提交了表单，我会调用Meteor'build'方法。
该方法将克隆git存储库并通过调用下面的shell脚本来构建应用程序。
var exec = shell.exec('./genApp.sh ' + buildRequest.appId + " " + buildRequest.server + " " + buildRequest.db);
//var exec = shell.exec('echo "simple task will not loop"');
如果我打电话给./genApp.sh（这将需要几分钟。），那么Meteor'build'方法会循环播放。但如果我做了简单的任务，它就不会循环而是执行一次。
我在构建Meteor方法的开头添加了下面的代码来阻止它进行调试。但我不知道是什么导致了这一点。
if (a == 1) {
a = 0;
throw new Error("Why call again?!");
}
++ a;
服务器日志：
I20150108-19:48:08.220(9)? info: success
I20150108-19:48:08.221(9)? info: return result=[object Object]
I20150108-19:48:09.034(9)? Exception while invoking method 'build' Error: Why call again?!
I20150108-19:48:09.035(9)? at [object Object].methods.build (app/javis.js:92:25)
I20150108-19:48:09.035(9)? at maybeAuditArgumentChecks (packages/ddp/livedata_server.js:1599:1)
I20150108-19:48:09.035(9)? at packages/ddp/livedata_server.js:648:1
I20150108-19:48:09.035(9)? at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20150108-19:48:09.035(9)? at packages/ddp/livedata_server.js:647:1
I20150108-19:48:09.035(9)? at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20150108-19:48:09.036(9)? at [object Object]._.extend.protocol_handlers.method (packages/ddp/livedata_server.js:646:1)
I20150108-19:48:09.036(9)? at packages/ddp/livedata_server.js:546:1
主要源代码
var APP_01 = 'app01-andy';
var APP_02 = 'app02-andy';
if (Meteor.isClient) {
Router.configure({
layoutTemplate: 'layout'
})
Router.map(function() {
this.route('/', 'home');
});
buildRequest = {
appId: 0
, server: 'dev'
, db: 'DEFAULT'
, app: APP_01
};
Session.set('successful', false);
Session.set('output', '');
Session.set('downloadLink', null);
Template.home.helpers({
successful: function() {
return Session.get('successful');
}
, output: function() {
return Session.get('output');
}
, downloadLink: function() {
var successful = Session.get('successful');
var downloadLink = Session.get('downloadLink');
console.log(downloadLink);
if (successful) {
$('#downloadLink').show();
} else {
$('#downloadLink').hide();
}
return downloadLink;
}
});
Template.home.events({
'submit .app-build-form': function() {
event.preventDefault();
buildRequest.appId = event.target.appId.value;
buildRequest.server = event.target.server.value;
buildRequest.db = event.target.db.value;
buildRequest.app = event.target.app.value;
$("#submit").prop('disabled', true);
Meteor.call('build', buildRequest, function(error, result) {
console.log(JSON.stringify(result));
Session.set('successful', result.successful);
Session.set('output', result.output);
Session.set('downloadLink', '/downloadApp?fullPathFile='+result.genFile+'&fileName='+result.fileName);
$("#submit").prop('disabled', false);
console.log("meteor call end");
});
console.log("submit finished");
// prevent default form submit.
return false;
},
'click #sel_app': function() {
console.log(event.target.value);
var app = event.target.value;
var selDb = $("#sel_db");
if (app === APP_02) {
selDb.val('APP_02_DB'); selDb.prop('disabled', true);
}
else {
selDb.prop('disabled', false);
}
}
});
}
if (Meteor.isServer) {
var shell = Meteor.npmRequire('shelljs');
var log = Meteor.npmRequire('winston');
var a = 0;
var methods = {
'build': function(buildRequest) {
if (a == 1) {
a = 0;
throw new Error("Why call again?!");
}
++ a;
log.info(JSON.stringify(buildRequest));
var dir = shell.pwd();
log.info("work dir: %s", dir);
shell.cd('/project/build/');
var branch = null;
var app = buildRequest.app;
if (app === APP_01) {
branch = '2.0';
}
else if (app === APP_02) {
branch = '1.0';
}
else {
branch = 'master';
}
shell.exec('rm -rf ' + buildRequest.app);
shell.exec('git clone -b '+branch+' ssh://git@company-build.com/'+buildRequest.app+'.git');
shell.cd(buildRequest.app + "/app");
var exec = shell.exec('./genApp.sh ' + buildRequest.appId + " " + buildRequest.server + " " + buildRequest.db);
//var exec = shell.exec('echo "simple task will not loop"');
var code = exec.code;
var output = exec.output;
log.info(code);
log.info(output);
var fileName = null;
var matches = output.match(/The package copied to (.+apk)/);
var genFile = null;
if (matches != null && matches.length > 1) {
genFile = matches[1];
log.info(genFile);
// TODO : do not write file in public, http://stackoverflow.com/questions/13201723/generating-and-serving-static-files-with-meteor
/*
shell.mkdir(process.env.PWD + '/tmp');
shell.cp('-f', genFile, process.env.PWD + '/tmp');
*/
fileName = genFile.substring(genFile.lastIndexOf('/') + 1);
}
matches = output.match(/BUILD SUCCESSFUL/);
var successful = false;
if (matches != null && matches.length > 0) {
log.info("success");
successful = true;
}
var result = {'successful': successful, 'output': output, 'fileName': fileName, 'genFile': genFile};
log.info("return result="+result);
return result;
}
, 'download' : function(response, fullPathFile, fileName) {
var stat = fs.statSync(fullPathFile);
response.writeHead(200, {
'Content-Type': 'application/vnd.android.package-archive'
, 'Content-Length': stat.size
, 'Content-Disposition': 'attachment; filename=' + fileName
});
fs.createReadStream(result.genFile).pipe(response);
}
};
Meteor.methods(methods);
fs = Npm.require('fs');
Router.map(function() {
this.route('buildApp', {
where: 'server'
, action: function() {
var buildRequest = this.request.query;
log.info(this.request.query);
log.info(buildRequest);
var result = methods.build(buildRequest);
var response = this.response;
if (result.successful) {
methods.download(response, result.genFile, result.fileName);
}
else {
response.writeHead(500, {});
response.end("server has error: " + result.output);
}
}
}),
this.route('downloadApp', {
where: 'server'
, action: function() {
var params = this.request.query;
var fullPathFile = params.fullPathFile;
var fileName = params.fileName;
methods.download(this.response, fullPathFile, fileName);
}
})
});
Meteor.startup(function () {
// code to run on server at startup
});
}
导致循环的原因是什么？任何帮助将不胜感激。
即使我打电话给http://localhost:3000/buildApp?app=xxx&server=live&db=DB&appId=12423，构建循环。
如果我将./genApp.sh更改为简单条件以缩小条件，则可以。
#!/bin/bash
echo "test"
echo "The package copied to /service/release/20150108/existing-file.apk"
echo "BUILD SUCCESSFUL"
sleep 180
睡眠180秒时再次调用。什么使这个电话再次？因为我直接打电话给网址。我认为没有客户端代码重审。
答案 0 :(得分：0)
嗯...当shell.exec同步运行时，它可能会使事件循环变为“＃34;”，从而导致一些问题。
解决方案是使用Future允许Meteor在等待Fiber完成时继续在另一个shell.exec中运行。
var Future = Npm.require('fibers/future');
Meteor.methods({
'build': function(buildRequest) {
var fut = new Future(), result;
log.info('method build get called: buildRequest=%s', JSON.stringify(buildRequest));
shell.exec('echo "simulate long Android build task."');
shell.exec('sleep ' + buildRequest.sec, function(code, output){
fut.return([code, output]);
});
result = fut.wait();
log.info(result[0], result[1])
var result = {'successful': true, 'output': "OK", 'fileName': 'test.apk', 'genFile': '/tmp/test.apk'}
log.info("method return result=%s", JSON.stringify(result));
return result;
}
});
答案 1 :(得分：0)
使这项工作成功的傻瓜方式：
以下是一个如何构建结构的示例[未经过bug测试]：
"use strict";
var fs, shell, log, Future;
// need a collection to store build requests & their status
var Builds = new Mongo.Collection('builds');
var APP_01 = 'app01-andy';
var APP_02 = 'app02-andy';
// expose routes to client & server
Router.configure({
layoutTemplate: 'layout'
});
Router.map(function() {
this.route('/', 'home');
this.route('downloadApp', {
where: 'server'
, action: function() {
var params = this.request.query,
buildId = params.buildId,
build, stat;
check(buildId, String); // or Mongo Identifier
build = Builds.findOne({_id: buildId});
check(build, Match.ObjectIncluding({
file: String,
fileName: String
}));
stat = fs.statSync(build.file);
this.response.writeHead(200, {
'Content-Type': 'application/vnd.android.package-archive'
, 'Content-Length': stat.size
, 'Content-Disposition': 'attachment; filename=' + build.fileName
});
fs.createReadStream(build.file).pipe(this.response);
}
});
});
if (Meteor.isClient) {
Session.set('currentBuildId', null);
Session.set('submittingBuildRequest', false);
Tracker.autorun(function(){
// Whenever there is a current build set, subscribe to it.
var buildId = Session.get('currentBuildId');
if (buildId != null){
Meteor.subscribe('build', buildId);
}
});
Template.home.helpers({
// Use this helper in your template to expose the `state` property (queued, running, success, failed)
currentBuild: function() {
var buildId = Session.get('currentBuildId'), build;
if (buildId == null) return null;
build = Builds.findOne({_id: buildId});
if (build == null) return null;
return build;
}
});
Template.home.events({
'submit .app-build-form': function(e) {
var target, buildRequest;
e.preventDefault();
target = e.target;
buildRequest = {
appId: target.appId.value
, server: target.server.value
, db: target.db.value
, app: target.app.value
};
Session.set('submittingBuildRequest', true);
Meteor.call('requestBuild', buildRequest, function(error, buildId) {
Session.set('submittingBuildRequest', false);
if (error != null){
console.error(error);
} else {
console.log("buildId=", JSON.stringify(buildId));
Session.set('currentBuildId', buildId);
}
});
},
'click #sel_app': function(e) {
var app = e.target.value;
var selDb = $("#sel_db");
if (app === APP_02) {
selDb.val('APP_02_DB'); selDb.prop('disabled', true);
}
else {
selDb.prop('disabled', false);
}
},
'click a.downloadCurrentBuild': function(){
// Alternatively, could create a download url with the "pathFor" template helper
Router.go('downloadApp', {buildId: Session.get('currentBuildId')})
}
});
}
if (Meteor.isServer) {
fs = Npm.require('fs');
shell = Meteor.npmRequire('shelljs');
log = Meteor.npmRequire('winston');
Future = Npm.require('fibers/future');
Meteor.publish({
'build': function(buildId){
check(buildId, String); // or Mongo Identifier
return Builds.find({_id: buildId}, {fields: {
fileName: false, // don't expose real paths to client
file: false
}});
}
});
Meteor.methods({
'requestBuild': function(buildRequest){
check(buildRequest, {
appId: Match.Integer,
server: String, // apply additional restrictions
db: String, // apply additional restrictions
app: Match.OneOf(APP_01, APP_02)
});
_.extend(buildRequest, {
state: 'queued'
// These properties will be set later, just keeping them here for reference
//, output: null
//, fileName: null
//, file: null
});
return Builds.insert(buildRequest);
}
});
var Builder = {
// Alternative: Poll the database for new builds
//run: function Builder_Run() {
// log.info('checking for "queued" builds');
// // may need to change this to `fetch` and then loop manually
// Builds.find({state: 'queued'}).forEach(Builder.processBuildRequest);
// Meteor.setTimeout(Builder.run, 1000); // tail call to run again (after 1 second)
//},
exec: function(cmd){
// Wraps shell.exec so that they don't block the event loop
var fut = new Future();
shell.exec(cmd, function(code, output){
fut.return({code: code, output: output});
});
return fut.wait();
},
processBuildRequest: function Builder_processBuildRequest(buildRequest) {
console.log('running buildRequest=', JSON.stringify(buildRequest));
Builds.update({_id: buildRequest._id}, {
$set: {
state: 'running'
}
});
var branch = null;
if (buildRequest.ap === APP_01) {
branch = '2.0';
}
else if (buildRequest.ap === APP_02) {
branch = '1.0';
}
else {
branch = 'master';
}
shell.cd('/project/build/');
Builder.exec('rm -rf ' + buildRequest.app);
Builder.exec('git clone -b ' + branch + ' ssh://git@company-build.com/' + buildRequest.app + '.git');
shell.cd(buildRequest.app + "/app");
//var exec = Builder.exec('./genApp.sh ' + buildRequest.appId + " " + buildRequest.server + " " + buildRequest.db)
var exec = Builder.exec('sleep 180');
var output = exec.output;
log.info("code=" + exec.code);
log.info("output=" + output);
var fileName = null;
var matches = output.match(/The package copied to (.+apk)/);
var file = null;
if (matches != null && matches.length > 1) {
file = matches[1];
log.info("file=" + file);
fileName = file.substring(file.lastIndexOf('/') + 1);
}
matches = output.match(/BUILD SUCCESSFUL/);
if (matches != null && matches.length > 0) {
log.info("success");
Builds.update({_id: buildRequest._id}, {
$set: {
state: 'success',
file: file,
fileName: fileName,
output: output
}
});
} else {
log.info("failed");
Builds.update({_id: buildRequest._id}, {
$set: {
state: 'failed'
}
});
}
}
};
Meteor.startup(function () {
// code to run on server at startup
// if using polling method
//Meteor.setTimeout(Builder.run, 1000); // will poll for new builds every second (unless already running a build)
// set up an observe [to run forever] to automatically process new builds.
Builds.find({state: 'queued'}).observe({
added: Builder.processBuildRequest
});
});
}