我有一个具有多个功能的api调用。除了可以为每种方法应用错误处理之外，还可以使用将错误发送给UI开发人员的全局错误处理代码。
代码如下：
app.post('/billing/pricingdetails', function (req, res) {
console.log('pricing api called');
var workload = req.body;
var resourcelevelPricing = {};
var response = {};
var workloadinfo = {
workloadId: workload.workloadId,
ownerId: workload.ownerId,
uniqueName: workload.uniqueName,
name: workload.name
}
var pricing = {}
var allresourceIdentifiers;
if (workload.elements && workload.elements.length > 0) {
var elementlevelpricingSummary = {};
var elementArray = [];
var allresourceIdentifierArray = [];
var elementinfo = {};
var metadataModified = {};
var elementsParam = workload.elements;
// handle configurable resource
var configurableElementarray = [];
// create array of all the elements in workloadjson - to be used for resourcelevel (instance/image), charamountunitlevel, resourcetypelevel pricing detail
for (var index in elementsParam) {
// if condition skips the uri of configurable resources - handle configurable resource
if(!elementsParam[index].parameters.ResourceParameters)
{
allresourceIdentifierArray.push(elementsParam[index].uri);
if (elementsParam[index].parameters.imageUri) {
allresourceIdentifierArray.push(elementsParam[index].parameters.imageUri);
}
}
}
var allresourceIdentifiers = allresourceIdentifierArray.join(',');
// call the functionalities that gives the each level of pricing detail synchronously to construct the workload json
async.series([
function (callback) {
getpricingSummary(elementsParam, function (err, workloadinfo) {
if(err){
}
else
{
callback(null, workloadinfo);
}
});
},
function (callback) {
getPricingforResourceIdentifiers(allresourceIdentifiers, function (err, pricingDetail) {
pricing.resourceLevel = pricingDetail;
callback(null, pricingDetail);
});
},
function (callback) {
getchargeamountunitlevelPricing(allresourceIdentifiers, function (err, pricingDetail) {
//merge configurable resource with concrete resource pricing details - handle configurable resource
if(configurableElementarray.length > 0)
{
var concatednatedArray = pricingDetail.concat(configurableElementarray);
var finalResult = [];
var i = concatednatedArray.reduce(function (result, o) {
var key = o.chargeAmountUnit + o.currencyCode;
if (!(key in result)) {
result.arr.push(result[key] = o);
finalResult.push(result);
}
else {
result[key].chargeAmount += Number(o.chargeAmount);
}
return result;
}, { arr: [] }).arr;
pricing.chargeamountunitLevel = i;
trace.info(i);
}
else
{
pricing.chargeamountunitLevel = pricingDetail;
}
callback(null, pricingDetail);
});
},
function (callback) {
getresourcetypelevelPricing(allresourceIdentifiers, function (err, pricingDetail) {
if(configurableElementarray.length > 0)
{
var concatednatedArray = pricingDetail.concat(configurableElementarray);
var i = concatednatedArray.reduce(function (result, o) {
var key = o.chargeAmountUnit + o.currencyCode + o.Name;
if (!(key in result)) {
result.arr.push(result[key] = o);
}
else {
result[key].chargeAmount += o.chargeAmount;
}
return result;
}, { arr: [] }).arr;
pricing.resourcetypeLevel = i;
trace.info(i);
}
else
{
pricing.resourcetypeLevel = pricingDetail;
}
callback(null, pricingDetail);
});
}
],
function (err, result) {
workloadinfo.pricing = pricing;
res.send(workloadinfo);
});
// get element level pricing summary for each elements (vm/vs) in the array within workload json - the output to be appended within metadata of workload json
function getpricingSummary(elementsParam, callback) {
async.forEachSeries(elementsParam, createResponse, function (err,result) {
return callback(null, result);
});
};
// this method called by async.forEachSeries passing each elements (vm/vs) of workload
function createResponse(elements, callback) {
var resourceIdentifierArray = [];
elementinfo = elements;
resourceIdentifierArray.push(elements.uri);
if (elements.parameters.imageUri) {
resourceIdentifierArray.push(elements.parameters.imageUri);
}
// build string of resourceIdentifier (instance/image) for input element
var resourceIdentifiers = resourceIdentifierArray.join(',');
console.log(resourceIdentifiers);
if(elements.parameters.ResourceParameters)
{
trace.info('1');
trace.info(elements.parameters.ResourceParameters);
var configJson = JSON.parse(elements.parameters.ResourceParameters);
trace.info(Number(configJson.cpuCount));
metadataModified = elements.metadata;
// TODO : Remove this hard-coding
elementlevelpricingSummary.Name = 'Hardware';
if(configJson.totalUnitPrice)
{
var chargeAmount = configJson.totalUnitPrice;
elementlevelpricingSummary.chargeAmount = Math.round(chargeAmount * 100)/100;
}
if(configJson.ChargeAmountUnit)
{
var chargeAmountUnit = configJson.ChargeAmountUnit;
elementlevelpricingSummary.chargeAmountUnit = configJson.ChargeAmountUnit;
}
if(configJson.CurrencyCode)
{
var currencyCode = configJson.CurrencyCode;
elementlevelpricingSummary.currencyCode = configJson.CurrencyCode;
}
metadataModified.pricingSummary = elementlevelpricingSummary;
configurableElementarray.push(elementlevelpricingSummary);
// delete original metadata from workload json (to be replaced by metadata containing pricing summary)
delete elementinfo.metadata;
elementinfo.metadata = metadataModified;
elementArray.push(elementinfo);
// global workloadinfo variable is appended with array of elements with its pricing summary within metadata of respective elements
workloadinfo.elements = elementArray;
return callback();
}
else
{
// Get element level pricing summary
mysql.elementlevelpricing(resourceIdentifiers, conn, function (result) {
elementlevelpricingSummary = result;
metadataModified = elements.metadata;
metadataModified.pricingSummary = elementlevelpricingSummary;
// delete original metadata from workload json (to be replaced by metadata containing pricing summary)
delete elementinfo.metadata;
elementinfo.metadata = metadataModified;
elementArray.push(elementinfo);
// global workloadinfo variable is appended with array of elements with its pricing summary within metadata of respective elements
workloadinfo.elements = elementArray;
return callback(null,workloadinfo);
});
}
};
function getPricingforResourceIdentifiers(resourceIdentifiers, callback) {
mysql.pricingDetail(resourceIdentifiers, conn, function (result) {
return callback(null, result);
});
};
function getchargeamountunitlevelPricing(resourceIdentifiers, callback) {
mysql.chargeamountunitlevelPricing(resourceIdentifiers, conn, function (result) {
return callback(null, result);
});
};
function getresourcetypelevelPricing(resourceIdentifiers, callback) {
mysql.resourcetypelevelPricing(resourceIdentifiers, conn, function (result) {
return callback(null, result);
});
};
};
});
使用Express，您可以安装错误处理程序，该错误处理程序将在您的任何路由中发生错误时调用：
// somewhere at the end of your middleware/route chain
app.use(function(err, req, res, next) {
res.send(500, err.message); // or whatever you want to send back
});
仍然最好重新抛出代码中发生的任何错误：
if (err) throw err;
另外，由于您正在使用async，因此您始终可以将错误传播回去：
if (err) return callback(err);
并处理最终回调中的错误。
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