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http-outbound-probe.js
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http-outbound-probe.js
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/*******************************************************************************
* Copyright 2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
'use strict';
var Probe = require('../lib/probe.js');
var aspect = require('../lib/aspect.js');
var request = require('../lib/request.js');
var util = require('util');
var url = require('url');
var am = require('../');
var semver = require('semver');
var methods;
// In Node.js < v8.0.0 'get' calls 'request' so we only instrument 'request'
if (semver.lt(process.version, '8.0.0')) {
methods = ['request'];
} else {
methods = ['request', 'get'];
}
// Probe to instrument outbound http requests
function HttpOutboundProbe() {
Probe.call(this, 'http'); // match the name of the module we're instrumenting
}
util.inherits(HttpOutboundProbe, Probe);
function getRequestItems(options) {
var returnObject = { requestMethod: 'GET', urlRequested: '', headers: '' };
if (options !== null) {
var parsedOptions;
switch (typeof options) {
case 'object':
returnObject.urlRequested = formatURL(options);
parsedOptions = options;
break;
case 'string':
returnObject.urlRequested = options;
parsedOptions = url.parse(options);
break;
}
if (parsedOptions.method) { returnObject.requestMethod = parsedOptions.method; }
if (parsedOptions.headers) { returnObject.headers = parsedOptions.headers; }
}
return returnObject;
}
HttpOutboundProbe.prototype.attach = function(name, target) {
var that = this;
if (name === 'http') {
if (target.__outboundProbeAttached__) return target;
target.__outboundProbeAttached__ = true;
aspect.around(
target,
methods,
// Before 'http.request' function
function(obj, methodName, methodArgs, probeData) {
// Start metrics
that.metricsProbeStart(probeData);
that.requestProbeStart(probeData);
// End metrics
aspect.aroundCallback(
methodArgs,
probeData,
function(target, args, probeData) {
// Get HTTP request method from options
var ri = getRequestItems(methodArgs[0]);
that.metricsProbeEnd(probeData, ri.requestMethod, ri.urlRequested, args[0], ri.headers);
that.requestProbeEnd(probeData, ri.requestMethod, ri.urlRequested, args[0], ri.headers);
},
function(target, args, probeData, ret) {
// Don't need to do anything after the callback
return ret;
}
);
},
// After 'http.request' function returns
function(target, methodName, methodArgs, probeData, rc) {
// If no callback has been used then end the metrics after returning from the method instead
if (aspect.findCallbackArg(methodArgs) === undefined) {
// Need to get request method and URL again
var ri = getRequestItems(methodArgs[0]);
// End metrics (no response available so pass empty object)
that.metricsProbeEnd(probeData, ri.requestMethod, ri.urlRequested, {}, ri.headers);
that.requestProbeEnd(probeData, ri.requestMethod, ri.urlRequested, {}, ri.headers);
}
return rc;
}
);
}
return target;
};
// Get a URL as a string from the options object passed to http.get or http.request
// See https://nodejs.org/api/http.html#http_http_request_options_callback
function formatURL(httpOptions) {
var url;
if (httpOptions.protocol) {
url = httpOptions.protocol;
} else {
url = 'http:';
}
url += '//';
if (httpOptions.auth) {
url += httpOptions.auth + '@';
}
if (httpOptions.host) {
url += httpOptions.host;
} else if (httpOptions.hostname) {
url += httpOptions.hostname;
} else {
url += 'localhost';
}
if (httpOptions.port && !url.includes(':' + httpOptions.port)) {
url += ':' + httpOptions.port;
}
if (httpOptions.path) {
url += httpOptions.path;
} else {
url += '/';
}
return url;
}
/*
* Lightweight metrics probe for HTTP requests
*
* These provide:
* time: time event started
* method: HTTP method, eg. GET, POST, etc
* url: The url requested
* requestHeaders: The HTTP headers for the request
* duration: The time for the request to respond
* contentType: HTTP content-type
* statusCode: HTTP status code
*/
HttpOutboundProbe.prototype.metricsEnd = function(probeData, method, url, res, headers) {
if (probeData && probeData.timer) {
probeData.timer.stop();
am.emit('http-outbound', {
time: probeData.timer.startTimeMillis,
method: method,
url: url,
duration: probeData.timer.timeDelta,
statusCode: res.statusCode,
contentType: res.headers ? res.headers['content-type'] : undefined,
requestHeaders: headers,
});
}
};
/*
* Heavyweight request probes for HTTP outbound requests
*/
HttpOutboundProbe.prototype.requestStart = function(probeData, method, url) {
var reqType = 'http-outbound';
// Do not mark as a root request
probeData.req = request.startRequest(reqType, url, false, probeData.timer);
};
HttpOutboundProbe.prototype.requestEnd = function(probeData, method, url, res, headers) {
if (probeData && probeData.req)
probeData.req.stop({
url: url,
statusCode: res.statusCode,
contentType: res.headers ? res.headers['content-type'] : undefined,
requestHeaders: headers,
});
};
module.exports = HttpOutboundProbe;