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request-capture-har.js
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request-capture-har.js
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var fs = require('fs');
var pkg = require('./package.json');
function buildHarHeaders (headers) {
return headers ? Object.keys(headers).map(function (key) {
return {
name: key,
// header values are required to be strings
value: headers[key].toString()
};
}) : [];
}
function appendPostData (entry, request) {
if (!request.body) return;
entry.request.postData = {
mimeType: 'application/octet-stream',
text: request.body
};
}
function toMs (num) {
return Math.round(num * 1000) / 1000;
}
function HarWrapper (requestModule) {
this.requestModule = requestModule;
this.clear();
}
HarWrapper.prototype.request = function (options) {
// include detailed timing data in response object
Object.assign(options, { time: true });
var self = this;
// make call to true request module
return this.requestModule(options, function (err, incomingMessage, response) {
// create new har entry with reponse timings
if (!err) {
self.entries.push(self.buildHarEntry(incomingMessage));
}
// fire any callback provided in options, as request has ignored it
// https://github.com/request/request/blob/v2.75.0/index.js#L40
if (typeof options.callback === 'function') {
options.callback.apply(null, arguments);
}
});
};
HarWrapper.prototype.clear = function () {
this.entries = [];
this.earliestTime = new Date(2099, 1, 1);
};
HarWrapper.prototype.saveHar = function (fileName) {
var httpArchive = {
log: {
version: '1.2',
creator: {name: 'request-capture-har', version: pkg.version},
pages: [{
startedDateTime: new Date(this.earliestTime).toISOString(),
id: 'request-capture-har',
title: 'request-capture-har',
pageTimings: { }
}],
entries: this.entries
}
};
fs.writeFileSync(fileName, JSON.stringify(httpArchive, null, 2));
};
HarWrapper.prototype.buildTimings = function (entry, response) {
var startTs = response.request.startTime;
if (!startTs) return;
var endTs = startTs + response.elapsedTime;
var totalTime = endTs - startTs;
if (new Date(startTs) < this.earliestTime) {
this.earliestTime = new Date(startTs);
}
entry.startedDateTime = new Date(startTs).toISOString();
entry.time = totalTime;
// new timing data added in request 2.81.0
if (response.timingPhases) {
entry.timings = {
'blocked': toMs(response.timingPhases.wait),
'dns': toMs(response.timingPhases.dns),
'connect': toMs(response.timingPhases.tcp),
'send': 0,
'wait': toMs(response.timingPhases.firstByte),
'receive': toMs(response.timingPhases.download)
};
return;
}
var responseStartTs = response.request.response.responseStartTime;
var waitingTime = responseStartTs - startTs;
var receiveTime = endTs - responseStartTs;
entry.timings = {
send: 0,
wait: waitingTime,
receive: receiveTime
};
};
HarWrapper.prototype.buildHarEntry = function (response) {
var entry = {
request: {
method: response.request.method,
url: response.request.uri.href,
httpVersion: 'HTTP/' + response.httpVersion,
cookies: [],
headers: buildHarHeaders(response.request.headers),
queryString: [],
headersSize: -1,
bodySize: -1
},
response: {
status: response.statusCode,
statusText: response.statusMessage,
httpVersion: 'HTTP/' + response.httpVersion,
cookies: [],
headers: buildHarHeaders(response.headers),
_transferSize: response.body.length,
content: {
size: response.body.length,
mimeType: response.headers['content-type']
},
redirectURL: '',
headersSize: -1,
bodySize: -1
},
cache: {}
};
this.buildTimings(entry, response);
appendPostData(entry, response.request);
return entry;
};
module.exports = HarWrapper;