From fb566bdd3556fa655a3fd256c3772f0f96e428d5 Mon Sep 17 00:00:00 2001
From: Lloyd Hilaiel <lloyd@hilaiel.com>
Date: Wed, 30 Nov 2011 23:30:44 -0700
Subject: [PATCH] (loadgen) optimization - re-use assertions to generate
synthetic load without the client compute cost
---
lib/load_gen/common.js | 4 ++--
lib/load_gen/crypto.js | 41 ++++++++++++++++++++++++++++++++++-------
2 files changed, 36 insertions(+), 9 deletions(-)
diff --git a/lib/load_gen/common.js b/lib/load_gen/common.js
index 619b989dd..cd31954fb 100644
--- a/lib/load_gen/common.js
+++ b/lib/load_gen/common.js
@@ -78,8 +78,8 @@ exports.genAssertionAndVerify = function(cfg, user, ctx, email, audience, cb) {
});
wcli.post(cfg, '/verify', {}, {
- audience: audience,
- assertion: assertion
+ audience: assertion.audience,
+ assertion: assertion.assertion
}, function (r) {
try {
if (r.code !== 200) throw "non-200 status: " + resp.code;
diff --git a/lib/load_gen/crypto.js b/lib/load_gen/crypto.js
index aa4735336..e8ca1c434 100644
--- a/lib/load_gen/crypto.js
+++ b/lib/load_gen/crypto.js
@@ -27,12 +27,39 @@ exports.getKeyPair = function() {
return userDB.any(keyPairs);
};
+var assertions = [];
+
exports.getAssertion = function(obj) {
- // XXX: we can memoize here at some point, returning existing assertions
- // to reduce compute cost of loadgen client, to simulate more load
- // on servers
- var expirationDate = new Date(obj.now.getTime() + (2 * 60 * 1000));
- var tok = new jwt.JWT(null, expirationDate, obj.audience);
- var assertion = vep.bundleCertsAndAssertion([obj.cert], tok.sign(obj.secretKey));
- return assertion;
+ // we can memoize here, returning existing assertions to reduce
+ // compute cost of loadgen client, to simulate more load on servers
+
+ // this is a synthetic benchmark and for assertions we don't really care
+ // what email or RP is associated with the assertion, just that
+ // it applies load.
+
+ function genAssertion() {
+ var expirationDate = new Date(obj.now.getTime() + (2 * 60 * 1000));
+ var tok = new jwt.JWT(null, expirationDate, obj.audience);
+ var assertion = vep.bundleCertsAndAssertion([obj.cert], tok.sign(obj.secretKey));
+
+ return {
+ audience: obj.audience,
+ assertion: assertion,
+ expirationDate: expirationDate
+ };
+ }
+
+ if (assertions.length >= 30) {
+ var which = Math.floor(Math.random()*30)
+ var assertion = assertions[which];
+ // consider assertions which expire in the next minute stale
+ if ((assertion.expirationDate - new Date()) < (60 * 1000)) {
+ assertion = assertions[which] = genAssertion();
+ }
+ return assertions[which];
+ }
+
+ var a = genAssertion();
+ assertions.push(a);
+ return a;
};
--
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