dowjones / distribucache Goto Github PK
View Code? Open in Web Editor NEWDatastore-independent automatically-repopulating cache.
License: MIT License
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Add ability to return raw values from the datastore (sans marshalling)
As a client configuring a new store,
I want to force distribucache to not marshall values,
In order to optimize for memory and cpu.
This is useful when you need to store a buffer or string and not an object (e.g., caching the html of the page). It will avoid the Buffer (Redis) -> String (Redis) -> Object (Distribucache) -> String (Express) -> Buffer (Http) conversion that currently happens with the Redis store when storing the page html in cache.
Possible configuration:
cache = cacheClient.create('page:v1', {
useRawValues: true
});populateIn does not restart after pausePopulateIn triggers
Repro:
var distribucache = require('distribucache'),
memoryStore = require('distribucache-memory-store'),
store = memoryStore(),
logEvents = require('distribucache-console-logger'),
cacheClient = distribucache.createClient(store),
cache;
cache = cacheClient.create('randomness', {
populateIn: '5 sec',
pausePopulateIn: '10 sec',
populate: function (key, cb) {
setTimeout(function () {
var value = Math.round(Math.random() * 1000);
console.log('[client] populating with:', value);
cb(null, value);
}, 250);
}
});
logEvents(cache);
function doIt() {
var t = Date.now();
cache.get('k8', function (err, value) {
if (err) return console.error('[client] ', err);
console.log('[client] got `%j` (type: %s) in %dms',
value, typeof value, Date.now() - t);
});
}
console.log('--------------- GET ------------------')
doIt();
setTimeout(function () {
console.log('------------- POPULATE -------------')
}, 5000);
setTimeout(function () {
console.log('---------- PAUSING NOW ----------')
}, 10000);
setTimeout(function () {
doIt();
setInterval(doIt, 5000);
}, 16000);Result:
--------------- GET ------------------
2016-02-09T19:45:32.991Z get:before - k8
2016-02-09T19:45:32.993Z get:after - k8,2
2016-02-09T19:45:32.994Z get:miss - k8
2016-02-09T19:45:32.994Z populate:before - k8
[client] populating with: 561
2016-02-09T19:45:33.246Z set:before - k8,561
2016-02-09T19:45:33.248Z set:after - k8,561,2
2016-02-09T19:45:33.248Z populate:after - k8,254
[client] got `561` (type: number) in 258ms
---------- POPULATE ----------
2016-02-09T19:45:38.254Z populateIn:before - k8
2016-02-09T19:45:38.256Z populate:before - k8
[client] populating with: 327
2016-02-09T19:45:38.510Z set:before - k8,327
2016-02-09T19:45:38.511Z set:after - k8,327,1
2016-02-09T19:45:38.511Z populate:after - k8,255
2016-02-09T19:45:38.511Z populateIn:after - k8,257
---------- PAUSING NOW ----------
2016-02-09T19:45:43.515Z populateIn:before - k8
2016-02-09T19:45:43.515Z populateIn:pause - k8
2016-02-09T19:45:43.516Z populateIn:after - k8,1
2016-02-09T19:45:48.995Z get:before - k8
2016-02-09T19:45:48.996Z get:after - k8,1
2016-02-09T19:45:48.996Z get:hit - k8
[client] got `327` (type: number) in 1ms
2016-02-09T19:45:53.997Z get:before - k8
2016-02-09T19:45:53.997Z get:after - k8,0
2016-02-09T19:45:53.997Z get:hit - k8
[client] got `327` (type: number) in 0ms
2016-02-09T19:45:58.998Z get:before - k8
2016-02-09T19:45:58.998Z get:after - k8,0
2016-02-09T19:45:58.998Z get:hit - k8
[client] got `327` (type: number) in 0ms
2016-02-09T19:46:04.000Z get:before - k8
2016-02-09T19:46:04.000Z get:after - k8,0
2016-02-09T19:46:04.001Z get:hit - k8
[client] got `327` (type: number) in 1ms
2016-02-09T19:46:09.007Z get:before - k8
2016-02-09T19:46:09.007Z get:after - k8,0
2016-02-09T19:46:09.007Z get:hit - k8
[client] got `327` (type: number) in 0ms
Issue:
The [client] got 327 does not change after pausePopulateIn.
Add support for populate() with their own ETag
As a client using the populate(),
I want the method to accept a new ETag, provide the ETag of the previous value,
and I want to be able to tell populate that the previous value has not changed,
So that I would not have to waste bandwidth when the data-provider is capable of working with ETags.
cache.del() should stop `populateIn`
Support Promise interface on cache methods
Also support a promise returned from populate.
unhandled error event log message
distribucache error from an unhandled error event:
PopulateError: failed to populate key "centralbanks"; cause: timed out after 30000ms
at null._onTimeout (/home/servo/node_modules/distribucache/lib/util.js:37:8)
at Timer.listOnTimeout as ontimeout
Why is this reporting an error is unhandled?
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